Draft SPECIFICATION NO. TI/SPC/PSI/PROTCT/4051 Effective From: Page 1 of 71 GOVERNMENT OF INDIA MINISTRY OF RAILWAYS Specification No. TI/SPC/PSI/PROTCT/4051 FOR CONTROL AND RELAY PANEL FOR PROTECTION SYSTEM OF MUMBAI SUBURBAN AREA FOR 50 HZ AC TRACTION POWER SUPPLY SYSTEM INCLUDING PARALLEL OPERATION ON 25 KV SIDE Issue date: ISSUED BY RESEARCH DESIGNS & STANDARDS ORGANISATION, MANAK NAGAR, LUCKNOW-226011. 111008/2020/O/o PED/TI/RDSO 360
Transcript
Draft SPECIFICATION NO.
TI/SPC/PSI/PROTCT/4051 Effective From: Page 1 of 71
GOVERNMENT OF INDIA
MINISTRY OF RAILWAYS
Specification No. TI/SPC/PSI/PROTCT/4051
FOR CONTROL AND RELAY PANEL
FOR PROTECTION SYSTEM
OF MUMBAI SUBURBAN AREA FOR
50 HZ AC TRACTION POWER SUPPLY SYSTEM
INCLUDING PARALLEL OPERATION ON 25 KV SIDE
Issue date:
ISSUED BY
RESEARCH DESIGNS & STANDARDS ORGANISATION, MANAK
NAGAR, LUCKNOW-226011.
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SPECIFICATION FOR Control and Relay Panel for Protection System for 50 Hz AC
Traction Power Supply System including Parallel Operation on 25 KV Side
SPECIFICATION No. TI/SPC/PSI/PROTCT/4050
Amendment Amendment /Revision Total pages Date of Issue
Number including
drawings
0 NA 74 14.10.2005
1 A&C Slip No.1 75 24.10.2016
S.No. Stages / activities for preparation of specification Date sent
1. Meeting held between M/s Tata Power Co., WR, CR and 23.06.2005
MRVC at Mumbai regarding power supply at 110 kV and
paralleling on 25 kV side with associated protection
2. Draft specification sent to manufacturers, ABB, ALSTOM, 07.07.2005
SIEMENS, ALIND and ASHIDA for comments /
suggestions by e-mail
3. Draft specification sent to CR, WR and MRVC for 08.07.2005
comments / suggestions by e-mail
4. Meeting held between RDSO and Relays Manufacturers 29.08.2005
ABB, ALSTOM, ALIND and ASHIDA held at RDSO
5. Draft specification sent to Railway Board for approval 14.09.2005
SPECIFICATION No. TI/SPC/PSI/PROTCT/4051
PREPARED BY CHECKED BY APPROVED BY
SIGNATURES
DATE
DESIGNATION SSE/TI Dir/TI-3 PED/TI
*This Specification is the property of RDSO. No reproduction shall be done without the
permission of DG (TI) RDSO.
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INDEX
ITEM HEADING PAGE
N O
1 . SPECIAL REQUIREMENT FOR MUMBAI SUBURBAN AREA 5
2 . SCOPE 7
3 . TRACTION POWER SUPPLY SYSTEM 8
4 . SERVICE CONDITIONS 13
5 . DESIGN FEATURES 14
6 . SCHEME OF PROTECTION 28
7 . DETAILS ON PROTECTION OF INCOMING H.V. LINES 32
8 . DETAILS OF PROTECTION SCHEME FOR TRACTION 33
TRANSFORMER
9 . DETAILS OF SCHEME OF PROTECTION FOR 25 KV 35
OVERHEAD EQUIPMENT
10 . INSPECTION AND TESTING 43
11 . ERECTION, COMMISSIONING AND PROOVING TESTS 45
12 . TECHNICAL DATA AND DRAWINGS 46
13 . OPERATION & MAINTENANCE, INSTRUCTIONS & TRAINING 47
14 . WARRANTY 48
15 . SERVICE SUPPORT AFTER WARRANTY AND AMC 48
16 . SPECIFICATION CONFIRMATION 49
17 . TENDER’S CREDENTIALS 49
18 . IMPORTED RELAYS 49
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ANNEXURES
ANNEXURE 1 ABBREVIATIONS USED. 50
ANNEXURE 2 DEFINITIONS 51
ANNEXURE 3 GOVERNING SPECIFICATIONS 53
ANNEXURE 4 SCHEDULE OF GUARANTEED PARTICULARS 55
ANNEXURE 5 MATERIAL SCHEDULE 67
ANNEXURE 6 MUMBAI AREA POWER SUPPLY SCHEMATIC 71
ANNEXURE 7 PROTECTION SCHEME FOR TSS, SSP AND SP 72
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1. SPECIAL REQUIREMENT FOR MUMBAI SUBURBAN AREA
Electric traction in suburban areas of Mumbai presently employs 1500 Volts D.C. and the
network is being converted to utilize 25 kV AC for the railway traction system. In the
existing D.C system, the overhead equipment (OHE) is supplied power at 1500 volts from
rectifier fed traction sub-stations (TSS) with normally no sectioning; the sub-stations thus
are connected in parallel. In an event of failure of one of the TSSs the supply is maintained
from adjacent TSSs. Total supply interruption for sub-urban trains (EMUs) and the D.C.
locomotive hauled main line trains is rare. 1.1. The conventional 25 kV AC 50 Hz traction system on Indian Railways draws power from
two of the three phases of the incoming E.H.V. lines and transforms it to 25 kV, earthing
one of the secondary terminals of the transformer. Power is drawn from different phases
at adjacent TSSs, cyclically, to balance the load. The separation of phases is carried out on
the OHE contact wire system by provision of “neutral sections” which do not draw power
and mechanical continuity for passage of the pantograph of the motive power unit is
ensured. The Loco Pilots of trains are instructed to switch off the on- board 25 kV circuit
breakers to prevent flashovers while the pantographs negotiate the neutral sections.
Tripping of the feeder circuit breakers (CB) is associated with supply interruption over the
feed zone. Auto Phase Switching Section (APSS), comprising of 3 overlaps in place of
Neutral Section are also provided for separation of different phase supply from adjacent
TSS. The Loco Pilot has not switch off on board 25 kV circuit breakers while negotiating
the APSS. The APSS is provided as per the RDSO Specification No.
TI/SPC/PSI/NCLR/0190 in between the adjacent TSS. 1.2. The train movement (traffic density) in the sub-urban area of Mumbai is very high and the
requirements are therefore different from those of the conventional system with emphasis
on a protection system offers a reliable OHE supply, is capable of isolating the shortest
possible section in the fastest possible manner and localize a fault with minimal human
intervention. The spacing of signals and stations at short intervals and the short headway
between trains does not lend itself to the adoption of the conventional 25 kV AC supply
scheme, drawing power from different phases and the electrical separation on 25 kV side
through neutral sections.
1.3. In 31st MSG, it was decided to provide testing jack facility in the Control & Relay Panel.
It is to be developed in a such way that when testing kit is connected to the testing jack,
relay connections will get disconnected from main circuit automatically and connected to
testing circuit. After testing and removal of testing kit from jack, relays will get
reconnected to main circuit automatically.
This specification is prepared on the basis of earlier specification no.
TI/SPC/PSI/PROTCT/3003 and considering the suggestions / recommendations of
consultant to MRVC (Frischmann Prabhu (India) Pvt. Ltd., EPD Consultants, UK and DE-
Consult, Germany) along with latest developments in protection relays and experience of
abroad railways.
1.4. This specification supersedes the specification No. TI/SPC/PSI/PROTCT/3003 &
TI/SPC/PSI/PROTCT/4050 with A&C Slip No. 1.
1.5. The “Make in India” Policy of Government of India shall be applicable.
2. Salient requirements for the Mumbai area summarized below.
i. Traction supply for Mumbai area at different traction substation shall be taken at 110
kV from power supply authority and up to three adjacent traction substations which
draw power from one supply authority and from the same phase may be operated in
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parallel on the 25 kV side of the traction transformers. In service, the “neutral sections”
separating the sectors shall be kept live, there-by avoiding the operational and safety
implications with the conventional neutral sections, during exigencies, however, the
neutral sections can be activated by operating the specific switches/ interrupters/ CBs.
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ii. TSSs are spaced at distances of 6.5 to 20 kms.
iii. Some of the sub-sectors are short, about 1 km.
iv. SP/SSP shall be provided with CB’s in lieu of interrupters so that the smallest possible
section can be isolated & faults localized automatically, with minimal intervention by
the personnel on duty in the control room.
v. The motive power employed on trains, including EMUs, shall be with drives based on
IGBT or GTO based 3 phase converters or silicon rectifier-based D.C. Traction motor
locos. The 3 phase drive motive powers are capable of regeneration during braking
operation. There is possibility of the regenerative currents being fed back into the grid.
vi. The starting currents in case of a number of EMUs starting together at times may
exceed the fault current in event of high impedance faults.
vii. OHE system in Mumbai area is of 4 to 6 lines with arrangement at SSP/SP of bus type
as given in the enclosed drawing at Annexure-6.
viii. OHE is of varying configuration and its line parameters are expected to be different
for different sections. Values of R and X may undergo change with replacement with
different size of wires or addition of new tracks. As parameters of some of the sections
may not be available, the successful tenderer will be required to determine/measure
the critical parameters needed for the protection scheme as may be necessary.
ix. In the Railway traction substation HV circuit breakers shall be provided on the
incoming feeder lines along with bus coupling breaker with associated protection as
different from the conventional 25 kV Traction sub-stations. 3. PRE -BID MEETING
A pre-bid meeting shall be arranged by the purchaser, with eligible tenderers and
associating RDSO & Rlys for clarification on particular requirements of protection to this
specification, parameters of OHE (per km. resistance, reactance values) required for its
functioning, site conditions, erection and commissioning and field proving etc.
