Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 1
SOUTHERN REGIONAL POWER COMMITTEE BENGALURU
Agenda for the 83rd Meeting of Protection Coordination Sub-Committee of SRPC to be held on 16th May, 2019
1. Introduction
2. Confirmation of Minutes of last PCSC meeting
Confirmation of minutes of 82nd Protection Coordination Sub-Committee meeting held on 28th March 2019.
3. Grid Occurrences
3.1 Grid Disturbances (GD), Grid Incidences (GI), and trippings due to failure of Auto-
reclosing (A/R), and mal-operation of PLCC equipment that occurred during the period February – April, 2019 given at Annexure-I would be discussed in the PCSC meeting.
Constituents are requested to furnish the following information in respect of the above grid occurrences to have fruitful discussions.
(a) Single line diagram of the station with switching devices, CT, PT and relay details. (b) Cause of the tripping & Remedial Action taken (c) Relay setting details
Constituents are requested to bring/ furnish full particulars of the tripping events pertaining to their system.
3.2 In compliance of Regulations 5.2 (r) of IEGC, the Constituents are required to furnish
the following information in respect of Grid Occurrences within 24 hrs of occurrence of the same to SRLDC/ SRPC: (a) First Information Report (FIR) (b) Event Logger (EL) output (c) Disturbance Recorder (DR) output (d) Trip event analysis report (with pre and post fault system conditions) Non-furnishing of tripping details (FIR/DR/EL/TR) for the period 01.03.2019 – 25.04.2019 had been brought to Constituents’ notice vide letters (i) No. SRPC/ SE-III/ PCSC/ 2019/ 1471-83 dated 20.03.2019, (ii) No. SRPC/ SE-III/ PCSC/ 2019/ 1887-901 dated 09.04.2019 and (iii) No. SRPC/ SE-III/ PCSC/ 2019/ 2027-43 dated 23.04.2019. Non-compliance in this regard would be discussed in the meeting.
4. Submission of Reports/ Compliance by Constituents
4.1 Status of implementation of pending Protection Coordination
Sub-Committee (PCSC) Recommendations
The status of implementation of pending PCSC recommendations (up to 82nd PCSC meeting) is given at Annexure-II. The latest status on the same may please be sent latest by 03.05.2019.
Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 2
4.2 Remedial measures for "Transmission Elements under Forced Outage"
The Constituents are requested to furnish the remedial measures/ actions taken by them for the tripping events as circulated vide our emails. (Annexure-III)
The tripping events are based on the daily reports at SRLDC website http://srldc.in/Reports.aspx under the menu: Reports->Daily-> "TL under Forced Outage")
4.3 Certificate for Healthiness of Batteries
As per the MoP direction given in pursuant to recommendations of the Enquiry Committee (NEW grid disturbance on 30th & 31st July, 2012), RPC’s are required to obtain from their respective Constituents the monthly certificate for healthiness of batteries, installed at 220 KV and above voltage level Substations (for power supply to Relays, RTUs and PLCC equipment) and furnish the same to CEA/ MoP.
With reference to above, the Constituents have been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC Secretariat.
The sought status for the month of March, 2019 is awaited from the following SR-Constituents:
PED, PGCIL (SR-I), NTPC (Ramagundam), TPCIL
5. Operationalization of Data Modification Notification System (DMNS) for the States
of Southern Region
On the above subject, SRPC vide (i) letter no: SRPC/ SE-III/ PMS/ 2018/ 5124 – 146 dated 03.08.2018 & subsequent reminder mails, and (ii) letter no: SRPC/ SE-III/ PMS/ 2018/ 7242-62 dated 16.11.2018 & subsequent reminder mails had requested the Utilities of Tamil Nadu & Puducherry & Kerala & Telangana and Andhra Pradesh & Karnataka respectively to furnish the details of their Users who are responsible for calculating relay settings and/ or intimating calculated relay settings to the field to SRPC Secretariat ([email protected]) so as to create their respective DMNS Accounts. However, it is noted with concern that details in this regard are still awaited from the following Utilities:
Lanco KPL Since DMNS has already been operationalised w.e.f. 10.09.2018, it is requested from the above Utilities to kindly furnish the sought details without further delay. In this regard, it is also requested from all Utilities (including SLDC’s) of Tamil Nadu, Kerala, Telangana, Puducherry, Andhra Pradesh, and Karnataka & SRLDC to regularly use DMNS application for intimating further changes that have taken place at the stations falling under their control.
Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 3
6. Confirmation of Orderliness of Protection SLD’s for the States of Southern Region
The Protection SLD's of various Stations of the states of Tamil Nadu & Kerala & Puducherry &
Telangana & Andhra Pradesh & Karnataka (included in PMS project & visited by PRDC) prepared
by PRDC were circulated through mails for confirmation of orderliness of the same. The List of
Protection SLD’s and the status of their confirmation by utilities is attached in Annexure-IV.
It is requested from all Utilities of the states of TamilNadu & Telangana & AndhraPradesh &
Karnataka, who have not furnished the required comments, to take steps to furnish the same on
priority basis to us latest by 09.05.2019 without fail. Non-Compliance of the same will be
discussed in the meeting.
7. Training Program on Protection Database Management System (PDMS) and DMNS
Training Program on using various modules of Protection Database Management System (PDMS)
and Data Modification Notification system (DMNS) would be imparted by M/s PRDC Pvt. Ltd. to
SR-Constituents as per the following schedule:
Sl. No. Training Schedule Location Utilities
1 13.05.2019 – 14.05.2019 KPTCL HQ, Bengaluru KPCL & KPTCL
2 20.05.2019 – 21.05.2019 SRPC Secretariat,
Bengaluru
PGCIL (SR-II),
NTPC, NPCIL,
NLCIL, SRLDC &
SRPC
3 27.05.2019 – 28.05.2019 KSEBL HQ,
Trivendrum
KSEBL
4 30.05.2019 – 31.05.2019 Tstransco HQ,
Hyderabad
TSGENCO,
TSTRANSCO &
PGCIL (SR-I)
5 03.06.2019 – 04.06.2019 TNEB HQ, Chennai TANGEDCO &
TANTRANSCO &
PUDUCHERRY
6 11.06.2019 – 12.06.2019 APTRANSCO HQ,
Vijayawada
APGENCO, &
APTRANSCO
TANTRANSCO, KPTCL, TSTRANSCO, APTRANSCO and KSEBL are requested to kindly coordinate with the utilities attending training and make necessary arrangements for the training programme(with necessary paraphernalia) at their Head Quarters and as per above schedule, and cooperate with M/s PRDC Pvt. Ltd. to gain best out of their expertise. Details for creation of PDMS user account is still awaited from the following utilities:
APGENCO – Thermal, NTPC-Solar, HNPCL, Sembcorp, JSWEL, NTPC-Kayamkulam, NPCIL (MAPS)* and all private utilities
The above utilities are requested to furnish the sought details in proper format by 15th May 2019. *Note: NPCIL(MAPS) submitted the details but not in proper format.
Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 4
8. Line Differential Protection Schemes
As per MoM of 7th NPC meeting , the following details regarding Line Differential Protection (LDP) have been mentioned (para 15):
Sub-Committee on Relay/ Protection under task Force for Power System Analysis recommended the following (under para 15.1) regarding Implementation of Line Differential Protection (LDP) : “Many transmission lines are now having OPGW or separate optic fiber laid for
the communication. Where ever such facilities are available, it is recommended to
have the line differential protection as Main-1 protection with distance protection
as backup (built-in Main relay or standalone). Main-II protection shall continue
to be distance protection. For cables and composite lines, line differential
protection with built in distance backup shall be applied as Main-1 protection and
distance relay as Main-II protection. Auto reclosure shall be blocked for faults in
the cables.”
Under para 15.3, it was also mentioned that, a subgroup under National reliability Council for Electricity (NRCE) (constituted after seeking nominations from RPCs, POSOCO and CPU for preparation of reliable standards for protection system and communication system) has proposed the following in respect of LDP:
“For transmission line having voltages at 220kV and above: High speed duplicated
Main protection (Main-I & Main-II) shall be provided and at least one of them being
carrier aided non-switched four zone distance protection. The other protection may be
a phase segregated current differential (this may require digital communication) or a
carrier aided non switch distance protection. wherever OPGW or separate optic fiber
laid for the communication is available, Main-I and Main-II protection shall be the
line differential protection with distance protection as backup (built-in Main relay or
standalone ) shall be provided mandatorily as Main-I and Main-II.).”
General guidelines for implementing Line Differential Protection (valid for both existing and new
transmission lines) issued vide MoM of PCSC-59 dated 22.11.2016 are as follows:
All 220/ 230 kV transmission lines of length < 10 km
All 400 kV transmission lines of length < 50 km
All 220 kV & above dedicated transmission lines of Generators with installed
capacity > 200 MW
Critical corridors to be decided on case to case basis.
In case of existing 220 kV & above transmission lines satisfying above guidelines, LDP may
be implemented in a phased manner.
In case of new 220 kV & above transmission lines satisfying above guidelines, provision
for LDP may be made by including them in tender specification itself.
In this regard, SR utilities shared the following apprehensions regarding LDP, in meeting held on
25.04.2019 (Communication meeting) at SRPC Bengaluru:
Direct Connection between Relays:
Fibers
Tx
Rx Tx
Rx
Relay Relay
Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 5
While using the scheme of direct connection between relays through OPGW for LDP, the relays are connected directly & exclusively using two fibers Tx and Rx. In order to obtain redundancy, another set of fibers (2 in number) are used. Hence, a total of four fibers are required for Main-I protection. Similarly, another four fibers are used for Main-II protection. Consequently in this scheme single direction communication itself mandates a total of eight fibers.
Relays connected using C37.94 Interface: In order to reduce the number of OPGW fibers being used for LDP, utilities suggested the
following: One direct OPGW fiber channel separately for Main-I and Main-II relays for LDP
communication in one single direction. Hence, a total of 4 channels for communication in both direction by Main-I and Main-II at both ends.
Instead of using OPGW fiber channel as redundant communication medium, Main-I and Main-II relays at both end can be connected to MUX/SDH via C37.94 interface and can be communicated to other relay at far end station over existing fibers used for voice and data communication as shown below:
If Latency or time delay is main parameter for differential protection, (since in the
case of large distances, latency will occur) then it should be discussed with relay vendor so as to make it suitable for using C37.94 interface.
In this regard, utilities raised the following queries:
Whether C.37.94 interface alongwith MUX/ SDH can be used as the redundant
communication in LDP in place of direct OPGW and the maximum distance of line which
can be covered under LDP?
Is redundant channel mandatory for Differential Protection Relay?
Suggestions & discussions related to the above matter are invited from the utilities in the
forthcoming meeting.
9. Implementation of A/R at MAPS
The issue of implementation of Auto-reclosure on all 220kV and above transmission lines of Southern Region was discussed in TCC-30 & SRPC-31 meetings held on 24-25 February, 2017, and subsequently all Constituents furnished the detailed Action Plan for implementing A/R in their 220 kV & above voltage level transmission lines in PCSC-62 to PCSC-65 meetings.
The logics for implementation of A/R agreed upon by SR constituents and issued vide MoM of PCSC -62 (Annexure-V) clarified the following:
Normal single-shot, single-ph A/R scheme (with simultaneous opening at both ends of feeder with a dead-time of 1 sec and reclaim-time of 25 sec)
Relay
C37.94
Relay
MUX/SDH MUX/SDH
C37.94
C37.94 C37.94
fibers
Agenda for the 83rd
Meeting of PCSC scheduled to be held on 16th
May, 2019 Page 6
Time-Differentiated single-shot, single-ph A/R scheme [suitable for stations having
concerns relating to closing on to un-cleared fault, esp. Generators (Coal/ Gas/ Nuclear/ Hydro)]: “In this, after a line has been opened from both ends (generator end & grid end) on A/R operation, the grid end will be auto-reclosed as usual after the elapse of its dead-time (say, 1 sec). However, the generator end relay will check for the line voltage after elapse of an elongated dead time, say 1.5 sec [here the additional time delay of 0.5 sec, which has been included as a safety time margin, shall be chosen more than Zone-2 time delay & less than PDR time delay]. If the line voltage so sensed is healthy & normal (which implies that the fault has already been cleared), then generator end will be auto-reclosed; else 3-ph trip will be given at generator end to open the other two phase poles.”
It was also clarified that A/R implementation on lines connecting two generating stations is optional. The scheme and settings for A/R proposed by MAPS for the four feeders, 230kV MAPS – S.P.Koil-1, 230kV MAPS-S.P.Koil-2, 230kV MAPS – Echur, and 230kV MAPS –Acharapakkam is as given below: Three phase, time delayed auto reclose, Follower to other end breaker (Lead) with
voltage supervision and synch check, Live bus/Live line reclosing Auto Reclose. Dead time: 10.6 sec (600ms dead time of lead breaker+ 10s Reclaim time of lead breaker)
and Reclaim time: 10 secs. Number of shots: 1 Auto reclose will be configured in Main 1 protection for all Zone-1 single phase-earth fault
and PUTT (Ph-E) fault. For all other faults auto reclose is blocked and three phase trip will be configured.
PSAG-14 conducted at NPCIL (MAPS) on 16th December 2015 had recommended ‘lead-follow scheme’ 1-ph or 3-ph A/R at MAPS (Annexure-VI) with a dead time of 1.5 sec.
The issue (A/R settings) would be further discussed in the PCSC meeting. 10. Other Protection Issues, if any, with the permission of the Chair
11. Sending Agenda items for the PCSC meetings
As per the Guidelines of CEA/MOP, it has been decided to conduct the PCSC meetings on monthly basis. It is requested that Agenda Items for the PCSC meetings, if any, may please be sent latest by 5th working day of the month to SRPC Secretariat to compile and circulate the same so as to have fruitful discussions in the PCSC meetings.
12. Date of next PCSC meeting
It is informed that the 84th meeting of PCSC will be held on 27th June, 2019 (Thursday) from 10:30 hrs onwards in the Conference Hall of SRPC Secretariat, Bengaluru.
*****
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 1/6
Grid Occurrences - 83
For all tripping events involving failure of substation equipment, Constituents are requested to kindly furnish the SLD or equivalent pictorial representation showing (i) Location of the fault, and (ii) Bus-bar arrangement/ Configuration of feeders and other connected equipment with proper CB positions (OPEN/ CLOSE) at the time of occurrence of the fault.
I. Details of Grid Disturbances:
Sl. No.
Details of Event Date &Time Reason Remarks Category
1
Complete outage of 230kV Veeranam substation of TANTRANSCO
11-03-2019 at 00:55 Hrs
Triggering incident was Y-phase CT blast in 230kV Tirunelvelli (Abhishekpatty) – Veeranam Ckt-1. 230kV Trirunelvelli – Veeranam Ckt-1 and 2 tripped. Two faults were observed from the PMU plot. During the second fault, delayed fault clearance of 400ms was observed. As reported, other connected feeders 230kV Veeranam – Kodikur ckt-1&2 and 230kV Veeranam – Kayathar tripped on Zone -2 protection.
GD-1
2
Complete Outage of 400kV Singareni Generating Station of TSGENCO, 400kV Ramadugu SS and 400kV Medaram SS of TSTRANSCO
12-03-2019 at 17:03Hrs
During testing of Thippapur bay (New Element) at 400kV Ramadugu, all connected 6 feeders of 400kV Ramadugu got tripped due to spurious DT (Direct Trip) Receive. 400kV Medaram SS is connected only to 400kV Ramadugu SS. Hence this resulted in complete loss of supply at 400kV Medaram SS and 400kV Ramadugu SS. After the tripping of 400kV Ramadugu - Singareni 1&2, running unit#1 and 2 of 400kV Singareni Generating Station got tripped. 400kV SingareniSundilla 1&2 were hand tripped at Singareni end.
Gen Loss:1135
MW Load loss: 250 MW
GD-1
3
Complete outage of 220kV/132kV Chinakampalli Substation of APTRANSCO
25-03-2019 at 04:13Hrs
Triggering incident was failure of B-ph CT of Bus Coupler at 220kV Chinakampalli SS. Bus bar protection of Bus-1 and Bus-2 operated resulting in the tripping of all the connected elements at 220kV Chinakampalli SS. 400kV/220kV ICT#1, 2 and 3 at Cuddapah also got tripped during this event.
Load Loss: 285 MW
GD-1
4 Complete outage of 220kV Kadakola substation of KPTCL
08-04-2019 at 22:48Hrs
220kV Kadakola – Mysore ckt-1 and 2 tripped on distance protection due to B-phase to ground fault. 220kV Kadakola – Kaniyampeta and 220kV Kadakola – Chamrajnagar ckt-1 & 2 were handtripped at Kadakola end to avoid tripping due to overloading. This resulted in
Load Loss: 250 MW
GD-1
Annexure-I
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 2/6
complete loss of supply at 220kV Kadakola station
5
Complete Outage of North Kerala and 220kV Areakode SS of KSEB
10-04-2019 at 23:05Hrs
220kV Areakode SS was under split bus operation during antecedent conditions. It was intended to shift 220/110KV, 160 MVA Transformer at Areakode from bus-1 to bus-2. During shifting, both the buses got coupled through R and Y ph bus isolators. This resulted in R-Y ph bus fault and bus bar protection operated at 220kV Areakode SS resulting in the tripping all the connected elements. After the tripping of all 220kV Kozhikode Areakode lines, due to overvoltage, 400kV Kozhikode Mysore line-2 got tripped at Kozhikode end and DT was received at Mysore end.
Load Loss: 820 MW and Gen Loss: 230
MW
GD-1
6
Complete outage of 220kV Hubli substation of KPTCL and 220kV Nagjheri Power station of KPCL
10-04-2019 at 18:09Hrs
Y and B-phase earth isolator switch blades of 220kV Hubli-Bidnal ckt-1, got closed due to failure of locking mechanism during heavy wind and rain conditionsresulting in bus fault. Bus bar protection operated and all connected elements tripped. There was complete loss of supply at 220kV Hubli station since the station was on single bus operation. At thesame time, 220kV Nagjheri-Ambewadi ckt-1 and 220kV Nagjheri – Bidnal tripped on overcurrent protection. Since 220kV Nagjheri – Ambewadi ckt-2 and 220kV Nagjheri-Kodasalli ckt-1 &2 wereunder shutdown in the antecedent due to maintenance, running units #1,4,5 and 6 tripped due to loss of evacuating lines. This resulted in complete loss of supply at 220kv Nagjheri station.
Load Loss: 60 MW and gen. Loss: 450 MW
GD-1
7
Complete outage of 230kV/110kV KR Thoppur Substation of TANTRANSCO
11-04-2019 at 13:16Hrs
Triggering incident was failure of Y-ph CT of Bus Coupler at 230kV KR Thoppur(Salem) SS. Bus bar protection of Bus-1 and Bus-2 operated resulting in the tripping of all the connected elements at 230kV KR Thoppur SS. 400kV/230kV ICT#1 and 2 at Salem also got tripped during this event.
Load Loss: 24 MW
GD-1
Annexure-I
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 3/6
II. Details of Grid Incidents:
Sl. No. Details of Event Date &Time Reason Category
1 Tripping of 400kV/230kV ALAMATHY ICT-5
21-02-2019 at 11:07hrs
400/230kV ICT-5 at Alamatty tripped on WT (winding temperature) and OT (oil Temperature) trip indications due to DC leakage while changing the fan control contactor of ICT-4
GI-2
2 Tripping of 400/220 kV ICT-1 AT GAJWEL
22-02-2019 at 10:26hrs
400/220kV ICT-1 at Gajwel tripped on winding temperature relay indications while checking the winding temperature setting
GI-2
3 Tripping of 400/230 Kv ICT 2 AT THIRUVALLAM
24-02-2019 at 07:38hrs
400/230kV, ICT-2 at Tiruvallum tripped on operation of Pressure Relief Device (PRD)
GI-2
4 Tripping of 400 kV KOLAR - TIRUVALLUM
24-02-2019 at 15:18hrs
Y-phase to earth fault occurred in line. Auto-reclose was not successful at both ends as fault was persistent in nature. From Kolar end DR, it is observed that zone-2 got operated during auto-reclose attempt instead of carried aided protection.
GI-2
5 Tripping of 400KV/220KV JULURUPADU-ICT-1
25-02-2019 at 23:30hrs
400/220kV ICT-1 at Julurupadu tripped on differential protection for fault on 220kV Julurupadu-Peddagopathi-2 feeder. Suspected mal operation of the relay for through fault
GI-2
6 Tripping of 400/220 kV ICT-2 AT NEELAMANGALA
02-03-2019 at 13:54hrs
Suspected trip due to temporary DC Ground. GI-2
7 Tripping of 400KV-TALARCHEVU-JAMMALAMADUGU-2
03-03-2019 at 18:02hrs
400kV Talarichevu - Jamalamadugu ckt-2 tripped on operation of overvoltage, Stage-1 protection at Talarichevu end and DT received at Jamalamadugu end. From Talarichevu end DR, phase voltages were: Vr-114.3kV, Vy-228kV and Vb-344kV. Wide differences in phase voltages observed.
GI-2
8 Tripping of 400/230 kV ICT-2 AT SRIPERUMBUDUR
08-03-2019 at 18:01hrs
Triggering incident was failure of B-phase LV side LA of ICT#2. ICT#2 tripped on differential protection operation.
GI-2
9 Tripping of 400 kV GUTTUR - NARENDRA -1
10-03-2019 at 18:03hrs
Line tripped on operation of overvoltage stage-1 protection at Guttur end and DT received at Narendra end. Voltages at Guttur end: Vr-254kV, Vy-252kV, Vb-246kV. As per voltage grading, 400kV Guttur Narendra line-2 should trip first.
GI-2
Annexure-I
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 4/6
10 Tripping of 400kV KaigaGuttur line-2
11-03-2019 at 01:49hrs
Triggering incident was R-N fault in 400kV KaigaGuttur line-2. At Kaigaend, fault was sensed in Zone-1. But LBB of main breakerof the line operated due to struck breaker conditionof B-phresulting in tripping of all main CBs of bus-1 and DT sent. Pole discrepancy operated due to suspected non-opening of B-ph breaker. At Guttur end, fault was sensed in zone-2, carrier received and AR attempted. But during AR operation, line got tripped due to DT receive from other end.
GI-2
11 Tripping of HVDC TALCHER - KOLAR LINE 2
12-03-2019 at 13:02hrs
HVDC Talcher-Kolar Pole-2 tripped due to line fault at Talcher end. Talcher – Kolar pole-1 continued operation in ground return mode. HVDC Talcher-Kolar pole-2 had entered reduced voltage operation due to the repeated line faults, however, due to reoccurrence of the line fault the pole finally tripped.
12 Tripping of 400/220 kV ICT-2 AT Cuddapah
13-03-2019 at 09:07hrs
400/220kV, 315MVA ICT-2 at Cuddapah (Chinakampalli) tripped due to damage of control cable during excavation at 220kC APTRANSCO switchyard. 400kV side didnot trip
GI-2
13 230kV Bus dead at 230/110 kV Pugalur
14-03-2019 at 13:24 hrs
Triggering incident was R-phase breaker failure in 230kV Pugalur end of Budansandhai feeder. LBB operated resulting in tripping of all connected elements. As reported, 230kV side was on single bus operation since bus sectionalizer provision is not there. 110kV side connected feeders did not trip.
GI-1
14 Tripping of 400/110 kV ICT-4 AT SRIPERUMBUDUR
15-03-2019 at 13:25hrs
110KV SriperumpudurI.G.Kottai line tripped on Zone-1, distance protection due to B-N fault. At the same time, ICT#4 got tripped due to Bucholz relay operation.
GI-2
15 Tripping of 400kV Maradam-Kalpakka-1
15-03-2019 at 14:48hrs
Line tripped during testing of DC leakage at Maradam end.Feeder didnot trip at Kalpakka end
GI-2
16 Tripping of 400/220 kV ICT-4 AT Gajwel
21-03-2019 at 10:13hrs
400/220kV ICT-4 at Gajwel tripped on PRV tank-2 indications. Suspected maloperation due to problem with auxillary relay and its wiring
GI-2
17 Tripping of 400kV Krishnapatnam – Nellore ckt-1
23-03-2019 at 04:41 hrs
Feeder tripped due to severe tracking on line insulator stacks.
GI-2
18 Tripping of 400/230 kV ICT-1 AT SALEM
29-03-2019 at 18:14hrs
ICT tripped on winding temperature high alarm GI-2
19 Tripping of 400 kV NCTPS – Vallur- 2
30-03-2019 at 04:19hrs
Feeder tripped due to heavy tracking on line insulator stacks.
GI-2
20 Tripping of 220kV VTS-Talapalli ckt-3 and Generating Units#1,2,3,4,5 & 6 at VTS.
01-04-2019 at 22:58hrs
220kV VTS – Talapalli ckt-4 was under maintenance. While restoring the feeder, 220kV VTS – Talapalli ckt-3 tripped on Zone-1 distance protection due to B-N fault. At the same tine VTS unit# 1 & 2 tripped on Loss of fuel and Generators 3,4,5&6 tripped on Generator Negative phase sequence protection.
GI-1
21 Tripping of 400kV NP Kunta – Cuddapah ckt-2
03-04-2019 at 00:44hrs
Feeder tripped on operation Gas Zone protection at CuddapahGIS end due heavy gas
GI-2
Annexure-I
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 5/6
leak from B-phase circuit breaker and direct trip received at NP Kunta end.
22 Tripping of HVDC TALCHER - KOLAR Pole-1
11-04-2019 at 13:01hrs
Pole-1 tripped on generation of external protection trip due to failure of control card (AVR/ACR) of Charger-1. Due to failure of the control cards there was power supply fault in both VBE (Valve Based Electronics) Systems.
GI-2
III. Details of Trippings due to Failure or Non-operation of Auto-Reclose:
Sl. No. Element Date & Time Reason
1 Tripping of 220 kV Kayamkulam –Punnapura-2
24-02-2019 at 03:05hrs
Line tripped on B-phase to earth fault. Auto-reclose was successful at Punnapura. A/r was not attempted at Kayamkulam and there was pole discrepancy operation resulting in tripping of R and Y pole of CB.
2 Tripping of 220 kV Kayamkulam –Punnapura-2
05-03-2019 at 00:30hrs
220kV Kayamkulam-Punnapura -2 tripped on Zone-1 distance protection due to R-N fault. Auto reclose operated and successful at Punnapara end but didnot operate at Kayamkulam end.
3 Tripping of 400kV Khammam-Kalpakka ckt-1
06-03-2019 at 14:18hrs
400kV Khammam-Kalpakka ckt-1 tripped on Zone-1, distance protection due to Y-N fault. AR was successful at Khamman end but didnot operate at Kalpakka end due to carrier failure. Volatges at Kalpakka end raised and overvoltage Stage-1 operated at Kalpakka end and DT was sent to Khammam end. From DR of Kalpakka end voltages are: Vr-252kV, Vy-253kV and Vb-253kV.
4 Tripping of 400 kV Neyveli TS 2- Salem 2
07-03-2019 at 12:38hrs
400kv Neyvelli TS2 - salem ckt-2 tripped on R-N fault due to insulator decapping. At Neyvelli TS2 end, autoreclose was initiated by Main-1 (7SA52) relay but Main-2 (Micom P444) relay issued a three phase trip command due to mistake in wiring. At Salem end, auto reclose operated and locked out
5 Tripping of 400kV VTPS-Suryapet-2
14-03-2019 at 13:52hrs
Line tripped on distance protection due to R-N fault. At VTPS-IV end, auto reclose didnot operate. As reported, newly retrofitted SIEMENS make relay initiated three phase trip.Auto reclose operated and successful at Suryapet end
6 Tripping of 400kV Julurpadu - Manuguru line-2
14-Mar-2019 06:10:00
Triggering incident was R-ph fault in the line. At Julurpadu end, fault was sensed in Zone-2 and carrier was received but due to DT Receive from manuguru end, A/r not operated and line got tripped. FIR, DR and EL of Manuguru end are not available.
7 Tripping of 400kV Khammam Kalpaka line-2
15-03-2019 at 12:24hrs
There was R-N fault in the line. Auto reclose operation was successful at Khammam end and due to failure of PLCC at Kalpaka end, auto reclose not operated at Kalpaka end and line tripped on Zone-1 DPR at Kalpaka end.
8 Tripping of 400 kV VTPS - Nellore
24-03-2019 at 12:46hrs
Feeder tripped on Y -N Fault. Auto reclose operated at Nellore end but not operated at VTPS end.
Annexure-I
Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 6/6
9 Tripping of 230kV Neyveli – Villianoor
28-03-2019 at 06:37hrs
Feeder tripped on Zone-1 distance protection due to B-N fault. Auto reclose didnot operate at Neyvelli end. Auto reclose operated and successful at Villianur end.
10 Tripping of 400 kV RTPS - Raichur PG ckt-2
03-04-2019 at 19:37hrs
B-N fault in line. Auto reclose successful at RTPS end but did not operate at Raichur PG end and the breaker tripped.
11 Tripping of 400KV Suryapet – Kethireddipalli -1
07-04-2019 at 16:53hrs
R-N fault in the feeder. A/R operated and successful at Suryapet end but did not operate at Kethyreddipalli end. OVR stage-1 operated at Kethyreddipalli end and DT received at Suryapet end.
IV. Details of Trippings due to PLCC mal-operation:
Sl. No. Element Date & Time Reason
1 Tripping of 400kV Hiriyur
Neelamangala-1 08-03-2019 at 09:57hrs
Line tripped at Neelamangala end only due to receipt of direct trip and line was holding from Hiriyur end. Suspected PLCC mal-operation had caused the tripping.
2 Tripping of 400kV Kundara -
Kayamkulam ckt-1 09-03-2019 at 12:44hrs
220kV Kundara - Kayamkulam ckt-1 tripped on DT received at Kayamkulam end. Kundara end didnot trip. No fault observed from the DR. Suspected PLCC maloperation.
3 Tripping of 400kV Maradam-
Kalpakka-2 11-03-2019 at 16:49hrs
Line tripped at Kalpakka end only due to receipt of direct trip and line was holding from Maradam end. Suspected PLCC mal-operation had caused the tripping.
4 Tripping of 400kV Khammam -
Kalpakka ckt-1 19-03-2019 at 17:34hrs
Line tripped due to maloperation of PLCC channel. Spurious direct trips were received at Kalpakka end from the other end, as a result voltage at Kalpakka end increased.Overvoltage stage-1 protection operated at Kalpakka end and DT sent to Khammam end
5 Tripping of 400 kV Raichur -
Munirabad 10-04-2019 at 15:52hrs
During handtripping of 400kV Raichur-Veltoor-1, DT was sent spuriously to Munirabad end from RTPS end. Feeder did not trip at Raichur end.
6 Tripping of 400 kV Kurnool -
Srisailam 11-04-2019 at 14:28hrs
Feeder tripped on DT receipt indicatins at both ends. Suspected PLCC maloperation.
Annexure-I
Meeting
No /
Index
Details of Event Date & Time Reason PCSC Recommendations Utility responsible for
Implementation
Status of Implementation of PCSC Recommendations Remarks Latest Status
(To be filled up by the Constituent)
47/I/2 Complete outage of
Krishnapatnam TPS
08-09-2015
at 18:20 hrs
Status of Pending Implementation of PCSC Recommendations as on 26.04.2019 (up to 82th Meeting)
KPTCL Mail dated 27-05-2015:
1. KPTCL has taken action to provide bus bar protection to 220kV buses. --- Pending
2. Over current relay Settings of ICTs to be reviewed by PGCIL.
--- Pending
3. --- Pending
KPTCL Mail dated 29-07-2015:
1. Initial Tendering stage. --- Pending
2. --- Pending
3. --- Pending
KPTCL Mail dated on 23-01-2016:
1. Detailed estimate prepared for taking up the work. CEE, Transmission Zone, Gulbarga will
take up necessary procurement and further execution. --- Pending
2. --- Pending with PGCIL (SR-I).
3. --- Pending
PGCIL (SR-I) Mail dated 14.07.2016:
2. Relay settings of all the stations in SRTS-1 were derived as per Ramakrishna Commettee
recomendations and implemented" --- Completed.
KPTCL Mail dated 16.12.2017:
1) & 3). DPR is approved. Tender is to be called by CEE,TZ Kalaburgi --- Pending
Review Meeting dated 19.12.2017:
1. KPTCL informed that Tenders for providing BBP would be called in Jan-Feb, 2018; Supply of
the same is targeted by September, 2018; Erection & Commissioning is targeted by January,
2019
--- Pending
3. PGCIL (SR-I) informed that time-synchronization of 220 kV side is in place. --- Completed.
KPTCL mail dated 19.12.2018:
1. DPR preapared for the work of providing Bus Bar Protection to 220kV buses at Guddadahally
is approved. Tender is to be invited by CEE,TZ .
Review Meeting dated 20.12.2018:
1. Tender would be floated in January 2019. Works would be completed in 6 months after
awarding PO.
16-07-2014
APGENCO letter dated 18.03.2016:
1.SOE and SLD are attached. The DR of 405 CB is not generated during the incident. Now the
problem is identified and rectified.
--------- Completed
2.All the 3 lines i.e CHTR-2, MNBL-I & II tripped in zone
protection. The fault was in Blind zone i.e P2 side of CT, where it was covered under Bus fault
by the time fault moved on to P1 side when the fault comes under STUB/TEED zone after
330msec all the feeders expect CHTR-1 tripped in Zone-II and total fault persisted for 500msec
before the 405 TIE CB opens and clear the fault. As a remedial the STUB protection operation
also checked and found OK.------- Completed
3.The Time Sync was missed on the day and found there was problem with LAN Timer same
was rectified. Now found OK.
-----------Completed
4.Now the DR Time scale changed to 1 sec for Pre fault and 3 sec for Post fault and STATE of
events are corrected wherever found wrong/or misguiding during analysis.---------Completed.
PGCIL-SR1 RVMD 27-04-2016:
5. Procurement of differential protection for 400kV NPS-NLR D/C and 400kV RCR-RTPS-D/C is
under tendering.
PGCIL-SR1 RVMD 14-07-2016:
5. The proposal for procurement of Line differential Protections for 400kV Raichur - RTPS-1 & 2
and 400kV Nellore - NPS - 1 & 2 lines has been approved and tender is under technical
evaluation
PGCIL (SR-I) Mail dated 15.12.2017:
PGCIL: On 23.11.2017 LDP relays commissioned in place of Main-1 distance relay in 400kV NPS-
Nellore line-2 & In line-1 installation of LDP relay is planned in Dec-2017/Jan-2018.
Review Meeting dated 19.12.2017:
5. PGCIL (SR-I) informed that LDP commissioning on both lines would be completed by
February, 2018. In this regard, PCSC made it clear that the recommendation pertains to
providing LDP as both Main-I & Main-II on both the lines, and asked PGCIL (SR-I) to ensure &
comply with the same.
34/I/6 400/220 kV ICT-1 & 2 at
Munirabad
As reported directional over current relay of ICT’s operated
due to snapping of line jumper in 220kV Lingapur line.
1. Bus bar protection shall be provided by asset owner ( i.e
KPTCL).
2. Settings for main distance protection & Overcurrent
protection shall be examined and reviewed.
3. Time synchronization of the Substation shall be ensured.
KPTCL/
PGCIL (SR-I)
Pending
(with KPTCL)
Multi-Utilities
As per FIR submitted, CT damage observed in Chitoor-Main
bay (404). Main breakers connected to bus-1 (401, 404, 407,
410) got tripped on operation of bus bar protection. Unit-1
tripped on operation of MFT. Unit-2 was not in service
1. APGENCO to furnish to PCSC forum (i) A3-size Single Line
Diagram of SDSTPS, and (ii) the sequence of events with time
stamp showing the protection that opened Tie-CB (405) at
SDSTPS.
2. APGENCO to review STUB/TEED protection in all dias at
SDSTPS and ensure that they are configured for
instantaneous operation.
3. APGENCO to properly configure the STATE of the tripping
events so that they get recorded appropriately like TRIP/
OPERATED in their corresponding Event Loggers.
4. APGENCO to ensure time sync of all DR’s and EL’s at
SDSTPS.
5. PGCIL (SR-I) to provide line differential protection for 400
kV NPS –Nellore-PG lines 1 & 2.
APGENCO/
PGCIL (SR-I)
Pending
[with
PGCIL (SR-I)]
Annexure-II
Page 1 of 36
PGCIL (SR-I) mail dated 20.06.2018:
PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are invited
from bidders & tender floated. Technical bid opening in this week.
PGCIL (SR-I) mail dated 10.12.2018:
PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays is schdule for for January,
2019 and commissioning is targed to be completed by March, 2019.
PGCIL (SR-I) mail received on 27-04-2016:
1. The firmware of REL670 is being upgraded. ------- Completed.
2. The recording of events in msec interval is being taken up with OEM. Henceforth, for analysis
purpose, we will provide larm list which has msec time stamp. -------- Completed.
3. End to end testing of PLCC code transmision and tuning of channels carried out. -------
Completed.
4. Procurement of differential protection for 400kV NPS-NLR D/C and 400kV RCR-RTPS-D/C is
under tendering. The legends modified in Event/alarm list. Provision of diff. relay for all short
lines emanating from NPS is being taken up with our corporate.
----- Pending.
PGCIL(SR-I) RVMD 14-07-2016:
4. The proposal for procurement of Line differential Protections for 400kV Raichur - RTPS-1 & 2
and 400kV Nellore - NPS - 1 & 2 lines has been approved and tender is under technical
evaluation --- Pending
PGCIL (SR-I) Mail dated 15.12.2017:
4. LDP relays procurement is under process. Procurement will be completed by Feb-2018. TPCIL
has to give written confirmation for LDP relay procurement. For want of written confirmation
from TPCIL, PGCIL approving authority has withheld the LDP proposal.
Review Meeting dated 19.12.2017:
4. PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete
procurement of LDP relays. To this, PCSC forum asked TPCIL to submit written confirmation to
PGCIL (SR-I) by 29.12.2017. PGCIL (SR-I) assured that with receipt of above confirmation from
TPCIL by Dec, 2017, they would be able to complete the work by FEbruary, 2018.
APTRANSCO informed that they would be able to implement LDP from their & APGENCO side
by April, 2018.
In this regard, PCSC forum made it clear that the recommendation is about providing LDP as
both Main-I & Main-II relays on all stated lines in Nellore Complex, ans asked all stakeholders to
ensure & comply with the same.
PGCIL (SR-I) mail dated 20.06.2018:
PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are invited
from bidders & tender floated. Technical bid opening in this week.
PGCIL (SR-I) mail dated 10.12.2018:
PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by
Jan'2019 and commissioning by Mar'19
Complete outage of TPCIL power
station
PendingRunning units at Thermal Powertech power Station tripped
due to tripping of 400kV Nellore pooling station (NPS)-TPCIL
line and 400kV Nellore pooling station (NPS)-NCC line
47/I/2 Complete outage of
Krishnapatnam TPS
08-09-2015
at 18:20 hrs
PGCIL (SR-I),
MEPL, SEL, TPCIL, NCC
1.PGCIL (SR-I) to furnish Action Taken Report on the findings
of OEM on relay mal-operation at NPS end on 400 kV NPS –
NCC line to PCSC forum.
2. PGCIL (SR-I) to appropriately configure Station Event
Logger at NPS to record events at msec interval.
3. PGCIL (SR-I) to carry out PLCC end-to-end testing in
coordination with TPCIL for 400 kV NPS –TPCIL line.
4.PGCIL (SR-I), MEPL, SEL, TPCIL & NCC to take steps to
provide line differential protection at their respective ends
on all 400 kV lines (except Gooty line) emanating from
Nellore Pooling Station, and furnish an action plan to
implement the same.
As per FIR submitted, CT damage observed in Chitoor-Main
bay (404). Main breakers connected to bus-1 (401, 404, 407,
410) got tripped on operation of bus bar protection. Unit-1
tripped on operation of MFT. Unit-2 was not in service
1. APGENCO to furnish to PCSC forum (i) A3-size Single Line
Diagram of SDSTPS, and (ii) the sequence of events with time
stamp showing the protection that opened Tie-CB (405) at
SDSTPS.
2. APGENCO to review STUB/TEED protection in all dias at
SDSTPS and ensure that they are configured for
instantaneous operation.
3. APGENCO to properly configure the STATE of the tripping
events so that they get recorded appropriately like TRIP/
OPERATED in their corresponding Event Loggers.
4. APGENCO to ensure time sync of all DR’s and EL’s at
SDSTPS.
5. PGCIL (SR-I) to provide line differential protection for 400
kV NPS –Nellore-PG lines 1 & 2.
APGENCO/
PGCIL (SR-I)
Pending
[with
PGCIL (SR-I)]
30-12-2015 at
06:02hrs
50/I/2
Annexure-II
Page 2 of 36
APTRANSCO mail dated on 31-08-2016:
To avoid the unwanted malopeartions due to the external LBB trip initiation from PGCIL, Vide
letter Dt: 04-08-2016, APTRANSCO has requsted the PGCIL to arrange the Master trip relay and
breaker contacts of ICT-1 &2 LV side to enable the internal LBB feature in the Busbar protection
scheme at 220kV Gooty Switching station. Waiting for the PGCIL response.
APTRANSCO mail dated on 15-11-2016:
To avoid the unwanted maloperations due to the external LBB trip initiation from PGCIL, vide
letter Dt: 04-08-2016, ARTRANSCO has requested the PGCIL to arrange the Master trip relay
and breaker contacts of ICT-1&2 LV side to enable the internal LBB feature in the Busbar
protection scheme at 220kV Gooty Switching station. Waiting for the PGCIL response.
APTRANSCO mail dated on 20-12-2016:
Waiting for the PGCIL response.
APTRANSCO mail dated 04.03.2017 & 24.05.2017.
SRPC is requested to coordinate with PGCIL in takind necessary action.
APTRANSCO mail dated 20.09.2017 & 22.11.2017
PGCIL may be requested to take necessary actionAPTRANSCO maild ated 15.12.2017:
1. Cable healthiness checked and found ok. But it is proposed to replace the cable with
armored cable. --Completed
2. After replacing the cable contactors will be removed so as to avoid unwarrented delays in
transmitting trigging signal to the central unit . ---Pending
Review Meeting dated 19.12.2017:
APTRANSCO informed that replacement of the existing cable with armoured cable and
subsequent removal of cable contactors would be completed by 31.12.2017. In this regard,
PGCIL (SR-I) also assured that they would render all required help from their side to complete
the stated works in time.
APTRANSCO Mail Dated 30.01.2018:
New armoured cable is laid from 220 kv Gooty (AP) to 400/220 kv Gooty (PGCIL) for replacing
the existing cable connected to ICT-2.PGCIL is requested to provide spare contacts from trip
relays of 315 mva LV-1 and LV-2 for providing internal CB failure in busbar protection scheme.
APTRANSCO Mail Dated 24.04.2018 & 24.05.2018:
As requested by PGCIL the busbar drawings Were submitted for providing spare contacts from
trip relays of 315 mva LV-1 and LV-2 for providing LBB in busbar protection scheme.
PGCIL (SR-I) mail dated 20.06.2018:
220kV CB LBB protection (Stand alone protection) available at PGCIL end is to protect ICT in
case of non tripping of CB. It is opined that stand alone protection is better than new LBB logic
proposed by APTRANSCO in Busbar schme. The reason for mal-operation of 220kV Bus on
24.06.2016 is mainly due to cable issue. The problem shall be solved once we replace, this
suspected cable betweem POWERGRID & APTRANSCO.
APTRANSCO Mail Dated 18.12.2018:
PGCIL was requested to arrange LC & coordinate for completeing the work.
PGCIL (SR-I) mail dated 10.12.2018:
220kV CB LBB protection (Stand alone protection) available at PGCIL end is to protect ICT in
case of non tripping of CB. It is opined that stand alone protection is better than new LBB logic
proposed by APTRANSCO in Busbar schme. The reason for mal-operation of 220kV Bus on
24.06.2016 is mainly due to cable issue. The problem shall be solved once APTRANSCO replaces
suspected cable, this suspected cable betweem POWERGRID & APTRANSCO.
In this regard a letter dtd 22.09.2018 hasbeen sent to EE, MRT & T/F, Ananthapur, AP TRANSCO
that the required relay contact will not provided by POWERGRID.
Review Meeting held on 20.12.2018:
Cable laying work was completed by PGCIL (SR-I). It was agreed that the work would be
completed by PGCIL (SR-I), in cordination with APTRANSCO, within one month.
APTRANSCO MAIL DATED 22.01.2019:
Pending [ with PGCIL (SR-I) ]
Tripping at 220 kV Gooty
Substation of APTRANSCO
56/II/13 APTRANSCO/
PGCIL (SR-I)
1.APTRANSCO to check the healthiness of the connecting
cable between Gooty (PGCIL) and Gooty (APTRANSCO), and
replace it, if required.
2.APTRANSCO to ensure that the distributed architecture
employed in implementing busbar protection at their Gooty
220 kV SS does not introduce any unwarranted delays in
transmitting the triggering signals to the Central Unit.
LBB protection got operated for 400/220kV ICT-2 breaker
which had resulted in tripping of 220kV Bus-2 at 220kV Gooty
Substation
Pending [ with PGCIL
(SR-I) ]
24-06-2016 at 16:04
hrs
Annexure-II
Page 3 of 36
APTRANSCO Mail Dated 24.04.2018:
ABB make LDP relays inspection is completed. SNEIDER make LDP relays inspection yet to be
completed. Delivery of relays expected in the 1st weak of May-2018.
APTRANSCO Mail Dated 24.05.2018:
SNEIDER make LDP relays inspection yet to be completed.Delivery of relays expected in the
month of june 2018.
PGCIL (SR-I) mail dated 20.06.2018:
PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are invited
from bidders & tender floated. Technical bid opening in this week.
APTRANSCO Mail Dated 26.06.2018:
ABB make LDP relays are delivered. Schneider make LDP relays inspection to be offered by the
company.
APTRANSCO Mail Dated 25.07.2018:
schneider LDP relays inspection yet to be offered by the company.
APTRANSCO Mail Dated 25.09.2018:
ABB make LDP relays for Main-1 protection were delivered earlier and schneider make LDP
relays for Main-2 protection are delivered in this week.
APTRANSCO Mail Dated 18.12.2018:
ABB & SCHNEIDER Relays are drawn and available at site. To be commissioned in coordination
with the Alstom (Area) engineers who implemented SAS.
PGCIL (SR-I) mail dated 10.12.2018:
PGCIL(SR-1): PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be
completed by Jan'2019 and commissioning by Mar'19
APTRANSCO MAIL DATED 22.01.2019:
The relays are yet to be commissioned.
APTRANSCO mail dated 15.03.2019:
Commissioning of LDP relays scheduled in the month of April 2019.
64/I/1 Complete outage of North
Chennai TPS STG-2
24-04-2017
at 21:02hrs
Tripping of evacuating lines due to fault led to tripping of
Units
APTRANSCO mail dated on 20-12-2016:
Issue was addressed to the concerned for necessary action.
APTRANSCO mail dated on 24-05-2017:
Meeting was conducted and the relays procurement for all the loctions is under progress.
APTRANSCO mail dated on 20-10-2017 & 22.11.2017:
Relays procurement for all the locations is under progress.
APTRANSCO Mail dated 15.12.2017:
Technical bids opened. PQ evaluation under progress . Price bids expected to open in next
week.
PGCIL (SR-I) Mail dated 15.12.2017:
LDP relays procurement is under process. Procurement will be completed by Feb-2018. TPCIL
has to give written confirmation for LDP relay procurement. For want of written confirmation
from TPCIL, PGCIL approving authority has withheld the LDP proposal.
Review Meeting dated 19.12.2017:
PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete
procurement of LDP relays. To this, PCSC forum asked TPCIL to submit written confirmation to
PGCIL (SR-I) by 29.12.2017. PGCIL (SR-I) assured that with receipt of above confirmation from
TPCIL by Dec, 2017, they would be able to complete the work by FEbruary, 2018.
APTRANSCO informed that they would be able to implement LDP from their & APGENCO side
by April, 2018.
In this regard, PCSC forum made it clear that the recommendation is about providing LDP as
both Main-I & Main-II relays on all stated lines in Nellore Complex, ans asked all stakeholders to
ensure & comply with the same.
APTRANSCO MAIL DATED 30.01.2018
Technical & financial bids are opened. Tenders will be awarded shortly.
Triggering incident was snapping of Y phase conductor in
400kV Nellore (PG) - NPS line-1. Distance relay at
Krishnapatnam end over-reached in Zone-1, and resulted in
tripping of 400kV Krishnapatnam – Nellore (AP) lines - 1&2
from Krishnapatnam end. Distance relay at MEPL over-
reached and resulted in tripping of MEPL-NPS line from MEPL
end.
PGCIL (SR-I), TPCIL, MEPL, SEL, SGPL, APTRANSCO, APGENCO
and SDSTPS to implement line differential protection on all
400 kV transmission lines (of length less than 50 km)
emanating from Nellore PS, Nellore (PG) SS, and Nellore (AP)
SS. [It may be noted here that the cut-off length of 50 km has
been specified with a view to exclude only long transmission
lines].
APGENCO/
PGCIL(SR-I)/
TPCIL/MEPL/SEL/
SGPL/ APTRANSCO
Pending
[with TANTRANSCO]
Status received vide TANTRANSCO mail dated 15-06-2017 & 04.08.2017 & 18.09.2017 & 12-12-
2017:
1. All the Porcelain insulators of 400kV NCTPS-II - Vallur feeders-1&2 were replaced with
Polymer insulators by 20.05.2017. -----Completed
2. Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner.
--- Pending
PGCIL (SR-II) Mail dated 11-12-2017:
Pertaining to POWERGRID all the porceleing insulators in the polluted streches has been
completed. - Completed.
Review Meeting dated 19.12.2017:
TANTRANSCO informed that a total of 597 insulators ahd alreeady been replaced, and the total
replacement would take another 9-month period.
In this regard, TANTRANSCO was asked to furnish detailed plan of action regarding replacement
of insulators on all 400 kV lines owned by them in Chennai area.
TANTRANSCO MAIL DATED 25.01.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018. Detailed plan of action will be submitted.
TANTRANSCO MAIL DATED 29.08.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018.
Pending
TANTRANSCO and PGCIL (SR-II) to take steps to complete
insulator replacement works on the 400 kV lines owned by
them in Chennai area within 3 months.
TANTRANSCO/
PGCIL(SR-II)
18-07-2016
at 19:05 hrs
57/II/9 Tripping of 400 kV Nellore (PG) -
NPS line-1, 400 kV
Krishnapatnam-Nellore (AP)
lines -1&2 and 400kV NPS -
MEPL line
Annexure-II
Page 4 of 36
64/I/2 Complete outage of North
Chennai TPS STG-2
25-04-2017
at 18:27hrs
Tripping of evacuating lines due to fault led to tripping of
Unit
64/I/3 Complete outage of North
Chennai TPS STG-2
26-03-2017
at 21:09 hrs
Tripping of evacuating lines due to fault led to tripping of
running Unit at NCTPS Stg-2
TANTRANSCO MAIL DATED 22.05.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018. Detailed plan of action will be submitted.
TANTRANSCO MAIL DATED 08.06.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018. Detailed plan of action will be submitted.
TANTRANSCO MAIL DATED 23.07.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018.
TANTRANSCO MAIL DATED 11.09.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Dec-2018.
TANTRANSCO MAIL DATED 11.12.2018:
1.Replacement of porcelain insulators with Polymer insulator for 4 Km radius from NCTPS.2 in
400kV SVCM & Alamathy feeders were completed.
2. Further, Procurement under progress for replacement of 230kV and 110 kV porcelain
insulators with Polymer insulator in coastel area.Time line . June 2019.
TANTRANSCO MAIL DATED 23.01.2019:
Time Line requested upto June 2019
TANTRANSCO MAIL DATED 19.03.2019:
Replacement of porcelain insulators with Polymer insulator for 4 Km radius ( in Chennai area)
from NCTPS.2 in 400kV SVCM & Alamathy feeders were completed.
Pending
[with TANTRANSCO]
Status received vide TANTRANSCO mail dated 15-06-2017 & 04.08.2017 & 18.09.2017 & 12-12-
2017:
1. All the Porcelain insulators of 400kV NCTPS-II - Vallur feeders-1&2 were replaced with
Polymer insulators by 20.05.2017. -----Completed
2. Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner.
--- Pending
PGCIL (SR-II) Mail dated 11-12-2017:
Pertaining to POWERGRID all the porceleing insulators in the polluted streches has been
completed. - Completed.
Review Meeting dated 19.12.2017:
TANTRANSCO informed that a total of 597 insulators ahd alreeady been replaced, and the total
replacement would take another 9-month period.
In this regard, TANTRANSCO was asked to furnish detailed plan of action regarding replacement
of insulators on all 400 kV lines owned by them in Chennai area.
TANTRANSCO MAIL DATED 25.01.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018. Detailed plan of action will be submitted.
TANTRANSCO MAIL DATED 29.08.2018:
Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer
insulators in a phased manner. Timeline: Sep-2018.
TANTRANSCO and PGCIL (SR-II) to take steps to complete
insulator replacement works on the 400 kV lines owned by
them in Chennai area within 3 months.
TANTRANSCO/
PGCIL(SR-II)
Annexure-II
Page 5 of 36
NTPC mail dated 07.12.2017:
1. High set DEFR on 220 KV lines is disabled ----Completed
2. ---- Pending
Review Meeting dated 19.12.2017:
TSTRANSCO informed that the works are under progress, and are targeted to be completed in 3
months time.
TSTRANSCO MAIL DATED 20.01.2018:
Line Differential Protection will be provided within 3 months i.e., by end of March, 2018.
TSTRANSCO MAIL DATED 20.04.2018:
Line Differential Protection relays are under procurement and will be provided by end of May,
2018.
TSTRANSCO MAIL DATED 17.05.2018:
Line Differential relays will be supplied to site by manufacturer by end of May, 2018 and
erection will be completed by end of June, 2018.
TSTRANSCO MAIL DATED 12.10.2018:
Inspection of the relays is completed and the relays are received at stores. Relays are to be
drawn and commissioned. Work is expected to be completed by end of December 2018.
TSTRANSCO MAIL DATED 22.01.2019:
Relays will be commissioned by end of February, 2019.
66/ II/ 10 Tripping of 400/ 220 kV ICT’s – 3
& 4 at Ramagundam STPS
NTPC-Ramagundam/
TSTRANSCO
PendingTriggering incident was failure of 220 kV
B-phase LA in ICT-3 LV extension feeder (220KV line-2) at
Malayalapalli substation
1. NTPC to disable high-set of DEFR on the 220 kV lines
emanating from their Ramagundam STPS.
2. NTPC/ TSTRANSCO to provide Line Differential Protection
(with or without pilot) on 220 kV Ramagundam –
Malayalapalli lines – 1 & 2 & 3.
11-06-2017
at 19:46hrs
Annexure-II
Page 6 of 36
69/I/2 Complete outage of 400kV TPCIL
station
30-10-2017 at 21:37
hrs
400kV TPCIL - Nellore line-1 got tripped at TPCIL end during
failure of LA of Station Transformer-2 at TPCIL. Running Units
at TPCIL got tripped due to loss of evacuating line. 400kV
TPCIL - Nellore PS line-2 was under emergency shutdown
1. TPCIL to configure DEF protection such that it remains in
blocked condition as long as Distance Protection is active,
and becomes active only when distance protection does not
pickup.
2.PGCIL (SR-I) to ensure healthiness of Carrier
communication, and the set PUP mode of carrier aided
scheme operates reliably on TPCIL lines 1 & 2.
TPCIL/
PGCIL (SR-I)
Review Meeting dated 19.12.2017:
PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete
procurement of LDP relays. To this, PCSC forum asked TPCIL to submit written confirmation to
PGCIL (SR-I) by 29.12.2017. PGCIL (SR-I) assured that with receipt of above confirmation from
TPCIL by Dec, 2017, they would be able to complete the work by February, 2018.
APTRANSCO informed that they would be able to implement LDP from their & APGENCO side
by April, 2018.
In this regard, PCSC forum made it clear that the recommendation is about providing LDP as
both Main-I & Main-II relays on all stated lines in Nellore Complex, ans asked all stakeholders to
ensure & comply with the same.
PGCIL (SR-I) mail dated 20.06.2018:
2. PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are
invited from bidders & tender floated. Technical bid opening in this week.
PGCIL (SR-I) mail dated 10.12.2018:
2. PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by
Jan'2019 and commissioning by Mar'19.
Review Meeting on 20.12.2018:
1. It was noted that TPCIL representatives have not attended the meting. TPCIL wasked to
furnish implementation status of the given recommendation at the earliest.
Pending
APTRANSCO maild ated 30.01.2018:
1. Pending...
2.A/R scheme on 400kV Kurnool (PGCIL) feeder-2 will be checked after getting LC.
APTRANSCO maild ated 24.04.2018 & 24.05.2018 & 26.06.2018:
1. Pending...
2. B Ph auxilary trip relay is found defective. The same is to be replaced by M/S PGCIL. Ii) PD
relay event is configured in the EL as per the recommendation.
PGCIL (SR-I) mail dated 20.06.2018:
1. ---Pending
2. PGCIl(SR-1): B-Ph auxiliary relay problem rectified at Narnoor end by replacing relay contact. -
--Completed
APTRANSCO Mail Dated 25.07.2018:
Lines and Bays pertain to PGCILAPTRANSCO Mail Dated 18.12.2018:
1) Bays and lines pertains to PGCIL .
2) ---Completed.
PGCIL (SR-I) mail dated 20.12.2018:
1) PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by
Jan'2019.
APTRANSCO MAIL DATED 22.01.2019:
Pending [with PGCIL (SR-I)]
APTRANSCO maild ated 15.12.2017:
APTRANSCO would extend support and requirements if any ,for the rectification proposed by
KPTCL.
Review Meeting dated 19.12.2017:
It was noted that the original Gooty - Lingapur line got LILOed at BTPS, Alipura, and
Ragulapadu. It was also noted that Phase Discrepancy is being observed in Ragulapadu - Alipira
section only. When enquired about the same, KPTCL informed that they would examine the
issue in detail, and would inform the action lan proposed by next PCSC-71 meeting. On this,
APTRANSCO was also asked to render all help required from their side to KPTCL.
APTRANSCO maild dated 30.01.2018:
APTransco world extend required support .
APTRANSCO maild dated 24.04.2018 & 24.05.2018 & 26.06.2018:
AP Transco would extend required support for attending, phase discrepancy issue in ragulapadu-
Alipura line by KPTCL.
APTRANSCO Mail Dated 25.07.2018:
To be attended by KPTCL as discussed in 75th PCSC meeting.
KPTCL mail dated 19.12.2018:
Phase mis match issue is to be sorted out jointly by KPTCL/ APTRANSCO/ KPCL.
Review Meeting on 20.12.2018:
PCSC forum decided that concrete action in this respect to be initiated in 2 months by KPTCL
alongwith APTRANSCO.
APTRANSCO MAIL DATED 22.01.2019:
Pending [with KPTCL ]
APTRANSCO/
PGCIL (SR-I)
Tripping of 400 kV Kurnool(PG) –
Kurnool(AP) line-2
02-10-2017 at 02:03
hrs
1) PGCIL (SR-I) and APTRANSCO to provide for Line
Differential Protection as both the Main protections on 400
kV Kurnool (AP) – Kurnool (PG) lines 1 & 2 lines.
2) APTRANSCO to furnish an action taken report w.r.t.
resolving A/R non-operation at Kurnool-AP end for the
subject trippings and configure EL for capturing PDR
operation at their 400 kV Kurnool-AP SS.
Line tripped on B-ph to ground fault. A/R was unsuccessful at
both Kurnool (AP) and Kurnool (PG) ends.
Line tripped on B-Ph to earth fault. A/R was successful at
Regulapadu and breakers at Alipura end got tripped.
KPTCL and APTRANSCO to sort out issues relating to
incongruence in denoting R, Y, B phases of the electric supply
on their respective sides.
APTRANSCO/ KPTCL Pending
[with KPTCL ]
Pending [with PGCIL
(SR-I)]
69/III/3
69/III/7 Tripping of 220 kV Ragulapadu –
Alipura line
12-10-2017 at 01:30
hrs
Annexure-II
Page 7 of 36
76/II/9 Tripping of 230 kV Thiruvalam -
Chittoor line
13-06-2018 at
18:55hrs
Y-phase to earth fault occurred in line. At 230 kV Tiruvalam
end, breaker was under lockout leading to operation of LBB
protection.
1) TANTRANSCO to provide double-bus operation at their
230 kV Thiruvalam SS.
2) APTRANSCO to replace the existing static relays with
suitable numerical relays for various line protections at their
220 kV Chittoor SS.
TANTRANSCO/ APTRANSCO 1) TANTRANSCO Mail dated 29.08.2018 & 11.09.2018:
Material supplied and work to be taken up ---Pending
2) APTRANSCO Mail dated 24.09.2018:
The static relays were replaced with Numerical relay on all 220 kV feeders at 220 kV SS chittoor.-
--Completed
TANTRANSCO Mail dated 11.12.2018:
Due to space constraint, the equipments could not be erected.
Review Meeting on 20.12.2018:
In view of Tiruvalam being inter-state sustation, TANTRANSCO was asked to prvodie double-bus
operation at their 230 kV Tiruvalam SS.
APTRANSCO MAIL DATED 22.01.2019:
Pending [with TANTRANSCO]
TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:
Feasibility for providing hybrid breaker / shifting of bays will be studied & action will be taken.
Time upto Sep 2019
Pending [with
TANTRANSCO]
KPTCL mail dated 19.12.2018:
3). Nagzari-Bidnal PLCC link is healthy --- Completed.
1.--- Pending
2. --- Pending
Review Meeting on 20.12.2018:
1. & 3. Completed
2. Pending
KPCL mail dated 24-12-2018:
1) --- Completed
2) Proposal will be taken up for replacement of existing PZ1000 relays with new version
Numerical Line protection relays having IEC61850 shortly, after availing necessary admnistrative
approval...Pending
3) Completed
KPCL mail dated 23.01.2019:
1. Completed
2. Letter addressed to site to take up the proposal for replacement of PZ1000 line distance
relays.
3. Completed
KPCL mail dated 23.03.2019:
1). COMPLETED
2) Proposal will be taken up for replacement of existing PZ1000 relays with new version
Numerical Line protection relays having IEC61850. Prepration of specification is under progress.
3) COMPLETED
78/II/3 Multiple trippings at 400 kV
Julurupadu
01-08-2018
at 19:33 hrs
400kV Julurupadu-KTPSVII line-1 tripped at at Julurupadu end
on SOTF due to 3-phase to ground fault while charging the
line. 400kV Julurupadu-KTPSVII line-2 tripped at KTPSVII end
due to Over Current protection and 400kV Julurupadu-
Suryapet-2 feeder tripped at Suryapet end on STUB(I>4)
indications.
1) TSGENCO to ensure that the mandate operations
procedures are duly followed by their station personnel at
KTPS end whenever any LC is taken or returned.
2) TSGENCO to ensure the following on all 400 kV lines
emanating from their KTPS-VII station:
• O/C protection is kept disabled.
• High-set operation of line’s DEF protection is kept disabled;
IDMT settings of DEF protection are suitably kept.
3)TSTRANSCO to resolve issues w.r.t. Stub protection
operation at Suryapet end relays for the 400 kV Suryapet -
Julurupadu line-2, and intimate the corrective action taken to
PCSC forum.
TSGENCO/ TSTRANSCO TSTRANSCO mail dated 14-11-2018:
1) Pending.
2) Pending.
3) The stub operation in P444 relay at Suryapet end is due to logic problem and is rectified on
28-10-2018.---Completed.
TSTRANSCO mail dated 27-11-2018:
1) TSGENCO ( AT KTPS - VII stage ) Strictly adhering the operations procedures and following
the standard procedures while taking and returning LC . -
Completed
2) TSGENCO ( at KTPS - VII Stage ) is adopted the settings from TSTRANSCO for the 400 kv
feederes. The settings will be modified accordingly in coordination with TSTRANSCO. --
Pending
3) Completed
Review Meeting on 20.12.2018:
2. TSGENCO informed that the modification of settings will be completed in 1 month.
-----Pending
Pending
78/II/16 Multiple trippings at 220kV
Nagjheri PH
31-08-2018
at 11:49 hrs
Triggering incident was B-E fault in 220 kV Nagjheri -
Ambewadi line-1. As per the information received, after
tripping of 220 kV Naghjeri - Ambewadi line-1, 220 kV
Naghjeri Ambewadi line#2 got overloaded. This resulted in
the tripping of Nagjheri Generating Units #3 and 6 on SPS
operation. At the same time, Unit #2 got tripped on REF
operation.
1)KPTCL to examine the reasons for tripping of more than
one Unit (Units – 3 & 6) on SPS operation at Nagjheri PH
during subject trippings, and furnish a report on the same
along with remedial action taken to PCSC forum.
2)KPCL to employ a suitable time delay of 50 – 60 msec in
operation of REF protection for the GT of Unit-2 at their
Nagjheri PH.
KPTCL/ KPCL Review Meeting on 20.12.2018:
1. KPTCL I formed that SPS scheme finalisation shall be completed in one month time ---
Pending
KPCL mail dated 24-12-2018:
2) Time delay of operation is not changed. However, the external NCT is used for REF
protection against earlier internal NCT for REF, to avoid tripping due to malopration ---
Completed.
KPCL mail dated 23.01.2019:
1) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.
2)....Completed.
KPCL mail dated 23.01.2019:
1) It shall be reviewd and Implemented by KPTCL in coordination with KPCL.
Pending
78/I/2 Complete outage of 220 kV
Nagjheri PH and 220/110 kV
Ambewadi Substation.
17-09-2018 at
14:37hrs
220kV lines connected to Nagjheri PH got tripped due to
successive transient faults. Running Units #3 and #4 at
Nagjheri got tripped on over frequency protection operation
due to loss of evacuating lines resulting in complete outage
of 220 kV Nagjheri. 220 kV Nagjheri being the only source to
220kV Ambewadi station, since 220kV Ambewadi Narendra
line 1&2 were under shutdown during antecedent condition,
tripping of Units at 220 kV Nagjheri resulted in the loss of
supply to 220 kV Ambewadi SS.
1. SLDC/KPTCL to be pro-active in issuing necessary
directions that help in expeditious restoration of the tripped
lines based on the prevailing conditions and grid security.
2.KPCL to implement A/R enabled on all 220 kV lines
emanating from their 220 kV Nagjheri PH, with the help of
KPTCL, by December, 2018. In the event of non-amenability
of the existing PZ1000 relays in providing A/R feature, KPCL
shall take steps to retrofit them with suitable relays that
support A/R.
3. KPTCL to restore PLCC carrier communication on 220 kV
Nagjheri – Bidnal line at the earliest
KPCL/ KPTCL Pending
Annexure-II
Page 8 of 36
TANTRANSCO Mail dated 11.12.2018:
1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator status feedback.
Work under progress. ......Pending
2.Earth value of 110kV earthmat has been improved & 230kV side earthmat work under
progress. Lightning mask earthing renovation under execution............Pending
3.......Pending
APTRANSCO Mail Dated 18.12.2018:
Relays settings reviewed and need to be revised due to change of line length DR & EL's of Main-
1 (P444) relay configured properly. Main-2 (D60) relay to be configured.
Review Meeting on 20.12.2018:
1 & 2). TANTRANSCO informed that Work will be completed by March 2019.
3. APTRANSCO informed that work will be completed by February 2019.
APTRANSCO MAIL DATED 22.01.2019:
Collecting the details of adjacent feeders connected to Gummadipudi for computing revised
relay settings.
TANTRANSCO MAIL DATED 23.01.2019:
Isolator status will be ensured by March 2019
APTRANSCO mail dated 15.03.2019:
3. Revised relay settings were implemented on 16/02/2019 ---Completed
TANTRANSCO MAIL DATED 19.03.2019:
New 230kV isolators have been allotted for replacement of defective isolators. Hence time line
requested upto June.2019
81/IV/3 Tripping of 400 kV Warangal -
Bhoopalapalli line-2
15-12-2018 at 20:42
hrs
Line tripped at Bhoopalapalli end only and was holding from
warangal s/s. FIR, DR and EL of Bhoopalapally were not
furnished.
For the line under consideration, the following shall be
carried out by TSGENCO in coordination with PGCIL (SR-I):
(i) End-to-end communication for DT/ permissive & other
signals may be ensured by testing at both the ends.
(ii) Healthiness of PLCC system components (hardware and
software) at both ends shall be checked and faulty
components shall be repaired/ replaced.
TSGENCO/ PGCIL (SR-I) Yet to be informed Pending
TANTRANSCO/ APTRANSCO1) TANTRANSCO to take steps to implement multi-bus, multi-
zone operation (Double-bus operation) at their 230 kV
Gummidipooindi SS by December, 22018.
2) TANTRANSCO to check if the Gummidipoondi substation is
adequately protected from lightning-strokes by providing
requisite no. of lightning masts and/ or earth-wire caging.
3) APTRANSCO was asked to verify & correct the settings
employed for distance protection at Sullurpeta and configure
DR’s & EL’s of all Protection Relays at their Supllurpet SS
properly for recording only the mandated protections &
digital signals.
Triggering incident was B-phase fault at 230kV
Gummidipoondi Substation due to which 230kV Bus-1 Bus-
bar protection operated. 230kV Gummidipoondi Station was
under single bus operation, hence operation of Bus-bar
protection resulted in tripping of all connected elements.
05-10-2018 at 00:42
hrs
Complete outage of 230/ 110 kV
Gummidipoondi Substation
Andhra Pradesh
Pending [with
TANTRANSCO]
79/I/2
Annexure-II
Page 9 of 36
57/II/9 Tripping of 400 kV Nellore (PG) -
NPS line-1, 400 kV
Krishnapatnam-Nellore (AP)
lines -1&2 and 400kV NPS -
MEPL line
18-07-2016
at 19:05 hrs
Triggering incident was snapping of Y phase conductor in
400kV Nellore (PG) - NPS line-1. Distance relay at
Krishnapatnam end over-reached in Zone-1, and resulted in
tripping of 400kV Krishnapatnam – Nellore (AP) lines - 1&2
from Krishnapatnam end. Distance relay at MEPL over-
reached and resulted in tripping of MEPL-NPS line from MEPL
end.
APGENCO to furnish a report on the remedial action
implemented w.r.t. overreaching of Krishnapatnam end
distance relays during the tripping of 400 kV Nellore (PG) -
NPS line-1
APGENCO Review Meeting dated 19.12.2017:
It was noted that no APGENCO representative had come to attend the meeting.
APGENCO Mail dated 19.12.2017:
Procurement of relays is under progress
Review Meeting dated 20.12.2018:
APGENCO representatives had not come to attend the meeting.
Pending
74/II/21 Tripping of 400 KV Kalikiri –
RYTPP line-2
29-04-2018 at 19:29
hrs
Line tripped on operation of over-voltage protection at
RYTPP and Direct Trip receipt at Kalikiri. The correct
operation of over-voltage tripping could not be validated as
FIR, DR and EL of RYTPP and DR and EL of Kalikiri were not
furnished.
1). APGENCO to furnish detailed report on the reasons for
the tripping of the line including remedial measures taken.
2). APGENCO to ensure that the OVR-settings implemented
at Rayalaseema TPP are as per the SRPC provided settings
issued vide letter dated 01.05.2018, and confirm the same.
APGENCO Status received vide mail dated 25.09.2018:
2). OVR settinss incorporated as per the Lr.No. CE/IPC&PS/SP/13/
400KV -OVR -SRPC/VOL.OI/ D.No,2001333/ 18: Dt: 04.05.18 --- Completed
Review Meeting dated 20.12.2018:
1). It was noted that no APGENCO representative had come to attend the meeting --- Pending
Pending
75/I/2 Complete outage of 400 kV
Kalikiri and 400 kV RyTPP, Stage-
V station
16:08 hrs on
11-05-2018
Triggering incident was R-E fault in 400kV RyTPP- Kalikiri Ckt-
1. Auto reclose (A/ R) was successful at Kalikiri end but didn’t
operate at RyTPP end. This led to tripping of running unit at
RyTPP due to tripping of evacuating line and complete
outage of RYTPP. At the same time 400kV Chittoor-Kalikiri
lines - 1&2 got tripped from Chittoor end on operation of Z3
(mal-operation) resulting in loss of supply to Kalikiri station.
APGENCO to ensure that A/R functionality implemented on
400 kV RyTPP (Stage-V) – Kalikiri lines – 1 & 2 at RyTPP (Stage-
V) end is healthy and in kept service.
APGENCO Status received vide mail dated 25.09.2018:
RTPP,(9taqe-lU end,iis healthy and kept in service. Hence it is requested to drop all the ahove
points.
Review Meeting dated 20.12.2018:
It was noted that no APGENCO representative had come to attend the meeting
--- Pending
Pending
79/III/8 Tripping of 400 kV RYTPP-Kalikiri
line-2
26-09-2018 at 21:13
hrs
Line tripped on B-N fault. Auto-reclose was successful at
Kalikiri and three phase trip at RYTPP due to A/R lock-out.
APGENCO to furnish a detailed report on tripping event
bringing out reasons for A/R non-operation at yTPP end on
400 kV RyTPP – Kalikiri line along with remedial action taken
to PCSC forum.
APGENCO Review Meeting dated 20.12.2018:
It was noted that no APGENCO representative had come to attend the meeting.
Pending
82/III/8 Tripping of 400kV VTPS-
SURYAPET-1
10-02-2019
at 13:20 hrs
B-phase to earth fault occurred in line. Auto-reclose was
successful at Suryapet and breakers got tripped at VTPS end
It was noted that no representative of APGENCO attended
PCSC-82 meeting. APGENCO to furnish a detailed report on
tripping event bringing out reasons for A/R non-operation at
VTPS end along with remedial action taken to PCSC forum.
APGENCO Yet to be informed Pending
82/III/9 Tripping of 400kV VTPS-
SURYAPET-1
15-02-2019
at 14:36 hrs
B-phase to earth fault occurred in line. Auto-reclose was
successful at Suryapet and breakers got tripped at VTPS end
It was noted that no representative of APGENCO attended
PCSC-82 meeting. APGENCO to furnish a detailed report on
tripping event bringing out reasons for A/R non-operation at
VTPS end along with remedial action taken to PCSC forum.
APGENCO Yet to be informed Pending
80/II/18 Tripping of 400 kV Uravakonda -
Veltoor line-2
19-11-2018 at 12:00
Hrs
As per FIR, 400 kV Uravakonda - Veltoor Line-2 tripped on
operation of overvoltage Stage-1 at Uravakonda end and DT
received at veltoor end. From the DR furnished, voltages at
Uravakonda end are: Vr- 243kV, Vy-245kV and Vb-242kV.
From the DR operation of Overvoltage Stage-1 protection
could not be established. Over voltage grading of the line at
Uravakonda end is 109%, 6secs, tripping is not as per grading.
APTRANSCO to adopt recommended OVR, Stage-I and OVR,
Stage-II protections at their 400 kV Uravakonda SS, and to
ensure that OVR-I_START signal is configured for triggering
corresponding Event Logger (EL), and OVR-I_TRIP is
configured for triggering corresponding Event Logger (EL)
and Disturbance Recorder (DR).
APTRANSCO APTRANSCO MAIL DATED 22.01.2019:
Informed to M/s siemens to configure the OVR signals.
APTRANSCO mail dated 15.03.2019:
M/s. Siemens configured OVR signals as per settings on 24/01/2019.
Pending
82/II/5 Tripping of 400 KV Mahbubnagar
– Uravakonda line - 2
22-01-2019
at 18:53hrs
OV St-1 at Uravakonda end and DT was received at
Mahaboobnagar end. From DR, voltages observed are: Vr-
244kV, Vy-247kV and Vb-257kV. B-ph voltage is found to be
higher than R and Y phases.
APTRANSCO to furnish details regarding the reasons for OVR
tripping and also to sort out time sync issues in coordination
with TSTRANSCO.
APTRANSCO Yet to be informed Pending
Annexure-II
Page 10 of 36
07-11-2017 at 23:02
hrs
09-11-2017 at 21:57
hrs
12-11-2017 at 20:54
hrs
17-11-2017 at 21:19
hrs
11-11-2017 at 22:02
hrs
12-11-2017 at 23:09
hrs
24-11-2017 at 18:46
hrs
11-12-2017 at 18:49
hrs
18-12-2017 at 19:10
hrs
74/II/2 Tripping of 400 kV Kurnool-
Srisailam line
01-04-2018 at 18:03
hrs
Line tripped on operation of Over Voltage Stg-1 protection at
Srisailam and Direct Trip was received at Kurnool.
Considerable difference between Phase voltages was
observed in Srisailam end DR. (Vr-257kV, Vy-246kV, Vb-
239kV)
1). TSGENCO was asked to double—check the faulty CVT’s
and replace them at the earliest.
2). TSGENCO was also asked to implement new OVR gradings
issued vide SRPC letter dated 01.05.2018.
TSGENCO TSGENCO mail dated 31.07.2018:
1. TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt
of new CVT’s faulty CVT’s will be replaced with new CVT’s. Replacement of faulty CVT's will be
completed by the end of September 2018.
--- Pending
2.TSGENCO: TSGENCO was implemented new OVR gradings issued by SRPC
--- Completed.