It is advised that tenderers visit the sites/sections and familiarize themselves with
the local conditions and understand the requirements of the system in detail, before
tendering their bids. Clarifications as may be necessary shall be obtained from the
purchaser. After the award of the contract the tenderer shall be fully responsible for
successful integration of the protection scheme with the associated scheme of equipment
in the switchyard (TSS, SP, SSP) and the RTUs and any items later considered as essential
for successful integration, shall be within the scope of the supply and work of
the tenderer. In case of any consultancy required by the tenderer for successful
commissioning, tenderer shall arrange it within his scope.
4. SCOPE
4.1. This specification applies to the design, development, manufacture, supply, erection and
field proving & monitoring of “numeric/ micro processor based control and relay panel”
complete with numeric/ micro processor/ static protective relays, for use in the traction
substations and SSP/SPs for control of 110 kV and 25 kV circuit breakers, 25 kV
interrupters and protection of 220 or 132 or 110 kV single phase transformers with 25 kV
nominal secondary voltage, all substation equipment, 25 kV over head equipment (OHE)
feeders and capacitor bank (if asked for by the purchaser in the tender).
4.2. Accordingly, control & relay panels will be required at supply control posts as follow.
i. Traction substation to protect and control incoming HV lines*, traction transformers,
25 kV feeders and 25 kV capacitor banks (if required by the purchaser).
*NB: Protection of HV incoming lines shall be supplied by the concerned supply
authority in a separate panel giving all the necessary control, indication and alarm
contacts on the terminal junction inside the panel. However, HV bus bar protection
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and the connections from the protection panel of supply authority to the C&R panel
for Railways shall be within scope of the tenderer.
ii. SSPs to protect and control 25 kV feeders.
iii. SPs to protect and control 25 kV feeders. 4.3. Scope of supply shall include all parts, fittings and accessories of the control & relay panel
required for normal functioning of the protection system. The panel shall be complete with
numeric-processor based protection package for traction transformers, feeders and for
capacitor banks (optional). The protection relays shall have communication features and
necessary interface equipments are to be provided for its normal functioning and to ensure
sending the fault waveform data stored in the relays at TSS/SSP/SP to remote control
centre through SCADA. 4.4. The control panel have been classified into four categories for the purpose of this
specification, viz.,
TYPE –I: Required at 220/25 kV or 132/25 kV or 110/25 kV traction substations with
single or double ended feeding with line tripping and line sectioning facilities. (with or
without capacitor banks as required by the purchaser)
TYPE-II: Required at 25 kV SP with CB and/or with line tripping and line sectioning
facilities suitable for single ended or double ended feeding.
TYPE-III: Required at 25 kV SSP with CB and/or with line tripping and line sectioning
facilities.
TYPE –IV: For yards, car shed or other areas not covered in the above types.
4.5. The control panels offered shall be an integrated one complete with relays, meters, control
switches, wiring and all accessories and materials necessary for efficient control and
protection of equipment and feeders. All accessories and materials shall be deemed to be
within the scope of this specification whether specifically mentioned or not. 4.6. The specification covers the protection of TSS, SP & SSP and the related substation
equipment and the OHE. Protection of incoming feeder to the TSS from reverse feeding
the faults in the incoming line is included. The specification excludes the protections for
HV incoming lines provided by the electric supply authority as part of the service
connection scheme, however, necessary control/indication/alarm
connections/terminations, inter-tripping and inter-locking is required to be ensured as
specified in clauses 7.1.1. 4.7. Purchaser may consider any proposal for an improvement in the protection scheme.
However, for all such proposals the tenderer shall be required to furnish full technical
detail, drawings etc. to satisfy the purchaser. 4.8. Any changes required in relays and C&R panel during or arising as a result of
commissioning /field proving tests shall be continued to be governed by this specification
and within the scope of supply by the tenderer. 5. TRACTION POWER SUPPLY SYSTEM
5.1. General scheme of traction power supply.
Power in Mumbai area shall be received from the grid network of the supply authority at
110 kV at individual traction substation (TSS) with two nos. traction power transformers.
25 kV power supply for traction is drawn through a single-phase step-down traction power
transformer, the primary winding of which is connected to any two nominated phases of
the incoming three phase lines. On the secondary side, one of the two terminals of the
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25kV winding is connected to the traction overhead equipment, while the other is solidly
earthed and also connected to the running traction rails. The method of connection to the
running traction rails depends on type of signaling track circuit used, and as follows. a) Through an impedance bond offering negligible impedance for power
frequency AC current in case of AFTC.
b) In case of DC track circuiting it shall be directly connected to the traction
return rail.
5.1.1. Each transformer shall have its associated circuit breakers on the primary and 25 kV
sides, with a separate set of 25 kV circuit breakers called “Feeder Circuit Breakers”
for the traction OHE lines; refer Annexure 6. These CB’s can be of outdoor or indoor
type, and employ SF6, vacuum or may be gas insulated type switchgear. 5.1.2. On some sections (single ended supply), adjacent TSS shall be fed from different
phases of the three-phase system in rotation. Neutral sections in front of sectioning
and paralleling post (SP) shall be provided on the 25 kV OHE for segregating the
different phases. In between the TSS and SP, sub-sectioning posts (SSP) are provided
for sectionalizing and fault localization. The purchaser shall enclose their detailed
general supply diagram for the detailed understanding of the tenderer. 5.1.3. On other sections the adjacent TSSs are fed from the grid on the same phase and shall
feed the OHE in parallel. In such an arrangement, at SPs, bridging circuit breakers
shall normally be kept closed. In the event of a fault, the fault would be simultaneously
fed from adjacent TSS, which are in parallel operation. Refer Annexure 6 for details. 5.1.4. The supply to the OHE can be switched ON/OFF through circuit breakers which can
open or close automatically on fault. The circuit breaker provided at the TSS, SSP, SP
can clear the fault in their sub-sector. The other CBs of the adjacent sub-sectors shall
not trip normally in case of such faults. 5.1.5. Normally power supply from a TSS extends up to the SP on either side of the
substation. But in case of an emergency necessitating total shut down of the substation,
power supply from adjacent TSS on either side of the failed substation can be extended
up to the failed substation by closing the bridging CB of the 2 SPs. Also, under certain
emergency conditions the supply can also be extended beyond the failed TSS up to
the next SP. 5.1.6. The sectioning posts may be provided with conventional overlap type, PTFE type or
any suitable type including automatic switched neutral sections Auto Phase Switching
Section (APSS). Neutral section at the SP between the TSSs proposed to be operated
in parallel shall be of such type to facilitate parallel operation and without tripping /
closing of the loco/EMU circuit breakers during its negotiation.
5.2. Nature of traction load and faults on the system.
5.2.1. The traction load is frequently and rapidly varying between no load and overload. The
TSS equipment is subject to a number of earth faults/short circuits. 5.2.2. The AC electric rolling stock/ AC-DC electric locos / EMUs are fitted with, for
conversion of AC to DC, single phase bridge-connected silicon rectifiers with
smoothing reactor for feeding the dc traction motors. The rectifiers introduce harmonic
currents on the 25 kV Power supply. Also, there are EMU’s / locomotives with GTO
Pulse width modulation devices, in place of silicon rectifiers. Typical percentages of
the current harmonics present in the traction current with electric rolling stock are as
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follows:
TABLE NUMBER - 1: Harmonic currents Generated by IR Locomotives / 3 phase EMU’s
S. Harmonic order With Diode Three Phase EMU’s with
No Rectifier GTO’s*/ IGBTs.
1. 3rd harmonic (150 Hz) 15% The maximum harmonic current
of the individual harmonics at no time shall exceed 0.5 Amps
except for 3rd harmonic which shall have maximum value of 5
Amp.
3. 7th harmonic (350 Hz) 4%
4. 9th harmonic (450 Hz) -
5. 11th harmonic (550 Hz) -
THD’s 16.64%
*The GTO type of EMU’s / locomotives produce substantial 2nd harmonic currents which may go up to 10 % of fundamental current at times.
The average power factor of an electric locomotive and electric multiple units
generally varies between 0.7 lagging to unity.
5.2.3. The EMUs rakes are generally formed of 9, 12 and 15 coaches. One three coach unit
can take starting currents of up to 70 amps on 25 kV side. Under normal running
condition such a 3-car rake draws 40 amps. Such rakes are also capable of producing
regeneration current up to 40 Amps per unit of 3 coaches. 5.2.4. In case of locomotive hauled trains, a 3-phase electrical locomotive, at full power,
draws up to 270 amps of current from the OHE; the current produced during
regenerative braking is of the order of 150 amps. Normally one such locomotive hauls
one train but if gradients are high and loads are more a maximum of 2 locomotives in
multiple operation may be employed. 5.2.5. The number of faults/short circuits, per TSS, in the conventional 25 kV AC system
vary between 10 to 25 per month. 5.2.6. Generally, magnitude of fault current may vary between 40% and 100% of the dead
short circuit value. However, at times the fault current may be much less in case of high
impedance faults; bird faults or bond open earth faults shall fall under the category of
high impedance earth faults of the order of around 200 Amps fault current. 5.3. Short circuit apparent power of the system
The normal short- circuit apparent power for various system voltages for primary
side of traction transformer is as under: - TABLE NUMBER - 2: Short Circuit Level
Highest system Short circuit
voltage kV apparent power MVA
24 1000
72.5 3500
123 6000
145 10000
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245 20000
Fault levels at 110 kV grid sub stations of M/s Tata Power Co, at the respective 110 kV
buses are indicated as follow.