Review Meeting dated 19.12.2018:
1. TSGENCO informed that CVT replacemen will be completed by January 2019
TSGENCO mail dated 26.03.2019:
LC was approved for SLM- KNL feeder from 15 th April'19 to 24 th April"19. During the above LC
period replacement of faulty CVT's will be completed.
Pending
82/I/6 Complete Outage of 220kV
N’Sagar Main Power House of
TSGENCO
17-02-2019 at
23:32 hrs
During change over to Pump Condenser mode, bus fault
occurred at 220kV N’Sagar Main Power House. Due to non-
operation of BBP (Bus Bar Protection), fault was cleared by
tripping of 220kV connected feeders on Zone 2 Distance
Protection operation.
1) TSGENCO is recommended to take proper steps to ensure
correct feedback of all physical and electrical parameters are
obtained in SCADA, in case of any discrepancy in SCADA
feedback, operator must ascertain the correct feedback and
then only proceed with any further actions.
2) Operating personnels should regularly visit the field and
report if any drastic changes in parameters.
TSGENCO Yet to be informed Pending
TSGENCO to adopt stipulated OVR, Stage-I gradings for the
400 kV lines emanating from their 400 kV Srisailam LB RH,
and furnish an action taken report w.r.t. mitigating observed
voltage difference among R & Y & B phases.
PendingTripping of 400 kV Satenapalli-
Srisailam line-1
Line tripped on operation of over-voltage protection at
Srisailam and Direct Trip was received at Sattenapalli.
Considerable voltage difference was observed between R, Y
& B phases at Srisailam end.
71/II/7
TSGENCO mail dated 31.07.2018:
TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt
of new CVT’s faulty CVT’s will be replaced with new CVT’s. Replacement of faulty CVT's will be
completed by the end of September 2018.
TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC.
Review Meeting dated 19.12.2018:
TSGENCO informed that CVT replacement would be completed by January 2019.
TSGENCO mail dated 26.03.2019:
LC was approved for SLM- KNL feeder from 15 th April'19 to 24 th April"19. During the above LC
period replacement of faulty CVT's will be completed.
TSGENCO to adopt stipulated OVR, Stage-I gradings for the
400 kV lines emanating from their 400 kV Srisailam LB RH,
and furnish an action taken report w.r.t. mitigating observed
voltage difference among R & Y & B phases
Line tripped on operation of Over-Voltage protection at
Srisailam and Direct Trip was received at Kurnool.
Considerable voltage difference was observed between R, Y
& B phases.
70/II/2
TSGENCO TSGENCO mail dated 31.07.2018:
1.TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt
of new CVT’s faulty CVT’s will be replaced with new CVT’s. Replacement of faulty CVT's will be
completed by the end of September 2018.
---Pending
2.TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC. ---
Complied
Review Meeting dated 19.12.2018:
1. TSGENCO informed that CVT replacemen would be completed by January 2019
------- Pending
TSGENCO mail dated 26.03.2019:
LC was approved for SLM- KNL feeder from 15 th April'19 to 24 th April"19. During the above LC
period replacement of faulty CVT's will be completed.
Tripping of 400 kV Narnoor –
Srisailam LB line
Line tripped due to operation of over voltage protection at
Srisailam LB end. Considerable phase difference was
observed between phases at Srisailam end
Pending
Pending
1. TSGENCO to take steps to replace the existing faulty CVT’s
at Srisalam end on 400 kV Srisailam – Narnoor line at the
earliest.
2. TSGENCO to adopt stipulated OVR, Stage-I gradings on all
400 kV transmission lines emanating from Srisaliam LB.
TSGENCO
TSGENCO TSGENCO mail dated 31.07.2018:
TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt
of new CVT’s faulty CVT’s will be replaced with new CVT’s. Replacement of faulty CVT's will be
completed by the end of September 2018.
TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC.
Review Meeting dated 19.12.2018:
TSGENCO informed that CVT replacemen would be completed by January 2019
TSGENCO mail dated 26.03.2019:
LC was applied in Advance pre-arranged shutdown programme for SLM - STPL-1 Feeder in the
month of May-2019. Replacement of faulty CVT's will be completed by May-2019.
Tripping of 400kV Kurnool-
Srisailam line
70/II/3
Telangana
Annexure-II
Page 11 of 36
82/II/1 Tripping of 400kV KTPS VI- KTPS
VII
05-01-2019
at 10:17hrs
Line tripped at KTPS VI end due to suspected mal-operation
of over-voltage protection. Line was in service from KTPS VII.,
BUS CVT secondary R PHASE got grounded at KTPS VI
1) TSGENCO to configure OVR_start and OVR_tripin EL at
KTPS-VI end and sent a report after completion of works
related to DT communication channel between KTPS-VI and
KTPS-VII
TSGENCO Yet to be informed Pending
Annexure-II
Page 12 of 36
74/II/8 Tripping of 400/220 kV ICT-2 at
Gajwel
11-04-2018 at 5:50
hrs
400/220 kV ICT-2 at Gajwel tripped on mal-operation of
Buchholtz relay.
1). TSTRANSCO was asked to keep the ICT and its mechanical
protections under observation for detecting any slippages.
2). TSTRANSCO was also asked to configure capturing of
mechanical protections of ICT’s in the respective relay’s/
station’s event logger.
TSTRANSCO TSTRANSCO mail dated 20.06.2018:
1. Mechanical protections of ICTs is under observation. --- Completed
2.New relays are available at site and will be commissioned by 2nd week of August-2018. The
mechanical protection of ICTs will be configured in the new relays ----Pending
TSTRANSCO MAIL DATED 20.10.2018:
2. New relays will be commissioned by end of November-2018 and the Over Voltage settings
will be implemented after commissioning in new relays ----Pending
TSTRANSCO MAIL DATED 06.12.2018:
2. New relays will be commissioned by end of January-2019 and the mechanical protections of
ICTs will be configured in the new relays ----Pending
TSTRANSCO MAIL DATED 22.01.2019:
Relays will be commissioned by end of February, 2019.
Pending
TSGENCO mail dated 26.03.2019
Testing & commissioning of Line Differential Protection (LDP)relays were completed for both
Main-1 & 2 relays for Jurala PH- Jurala SS Feeder-1. For Jurala PH- Jurala SS Feeder-2
retrofitting testing & commissioning of LDP relays for both Main-1 (RED 670) and Main-2
(MICPM P546) were completed except communication establishment between both ends for
Jurala SS Feeder-2 MICOM P546 relay.
The issue was discussed in PCSC-58 meeting held on 18.10.2016, when PCSC forum agreed to
de-link the implementation of the Item from the scope of Protection Audit Recommendations
(PAR), and pursue it as part of PCSC Recommendations.
TSGENCO mail dated 30-05-2017
Procurement of Differential Protection relays is under process and the work will be completed
by the end of November 2017.
TSGENCO mail dated 18-09-2017
Procurement of Line Differential Protection Relays is under process and the work will be
completed by the end of January 2018.
Review Meeting dated 19.12.2017:
TSGENCO informed that they are in constant touch with TSTRANSCO in this regard, and hope to
implement LDP by February, 2018.
TSTRANSCO informed that procurement of LDP relays is under progress, and assured that LDP
would be implemented in 3-months time.
TSTRANSCO MAIL DATED ON 20-01-2018:
The matter is being coordinated with TSGENCO.
TSTRANSCO MAIL DATED ON 05-03-2018:
As a part of implementation of line differential relays for short distance (Jurala PH to Jurala SS)
feeders, procurement of Line Differential Protection Relays are in process and the work will be
completed by the end of June 2018.
TSGENCO mail dated 31.07.2018:
TSGENCO: Purchase Order was placed on 05.06.2018 for Procurement of Line Differential
Protection (LDP) relays and the work will be completed by the end of October 2018
TSTRANSCO MAIL DATED 20.10.2018:
Inspection of the relays is completed and the relays are received at stores. Relays are to be
drawn and commissioned. Work is expected to be completed by end of December 2018.
TSTRANSCO MAIL DATED 22.01.2019:
Relays will be commissioned by end of February, 2019.
PendingPAR/
PCSC-58
Provision of line differential protection for Jurala line 1 & 2 (line length-1.45 KM) feeders at 220 kV Jurala HPS
[Carry-Over from Protection Audit Recommendations]
TSGENCO/ TSTRANSCO
Annexure-II
Page 13 of 36
Mail received on 21-10-2015:
1) Anti-pumping contactors of all the nine 220KV Lines are in circuit and tested periodically
during AOH works of lines along with other protections.
2) Completed.
3) Possibility to use both the 220kV buses as main bus under normal operation is under review.
Mail recieved on 23-11-2015:
1) Completed
3) Two bus operation for 220kV buses : In place of existing CT switching relays, High speed
manual heavy duty change over switch of sufficient current capacity will be retrofitted to all
feeders at 220kV station and same will be operated manually during changeover of feeder by
one bus to the other and this arrangement may facilitate to put both buses in service. Time
required for this retrofit is around 90days . However, this work will be taken up only after
retrofitting of electromagnetic relays with numerical relays for Main-2 protection of all 220kV
lines, for which work is in progress.
Status received vide mail dated 10-07-2017:
1) --- Completed.
2) --- Completed. Status received vide KPCL mail dated 14.12.2017:
3) DPR for implementation of Two Bus operation for 220kV bus system has been prepared and
proposal is placed for funds from PSDF. After the approval of the DPR, the work is proposed to
be taken up.
Review Meeting dated 19.12.2017:
3) KPCL informed that DPR for implementation of Two Bus operation for 220kV bus system has
been prepared and proposal is placed for funds from PSDF. After the approval of the DPR, the
work is proposed to be taken up. Time frame requested for is 2 yrs.
KPCL mail dated 19.12.2018:
3) Work proposed to be taken up under PSDF. Approval from Nodal agency is awaited.
However, arrangements have been made to issue NIT.
Review Meeting on 21.12.2018:
KPCL informed that Tender would be floated in 1 month and work would be completed in 2
years.
KPCL mail dated 23.01.2019:
Tender would be floated in 1 month and work would be completed in 2 years.
KPCL mail dated 23.03.2019:
Arrangements have been made to issue NIT and Tender for the work proposed to be floated
during May- 2019.
Status received vide KPCL mail dated 10.07.2017:
1. (ii) Hot line water washing stopped and off line water washing is carried out whenever the
400 KV Unit or line is under tripped condition / Shutdown condition. --- Completed
1. (iii) Silicon coating for Unit#8 main & tie breakers carried out in Sep'16 and same is under
observation. Till today in order and good condition. For remaining breakers, since it is big order,
approval for the same is under process. --- Pending
2. Static / Electromechanical relays are existing in all 1 to 7 units. Breaker flash over protection
feature will be enabled (if available) in the numerical relays which will be retrofitted in phased
manner during R&M works.
Status received vide KPCL mail dated 14.12.2017:
1.(i) --- Pending
1. (ii) Hot line water washing stopped and off line water washing is carried out whenever the
400 KV Unit or line is under tripped condition / Shutdown condition. --- Completed
1. (iii) Silicon coating for Unit#8 main & tie breakers carried out in Sep'16 and same is under
observation. Till today in order and good condition. For remaining breakers, since it is big order,
approval for the same is under process --- Pending
2. Static / Electromechanical relays are existing in all 1 to 7 units. Breaker flash over protection
feature will be enabled (if available) in the numerical relays which will be retrofitted in phased
manner during R&M works --- Pending
46/II/21 Trippings at 220kV Raichur TPS 07-06-2015 at 01:35
hrs
1. KPCL to check the operation of anti-pumping relay on 220
kV side and keep it in healthy condition.
2. KPCL to provide manual reset to the 220 kV side master
trip relay.
3. KPCL to use both the 220 kV buses as main buses under
normal operation, and should go for single bus operation
only during emergencies.
KPCL Pending
Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed. Unit-4 got
tripped on operation of Generator Differential, Reverse
power & LBB protection. Operation of LBB protection led to
tripping of BUS-2 at RTPS
1.KPCL to undertake the following remedial measures to
avoid breaker flashovers:
(i) Replacing all porcelain insulators with composite
insulators
(ii) Carrying out hot-line water washing of all insulators on
regular basis.
(iii) Applying Room Temperature Vulcanizing (RTV) Silicone
high voltage insulator coatings to all bus-connected ceramic
insulators of equipment like CT, PT, CB, Isolators etc.
2.KPCL to take steps to provide dedicated breaker flashover
protection to all breakers at Raichur TPS at the earliest.
KPCL Pending54/II/9 Tripping of 400kV Raichur TPS
Bus-2
13-04-2016 at 21:12
hrs
Karnataka
Annexure-II
Page 14 of 36
Review Meeting dated 19.12.2017:
1 (iii) As upgradation of 400kV switchyard equip's to be taken under PSDF funds, Silicon rubber
coating for breakers is deffered till then. --- Pending
2. Replacement by Num relay for Units - 5,6 & 7 completed in the month of Oct-2017. Main-I is
Seimens make and Main-II is ABB make. --- Pending
KPCL mail dated 19.01.2018:
2. Replacement of Numerical relays for Units-5, 6 & 7 have been completed. Referred to OEM
for providing the Breaker flashover protection for all the breakers.
KPCL mail dated 19.12.2018:
2. Reply is awaited from OEM of Numerical relays for providing Breaker Flashover protection
for all the breakers --- Pending
Review Meeting on 21.12.2018:
1. KPCL assured that porcelain insulator replacement will be taken care in tender floated for
RTPS Busbar modification --- Pending
KPCL mail dated 23.01.2019:
1) i) Being discussed with other utilitis.
2) Reply is awaiting from OEM to implement the Breaker flash over protection in the Numerical
relays referring to the protection implemented in other 400KV station.
KPCL mail dated 23.03.2019:
1) (i) & (iii)- Arrangements have been made to issue NIT and Tender for the work proposed to
be floated during May- 2019.
2) Reply is awaiting from OEM to implement the Breaker flash over protection in the Numerical
relays in 400KV station. & Being discussed with other utilities.
It is requested to furnish Necessary logic and settings to implement the breaker flashover
protection
Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed. Unit-4 got
tripped on operation of Generator Differential, Reverse
power & LBB protection. Operation of LBB protection led to
tripping of BUS-2 at RTPS
1.KPCL to undertake the following remedial measures to
avoid breaker flashovers:
(i) Replacing all porcelain insulators with composite
insulators
(ii) Carrying out hot-line water washing of all insulators on
regular basis.
(iii) Applying Room Temperature Vulcanizing (RTV) Silicone
high voltage insulator coatings to all bus-connected ceramic
insulators of equipment like CT, PT, CB, Isolators etc.
2.KPCL to take steps to provide dedicated breaker flashover
protection to all breakers at Raichur TPS at the earliest.
KPCL Pending54/II/9 Tripping of 400kV Raichur TPS
Bus-2
13-04-2016 at 21:12
hrs
Annexure-II
Page 15 of 36
54/II/13 Tripping of Units at 220 kV
Raichur TPS
15-04-2016 at 15:36
hrs
During testing of retrofitted distance protection in 400kV
Raichur-2 feeder, LBB protection trip DC got extended to Bus
trip. This resulted in tripping of 220kV bus at RTPS and all
connected 220 kV elements. Unit-4 which is connected to
400 kV Bus got tripped due to tripping of Station Utility
Transformer that is connected 220 kV bus
In view of the availability of two buses along with healthy
bus-coupler at 220 kV RTPS, KPCL is recommended to put in
service the double-bus operation at 220 kV RTPS by suitably
distributing loads within 15 days.
KPCL Status received vide KPCL mail dated 10.07.2017 & 14.12.2017:
Two Bus operation for 220kV bus is being carried out whenever required. However scheme for
tripping of one bus during LBB/fault and maintaining the other bus intact by tripping B/C
breaker will be taken up in R&M works.
Review Meeting dated 19.12.2017:
3) KPCL informed that DPR for implementation of Two Bus operation for 220kV bus system has
been prepared and proposal is placed for funds from PSDF. After the approval of the DPR, the
work is proposed to be taken up. Time frame requested is 2 yrs.
KPCL mail dated 20.12.2018 & 23.01.2019:
Work proposed to be taken up under PSDF. Approval from Nodal agency is awaited. However,
arrangements have been made to issue NIT.
Pending
Annexure-II
Page 16 of 36
Status received vide KPCL mail dated 14.06.2017:
1. All logics checked and found normal. LBB timing checked and found 200msec as per KPTCL
MRT recommendation. - Completed
2. Work Under Progress ---- Pending
3. New GPS System commissioned along with new numerical and synchronised with GPS system
- Complied
4. Work Under Progress ---- Pending
Status received vide mail dated 14.12.2017:
1),3),4) Completed
2. Auto Start of DG set is taken up --- Pending
Review Meeting dated 19.12.2017:
2. KPCL informed that for AMF of DG, Scheme prepared & material procurement under process.
The AMF scheme will be implemented in January 2018. --- Pending
3. The GPS system commissioned on Nov 2016 & all the numarical relay time synchronised with
GPS ---- Completed
Status received vide mail dated 25.07.2018:
AMF panel procurement under progress.
KPCL mail dated 20.1.2.2018:
2. AMF scheme implementation is included in the work ''Replacement common auxiliary panel
with latest technology SCADA compatibility system'' . Availing administration approval is under
progress
Review Meeting on 21.12.2018:
KPCL informed that Tender for the work would be floated by January 2019 and work would be
completed in 1 year.
KPCL mail dated 23.01.2019:
1) Completed.
2) Tender for the work would be floated by February 2019 and work would be completed in 1
year....Pending
3) Completed.
4) Tender for the work would be floated by Feb, 2019, and work would be completed in 1
year....Pending
KPCL mail dated 23.03.2019:
2) Tender for the work proposed to be floated during May- 2019 after model code of conduct
and work would be completed in 1 year .
4) Tender for the work proposed to be floated during May- 2019 after model code of conduct
and and work would be completed in 1 year.
69/II/8 Tripping of 220 kV Kaiga- Kadra
line-1
06-10-2017 at 22:22
hrs
While de-synchronising of Unit-2, B-phase pole of GCB did
not open and pole descrepancy relay operated. Hence all
220KV lines CB hand tripped.
KPCL to take steps to replace the existing static protection
relays for Generator Units and Generating Transformers
(GT’s) with suitable Numerical relays at their 220 kV Kadra
PH.
KPCL Status received vide mail dated 25.07.2018:
Numerical Generator protection relay replacement proposed to be taken up alongwith SCADA
work.
KPCL mail dated 20.12.2018:
Will be taken up along with SCADA work. NIT to be issued on Jan-2019
Review Meeting on 21.12.2018:
KPCL informed that Tender for the work would be floated by March, 2019, and work would be
completed in 1 year.
KPCL mail dated 23.01.2019:
Tender for the work would be floated by February-2019 and work would be completed in 1
year.
KPCL mail dated 23.03.2019:
Tender for the work proposed to be floated during May- 2019 after model code of conduct and
work would be completed in 1 year
Pending
72/I/4 Complete outage of 220kV
Sedam, Shahapur, Shahabad,
Kapanoor, Humnabad and
Halabarga Stations of KPTCL
01-02-2018
at 17:46 hrs
High resistance fault occurred in 110kV Sedam-Chittapur line
near Sedam end. Line DEF operated and backup OC
protection of 100MVA transformer operated at Sedam end.
But line breaker and transformer HV breaker didn’t open due
to problem in trip circuit. This resulted in cascade tripping of
upstream feeders and power supply was lost to six 220kV
stations of KPTCL.
KPCL to disable GFC protection on all lines emanating from
their generating stations.
KPCL Review Meeting on 21.12.2018
KPCL informed that compliance w.r.t. Implementing the recommendation would be furnished
soon.
KPCL mail dated 23.03.2019:
'GFC protection will be disabled in all lines in coordination with M/s.KPTCL
Pending
73/I/5 Complete outage of 220kV
Varahi power station
15-03-2018 at 22:36
hrs
There was Y-phase to ground fault on 220 kV Varahi -
Shimoga line-2. Consequent to persisting fault in ‘Y’ phase,
the breaker failure protection operated resulting in operation
of 220KV bus bar protection at Varahi, tripping all the
connected lines and Varahi running units.
KPCL to take steps to put double-bus operation into service
at their 220 kV Varahi PH.
KPCL Status received vide mail dated 25.07.2018:
Under Implementation.
KPCL mail dated 20.12.2018 & 23.01.2019 & 23.03.2019:
Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-2019
Pending
78/I/1 Complete Outage of 220 kV
Varahi UGPH.
24-08-2018 at 11:00
hrs
Due to suspected mal-operation of 220KV bus bar protection
at Varahi, all the connected lines and Varahi running Units
got tripped. (6 nos 220kV lines and 4 nos Varahi generating
station running Units). This resulted in complete outage of
220kV Varahi UGPH
1. KPCL to take steps to put double-bus operation into
service at their 220 kV Varahi UGPH by December, 2018.
2. KPCL to employ correct operational practices like keeping
DC fuses of B/C CB intact during bus changeover works,
disabling back-up protections of B/C CB during bus
changeover works & enabling them with proper settings only
when it is used as Main-CB of the grid elements.
KPCL KPCL mail dated 20.12.2018 & 23.01.2019:
1. Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-
2019 --- Pending
2. ---- Completed.
KPCL mail dated 23.03.2019:
1) Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-
2019
Pending
Complete outage of 220 kV
Kadra power station of KPCL
06-09-2016
at 14:40 hrs
58/I/3
(GD)
PendingKPCL1) KPCL to check settings of LBB protection in all relays from
which it was implemented, and ensure that their
configuration, logic, and timing are in order at their 220 kV
Kadra PH.
2) KPCL to furnish details regarding the existing LT auxiliary
supply arrangement at their 220 kV Kadra PH, and take steps
to provide a suitable Auto-Main-Fail (AMF) panel for DG set
to effect its auto-starting in case of failure of LT supply.
3) KPCL to ensure time-sync of all relays (DR’s & EL’s) with
GPS at their 220 kV Kadra PH.
4) KPCL to provide stand-alone Event Logger at their 220 kV
Nagjheri PH.
LBB of 220kV Kodasalli breaker at Kadra end got operated
which resulted in tripping of Bus at Kadra and in turn led to
tripping of all elements
Annexure-II
Page 17 of 36
82/I/3 Complete Outage of 220kV
Kadra Power House of KPCL &
220kV Karwar SS of KPTCL
04-02-2019 at
20:19 hrs
During de-synchronising of Kadra unit#2, R-pole didn’t open
due to struck breaker condition. Pole Discrepancy operated.
All the connected 220kV lines at Kadra end were hand
tripped.
1) KPCL to ensure that DR and EL for all events are made
available. If Static relays with no DR are present in Station,
standalone Disturbance recorder and Event logger should be
provided.
2) KPCL to investigate the operation of Negative sequence
relay and report to SRPC since the operation of Negative
sequence relay due to stuck breaker condition is not proper
as per protection philisophy
KPCL Yet to be informed Pending
Mail received on 28-04-2015:
1. In view of operating 220kV Ambewadi SS in split bus mode, action is being taken up by
KPTCL. Problem in the 220kV bus coupler breaker is attended and isolator overhauling work is
under progress. Spilt bus operation at Ambewadi will be made possible at the earliest. ---
Pending
2. ICT Protection system at Ambewadi and trippings occured at Supa GS during the instance is
checked up and remedial measures already furnished in this regard.
---- Completed
Mail recieved on 29-07-2015:
1. Action is being taken by KPTCL for operating Ambewadi in split bus mode. Problem in bus
coupler breaker is attended.Isolator overhaulling work is completed.PTs are already provided
to 220kV Bus-II. After commissioning of Bus-II PTs, Ambewadi can be operated in split bus KPTCL Mail dated 16.12.2017 & Review Meeting dated 19.12.2017:
1. Recommended works at Ambewadi have not been taken up due to various problems faced
due to poor response from the turn key agency M/s ERL. A site meeting is planned during this
month to discuss about further plan of action for attending SRPC recommendations pertaining
to the Sub station.
The issue was discussed in the review meeting. Considering the importance of the substation
and delay in executing the works, it was decided to escalate all pending issues relating to
Ambewadi SS to KPTCL top Management for early completion.
KPTCL mail dated 20.12.2018:
1. The outstanding protection issues pertaining to Ambewadi were appraised to the
management and proposal for construction of new GIS SUb stations has been approved by
KPTCL management. In view of attending protection audit recommendations pertaining to
Ambewadi SS without linking with new Station proposal, action has been taken to include the
works in extended scope of R&U project awarded to M/s GE T&D India Limited. Addition
materials required are yet to be supplied by M/s GE.
Mail received on 28-04-2015:
Procurement of Bus bar and LBB protection is in the final tendering stage. 2. Action is being
taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will be enabled.
Mail received on 29-07-2015:
1. Procurement of Bus bar and LBB protection is in the final tendering stage.
2. Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will
be enabled after restoration of PLCC.
KPTCL mail received on 23-01-2016:
1. Bus bar protection panels pocured and erected at Sedam. Wiring , testing ,commissioning is
being taken up.Planned to complete by April 2016.
2. Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will
be enabled after restoration of PLCC.
KPTCL Mail recieved dated 22-11-2017:
1 & 2). Bus Bar Protection panel and required Wave traps are supplied under R&U. Wave trap
to be commisioned in Tandoor line and PLCC to be restored.Once PLCC is restored AR will be
enabled. The Wave traps required are supplied under R&U project and the same is to be
commisioned at Sedam end for restoration of PLCC.
KPTCL Mail dated 16.12.2017:
1 & 2) Replacement of Bus Bar Protection is included under R&U project. Awarded to M/s GE
Ltd. Panels have alredy been supplied by the Agency. The work will be taken up on top priority.
Review Meeting dated 19.12.2017:
KPTCL informed that the works relating to put A/R in service are going on at their Sedam SS,
and assured that it would be put into service by February, 2018.
KPTCL mail dated 20.12.2018:
1). Bus Bar Protection Work is under progress. Work will be completed in 2 months.
---- Pending
2). ---A/R was enabled from Sedam end on 03.11.2018 ----Completed.
PendingKPTCLTriggering incident was B-phase to earth fault in 220kV
Ambewadi- Nagzari line-1. B-pole of breaker did not open at
Ambewadi end. LBB protection not available at Ambewadi
end. All elements tripped on Zone-2 from remote ends.
22-12-2014
at 21:22 hrs
R-Phase to ground fault occurred on 220kV Sedam-Shahpur
line. Fault not cleared from Sedam end due to stuck-breaker
condition. While the Sedam- Sahapur line tripped from
Shahapur end in Zone-1, the other 220 kv lines from Sedam
tripped at remote ends in Zone-2. This caused complete
outage of 220kV Sedam substation.
GD-1 at 220kV Ambewadi
Station of KPTCL
27-01-2015 at 8.00
hrs
Complete outage at 220kV
Sedam Substation of KPTCL (GD-
1)
KPTCL
1. Till the completion of R&M works for bus bar and LBB
protection, KPTCL shall explore the possibility of having split
bus operation at Ambewadi and submit the details of the
same to PCSC forum.
2. KPTCL shall provide the details of the tripping of Supa
hydro station connected downstream from 110 kV bus.
1. KPTCL to provide Bus bar and LBB protections for 220 kV
bus at Sedam S/s.
2. KPTCL to implement A/R feature on 220 kV Sedam-
Tandur inter-state line.
40/I/1
41/I/4 Pending
Annexure-II
Page 18 of 36
42/I/1 Complete outage of 220kV
Sedam substation of KPTCL
15-02-2015
at 14:24 hrs
Fault occurred in 220kV Sedam-Shahpur line 1. KPTCL to provide Bus Bar protection and LBB protection at
Sedam S/s and furnish the status of their implementation to
PCSC forum.
2. KPTCL to implement A/R feature on 220 kV Sedam-Tandur
inter-state line.
KPTCL Mail received on 27-05-2015:
1. Bus Bar protection will be provded under R&U.
2. A/R yet to be enabled.
Mail received on 29-07-2015:
1. Procurement of Bus bar and LBB protection is in the final tendering stage.
2. Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will
be enabled after restoration of PLCC.
KPTCL Mail Recieved dated 22-11-2017:
Bus Bar Protection panel and required Wave traps are supplied under R&U. Wave trap to be
commisioned in Tandoor line and PLCC to be restored.Once PLCC is restored AR will be
enabled.
KPTCL Mail dated 16.12.2017:
1. Replacement of Bus Bar Protection is included under R&U project. Awarded to M/s GE Ltd.
Panels have alredy been supplied by the Agency. The work will be taken up on top priority.
2. AR feature will be enabled during retrofitting of Main-2 relays.
Review Meeting dated 19.12.2017:
1 & 2) KPTCL informed that the works are under progress and are targeted to be completed by
February, 2018.
KPTCL mail dated 20.12.2018:
1). Bus Bar Protection commissioning works under progress. Work will be completed in 2
months.
2). Attended. --- Completed
Pending
Mail received on 29-07-2015:
1. Procurement of Bus bar and LBB protection is in the final tendering stage.
2. Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will
be enabled after restoration of PLCC.
KPTCL Mail Recieved dated 22-11-2017 & 16.12.2017:
1.Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and
Ambewadi-Xeldom lines are radial lines, it was decided that enabling AR is not required. To
clear the faults in the abovelines early, the timings of the Zone 2 was reduced to 150mS and the
Back Up EFR timings have been reducedto 150mS. --- Completed
2.The planned works as per R&M could not be taken up due to the problem with the vendor
and could not be taken up under R&U project due to administrative reasons. ---- Pending
Review Meeting dated 19.12.2017:
2. The issue was discussed. Considering the importance of the substation and delay in
executing the works, it was decided to escalate all pending issues relating to Ambewadi SS to
KPTCL top Management for early completion.
KPTCL mail dated 20.12.2018:
The protection issues pertaining to Ambewadi was appraised to the management and
proposal for construction of new GIS SUb stations has been approved by KPTCL management.
Further as per SRPC directions and in view of attending protection audit recommendations
pertaining to Ambewadi SS without linking with new Station proposal, action has been taken to
include the works in extended scope of R&U project awarded to M/s GE T&D India Limited.
Addition materials required are yet to be supplied by M/s GE. work expecnted to be completed
in 5 months.
KPTCL1. KPTCL shall provide A/R feature on Ambewadi – Ponda 220
kV D/C inter-state line.
2. Till the completion of R&M works for bus bar and LBB
protection, KPTCL shall explore the possibility of having split
bus operation at Ambewadi and submit the details of the
same to PCSC forum.
Fault in 220kV Ambewadi-Nagjheri line-2Complete outage of 220 kV
Ambewadi substation of KPTCL
12-03-2015 at 7:51
hrs
42/I/2
(GD)
Pending
Annexure-II
Page 19 of 36
48/I/3 Outage of 220kV Ambewadi
station in Karnataka
30-09-2015 at 10:41
hrs
220kV Ambewadi-Nagjheri line-2 tripped on B-phase to earth
fault. This resulted in loss of supply to 220kV Ambewadi bus.
220kV Ambewadi-Ponda line-1&2 were hand tripped after
deenergization of bus at Ambewadi.
KPTCL to fast-track providing A/R on all 220 kV lines
emanating from Ambewadi SS to prevent Station shut-down
on temporary faults.
KPTCL KPTCL mail received on 23-01-2016:
Will be complied in a months time.
KPTCL Mail Recieved dated 22-11-2017:
Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and
Ambewadi-Xeldom lines are radial lines, it was decided that enabling AR is not required. To
clear the faults in the abovelines early, the timings of the Zone 2 was reduced to 150mS and the
Back Up EFR timings have been reducedto 150mS.
KPTCL Mail dated 16.12.2017:
Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and
Ambewadi-Xeldom lines are radial lines, it was decided that enabling AR is not required. To
clear the faults in the abovelines early, the timings of the Zone 2 was reduced to 150mS and the
Back Up EFR timings have been reduced to 150mS. In view of the above, it is requested to drop
the issue from this list.
Review Meeting dated 19.12.2017:
KPTCL informed that AR would be enabled at Ambewadi end for lines other than Ponda and
Xeldom lines during retrofitting of Back Up protection by Distance protection relay at
Ambewadi.
Considering the importance of the substation and delay in executing various works, it was
decided to escalate all pending issues relating to Ambewadi SS to KPTCL top Management for
early completion.
Pending
KPTCL mail dated 20.12.2018:
The protection issues pertaining to Ambewadi was appraised to the management and
proposal for construction of new GIS SUb stations has been approved by KPTCL management.
Further as per SRPC directions and in view of attending protection audit recommendations
pertaining to Ambewadi SS without linking with new Station proposal, action has been taken to
include the works in extended scope of R&U project awarded to M/s GE T&D India Limited.
Addition materials required are yet to be supplied by M/s GE. work will be completed in 5
months
KPTCL Mail received dated 25-05-2016:
SEE, RTC, Bangalore to update the status
KPTCL Mail received dated 28-06-2016:
Providing numerical bus bar protection to 400kV buses and GPS time synchronising equipment
at Guttur is considered under R&U. Work is awarded to M/s Alstom, execution will be taken up
shortly.
KPTCL Mail received dated 25-04-2017:
GPS and accessories will be supplied during May 2017, expected to complete the work within a
month after supply of materials.
KPTCL Mail Recieved dated 22-11-2017:
As discussed during the earlier PCSC meetings, current limit of 12.5KA has been added in the
logic of AR at Guttur end to prevent reclosing during failure of LA or any other very close faults.
Replacement of existing static BBP by new numerical BBP with Main 1&2 will be taken up at
Guttur for which the panels are already supplied. Presently, replacement of 220KV side Bus bar
protection is under progress. DI for delivery of GPS receiver has already been issued, but there KPTCL Mail dated 16.12.2017:
1). The work of replacing static type 400kV Bus Bar Protection scheme by numerical BBP is
under progress at Guttur.
--- Pending
2). GPS time syncronising device is expected to be supplied before end of December 2017 ---
Pending
Review Meeting dated 19.12.2017:
1) & 2) KPTCL informed that the works are under progress, and are targeted to br completed by
February, 2018.
KPTCL Mail dated 26.06.2018:
GPS time synchronisaionis provided for protection relays under R&U project. Replacement of
400kV BBP by numerical BBP is envisaged under R&U works. Additional quantity of controls
cables required to take up the BBP replacement work. Supply of control cables awaited.
KPTCL mail dated 20.12.2018:
1. Replacement of static BBP provided to 400kV side by numerical BBP and the work of
providing DR/ EL collection system is under progress. Work will be completed in 3 months -----
Pending
2. GPS time synchronising equipment already commissioned.
--- Completed.
17-01-2016 at 18:53
hrs
Multiple tripping at 400kV
Guttur SS
Failure of Lightning Arrestor of Y-phase Line Reactor of 400kV
Guttur-Hiriyur line-1 and line tripped on distance protection
Zone-1. Bus-bar protection of 400kV Bus-2 at Guttur
substation also got operated during the event sensing this
through fault. 400/220 kV ICT-1 & 2 at Guttur, 400kV Kaiga-
Guttur-2, 400kV
Guttur-Narendra-2, 400kV Guttur-Hiriyur-2 and 400kV Guttur-
Munirabad which are on 400kV Bus-2 got tripped during the
incident. 400kV Guttur-Narendra-1 which was on Bus-1 also
tripped at the same time.
KPTCL 1. KPTCL to configure all DR’s and EL’s at 400 kV Guttur SS so
that they will also get triggered for BBP operation.
2. KPTCL to ensure time-synchronization of all DR’s and EL’s
with GPS at their 400 kV Guttur SS.
51/II/21 Pending
Annexure-II
Page 20 of 36
KPTCL Mail received dated 25-04-2017:
Replacement of existing BBP by new BBP with 4 zone protection is being taken up under R&U.
KPTCL Mail Recieved dated 22-11-2017:
GE Ltd has already supplied the necessary Bus Bar protection panels for replacement of the
existing static type BBP by new numerical BBP with 4 zone protection under R&U project. The
work of commissioning the same will be taken up shortly.
KPTCL Mail dated 16.12.2017:
Due to operational constraints two/ multi bus operation is not being implemented.
Review Meeting dated 19.12.2017:
It was noted that Shimoga SS is having required configuration for providing double-bus
operation. However, due to large no. of feeders (15 in no) with variable gneration at certain
remote ends like Varahi, the flows on these lines are bound to vary. As such it is necessary to
zero in on appropriate arrangement of feeders on different buses so that bus-isolators of the
feeders are not overloaded.
The issue was discussed. KPTCL was asked to try out multi-bus operation on trial basis to arrive
at suitable arrangement of feeders.
KPTCL mail dated 20.12.2018:
Bus sectionaliser breakers have to be provided for operating Shimoga in multi bus mode.
Estimates have to be prepared by CEE,TZ,Hassan. Work expected to be completed in 1 year.
KPTCL Mail Recieved dated 22-11-2017:
1. The necessary Bus Bar protection panels are already supplied to Chikkodi under R&U project.
Presently R&U works at sub stations subjected to audit are taken up. After completion of PAR
works, the baove works are planned.
--- Pending
2. --- Pending
3. --- Pending
KPTCL mail dated 16.12.2017:
1.The necessary Bus Bar protection panels are already supplied to Chikkodi under R&U project.
Control cables have to be supplied. Presently R&U works at sub stations subjected to audit are
taken up. After completion of PAR works at 26 Sub stations, remaining works will be taken up
through M/s GE.
--- Pending.
2. --- Pending
3. --- Pending
Review Meeting dated 19.12.2017:
1. KPTCL informed that BBP would be provided by April, 2018.
---- Pending
2. KPTCL informed that DPR settings had been reviewed.
---- Completed
3. EFR on failure of B-ph PT of 220 kV Bus-2 had been furnished to CEA. ---- Completed
KPTCL mail dated 20.12.2018:
1). Bus Bar Protection work is included under R&U. work expected to be completed in 3
months ---- Pending
2). Major equipment failure reports are being sent to CEA regularly ---- Completed.
01-07-2016 at 03:03
hrs
Tripping of 220 kV Chikkodi-
Mudshingi and 220 kV Chikkodi-
Talandage lines
220kV Bus Bar protection operated during failure of R phase
CT in DVG-2 line bay.
22-02-2016 at 15:03
hrs
Complete outage of 220 kV
Shimoga substation
57/II/1 PendingKPTCL1.KPTCL to take steps to provide busbar protection at their
220 kV Chikkodi inter-regional substation, and furnish a time-
line for the same.
2.KPTCL to review distance protection settings for 220 kV
Chikkodi – Kudachi line.
3.KPTCL to furnish equipment failure report of the current
incident to PSE&TD Division of CEA with a copy marked to
SRPC.
Triggering incident was failure of B-ph PT of 220kV Bus-2
(western bus) at 220KV Chikkodi substation. 220KV Chikodi-
Belgaum-I line tripped on DEFR (Inst), 220KV Chikkodi-
Kudachi line tripped on Distance protection and also 100MVA
transformer-2 tripped on E/F protection.
KPTCLKPTCL to operate 220 kV Shimoga on multi-bus operation
under normal conditions, and put it on single-bus operation
only under emergency conditions.
52/I/3 Pending
Annexure-II
Page 21 of 36
KPTCL mail received dated 25.04.2017:
Numerical BBP is being provided under R&M works.
KPTCL Mail Recieved dated 22-11-2017:
1. Numerical Bus Bar protection panels have already been supplied as a part of R&M works
awarded to GE Ltd. Due to issue regarding the sectionaliser CTs, the work had stopped. Now
the same is resolved and the the above work will be taken up after supply of sectionaliser CTs. --
- Pending
2. --- Pending
KPTCL Mail dated 16.12.2017:
1. Numerical Bus Bar protection panels have already been supplied as a part of R&M works
awarded to GE Ltd. Due to issue regarding the sectionaliser CTs, the work had stopped. Now
the same is resolved and the the above work will be taken up after supply of sectionaliser CTs. --
- Pending
2. --- Pending
Review Meeting dated 19.12.2017:
1. KPTCL informed that BBP at 220 kV Hoody would be provided by March, 2018.
---- Pending
2. EFR on failure of R-ph CT of 220/ 66 kV Transformer-2 had been furnished to CEA. ----
Completed
KPTCL mail dated 20.12.2018:
1). The R&M work of 220kV Hoody SS is under progress and expected to be comleted before
the end of August 2019. Providing Bus Bar Protection to 220kV buses is a part of R&M work at
Hoody ----- Pending
62/II/5 Tripping of 220 kV South Bus
and connected elements (220kV
HSR, 220kV Nagnathpura, 220 kV
Harohalli, 220 kV
Subramanyapura, 220 kV
Tataguni, 220 kV Mallur and
400/220kV ICT-2 and 3) at
400/220kV Somanhalli
substation of KPTCL
(Load loss: 850 MW)
20-01-2017 at 14:34
hrs
Triggering incident was fault in 66 kV Somanahalli -
Bannerghatta line and fault was cleared by operation of Back-
up OCR at Somanahalli end.
KPTCL to provide numerical Busbar Protection at their 220 kV
Somanahalli SS at the earliest.
KPTCL KPTCL mail received dated 25.04.2017:
Numerical BBP is being provided under R&M works
KPTCL Mail Recieved dated 22-11-2017:
Tesing & Commissioning of numerical BBP at Somanahalli is under progress. There was some
technical issue wth BBP scheme supplied to Somanahally which is being finalised in
consultation with OEM SIFANG. Numerical BBP will be commissioned at Somanahally within a
month's time.
KPTCL Mail dated 16.12.2017:
Numerical Bus Bar protection Scheme will be commissioned at Somanahally before end of
December 2017.
KPTCL mail dated 20.12.2018:
The work of providing Bus Bar Protection to 220kV buses is incuded under R&M works
envisaged at Somanahally. The R&M work is expected to be completed before end of March
2019 ----- Pending
Pending
74/I/2 Complete outage of 220 kV
Ambewadi station
02-04-2018 at
13:46hrs
Loss of supply occurred to 220 kV Ambewadi station due to
tripping of 220kV Nagzhari-Ambewadi line-2 (Source) from
Nagzhari power station. After bus dead, Ambewadi-Ponda
lines – 1 & 2 were hand-tripped. In antecedent conditions,
220kV Ambewadi - Nagjheri ckt-1, 220kV Ambewadi-
Narendra Ckt-1 &2 were out of service.
1). KPTCL to review operation of SPS at NPH for proper
functionality and changed network conditions (reduction of
generation with tripping of evacuating lines) and put it into
service at the earliest.
2). KPTCL to furnish equipment failure report of the current
incident (R-phase CT in Nagjheri – 1 bay at Ambewadi SS) to
PSE&TD Division of CEA with a copy marked to SRPC.
KPTCL KPTCL mail dated 20.12.2018:
1). To be reviewed. Expected to be completed in 1 month.---- Pending
2), Being followed ----- Pending
Pending
74/II15 Multiple Trippings at 400/220kV
Guttur station
21-04-2018 at 12:50
hrs
Triggering incident was fault in 220 kV Davanagare - Shimoga
line. Bus bar protection operated at Guttur resulting in
tripping of all the connected elements. 220 kV Guttur was on
single bus operation due to CVT problem in Bus-2.
KPTCL to put double-bus operation at their 220 kV Guttur
substations by attending to Bus-2 CVT problem.
KPTCL KPTCL mail dated 20.12.2018:
Bus-2 CVT problem is attended. However due to breaker replacement works, 220kV side
operated in single bus mode.
Review Meeting dated 20.12.2018:
KPTCL informed that double-bus operation at their 220 kV Guttur would be provided within
two months.
Pending
79/III/9 Tripping of 400 kV JSWEL
–Guttur line
29-09-2018
at 11:30 hrs
R-phase to earth fault occurred in line. Auto-reclose was not
attempted at JSWEL due to DT receive. At Guttur end auto-
reclose could not be validated with DR/EL.
KPTCL to furnish a detailed report on tripping event bringing
out reasons for DT sending from Guttur end to JSWEL on 400
kV Guttur - JSWEL line along with remedial action taken to
PCSC forum.
KPTCL Review Meeting on 21.12.2018:
KPTCL was aksed to furnish status of implementation of the recommendation given at the
earliest.
Pending
80/II/7 Tripping of 400 kV JSWEL-Guttur
line
17-10-2018 at 02:04
Hrs
Triggering incident was R-phase to earth fault in line. At
Guttur end there was operation of pole discrepancy and
resulted on tripping of Y & B pole after a duration of 2
seconds from the occurrence of fault. FIR, DR & EL of Guttur
end were not furnished.
KPTCL to examine the reasons for sending of DT from Guttur
end to JSWEL end, and furnish an action taken report
including remedial measures taken to rectify the same.
KPTCL Yet to be informed Pending
82/I/4 Complete Outage of 220kV
Ambewadi Station of KPTCL
06-02-2019 at
14:51hrs
Fault occurred while test charging of 220kV Ambewadi –
Nagjheri Line -2 from Ambewadi end. Suspected stuck
breaker condition at Ambewadi end) led to clearing of fault
by tripping of remote end breaker in Zone-2. LBB protection
is not active at 220kV Ambewadi station.
KPTCL to investigate the reason for non-tripping of 220kV
Ambewadi - Nagjheri line-2 on operation of SOTF and submit
a report regarding the same to SRPC. Also KPTCL to take
necessary measures in order to ensure healthiness of breaker
before testcharging of any line.
KPTCL Yet to be informed Pending
KPTCL1. KPTCL to provide Busbar protection at their 220 kV Hoody
SS at the earliest.
2. KPTCL to furnish an Equipment Failure Report on CT failure
to CEA with a copy marked to SRPC.
Failure of R-phase CT of 220/ 66 kV transformer-2 at 220kV
Hoody end resulted in a bus fault in 220kV Bus-2. Fault was
cleared by backup protection of ICT's (220kV lines were being
radially operated) due to absence of busbar protection
09-01-2017
at 23:06 hrs
Tripping of 220 kV Bus 2 and
connected elements (220kV HAL
#1 and 2, 400/220 kV ICT- 1, 2
and 220/66 kV ICT-2) at 400/220
kV Hoody substation of KPTCL
(Load loss : 590 MW)
62/II/3 Pending
Annexure-II
Page 22 of 36
82/I/8 Complete outage of 220kV
Alipura substation
20-02-2019 at 12:45
hrs
As informed by KPTCL, Suspected delayed clearance of fault
in 220 kV BTPS-Lingapur line from BTPS end resulted in
tripping of lines from Alipura S/s.
1) KPTCL is recommended to furnish detailed report
regarding spurious operation of DEF at Alipur SSand check
the directionality of DEF on all lines.
2) KPTCL is requested to share the revised zone settings for
Distance protection at BTPS end.
KPTCL Yet to be informed Pending
82/II/12 Tripping of 400kV Kaiga-Guttur
line-1&2
07-02-2019
at 11:49 hrs
Line-1 tripped due to insulator flashover. Line-2 tripped due
to zone-3 operation at Kaiga and Direct trip receive at Guttur
KPTCL is recommended to take necessary measures to
ensure that Main-I and Main-II at Guttur end shall be of
different types (make and model) coherent with the general
protection philosophy followed in SR region.
KPTCL Yet to be informed Pending
Annexure-II
Page 23 of 36
KPTCL Mail Recieved dated 22-11-2017:
1. coordination of KPCL has been requested for enabling AR lines terminated to Nagajari.
2. AR will be enabled at Ambewadi end for lines other than Ponda and Xeldom lines during
retrofitting of Back Up protection by Distance protection relay at Ambewadi.
KPTCL Mail dadted 16.12.2017 & Review Meeting dated 19.12.2017:
1. KPTCL informed that Coordination of KPCL has been requested for enabling AR lines
terminated to Nagajari.
--- Pending
2. KPTCL informed that AR would be enabled at Ambewadi end for lines other than Ponda and
Xeldom lines during retrofitting of Back Up protection by Distance protection relay at
Ambewadi. -- Pending
KPTCL mail dated 20.12.2018:
2). Readiness from KPTCL for implementing AR is already confirmed to KPCL. Decision pending
from KPCL end.
Review Meeting on 21.12.2018:
1). KPCL informed that A/R will be provided on all 22 kV lnies emmanating from Nagjheri PH
within 3 months time ----- Pending
KPCL mail dated 23.03.2019:
1) Proposal will be taken up for replacement of existing PZ1000 relays with new version
Numerical Line protection relays having IEC61850. Prepration of specification is under progress.
Status informed during Special Meeting held on 03.06.2016:
1. KPTCL informed that the matter had been taken up with concerned Line Operation and
Maintenance wing to carry out corridor clearance and maintenance as per schedule to avoid
frequent line faults in this corridor. A letter had also been addressed to Chief Engineer,
Bhagalkot zone, to ensure lines in & around Kali complex are maintained in healthy condition. ---
Completed
2. KPTCL assurd that the final modified SPS would be implemented at Nagjheri PH at the
earliest. ------ Pending
3. KPCL informed that Nagjhari- Kodasalli Lines 1 & 2 had been kept in service since 23.05.2016
@ 08.06hrs.
--- Completed
KPTCL Mail received dated 28-06-2016:KPTCL Mail dated 16.12.2017:
1) & 3). --- Completed.
2). Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be
discussed and approved by the SRPC forum --- Pending
Review Meeting dated 19.12.2017:
2. The SPS proposed by KPTCL was discussed and the PCSC forum suggested certain changes for
suitable incorporation. KPTCL agreed to look into the same and assured that the modified SPS
would be furnished by January, 2018.
Review Meeting on 21.12.2018:
2. KPTCL informed that Nagjheri SPS shall be finalised in 1 month.
KPCL mail dated 23.01.2019 & 23.03.2019:
1) .....Completed
2) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.
3) .....Completed
49/I/3 Complete outage of 220kV
Ambewadi Substation of KPTCL
29.10.2015 at 14:34
hrs
220kV Nagjheri-Ambewadi line-1 tripped at 13:33 hrs due to
B phase to earth fault. Ambewadi was radially fed from
Nagjheri power station through 220kV Nagjheri-Ambewadi
line-2. Tripping of this line caused 220kV Bus shut down at
Ambewadi and remaining lines and transformers were hand
tripped
1. KPCL to provide A/R on all 220 kV lines emanating from
Nagjheri PH.
2. KPTCL to provide A/R on all 220 kV lines emanating from
Ambewadi SS.
KPCL/ KPTCL Pending
220kV lines from Nagjheri power house started tripping from
11:00 hrs due to fault in lines. The sequence of tripping is
shown in SOE list. At 12:33 hrs, 220kV Narendra-Ambewadi
lines-1&2 got tripped which resulted in loss of evacuation
path to Nagjheri station resulting in tripping of running Units
and complete outage at Nagjhheri power station. 220kV
Ambewadi station also got de-energized due to tripping of
source feeders i.e. 220kV Narendra-Ambewadi-1&2 and
220kV Nagjheri-Ambewadi-1&2.
22-02-2016 at 12:36
hrs
Complete outage of 220 kV
Nagjheri power station and 220
kV Ambewadi substation of
KPTCL
1. To avoid tripping of transmission lines on transient faults,
KPCL/ KPTCL is recommended to carry out periodic patrolling
of lines, and ensure their proper maintenance by carrying out
jungle/ bushing clearance and trimming of tree branches
within the RoW of transmission lines as per the SRPC
transmission line patrolling guidelines (available under the
menu item "All Uploads/ Operation/ Miscellaneous/
Transmission Line Patrolling Protocol / Guidelines for
Southern Region" on SRPC website).
2. KPCL/ KPTCL to review operation of SPS at NPH for
functionality (reduction of generation with tripping of
evacuating lines) and healthiness.
3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into
service if more than 200 MW generation from Kali Complex
(with Nagheri Contribution not less than 50 MW) is ensured
on sustained basis.
51/I/3 KPCL/ KPTCL Pending
Annexure-II
Page 24 of 36
KPCL mail dated 23.01.2019 & 23.03.2019:
1) …Completed.
2) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.
3) …Completed.
TANGEDCO
Tamil Nadu
25-01-2017 at 22:36
hrs
PendingTANGEDCO mail dated 15.04.2017:
1) New Relay is tested and ready for replacement.Now all 5 units are in service.The relay will be
replaced when lesser units are in service. --- Pending
2.a)Steps are taken to renovate & mordernization of all the control panel into Numerical based
control panels. --- Pending
2.b) Since 230 KV indoor switchyard has no spare space providing dual CT`s is not fessible. --
Completed
3) Procurement of EL & DR is under progress. --- Pending
TANGEDCO mail dated 26.04.2017:
1) Check zone New Relay is replaced on 17.04.2017 -- Completed.
2. --- Pending
3. --- Pending
TANGEDCO mail dated 13.12.2017:
2).P & C wing gives clearance to TTPS to procure the Bus bar protection relays and protection
relays and SER / DR system vide Lr.CE/P&C/SE/D/EEPC4/AEE3/F.TECH/D.27/17 Dated:
05.10.2017. To get administrative approval budgetary offer has bar protection relay from
various companies ----Pending
3). SRPC vide Lr: SRPC/SE- III/CEA/2017/6450/DT:27.10.2017 gives features of SER/DR.
Budgetary offer will be called for SER / DR having above features. ---Penidng
Review Meeting dated 19.12.2017:
2) & 3) The issue was discussed and TANGEDCO was asked to provide time-line for
implementing the recommendations.
Mail dated 29.01.2018:
Procurement work is under progress and will be completed by December 2018.
Review Meeting on 21.12.2018:
TANTRANSCO informed that Tender would be floated by January 2019 and Procurement is
expected by APril 2019. Works would be completed by December 2019.
KPTCL Mail received dated 28-06-2016:
Modifications to be carried in Nagzari SPS logic is submitted to SRLDC/SRPC for verification
and approval
Status received vide KPCL mail dated 14.06.2017:
1. Tripped since there was evacuation problem and there were only two lines NA-1 and NA-2 ---
- Completed
2. Will be reviewed in consultation with EE(RT), KPTCL, Hubli. --- Pending
3. Both the lines are in charged condition. --- Completed.
KPTCL Mail Recieved dated 22-11-2017:
2. Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be
discussed and approved by the SRPC forum. --- Pending
KPTCL Mail dated 16.12.2017:
1) & 3). --- Completed.
2). Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be
discussed and approved by the SRPC forum --- Pending
Review Meeting dated 19.12.2017:
2. The SPS proposed by KPTCL was discussed and the PCSC forum suggested certain changes for
suitable incorporation. KPTCL agreed to look into the same and assured that the modified SPS
would be furnished by January, 2018.
Review Meeting on 21.12.2018:
KPTCL informed that Nagjheri SPS shall be finalised in 1 month.
KPCL/ KPTCLComplete outage of 220kV
Ambewadi station of KPTCL and
220kV Nagjheri of KPCL
18-03-2016 at 14:40
hrs
Ambewadi Narendra line-2 tripped on fault and 220kV
ambewadi Narendra line-1 tripped due to over-loading.
Running Units at Nagjheri also tripped during the event due
to tripping of evacuating lines
1. KPCL to furnish a report on the reasons for Unit-6 tripping
at Nagjheri PH.
2. KPCL/ KPTCL to modify suitably the SPS at Nagjheri Power
House such that it would also factor in the over loading of
Ambewadi-Narendra lines.
3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into
service if more than 200 MW generation from Kali Complex
(with Nagheri Contribution not less than 50 MW) is ensured
on sustained basis.
Failure of Bus Section-I Y-ph CT resulted in operation of bus-
bar protection for Bus Sections -I & II. Running Units#1, 4 and
5, 230 kV Kayathar, 230kV Kudankulam, 230kV Sterlite,
Station Transformer-1, 2 & 3 got tripped during the incident.
Unit – 2 & 3 were not in service.
Tripping of running Units &
230kV feeders at Tuticorin TPS
of TANGEDCO
(Gen Loss: 640 MW)
Pending
62/II/7 1. TANGEDCO to replace existing Check-Zone relay with a
new one possessing required performance.
2. TANGEDCO to take steps to provide numerical busbar
protection at their 220 kV Tuticorin TPS. TANGEDCO may also
explore providing dual CT’s (on either side) for all B/S
breaakers at the time of commissioning of numerical BBP, if
there were no space constraints.
3. TANGEDCO to take steps to provide for standalone Event
Logger (EL) and standalone Disturbance Recorder (DR) with
automatic downloading facility to a centralized server.
53/I/3
Annexure-II
Page 25 of 36
TANTRANSCO Mail received on 19-02-2016 and 24-03-2016:
Revision of Bus Bar Protection setting was carried out. The stabilizing voltage setting was
raised from 410 to 450 volts. After completing the necessary test, the bus bar protection put in
to service on 29.12.2015.
Mail Received on 27-04-2016 ,16-06-2016,25-07-2016 & 24-09-2016:
Revision of Bus Bar Protection setting was carried out. After completing the necessary test, the
bus bar protection put in to service on 29.12.2015.
Mail received on 10-11-2016 & 20.12.2016:
Provision of Bus Coupler bay arrangement was included in the Upgradation works proposed and
the same was sanctioned by MoP through PSDF.
Numerical relay allotted and being commissioned.
Mail received on 20-02-2017:
Numerical BBP relay was commissioned on 02.02.2017
Status received vide mail dated 12.04.2017 & 01.06.2017 & 15-06-2017:
Numerical BBP relay was commissioned on 02.02.2017.
Provision of Bus Coupler bay arrangement was included in the Upgradation works proposed and
the same was sanctioned by MoP through PSDF.
Status received vide mail dated 04.08.2017:
Numerical BBP relay was commissioned on 02.02.2017.Status received vide mail dated 18-09-2017 & 31-20-2017:
Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus Coupler bay is
arranged and zone segregation will be provided.
Status received vid email dated 12-12-2017:
Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus Coupler bay has
been allotted. Zone segregation will be provided after commissioning of CT.
Review Meeting dated 19.12.2017:
TANTRANSCO informed that the recommendation would be complied with by March, 2018.
TANTRANSCO Mail received on 25-01-2018:
Provision of CT in Bus Coupler bay is arranged and zone segregation will be provided. Timeline:
March-2018.
TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018:
Bus coupler bay equipments allotted will be commissioned by Aug 2018
TANTRANSCO MAIL DATED 23.07.2018:
Commissioning of CT in Bus Coupler bay is under progress
TANTRANSCO MAIL DATED 29.08.2018 & 11.09.2018:
Commissioning of CT in Bus Coupler bay is under progress Will be completed by Oct.2018.
Status received vid email dated 11-12-2018:
Civil work completed & CT will be commissioned after strengthening Bus .2 conductor
jumpers.Awaiting Bus LC Time line before January 2019.
TANTRANSCO MAIL DATED 23.01.2019:
Erection under progress will be completed before 31.01.2019
TANTRANSCO MAIL DATED 19.03.2019:
Buscoupler bay will be commissioned by June 2019
TANTRANSCO to examine the feasibility of providing two
main-zone operation for bus bar protection by exploring
various alternatives like replacing existing bus-coupler CB
with a hybrid bus-coupler CB that comes with inbuilt CT,
replacing existing BBP relay with another suitable relay that
supports two main-zone operation, and implement the same.
PendingBusbar protection got operated for a fault in 230kV Mywadi-
Anaikadavu line
21-12-2015 at 6:28
hrs
50/I/3 Complete outage of 230kV
Mywadi station of TANTRANSCO
TANTRANSCO
Annexure-II
Page 26 of 36
TANTRANSCO mail received on 25-01-2018:
1) Commissioning of Bus Coupler CT, Extended Bus with Additional Bus Coupler is under
progress. Timeline: June-2018.
2) Numerical BBP commissioned on 29.08.2017 to enable Bus seggregation.
3) Providing Re-Trip feature for LBB will be studied.
TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018:
Providing new Bus coupler bay involes bay shifting work.work awarded and under progress.
Time line. Dec2018.
TANTRANSCO MAIL DATED 23.07.2018:
Providing new Bus coupler bay involes bay shifting work.work awarded and under progress.
Time line. Dec2018.
TANTRANSCO MAIL DATED 29.08.2018 & 11.09.2018:
Providing new Bus coupler bay involes bay shifting work.work awarded and under progress.
Time line. Dec2018.
Status received vid email dated 11-12-2018:
Bus coupler erected and commissioning schedule on 18.12.2018.
Review Meeting on 21.12.2018:
1. Bus coupler errected and commissioning would be completed by January 2019 --- Pending
2. -----Completed
3. Works would be completed by Janaury, 2019 --- Pending.
TANTRANSCO MAIL DATED 23.01.2019:
work under progress & will be commissioned on or before 31.01.2019
TANTRANSCO MAIL DATED 19.03.2019:
Commissioned on 03.02.2019
Mail recieved on 25-07-2016 & 24-09-2016:
TANTRANSCO: Auto Transformer-2 HV side Bus isolator 'C'-phase support insulator of 230kV
Southern Bus was replaced and Bus Bar Protection scheme was restored on 12.05.2016.
Status received vide mails received on 10-11-2016 & 20.12.2016 & 12.04.2017 & 01.06.2017 &
15-06-2017 & 04.08.2017 & 18.09.2017:
CT is not available in the Bus Coupler bay for zone segregation. CT latch relay is to be provided
for all bays for zone segregation.
Status received vide mails received on 31-10-2017 & 12-12-2017:
Numerical Bus bar protection panel allotted and will be commissioned with zone segregation..
Review Meeting dated 19.12.2017:
TANTRANSCO informed that Numerical BBP would be commissioned by March, 2018.
TANTRANSCO mail received on 25-01-2018:
Commissioning of Numerical Bus bar protection is under progress. Zone segregation will be
ensured. Timeline: March-2018.
TANTRANSCO mail received on 24-03-2016:
CMR relay for extending LBB protection was released and LBB extended from Distance
Protection relay directly. CT is not available in the Bus Coupler bay for zone segregation.
However, during commissioning of third ICT, Bus section Breaker will be provided for zone
segregation. Numerical BBP relay will be provided.
Status received vide mails recieved on 27-04-2016 and 20-05-2016 ,16-06-2016, 25-07-2016, 24-
09-2016,10-11-2016 & 20.12.2016 & 12.04.2017 & 01.06.2017 & 15-06-2017:
1 & 2) CT is not available in the Bus Coupler bay for zone segregation. However, during
commissioning of third ICT, Bus section Breaker will be provided for zone segregation.
Numerical BBP relay will be provided.
Status received vide mail dated 04.08.2017:
1 & 2) Contract awarded for providing third ICT & Bus modification works to accomodate bus
coupler bay. Numerical BBP relay has been provided and tesing under progress.
Status received vide mail dated 18.09.2017:
1 & 2) Contract awarded for providing third ICT & Bus modification works to accomodate bus
coupler bay. Numerical BBP relay has been provided and tesing under progress.
Status received vide mail dated 01.11.2017:
1 & 2) Contract awarded for providing third ICT & Bus modification works to accomodate bus
coupler bay.
Pending51/I/1
(GD)
Complete outage of 230kV
Madurai S/s (Chekanaurani) of
TANTRANSCO
19-01-2016
at 11:56 hrs
Fault had occurred in 230kV Madurai-Sembatty line. Trip
from distance relay was not extended to breaker due to
protection DC fail. LBB protection got operated resulting in a
busbar trip at 230kV Madurai substation. All elements got
tripped as there is a single bus operation at 230kV Madurai
S/s
1. TANTRANSCO to provide split-bus operation with bus
sectionalizer CB for their 230 kV Madurai (Chekanurani) SS.
2. TANTRANSCO to provide two main-zone operation for the
numerical BBP that is being commissioned.
3. TANTRANSCO to examine the feasibility of providing Re-
Trip feature for the LBB protection, and accordingly take
steps for implementing the same.
TANTRANSCO
55/I/1
(GD)
Complete outage of 230 kV
Gummidipoondi Station of
TANTRANSCO
12-05-2016 at 12:15
hrs
Flashover of Auto Transformer- 2 HV
B-phase Isolator supporting insulator of 230kV Southern Bus
occurred at Gummidipoondi station. At the time of fault, Bus
bar protection relay was not in service for pre-commissioning
testing of Auto Transformer-2. All feeders got tripped due to
operation of zone-2 protection from remote ends.
TANTRANSCO to take steps to provide double-bus operation
at their 230 kV Gummidipoondi SS.
TANTRANSCO Pending
Annexure-II
Page 27 of 36
TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018:
Numerical Busbar protection relay commissioned on 14.05.2018
TANTRANSCO MAIL DATED 23.07.2018:
Control & Status of isolator feedeback to be provided by replacement of Drive Mechanism box.
TANTRANSCO MAIL DATED 29.08.2018:
Control & Status of isolator feedeback to be provided by replacement of Drive Mechanism box.
TANTRANSCO MAIL DATED 11.09.2018:
Control & Status of isolator feedeback to be provided by replacement of Drive Mechanism box.
Timeline requested upto Dec 2018.
Status received vid email dated 11-12-2018:
1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator status feedback.
Work under progress. Lightning mask work under progress will be completed within three days.
Review Meeting on 21.12.2018:
TANTRANSCO informed that Double bus operation would be provided by March, 2019.
TANTRANSCO MAIL DATED 23.01.2019:
Isolator status will be ensured by March 2019
TANTRANSCO MAIL DATED 19.03.2019:
New 230kV isolators have been allotted for replacement of defective isolators. Hence time line
requested upto June.2019
55/I/1
(GD)
Complete outage of 230 kV
Gummidipoondi Station of
TANTRANSCO
12-05-2016 at 12:15
hrs
Flashover of Auto Transformer- 2 HV
B-phase Isolator supporting insulator of 230kV Southern Bus
occurred at Gummidipoondi station. At the time of fault, Bus
bar protection relay was not in service for pre-commissioning
testing of Auto Transformer-2. All feeders got tripped due to
operation of zone-2 protection from remote ends.
TANTRANSCO to take steps to provide double-bus operation
at their 230 kV Gummidipoondi SS.
TANTRANSCO Pending
Annexure-II
Page 28 of 36
The issue was discussed in PCSC-58 meeting held on 18.10.2016, when PCSC forum agreed to
de-link the implementation of the Item from the scope of Protection Audit Recommendations
(PAR), and pursue it as part of PCSC Recommendations.
Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 &15-06-2017 &
04.08.2017 & 18.09.2017 & 31-10-2017& 12-12-2017:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner.
Review Meeting dated 19.12.2017:
TANTRANSCO informed that the recommended works of providing different make Relays for
Main-I & Main-II are targeted to be completed by September, 2018.
TANTRANSCO mail received on 25-01-2018:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner. Timeline: September-2018.
TANTRANSCO MAIL DATED 22.05.2018:
TANTRANSCO informed that the recommended works of providing different make Relays for
Main-I & Main-II are targeted to be completed by September, 2018.
TANTRANSCO MAIL DATED 08.06.2018:
provision of Different make Relays for Main-I & Main-II will be completed by September,
2018.
TANTRANSCO MAIL DATED 23.07.2018:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner. Timeline: September-2018.
TANTRANSCO MAIL DATED 29.08.2018 & 11.09.2018:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner. Timeline: September-2019.
TANTRANSCO MAIL DATED 11-12-2018:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner. Timeline: September-2019
TANTRANSCO MAIL DATED 23.01.2019:
Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a
phased manner. Timeline: September-2019
14-09-2016 at
11:13Hrs
Bus Bar Protection (Zone-2) of 230 kV Bus-B got operated at
Alamathy Station during fault in 230 kV Alamathy-Korattur
feeder.
58 Different type and Make of distance protection relays to be provided for Main-I & Main-II protection for 230kV feeders at 400 kV Sunguvarchathiram & 230 kV Sunguvarchathiram
Substation [Carry-Over from Protection Audit Recommendations]
TANTRANSCO Pending
Mail received on 10-11-2016 & 20.12.2016:
1. The Bus Bar Protection scheme will be tested for healthiness including the CT circuits.
2. High impedance BBP relay will be replaced by Numerical relay.
Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 & 15-06-2017:
1. The Bus Bar Protection scheme was tested for healthiness including the CT circuits. AREVA
make CTs in Alamathy SS are having different kneepoint voltage for the cores. CT cores of
higher knee point voltage has been choosen for BBP in 230kV Korattur, 230kV OPG-1 & 230kV
OPG-2 feeders on 29.11.2016. ---- Completed.
2. High impedance BBP relay will be replaced by Numerical relay. --- Pending,
Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017 & 12-12-2017.
1. ---- Completed
2. High impedance BBP relay will be replaced by Numerical relay. --- Pending
Review Meeting dated 19.12.2017:
2) TANTRANSCO informed that Numerical BBP would be provided by April, 2018 ---
Pending
TANTRANSCO mail received on 25-01-2018:
1. --- Complied.
2. High impedance BBP relay will be replaced by Numerical relay. Timeline: April-2018.
TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018 & 23.07.2018:
2.Numerical BBP relay will be provided. Timeline: Sep-2018.
TANTRANSCO MAIL DATED 29.08.2018 & 11.09.2018:
1. Complied
2.Numerical BBP relay will be provided. Timeline: Sep-2018.
TANTRANSCO Pending58/II/17 Multiple tripping at 230 kV
Alamathy Station
Bus Bar Protection (Zone1) of 230kV Bus-A got operated at
Alamathy Station during fault in 230 kV Alamathy-OPG-1
feeder.
15-09-2016 at 22:14
hrs
1. TANTRANSCO to check the healthiness of BBP relay by
conducting stability test, and take appropriate remedial
action like increasing voltage settings, ensuring the
healthiness of CT’s, using CT’s with similar characteristics
(equal saturation effects & equal winding resistances) etc. at
their 230 kV Alamathy SS.
2. TANTRANSCO to replace the existing high-impedance BBP
relay with its low-impedance/ numerical variant so as to
accommodate variation in CT characteristics at their 230 kV
Alamathy SS.
Annexure-II
Page 29 of 36
TANTRANSCO MAIL DATED 11-12-2018:
Numerical BBP relay to procured. Timeline: Sep-2019.
TANTRANSCO MAIL DATED 23.01.2019:
Numerical BBP relay to be procured. Timeline: Sep-2019.
TANTRANSCO MAIL DATED 19.03.2019:
Numerical BBP relay to be procured. Timeline: Sep-2019.
TANTRANSCO Pending58/II/17 Multiple tripping at 230 kV
Alamathy Station
Bus Bar Protection (Zone1) of 230kV Bus-A got operated at
Alamathy Station during fault in 230 kV Alamathy-OPG-1
feeder.
15-09-2016 at 22:14
hrs
1. TANTRANSCO to check the healthiness of BBP relay by
conducting stability test, and take appropriate remedial
action like increasing voltage settings, ensuring the
healthiness of CT’s, using CT’s with similar characteristics
(equal saturation effects & equal winding resistances) etc. at
their 230 kV Alamathy SS.
2. TANTRANSCO to replace the existing high-impedance BBP
relay with its low-impedance/ numerical variant so as to
accommodate variation in CT characteristics at their 230 kV
Alamathy SS.
Annexure-II
Page 30 of 36
64/1/4 Complete outage of North
Chennai TPS STG-1
26-03-2017
at 23:14hrs
Tripping of evacuating lines due to fault led to tripping of
running Unit at NCTPS Stg-1
1. TANTRANSCO to take steps to complete insulator
replacement works on the 230 kV lines owned by them in
NCTPS area within 6 months.
2. TANTRANSCO to take steps to implement A/R on all 230
kV lines emanating from NCTPS-I at the earliest.
TANTRANSCO Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017:
1. All the Porcelain insulators were replaced with Polymer insulators in 230kV NCTPS-I -
Tondiarpet feeders - 1 & 2.
---- Completed
2. AR will be implemented on all 230kV lines emanating from NCTPS-I. --- Pending
Status received vid email dated 12-12-2017:
1. Completed
2. The scheme needs modification to enable AR, since AR was not envisaged for this station
during commissioning. AR will be implemented on all 230kV lines emanating from NCTPS-I
within six months. --- Pending
Review Meeting dated 19.12.2017:
2) TANTRANSCO informed that A/R would be implemented on all 230 kV lines emanating from
NCTPS-I by June, 2018.
TANTRANSCO mail received on 25-01-2018:
1. Complied.
2. The scheme needs modification to enable AR, since AR was not envisaged for this station
during commissioning. AR will be implemented on all 230kV lines emanating from NCTPS-I
within six months. Timeline:June-2018.
Pending
TANTRANSCO MAIL DATED 22.05.2018:
2. The scheme needs modification to enable AR, since AR was not envisaged for this station
during commissioning. AR will be implemented on all 230kV lines emanating from NCTPS-I
Timeline:Sep -2018.
TANTRANSCO mail received on 08-06-2018:
1. Complied.
2. The scheme needs modification to enable AR, since AR was not envisaged for this station
during commissioning. AR will be implemented on all 230kV lines emanating from NCTPS-I
Timeline:Sep -2018.
TANTRANSCO MAIL DATED 23.07.2018:
AR implemented for 4 feeders and remaining lines will be provided with AR subsequently.
TANTRANSCO MAIL DATED 29.08.2018:
1. Complied
2. AR enabled for 3 feeders.
TANTRANSCO MAIL DATED 11.09.2018:
1. Complied
2. AR enabled for 5 feeders.
TANTRANSCO MAIL DATED 11-12-2018:
2. Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &
Alamathy feeder . static relay to be replaced. Timeline - 1 year
TANTRANSCO MAIL DATED 23.01.2019:
Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &
Alamathy feeder . static relay to be replaced. Timeline -Sep 2019
TANTRANSCO MAIL DATED 19.03.2019:
Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &
Alamathy feeder . static relay to be replaced. Timeline -Sep 2019
77/II/9 Multiple trippings at
400 kV Manali Substation
TANTRANSCO to refer the issue of selective tripping of 400
kV side breakers, and non-tripping of 230 kV side breakers
due to operation of Densimeters on low pressure in the
instant case to their OEM, and share OEM’s advice/ remedy
in this regard.
TANTRANSCO mail dated 11.09.2018:
OEM will be referred
Review Meeting on 21.12.2018:
TANTRANSCO was asked to update the status.
TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:
The issue was referred with OEM & reply awaited
Pending
79/I/3 Complete outage of 230 kV
Thiruvalam Substation
05-10-2018 at 14:32
hrs
Bus-1 got tripped at 230 kV Thiruvalam substation due to
spurious LBB relay (independent) operation of 230kV
Thiruvalam Chittoor line. 230kV Thiruvalam substation was
under single bus operation; hence operation of LBB
protection resulted in tripping of all connected elements
resulting in the complete outage
TANTRANSCO to take steps to implement multi-bus, multi-
zone operation (Double-bus operation) at their 230 kV
Thiruvalam SS by December, 2018.
TANTRANSCO TANTRANSCO MAIL DATED 11-12-2018:
Due to space constraint, the equipments could not be erected.
Review Meeting on 21.12.2018:
It was noted that the station was on a single (Main) bus and there was not even transfer bus. In
view of the importance of 230 kV Thiruvalam SS, TANTRANSCO was asked to take steps to
provide dobule-bus operation at their 230 kV Tiruvalam SS.
TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:
Feasibility for providing hybrid breaker / shifting of bays will be studied & action will be taken.
Time upto Sep 2019
Pending
Annexure-II
Page 31 of 36
80/II/12 Tripping of all elements
connected to 230 kV Anaikadavu
SS
06-11-2018 at 21:35
Hrs
Triggering incident was failure of R-ph PT of 230 kV
Anaikadavu Bus-1. 230 kV Bus bar protection of bus-1
operated resulting in tripping of all the connected elements.
230 kV Anaikadavu was on single bus operation due to failure
of Bus-2 PT during antecedent conditions.
1) TANTRANSCO to adopt recommended OVR, Stage-I and
OVR, Stage-II protections at their 400 kV Anaikadavu and 400
kV Rasipalayam stations, and to ensure that OVR-I_START
signal is configured for triggering corresponding Event Logger
(EL), and OVR-I_TRIP is configured for triggering
corresponding Event Logger (EL) and Disturbance Recorder
(DR).
2) TANTRANSCO to take steps to restore multi-bus, multi-
zone operation at their 230 kV Anaikadavu SS at the earliest.
TANTRANSCO TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:
1……Complied
2.Bus PT is to be supplied by the Turnkey contractor will be replaced by 31.03.2019
Pending
82/I/1 Complete outage of 400kV
Sriperumbudur station
28-01-2019
at 01:15 Hrs
Failure of ‘R-phase’ HV side Current transformer (CT) of
315MVA 400/230kV ICT-3 at 400kV Sriperumbudur substation
(400kV TANTRANSCO switchyard).
1) TANTRANSCO to ensure proper legends for DR Digital
signals and all required events(including CB status, Type of
protection operated) are captured in Event logger.
2) TANTRANSCO to extend BBP trip from BusBar relay to 86A
(with source-1 DC) in addition to 86B (with source-2 DC), or
to provide Common trip relay 96 with redundant DC supply.
3) TANTRANSCO to inform the action plan with timelines for
providing Numerical BBP at Sriperumbdur SS .
4) TANTRANSCO to check the healthiness of all CT’s in the
stationand submit a report regarding the same to SRPC to
prevent any such occurrence in future.
TANTRANSCO Yet to be informed Pending
82/I/10 Complete outage of 230kV
Mywadi substation of
TANTRANSCO
04-03-2019 at
11:25hrs
As per the verbal information received, triggering incident
was B-ph bus fault. Bus bar protection of Bus-1 and Bus-2
operated at 230kV Mywadi substation
TANTRANSCO to inform the reason for overflow of DR and
EL of 230kV Anaikadavu-Mywadi line and action plan to
prevent the same in future.