TABLE NUMBER- 3 Fault level at the GSS of M/s Tata Power Co.
Grid Substation Three Phase Fault Single Phase Fault
A fault on the incoming bus bar of power supply authority can be fed for a period of 500
ms. before the protective trippings take place. 5.4. Power supplies at traction substation
The following power supplies are available at a traction substation. i.) 110 V (+15 % & -30 %) dc from a battery.
ii.) 240V+20% A.C 50 Hz + 5% single phase from a 22/0.24 kV auxiliary transformer.
5.5. OHE impedance
Configuration of OHE in Mumbai are combination of contact wire of size 193 mm2 / 107 mm2 and catenary wire of size 240 mm2 / 322 & 129 mm2 (twin) / 65 mm2. Tenderer shall carry out measurements of the OHE impedance in association with purchaser for the
correct setting and operation of the relays within its designed accuracy. The measurement of impedance (R and X values) shall be done by injecting current of order of 800 A in each OHE in each sub-sector i.e. TSS to SSP, SSP to SSP and SSP to SP using suitable
50 Hz, AC voltage source. The likely range of voltage source may be from 100 to 800 Volts. This shall be demonstrated and verified by correct operation during commissioning and proving tests in the field.
The existing OHE may be replaced by conventional OHE gradually in a phased
manner. 5.6. Booster Transformers
In order to reduce inductive interference on the nearby telecommunication circuits,
booster transformers on certain sections of electrified track are installed in series with the
25 kV traction overhead equipment. The primary winding of the booster transformer is
connected to the 25 kV overhead equipment and the secondary winding is in series with a
return conductor (RC) which is strung close to the 25 kV overhead equipment. Booster
transformers of 150 or 100 kVA rating force the traction return current from the rail/earth
to flow through the return conductor. The Booster transformers have leakage impedance
of about 0.15 ohm each and are spaced about 2.67 kms intervals. The BTs may be installed
in a complete sub-sector or in part of a sub-sector.
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5.7. Connection of mast to traction rail and traction return
The track circuiting being provided in AC sections of Mumbai area shall be of 2 types.
(a) DC track circuiting (DCTC)
(b) Audio Frequency track circuiting (AFTC)
DCTC is the conventional track circuiting generally available in all conventional
system where the traction transformer neutral point is connected to one or both the traction
rails near the TSS. The masts are connected to the traction rail and on the track circuit
portion only one rail is available for traction returns and in the non-track circuit regions
both rails are available for the purpose of traction return currents.
In AFTC type of track circuit Audio Frequencies in the range of 1500 Hz to 10000
Hz are used. The traction return current is ensured as per ACTM provisions and existing
practice on Western Railway. Traction mast shall be connected to the designated traction
rail.
The Masts in both the cases shall be connected to the traction rail as per the guidelines
prevailing / issued for DCTC/AFTC. 5.8. Traction Power Transformer
The primaries of the single-phase traction transformers shall be of 220 kV or 132 or 110 kV
and the secondary voltage of 27 kV. Transformers of 21.6 MVA will be with 11 to 13 %
impedance and / or of 30 MVA with 15 to 17% impedance. The 30 MVA transformers shall
be provided with on load tap changer with taps to take care the input voltage variation and
maintain the no load voltage of 27 kV on secondary side. On load tap changer can be operated
from local and remote through SCADA. At one TSS, transformers of either 21.6 MVA or 30
MVA ratings are provided. Traction transformers of two or three adjacent TSSs may be
effectively operated in parallel when the incoming HV supply shall be from same phases and
the SPs are bridged, as described in clause 1.1.
The traction transformers shall be designed to carry short time overloads as the
traction loads may exceed the rating for short periods.
TABLE NUMBER - 6: Rating of the power transformer
Short time duration Rated secondary current of the Transformer
21.6 MVA 30MVA
Continuous 800 1111
15 Min 1200 1667
5 Min 1600 2222
5.9. Current rating of the OHE.
The Current rating of the OHE is generally as follows. The tenderer shall use these
values for considering suitable relay and advice to the purchaser on the setting of the
relays.
TABLE NUMBER - 7: Current handling capabilities of the OHE Type of conductor Current handling limits of
the conductor (Amps)
Continuous 15 Minute
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65 mm2 Catenary 212 265
240 mm2 Catenary 789 986
322 & 129 mm2 Catenaries, together 1471 1839
107 mm2 Contact 416 520
193 mm2 Contact 629 787
OHE with 65 mm2 catenary and 107mm2 Contact 628 785
OHE with 240 mm2 catenary and 193 mm2 Contact 1536 1920 OHE with 322 mm2 & 129 mm2 catenary & 193 2221 2777
mm2 contact wire
6. SERVICE CONDITIONS
6.1. The control panels shall be designed for use in arid and also in humid tropical climate with
adverse atmospheric conditions as indicated below, and installed in track side installations:
TABLE NUMBER – 8: Service Conditions
1. Max. ambient temperature. 55°C
2. Min. ambient temperature 0 ° C
3. Max. temp attainable by an object exposed to Sun 70° C
4. Max. & Minimum relative humidity 100% & 22%
5. Max. (Basic) wind pressure 150 kg/m2
6. Elevation above the mean sea level max. 1000 m above MSL
7. Average annual rainfall 1750 to 6250 mm.
8. Number of thunderstorm days per annum. 85 days.
9. No. of rainy days per annum 120 days (Max.)
10. Max no of dust storm days/annum 35 days
11. Vibrations Max: 350 microns
Average: 30 – 150 microns
Time duration: rapidly varying time duration 15 – 70 ms..
12. Seismic data Zone Zone-III
Coefficient of Seismic 0.04
acceleration
Importance factor (I) 2.5 for electrical
Equipment & 1.5 for others
13. Pollution level Very heavy, as in IEC 815-1986 & IS 13134-1992
6.2. The control and relay panel shall be installed at the traction substations, SSPs & SPs which
are normally unattended. The panels are situated close to the Railway tracks and hence the
Panels are subjected to vibrations due to running trains. 7. DESIGN FEATURES
7.1 Constructional Features
7.1.1. The C&R panel shall have modular construction to facilitate expansion and
replacement of the C&R panel components. The relays used for protection of HV
bus bars, traction transformers, OHE feeder and 25 kV capacitor banks (optional)
shall be numeric-processor type with modular construction.
7.1.2. According to clause 1.3, the Testing Jack/ Test Switch shall be
available in the Control & Relay Panel. The relay shall take care of the
“Testing Jack” provided in the Control & Relay Panel for testing the
relay with the help of testing kit connected through Testing Jack
without removing the relay from the panel and without disconnecting
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the connection of CT, PT etc. manually. The communication port shall
be available in testing jack for connecting the relay test kit. The relay
should be compatible with the testing jack / Test Switch provided in
the panel. This aspect should be considered in designing the relay back
panel so that all the available necessary interfaces are meeting the
requirement of Testing Jack without compromising the safety while
testing through latest Relay Test Kit.
There shall be numeric relay for HV bus bar protection. Transformer protection
shall include following protective relays. a) Numeric type transformer differential protection
b) IDMT over current relay for primary as well as for secondary side. The IDMT
relay on HV side with an instantaneous over current element.
c) Instantaneous earth leakage relay on primary as well as secondary side.
d) High speed inter-tripping relay.
e) Auxiliary relays for transformer faults i.e. Buchholz, excessive winding and oil
temperature trip and alarm.
f) Reverse power flow relay.
g) All relay shall be draw out type.
At least two relays shall comprise of above transformer protections.
Protection of HV incoming lines shall be supplied by the concerned supply
authority in a separate panel giving all the necessary control, indication and alarm contacts
on the terminal junction inside the panel. However, HV bus bar protection and the
connections from the protection panel of supply authority to the C&R panel for Railways
portion is under scope of this tender. C& R panel shall include the control of all HV
breakers including incoming breaker, bus coupling breaker and transformer breakers. All CT and PT termination shall be provided to the HV line protection panel of
supply authority installed in the Railway traction substation. Separate 110 V DC and 240
V single phase AC supply shall be extended to the HV line protection panel of supply
authority with appropriate rating of MCB.
The distance, WPC, OCR and Delta-I relays used for 25 kV feeder protection shall
be of numeric type. The auto reclose scheme for 25 kV feeder circuit shall be realized
using intelligent logic-based relay of suitable design.
In case of current operated relays facility shall be provided for automatic shorting
of CT terminals when the relays are withdrawn from the respective cases. All the relays
shall have flashing LED flags with external reset facility. Contact multiplication for
telesignalling to RCC shall be provided wherever required.
Note: - The tenderer is advised to refer Annexure –5 “Material Schedule”
7.1.3. The protection relays shall have facility to record 50 cycles of fault wave form (5
pre fault and 45 post fault both for current as well as the voltage). At a time minimum
8 such wave forms for voltage and currents shall be storable and shall be retrieved
through RS 232 serial connection port through a note book lap top computer and or
suitable external printer. Such waveforms shall also be retrievable at RCC through
SCADA. Suitable software shall be available to interpret the fault waveform data by
the tenderer. The software shall be capable of analyzing the peak, RMS and average
values of voltages and currents, D.C. component of currents, harmonic analysis and
determination of R, X, Z, and φ of the fault voltage, current waveform. The accuracy
of measurements shall be 1ms for time, 0.1 KV for voltages and 0.1 KA for currents.
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7.1.4. The relay shall be equipped with a serial communication port so as to provide a
means of access to the relay menu structure from a remote terminal. The tenderer
shall supply the support software for the relay, which shall be used for
communicating with the relay and shall allow fault record retrieval, settings/setting
groups to be viewed and changed.
7.1.5. The protective relay shall be immune to all even and odd harmonic currents. They
shall be tuned for the fundamental frequency or shall work on the principle of
fundamental waveform extraction. The relay shall be immune to electrical / electro-
magnetic interference.
7.1.6. The relay shall provide date and time stamping up to 1 ms. level for each fault. Relay
shall have facility for clock synchronization through SCADA or any other similar
synchronization facility.
7.1.7. A relay operation counter shall also be provided for each relay with resetting facility. This shall have facility to put date and time stamp for each tripping. Provision
shall be made to store the tripping information in a serial order with a separate data
logger. This data shall be retrievable through an external PC.
7.1.8. Suitable transducers or IED shall be employed for converting signals of the CT/PT
to desired levels for analog to digital conversion. The status of switchgears,
occurrences of alarm events shall be continuously monitored/ scanned by the
concerned relays.
7.1.9. The protection relays shall be compact in nature. There shall be separate protection
relays for HV bus bar protection, transformer protection, OHE feeder protection and
capacitor bank protection (optional). Suitable contact multiplication shall be done as
far as possible through software. For this purpose, only one set of NO/NC auxiliary
contact from each switchgear shall be terminated on C&R panel terminal block.
7.1.10. As the NO/NC signals from the switchgear are used for one of the functions
namely alarm, relay operation or in internal logic for interlocking, the burden in
some case may be more than what could be met by simple software multiplication.
Interposing relays may therefore be used at such places. The overall design however,
shall be such as to minimize the wiring.
7.1.11. In case of the feeder protection relay adequate redundancy shall be provided in
various elements to ensure that the protection is not disabled and in emergency cases
of mal-functioning of a protection unit/ relay, associated circuit breaker is
automatically tripped along with corresponding telesignal of the alarm regarding
mal-functioning of the protection element. The design shall be failsafe.
7.1.12. The feeder protection relays shall have self-diagnostic feature. Displays for
confirming the relay healthiness or defects shall be displayed with alarms for speedy
trouble shooting by the operator.
7.1.13. The system shall have provision for extension to accommodate the protection
for capacitor banks, in addition of OHE circuit breakers of additional lines to cover
the future requirements up to 6 tracks normally.
7.1.14. C& R panel are to be of IP 52 to avoid ingress of vermin, insects, rats and dust
and suitable for use in tropical humid climate. Protection relays are to be of IP-42
class.
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7.1.15. Each feeder protection relay shall have backlit LCD display of appropriate size
LCD characters for display of relay status, settings etc. Bright LEDs shall be used
for display of power ON conditions and trip indications of the relays. The parameters
of the relay shall be settable through a membrane keypad.
7.1.16. As the traction sub-stations are normally unattended, so there shall be a
provision for power down mode for the system when the substation is not being
manned. In this case all the protection elements shall function as usual but the alarm,
annunciation/display and local acknowledgement features will remain out of circuit
till the system is activated again.
7.1.17. All the protection relays, D.C. and A.C. supply, equipment in yard, annunciator
windows and other peripheral equipment, measuring instruments required for the
control panel shall be hard wired to form a control and relay panel. For all the
external connections there shall be terminal blocks for terminating the connections. 7.1.18. The panel shall be of the vertical self-supporting closed type steel construction,
low voltage, back to back duplex corridor type with central roofed in access. The
central access corridor shall be provided with lockable doors at either end. The
control board shall be fabricated from sheet steel of thickness not less than 3.25 mm
(10 SWG) for front and rear panels, base frame, door frame, vermin proof fitments
and not less than 2 (14 SWG) for side panels, roof and doors. The bottom portion of
the panel shall be provided with detachable type sheet steel covers (over trench
portion) with suitable cable glands to facilitate entries of control cable from trenches
to control board, the bottom of central access corridor shall be provided with
removable wooden planks of hard wood of adequate thickness to facilitate free
movement of working staff. The panel shall be suitable for erection flush with the
concrete floor by evenly spaced grouting bolts projecting through the base channels
of its frame. The panel shall be made in suitable sections to facilitate easy transport,
handling and assembly at site.
7.1.19. All control and supply cables shall be laid in a distribution trench running under
the control panel. The cables shall enter the board from the trench through suitable
glands. Detailed dimensions of the trench work required will be furnished. Provision
shall be made to seal the points of entry of cables to prevent access of rats, insects
and lizards into the board.
7.1.20. The sheet steel as well as other steel works shall be properly treated and then an
undercoat suitable to serve as base and binder for the finishing coat applied. The
exterior and interior surface and the base frame of the panels shall be epoxy powder
coated in a shade to be mutually decided later by manufacturer and purchaser.
If any painted surface gets damaged during transit the surface finish shall be
restored at site after erection.
7.2 Termination for the purpose of interfacing of C&R panel with SCADA.
7.2.1 Suitable termination for measurands and telesignalling, CT (with shifting link), PT and
AT output for each CT, PT and AT shall be provided in C&R panel.
7.2.2 One set of NO/NC auxiliary contacts for each relay/indicator, CB, interrupter and motor
operated isolator shall be suitably wired up and terminated in the C&R panels at TSS
for the purpose of telesignalling and issue telecommands for the SCADA.
7.2.3 One set of NO/NC contacts for telesignalling failure condition to be transmitted
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/reported to SCADA shall be suitably wired up and terminated in C&R panel with
identification level at terminals as described in Clause 5.4.4, 5.5.1, 5.6.1, 10.0.
7.2.4 One set of NO/NC auxiliary contacts for telesignalling and to reset each relay after relay
has been operated, shall be wired up and terminated in C&R panel.
7.2.5 One set of NO/NC contacts for telesignalling auto reclosure locked out in first cycle
and in second cycle and contacts for issue of telecommand for release of locked out. 7.2.6 Over and above, a provision of 30 % spare NO/NC contacts shall be made in the C &
R panel wiring which shall be decided at the time of finalization of C & R panel
drawings.
7.2.7 The C&R panel shall have option for setting of relays & retrieving status locally.
Appropriate interface equipments shall be provided for exchange of information
through SCADA for retrieving the status of relay, waveforms and changing the relay
settings by remote through SCADA. 7.3 Control Panel
7.3.1 The scheme of connections at the TSS, SSP and SP showing the circuit breakers,
transformers, isolators and interrupters shall be represented by a single line mimic
diagram on the control panel. The colour of the bus bar shall be signal red to shade 537
of IS:5 for 220/132/100kV/22KV, golden yellow to shade 356 of IS:5 for 25 kV and
black for 240V. The mimic diagram shall be spray painted on the panel with the width
of mimic strip of 8 mm. The successful tenderer shall get his designs for layout of
equipment and wiring of the control panel approved by RDSO. 7.3.2 Suitable spring-loaded push-button switches shall be on the control panels in
conjunction with red and green indication LED’s for control and indication of circuit
breakers and interrupters. Automatic semaphore relays shall also be incorporated in the
mimic diagram to indicate the position of circuit breakers and interrupters. The
semaphore relay shall have the feature of disc coming to the neutral position in the event
of failure of supply. 7.3.3 A local/remote change-over switch shall be provided for each remote-controlled
apparatus viz. circuit breaker/interrupter for changing over the control from local to
remote and vice versa. The auto-trip circuit operated by the protective relays shall,
however, trip the circuit breakers directly irrespective of the position of the change-over
switch. 7.3.4 Back lit or bright segmented LED type digital ammeters and voltmeter shall be provided
for measuring currents and voltages through the CT, PT’s. The accuracy of the
displayed parameter shall be 1 Amp and voltage up to 500 Volts. Suitable optocouplers
and transient surge suppression / limiter circuits shall be provided to avoid damages to
the digital measuring circuits. The meters shall be provided for measuring the
following.
i. HV side voltage and current for each of two incoming lines at TSS.
ii. Voltage and total load current on 25 kV side each of the two transformers at
TSS.
iii. Power factor meter at 25 kV side of each transformer
iv. Current of each feeder at TSS
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v. Voltage at 25 kV bus of SSP
vi. Voltage at 25 kV buses of either side of bridging CB at SP
vii. Current through bridging CB at SP.
7.3.5 The position of 220 or 132 or 110 kV and 25 kV isolators shall be represented on the
mimic diagram by manually operated semaphore switches. The size of the panel shall
be large enough to facilitate ease of maintenance. The inside of the panel shall be
properly illuminated and provided with roof mounted fan to facilitate ease of
maintenance. Suitable plug points of 240 V AC for connecting maintenance equipment,
test equipment and hand lamps shall be provided inside the C&R panel. The C&R panel
may be either duplex or simplex type with sizes 1100x1900x2300 mm or
1100x600x2300 mm. Sizes of the panels are only indicative. The actual size and
quantities shall be decided at the time of drawing approval. 7.3.6 Facility shall also be provided on all control panels to verify the availability of 110 V
dc supply and continuity of trip circuit for each breaker separately by means of push
buttons alongside the control switches and yellow indication LEDs.
7.4 Annunciation
7.4.1 The annunciator shall be provided as a digital LED/LCD type of displays with date and
time stamps. Electronic digital sound type alarms of selectable sound shall be provided
for the purpose of warning to any staff who may be available locally where an incidence
occurs. The LED/LCD shall be of sufficient size and shall be provided at eye level to
permit the operator to see and read the occurrence of the incidence clearly. The alarm
shall be loud enough be heard from a distance of 20 meters.