TANTRANSCO Yet to be informed Pending
Annexure-II
Page 32 of 36
KSEB Mail received vide dated 17.01.2017:
1. 110 kV bus bar protection progressing ----Pending
2. Connection of 220kV earth mat and 110 kV plate earthing system completed.---- Completed
3. Redundancy of 110V DC system in progress. Complete independent redundancy is not
practical for the time being. 48 V DC redundancy was already there. ----Pending
4. Instead of stand alone event logger, SCADA system of 110 kV feeder is expected to be
completed by the end of 2017. SCADA system of 220kV side will be taken up after that ----
Pending
KSEB Mail received vide dated 18.09.2017:Status received vide mail dated 12-12-2017:
1. Detailed engineering of the scheme has been completed. Material procurement is in
progress. ---Pending
2.,3. ---- Completed
4. The SOE and DR are available with time stamping from the numerical relays. Hence stand
alone event logger is not necessary ----- Completed
Status received vide mail dated 11-12-2018:
Work has been already tendered. It is expected that purchase process will completed within
three months.
Status received vide mail dated 17.01.2019:
At the time of bid only one bidder participated and the work has been retendered.
Status received vide mail dated 19.03.2019:
Status as on 18.03.2019: Based on the retender, have received two offers from 1) GE T&D Ltd
2)Consyse . The offer from GE T&D is found to be technically acceptable.But the rate received is
above PAC and the request has been submitted to CE ( Trans South ) for sanction to issue
purchase order.
79/I/1 Complete Outage of 220 kV
Idukki Power Station
01-10-2018 at 04:16
hrs
Triggering incident was R-Ph fault in 220kV Idukki-
Kalamassery line-2. R-phase pole of breaker didn’t open at
Idukki end. LBB of Bus-2 operated resulting in tripping of all
connected elements along with running Unit#4 at Idukki and
50MVA station transformer. At the same time, 220kV Idukki
Kalamassery line-1 also got tripped at Idukki end.
Subsequently running Units 1 and 2 also tripped on Governor
oil Low Pressure due to loss of AC supply. This resulted in
complete outage of Idukki PS.
1). KSEBL to check & correct the LBB time setting employed
at their Idukki PH to 200 msec.
2). KSEBL o ensure that DR’s & EL’s of all Protection Relays
(PR’s) at their Idukki PH are configured for recording all
mandated protections & signals.
KSEBL Status received vide mail dated 11-12-2018:
1) Present setting is 180ms.OEM(ABB) suggests that it will give around 200ms delay as it is
having inherent delay is of around 20ms(ie, 180ms +20ms =200ms).With this setting the fault
clearence is found after 220ms.So further revision may be carried out after discussion.
2)Breaker status will be ready only after completing the GOOSE network as part of renovation
of all feeder panels and Idukki first stage units by June 2019 .
Pending
80/II/5 Multiple trippings at 220 kV
Madakathra station
15-10-2018 at 08:57
Hrs
Triggering incident was Y-phase to ground fault in 220kV
Madakathra – Palakkad_KL (Ellapully) line due to flashover of
pilot insulator string. Auto-reclose was successful at
Madakathra end. At the same time bus differential relay Zone-
C mal-operated resulting in tripping of all elements
connected to the bus.
KSEBL to take steps to replace the existing static (high
impedance type) 220 kV BBP with numerical Busbar
protection at their 220 kV Madakathara SS.
KSEBL Status received vide mail dated 11-12-2018:
In progress
Status received vide mail dated 19.03.2019:
Status as on 18.03.2019: Estimate sanctioned by CE(Transmission North ) and have prepared
the technical specifications.Tendering procedures are yet to get started.
Pending
82/I/5 Complete Outage of 220kV
Bhramapuram substation of
KSEB
08-02-2019 at
10:28 hrs
Complete outage of 220kV Brahmapuram SS occurred due to
suspected mal operation of Bus Bar protection.
1) KSEBL to furnish detailed report regarding the healthiness
of BBP operation at 220kV Brahmapuram after testing of the
same on 12th April 2019.
2) KSEBL to submit the action plan regarding
(i) Replacing of the Static High impedance BBP (using CRM
relays) with Numerical BBP.
(ii) Replacement of CRM relays and relays with no
Disturbance recording facilitites.
KSEBL Yet to be informed Pending
Kerala
23-08-2016
at 11:20 hrs
58/I/1
(GD)
PED
Complete outage of 220 kV
Kalamassery Substation
Triggering incident was conductor snapping in 110 kV
Kalamassery- Kaloor feeder
PGCIL (SR-I) & PGCIL (SR-II)
PendingKSEB to take steps to provide the following at their 220/ 110
kV Kalamassery SS:
1. Busbar protection at 110 kV level
2. Connecting 220 kV and 110 kV sides on to a common
earthmat
3. Redundant DC supply for both protection (220 V) and
communication (48 V) applications
4. Stand-alone Event Logger
1. Time-frame?KSEB
Annexure-II
Page 33 of 36
75/II/6Multiple trippings at 400 kV
Raichur-PG SS
03-05-2018
at 18:03 hrs
400 kV RTPS – Raichur PG line-2 tripped due failure of LA in B-
phase at Raichur-PG end. 400 kV RTPS – Raichur PG line-1 &
400 kV Raichur (PG) - Gooty line-1 tripped on operation of
Over-voltage, stage-II protection.
1) PGCIL (SR-I) to set right issues w.r.t. carrier
communication on 400 kV Raichur-PG – RTPS line-2.
2) PGCIL (SR-I) to refer instant trippings to CTU to carry out
Electro Magnetic Transient Phenomena/ Program (EMTP)
analysis, and obtain suitable advice.
3) PGCIL (SR-I) to adopt new OVR-I gradings issue vide SRPC
letter dated 01.05.2018 at their 765/ 400 kV Raichur-PG SS.
PGCIL (SR-I)
PGCIL (SR-I) mail dated 10.12.2018:
1) In 400kV Raichur-RTPS line-1&2 old BPL make PLCC panels were retrofitted with new
PUNCOM make DTPC on 11.08.2018 by availing line S/Ds. presently both channels are
healthy....Completed
2) POWERGRID didn't have EMTP testing provision. Requested CTU to carryout EMTP study. As
discussed, in 75th PCSC Meeting, please advice POSOCO also to carryout EMTP study. ALl DRs in
Comtrade format shared with SRLDC.
3) New OVR gradings issued by SRPC letter dtd 01.05.2018 has been adopted at Raichur SS.....
Completed
Review Meeting on 21.12.2018:
2. As informed by PGCIL (SR-I), it was noted that they are yet to receive analysis containing
study results from CTU. In tthis regard, PGCIL (SR-I) was requested to pursue with CTU to get
the job done at the earliest. In case CTU does not have the capability for conducting EMTP
studies, the same may also be informed. --- Pending
Pending
79/III/3
Tripping of 400 kV Vijayawada –
Nellore-AP line-2
11-09-2018 at 15:26
hrs
B-phase to earth fault occurred in line. At vijayawada end
there was zone-2 trip due to non-receipt of carrier which was
in-turn due to PLCC carrier channel fail. Auto-reclose not
attempted.
PGCIL (SR-I) to take steps to disable sending of DT to the
remote end upon any 3-ph trip (esp. DPR, Z2) operation at
Vijayawada end on 400 kV Vijayawada – Nellore-AP line-2,
and to employ it for a select set of protections such as OV
(Stage-I/ Stage-II), LBB, Reactor backup protections. PGCIL (SR-I)
PGCIL (SR-I) mail dated 10.12.2018:
PGCIL-SR1 The recommended changes will be done in next planned S/D.
Pending
82/II/6 Tripping of 400/220 kV ICT-1 at
Khammam
27-01-2019
at 14:33hrs
ICT-1 at Khammam tripped on operation of IV side non
directional Over-current high set during failure of L.A in
220kV Khammam (Budhidampadu)-Suryapet line-2
PGCIL (SR-I) to immediately take necessary actions to raise
the Highset pick up current setting as per protection
standards since unwarranted tripping of ICT for fault on
220kV line compromises the reliability of Power system. In
any case the transformer protection should not encroach
into protection zone of nearby protection element.
PGCIL (SR-II) Yet to be informed
Pending
73/III/4 Tripping of 400 kV ILFS-
Nagapattinam PS line-1.
28-03-2018 at 10:32
Hrs
R-phase to earth fault had occurred in line. Auto-reclose
attempt could not be validated with submitted DR of
Nagapattinam end.
PGCIL (SR-II) to furnish a report on the reasons for A/R non-
operation, and the remedial action taken to rectify the same.
PGCIL (SR-II) Review Meeting on 21.12.2018:
PGCIL (SR-II) was asked to furnish the status of implementation of the recommendation at the
earliest.
Pending
74/II/20 Tripping of 400/ 220 kV ICT-2 at
Somanahalli
25-04-2018 at
15:23hrs
ICT-2 got tripped due to mal-operation of Buchholtz’s relay. 1). PGCIL (SR-II) to take steps to replace the faulty PNRV’s of
the ICT’s with the proposed reverse flow blocking devices at
the earliest at their Bidadi, Somanahalli, and Pavagada
stations.
2). PGCIL (SR-II) to configure Event Loggers (EL’s) to capture
events msec level at their Somanahalli SS.
PGCIL (SR-II) Review Meeting on 21.12.2018:
PGCIL (SR-II) was asked to furnish the status of implementation of the recommendation at the
earliest.
Pending
75/II/5 Tripping of 400 kV Kolar –
Tiruvalam line
03-05-2018
at 23:40 hrs
Line tripped on operation of Over-Voltage Stg-1 protection at
Kolar and Direct Trip was received at Tiruvalam. It’s Y-ph
voltage was observed to be 5kV higher when compared to R
& B phase voltages at Kolar.
PGCIL (SR-II) to configure Event Loggers of various protection
relays at their Kolar SS to record events with time stamp that
contains all denominations of time, viz., Hours, Minutes,
Seconds, and Milliseconds.
PGCIL (SR-II) Review Meeting on 21.12.2018:
PGCIL (SR-II) was asked to furnish the status of implementation of the recommendation at the
earliest.
Pending
25-07-2018
at 01:53 hrs
29-07-2018
at 02:02 hrs
80/II/9 Tripping of 400/220 kV ICT-2 at
Bangalore (Somanahalli)
26-10-2018 at 12:10
Hrs
400/220 kV ICT-2 at Bengaluru (Sonamahalli) tripped due to
operation of LV side over flux protection which in turn was
due to suspected 220 kV CVT problem.
PGCIL (SR-II) to configure DR’s & EL’s all protection relays at
their 400/ 220 kV Somanahally SS for all mandated
protections and signals.
PGCIL (SR-II) Yet to be informed Pending
PGCIL (SR-II) Pending77/II/13 Tripping of 400 kV Guttur-
Narendra-PG line-1
Review Meeting on 21.12.2018:
PGCIL (SR-II) was asked to furnish the status of implementation of the recommendation at the
earliest.
Line tripped on operation of over-voltage protection at
Guttur. DR & EL not furnished to validate the tripping
PGCIL (SR-II) to check for healthiness of line CVT’s at Guttur
end on 400 kV Guttur – Narendra-PG line-1, and take
appropriate action including their replacement.
Annexure-II
Page 34 of 36
69/I/1 Complete outage of 400kV TPCIL
station
25-10-2017 at 19:33
hrs
400 kV TPCIL-Nellore PS line-1 got tripped from TPCIL end
during fault in 400kV Nellore-Nellore PS line-2. Running units
at TPCIL got tripped due to loss of evacuating line. 400kV
Nellore PG - Nellore PS line-2 and 400kV TPCIL - Nellore PS
line-1 were under shutdown.
TPCIL to configure DEF protection such that it remains in
blocked condition as long as Distance Protection is active,
and becomes active only when distance protection does not
pickup.
TPCIL Review Meeting on 21.12.2018:
It was noted that no TPCIL representatives had come to attend the meeting
Pending
72/III/5 Tripping of 400 kV HNPCL - K.V.
Kota line
02-02-2018 at 11:46
hrs
Tripped due to R-phase to ground fault. Line did not reclose
at HNPCL.
1. HNPCL to configure DEF protection such that it remains in
blocked condition as long as Distance Protection is active,
and becomes active only when distance protection does not
pickup.
2. HNPCL to ensure healthiness of A/R scheme implemented
on all 400 kV lines at their station.
HNPCL APTRANSCO maild ated 24.04.2018 & 24.05.2018:
To be attended by HNPCL
HNPCL maild ated 12.05.2018:
1 --- Pending
2.CB close interlock gone to “self-check Fault” state during the AR cycle. Due to that AR gone to
lockout state. Breaker open state CB close interlock should be satisfied condition.Accordingly
the logic has been modiified. ---- Pending
Review Meeting on 21.12.2018:
It was noted that no HNPCL representatives had come to attend the meeting
Pending
75/II/2 Tripping of 400kV Hinduja-
K.V.Kota line-2
01-05-2018
at 10:12 hrs
Line-2 tripped on Direct Trip receipt at KV Kota end. At the
same time there was an un-successful auto-reclose attempt
in line-1 due to persistent fault in B-phase.
1) HNPCL to attend PCSC meetings regularly esp. when
tripping events relating to their plant are included in the
Agenda.
2) HNPCL to follow the stipulated File Naming Nomenclature
for naming various tripping files being uploaded in TMS
portal of SRLDC.
3)HNPCL to sort out A/R related issues on 400 kV HNPCL – KV
Kota D/C lines, and put A/R into service from HNPCL end.
4)HNPCL to furnish a detailing tripping report of the event
including remedial measures taken to prevent their
recurrence.
5)HNPCL to configure DR’s & EL’s various protection relays at
the plant to record all mandated protections.
HNPCL Review Meeting on 21.12.2018:
It was noted that no HNPCL representatives had come to attend the the meeting
Pending
78/II/2 Tripping of 400 kV Neyveli
TS2Exp -Pugalur line
01-08-2018
at 11:56 hrs
Triggering incident was failure of R-ph tension insulator
string/ flashover in 400 kV Bus-1 at NLC TS2Exp end. Busbar
protection had operated resulting in tripping of all main
breakers connected to 400kV Bus-1 at Neyveli TS2 Exp. In
400kV NLC TS2Exp - Pugalur line, fault was sensed in Zone-1,
R-N at Pugalur end resulting in a single phase trip. Direct Trip
was received at Pugalur end due to operation of over voltage
Stg-2 at NLC TS2Exp.
1. NLCIL to furnish a report along with a suitable SLD on the
tripping event explaining the observed discrepancies [DPR,
Z1 operation, instantaneous operation of OVR-II operation],
and remedial action taken to attend the same.
2. NLCIL to configure DR’s & EL’s of all protection relays at
their NLC TS-IIExp station for all mandated protections &
signals.
NLCIL Review Meeting on 21.12.2018:
NLCIL was asked to furnish the status of implementation of the recommendation given at the
earliest.
Pending
B-phase CT failure occurred in 230 kV S.P.Koil - MAPS line-1.
Busbar protection got operated at SP.Koil station. All
elements except 230kV Oragadam and 230kV Kalivandapattu
got tripped at 230kV S.P.Koil station. ‘Y’ phase CT and
support insulators also got damaged.
1.MAPS to furnish a detailed report on the tripping of SP Koil
– MAPS lines 1 & 2 at MAPS end with focus on the
correctness of the settings of Main-I & Main-II relays (for
primary & back-up protections) on both the lines.
2.MAPS to take steps to provide down-loading facility for DR
& EL from Main-I & Main-II relays on all 230 kV lines
emanating from MAPS.
3.MAPS, in co-ordination with SP Koil, to carry out PLCC end-
to-end testing, on SP Koil – MAPS lines 1 & 2, and ensure
healthiness of PLCC communication & carrier-aided
protection.
4.MAPS to put in service Auto-Reclosure feature on all four
230 kV lines emanating from MAPS by June, 2016.
02-04-2016 at 17:08
hrs
54/I/1 Complete outage of 230 kV
S.P.Koil Station of TANTRANSCO
PendingNPCIL (MAPS) Status revided vide MAPS mail dated 06.12.2016;
1. The settings given by M/s TANTRANSCO were adopted for Main –I & Main- II relays for both
the lines. The same settings were verified to be same. Subsequently calibrated was done and
no drift was observed. --- Completed
2. From May 2016 onwards, the DR, EL and trip report are being sent by mail to SRLDC,
Bengaluru by MAPS. --- Completed
3. Monthly maintenance of PLCC equipments is being done by M/s TANTRANSCO. At present
PLCC telephone is not working, it is being followed up. --- Completed
4. CVTs are planned to be procured from M/s TANTRANSCO by the end of February 2017 and
A/R will be implemented for all the lines emanating from MAPS by July-2017 as discussed in the
current SRPC meeting on 25/11/2016. --- Pending
Status received vide MAPS mail dated 06.12.2016 & Review Meeting dated 19.12.2017;
The CVTs procurement is in progress and the scheme (A/R) would be implemented before 31-
03-2018.
Status revided vide MAPS mail dated 11.12.2018
The new CVTs were provided in all the three phases (R & B phases, CVTs were replaced and Y
ph CVT was provided) of Line-1,2 & 4. Replacement of CVTs in line-3 is in progress. Each phase
CVT supply was extended to Main 1 & Main -2 relays. Bus PT supply is extended for Sync.Check.
Time Delayed Auto Reclose (TDAR) scheme with Sync. Check, is being worked out and will be
implemented for the four lines, on by one, before 31-03-2019.
Others
Annexure-II
Page 35 of 36
79/II/8 Tripping of 400 kV NLC TS-2
(Exp) – Pugalur line
10-09-2018 at 20:57
hrs
Line tripped on B-N fault. Auto-reclose was not attempted at
Pugalur end due to DT receipt from NLC TS2Exp end. At NLC
TS2Exp end, V>2 trip was observed in DR. Analog voltages
recorded in DR were observed to be less than that required
for O/V Stage-II operation.
NLCIL to furnish a detailed report on tripping event
explaining the observed discrepancies , and proper reasons
for tripping of the line considering both the Main-relays
including remedial action taken w.r.t. healthiness/
replacement of Main protection relays on 400 kV NLC
TS2Exp–Pugalur line.
NLCIL Review Meeting on 21.12.2018:
NLCIL was asked to furnish the status of implementation of the recommendation given at the
earliest.
Pending
80/II/17 Tripping of 400 kV Nellore PS –
SGPL line-1
14-11-2018 at 20:20
hrs
Y- ph to earth fault occurred in line due to snapping of GIS to
Air bushing conductor at SGPL switchyard. The conductor got
grounded such that the fault was being fed by NPS bus and
there was earth fault and broken conductor start at SGPL
end. NPS end got tripped in Zone-2 due to non-receipt of
carrier resulting in a 3-ph trip at NPS. After 500ms, earth fault
occurred at SGPL end resulting in Zone-1 operation and 3
phase trip. A/R was not attempted at SGPL end
SGPL to examine the reasons for no-operation / failure of
Auto-reclosure from their end for the subject tripping, and
furnish an action taken report detailing remedial measures
taken to PCSC forum.
SGPL Yet to be informed Pending
80/III/6 Tripping of 400 kV Neyvelli TS2
(Exp) - Pugalur line
07-11-2018 at 05:50
Hrs
400 kV Neyvelli TS2Exp - Pugalur tripped on
B-phase to ground fault due to DPR, Z1 operation. Auto-
reclose was successful at Pugalur end and the line tripped at
Neyveli TS2Exp end only. Auto-reclose was not attempted at
Neyveli TS-2(Exp) end
NLCIL to furnish a detailed report on the reasons for A/R non-
operation for the subject tripping at their NLCTS2Exp station
including remedial measures taken to PCSC forum.
NLCIL Yet to be informed Pending
82/I/13 Tripping of 400kV Kaiga - Guttur
Ckt-2 &
400/220kV ICT-2 at Kaiga
11-02-2019
at 11:46 hrs
Bus-2 at 400kV Kaiga got de-energized due to LBB operation. NPCIL (KGS) to sort out the LBB issue in 1 months time and
to furnish a detailed report regarding the issue in LBB scheme
ad how the same has been rectified.
NPCIL (KGS) Yet to be informed Pending
82/III/11 Tripping of 400 kV KAIGA -
GUTTUR line- 1
16-02-2019 04:27
hrs
R-phase to earth fault occurred in line resulting in tripping of
line. Auto-reclose not attempted at both ends
NPCIL (KGS) to furnish a report regarding reasons for failure
of A/R at Kaiga end and remedial measures taken.
NPCIL (KGS) Yet to be informed Pending
Annexure-II
Page 36 of 36
Sl.No. Element Name Outage date/time Revival date/time Reason for outage Sender/ Receiver Remedial Measures/ Actions taken Remarks
1 400KV-SINGARENI-SUNDILA-2 17-01-2019/19:22:00MASTER TRIP
RELAY ACTEDTSGENCO/ TSTRANSCO
TSTRANSCO:
Line is under open condition at Sundilla
end. Over Voltage Stage-1 operated at
Sundilla end and DT was sent to
Singareni end.
Pending with
TSGENCO
2 400KV-NELAMANGALA-TALGUPPA-1 01-02-2019/16:56:00 01-02-2019/20:34:00DISTANCE
PROTECTIONKPTCL To-be-discussed
3 400KV/220KV HOODY-ICT-1 03-02-2019/22:25:00 04-02-2019/00:29:00AIR PRESSURE
LOWKPTCL To-be-discussed
4 HVDC 500KV KOLAR_DC Pole 07-02-2019/15:15:00 07-02-2019/16:10:00
Due to agricultural
fire / brick kiln fire
near kolar
PGCIL (SR-II) To-be-discussed
5 400KV-NELAMANGALA-HASSAN-1 11-02-2019/00:05:00TRIPPED ON R-N
FAULTKPTCL/ PGCIL (SR-II) To-be-discussed
6 220KV-KADAKOLA-KANIYAMPETTA 15-02-2019/10:30:00 15-02-2019/18:11:00TRIPPED ON Y-N
FAULTKPTCL/ KSEBL
KSEBL:
No tripping at Kanyambetta end.
Supply failed from Kadakola end. Pending with KPTCL
7 400KV-MEHBOOBNAGAR-RTPS-1 15-02-2019/11:51:00 15-02-2019/12:25:00DT received at
Veltoor endTSTRANSCO/ KPCL
TSTRANSCO:
DT received from Raichur end. Pending with KPCL
8 400KV-NELAMANGALA-TALGUPPA-1 20-02-2019/14:23:00TRIPPED ON Y-N
FAULTKPTCL To-be-discussed
9 400KV-NELAMANGALA-HIRIYUR-1 20-02-2019/11:41:00 20-02-2019/13:20:00TRIPPED ON B
PHASE FAULTKPTCL/ PGCIL (SR-II) To-be-discussed
10 400KV/110KV KAYATHAR-ICT-3 20-02-2019/02:27:00
DUE TO
DIFFERENTIAL
RELAY OPERATION
TANTRANSCO
TANTRANSCO:
R phase HV bushing and R &B phase LV
bushing failure. Internal inspection
planned.
TANTRANSCO:
R phase HV bushing and R &B phase LV
bushing failure. Internal inspection
done repair work is to be taken up.
11 400KV-KARAIKUDI-KAYATHAR-1 20-02-2019/12:21:00 20-02-2019/14:46:00B PHASE TO
GROUND FAULTPGCIL (SR-II)/ TANTRANSCO
TANTRASNCO:
Passing Fault
12 220KV-AMBEWADI-XELDEM 22-02-2019/13:47:00 22-02-2019/21:25:00TRIPPED DUE TO B-
N LINE FAULTKPTCL/ GED To-be-discussed
13 220KV-AMBEWADI-PONDA-2 24-02-2019/14:02:00TRIPPED ON R-N
FAULTKPTCL/ GED To-be-discussed
14 400KV-KOLAR_AC-THIRUVALAM-1 24-02-2019/15:18:00 24-02-2019/15:38:00 FIRE NEAR AREA PGCIL (SR-II) To-be-discussed
15 400KV-NELAMANGALA-HIRIYUR-1 24-02-2019/13:14:00 24-02-2019/14:17:00DISTANCE
PROTECTIONKPTCL/ PGCIL (SR-II) To-be-discussed
Pending Remedial Measures/ Actions taken for the Critical Tripping Incidents (as on 23.04.2019)
Annexure-III
Page 1 of 13
16 400KV-GOOTY-SOMANAHALLI-1 25-02-2019/14:30:00 25-02-2019/14:35:00 transient fault PGCIL (SR-I)/ PGCIL (SR-II)
PGCIL (SR-I): Line A/R successful at
Gooty end on R-N fault; GTY:FL-
266.5KM,FC:1.665KA.
The fault detected at Somanahalli in
Zone-2 and the fault at Gooty end
detected as High resistive fault initially
and after 578 msec & after tripping of
CBs at Somanahalli it was detected as
Zone-2 and carrier send to SMNLY as
per POR scheme.
At Gooty end distance relay operated
correctly and initiated A/R with Zone-
2+Carrier receive and A/R operated
successfully at Gooty end. Gooty end
protection operation is in order.
Pending with PGCIL
(SR-II)
17 400KV-KOLAR_AC-SOMANAHALLI-1 25-02-2019/13:32:00 25-02-2019/13:43:00 transient fault PGCIL (SR-II) To-be-discussed
18400KV-NARNOOR-SRISAILAM_LEFT_BANK-
127-02-2019/16:06:00
TRIPPED ON Y-N
FAULTAPTRANSCO/ TSGENCO
APTRANSCO: Line Patrolling was
carried out on 02/03/2019 and no
visual fault found.
Pending with
TSGENCO
19 400KV-RASIPALYAM-ANAIKADAVU-2 01-03-2019/20:37:00MASTER TRIP
RELAY ACTEDTANTRANSCO
TANTRANSCO: Defective Valiant make
(VCL-TP) protection coupler at
Anaikadavu was isolated from service.
The issue was referred to OEM.
20 220KV-KAIGA-KADRA-1 02-03-2019/10:40:00 22-03-2019/11:16:00TRIPPED ON RELAY
MAL OPERATIONTo-be-discussed
21 220KV-AMBEWADI-XELDEM 02-03-2019/14:38:00 02-03-2019/15:29:00TRIPPED ON C-N
FAULTKPTCL/ GOA To-be-discussed
22 400KV/220KV NELAMANGALA-ICT-2 02-03-2019/13:54:00 02-03-2019/14:05:00TRIPPED ON RELAY
MAL OPERATIONKPTCL To-be-discussed
23 400KV/220KV NARENDRA-ICT-1 02-03-2019/18:21:00 03-03-2019/01:44:00R-PHASE LA
FAILUREPGCIL (SR-II) To-be-discussed
24 220KV-AMBEWADI-XELDEM 02-03-2019/13:46:00 02-03-2019/14:18:00TRIPPED ON C-N
FAULTKPTCL/ GOA To-be-discussed
25 220KV-KAYAMKULAM-PUNNAORA-2 05-03-2019/00:30:00 05-03-2019/02:13:00TRIPPED ON R-N
FAULTNTPC/ KSEB
KSEBL :
Auto reclose successful at Punnapra
end, but CB tripped at NTPC,
Kayamkulam end.
Pending with NTPC
(Kayamkulam)
26 400KV-MYSORE-NELAMANGALA-1 07-03-2019/15:00:00 07-03-2019/15:10:00TRIPPED ON R-N
FAULTPGCIL (SR-II)/ KPTCL To-be-discussed
27 400KV-NELAMANGALA-TALGUPPA-1 07-03-2019/15:00:00 07-03-2019/22:53:00 R-N FAULT KPTCL To-be-discussed
28220KV-KOTHAGUDEM_TPS-
LOWER_SILERU-108-03-2019/15:02:00 08-03-2019/15:21:00
TRIPPED DUE TO B-
N LINE FAULTTSGENCO/ APGENCO
TSGENCO: Line tripped due to Y-N line
(L2-N) fault. Line charged at 15:21Hrs.
Line stood ok.
Pending with
APGENCO
Annexure-III
Page 2 of 13
29 400KV-NELAMANGALA-HIRIYUR-1 08-03-2019/09:57:00 08-03-2019/10:02:00DT received at
Nelemangala endKPTCL/ PGCIL (SR-II) To-be-discussed
30 220KV-AMBEWADI-XELDEM 08-03-2019/13:23:00 08-03-2019/13:46:00 Earth Fault KPTCL/ GED To-be-discussed
31 400KV-NELAMANGALA-TALGUPPA-1 08-03-2019/16:46:00 Y-N FAULT KPTCL To-be-discussed
32 220KV-KUNDARA-KAYAMKULAM-1 09-03-2019/12:44:00 09-03-2019/14:12:00 DT RECEIVED KSEBL/ NTPC (KYKLM)
KSEBL: 2KYKD tripped only at
Kayamkulam Substation. No tripping at
Kundara Substation End.
Pending with NTPC
(Kayamkulam)
33 230KV-TIRUNELVELI-VEERANAM-1 11-03-2019/00:55:00 Y PHASE CT BLAST TANTRANSCOCT is to be replaced in Tirunelveli
feeder 1 at Veeranam.
34 230KV-TIRUNELVELI-VEERANAM-2 11-03-2019/00:55:00 11-03-2019/02:48:00 Y PHASE CT BLAST TANTRANSCOTANTRANSCO: There is no fault in the
Veernam - Tirunelveli feeder-2
35 400KV-KAIGA-GUTTUR-2 11-03-2019/01:49:00TRIPPED ON R-N
FAULTNPCIL (KGS)/ KPTCL
NPCIL (KGS) informed that line tripped
on R-N fault due to DPR operation. LBB
Scheme is being revised. The scheme is
reviewed by designer and will be
implemented during next available
Kaiga-Guttur line-2 shutdown.
36 400KV-SINGARENI-SUNDILA-1 12-03-2019/17:03:00
BUS BAR
PROTECTION
OPERATED
TSGENCO/ TSTRANSCO
TSTRANSCO : the line tripped on Direct
Trip received indications in Main-2,
P444 relay at Ramadugu end only due
to momentary DC earth leakage.
Spurious DT signal received to Main-2,
P444 relay as OPTO signals were
configured with 24V. The OPTO signal is
now revised to 220V DC by NR service
engineer.
37 400KV-SINGARENI-SUNDILA-2 12-03-2019/17:03:00
BUS BAR
PROTECTION
OPERATED
TSGENCO/ TSTRANSCO
TSTRANSCO : the line tripped on Direct
Trip received indications in Main-2,
P444 relay at Ramadugu end only due
to momentary DC earth leakage.
Spurious DT signal received to Main-2,
P444 relay as OPTO signals were
configured with 24V. The OPTO signal is
now revised to 220V DC by NR service
engineer.
38 HVDC 500KV KOLAR_DC Pole 12-03-2019/13:02:00 12-03-2019/13:45:00 transient fault PGCIL (SR-II) To-be-discussed
39 400KV-VTPS_IV-SURYAPET-2 14-03-2019/13:52:00 14-03-2019/14:52:00TRIPPED ON R-N
FAULTAPGENCO/ TSTRANSCO To-be-discussed
40 220KV-AMBEWADI-XELDEM 15-03-2019/12:23:00 15-03-2019/17:09:00Tripped on Y-B
FaultKPTCL/ GED To-be-discussed
41 400KV-NELAMANGALA-HASSAN-1 16-03-2019/21:06:00TRIPPED ON Y-N
FAULTKPTCL/ PGCIL (SR-II) To-be-discussed
42 400KV-BPS-TUMKUR-2 17-03-2019/16:17:00 R-Y FAULT KPTCL To-be-discussed
43 400KV-BPS-YTPS-1 17-03-2019/16:17:00 R-Y FAULT KPTCL/ KPCL To-be-discussed
Annexure-III
Page 3 of 13
44 400KV-NELAMANGALA-TALGUPPA-1 18-03-2019/15:31:00TRIPPED ON B-N
FAULTKPTCL To-be-discussed
45 400KV-NELAMANGALA-HASSAN-1 18-03-2019/14:49:00 R-N FAULT KPTCL/ PGCIL (SR-II) To-be-discussed
46 400KV-BPS-YTPS-2 18-03-2019/16:17:00 18-03-2019/23:59:00 R-Y FAULT KPTCL/ KPCL To-be-discussed
47 400KV-NELAMANGALA-TALGUPPA-1 19-03-2019/17:39:00TRIPPED ON R-N
FAULTKPTCL To-be-discussed
48 220KV-AMBEWADI-PONDA-2 20-03-2019/13:14:00 20-03-2019/13:56:00Triiped on R-B
FaultKPTCL/ GED To-be-discussed
49 220KV-UDUMALPET_TN-IDDUKKI-1 21-03-2019/06:05:00 21-03-2019/11:10:00INSULATOR FLASH
OVERTANTRANSCO/ KSEBL
KSEBL: Z#2,B phase to Ground .Reason
for tripping . Reason for tripping due to
conductor decapping & tension pont
disc 14 flash over at Udumelpet area
Pending with
TANTRANSCO
50 400KV/220KV GAJWEL-ICT-4 21-03-2019/9 10:13:00 21-03-2019/13:38:00 PRV OPERATED TSTRANSCO To-be-discussed
51220KV-KOTHAGUDEM_TPS-
LOWER_SILERU-123-03-2019/11:27:00 23-03-2019/11:52:00
TRIPPED ON R-N
FAULTTSGENCO/ APGENCO To-be-discussed
52 400KV-BIDADI-TUMKUR-2 23-03-2019/14:47:00 23-03-2019/17:00:00TRIPPED ON R-Y
FAULTPGCIL (SR-II) To-be-discussed
53220KV-KOTHAGUDEM_TPS-
LOWER_SILERU-124-03-2019/12:55:00 24-03-2019/15:52:00
TRIPPED ON Y-N
FAULTTSGENCO/ APGENCO To-be-discussed
54 400KV-NELLORE_AP-VTPS_IV-1 24-03-2019/12:46:00 24-03-2019/12:58:00TRIPPED ON Y-N
FAULTAPTRANSCO/ APGENCO
APTRANSCO: "Y-Phase to ground , Zone-
1 Fault and AR Successful at Manubolu
end.
Protection operation found in order."
Pending with
APGENCO
55 400KV-NELAMANGALA-TALGUPPA-1 28-03-2019/17:38:00TRIPPED ON R-N
FAULTKPTCL To-be-discussed
56 400KV-PALAVADI-MTPS_ST_III-1 29-03-2019/06:52:00
H/T DUE TO SF6
GAS PRESSURE
LOW
PGCIL (SR-II)/ TANGEDCO To-be-discussed
57 400KV/230KV SALEM_TN-ICT-1 29-03-2019/18:14:00 29-03-2019/18:37:00HIGH WINDING
TEMPERATURETANTRANSCO To-be-discussed
58 220KV-AMBEWADI-XELDEM 30-03-2019/21:18:00 30-03-2019/22:32:00Tripped on Y-B
FaultKPTCL/ GED To-be-discussed
59 400KV-VTPS_IV-SURYAPET-2 31-03-2019/13:42:00 31-03-2019/16:41:00TRIPPED ON B-N
FAULTAPGENCO/ TSTRANSCO To-be-discussed
60 400KV-VTPS_IV-SURYAPET-1 31-03-2019/13:42:00TRIPPED ON B-N
FAULTAPGENCO/ TSTRANSCO To-be-discussed
Annexure-III
Page 4 of 13
61 400KV-RAICHUR_PG-RTPS-2 03-04-2019/19:37:00 03-04-2019/20:18:00TRIPPED ON B-N
FAULTPGCIL(SR-I)/ KPCL
PGCIL (SR-I): Tripped on B-N Fault,Fault
Current: 22.989 kA, Dist: 12.804km
(57.520%) from raichur end. 23.01Kms
& FC:8.36kA from RTPS end.
Patrolling carriedout no abnormality
found. During the tripping heavy wind
and thunders were reported at that
locations.
Pending with KPTCL
Status of operation of
A/R in the line ?
62 400KV-RTPS-BTPS-1 03-04-2019/12:36:00 03-04-2019/19:02:00TRIPPED ON Y-N
FAULTKPCL To-be-discussed
63 400KV-MAMIDAPALLI-DINDI-1 05-04-2019/20:02:00TRIPPED DUE TO
R0N FAULTTSTRANSCO To-be-discussed
64 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 05-04-2019/12:55:00 05-04-2019/19:53:00TRIPPED ON Y-N
FAULTTSGENCO/ APTRANSCO
TSGENCO: ICT-2 was not tripped, only
220KV line-4 associated with ICT-2 was
tripped from Malayalapally end, with
400KV bus-2 fault at RSTPS end. From
RSTPS end Line was in charged
condition.
Pending with
APTRANSCO
65 220KV-AMBEWADI-PONDA-2 05-04-2019/01:11:00TRIPPED ON Y-N
FAULTKPTCL To-be-discussed
66 400KV/220KV RAMAGUNDAM-ICT-2 05-04-2019/19:56:00 05-04-2019/23:26:00
BUS BAR
PROTECTION
OPERATED
NTPC To-be-discussed
67 400KV-NELAMANGALA-HASSAN-1 06-04-2019/17:32:00TRIPPED ON Y-N
FAULTKPTCL/ PGCIL (SR-II) To-be-discussed
68 400KV-MAMIDAPALLI-DINDI-1 06-04-2019/17:37:00 06-04-2019/20:53:00
R Phase distance
protection
operated
TSTRANSCO To-be-discussed
69 400KV-SRISAILAM_LEFT_BANK-DINDI-1 06-04-2019/17:39:00TRIPPED ON R-N
FAULTTSGENCO/ TSTRANSCO To-be-discussed
70400KV-NARNOOR-SRISAILAM_LEFT_BANK-
108-04-2019/16:11:00 08-04-2019/19:45:00
TRIPPED ON R-N
FAULTAPTRANSCO/ TSGENCO To-be-discussed
71 400KV-NARNOOR-JAMMALAMADUGU-1 08-04-2019/16:12:00 08-04-2019/17:08:00TRIPPED ON B-N
FAULTAPTRANSCO To-be-discussed
72 400KV-NARNOOR-JAMMALAMADUGU-2 08-04-2019/16:12:00 08-04-2019/17:13:00TRIPPED ON B-N
FAULTAPTRANSCO To-be-discussed
73400KV-SRISAILAM_LEFT_BANK-
SATTENPALLI08-04-2019/15:05:00
TRIPPED ON R-N
FAULTTSGENCO/ APTRANSCO To-be-discussed
74 400KV-KAIGA-GUTTUR-1 08-04-2019/16:50:00TRIPPED ON R-Y
FAULTNPCIL / KPTCL To-be-discussed
75 400KV-GUTTUR-HIRIYUR-1 08-04-2019/14:28:00 08-04-2019/14:57:00TRIPPED ON Y-N
FAULTKPTCL/ PGCIL (SR-II) To-be-discussed
76 400KV-HOSUR-SALEM-2 08-04-2019/17:55:00 08-04-2019/20:18:00Triiped on R-B
FaultPGCIL (SR-I) To-be-discussed
Annexure-III
Page 5 of 13
77 765KV-RAICHUR_PG-SHOLAPUR-2 08-04-2019/11:16:00 08-04-2019/11:41:00TRIPPED ON R-N
FAULTPGCIL (SR-I)
PGCIL (SR-I): Line tripped on R-N
Fault(RCN End : FC-4.341Km, FD-
126.187Km . Protection operation is in
olrder. Solaphur End : FC-5.12KA FD-
86.701). Line belonga to M/s RSTCPL .