7.4.2 Red LEDs shall be provided on the control panel for giving individual visual and audible
alarm whenever any of the protective devices or other relays operates. The visual alarm
shall be of flasher type which continue to flicker and become stable till, the alarm is
accepted. The annunciation LEDs shall be provided on the control panel at the top in
suitable number of rows and concerned transformer/circuit-breaker/PT etc. symbol on
the mimic diagram, as approved by the purchaser. The alarm accepting, visual resetting
and annunciation testing buttons shall be mounted on the control panel at a convenient
place & height. The alarm bell shall be mounted inside the control board.
7.4.3 The tenderer shall clearly specify in his offer detailed technical description of the
annunciator clearly bringing out the type of annunciator being provided by him with
detailed technical description of the annunciator.
7.4.4 Annunciation shall be arranged for the following fault conditions as are applicable for
each circuit. There shall be 30 % spare windows available at the annunciator window to
cater for future provisions.
Type I control panel
a) HV breaker trip at the supply authority end ( for each circuit) b) Incoming HV breaker trip at railway TSS ( for each circuit)
c) Primary transformer breaker trip (for each transformer CB)
d) 25 kV transformer breaker trip (for each transformer CB)
e) 25 kV feeder breaker trip (for each Feeder CB) f) Transformer Buchholz trip (for each transformer)
g) Transformer oil temperature trip (for each transformer)
h) Transformer winding temperature trip (for each transformer)
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i) Transformer pressure relief device trip (for each transformer)
j) Tap changer pressure relief device trip (for each transformer)
o) Communication circuit failed. (If communication-based relay is provided)
p) Panto-flashover relay bypassed.
q) High fault current auto-recloser bypassed.
r) Main feeder CB stuck (for each feeder CB).
s) Tri circuit of CB healthy
t) 110 V DC fail supervision
u) Low air/gas pressure alarm for each CB
v) Trip and lock out on low air/gas pressure for each CB
Type II Control Panel
a) 25 kV line breaker trip for each CB b) 25 kV line PT fuse fail.
c) Communication circuit failed. (If communication-based relay is provided)
d) Panto-flashover relay bypassed.
e) High fault current auto recloser bypassed. f) Main feeder CB stuck.
g) 25 kV bridging CB trip.
h) 25 kV bridging CB close.
i) Trip circuit of CB healthy
j) 110 V DC fail supervision
k) Low air/gas pressure alarm for each CB
l) Trip and lock out on low air/gas pressure for each CB
Type III Control Panel
a) 25 kV line breaker trip for each CB b) 25 kV line PT fuse fail.
c) Communication circuit failed. (If communication-based relay is provided)
d) Panto-flashover relay bypassed.
e) High fault current auto recloser bypassed.
f) Main feeder CB stuck.
g) Trip circuit of CB healthy
h) 110 V DC fail supervision
i) Low air/gas pressure alarm for each CB
j) Trip and lock out on low air/gas pressure for each CB
Type IV Control Panel
This shall be tailor made as per the specific requirement of the purchaser. The
annunciation to be brought out shall be discussed and decided mutually between the
purchaser and the tenderer.
7.4.5 For monitoring the OHE supply or 240 V supply, suitable relays operated off the OHE
PT or 240 V supply respectively shall be provided in the control panel by the successful
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tenderer. A push - button, in series with each of these supply monitoring circuits, shall
be provided by the side of the corresponding supply fail indication LED to test the
healthiness of the monitoring and annunciation circuit.
7.4.6 A hooter or high audio level alarm for detecting the low D.C. or High D.C. voltages shall
be provided. The alarm shall sound in case the D.C. control voltage goes beyond the
limits as specified in this specification. (High or low)
7.5 DC supply supervision and annunciation
7.5.1 A provision shall be made for annunciation and supervision of 110 V d.c. supply to
various control and alarm and indication circuits. 110 V d.c. supply to control and relay
panel is normally made available from 110V battery chargers/batteries through
distribution panel provided in the control room, in six separate circuits as under:
Type – I Control panel
a) Control circuit for HV incoming line and bus coupling breaker. b) Control circuit for H.V. and L.V. breakers of traction transformer - 1.
c) Control circuit for H.V and L.V. breakers of traction transformer - 2.
d) Control circuit for 25 kV feeder breakers.(One control circuit for two track)
e) A common circuit for alarm and indication purposes.
f) D.C. control voltage from battery low.
Type – II & III Control panel
a) Control circuit for 25 kV feeder breakers. b) A common circuit for alarm and indication purposes.
c) D.C. control voltage from battery low.
Type – IV Control panel
(The design & specification for this type of control panels shall be as mutually
agreed to between the Purchaser and the tenderer) 7.5.2 Provision for supervision of d.c. supply to each of the above circuits shall be ensured.
On failure of d.c. supply to any circuit, a yellow LED (provided individually for each
of the circuits) and horn / siren / electronic sound, operating both from 240 V A.C.
single phase supply and separate battery supply (tenderer’s scope) shall come up.
The side of the corresponding D.C. fail indication LED shall provide a push
button, in series with each supervision circuit, in order to test the healthiness of the
supervision and annunciation circuit. In addition, a common miniature type push button
for the cancellation of horn shall also be provided. 7.5.3 The control/common circuits mentioned in Clause-5.5.1 above, being common for all
the panels, are segregated suitably at the control panel for each panel through links etc.
so that D.C. supply is available to other panels when any one is taken out of service for
maintenance purpose.
7.5.4 Low control voltage alarm
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A definite time under voltage relay shall be provided to detect the dropping of the
D.C. control voltage below the level as specified in this specification. Alarm / Hooter shall
be sounded if the low voltage condition persists for more than 10 sec.
7.6 Trip circuit supervision
7.6.1 The continuity and the availability of DC supply to the trip circuit of each circuit breaker
shall be monitored independently by an auxiliary relay connected in series with the trip
coil of the breaker. The current taken by the auxiliary relay shall not exceed 10 mA.
Whenever the auxiliary relay de-energizes (while the breaker is in the closed position)
either due to discontinuity in the trip circuit or d.c. supply failure, a yellow LED
(provided individually to the trip circuit of each breaker) and horn, both operated off 240
V, single phase supply, shall come up. The side of the corresponding trip -circuit fail
indication LED to test the healthiness of the supervision and annunciation circuit shall
provide a push button, in series with each of these auxiliary relays. 7.6.2 Since the substation is un-attended, necessary cut-off switches shall be provided on each
control panel for disconnection of the audio-visual alarm and annunciation and indication
circuits to avoid un-necessary drainage of the battery.
7.7 Indication LED’s 7.7.1 Low consumption, extra bright, 5 mm dia, light emitting diodes (LEDs) shall be used
wherever required. The LEDs shall be suitably wired to glow off at 110 V d.c. supply.
LEDs shall be housed in suitable metallic holders with glazed/polished surface to act as
reflector. The holders shall be screwed to the panel from inside.
7.7.2 The following colour scheme shall be adopted for indication LED’s.
TABLE NUMBER – 10 Colour scheme for wiring
S.No Signal for Colour of light
1. Circuit breaker closed Red
2. Circuit breaker open Green
3. Trip circuit healthy *Yellow
4. Circuit Breaker auto trip *Amber
5. 110 V D.C. fail supervision *Amber
6. Line potential *Red
7. Blower fan working *Blue
* These LED’s shall normally remain extinguished and shall light on occurrence of the alarm / fault.
7.8 Test terminal blocks
7.8.1 Suitable test blocks shall be mounted conveniently inside the control panel so as to be
easily accessible. The current rating of the contact shall be 10 A continuous and 150 A
for at least one second at 240 V a.c. or 110 V d.c. The current terminals shall be provided
with short circuiting links or other suitable devices:
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a) To short circuit the current transformer leads before interrupting the normal circuit
for injection from external source for testing (applicable for secondary injection
tests of relays).
b) To complete the current transformer circuit through a testing instrument in which
case the testing instrument shall be connected to the current terminals and the
intermediate link opened out (applicable for checking indicating instruments with
sub-standard meters at site). 7.8.2 The potential testing terminals shall be preferably housed in narrow recesses of the
moulded insulation block to prevent accidental short circuits. The arrangement of the
terminals shall be made such that either portable type energy and maximum demand
meters, or tri-vector meters with printo-maxigraph for recording kW, kVA and kVAR
can be connected when required.
7.8.3 Vertical or horizontal pillar stack type terminal blocks suitable for 1100 V service and
not less than 30 A rating shall be provided for terminating outgoing ends of control panel
wiring and the corresponding incoming tail ends of the control cables. Provision shall be
made on each pillar for holding 20% extra connections. The terminal blocks have
individual identification markings which shall be either engraved or made indelible by
any other means. Pillars of terminal blocks meant for connections of incoming control
and indication cables shall be specially provided with identification labels indicating
function(s) of each terminal block. 7.8.4 The terminals on the terminal blocks shall be of stud type suitable for terminating the
ends of control wiring and outgoing cable ends through crimped terminal spade/lugs,
which shall be securely tightened with nuts and spring washers. Suitable shrouds of
unbreakable transparent material shall also be provided on each terminal block. 7.8.5 Terminal blocks connected to potential circuits and current circuits shall not be placed
adjacent to each other in a pillar. Where such segregation is not convenient due to any
reason, a dummy spacer of insulating material of adequate thickness or a space terminal
block shall be provided in between two such circuits. 7.9 Wiring of the C&R Panel
7.9.1 All panel wiring shall be done with switch board type 1100 V grade PVC insulated single
core, tinned annealed stranded copper conductors for service in extremely tropical
climate. The PVC wires shall conform to latest version/revision of IS:694 and duly tested
for flammability test as per IS:10810 (Part 53)-1984. The wiring shall also not be prone
to attack by vermin, i.e. mice, white ants, cockroaches etc. 7.9.2 The size of wires in the meter and relay circuits connected to the current transformers
shall not be less than 4 mm2 copper and in potential and other circuits not less than 2.5
mm2 copper. The wires shall be stranded, composed of strands of not less than 0.91 mm
(20 SWG). 7.9.3 The numbering and scheme of wiring for various circuits in the control and relay panel
shall be in accordance with latest version of IS: 375. The following colour scheme shall
be adopted for the wiring in order to facilitate identification of circuits:
TABLE NUMBER – 11 Colour schemes for wiring
S.No Circuit Colour of wire
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1. 220 or 132 or 110 kV current Blue
transformer circuit.
2. 220 or 132 or 110 kV PT circuit. White
3. 25 kV potential transformer circuit Yellow
4. 25 kV current transformer circuit. Violet 5. 240 V A.C. auxiliary phase Red
neutral Black
6. DC control circuits Grey
7. Earth circuit Green
PVC sleeves of colours, red for trip circuit, blue for indication circuit, yellow for
alarm circuit, green for relay and other inter connections to be provided. 7.9.4 A suitable plaque of durable material and description giving the colour scheme of wiring
shall be provided inside the control board to facilitate quick identification of circuits for
maintenance purpose. 7.9.5 All potential bus wiring, D.C control supply bus wiring and other such other wiring
which runs from panel to panel within the control panel shall be suitable supported and
clipped to the frame work. The wiring for interconnection between control and relay
panels shall be fixed under the roof of the corridor. All wiring shall be neatly bunched
with PVC tape or laced by thread.
7.9.6 Where a bunch of wire is clamped by metal clips, the wires shall be taped together by
one or two layers of PVC tape to protect them against mechanical injury. Wiring
connected to the space heaters in the panels shall be provided with porcelain beaded
insulation for a short distance from the heater terminals and heat resistant bushes of
insulating materials shall be provided at the terminal housing outlets. No joints shall be
permitted in the wiring.
7.9.7 The terminal ends of all wires shall be provided with numbered interlock type ferrules,
which are of PVC, or other durable material with marking either engraved or punched
so as to be indelible. The ferrules shall be of white colour with black lettering thereon.
However, for trip circuits ferrules of red colour shall be used. At a point of inter-section
where a change of number is necessary, duplicate ferrules shall be provided and marked
with proper numbers.
7.9.8 Ends of all wires shall be provided with terminal spades (tinned) which shall be crimped
to the wires. At terminal connections, washers shall be interposed between wire
terminals and holding nuts. The connection studs project at least 3 mm from the lock-
nut surface. Wire ends so connected at the terminal studs that no terminal ferrule gets
masked due to the succeeding connections. The wire ends shall be suitably bent to meet
the terminal stud at right angles with the stud axis; skew connections shall not be
permitted. 7.10 Fuses and Links
7.10.1 HRC fuses of adequate current rating shall be provided in all potential circuits. Fuse
bases and carriers shall be mounted in the interior of the control board and at easily
accessible places. The fuse rating and the identification number, as assigned in the
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schematic diagram shall be indicated on the fuse carriers. Suitable labels with engraved
markings indicating the rating, identification number and the circuit in which used, shall
also be provided below the fuse bases. 7.10.2 The links provided in the circuits either on negative/neutral side or for branching
purposes, shall also be similar to fuses mentioned above, except that these shall be
provided with tinned copper strip of suitable size in place of HRC fuse. The link
identification number as assigned in the schematic diagram shall be indicated on the
link carrier. The link base shall also be identified in the similar manner as the fuse base
mentioned in Clause 7.9.1. 7.11 Space Heaters & Control panel lighting
7.11.1 Suitable space heaters to operate off 240 V single-phase ac supply with `ON’ switches
shall be provided inside the control board to prevent condensation of moisture in humid
weather. 7.11.2 The interior of control panel enclosure shall be adequately lighted by incandescent
lamps/ florescent tube light connected to 240 V single phase ac supply. The central
corridor shall be illuminated by a lamp controlled by the door switches provided on the
doors on either side of the corridor. Each section of the control and relay panel shall
also be illuminated, controlled by separate switches. 7.11.3 Two sets, one each for relay panels and control panels, of 5 Amps, single phase, 3 pin
plug sockets with switches shall be provided inside the control board at convenient
points for use of portable lamps. 7.12 Earthing
7.12.1 All current free metallic bodies of equipment/ relays etc. on the control board shall be
earthed properly. Main earth circuit shall be of 25 x 3 mm tinned copper strip and
individual connections of equipment/relays with main earth circuit shall be by means of
2.64 mm (12 SWG) tinned annealed copper bare conductor/strips, using tinned copper
spade terminals/lugs. Some times as an alternate, PVC insulated stranded tinned copper
wire of size equivalent to 2.64 mm (12 SWG) shall also be provided. Joints shall be
avoided as far as possible.
7.12.2 In order to facilitate the earthing of secondaries of CTs and PTs inside the control
board, suitable earth links of adequate size made of tinned copper/brass shall be
provided inside the control board at the appropriate points. 7.12.3 Multiple earthing of current/potential transformer circuits shall be avoided. Main earth
connection for each panel shall be brought out to two terminals for connection to the
general earthing system. 7.13 Name plate and Identification labels
7.13.1 All relays, instruments and other electrical devices mounted on the board shall have
name plates with rating data, serial number and manufacturer’s name. 7.13.2 Identification labels of size 65 x 13 mm bearing identification marks indicating
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functions of respective equipments shall be provided on the exterior of control and relay
panels under all the relays, instruments and test blocks etc. Similar labels shall also be
provided under the switches where necessary. 7.13.3 Identification labels of size 25 x 25 mm bearing identification marks indicating
numbering of respective equipments shall be provided beside the semaphores, power
transformer and auxiliary transformer positions on control panels. The control and
local/remote selector toggle switches shall be provided with suitable labels duly inserted
in their pockets available for the purpose. The scheme of numbering of various
equipments in traction substations shall be supplied by the purchaser.
7.13.4 All push buttons on the control panel shall have suitable inscription on their collars
indicating the functions of each push button. Where such collars are not available,
separate indicating labels of PVC sheet of suitable width and length not more than the
overall outside dimensions of the push buttons shall be provided. Similarly, the function
of each indication and annunciation LED shall be indicated by a label of elegant design
and appropriate size shall also be provided alongside/along with the concerned LED
holders. The inscription shall clearly convey the function of each indication LED.
7.13.5 Plastic plates about 50 mm wide, bearing suitable captions to identify the transformer
bay and corresponding outgoing 25 kV feeder, shall be provided on the top of each relay
and control panel. 7.13.6 All the identification labels on the exterior of control and relay panels shall be secured
with the help of chromium plated metallic screws. 7.13.7 Identification labels shall also be provided in the interior of the control panel. For such
of the equipments and fittings, which are exclusively mounted inside the control panel,
the labels of suitable size indicating function of respective equipment shall be provided.
Whereas the labels inside the control board for the equipments mounted flush/semi-
flush outside the control and relay panels, bear reference index code corresponding to
the schematic diagrams.
7.13.8 The labels inside the panels shall be secured with the help of adhesive of good quality
(wherever necessary). The labels in the interior of the board under the equipments/relays
shall be so provided that they are not obscured due to bunches of wire runs and any
other obstructions. Painting of inscriptions shall not be permitted. 7.13.9 All inscriptions on the labels to be fixed on the control and relay panels shall be made
on the PVC sheet strip of black background with white engraved letters/figures.
However, the labels to be fixed inside the panels shall be either of engraved lettering or
of aluminium anodized screen-printed type. 7.13.10 The lettering for inscriptions on the labels shall be generally of the following sizes:
TABLE NUMBER –12 Label Sizes
S. Label description Size of label Height of
No. letters/figures
1. Main labels to be provided on the top 50 mm x length to 15 mm (two
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Panels. suit rows) 2. Circuit labels to be provided at the 13 mm x 65 mm 5 mm (single
bottom of the panels row)
3. Function label under the equipments 13 mm x 65 mm 4 mm 4. Push button and indication LED labels - 4 mm (single
row)
3mm(double
row)
5. Equipment numbering labels. 25mm x 25 mm 7 mm
6. Control & selector switch labels - 7 mm
7. Labels under fuses and links. 25mm x 25 mm 3 mm
8. Reference labels (Interior of panel) 25mm x 15 mm 5 mm
9. Terminal block pillar numbering labels 10mm x 15mm 5 mm
10. Terminal numbers on terminal blocks - 3 mm
11. Function inscriptions on terminal blocks - 3 mm
Note: - However, in case of space limitations, the manufacturer may adopt suitable label
dimensions without affecting the legibility and aesthetic appearance of the panel.
Any other label not covered above shall be of matching size. 8. SCHEME OF PROTECTION
The scheme of protection provided at each of the traction substations and SSP/SPs shall comprise of the following systems:
a) Incoming 220 or 132 or 110 kV HV line protection shall be under the scope of
supply authority. However, HV bus bar protection shall be covered under this
specification and shall be under scope of the tenderer. Refer clause no. 4.2 (i) and
7.1.1.
b) Protection of the 220 or 132 or 110 / 25 kV transformer installed at the traction
substation.
c) Protection of the 25 kV traction overhead equipment. d) Protection of capacitor bank equipment (if asked for by the purchaser in the
tender).