Status of A/ R in line?
78 220KV-KADAKOLA-KANIYAMPETTA 08-04-2019/22:48:00 09-04-2019/01:10:00HEAVY WIND AND
LIGHTETINGKPTCL/ KSEB
KSEBL: Not tripped at Kaniyambetta
end as the feeder was radial from
Kadakola and CB open at Areekode
end.
Pending with KPTCL
79 220KV-SHORNUR-AREACODE-1 10-04-2019/23:06:00 11-04-2019/00:21:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
80 400KV-SRISAILAM_LEFT_BANK-DINDI-1 10-04-2019/18:13:00 10-04-2019/19:58:00TRIPPED ON R-N
FAULTTSGENCO/ TSTRANSCO To-be-discussed
81 400KV-BPS-YTPS-2 10-04-2019/19:40:00TRIPPED ON R-N
FAULTKPTCL/ KPCL To-be-discussed
Annexure-III
Page 6 of 13
82 220KV-MALAPARAMBA-AREACODE-1 10-04-2019/23:06:00 11-04-2019/00:11:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
83 220KV-MADAKATHARA-AREACODE-1 10-04-2019/23:06:00 10-04-2019/23:59:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
Annexure-III
Page 7 of 13
84 220KV-KOZHIKODE-AREACODE-1 10-04-2019/23:06:00 10-04-2019/23:42:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
85 220KV-AREACODE-NALLALAM-2 10-04-2019/23:06:00 10-04-2019/23:45:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
Annexure-III
Page 8 of 13
86 220KV-AREACODE-NALLALAM-1 10-04-2019/23:06:00 10-04-2019/23:44:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
87 220KV-KOZHIKODE-AREACODE-2 10-04-2019/23:06:00 10-04-2019/23:56:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
Annexure-III
Page 9 of 13
88 220KV-AREACODE-KANHIRODE-1 10-04-2019/23:06:00 10-04-2019/23:52:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
89 220KV-KOZHIKODE-AREACODE-3 10-04-2019/23:06:00 11-04-2019/03:31:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
90 400KV-MUNIRABAD-RTPS-1 10-04-2019/15:52:00 10-04-2019/16:05:00 DT RECEIVED PGCIL (SR-I)/ KPCL
PGCIL (SR-I): Line tripped on DT receipt
from RTPS end. While availing the line
S/D on RTPS-Velatoor line during the
opening of CBs of RTPS-Velatoor line at
RTPS due to wrong configuration DT
send to Munirabad end from RTPS.
Protection belongs to M/s KPCL.
Annexure-III
Page 10 of 13
91 220KV-AREACODE-VADAKARA-1 10-04-2019/23:06:00 11-04-2019/00:01:00
BUS BAR
PROTECTION
OPERATED
KSEB
KSEBL : KSEBL: High impedance Bus bar
protection operatrd at Areekode 220
KV substation and all three zones
tripped. But BBP trip relays acted only
in 2KZAR1, 2KZAR 2 and 2KZAR 3.
2ARKN and 160 Mva Transformer under
switched off condition prior to the
fault. 220 KV feeders 2SHAR and
2MDAR tripped at both ends on
distance protection. Other feeders
switched off from Areekode. The non
tripping of BBP trip relays under
investigation(Detailed report will be
submitting soon) . The old High
Impedance BBP is under replacement
by Low impedance GE make panel. PO
issued .
92 220KV-SULURPET-GUMMIDIPOONDI-1 11-04-2019/16:05:00 11-04-2019/17:01:00TRIPPED DUE TO B-
N LINE FAULTTANTRANSCO To-be-discussed
93 400KV-TALARCHEVU-URAVAKONDA-2 11-04-2019/20:11:00TRIPPED ON B-N
FAULTAPTRANSCO To-be-discussed
94400KV-TALARCHEVU-JAMMALAMADUGU-
111-04-2019/20:11:00 11-04-2019/22:00:00
TRIPPED ON B-N
FAULTAPTRANSCO To-be-discussed
95 400KV-HINDUJA-KV_KOTA-2 11-04-2019/09:40:00 11-04-2019/11:08:00TRIPPED ON Y-N
FAULTHNPCL/ APTRANSCO To-be-discussed
96 220KV-CHITTOOR_AP-THIRUVALAM_TN-1 11-04-2019/16:42:00 11-04-2019/22:28:00TRIPPED ON Y-N
FAULTAPTRANSCO/ TANTRANSCO To-be-discussed
97 220KV-CHITTOOR_AP-THIRUVALAM_TN-1 11-04-2019/10:59:00 11-04-2019/16:11:00TRIPPED ON B-N
FAULTAPTRANSCO/ TANTRANSCO To-be-discussed
98 400KV-VALLUR-ALAMATHY-1 11-04-2019/02:45:00 11-04-2019/04:45:00TRIPPED ON Y-N
FAULTNTECL/ TANTRANSCO To-be-discussed
99400KV-SRISAILAM_LEFT_BANK-
SATTENPALLI11-04-2019/14:28:00
TRIPPED ON Y-N
FAULTTSGENCO/ APTRANSCO To-be-discussed
100 400KV-NARNOOR-JAMMALAMADUGU-2 12-04-2019/10:13:00 12-04-2019/16:26:00TRIPPED ON B
PHASE FAULTAPTRANSCO To-be-discussed
101 400KV-KHAMMAM-ASUPAKA-1 13-04-2019/13:26:00 13-04-2019/18:29:00TRIPPED ON B-N
FAULTPGCIL (SR-I)/ TSTRANSCO To-be-discussed
102 400KV-URAVAKONDA-MEHBOOBNAGAR-1 13-04-2019/18:36:00TRIPPED ON Y-N
FAULTAPTRANSCO/ TSTRANSCO To-be-discussed
103 400KV-KHAMMAM-ASUPAKA-1 14-04-2019/13:14:00 14-04-2019/19:35:00TRIPPED ON B-N
FAULTPGCIL (SR-I)/ TSTRANSCO To-be-discussed
104 400KV-SIMHADRI_STG2-VEMAGIRI_AP-1 15-04-2019/17:58:00 15-04-2019/23:10:00 LA FAILURE NTPC/ APTRANSCO To-be-discussed
105 400KV-SURYAPET-JULURUPADU-2 15-04-2019/06:49:00TRIPPED ON B
PHASE FAULTTSTRANSCO To-be-discussed
Annexure-III
Page 11 of 13
106 400KV-CHITTOOR-KRISHNAPATNAM-1 15-04-2019/16:36:00 15-04-2019/17:03:00
H/T DUE TO SF6
GAS PRESSURE
LOW
APTRANSCO To-be-discussed
107 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 15-04-2019/14:01:00 15-04-2019/22:03:00TRIPPED DUE TO B-
N LINE FAULTTSGENCO/ APTRANSCO To-be-discussed
108 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 15-04-2019/13:20:00 15-04-2019/14:00:00TRIPPED ON Y-N
FAULTTSGENCO/ APTRANSCO To-be-discussed
109 132KV-KONAJE-MANJESWAR-1 15-04-2019/16:36:00 15-04-2019/16:55:00
Tripped on over
current (Due to
traction load)
KPTCL To-be-discussed
110 400KV-VTPS_IV-SURYAPET-2 15-04-2019/14:24:00 15-04-2019/15:19:00TRIPPED ON Y-N
FAULTAPGENCO/ TSTRANSCO To-be-discussed
111 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 16-04-2019/14:04:00 16-04-2019/14:30:00TRIPPED ON B-N
FAULTTSGENCO/ APTRANSCO To-be-discussed
112 400KV-NARNOOR-GHANI-2 17-04-2019/16:53:00 17-04-2019/21:06:00Tripped on R-B
FaultAPTRANSCO To-be-discussed
113 400KV-GOOTY-SOMANAHALLI-1 FSC 17-04-2019/11:16:00
To reduce power
flow of attend near
Somanhalli end.
PGCIL (SR-II) To-be-discussed
114 765KV/440KV KURNOOL_PG-ICT-2 17-04-2019/16:53:00 17-04-2019/17:11:00
TRIPPED ON
BUCCHOLZ RELAY
OPERATION
PGCIL (SR-I) To-be-discussed
115 400KV-RAMAGUNDAM-WARANGAL-1 17-04-2019/16:49:00TRIPPED ON R-N
FAULTPGCIL(SR-I)/ NTPC To-be-discussed
116 400KV-MYSORE-KOZHIKODE-1 17-04-2019/17:18:00 17-04-2019/17:36:00TRIPPED ON B-N
FAULTPGCIL (SR-II) To-be-discussed
117 400KV-MALKARAM-RAMAGUNDAM-1 17-04-2019/15:59:00 17-04-2019/16:40:00TRIPPED ON B-N
FAULTTSTRANSCO/ NTPC To-be-discussed
118 400KV-RAYALSEEMA TPP-KALIKIRI-1 17-04-2019/15:06:00 17-04-2019/22:00:00TRIPPED ON R-N
FAULTAPGENCO/ APTRANSCO To-be-discussed
119 220KV-YERRAANDAHALLI-HOSUR_TN-1 17-04-2019/15:23:00 17-04-2019/21:28:00TRIPPED ON B-N
FAULTKPTCL/ TANTRANSCO To-be-discussed
120220KV-NAGARJUNASAGAR_AP-
NAGARJUNASAGAR17-04-2019/15:54:00
TRIPPED ON B-N
FAULTAPTRANSCO/ TSTRANSCO To-be-discussed
121220KV-NAGARJUNASAGAR_AP-
NAGARJUNASAGAR17-04-2019/15:54:00 17-04-2019/17:08:00
Tripped on Y-B
FaultAPTRANSCO/ TSTRANSCO To-be-discussed
122 400KV-GHANAPUR-RAMAGUNDAM-4 17-04-2019/16:13:00 17-04-2019/17:28:00Tripped on Y-B
FaultPGCIL(SR-I)/ NTPC To-be-discussed
123 400KV/220KV MADAKKATHARA-ICT-3 18-04-2019/21:20:00 18-04-2019/23:18:00
BUS BAR
PROTECTION
OPERATED
KSEBL To-be-discussed
124 400KV-DONI-GUTTUR-1 18-04-2019/18:59:00 CB FLASHOVER KPTCL To-be-discussed
125 400KV-MAMIDAPALLI-KHAMMAM-2 18-04-2019/17:46:00DISTANCE
PROTECTIONTSTRANSCO/ PGCIL (SR-I) To-be-discussed
126400KV-GHANAPUR-MAHESHWARAM_PG-
119-04-2019/16:59:00 19-04-2019/17:44:00
TRIPPED ON B-N
FAULTPGCIL (SR-I) To-be-discussed
Annexure-III
Page 12 of 13
127 400KV-KAYATHAR-KANARPATTI-1 20-04-2019/15:23:00 20-04-2019/16:03:00DT Recieved at
Kanarpaty endTANTRANSCO To-be-discussed
128 765KV-SRIKAKULAM-VEMAGIRI_PG-1 20-04-2019/17:30:00 20-04-2019/17:35:00TRIPPED ON B-N
FAULTPGCIL (SR-I) To-be-discussed
129 400KV-KAYATHAR-KANARPATTI-2 20-04-2019/15:23:00 20-04-2019/16:23:00DT Recieved at
Kanarpaty endTANTRANSCO To-be-discussed
130 400KV-PALAKKAD-TRICHUR-1 20-04-2019/13:09:00 20-04-2019/13:30:00
TRIPPED ON
SINGLE PHASE TO
GND FAULT
PGCIL (SR-II) To-be-discussed
131 400KV-KHAMMAM-WARANGAL-1 20-04-2019/14:45:00 20-04-2019/14:56:00
TRIPPED ON
SINGLE PHASE TO
GND FAULT
PGCIL (SR-I) To-be-discussed
132400KV-SRISAILAM_LEFT_BANK-
SATTENPALLI20-04-2019/16:33:00
TRIPPED ON
SINGLE PHASE TO
GND FAULT
TSGENCO/ APTRANSCO To-be-discussed
133 400KV-MARADAM-KALPAKKA-2 20-04-2019/19:00:00 20-04-2019/23:48:00
TRIPPED ON
SINGLE PHASE TO
GND FAULT
APTRANSCO To-be-discussed
134 220KV-KADAKOLA-KANIYAMPETTA 20-04-2019/20:21:00 20-04-2019/20:41:00TRIPPED DUE TO B-
N LINE FAULTKPTCL/ KSEBL To-be-discussed
135 220KV-UDUMALPET_TN-IDDUKKI-1 20-04-2019/20:27:00 20-04-2019/23:15:00RELAY
MALOPERATIONTANTRANSCO/ KSEBL To-be-discussed
136400KV-MAHESHWARAM_TG-
SHANKARAPALLI20-04-2019/16:51:00
TRIPPED ON Y-N
FAULTTSTRANSCO To-be-discussed
137 400KV-NARNOOR-GHANI-1 21-04-2019/18:13:00TRIPPED ON B
PHASE FAULTAPTRANSCO To-be-discussed
138 400KV/220KV GHANI-ICT-1 21-04-2019/18:13:00 21-04-2019/21:12:00
H/T DUE TO
INSULATOR
TRACKING
APTRANSCO To-be-discussed
139 400KV/220KV MEHBOOBNAGAR-ICT-3 22-04-2019/16:23:00 22-04-2019/20:43:00RESTRICTED EARTH
FAULTTSTRANSCO To-be-discussed
140 400KV-NCTPS_STAGE_II-VALLUR-2 22-04-2019/00:38:00INSULATOR
TRACKINGTANGEDCO/ NTECL To-be-discussed
141 400KV-HINDUJA-KV_KOTA-2 22-04-2019/20:48:00TRIPPED ON R-N
FAULTHNPCL/ APTRANSCO To-be-discussed
142 400KV/220KV DICHPALLY-ICT-2 22-04-2019/17:22:00 22-04-2019/20:20:00RESTRICTED EARTH
FAULTAPTRANSCO To-be-discussed
143 400KV/220KV DICHPALLY-ICT-3 22-04-2019/17:22:00 22-04-2019/20:26:00RESTRICTED EARTH
FAULTAPTRANSCO To-be-discussed
Annexure-III
Page 13 of 13
SL.NO SS NAME OWNERSLD prepared by
PRDC
Utilities
responded to
SLDs
finalized or not
1 DONKARAYI PH_GS APGENCO yes
2
HAMPI PH_GS APGENCO
Basic SLD is yes.
Protection is not
modeled as
Protection SLD is
not available.
3 LOWER SILERU PH_GS APGENCO yes
4 MACHKUND PH_GS APGENCO yes
5 NAGARAJUNASAGAR TAILPOND PH_GS APGENCO yes
6 NAGARJUNASAGAR RIGHT CANAL PH_GS APGENCO yes
7 NTTPS_GS APGENCO yes (2 drawings)
8 RTPP APGENCO yes (2 drawings)
9 SDSTPS_GS APGENCO yes
10 SRISAILAM RIGHT BANK PH SS APGENCO yes
11 TUNGA BHADRA PH_GS APGENCO yes
12 UPPER SILERU PH_GS APGENCO yes
13 PENNA AHOBILAM_GS APGENCO yes
14 SRISAILAM RIGHT BANK PH_GS APGENCO yes
15 GODAVARI GAS PP JEGURUPAD PHASE-1_GS APEPDL yes
16 GALIVEDU PHASE-1 APSPCL yes
17 GALIVEDU PHASE-2 APSPCL yes
18 NP KUNTA APSPCL yes
19 VIJESWARAM STAGE-1_GS APGPCL yes yes
20 VIJESWARAM STAGE-2_GS APGPCL yes yes
21 ANANTAPUR APTRANSCO yes
22 ANRAK APTRANSCO yes
23 AP CARBIDES APTRANSCO yes
24 BHIMADOLE APTRANSCO yes
25 BILAKALAGUDURU APTRANSCO yes
26 BOBBILI GROWTH CENTER APTRANSCO yes
27 BOKSAMPALLI APTRANSCO yes
28 BOMMURU APTRANSCO yes
29 BORAMPALLI APTRANSCO yes
30 BOYAREDDY PALLI APTRANSCO yes
31 BRAHMADEVA PALEM APTRANSCO yes
32 BRAHMANAKOTKURU APTRANSCO yes
33 BRANDIX APTRANSCO yes
34 CHAKRAYAPETA APTRANSCO yes
35 CHILLAKALLU APTRANSCO yes
36 CHINAKAMPALLI APTRANSCO yes
37 CHITTOOR SS APTRANSCO yes
38 DAIRY FARM APTRANSCO yes
39 DHONE APTRANSCO yes
40 DUVVA APTRANSCO yes
41 GADDAVARIPALLI APTRANSCO yes
42 GAJUWAKA APTRANSCO yes
43 GAMESHA RENEWABLE Pvt Ltd_GS APTRANSCO yes
44 GANGAVARAM APTRANSCO yes
45 GARIVIDI APTRANSCO yes
46 GHANI APTRANSCO yes
47 GODDUMARI APTRANSCO yes
48 GOLLAPURAM APTRANSCO yes
49 GOOTY APTRANSCO yes yes
50 GOOTY SWS APTRANSCO yes
51 GOOTY(RTSS) APTRANSCO yes
52 GUDIVADA APTRANSCO yes
53 GUNADALA APTRANSCO yes
54 HINDUPUR APTRANSCO yes
55 JAMMALAMADUGU 400KV APTRANSCO yes
56 KADAPA SS APTRANSCO yes yes
57 KAKINADA APTRANSCO yes
58 KALAPAKA APTRANSCO yes
59 KALIKIRI 400KV APTRANSCO yes
60 KALIKIRI SS APTRANSCO yes
61 KALYANDURGA APTRANSCO yes
62 KAMAVARAPOKOTA_220 APTRANSCO yes
63 KAMAVARAPOKOTA_400 APTRANSCO yes
64 KAMBALAPADU APTRANSCO yes
65 KODURU APTRANSCO yes
66 KONDAPALLI APTRANSCO yes
67 KONDAPURAM APTRANSCO yes
68 KRISHNAGIRI APTRANSCO yes
69 KUPPAM APTRANSCO yes
70 LAKKASAGARAM APTRANSCO yes
71 MADANAPALLE APTRANSCO yes
72 MAHADEVA MANGALAM APTRANSCO yes
73 MALYALA APTRANSCO yes
Status of Confirmation of Orderliness of Protection SLD's of Andhra Pradesh
Annexure-IV
Page 1 of 18
74 MANUBOLU_400kV APTRANSCO yes
75 MARADAM APTRANSCO yes
76 MARKAPUR APTRANSCO yes
77 MUCHUMARI APTRANSCO yes
78 MYDUKUR APTRANSCO yes
79 MYTHRA VAYU Pvt Ltd_GS APTRANSCO yes
80 NAGARI APTRANSCO yes
81 NANDYALA APTRANSCO yes
82 NANSURALLA APTRANSCO yes
83 NARASARAOPET APTRANSCO yes
84 NARNOOR APTRANSCO yes
85 NELLORE APTRANSCO yes yes
86 NIDADAVOLU APTRANSCO yes
87 NUNNA APTRANSCO yes
88 ONGOLE APTRANSCO yes
89 PALAMANERU APTRANSCO yes
90 PALLANTLA APTRANSCO yes
91 PARUCHUR APTRANSCO yes
92 PARWADA APTRANSCO yes
93 PENDURTHY APTRANSCO yes
94 PODILI APTRANSCO yes
95 PORUMAMILLA APTRANSCO yes
96 PULIVENDULA APTRANSCO yes
97 RACHAGUNNERI APTRANSCO yes
98 RAJAMPETA APTRANSCO yes
99 RAMAGIRI APTRANSCO yes
100 RAMPOCHADAVARAM APTRANSCO yes
101 REGULAPADU APTRANSCO yes
102 RENIGUNTA APTRANSCO yes
103 RENTACHINTALA APTRANSCO yes
104 SAMALKOT APTRANSCO yes
105 SATTENAPALLY APTRANSCO yes
106 SETTIPALLY APTRANSCO yes
107 SHAPURAM APTRANSCO yes
108 SOMAYAJULAPPALLY APTRANSCO yes
109 SUBBARAYUNIPALLI APTRANSCO yes
110 SULURPETTA APTRANSCO yes
111 TADIKONDA APTRANSCO yes
112 TADIPADRI APTRANSCO yes
113 TALLEPALLY APTRANSCO yes
114 TEKKALI APTRANSCO yes
115 THIMMAPURAM APTRANSCO yes
116 THIMMAPURAM CHITTOOR APTRANSCO yes
117 UNDI APTRANSCO yes
118 URAVAKONDA APTRANSCO yes
119 VAJRAKARUR APTRANSCO yes
120 VEMAGIRI APTRANSCO yes
121 VIZAG SWITCHING STATION APTRANSCO yes
122 YELLANUR APTRANSCO yes
123 YERRAGUNTLA APTRANSCO yes
124 GOOTHY(PGCIL) PGCIL (SR-I) yes
125 KADAPA PGCIL PGCIL (SR-I) yes
126 KURNOOL PGCIL PGCIL (SR-I) yes yes
127 MANUBOLU_PG_400kV PGCIL (SR-I) yes
128 MANUBOLU_PG_765kV PGCIL (SR-I) yes
129 NP KUNTA PGCIL PGCIL (SR-I) yes yes
130 SRIKAKULAM_PG PGCIL (SR-I) yes yes
131 VEMAGIRI PG PGCIL (SR-I) yes yes
132 VIJAYAWADA_PG PGCIL (SR-I) yes yes
133 VISAKHAPATNAM_PGCIL PGCIL (SR-I) yes yes
134 KADAPA GIS PGCIL (SR-I) Visited recently
135NP KUNTA SOLAR NTPC
Modeled in GUI
17
136 NTPC SIMHADRI_GS NTPC yes
137 HINDUJA NATIONAL POWER LTD(HNPCL)_GS HNPCL yes Yes
138 LANCO_GS LANCO yes yes
139SEIL_GS
SEMCORP ENERGY INDIA
LIMIDEDyes
140SGIL_GS
SEMCORP GAYATRI POWER
LIMIDEDyes
141 ANIMALA_WIND GREENKO yes
142 ANRAK ALUMINIUM LTD ANRAK ALUMINIUM LTD yes
143AXIS WIND FARMS
AXIS ENERGY VENTURE IND
PVT.LTDyes
144AZURE POWER INFASTRUTURE PVT LTD
AZURE POWER INFASTRUTURE
PVT LTDyes
145 ECOREN WIND ENERGY ECOREN ENERGY IND PVT LTD yes
146 ECORON ENERGY INDIA PVT LTD RENEW POWER LTD yes
147 ELLUTLA(SUZLON)_GS RENEW POWER LTD yes
148 GAMESA WIND_GS GAMESA yes
149 GANI SOLAR PARKS 1_GS GREENKO yes
Annexure-IV
Page 2 of 18
150 GANI SOLAR PARKS 2_GS GREENKO yes
151 GANI SOLAR PARKS 3_GS ADANI yes
152 GANI SOLAR PARKS 4_GS ADANI yes
153GIRIJA ALLOY & POWER INDIA LTD_GS
GIRIJA ALLOY & POWER INDIA
LTDyes
154 GMR BARGE MOUNTED_GS GMR ENERGY yes
155 GMR VEMAGIRI_GS GMR ENERGY yes
156 GREENKO ENERGIES PRIVATE LTD_GS GREENKO yes
157 GVK GAUTAMI_GS GVK INDUSTRIES LTD yes
158 GVK JEGURUPAD PHASE-2_GS GVK INDUSTRIES LTD yes
159 HELIOUS INFRATECH PVT LTD_GS HELIOUS INFRATECH PVT LTD yes
160 HERO FUTURE ENERGIES_GS HERO FUTURE ENERGIES yes
161
INDIAN RAILWAY TRACTION_GOOTY INDIAN RAILWAY
SLD not modeled
as traction station
protection
modeling is under
implementation in
MiPSCT
162
INDIAN RAILWAY TRACTION_RAJAMPET INDIAN RAILWAY
SLD not modeled
as traction station
protection
modeling is under
implementation in
MiPSCT
163 JSW CEMENT LTD JSW yes
164KORUKONDA
MEGA ENGINEERS &
INFRASTRUCTURES LTDyes
165 MEPL_GS MEENAKSHI ENERGY LIMITED yes
166PATTISEEMA
MEGA ENGINEERS &
INFRASTRUCTURES LTDyes
167 POLY&JED PSS GREENKO yes
168PURUSHOTHAPATNAM WATER RESOURCE DEPARTMENT yes
169 RAIN CII CARBON LTD_GS RAIN CII CARBON LTD yes
170RAMAVARAM
MEGA ENGINEERS &
INFRASTRUCTURES LTDyes
171RAYALA_GS
RAYALA WIND POWER
COMPANY PRIVATE LTDyes
172 REGEN O&M SERVICES_GS REGEN POWER yes
173 SAIPURAM WIND ENERGY_RE GREENKO yes
174SAMALKOT POWER STATION_GS RELIANCE INFRASTUCTURE LTD yes
175 SARDA METAL& ALLOYS LTD_GS SARDA METAL& ALLOYS LTD yes
176 SIEMENS GAMESHA RENEWABLE PVT LTD GREENKO yes
177SIMHAPURI_GS
SIMHAPURI ENERGY PRIVATE
LIMITEDyes
178SPECTRUM POWER _GS
SPECTRUM POWER GENERATION
LTDyes
179SUZLON ENERGY LTD_GS
SUZLON POWER
INFRASTRUCTURE LTDyes
180SUZLON GLOBAL SERVICE_GS
SUZLON POWER
INFRASTRUCTURE LTDyes
181SUZLON INFRASTRUCTURE PVT LTD_GS
SUZLON POWER
INFRASTRUCTURE LTDyes
182THETA ENERGY PVT LTD
SUZLON POWER
INFRASTRUCTURE LTDyes
183
ULTRATECH CEMENT LTD ULTRATECH CEMENT LTD
Basic SLD is
attached.
Protection is not
modeled as CT
details are not
available.
184 VIZAG STEEL PLANT_GS CPSE yes
185 WIND WORLD INDIA LTD_GS WIND WORLD INDIA LTD yes
186
HINDUSTAN PETROLEUM (HPCL) HPCL
Substation is not
visited as we were
unable to get
contact details for
sending
permission letter.
Annexure-IV
Page 3 of 18
187
ESSAR STEEL LTD ESSAR STEEL
Substation is not
visited as we were
unable to get
contact details for
sending
permission letter.
188 A.P. PAPER MILLS A.P. PAPER MILLS Visited recently
189
SILK ROAD SUGARS SILK ROAD SUGARS
Substation is not
visited as the
capacity is less
than 25MW
190 JAIPORE SUGARS LTD JAIPORE SUGARS LTD Visited recently
191
VRK SUGARS LTD. VRK SUGARS LTD.
Substation is not
visited as the
capacity is less
than 25MW
192BHARATHI CEMENTS, NALLALINGAYA PALLI
BHARATHI CEMENTS,
NALLALINGAYA PALLI Visited recently
193 WANEEP SOLAR WANEEP Visited recently
194ANDRA SUGARS
ANDHRA SUGARS CHEMICAL &
FERTILISERS Visited recently
Indicates SLD is submitted by utility . PRDC yet to
provide SLD
Nellore 400kV? and Nellore Pooling Station?
Kurnool? And Narnoor?
Annexure-IV
Page 4 of 18
SL. NO. SS NAMESLD prepared by
PRDC
Utilities responded
to SLDsfinalized or not
1 RTS-B_GS TSGENCO yes yes
2 KAKATHIYA THERMAL PP_GS TSGENCO yes yes
3 AMRP LIFT IRIGATION TSGENCO yes
4 AMRP LOW LEVEL CANEL _PUMP HOUSE TSGENCO yes
5 SRISAILAM LEFT BANK PP_GS TSGENCO yes yes
6 KOTHAGUDEM THERMAL PS _GS TSGENCO yes yes
7 KOTHAGUDEM THERMAL PS-5&6_GS TSGENCO yes yes
8 NAGARJUN SAGAR MAIN PH TSGENCO yes yes
9 PULICHINTALA_GS TSGENCO yes yes
10 NAGARJUN SAGAR LEFT CANEL TSGENCO yes
11 RECEIVING STATION-NAGARJUNA SAGAR TSGENCO yes yes
12 SINGUR DAM_ GS TSGENCO yes yes
13 NIZAM SAGAR_GS TSGENCO yes yes
14 POCHAMPAD_GS TSGENCO yes yes
15 LOWER JURALA_GS TSGENCO yes yes
16 UPPER JURALA_GS TSGENCO yes yes
17 DURSHED TSTRANSCO Yes
18 RSS(MALYALPALLY) TSTRANSCO Yes
19 SIRICILLA TSTRANSCO Yes
20 BOMMAKAL TSTRANSCO Yes
21 MEDARAM TSTRANSCO Yes
22 HUZURABAD TSTRANSCO Yes
23 JAGTIAL TSTRANSCO Yes
24 MURMUR TSTRANSCO Yes
25 VEMENURU TSTRANSCO Yes
26 MANDAMARI TSTRANSCO Yes yes
27 MANTHANI TSTRANSCO Yes
28 JULURUPADU TSTRANSCO Yes
29 ASUPAKA TSTRANSCO Yes
30 BUDIDAMPADU TSTRANSCO Yes
31 MANAGURU TSTRANSCO Yes
32 WARANGAL TSTRANSCO Yes
33 NAGARAM TSTRANSCO Yes
34 WADDEKOTHAPALLY TSTRANSCO Yes
35 MALLARAM TSTRANSCO Yes
36 MAHABUBABAD TSTRANSCO Yes
37 GANGARAM TSTRANSCO Yes
38 BHEEMAGHANPUR TSTRANSCO Yes
39 NARKEPALLY TSTRANSCO Yes
40 KM PALLY TSTRANSCO Yes
41 MIRGALEGUDA TSTRANSCO Yes
42 CHALAKARTHY TSTRANSCO Yes
43 BHONGIR TSTRANSCO Yes
44 SALIVAGU TSTRANSCO Yes
45 SEETHARAMPATTINAM TSTRANSCO Yes
46 HIAL TSTRANSCO Yes
47 FAB CITY TSTRANSCO Yes
48 SHAMSHABAD TSTRANSCO Yes
49 BONGLOOR TSTRANSCO Yes
50 MAMIDIPALLY TSTRANSCO Yes
51 MAHESHWARAM TSTRANSCO Yes
52 SURYAPET TSTRANSCO Yes
53 SITHAPURAM TSTRANSCO Yes
54 ERRAGADDA TSTRANSCO Yes
55 OSMANIA UNIVERSITY TSTRANSCO Yes
56 IMLIBUN TSTRANSCO Yes
57 GUNROCK TSTRANSCO Yes
58 GACHIBOWLI TSTRANSCO Yes
59 SHANKARPALLY TSTRANSCO Yes
60 MEDCHAL TSTRANSCO Yes
61 MIYAPUR TSTRANSCO Yes
62 NAGOLE TSTRANSCO Yes
63 HAYATH NAGAR TSTRANSCO Yes
64 MALKARAM TSTRANSCO Yes
65 SHAPUR NAGAR TSTRANSCO Yes
66 SHIVARAMPALLY TSTRANSCO Yes
67 GHANAPUR TSTRANSCO Yes
68 MOULAI-ALI TSTRANSCO Yes
69 CHANDRAYANGUTTA TSTRANSCO Yes
70 POCHARAM TSTRANSCO Yes
71 PARIGI TSTRANSCO Yes
72 TANDUR TSTRANSCO Yes
73 KOSIGI TSTRANSCO Yes
74 NARSAPUR TSTRANSCO Yes
75 GAJWEL TSTRANSCO Yes
76 SIDDIPET TSTRANSCO Yes
77 KONDAPAKA TSTRANSCO Yes
78 SADASIVAPET TSTRANSCO Yes
79 YEDDUMAILARAM TSTRANSCO Yes
80 MINPUR TSTRANSCO Yes
81 DICHAPALLY 220kV TSTRANSCO Yes
82 KAMAREDDY TSTRANSCO Yes
83 DICHAPALLY 400kV TSTRANSCO Yes
84 NIRMAL TSTRANSCO Yes
85 BHEEMGAL TSTRANSCO Yes
86 MAHBUBNAGAR TSTRANSCO Yes
87 VELTOOR TSTRANSCO Yes
Status of Confirmation of Orderliness of Protection SLD's of Telangana
Annexure-IV
Page 5 of 18
88 WANAPARTHY TSTRANSCO Yes
89 THIMMAJIPET TSTRANSCO Yes
90 JURALA TSTRANSCO Yes
91 SINGOTAM TSTRANSCO Yes
92 YELLUR TSTRANSCO Yes
93 NETTAMPAD STAGE-1 TSTRANSCO Yes
94 NETTAMPAD STAGE-2 TSTRANSCO Yes
95 KALWAKURTHY TSTRANSCO Yes
96 DINDI TSTRANSCO Yes
97 SHADNAGAR TSTRANSCO Yes
98 GUDIPALLYGATTU TSTRANSCO Yes
99 REGUMANAGADDA TSTRANSCO Yes
100 GOWRIDEVIPALLY TSTRANSCO Yes
101 JONNALABOGUDA TSTRANSCO Yes
102 PULUKURTHY TSTRANSCO Yes
103 MEDARAM LIS
104 RAMADUGU LIS
105 SUNDILLA LIS
106 ANNARAM(LIS)
107 MEDIGADDA(LIS)
108 GUDEMDODDI(LIS) (NETTAMPAD STAGE-1)
109 MARLAVIDU(LIS) (NETTAMPAD STAGE-2)
110 MADUGULA
111 ASWARAOPET
112 KALLURU
113 KETHIREDDYPALLI
114 PEDDAGOPATHI_SS
115 KHAMMAM PGCIL SR-1 yes
116 NAGARJUN SAGAR-PGCIL PGCIL SR-1 yes
117 MAHESHWARAM-PGCIL PGCIL SR-1 yes
118 GHANAPUR-PGCIL PGCIL SR-1 yes
119 NIZAMABAD PGCIL PGCIL SR-1 yes
120 OGLAPUR PGCIL PGCIL SR-1 yes
121 NTPC SOLAR NTPC yes
122 NTPC SUPER THERMAL PS-RAMAGUNDAM_GS NTPC yes
123 ACME SIRCILLA_SOLAR yes yes
124 MYTRAH SHANIGARAM others yes
125 KARVY SOLAR-ANDAGULAPET others yes
126 SINGARENI THERMAL PP_GS others yes
127 ACME SUN WORLD -JAGTIAL_SOLAR others yes
128 RENEW POWER-ANDAGULAPET_SOLAR others yes
129 NEO-SOLREN_SOLAR others yes
130 JILESH_SOLAR others yes
131 VISHVARUPA SOLAR POWER
132 RENEW SOLAR-MULLAKANNUR others yes
133 ACME SOLAR-RAJPET others yes
134 PARAMPUJYA_SOLAR others yes
135 MYTRAH-KM PALLY_SOLAR others yes
136 ZUKA_SOLAR others yes
137 SURAJKIRAN_SOLAR-KMPALLY others yes
138 NBEIL_GS others yes
139 SURYODAY_SOLAR others yes
140 SUNSHAKTHI_SOLAR others yes
141 ACME SOLAR - NIZAMBAD others yes
142 DIVINE SOLREN_SOLAR others yes
143 HEAVY WATER PLANT-MANUGURU others yes
144 UJVAL TEJA SOLAR others yes
145 MYTRAH VAYU WIND others yes
146 CLEAN-PARIGI_SOLAR others yes
147 MYTHRAH-PARIGI_SOLAR others yes
148 WINSOL SOLAR others yes
149 DAYAKARA SOLAR POWER others yes
150 KAROOR SOLAR others yes
151 POLEPALLY SOLAR others yes
152 GLOBAL SOLAR others yes
153 RENEW POWER SHAKTHI -MINPUR others yes
154 ENERGON SOLAR -SADASHIVPET others yes
155 DINKAR SOLAR-MINPUR others yes
156 SURAJKIRAN SOLAR-SIDDIPET others yes
157 KARVY SOLAR-SADASIVAPET others yes
158 ENERGON SOLAR -MINPUR others yes
159 ACME SOLAR-SADASIVAPET others yes
160 RENEW SOLAR-SADASHIVPET others yes
161 BEL others yes
162 RENEW SOLAR-KAMAREDDY others yes
163 PRATHAMESH-SOLAR others yes
164 SE SOLAR others yes
165 SUN BORNE-SOLAR others yes
166 GRAHATI SOLAR others yes
167 RENEW AKSHYA URJA-SOLAR_GUDIBANDA others yes
168 TRANSFORM SUN ENERGY-SOLAR others yes
169 SUPRASANNA-SOLAR others yes
170 ACME MEDAK SOLAR others yes
171 AZURA POWER SOLAR others yes
Indicates SLD is submitted by utility . PRDC yet to
provide SLD
Annexure-IV
Page 6 of 18
SL. NO. SS NAME OWNERSLD prepared by
PRDC
Utilities responded
to SLDsfinalized or not
1 AMBALAMUGAL 220kV KSEBL Yes
2 AREAKKODE (KOZHIKODE) 220kV KSEBL Yes yes
3 BARAPOLA_GS KSEBL Yes yes
4 BRAHMAPURAM 220kV KSEBL Yes yes
5 BRAHMAPURAM_GS KSEBL No
6 EDAMON 220kV KSEBL Yes yes
7 EDAPPON 220kV KSEBL Yes yes
8 IDAMALAYAR_GS KSEBL Yes yes
9 IDUKKI 220kV KSEBL Yes yes
10 KAKKAD_GS KSEBL Yes yes
11 KALAMASSERY 220kV KSEBL Yes yes
12 KALLADA_GS KSEBL Yes yes
13 KANHIRODE 220kV KSEBL Yes yes
14 KANIAMPETTA 220kV KSEBL Yes yes
15 KUNDARA 220kV KSEBL Yes yes
16 KUTTIADY_GS+KES+KAES KSEBL Yes yes
17 LOWER PERIYAR 220kV KSEBL Yes yes
18 MADAKKATHARA 400kV KSEBL Yes yes
19 MALANKARA-GS KSEBL Yes yes
20 MALAPPARAMBA 220kV KSEBL Yes yes
21 MYLATTY 220kV KSEBL Yes yes
22 NALLALAM 220kV KSEBL Yes yes
23 KOZHIKODE DISEAL POWER PLANT_GS KSEBL Yes yes
24 NERIAMANGALAM HEP_GS KSEBL Yes yes
25 NEW PALLOM 220kV KSEBL Yes yes
26 ORAKATTERY(VADAKARA) 220kV KSEBL Yes yes
27 PALAKKAD 220kV KSEBL Yes yes
28 PALLIVASAL_GS KSEBL Yes yes
29 PALLOM 220kV KSEBL Yes yes
30 PANNIAR_GS KSEBL Yes yes
31 PORINGAL_GS & PLBE_GS KSEBL Yes yes
32 POTHENCODE 220kV KSEBL Yes yes
33 PUNNAPARA 220kV KSEBL Yes yes
34 SABARIGIRI(MOOZHIYAR)_GS KSEBL Yes yes
35 SENGULAM_GS KSEBL Yes yes
36 SHOLYAR_GS KSEBL Yes yes
37 SHORANUR 220kV KSEBL Yes yes
38 TALIPARAMBA 220kV KSEBL Yes yes
39 AMBALATHARA 220kV KSEBL Yes yes
40 Kattakada KSEBL No
41AREAKKODE (KOZHIKODE)(400/ 220kV)
PG PGCIL (SR-II) Yes yes
42 KOCHI-EAST(PALLIKARA) 400kV PGCIL (SR-II) Yes
43 PALAKKAD(ELAPULLY) 400kV PGCIL (SR-II) Yes
44 POTHENCODE 400kV PGCIL (SR-II) Yes
45 THRISSUR 400kV PGCIL (SR-II) Yes
46 KAYAMKULAM_GS NTPC Yes yes
47 AGALI(SUZLON)_GS SUZLON Yes yes
48 AMBALATHARA_GS
Indian Renewable
Energy Development
Agency
No
49 CIAL_GSCochion International
Airport LtdYes yes
50 INOX WIND FARM_GS INOX No
51 KARIKKAYAM_GSAyyappa Hydro Power
LtdYes yes
52 KUTHANGL HEP_GSIndsil Hydro Power &
Manganese LtdYes yes
53 MANIYAR_GSManiyar Hydro
Electric PowerYes yes
54 PCBL_GSPhillips Carbon Black
ltdYes yes
55PUSHPAKANDAM
(RAMAKKELMEDU)_GSVESTAS Yes yes
Indicates SLD is submitted by utility .