The relays to be provided shall have the following functional requirements.
i) They shall be immune to distorted power frequency waveforms caused by the
harmonics, phase shifts and transient faults.
ii) The relays shall be insensitive to power swings, permissible overload and
transient condition including magnetizing inrush current of locomotive
transformers and shall be suitably designed to compensate the effect of fault arc
resistance.
iii) All the relays except reverse power flow relay shall be immune to reverse power
flow in case of regenerative current going back into the grid.
iv) They shall of standard design and be fail safe in design. Any failure of the relay
shall either cause taking over of the functions of the relay by another relay or
cause it to fail in a manner so that the safety of the 25 kV distribution is not
affected.
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v) The relays with communication features shall have necessary interface
equipments and follow the standard communication protocol of IEC 60870-
5-103.
vi) The relays shall be suitable for operation from the 220 or 132 or 110 and 25 kV current transformer and potential transformer to the following particulars:
TABLE NUMBER -13 Ratings of CT and PT on 25 kV side
S.No Description CT* PT
1. Rated system voltage 25 kV rising up to 30 kV
2. Rated transformation 3000-1500/5A 25000/110V
ratio
3. No. of cores two two winding
4. Core-1 Core-2
5. Rated burden - - 100 VA
6. Accuracy class PS PS 0.2 as per IS: 3156 (part II)
& 3P as per IS: 3156 (part
III)-1992
* Two cores on 25 kV CTs are provided considering one core for differential
bus bar protection and other core for balance protection relays viz. DP relay,
OCR, WPC, Delta I etc.
TABLE NUMBER -14 Ratings of PT on 220 or 132 or 110 kV side
S.No Description PT
1 Rated system voltage 220 132 110
2 Highest system voltage 245 145 123
3 Rated transformation 220kV/110V 132kV/110 V 110 kV/110V
ratio
4 No. of windings Winding 1 Winding 2
5 Rated burden 100 VA 200 VA
6 Accuracy class 0.2 3P
TABLE NUMBER -15 Ratings of CT on 220 or 132 or 110 kV side
The following protection shall be provided for each circuit breaker–
i) Directional Numerical distance protection relay with 3 zones and
polygonal characteristics.
ii) Directional definite time over current relay
iii) High impedance type differential protection relay for bus bar
iv) Over current protection relay for bridging CB v) Under voltage protection relay for bridging CB vi) Panto flashover prevention & signalling relay (optional).
vii) Intelligent Logic based auto reclosures.
viii) PT fuse failure 8.3.4 Shunt Capacitor Bank Protection.
(Optional only if demanded specifically by the purchaser) The protection system for capacitor bank shall be as per the relevant RDSO
specifications of capacitor bank viz. ETI/PSI/67 (11/96) with A&C slip no. 1 to 7-
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for shunt capacitor bank or TI/SPC/PSI/THYCAP/0030- for thyristor switched
capacitor bank or any other latest RDSO specifications. 8.3.5 Synchro check relay
For the TSSs which shall be operated in parallel, synchro check relays shall be
provided on transformer LV side breakers at TSS and at bridging CBs at SP. The relay
contacts shall be provided in the closing circuit of these CBs to ensure proper
synchronisation between two sources. The relay shall have separate adjustable settings for
voltage magnitude (having range of 0-10% in steps of 0.5%) and phase angle (having
range of 0-50 in steps of 0.50). 9. DETAILS OF PROTECTION SCHEME FOR HV INCOMING LINES
9.1 Details of incoming HV line protection including following shall be provided by supply
authority.
1. Fibre optic line differential protection 2. Directional over current relay
3. LBBU relay (LBB- breaker failure relay)
4. Under voltage relay with time relay.
5. Over voltage relay with time relay.
9.2 Differential biased bus bar protections relay
9.2.1 Protection against bus faults shall be provided by means of a sensitive differential low
impedance type protection relay. The relay shall be of the high-speed type and operates
in less than 40 milli-seconds for 2 times the rated current and in less than 15 ms. at
currents of 10 times the set value. The following features shall be incorporated in the
relay. 9.2.2 The current setting of the relay shall be suitably adjustable in appropriate steps.
The % error in operating current shall not exceed + 5 %. 9.2.3 The relay shall have overload current handling capabilities up to 2 times the set current
permanently & 40 times the set current for one second. 9.2.4 The relay shall not operate for maximum through fault current. 9.2.5 Three number output trip contacts shall be provided on the relay to trip the desired CBs
simultaneously. 10. DETAILS OF PROTECTION SCHEME FOR 220/25kV, 132/25 kV, 100/25kV,
22/25 kV TRANSFORMER 10.1 Differential Protection
10.1.1 Protection against internal faults shall be provided by means of a sensitive single-pole
numerical differential protection relay. The relay shall be of the high-speed type and
operates in less than 40 milli-seconds for 2 times the rated differential setting current
and in less than 15 ms. at currents of 10 times the set value. The following features shall
be incorporated in the relay: 10.1.2 There shall be no necessity for changing the setting of the relay when the transformer
tap is changed. The traction power transformer is provided with taps from +10% to –
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15% in steps of 1.67% each. 10.1.3 The relay shall not operate for maximum through fault current. Necessary harmonic
restraining features shall be incorporated to prevent operation due to in-rush of
magnetization current when the transformer is charged either from the primary or the
secondary side. The relay shall have second harmonic magnetic inrush restraint feature
in order to prevent unwanted tripping. The relay shall be insensitive to inrush currents
up to 5 times the differential setting of the relay. Also, the relay shall be blocked for
operation in case second harmonics exceed a predetermined set limit. The limit of
blocking the relay shall be decided between the purchaser & tenderer after carrying out
measurements as in Clause 15.1. To start with, the relay shall be blocked for operation
in case 2nd harmonic current exceeds 15 % of the fundamental current. 10.1.4 The current setting of relay shall be adjustable preferably between the range of 20-50%
in suitable steps. Percentage error of operating current shall not exceed +/- 5%. 10.1.5 Adjustable bias setting shall also be provided. The bias at minimum operating current
setting shall be 15% to 50% in 6 steps for this relay to suit the tapping range of the
traction transformer and other design considerations. 10.1.6 The relay shall be connected to bushing type current transformers provided in the
bushings of 220/25 kV, 132/25 kV, 110/25 kV, 22/25 kV transformers. However, it
may be optional to connect the relay to the separate current transformers (PS class core)
provided on the HV & LV sides of transformers. This way bus bar, CB and other
equipments shall be covered under the differential protection. However, interposing
current transformers of suitable ratio and rating with matching characteristics of knee
point voltage, excitation current etc. are provided with the differential relay in order to
boost up the bushing CTs secondary current, at full load, to a value equal to relay rated
current. Magnetization and ratio error curves for the current transformers shall be
supplied by the purchaser to enable the tenderer to match the characteristics of the
relays and interposing CTs with those of the current transformers. The interposing CT
shall be within the scope of supply by the tenderer. The tenderer can also supply a
software based integral CT ration compensation instead of the conventional interposing
CT. 10.1.7 The relay shall have overload current handling capabilities up to 2 times the set current
permanently & 40 times the set current for one second. 10.2 Earth-Leakage protection.
Back-up protection for internal earth faults within the transformer shall be
provided by means of a sensitive, high speed, earth-leakage instantaneous relay of very
low pick up current. Such relays shall be provided separately on both the primary and
secondary sides of the transformer. Both on the primary and the secondary sides the
relays shall be connected to separately mounted current transformers. The current setting
for the relay shall be adjustable between 10% and 80% of 5 Amps in equal step at 5%.
The relay shall be of T 10 class with operating time not exceeding 20 ms. for currents of
5 times the relay settings. The relay may be operated on voltage principle with suitable
voltage setting based on fault current levels of transformers. 10.3 Over current protection
Protection against over-current in the transformer shall be provided by means of
single-pole, non-directional over-current relay with inverse definite minimum time lag
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(IDMT) characteristics both on the primary and the secondary sides of the transformer.
Further, an additional instantaneous over-current relay shall be provided on the primary
side. On the primary side the over-current relay shall be connected to separately mounted
current transformers.
On the 25 kV side the over-current relay shall be provided only on the live
(unearthed) leg of the power transformer through a separately mounted current
transformer. The over- current relay on the secondary side shall serve as back-up
protection against faults in the 25 kV overhead equipment and also against bus faults
etc. The over-current relays on the primary side shall serve as back up to the over-current
relay on the 25 kV side as well as back-up to differential and earth leakage relays against
heavy faults. Proper discrimination shall be maintained in the operation of these two sets
of over-current relays. The tenderer shall develop relay setting guidelines with
supporting calculations and submit to RDSO for scrutiny and approval. The setting on
these relays shall be adjustable as under:
TABLE NUMBER 16
Setting range of IDMT Relay
Sl. Item Current Setting Time Multiplier
No. setting
IDMT over-current on primary 80% to 320% as per IDMT 0.1 to 1
side. curve 3-sec at 10 Ir
Instantaneous over current on 400% to 1600% of IDMT -
primary side setting
IDMT over current on 80% to 320% as per IDMT 0.1 to 1
secondary side. curve 3-sec at 10 Ir
The instantaneous relays shall be of T 10 class with operating time not exceeding 20
milli-seconds at the set.
10.4 Inter-tripping Relay
The differential relay and earth leakage relay both on the primary and 25 kV sides
as also the over-current relays on primary side shall cause inter-tripping of the 220 or 132
or 110 kV and the 25 kV circuit breakers associated with the transformer. The inter-
tripping of the associated transformer circuit breakers on Primary and 25 kV side shall
also be affected due to other faults in the transformer, namely Buchholz trip, excessive
winding temperature and excessive oil temperature trip.