PRDC yet to provide SLD
Status of Confirmation of Orderliness of Protection SLD's for Kerala
Annexure-IV
Page 7 of 18
SL. NO. SS NAME OWNERSLD prepared
by PRDC
Utilities
responded to
SLDs
finalized or not
1 Alliyar PH_GS TANGEDCO yes
2 Kadamparai PH_GS TANGEDCO yes
3 Kundah 1_GS TANGEDCO yes
4 Kundah 2_GS TANGEDCO yes
5 Kundah 3_GS TANGEDCO yes
6 Kundah 4_GS TANGEDCO yes
7 Kundah 5_GS TANGEDCO yes
8 Kundah 6_GS TANGEDCO yes
9 Moiyar_GS TANGEDCO yes
10 Pushep_GS TANGEDCO yes
11 Sarkarpathy_GS TANGEDCO yes
12 Sholiyar PH1 _GS TANGEDCO yes
13 Sholiyar PH2_GS TANGEDCO yes
14 Periyar PH_GS TANGEDCO yes
15 Suriyalur PH_GS TANGEDCO yes
16 Bhavani kattalai barrage 2_GS TANGEDCO yes
17 Bhavani kattalai barrage 3_GS TANGEDCO yes
18 Lower Bhavani hydro&RBC_GS TANGEDCO yes
19 Bhavani kattalai barrage 1_GS TANGEDCO yes
20 LMHP -4_GS TANGEDCO yes
21 LMHP -1_GS TANGEDCO yes
22 LMHP -2_GS TANGEDCO yes
23 Mettur Dam PH_GS TANGEDCO yes
24 MTPH_GS TANGEDCO yes
25 MTPS 1_GS TANGEDCO yes
26 MTPS 2_GS TANGEDCO yes
27 Lower Mettur barrage 3_GS TANGEDCO yes
28 NCTPS -1_GS TANGEDCO yes
29 NCTPS -2_GS TANGEDCO yes
30 ETPS TANGEDCO yes
31 Tuticorin Thermal Power Station_GS TANGEDCO yes
32 Servalar PH_GS TANGEDCO yes
33 Papanasam PH_GS TANGEDCO yes
34 Kodayar 1_GS TANGEDCO yes
35 Kodayar 2_GS TANGEDCO yes
36 Bhavani Barraige -1_GS TANGEDCO yes
37 Bhavani Barraige -2_GS TANGEDCO yes
38 Pykara_GS TANGEDCO yes
39 BBGTPS TANGEDCO yes
40 KGTPS(KUTTALAM) TANGEDCO yes
41 THIRUMAKOTTAI(KOVILKALPAL) TANGEDCO yes
42 VGTPS TANGEDCO yes
43 Aliyar TANTRANSCO yes
44 Anaikadavu TANTRANSCO yes
45 Arasur 220kV TANTRANSCO yes
46 Coimbatore TANTRANSCO yes
47 basin Bridge TANTRANSCO yes
48 Karavalur TANTRANSCO yes
49 Othakalamandapam TANTRANSCO yes
50 Palladam TANTRANSCO yes
51 Ponnapuram TANTRANSCO
52 Rasipalyam TANTRANSCO yes
53 Sadayapalyam TANTRANSCO
54 Mettur TANTRANSCO
55 Thudiyalur TANTRANSCO yes
56 Myvadi TANTRANSCO yes
57 Udumelpet TANTRANSCO yes
58 Pasumalai TANTRANSCO yes
59 Alagarkovil TANTRANSCO yes
60 Chekkanurani TANTRANSCO yes
61 Kinnimangalam TANTRANSCO yes
62 Theni TANTRANSCO yes
Status of Confirmation of Orderliness of Protection SLD's for TamilNadu
Annexure-IV
Page 8 of 18
63 Karaikudi_230kV TANTRANSCO yes
64 Kavanoor TANTRANSCO yes
65 Vazhathoor TANTRANSCO yes
66 Kamuthi TANTRANSCO yes
67 Sembatti TANTRANSCO yes
68 Ranganathpuram TANTRANSCO yes
69 Thiruvalam_400kV TANTRANSCO yes
70 Echur TANTRANSCO yes
71 Arani TANTRANSCO yes
72 Thiruvalam_230kV TANTRANSCO yes
73 Vinnimangalam TANTRANSCO yes
74 Mosur TANTRANSCO yes
75 Alamathi TANTRANSCO yes
76 Gummidipondi TANTRANSCO yes
77 Thervaikandikai TANTRANSCO yes
78 Perambalur TANTRANSCO yes
79 Trichy TANTRANSCO yes
80 Samayapuram TANTRANSCO yes
81 Pudukkottai TANTRANSCO yes
82 Thanjavur TANTRANSCO yes
83 Kumbakonam TANTRANSCO yes
84 Kadalangudi TANTRANSCO yes
85 Thiruvarur TANTRANSCO yes
86 Karambayam TANTRANSCO yes
87 Alundur TANTRANSCO yes
88 Poyyur TANTRANSCO yes
89 Mondipatty TANTRANSCO yes
90 Jammunathapuram TANTRANSCO yes
91 Sriperumbudur TANTRANSCO yes
92 Hyundai TANTRANSCO yes
93 Oragadam TANTRANSCO
94 Mambakkam sipcot TANTRANSCO yes
95 Nokia TANTRANSCO yes
96 Singaperumal Kovil TANTRANSCO yes
97 Omega TANTRANSCO yes
98 Veerapuram TANTRANSCO yes
99 Thingalur TANTRANSCO yes
100 Anthiyur TANTRANSCO yes
101 Gobi TANTRANSCO yes
102 Ingur TANTRANSCO yes
103 Palakapalayam TANTRANSCO yes
104 Pugalur TANTRANSCO yes
105 Kurukathi TANTRANSCO yes
106 Unjanai TANTRANSCO yes
107 K R Thoppur TANTRANSCO yes
108 Valayapatti TANTRANSCO yes
109 Pudhansandhai TANTRANSCO yes
110 Nethimedu TANTRANSCO yes
111 Singapuram TANTRANSCO yes
112 Deviakurichi TANTRANSCO yes
113 Kariyamangalam TANTRANSCO yes
114 Palavadi_400kV TANTRANSCO yes
115 Singarapet TANTRANSCO yes
116 Gurubarapalli TANTRANSCO yes
117 Hosur TANTRANSCO yes
118 Annupakulam TANTRANSCO yes
119 N N Patty TANTRANSCO yes
120 Amuthapuram TANTRANSCO yes
121 Kayathar TANTRANSCO yes
122 Muthumalingapuram TANTRANSCO yes
123 Eachangadu TANTRANSCO yes
124 Villupuram TANTRANSCO yes
125 Cuddalore TANTRANSCO yes
126 T V Malai TANTRANSCO yes
127 Acharapakkam TANTRANSCO yes
128 Sathanur Dam_GS TANTRANSCO yes
Annexure-IV
Page 9 of 18
129 Ulundurpet TANTRANSCO yes
130 Korattur TANTRANSCO yes
131 Ambattur TANTRANSCO yes
132 Thiruverkadu TANTRANSCO yes
133 Koyembedu CMRL TANTRANSCO yes
134 Koyembedu TANTRANSCO yes
135 Athipattu TANTRANSCO yes
136 Kodikurchy TANTRANSCO yes
137 Veeranam TANTRANSCO yes
138 Kanarpatti TANTRANSCO yes
139 Sankaneri TANTRANSCO yes
140 S.R. Pudur TANTRANSCO yes
141 Udayathur TANTRANSCO yes
142 Meelavitan TANTRANSCO yes
143Sterlite
TANTRANSCO
144 Tuticorin Auto TANTRANSCO yes
145 Taramani TANTRANSCO yes
146 Siruseri TANTRANSCO yes
147 Kits Park TANTRANSCO yes
148 RA Puram TANTRANSCO yes
149 Guindy TANTRANSCO yes
150 Kadapperi TANTRANSCO yes
151 Alandur TANTRANSCO yes
152 Mylapore TANTRANSCO yes
153 Basin Bridge TANTRANSCO
154 Vyasarpadi TANTRANSCO yes
155 Ottiyambakkam TANTRANSCO yes
156 Tondairpet TANTRANSCO yes
157 Kilpauk TANTRANSCO yes
158 Manali TANTRANSCO yes
159 S V CHATRAM TANTRANSCO yes
160 KUMBAKKONAM TANTRANSCO
161 VALAYAPATTY TANTRANSCO
162 MUTHURAMALINGAPURAM TANTRANSCO
163 SAVASAPURAM TANTRANSCO yes
164 PORUR TANTRANSCO No
165 KANCHEEPURAM TANTRANSCO No
166 THAPPAGUNDU TANTRANSCO No
167 Kayathar TANTRANSCO yes
168 Arasur 400kV PGCIL (SR-II) yes
169 Udumelpet-400kV PGCIL (SR-II) yes
170 Nagapattinam PGCIL (SR-II) yes
171 Karaikudi_400kV PGCIL (SR-II) yes
172 Thiruvalam_765kV PGCIL (SR-II) yes
173 Sriperumbudur PGCIL (SR-II) yes
174Pugalur
PGCIL (SR-II) yes
175 K R Thoppur -PG(SALEM) PGCIL (SR-II) yes
176 Palavadi_765kV PGCIL (SR-II) yes
177 Hosur_PG PGCIL (SR-II) yes
178 Madurai PGCIL (SR-II) yes
179 Tuticorin PGCIL (SR-II) yes
180 Thirunelveli PGCIL (SR-II) yes
181 TUTICORIN GIS PGCIL (SR-II) yes
182 Trichy PGCIL (SR-II) yes
183 KALIVANTANAPATTU PGCIL (SR-II) yes
184 Neyveli TPS 1 exp_GSNeyveli Lignite Corporation
India Ltdyes
185 Neyveli TPS 2 exp_GSNeyveli Lignite Corporation
India Ltdyes
186 Neyveli TPS I_GSNeyveli Lignite Corporation
India Ltdyes
187 Neyveli TPS II_GSNeyveli Lignite Corporation
India Ltdyes
Annexure-IV
Page 10 of 18
188 Neyvelli mines 1 Neyveli Lignite Corporation
India Ltdyes
189 Neyvelli mines 2 Neyveli Lignite Corporation
India Ltdyes
190 MAPS_GS NPCIL
191 Kudankulam Nuclear PP_GS NPCIL
192 IL & FS_GS IL &FS
193 NTPL -Tuticorin_GS NLC Tamilnadu Power Ltd yes
194 CEPL - Tuticorin_GS Coastal Energen Pvt Ltd yes
195 Vallur_GS NTECL
196 Re-Gen Power Tech_GS(Anaikadavu) REGEN
197 ARS ARS Energy Pvt Ltd yes
198 OPG OPG Power Generation Ltd yes
199 Kamatchi_GSKamatchi Sponge & Power
Corporation Ltdyes
200 Suryadev_GSSuryadev Alloys Power Pvt
Ltdyes
201 Cauvery_GSCauvery Power Generation
Corporation Ltdyes
202 PPN Power GEN company_GS PPNPGPL
203 TAQA(STCMS) STCMS
204 IND Bharath IPP_GS IBGCL
205 Vedanta ltd,TPP(Sterlite)_GS VL
206 IND Bharath TPP_GS IBTPL
207 MALCO_GS Malco Eenergy Ltd
208 WATSON(PERIYAPATTI) TATAPOWER
209 GAMESA WPP(SANGARAPERI) GWPP
210 AGETL ADANI
211 KSPL ADANI
212 WELSPUN(Tata Power) TATAPOWER
213 TNPL PUGALURTamilnadu Newsprint &
Papers Ltd
214 VELLAPANERI SUZLON
215 ARKAY ARKAY
216 CCCL ARIYALURChettinad Cement
Corporation Ltd
217 CCCL KARIKKALIChettinad Cement
Corporation Ltd
218 CCCL PULIYURChettinad Cement
Corporation Ltd
219 CHEMPLAST(RC PLANT) Chemplast Sanmar Ltd
220 CORAMENDALCoromendal Electric
Company Ltd
221 DALMIA ARIYALUR Dalmia Cement Bharat Ltd
222 DALMIA DALMIYAPURAM Dalmia Cement Bharat Ltd
223 JSW JSW Power Ltd
224 LTPCLLanco Tanjore Power
Corporation Ltd
225 MMS STEELS MMS STEEL
226 PIONEER PIONEER
227 REGEN POWER TECH(PARUTHIYUR) REGEN
228 SAI REGENCYSAI REGENCY POWER
CORPORATION Ltd
229 SAIL Steel Authority India Ltd
230 SREE RENGARAJAN SPOT Shree Rangaraj ispat Pvt Ltd
231 TNPL MOONDIPATTITamilnadu Newsprint &
Papers Ltd
232 ASPEN ASPEN
233 HITECH CARBON Adithya Birla
234 Thulasiyan Thulsyan Nec Ltd yes
Annexure-IV
Page 11 of 18
235 TCPL TCPL yes
236 PPCL PPCL
237 MCL (Ramco Cements) Ramco Group
238 ICL India Cement Ltd
239 DCW DCW
240 SAKTHI SUGARS APPAKOODAL SAKTHI SUGARS
241 SAKTHI SUGARS POONDURAI SEMUR SAKTHI SUGARS
242 SHESHASAYEE PAPER BOARDS SHESHASAYEE PAPER
BOARDS
243 GRIRAJ GRIRAJ
244 S.P.SOLAR S.P.SOLAR
245 NLC NLC
246 ADHAVAN ADANI
247 KATHIRAVAN ADANI
248 NLC (PES) NLC
249 NLC (JACKSON) NLC
250 RREL RREL
251 KREL KREL
252 RSPL RSPL
253 NLC (REFAX) NLC
254 PENNA PENNA
255 RK RK
256 GRT GRT
257 RRE RRE
258 BETA WIND FORM BETA WIND FORM
259 Madras Sugars M/s Madras Sugars
260 Bannari Amman Sugars, Unit 4 M/s Bannari Amman Sugars,
Unit 4
261 E I D Parry Sugars M/s E I D Parry Sugars
262 SEI PHOEBUS GREENKO GROUP PVT.LTD
valuthur? As S.No. 65
As sanganeri?
Indicates SLD is submitted by utility .
PRDC yet to provide SLD
Annexure-IV
Page 12 of 18
SL. NO. SS NAME OWNER
SLD
prepared
by PRDC
Utilities
responde
d to SLDs
finalized or not
1 Villianur PED yes yes
2 Thondamanatham PED yes yes
3 Bahoor PED yes yes
4 Pondy PGCIL (SR-II) yes yes
Status of Confirmation of Orderliness of Protection SLD's for TamilNadu
Annexure-IV
Page 13 of 18
SL.NO. SS NAMEVOLTAGE
LEVEL(kV)OWNER Status
Details of elements not
modeled due to non-
availability of data
Details of elements not
modeled due to non-
availability of tool in MiP-
PSCT
Utilities
responded to
SLDs
finalized or not
1
SHIVANSAMUDRA_GS 66/11/11/1.45 KPCL Attached -
60N (Neutral Current
Unbalance) relay is not
modelled.
87N (Restricted Earth Fault)
relay (for generator) is not
modeled.
2SHIMSHA GS POWER_GS 66/2.2/0.433 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
3ALMATTI_GS 220/11/0.415 KPCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeled
4GHATAPRABHA _GS 110/11/0.415 KPCL Attached
Bus bar differential
(87B) not modeled as
46 (negative seq. realy) not
modelled for capacitor bank
5MUNIRABAD_GS 220/110/66/33/11 KPCL Attached - -
6YTPS_GS 27/400/33/11.5 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
7BTPS_GS 400/220/21/11.5 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
8RTPS_GS
15.75/16.5/400/22
0/15/33/6.9KPCL
Attached (2
drawings)-
50 BF (Breaker failure) relay is
not modeled
9KADRA _GS
220/11/0.415/0.43
3KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
10KODASALLI _GS 220/11/0.415 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
11SUPA _GS 110/11/0.415 KPCL Attached
Bus bar differential
(87B) not modeled as
59N(Neutral Voltage
Displacement) relay is not
12NAGAJHARI_GS 220/11/11/0.415 KPCL Attached - -
13MALLAPURA_MINI_GS 110/6.6/0.415 KPCL Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
14SHARAVATHY_GS 220/11/0.415 KPCL Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
15GERUSOPPA_GS 220/11/0.433 KPCL Attached -
50 BF (Breaker failure) relay is
not modeledyes
16LINGANAMAKKI_GS 110/11/0.415 KPCL Attached
Generator relay details
not
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
17MGHEW_GS 110/11/0.415 KPCL Attached
Bus bar differential
(87B) not modeled as -
18BHADRA LB&RB_GS 66/11/0.415 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
19VARAHI UGPH_GS 220/11/0.415 KPCL Attached -
50 BF (Breaker failure) relay is
not modeled
20MANI DAM PH_GS 110/11/0.415 KPCL Attached - -
21
CHAMARAJANAGARA_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled.
60N (Neutral Current
Unbalance) relay is not
22HOOTAGALLY_SS 220/66/11/0.433 KPTCL Attached - -
23KADAKOLA_SS 220/66/11/0.433 KPTCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeled
24VAJMANGALA_SS 220/66/11/0.433 KPTCL Attached - -
25KUSHALNAGAR_SS 220/66/11/33 KPTCL Attached
Bus bar differential
(87B) not modeled as 60N Relay are not modelled
26TUBINAKERE_SS 220/66/11/0.433 KPTCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeled
27MADHUVANAHALLI_SS 220/66/11/0.433 KPTCL Attached -
59N HAS NOT BEEN MODELLED
50BF HAS NOT BEEN
28HUYGONAHALLI(K R PET)_SS 220/66/11/0.433 KPTCL Attached - -
29TK HALLI_SS 220/66/11/0.433 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
30MK _HUBBALI_SS 220/110/11/0.433 KPTCL Attached - -
31DONI_SS 400/220/33 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled.
32HAVERI_SS 220/110/11 KPTCL Attached - -
33SRS HUBBLI_SS
220/110/33/11/0.4
33KPTCL Attached - -
34BIDNAL_SS 220/110/11/0.433 KPTCL Attached - -
35RANEBENNUR_SS
220/110/33/11/0.4
33KPTCL Attached -
46 (negative seq. realy) not
modelled for capacitor bank
36GADAG_SS 220/110/11 KPTCL Attached
Bus bar differential
(87B) not modeled as -
37SARJAPURA_SS 220/66/11/0.433 KPTCL Attached - -
38VIKAS TECH PARK_SS 220/66/11/0.433 KPTCL Attached - -
39SUBRAMANYAPURA_SS 220/66/11 KPTCL Attached
Bus bar differential
(87B) not modelled as
50 BF (Breaker failure) relay is
not modeled
40MAHALINGAPUR_SS
220/110/33/11/0.4
33KPTCL Attached - -
41BAGALKOT_SS
220/110/33/11/0.4
33KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
42VAJRAMATTI_SS 220/110/11/0.433 KPTCL Attached - -
43BASAVANA BAGEWADI _SS
220/110/33/11/0.4
33KPTCL Attached -
79 (Auto Reclosure) relay is not
modeled
44INDI_SS
220/110/33/11/0.4
33KPTCL Attached - -
45BIJAPUR_SS
220/110/33/11/0.4
33KPTCL Attached - -
Status of Finalising PSLD's
Annexure-IV
Page 14 of 18
46ATHANI_SS
220/110/33/11/0.4
33KPTCL Attached - -
47SAVADATTI_SS
220/110/33/11/0.4
33KPTCL Attached - -
48GHATAPRABHA _SS
220/110/33/11/0.4
33KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
49CHIKODI_SS
220/110/33/11/0.4
33KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
50KUDACHI_SS
220/110/33/11/0.4
33KPTCL Attached - -
51BELAGAVI_SS 220/110/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled.
52ITTAGI_SS 220/66/11 KPTCL Attached - -
53KUSHTAGI_SS
220/110/33/11/0.4
33KPTCL Attached - -
54RAICHUR_SS 220/110/33/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modelled
55MALLAT_SS 220/110/11 KPTCL Attached - -
56LINGSUGUR_SS 220/110/33/11 KPTCL Attached
Bus bar differential
(87B) not modelled as
50 BF (Breaker failure) relay is
not modelled
57ALLIPURA_SS 220/110/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled.
58SINDHANUR_SS 220/110/11/0.433 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
59SEDAM_SS 220/110/33/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
60SHAHABAD_SS 220/110/11 KPTCL Attached - -
61KAPANOOR_SS 220/110/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
62HUMNABAD_SS 220/110/11/0.433 KPTCL Attached - -
63HALABARGA_SS 220/110/11/0.433 KPTCL Attached - -
64MALUR_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled.
65GOWRIBIDANUR_SS 220/66/11/0.415 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
66MADHUGIRI_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
67NITTUR_SS 220/110/33/11 KPTCL Attached - 50 BF relay is not modelled
68KB CROSS_SS 220/110/33/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
69ANTHARASANAHALLI_SS 220/66/11/0.433 KPTCL Attached - -
70PAVAGADA_SS 220/66/11 KPTCL Attached - -
71JAGALUR_SS 400/220/33 KPTCL Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
72THALAK_SS 220/66/11 KPTCL Attached - -
73CHITRADURGA_SS 220/66/11/0.433 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
74HIRIYUR _SS 220/66/11/0.433 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeleD
75GUTTUR_SS 400/220/33 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
76
NEELAGUNDA_SS 220/66/11 KPTCL Attached - -
77HONNALI_SS 220/66/11 KPTCL Attached -
59N HAS NOT BEEN MODELLED
50BF HAS NOT BEEN
78DAVANAGERE_SS 220/66/11/11 KPTCL Attached -
60N (Neutral Current
Unbalance) relay is not
79KARWAR_SS 220/110/11 KPTCL Attached - -
80SIRSI_SS 220/110/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
81AMBEWADI_SS 220/110/33/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
82NELAMANGALA 400_SS 400/220/33 KPTCL Attached - -
83DOBOSPET 220KV_SS 220/66/11 KPTCL Attached - -
84BIAL,BEGUR 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modelled
85A STATION 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
86DB PURA NRS 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
87KIADB DB PURA 220KV_SS 220/66/11/0.433 KPTCL Attached
87N for ICT-1 AND 2,
TRF-1 AND 2 are not -
88HEBBAL 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
89MAGADI 220KV_SS 220/66/11/0.433 KPTCL Attached - -
90NRS RAJAJINAGAR 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
91VRUSHABHAVATHY 220KV_SS 220/66/11/0.415 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
92YELAHANKA 220KV_SS 220/66/11/0.433 KPTCL Attached - -
93SRS PEENYA 220KV_SS 220/66/11/0.415 KPTCL Attached -
59N (Neutral Displacement)
relay is not modelled
Annexure-IV
Page 15 of 18
94
DEVANAHALLI HARDWARE TECH
PARK 220KV_SS220/66/11 KPTCL Attached - -
95HOODY 400_SS 400/220/33 KPTCL Attached -
59N (Neutral Displacement)
relay is not modelled
96BIDADI 220KV_SS 220/66/11/0.433 KPTCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeled
97EAST DIVISION COMPOUND 220KV_SS 220/66/11/0.433 KPTCL Attached - -
98HAL 220KV_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
99HSR LAY OUT 220KV_SS 220/66/11/0.433 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
100HOODY 220KV_SS 220/66/11 KPTCL Attached
Relays not modeled for
220kv bus coupler due -
101JIGANI 220KV_SS 220/66/11/0.433 KPTCL Attached - -
102KANAKAPURA 220KV_SS 220/66/11 KPTCL Attached - -
103NAGANATHPURA 220KV_SS 220/66/11/0.433 KPTCL Attached - -
104EPIP 220KV_SS 220/66/11 KPTCL Attached - -
105TALAGUPPA_SS 400/220/33 KPTCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeled
106BALLIGAVI_SS 220/110/11 KPTCL Attached - -
107MRS SHIVAMOGGA_SS
220/110/66/11/0.4
15KPTCL Attached -
87B partially done, 50BF not
modelled
108KADUR_SS 220/110/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
109CHIKKAMGALUR_SS 220/66/11/0.415 KPTCL Attached - -
110YACHENAHALLY_SS 220/66/11/0.415 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
111ARASIKERE_SS 220/110/11/0.415 KPTCL Attached - -
112HASSAN_SS 220/66/11 KPTCL Attached
Bus bar differential
(87B) not modeled as
50 BF (Breaker failure) relay is
not modeleD
113KADAVINAKOTE_SS 220/66/11/0.415 KPTCL Attached - -
114KAVOOR_SS
220/110/33/11/0.4
15KPTCL Attached - -
115NETLAMUDNUR_SS
220/110/33/11/0.4
15KPTCL Attached - -
116KEMAR_SS 220/110/11/0.415 KPTCL Attached
Relays are replaced in
s/s. waiting for relay -
117MSEZ BAJPE_SS 220/110/11/0.415 KPTCL Attached - -
118KOLAR_SS 220/66/11/0.415 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
119CHINTAMANI_SS 220/66/11 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
120HOSKOTE_SS 220/66/11/0.415 KPTCL Attached - -
121KHODAYS GLASS FACTORY_SS 220/66/11/0.415 KPTCL Attached - -
122YARANDANAHALLY_SS 220/66/11/0.415 KPTCL Attached - -
123NIMHANS_SS 220/66/11/0.415 KPTCL Attached - -
124SOMMANAHALLI_SS 220/66/11/0.415 KPTCL Attached -
50 BF (Breaker failure) relay is
not modelled
125SHAHAPUR_SS
220/110/33/11/0.4
15KPTCL Attached - -
126NARENDRA 220/110/11/0.433 KPTCL Attached - -
127ANCHEPALYA SS 220/66 KPTCL Attached - -
128HARTHI_SS 220 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
129LINGAPURA_SS 220 KPTCL Attached - -
130BELLARY POOLING STATION_SS 400 KPTCL Attached -
50 BF (Breaker failure) relay is
not modeled
131RAICHUR_PG 765/400/33/0.415 PGCIL (SR-I) Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeledyes
132MUNIRABAD _PG 400/220/33 PGCIL (SR-I) Attached - - yes
133BASTIPURA_SS 400/220/33 PGCIL (SR-II) Attached -
21PB (Phase Backup) relay
(for shunt reactor) is not
134NARENDRA_PG 400/220/33 PGCIL (SR-II) Attached - -
135BIDADI_PG 400/220/33 PGCIL (SR-II) Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
136SOMMANAHALLI_PG 400/220/33 PGCIL (SR-II) Attached -
79 (Auto Reclosure) relay is not
modeled
137VASANTHNARASAPUR _PG 400/220/33 PGCIL (SR-II) Attached - -
138HIRIYUR 400KV_PG 400/220/33/0.433 PGCIL (SR-II) Attached -
50 BF (Breaker failure) relay is
not modeled
139PAVAGADA_PG 400/220/33 PGCIL (SR-II) Attached -
50 BF (Breaker failure) relay is
not modeled
140YELAHANKA_PG 400/220/33 PGCIL (SR-II) Attached
Bus bar differential
(87B) not modeled as -
141SHANTIGRAMA_PG 400/220/33/0.415 PGCIL (SR-II) Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
142KOLAR HVDC_SS
400/200/33/66/0.4
15PGCIL (SR-II) Attached - -
143KUDGI_PG 400 PGCIL (SR-II) Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
Annexure-IV
Page 16 of 18
144KUDGI THERMAL POWER STATION_GS
400/220/23.5/11.5
/3.45/33NTPC Attached - -
145KAIGA_GS
400/220/16.5/33/6
.9NPCIL Attached -
21PB (Phase Backup) relay (for
shunt reactor) is not modeled
146UPCL_GS
400/220/33/22/6.9
/0.415/11UPCL Attached
Bus bar differential
(87B) not modeled as
21PB (Phase Backup) relay (for
shunt reactor) is not modeledyes
147JSW ENERGY LTD
400/220/33/11/10.
5/20/6.9JSWEL Attached - -
148WIND WORLD_HARTHI_GS 220/33/0.69/0.433
ECOREN
ENERGY IND
Attached as part
of SL no . 128- -
149AMPLUS SOLAR_HARTHI_GS 220/33/0.433
AMPLUS KN
SOLAR PVT LTDAttached - -
150HANUMAPUR LIS_SS 220/6.9/6.6/0.433 KBJNL Attached - -
151BALUTHI LIS_SS 220/6.9/6.6/0.415 KBJNL Attached -
59N(Neutral Voltage
Displacement) relay is not
152MASUTI LIS_SS 220/11/6.9 KBJNL Attached - -
153VYSHALI ENERGY PVT LTD_GS 220/33/0.433 GREENKO Attached - -
154GOPALPURA_SS 220/33/0.433
SUZLON
POWER Attached - -
155SAGITUR VENTURES INDIA PVT LTD 220/33/0.38
SAGITUR
VENTURES Attached - -
156AZURE POWER INDIA PVT LTD 220/11/0.38 AZURA POWER Attached - -
157WIND WORLD INDIA LTD 220/33/0.4
WIND WORLD
INDIA LTDAttached - -
158VISH WIND INFRASTRUCTURE INDIA PVT LTD 220/33/0.4
WIND WORLD
INDIA LTDAttached - -
159GREEN INFRA WIND ENERGY GENERATION LTD 220/33/0.69
SEMBCORP
GREENINFRA Attached - -
160KUDREKONDA_WIND 220/33/0.69
SUZLON
POWER Attached - -
161HANUMANTAPPA_WIND 220/33/0.69
SUZLON
POWER Attached - -
162WISH WIND _ TADAS 220/33/0.415
WIND WORLD
INDIA LTDAttached - -
163WIND WORLD INDIA LTD _ KANABARGI 220/33/0.4
WIND WORLD
INDIA LTDAttached -
50 BF (Breaker failure) relay is
not modeled
164OSTRO DAKSHIN POWER PVT LTD 220/33/0.69
OSTRO
DAKSHIN Attached - -
165SUZLON GLOBAL SERVICE LTD _ KUSHTAGI 220/33/0.69
SUZLON
POWER Attached - -
166VESTAS WIND TECHNOLOGY INDIA PVT LTD 220/33/0.69 VESTAS Attached - -
167EMBASSY ENERGY INDIA PVT LTD 220/33/0.4
EMBASSY
ENERGY INDIA Attached - -
168WARDHA SOLAR(MH) PVT LTD 220/33/0.5 ADANI Attached - -
169FOTUNE FIVE HPPL OF GREENKO LTD 220/33/0.69 GREENKO Attached - -
170RBRK 220/33/0.69 INOX Attached - -
171ATRIA PSS 220/33/0.69
ATRIA POWER
CORPORATION Attached - -
172GM NAVAR(MYTRAH VAYU KRISHNA WIND PLANT)220/33/0.69
GM NAVARA
WIND ENERGY Attached - -
173MULVAD 4TH 'A' LIS 220/6.6/0.415 KBJNL Attached - -
174
SIEMENS GAMESHA WIND POWER
PLANT220/33/0.69 GAMESA
SLD is not
available. Hence - -
175SUN PHOTO VOLTAIC ENERGY LTD 220/33/12
SUN PHOTO
VOLTAIC Attached
Bus bar differential
(87B) not modeled as -
176
ENERGON SOLEQ RAVI INDIA POWER RESOURCES PVT LTD 220/33/0.575 VENA ENERGY Attached - -
177CLEANMAX PHOTO VOLTAIC PVT LIMITED 220/33/0.68
CLEANMAX
PHOTO Attached - -
178ORIENT CEMENTS 220/11.5/11/0.415
ORIENT
CEMENTS LTDAttached - -
179YARNAL_SS 220
GM NAVARA
WIND ENERGY Attached - -
180KANABURGI_SS 220
WIND WORLD
INDIA LTDAttached - -
181
DKSSK CO GEN PLANT (Connnected
to Chikkodi)110 DKSSK
Visited recently.
Protection SLD - -
182KSSKN (Connected to Athini) 110 KSSKN
Visited recently.
Protection SLD - -
183
BGL WIND (Connected to Basawan
Bagewadi)33 BGL WIND
Visited recently.
Protection SLD - -
184
RBRK WIND(Connected to Basawan
Bagewadi)33 RBRK WIND
There is no
Connectivity - -
185ENERGON(Connected to Bijapur) 110 ENERGON
Visited recently.
Protection SLD - -
186HGMS (Connected to Chitradurga) 66 HGMS
Visited recently.
Protection SLD - -
187SUZLON(Connected to Chitradurga) 66 SUZLON
Visited recently.
Protection SLD - -
188AFTL (Connected to Gauribaidnur) 66 AFTL
Visited recently.
Protection SLD - -
189SUZLON(Connected to Hassan) 11 SUZLON
Visited recently.
Protection SLD - -
190RKP(Connected to Hiriyur) 66 RKP
Visited recently.
Protection SLD - -
191SUZLON(Connected to Hiriyur) 66 SUZLON
Visited recently.
Protection SLD - -
192ENERCON(Connected to Hiriyur) 66 ENERCON
Visited recently.
Protection SLD - -
194
LATUR WIND (Connected to
Lingsugur)110 LATUR
Visited recently.
Protection SLD - -
Annexure-IV
Page 17 of 18
195KDRPL (Connected to Lingsugur) 110 KDRPL
Visited recently.
Protection SLD - -
196CMHS (Connected to Lingsugur) 110 CMHS
Visited recently.
Protection SLD - -
197
WARADHA SOLAR (Connected to
Shapur)110 WARADHA
Visited recently.
Protection SLD - -
199
MYSORE MERCHENTILE LTD-CO GEN
(Connected to Savadathi)110
MYSORE
MERCHENTILE
Visited recently.
Protection SLD - -
200DIAMOND (Connected to Thallak) 66 DIAMOND
Visited recently.
Protection SLD - -
201VENUS (Connected to Thallak) 66 VENUS
Visited recently.
Protection SLD - -
202WELSPUN(Connected to Thallak) 66 WELSPUN
Visited recently.
Protection SLD - -
203SUZLON (Connected to Ittagi) 66 SUZLON
Visited recently.
Protection SLD - -
204RENEW POWER(Connected to Ittagi) 66 RENEW POWER
Visited recently.
Protection SLD - -
205CLEANMAXConnected to Ittagi) 66 CLEANMAX
Visited recently.
Protection SLD - -
206
SOE PVT LTD SOLAR (Connected to
Gathaprabha)110 SOE PVT LTD
Visited recently.
Protection SLD - -
207
ACME SOLAR ( Connected to
Halabarga)110 ACME SOLAR
Visited recently.
Protection SLD - -
208
GREENKO SOLAR (Connected to
Pavagada)220 GREENKO
Visited recently.
Protection SLD - -
209VENUS (Connected to Pavagada) 66 VENUS
No connectivity
from Pavagada - -
210DIAMOND (Connected to Pavagada) 66 DIAMOND
No connectivity
from Pavagada - -
211WELSPUN(Connected to Pavagada) 66 WELSPUN
No connectivity
from Pavagada - -
212
SARJAN RELAITIES LTD (Connected
to Guttur)220
SAJAN
RELAITIES LTD
Same as
HANUMANTAPP
A_WIND. Sl 161
- -
213
JK Cements (Connected to
Vajramathi)110 JK Cements
Less than 25MW.
Hence station is - -
214
SUZLON POWER INFRA PVT LTD _
GOPALAPURA220/33/0.69
SUZLON
POWER
Same
as GOPALPURA_S- -
Annexure-IV
Page 18 of 18
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 3
With reference to above, the Constituents had been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC as per the format given below:
Sl. No.
Station Application Battery Battery Charger Remarks
Station Name
Code Type
(PS/ SS)
Protection/
Communication
Details Status (Healthy/ Unhealthy)
Details Status (Healthy/ Unhealthy)
1 Station-A Protection (Bank-1)
Protection (Bank-2)
Communication (Bank-1)
Communication (Bank-2)
2 Station-B …
… … …
Note: 1. Code is the short name of the Station
2. PS – Power Station; SS - Substation
The sought status for the months of January & February, 2017 had not been received from the following SR-Constituents:
Jan, 2017 TSGENCO (Hydro), KPTCL, PED & NLCIL
Feb, 2017 PED & JSWEL
7. Auto-Reclosure Implementation on all 220 kV & above transmission lines of
Southern Region
Majority of the faults that occur on transmission lines are of transient nature; hence provision of
Auto-Reclosure certainly helps not only in preventing forced outage of the subject transmission
line, but also in averting cascade trippings of adjacent transmission lines, in some cases, due to
consequent over-loading.
The provision for Auto-Reclosure is also mandated by Regulation 43 (4) (c) of CEA Technical
Standards for Construction of Electrical Plants and Electric Lines, 2010, which has force of law.
Therefore, it is in the interest of grid security that all Constituents implement auto-reclosure
feature on all 220 kV & above transmission lines in their respective control areas. Any exceptions
to this needed to be properly justified.
The issue was discussed in previous PCSC meetings where logics to be used for implementing A/R
had been clarified as follows:
Normal single-shot, single-ph A/R scheme (with simultaneous opening at both ends of feeder
with a dead-time of 1 sec and reclaim-time of 25 sec)
Time-Differentiated single-shot, single-ph A/R scheme [suitable for stations having concerns
relating to closing on to un-cleared fault, esp. Generators (Coal/ Gas/ Nuclear/ Hydro)]:
Annexure-V
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 4
“In this, after a line has been opened from both ends (generator end & grid end) on A/R operation, the grid end will be auto-reclosed as usual after the elapse of its dead-time (say, 1 sec). However, the generator end relay will check for the line voltage after elapse of an elongated dead time, say 1.5 sec [here the additional time delay of 0.5 sec, which has been included as a safety time margin, shall be chosen more than Zone-2 time delay & less than PDR time delay]. If the line voltage so sensed is healthy & normal (which implies that the fault has already been cleared), then generator end will be auto-reclosed; else 3-ph trip will be given at generator end to open the other two phase poles.”
It was also clarified that A/R implementation on lines connecting two generating stations is optional.
The issue was also discussed in TCC-30 & SRPC-31 meetings held on 24-25 February, 2017, and all Constituents agreed to furnish the detailed Action Plan for implementing A/R in their 220 kV & above voltage level transmission lines by next PCSC-62 meeting scheduled to be held on 15.03.2017.
In this regard, the status of implementation of A/R (excluding Radial feeders & Cables) as
furnished by SR-Constituents is as follows:
Sl.
No. Name of the Constituent
220 kV
400 kV 765 kV
Total no. of lines
No. of lines where A/R is in service
Total no. of lines
No. of lines where A/R is in service
Total no. of lines
No. of lines where A/R is in service
1 APGENCO 44 Nil 10 10 --- ---
2 APTRANSCO (Details not provided) Implemented in all
existing 400 kV lines
(Details not provided)
--- ---
3 TSGENCO
(Hydro)
15 Nil 5 Nil --- ---
TSGENCO
(Thermal)
16 Nil 6 6 --- ---
4 TSTRANSCO (Details not provided) Implemented in all
existing 400 kV lines
(Details not provided)
5 KPCL 50 16 11 11 --- ---
6 KPTCL 280 7 40 27 --- ---
7 TANGEDCO &
TANTRANSCO
239 138 22 22 --- ---
8 KSEB 61 52 --- --- --- ---
9 PED 6 6 --- --- --- ---
10 PGCIL (SR-I) --- --- 68 68 7 7
Annexure-V
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 5
11 PGCIL (SR-II) 15 15 92 92 2 2
12 NTPC
NTPC-Simhadri --- --- 8 8 --- ---
NTPC-Kudgi --- --- 4 4 --- ---
NTPC-
Ramagundam
4 Nil 10 10 (only for
main
breakers)
--- ---
A/R on 220 kV lines has not been provided as they are of very short length (1 km).
NTPC-
Kayamkulam
6 6 --- --- --- ---
13 NPCIL
MAPS 4 Nil --- --- --- ---
KGS 2 Nil 4 4 --- ---
A/R on 220 kV lines has not been kept in service as the remote ends are connected to
hydro power stations.
KKNPP 2 Nil 4 3 --- ---
BHAVINI 4 Nil --- --- --- ---
14 NLCIL 16 2 11 7 --- ---
15 JSWEL 2 Nil 2 2 --- ---
16 UPCL 2 Nil 2 2 --- ---
17 NTECL-Vallur --- --- 6 6* --- ---
Even though A/R has been implemented in all the six 400 kV lines, due to fibre optic
cable related issues between Vallur and NCTPS-II, A/R is effectively in service for 4
lines.
18 TPCIL --- --- 2 2 --- ---
19 CEPL --- --- 2 2 --- ---
20 HNPCL --- --- 2 2 --- ---
21 IL&FS --- --- 2 2 --- ---
22 Lanco KPL 2 Nil 2 2 --- ---
As the distance between Kondapally and VTPS Stage IV is only one span (350 mtrs),
A/R has been kept blocked from both the ends.
23 NTPL --- --- 2 2 --- ---
24 MEPL --- --- 2 1 --- ---
As 400 kV MEPL – SEL line, is a short line, A/R has not been kept in service on this line.
25 SEL --- --- 2 2 --- ---
Annexure-V
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 6
Action plan furnished by SR-Constituents for implementing A/R on the transmission lines, where it
is presently not in service.
Sl. No.
Constituent Action plan for implementing A/R
1 APGENCO (Philosophical Issues)
Auto-Reclose scheme for all 220 kV feeders of RTPP, Lower Sileru, Upper Sileru, Donkarayi & Srisailam RBPH of APGENCO are available but not commissioned since inception.
Dr. NTTPS (VTPS) 220 KV -- Auto-Reclose scheme for 9 feeders out of 15 feeders are available, but not commissioned since inception. For remaining 6 feeders, Static relays have to be replaced with Numerical relays to facilitate Auto-Reclose.
Details not provided.
2 APTRANSCO A/R scheme is implemented in all 400 kV network, and will be implemented for the latest & upcoming future 220 kV & above lines in APTRANSCO.
The details of availability and functioning of A/R scheme on the existing 220 kV network had been obtained from the field, and were being discussed with their management. The action plan would be furnished in next PCSC -63 meeting.
3 TSGENCO Details not provided.
4 TSTRANSCO For all the upcoming 220 kV & above feeders, the concerned wings have been requested to ensure A/R function and its implementation in the field.
The details of availability and functioning of A/R scheme on the existing 220 kV network had been obtained from the field, and were being discussed with their management. The action plan would be furnished in next PCSC -63 meeting.
5 KPCL In Sharavathy Generating Station, Auto re-close feature will be enabled after heightening the Towers of ST- 3 and S - 2 Line.
In Raichur Thermal Power Station, for 220kV lines, auto reclose feature is kept ready but disabled as per KPTCL guidelines.
In Nagjhari, Carrier aided protection wiring is in progress. The Auto re-close function will be enabled after completion of the Carrier aided protection wiring in consultation with KPTCL, RT Division.
In Kadra, Auto re-close feature is kept ready. However, the same is enabled in consultation with KPTCL, RT Division.
In Kodasalli, Auto re-close feature is kept ready. However, the same is disabled, since Lines are running between Power Houses.
6 KPTCL W.r.t. existing 400 kV lines, A/R has been implemented on all
lines.
W.r.t. existing 220 kV lines, retrofitting of Main-2 distance scheme in place of back up OC and EF relays in protection of 220kV lines is being taken up under R&U project, and awarded to M/s GE T&D India Limited. Along with Main-2 retrofitting works, Auto Reclosure scheme implementation will also be
Annexure-V
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 7
carried out for existing 220 kV lines. Works at 26 No.s of audited sub stations are taken up on top priority and planned to complete before 31.05.2017.
Further, A/R will be implemented in all future 400 kV & 220 kV lines.
7 TANGEDCO & TANTRANSCO
Details of 230kV Feeders in which A/R not enabled: 1. A/R not enabled in the following feeders for the reasons stated:
Generation connected feeders
76
Radial feeders 4 Cable feeders 6 Total 86
2. A/R to be provided in the following feeders:
Breaker problem
4 Breaker procurement is under progress and will be replaced with in one year.
Communication network to be provided
11 Pending due to non availability of Communication network and will be completed within 6 months.
Total 15
8
KSEB
Details of 220 kV feeders where A/R was not implemented are as follows:
Sl. No.
Feeder Name Status of A/R facility
Remarks
1 220 kV Kozhikode-PG – Areacode line-1
Short lines; Current Differential Protection provided; so A/R not provided.
2 220 kV Kozhikode-PG – Areacode line-2
3 220 kV Kozhikode-PG – Areacode line-3
4 220 kV Shornur – Areakode NIL Optical fibre link work under progress, SDH equipment under tendering, Protection coupler to be purchased. Expected to be commissioned during August 2017.
5 220 kV Brahmapuram – Cochin line-1
Not enabled Due to dangerous condition of multi-ckt tower auto-reclosing facility was kept in switched off condition. Will be enabled after completing the rectification work. The tower rectification work re-tendered.
6 220 kV Brahmapuram – Cochin line-2
Not enabled
7 220 kV Cochin – Kalamassery line-1
Not enabled
8 220 kV Cochin – Kalamassery line-2
Not enabled
9 220 kV New Pallom – Pallom line
Very short line; Pilot wire protection implemented; auto-reclosing facility not provided.
Annexure-V
Minutes of the 62nd
Meeting of PCSC held on 15th
March, 2017 Page 8
9 NTPC - Ramagundam 400 kV lines (for Tie-CB’s): Details not provided.
10 NPCIL (Kudankulam NPP)
As agreed in SRPC meetings, A/R has not been kept in service from KKNPP end on 400 kV KKNPP – Madurai line.
Presently, A/R has not been kept in service on the TTPS bound 230 kV line as TTPS is a generating station.
The matter of providing A/R on SRPudur bound 230 kV line has been taken up taken up with NPCIL Management and the action plan for implementing the same will be furnished in by next PCSC-63 meeting.
NPCIL (MAPS) A/R on all four 230 kV lines would be put into service by July, 2017.
11
NLCIL 400 kV lines & 220 kV lines: Details not provided.
8 UPCL The A/R in 220 kV lines at UPCL end has already been configured and scheme is ready.
On completion of AR readiness at opposite end (Kemar) the A/R can be put in service.
9 JSWEL A/R functionality is available at JSWEL on both 220 kV JSWEL–
Lingapur lines. However, the same has not been kept in service due to (i) non-provision of the same from Lingapur end, and (ii) carrier protection issues.
In this regard, APTRANSCO and TSTRANSCO were requested to furnish details regarding status of implementation of A/R in their respective networks at the earliest.
Further, APGENCO, APTRANSCO, TSGENCO, TSTRANSCO, TANGEDCO, TANTRANSCO, NTPC (Ramagundam), NLCIL, NPCIL (KKNPP), UPCL, JSWEL were requested to furnish action plan for implementing A/R in their respective networks as high-lighted (in red-colour) above.
It was noted that the main issues in implementing A/R are the adopted conservative protection philosophies, lack of proper PLCC communication, and breakers’ suitability/ supportability. In this regard, it was clarified that if there are no issues w.r.t. carrier communication and breakers’ supportability, concerned Constituents shall make efforts to implement A/R immediately in their respective networks. Where communication & breaker related issues stand in the way of implementing A/R, concerned Constituents shall take steps to address them appropriately on priority basis, and implement A/R in their respective networks in a phased manner at the earliest.
8. Non-operation of SPS for Kudankulam NPP (KKNPP) Unit-2 on 23.02.2017
The following SPS, finalized in the 56th meeting of PCSC held on 03.08.2016, had been put into service by NPCIL to deal with the contingency of tripping of Units at KKNPP:
SPS for the Contingency of Tripping of Units at Kudankulam NPP
Contingency Action
Annexure-V
SOUTHERN REGIONAL POWER COMMITTEE
BENGALURU
Minutes of the Meeting of Protection System Analysis Group - 14 (PSAG-14) held
on 16th December, 2015 at MAPS, Kalpakkam
a) The Protection System Analysis Group (PSAG-14) meeting was held on 16th December, 2015 at
Madras Atomic Power Station (MAPS), Kalpakkam. Shri R. Satyanarayana, Chief Superintendent,
MAPS welcomed the members and participants. The List of Participants is enclosed at
Annexure - I.
b) MAPS on 230 kV side is equipped with 2x265 MVA, 230/16.5 kV GTs, 2x25 MVA, 230/7 kV SUT’s
four grid connected feeders, [viz., 230 kV MAPS – SP Koil line-1 (L-1); 230 kV MAPS – SP Koil line-
2 (L-2); 230 kV MAPS – Arani line (L-3); and 230 kV MAPS – Acharapakkam line (L-4)], two
radially connected feeders to IGCAR through 2x25 MVA, 230/33 kV transformers, and one
radially connected UG cable to BHAVINI. The station is equipped with two buses named Main
Bus and Transfer Bus. There is a bus sectionalizer on the Main Bus. Functionally, Station is
operating on Single Bus. The Station SLD is enclosed at Annexure-II.
c) S.P. Koil SS on 230 kV side is equipped with a Main bus and Auxiliary bus with Bus-coupler. There
are six feeders emanating from this substation, viz., MAPS - 1 & 2, Kalavindapattu, Veerapuram,
Oragadam, and Tiruvalam. Functionally, Station is operating on Single Bus. The Substation SLD
is enclosed at Annexure-III.
d) MAPS personnel delivered a presentation regarding the Grid Disturbance that occurred on
09.11.15.
The following issues were deliberated in the meeting:
A. Action taken by MAPS and TANTRANSCO w.r.t the recommendations given by the System
Studies Sub-Group of SRPC in its meeting held on 25.06.2014 (Minutes issued vide SRPC
letter no: SRPC/SE/ SG/2014/5885-86 dated 26.06.2014)
The compliance status of the said recommendations as informed to the PSAG-team is enclosed at
Annexure-IV.
B. Analysis of the Grid Disturbance that occurred at S.P. Koil & MAPS on 09.11.2015
It is brought out with concern that MAPS have not uploaded the copies of DR / EL / Numerical relay
indications / SoE in the required manner in to the web portal of SRLDC for detailed analysis. MAPS
confirmed that the same will be strictly ensured in future.
1. 230 kV Kalapakkam – Arani line (L3):
The line tripped at 18:28 hrs on 08.11.15 first on B-E fault (fault current 15.69 kA) due to DPR, Z1
operation at a distance of 62.74 m from MAPS. The line was kept holding from Arani end. As the line
was in charged condition from Arani end, MAPS personnel had tried to charge the line by closing the
Annexure-II
corresponding line-CB at 18:55 hrs. However, the line tripped again on B-E fault (fault current 15.39
kA) due to DPR, Z1 operation at 82.5 m from MAPS end.
Cause of the event: On field visit, it was observed the B-ph (RYB) Tension insulator at 1st tower
towards switchyard end got broken, and on impact over head conductor clamp at tower end got cut
and conductor had fallen on ground causing ground fault. It was found that the stem of ball-and-
socket assembly got fully corroded and pin got broken even for the moderate wind speed.
Action taken:
Line-3 was declared faulty and message given to TNEB for attending the fault. TNEB team arrived on
09.11.15 and replaced the tension insulator string with a new one and reconnected the conductor
using jumper. Line-3 was taken back in to service at 21:45 hrs on 09-11-2015.
Issue: Line tripped at MAPS end only, and was holding from Arani end.
Explanation: The snapping of conductor created a Ph-Ground fault for MAPS, and Open-conductor
fault for Arani. Due to this, even though protection at MAPS end acted in time to result in 3-ph trip
at MAPS and consequent sending of carrier to Arani end, protection at Arani end neither sensed the
fault nor received the carrier. Similarly, as the above fault resulted in 3-ph trip at MAPS, broken-
conductor condition could not be sensed by the protection at Arani end, even though the same has
been kept enabled for Alarm.
Accordingly, it is found that the operation of the protection system is in order.
2. 230 kV MAPS – Acharapakkam line (L4):
Line tripped at 08:21 hrs on 09.11.2015 on Y-B fault due to DPR, Z1 operation at a distance of 352
mts from MAPS end.
Cause of the event:
For line-4, the portion between MAPS 1st tower to 2nd tower after crossing main road for Y and B
phases got cut and fallen on ground on the road, obstructing movement of vehicle on main road. For
Y-phase, tension string insulator at 1st tower got cut, and on impact the conductor clamp at 1st tower
end got cut and conductor had fallen on ground. For B-phase, tension string insulator at 2nd tower
got cut, and on impact the conductor clamp at 2nd tower end got cut and conductor fallen on
ground. It was found that the stem of ball-and-socket assembly got fully corroded and pin got
broken even for the moderate wind speed.
Action taken:
Line-4 was declared faulty and message given to TNEB for attending the fault. On 1st tower, the
tension insulator string was replaced for Y phase, and the conductor was reconnected using jumper.
On 2nd tower, the tension insulator string was replaced with spare and conductor was reconnected
using a jumper. Line 3 was taken back in to service at 23:45 hrs on 09.11.20 15.
Accordingly, it is found that the protection system operated correctly.
3. 230 kV MAPs – SP Koil line (L2):
As per MAPS, the line tripped at MAPS end at 8:50 hrs on 09.11.2015 on B-E fault due to DPR, Z1
operation at a distance of 8.347 km from MAPS.
Annexure-II
As per TANTRANSCO, the line tripped at 9:06 hrs on 09.11.2015 on B-E fault due to DPR, Z2, Carrier-
Aided-Trip operation.
Issue: Even though the line tripped at 9:06 hrs, it could not be normalized till 10:45 hrs due to
apparent breaker problem at SP Koil end.
TANTRANSCO representative informed that there was a false SF6 gas pressure low alarm for
line-1 CB, which the operator mistook for line-2. As there was a heavy downpour accompanied
by strong winds outside, the shift personnel took time in mobilizing their resources to inspect
the switchyard and attend to the problem. Finally, the line was restored by 10:45 hrs.
It is noted that though the tripping of line is with correct operation of respective protection system,
the attempt for immediate trial charging could not be done due to misunderstanding of the Sub-
station operator during heavy rain. The situation could have been averted, had A/R been enabled at
both ends in line with CEA’s Technical Standards and insistence of SRPC forum in various PCSC
meetings.
4. 230 kV MAPS – SP Koil line (L1):
As per MAPS, the line tripped at 9:32 hrs on 09.11.2015 on Y-E fault due to DPR, Z1 operation at a
distance of 9.15 km from MAPS.
As per TANTRANSCO, on 09.11.2015 since 06:00 hrs the line-CB at SP Koil end on SP Koil – MAPS
line-1 was under lock-out due to Compressor’s low air-pressure. Subsequently at 09:32hrs., line fault
occurred in the above feeder; however the breaker had not tripped due to lock-out condition; as a
result, LBB relay acted and tripped all the 230kV feeders & all the four Auto-transformers. From the
DR furnished by TANTRANSCO, it was seen that LBB protection had taken 560 msec for its operation.
Issues:
The breaker of 230kV SP.Koil-MAPS feeder-1 at SP Koil end was under lock-out due to air-pressure lock-out of the compressor since 6:00 am on 09.11.2015, but no actions were taken at SP Koil end to rectify the same till the occurrence of the line fault at 9:32 hrs.
LBB protection acted with a delay of 560 msec.
TANTRANSCO representative informed that due to shorting of supply cable to Compressor
motor, air pressure lock-out occurred for Compressor.
The fault current had persisted for 560 msec due to sluggish operation of LBB relay, and the
matter was taken up with their OEM and would soon revert on the action taken.
In this regard, TANTRANSCO is recommended to provide (i) separate alarm window for Air
Pressure & SF6 Pressure indication in the Sub-station (SP Koil) Control room, and (ii) Standby
Compressor arrangement in all critical sub-stations like SP Koil.
5. Tripping of both Units at MAPS:
With the tripping of Acharapakkam line (L-4) at 8:20 hrs on 09.11.2015, Reactors’ power was
reduced in both units by 5%. Currents on lines 1, 2, 3, and 4 were monitored and maintained at
(400/360/0/0) AMPS respectively.
Subsequently, when the SP Koil line-2 (L-2) also tripped at 9:02 hrs on 09.11.2015, the current on
the only remaining line (L-1) shot up to over 500 A due to which both Units’ small dump valves
Annexure-II
opened; as a result, generation got reduced to 130 / 112 MW (e) and line current on L-1 was
brought down to 480 Amps.
Finally, when the only evacuating line, viz., SP Koil line-1 (L-1) also tripped at 9:32 hrs, both units got
tripped on high frequency and total class IV failure. Both Reactors also got tripped on high boiler
delta-T.
From the above, it is observed that had one Unit been withdrawn on tripping of three evacuating
lines, the station could have survived on house load with one Unit in service during the loss of
evacuation of the station (i.e., during tripping of the fourth line). Therefore, for the survival of the
nuclear station, it is always advised to ensure generation level of MAPS without compromising (n-1)
condition of evacuation system.
C. General Operational & Protection Issues pertaining to MAPS in the context of the Grid
Disturbance that occurred on 09.11.2015
1. Replacement of Disc type string insulators on all the 230 kV lines emanating from MAPS.
It is seen that Arani & Acharapakkam lines tripped due to the failure of disc type string insulators of
the 230kV towers at MAPS end due to wear of ball and socket assembly on corrosion. Also there are
more no. of jumpers existing on lines 3 & 4 at first & second towers from MAPS end.
To this, TANTRANSCO informed that for the total 688 towers, 159 cut joints had already been
replaced. The work relating to replacement of disc type string insulators by polymer type at all
tension towers is already under progress, and will be completed by April, 2016. The action plan for
the same at all suspension towers will also be furnished shortly.
In this regard, TANTRANSCO is recommended to furnish their comprehensive plan for replacing
disc insulators by polymer type at all tension and suspension towers on all the 230 kV lines
emanating from MAPS before the 50th Protection Co-ordination Sub-Committee (PCSC) meeting
scheduled to be held on 27th January, 2016.
2. Improving the flow/ exchange of information between MAPS and TANTRANSCO substations for
the faults occurring on the connecting lines.
Between the trippings of MAPS – SP Koil line-2 (L2) at 9:06 hrs and SP Koil line-1 (L1) at 9:32 hrs on
09.11.15, it is seen that due to delay in exchanging proper information on the fault data, opportunity
has been lost in taking the necessary remedial action to bring back MAPS - SP Koil line-2 into service.
As the shift personnel at SP Koil end were under the impression that the line CB was under lock-out
due to SF6 pressure low, proactive action was not initiated even though MAPS personnel had tried to
contact them over phone. It is seen that even though MAPS was already operating under depleted
network conditions at the time of tripping of SP Koil line-2 [due to tripping of MAPS – Arani line (at
18:28 hrs on 08.11.2015) and MAPS – Acharapakkam line (at 08:21 hrs on 09.11.2015)], concerned
shift personnel have not shown the alertness required in handling the distressed system. It was
emphasized that to avoid similar incidents in future, better vigilance and alertness need to be
exercised by the shift personnel.
Annexure-II
In this regard, it is agreed by MAPS and TANTRANACO that whenever any fault takes place on the
transmission lines between MAPS and TANTRANSCO substations, the relevant fault data, viz.,
location, zone, magnitude and phase of the fault current will be mutually exchanged, within 10 –
15 minutes. Parallelly, the concerned shift personnel will also put efforts to get first hand
information on the condition of the equipment involved by physically inspecting the yard. Thus
both the ends shall ensure trial charging of the line within 15 (Fifteen) minutes of tripping of the
element, if the tripping was on single phase fault.
3. Providing dual AC supply to Compressor Motor and redundant Compressor Unit.
It is seen that the lock-out of the SP Koil end line-CB on the MAPS – SP Koil line – 1 (L1) happened due
to air lock-out of the Compressor unit, which in turn occurred because of the failure of the
Compressor Motor due to shorting of its supply cable. Had the redundancy been provided to the
supply to the compressor motor and/ or the Compressor unit, the breaker’s lock-out could have been
prevented.
In this regard, TANTRANSCO is recommended to provide (i) dual AC supply to Compressor unit of
the CB’s, and (ii) a redundant/ standby Compressor unit that would automatically takeover in case
the main unit stops functioning at SP Koil end for the CB’s on the MAPS-bound lines 1 & 2.
As SP Koil is essentially on single-bus operation, the issue of providing bus-sectionalizer CB was also
discussed. To this, it was informed that as SP Koil was a very old station, there was no space available
to make way for bus-sectionalizer. TANTRANSCO is advised to consider the possibility of providing
bus-sectionalizer breaker arrangement during renovation.
It was also noticed that DG-set had been kept in manual mode during tripping event at SP Koil. As
this is not desirable for handling emergency situations, TANTRANSCO is recommended to keep DG
set always in auto-mode at its SP Koil SS.
4. Carrier communication/ PLCC related issues on 230kV MAPS-Arani line (L-3).
It is noted that MAPS have not provided any relevant files like Event Logger and Disturbance
Recorder to verify the issues relating to carrier communication on 230 kV MAPS – Arani line.
However, to ensure healthiness of carrier communication on L-3, the following is recommended to
be carried out by MAPS and Arani SS personnel in coordination:
Healthiness of PLCC system components (hardware and software) at both ends shall be
checked and faulty components shall be repaired/ replaced.
End-to-end communication for DT/ permissive & other signals may be ensured by testing at
both the ends.
5. Status of providing Line CVT’s in the Y phase of all feeders excepting SP Koil-2.
This is one of the recommendations given by the audit team that carried out protection audit of
MAPS switchyard in the year 2012. TANTANSCO informed that the procurement of line CVTs had
been completed, and line CVT’s would be commissioned soon. To this, TANTRANSCO was requested
to furnish the schedule of commissioning of line CVT’s before the 50th PCSC meeting scheduled to be
held on 27th January, 2016.
Annexure-II
6. Provision of Auto-reclosure (A/R) on all 230kV lines emanating from MAPS.
TANTRANSCO informed that though A/R is available at their end on all evacuating lines of MAPS, the
same was not put into service in view of MAPS decision to not to provide A/R at their ends.
MAPS informed that due to the possibility of damage to/ reduction in life of turbine and generator
rotor, NPCIL management have decided not to keep A/R in service on all 230 kV lines emanating from
their Nuclear stations.
It is noted with concern that in spite of the CEA’s mandated requirement of providing auto-reclose on
all 220 kV/ 230 kV lines, and the earlier recommendation of sub-Group which held its meeting on
25.06.2014 to that effect, A/R has not been put into service on any of the four evacuating lines of
MAPS by TANTRANSCO as well as MAPS at their respective ends.
In this regard, SRLDC mentioned that either single phase A/R scheme or three phase A/R scheme as
felt appropriate by MAPS can be implemented at MAPS end. However, if MAPS feels that attempt for
A/R is to be prevented strictly from MAPS end, then a ‘Lead-Follow’ three phase A/R scheme could
be followed by MAPS to comply with CEA’s standards and maintain grid discipline. It was explained
that the proposed lead-follow A/R scheme would effectively take care of chances of generating end
closing on to a permanent fault. In this master-follower A/R supervision scheme, the grid-station end
would reclose first, and send a permissive-signal to the generating end on successful auto-reclosure.
By ensuring that the generating end would reclose only after the receipt of the permissive signal
from the remote end after a predetermined time (say 1.5 sec, this shall be less than the pole
discrepancy relay operation time), the chances of it closing on to a permanent fault can be
eliminated. In the event of non-receipt of carrier signal, the generating end can go for 3-ph trip. In
this regard, the Topic 6.1 on Common Considerations for Auto-reclosing of the IEEE Guide for
Automatic Reclosing of Line Circuit Breakers for AC Distribution and Transmission Lines may be
referred to. It was reiterated that as providing auto-reclose on all 220 kV/ 230 kV lines is mandatory
under Regulation 43 (2) (c) of CEA’s “Technical Standards for Construction of Electrical Plants &
Electric lines”, action plan for providing A/R on all 230 kV evacuating lines of MAPS has to be
provided by MAPS.
It is therefore recommended that MAPS shall take up the issue of providing lead/follow A/R
scheme on its 230 kV evacuating lines with their Management and present their action plan for
implementing the same before the 50th meeting of PCSC scheduled to be held on 27th January, 2016.
7. Ensuring Grid Connectivity of MAPS.
MAPS informed that the following mechanism exists at MAPS to bring down generation in case of
tripping of evacuating lines of MAPS:
When two of the four evacuating lines go out, 5% reduction in generation output is effected.
It was, however, informed that due to the limitation imposed by nuclear reactor’s controls, such
reduction can at most be sustained for a period of 30 minutes before which requisite action
should be taken to bring back lines into service, lest the reactors may get poisoned out.
Under these conditions, when one more line goes out, and the flow on the only remaining line
crosses 500 Amps, generation output is further reduced to 130/112 MW in each Unit by venting
Annexure-II
out the excessive steam (by opening small dump valves), and the current will be brought down
to 480 Amps.
It was, however, informed that such operation can be entertained for at most 15 minutes before
which requisite action should be taken to bring back lines into service, lest the reactors may get
poisoned out.
At MAPS, the power from 2x220 MW Units is being evacuated through the following four
evacuating lines (Kunda type conductors with 213 MVA rating), viz.,
(i) 230 kV MAPS – SP Koil line-1 (L-1);
(ii) 230 kV MAPS – SP Koil line-2 (L-2);
(iii) 230 kV MAPS – Arani line (L-3); and
(iv) 230 kV MAPS – Acharapakkam line (L-4).
In addition to above, there is one radially connected Under Ground (UG) Cable to BHAVINI to supply
start-up and commissioning power to BHAVINI. The cable has been provided with line differential
protection as primary protection and over current and earth fault protections as back-up
protection.
From the above, the non-availability of (n-1) when two of the four evacuating lines get tripped is
quite apparent. To provide (n-1), the combined generation of two Units has to be brought down to
200 – 210 MW. However, as brought out above, the generation can only be brought down to 130/
110 MW in each Unit (thus 260/220 MW in total) by resorting to extreme contingency measure of
venting out excessive steam, which operation can be sustained for at most 15 minutes without any
of the Reactor’s getting poisoned out. Moreover, once such a thing happens, it takes one-to-three
days to bring Units back on to bars.
It was therefore originally proposed to utilize the existing UG Cable between MAPS and BHAVINI to
its fullest capacity by connecting it to the grid at BHAVINI. However, considering its rating (133 MVA
or 106 MW), it can be seen that (n-1) will not be fulfilled even after connecting this Cable to grid
when MAPS operates with two evacuating lines.
Considering the above limitations, and the need to ensure better connectivity of MAPS to grid, it is
proposed to lay a Single-Circuit Over-Head Transmission Line with Twin-Moose type Conductor
along the RoW of the present UG Cable. As the distance between MAPS and BHAVINI is only 800
mts., the proposed S/C over-head transmission line would be the ideal solution in the long-term to
evacuate power from MAPS with (n-1) even after losing the two out of the four existing evacuating
lines. MAPS and BHAVINI are therefore recommended to examine this proposal, and, after
obtaining the consent of their respective managements, are requested to approach SP&PA
Division of Central Electricity Authority to get the scheme ratified in the Standing Committee on
Power System Planning for Southern Region (SCPSPSR) for implementation. Till such time, MAPS
is recommended to maintain the generation level such that the line loading of available
evacuation system will always satisfy the requirement of ‘n-1’ criteria. In the process, if the
situation requires withdrawing one of the two Units, the same may be followed by MAPS to avoid
tripping of both Units on loss of evacuation.
Annexure-II
The necessary system studies to make out a strong case for the above proposal have been carried
out, and are presented at Annexure-V. The assumptions made and the scenarios considered for
the above studies are detailed below:
Assumptions made/ Data considered:
(i) The following UG Cable characteristics as informed by BHAVINI have been considered:
Sl. No.
Description Value
1 Rating Voltage: 230 kV (Max. 245 kV) Current: 850 A in air 646 A in duct 335 A when directly buried in ground [Cable is directly buried in ground]
2 Length of the Cable 3 runs of 800 mt. cable
3 Conductor Max. DC Resistance per km
(i) At 20°C 0.047 Ω/ km (ii) At 90°C 0.0614 Ω/ km
4 Positive & Negative sequence reactance per km 0.0614 + j 0.195
5 Zero sequence data per km 0.0117 + j 0.133
6 Protection equipment rating at both ends of the Cable VT – 100 VA; CT – 30 VA
(ii) Share of various States in BHAVINI’s first Unit of 500 MW capacity has been considered as
follows:
(iii)Expected commissioning schedule of the first Unit of BHAVINI (of 500 MW capacity) has been
taken as September, 2016.
(iv)The Ex-bus generation considered for MAPS and BHAVINI are 2x200 MW and 1x450 MW
respectively.
(v) For the studies with & without generation at BHAVINI, present operational base-case only has
been considered, as the effect of transmission elements that would get added to the grid by
September, 2016 would be minimal on the existing 230 kV network in & around MAPS.
Andhra Pradesh + Telangana 132 MW
Karnataka 72 MW
TamilNadu 167 MW
Kerala 43 MW
Puducherry 11 MW
Unallocated Power 75 MW
Annexure-II
Various Scenarios considered:
Sl. No.
CASE No. Scenario considered Line flow violations
1 Base Case (BC) MAPS with L1, L2, L3 & L4 in service NIL
2 CASE-1 BC + Outage of [L1] NIL
3 CASE-2 BC + Outage of [L1 + L3] 235 MW on L2
4 CASE-3 BC + Outage of [L1 + L3 + L4] 400 MW on L2
5 CASE-4 (BC1) BC + 230 kV MAPS – BHAVINI Cable NIL
6 CASE-5 BC1 + Outage of [L1] NIL
7 CASE-6 BC1 + Outage of [L1 + L3] NIL
8 CASE-7 BC1 + Outage of [L1 + L3 + L4] 320 MW on L2
9 CASE-8 [= New Base Case (NBC)]
Base Case (BC) + 450 MW generation at BHAVINI
NIL
10 CASE-9 NBC + Outage of [L3] NIL
11 CASE-10 NBC + Outage of [L3 + L2] 215 MW on L1
12 CASE-11 NBC + Outage of [L3 + L2 + L1] 400 MW on L4
13 CASE-12 (NBC1) NBC + 230 kV MAPS – BHAVINI Cable NIL
14 CASE-13 NBC1 + Outage of [L3] NIL
15 CASE-14 NBC1 + Outage of [L3 + L2] 209.6 MMW on L1
16 CASE-15 NBC1 + Outage of [L3 + L2 + L4] 363.3 MW on L1
17 CASE-16 (BC2) Base Case (BC) + 230 kV MAPS – BHAVINI Twin Moose S/C line
NIL
18 CASE-17 BC2 + Outage of [L1] NIL
19 CASE-18 BC2 + Outage of [L1 + L2] NIL
20 CASE-19 BC2 + Outage of [L1 + L2 + L3] NIL
21 CASE-20 BC2 + Outage of [L1 + L2 + L3 + L4] NIL
22 CASE-21 (NBC2) Base Case (BC) + 450 MW generation at BHAVINI + 230 kV MAPS – BHAVINI Twin Moose S/C line
NIL
23 CASE-22 NBC2 + Outage of [L1] NIL
24 CASE-23 NBC2 + Outage of [L1 + L2] NIL
25 CASE-24 NBC2 + Outage of [L1 + L2 + L3] NIL
26 CASE-25 NBC2 + Outage of [L1 + L2 + L3 + L4] NIL
Annexure-II
Short Circuit Studies for various scenarios have also been carried out and tabulated below:
Since both MAPS and BHAVINI stations have been designed for a Short Circuit Level of 10,000 MVA, it
can be concluded from the above that laying of Twin-Moose type S/C Over-Head transmission line
between MAPS and BHAVINI poses no problem.
8. Furnishing of tripping details in compliance of Regulation 5.2 (r) of IEGC, and providing monthly
status of healthiness of batteries
MAPS’s attention has been brought to their obligation of fulfilling requirements under Regulation
5.2 (r) of IEGC, as per which all Users, STU/ SLDC, and CTU are required to furnish for analysis
purpose the relevant information relating to tripping events in their system along with Disturbance
Recorder (DR) and Event Logger (EL) to SRLDC/ SRPC within 24-hrs of occurrence of the same. Though
this issue was regularly brought to Constituents’(including MAPS) attention vide various SRLDC &
SRPC (fort-nightly) letters, still data w.r.t. all events was either not being furnished or being made
available with unacceptable delay of few weeks.
MAPS is recommended to upload various tripping files (FIR/ DR/ EL/ TR) whenever any tripping
involving their station takes place in SRLDC’s web-portal within 24-hrs of the occurrence of the
tripping event in compliance of Regulation 5.2 (r) of IEGC.
9. Patrolling Protocol/Guidelines for Over Head Transmission Lines:
SRPC brought to the notice of TNEB regarding the Patrolling Protocol/Guidelines for Over Head
Transmission Lines to be followed by them. It was noted that in compliance of Hon’ble CERC Order
dated 20.02.2014 in respect of Petition No. 146/MP/2013 wit IA 36/2013, Patrolling
Protocol/Guidelines for Over Head Transmission Lines had been formulated by SRPC Secretariat in
due consultation with all the stake holders and the same had been communicated to Hon’ble CERC
and all the Transmission Utilities (Central/State) vide SRPC letter dated 21.05.2014 with a request to
strictly follow the guidelines. It was noted that as per Guidelines, each transmission utility should
furnish the Annual Schedule of Patrolling to SRPC/SRLDC along with Annual Outage data by October
each year and compliance report of the patrolling/maintenance carried out during previous month
with respect to schedule would be furnished to SRLDC/SRPC in the OCC Meeting.
TANTRANSCO agreed to follow the same and requested SRPC to kindly furnish a copy of the
Patrolling Protocol/Guidelines for Over Head Transmission Lines to help in their needful action. In
this regard, a copy of the sought Guidelines is enclosed at Annexure-VI.
Annexure-II
10. Line Clearance issues:
The following suggestions/recommendations given by the System Studies Sub-Group of SRPC which
held its meeting on 25.06.2014 regarding line clearance were reiterated:
Information regarding the lines kept open in MAPS vicinity to be informed to MAPS. Restoration
of the same also may be informed pertinently.
If any line clearance (LC) is there in downstream/upstream MAPS area for maintenance, then
further opening of the lines which may cause non availability of evacuation lines from MAPS have
to be restricted for avoiding undesired island formation of MAPS generation with TANTRANSCO
loads/House Load operation of MAPS Units / Poisoning of Units etc.
11.Providing information relating to line outages and Declared Capacity (DC) revision in case of
generating Unit outages
SRLDC mentioned with concern that revision of DC by MAPS is not being done by MAPS as and when
there is tripping / synchronization / change in level of generation. This lead to operational difficulties
as well as huge financial implication on the constituents when the corrections were incorporated
post facto. MAPS assured for necessary action in this regard and strict compliance in future.
The issue of not providing proper information to SRPC/ SRLDC regarding line outages and in case of
line outages by TANTRANSCO was also discussed. TANTRANSCO assured that they would take
effective steps to ensure that such lapses won’t take place.
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Annexure-II