The IDMT over-current relay on the secondary side shall, however, trip the
respective circuit breaker on 25 kV side only. The inter-tripping of associated transformer
circuit breakers envisaged above shall be affected through a high-speed tripping relay with
manual reset contacts. Such inter-tripping relay shall lock out the closing of circuit
breakers from all modes of closing commands viz. Remote control, local control at the
panel and also at the circuit breaker mechanism, until the inter-trip relay or the lock out
relay (if provided separately), is reset manually.
Operating time of inter trip relay shall not exceed 20 ms. 10.5 Other Protective devices.
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The transformers as supplied by the purchaser shall be fitted with the following
warning and protective devices:
i) Low oil level alarm. ii) Buchholz relay with alarm and trip contacts.
iii) Oil temperature indicator with alarm and trip contacts.
iv) Winding temperature indicator with alarm and trip contacts.
v) Pressure relief device with alarm and trip contacts.
These contacts shall be wired up to a weather-proof terminal box mounted on the
transformer by the transformer manufacturer. The connections shall be extended to the
alarm and trip circuits as well as to annunciation scheme provided on the control panel.
11. DETAILS OF SCHEME OF PROTECTION FOR 25 kV OVERHEAD
EQUIPMENT
a) The substation equipment as well as the overhead equipment is protected against
short circuits and over-loads by means of feeder circuit breakers. The detailed feeding
arrangement has been indicated in the annexure 6 and the protection schemes at TSS, SSP
and SP are indicated in Annexure 7 (3 sheets).
b) The normal zone of feed of a substation to a neutral/APSS section varies from 6.5
to 25 Km., The spacing between the adjacent TSS, SP & SSP is of the order of around 1-
5 km. Under emergency feed conditions, the zone shall be extended up to the next
substation by closing the bridging CB at the neutral section and will be about double the
zone of normal feed. Over current or plain impedance relays which operate below a certain
impedance level and which function independently on the phase angle between voltage
and current, will be unable to discriminate such faults. Therefore, a relay working on the
principle of discrimination of the argument of the impedance is required. The protection
shall also have directional elements to distinguish the fault in a particular zone.
c) The OHE protection scheme shall fulfil the following functions-
i) To detect all short circuits over the affected zone of overhead equipment and
to open the circuit breakers of the affected zone only. The healthy section shall
remain unaffected.
ii) In case a sub-sector has been isolated due to a fault, then the balance healthy
section left shall continue to have the effective protection operational.
iii) To operate with minimum delay in opening the circuit breaker.
iv) To refrain from operation at the maximum working current, i.e. to discriminate
between the maximum load currents and short circuit currents even though the
magnitude of the former (maximum working current) is at times more than the
latter (short circuit current), especially when the faults are remote from the
substation.
v) To detect and isolate faults on the OHE caused by accidental coupling of two
different phases from adjacent substations.
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vi) To prevent flash-over at the insulated overlaps in front of the TSS, SSP
overlaps in the event of one of the wires of the OHE is switched OFF on
transient faults and a locomotive / EMU pantograph bridges the live and the
unearthed OHE. Relay shall also be able to give a signalling command as per
user’s requirement in case a communication link between adjacent TSS/SSP is
not provided by the purchaser. The purchaser shall specify his detailed
requirement to this extent while tendering.
vii) To provide high speed auto-reclosing of the feeder circuit breaker after a preset
time interval and to lock out if the fault reappears within a predetermined time
period. The auto-recloser shall have built in logic / intelligence as described in
the subsequent para.
viii) To provide a suitable protection device to detect and trip the feeder Circuit
Breaker in the event of High impedance Earth Faults.
ix) The protection shall be immune to variations in arc resistance of the faults and
the excitation current of the traction locomotive and power transformers. To
avoid transient tripping due to high starting currents of EMUs/Locos, the relay
operation shall be blocked in case 2nd Harmonics exceed 15 percent or a value
as mutually decided between the purchaser and tenderer.
x) To be immune to the regenerative currents. The protection should not act in
case the regenerative currents are fed back into the system.
xi) The main feeder protective relays like directional numerical distance
protection relay with 3 zones and polygonal characteristics, intelligent logic
base auto reclosure etc. shall have necessary interface equipments to ensure
the working of the relay over communication channel if the purchaser so
decide at a later date.
The details of protective system shall therefore be as follows: -
11.1Directional Numerical distance protection relay with 3 zones and polygonal
characteristics
11.1.1 The requirements are – a) Relays to be single phase version
b) Impedance characteristic shall cater for –
i) Load encroachment
ii) Sudden loads due to locomotives start up.
iii) Short line sections
iv) High resistance fault currents very close to load currents
11.1.2 The relay shall have the following essential features
a) Relay shall have polygonal characteristics, which includes parallelogram
characteristics.
b) The relay shall have 3 distance zones. Each zone can be set individually for its R
and X values. Each of the zones can be set in forward or reverse or non-directional
zone. Setting of relays for each zone shall be done depending on the measurements
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as per clause 15.1. The relay shall trip instantaneously in zone-I and with preset
delay in zone-II and III. It shall be possible to set the delay in the range from 50 to
2000 ms. in steps of 10 ms.
c) Zone I extension.
d) Zone 2 and 3 with train start-up detection –
In case of train start-up loads, zone II, III may pick up. The relay should detect
and avoid tripping.
e) Back up Over Current protection
f) A “Switch onto fault” feature (SOTF) shall be provided in the relay to provide high
speed tripping (of the order of one cycle) in case the breaker is closed onto an
existing fault on the line.
g) Over and under voltage protection with voltage supervision along with time delay
(optional).
h) Auto reclosing.
i) The errors in the relay shall not be more than + 5% for R, X, V, I and the measured Z
value.
j) Since the OHE parameters R & X shall be varying throughout the section and also
shall be changing during the various phases of the work execution, the relay shall be
capable of changing the R & X values to all possible combinations of the OHE. The
relay shall also be capable of changing the fault angle over a range of 50 to 85 degrees
in steps of 5+1 degrees. k) The accuracy of the relay shall be + 5 % including for voltage input to the relay from
125 volts down to 0.5 Volts, the frequency variations of 48 to 52 Hz and the ambient temperature variation over the range + 5 OC to + 50 OC.
l) The relay shall give a command to the auto reclosure to bypass it in the event of a fault in the 2nd zone or beyond.
m) The relay shall have facility to record and store fault waveforms for all CB tripping
cases with date and time stamping. 10 such waveforms shall be store as brought out in
details in the para 7.1.2 above.
n) The impedance reach of each zone of protection shall be manually adjustable over a
range of 0.04 ohm to 50 ohms. For time delayed zones, it shall be possible to
independently vary the zone time settings in a range of 50 ms. to 2000 ms. The timer
accuracy shall be + 5 % of setting.
o) The relay shall also be capable of changing the fault angle over a range of 50 to 85
degrees in steps of 1 degree (with accuracy of +1 %)
p) The relay shall continuously monitor the status of the feeder CB at TSS. In case the
feeder CB is not tripped after a preset time interval after initiating the trip command
then another trip command shall be given to the transformer CB to trip. Suitable alarm
confirming the failure of the concerned CB shall be displayed.
q) The relay shall continuously monitor the status of the feeder CB at SSP/SP. In case
the feeder CB is not tripped after a preset time interval after initiating the trip command
in zone-I then trip command shall be given to all the CBs connected to the concerned
bus of SSP/SP to trip. Suitable alarm confirming the failure of the concerned CB shall
be displayed r) The PT voltage is continuously monitored by the relay in case of blowing out of the
PT fuse (conditions when PT is low but the current is less than the set current) an alarm
shall be given out after suitable settable time delay. In case the PT voltage is low and
the current is more than the set current the relay shall trip the feeder CB.
s) The relay shall have feature of on line fault locator with an accuracy of +2 %.
Necessary interface equipments are to be provided to send the fault location in km.
from relay location to remote control centre through SCADA. t) The relay shall be blocked for operation in case second harmonics exceed a
predetermined set limit. The limit of blocking the relay shall be decided between the
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purchaser & tenderer after carrying out measurements as in 15.1. To start with, the relay shall be blocked for operation in case 2nd harmonic current exceeds 15% of the fundamental current.
u) The relay shall discriminate correctly between faults in the forward and reverse directions on the event of voltage input to the relay falling down to 0 V. To maintain a correct polarizing (directional reference) signal for the distance element and to enable fast operating time under conditions of close-up faults, the relay shall utilize memory polarization. The polarizing signal shall be derived from sufficient samples of the pre-fault voltage held in memory.
11.2 High impedance type differential protection relay for bus bar
Protection against bus faults shall be provided by means of a sensitive high
impedance differential protection relay. The relay shall be of the high-speed type and
operates in less than 40 milli- seconds for 2 times the rated current and in less than
15ms at currents of 10 times the set value. The following features shall be incorporated
in the relay. The setting of the relay shall be suitably adjustable in appropriate steps. The relay
shall have overload current handling capabilities up to 2 times the set current permanently
& 40 times the set current for one second. The relay shall not operate for maximum
through fault current. Suitable number of output trip contacts shall be provided on the
relay to trip the desired CBs simultaneously.
11.3Definite Time Over Current Relay
11.3.1 Directional definite time over current relay with instantaneous over current element at
TSS A definite time over current protection shall be used with an adjustable current
setting ranging from 0 to 50 Amp and time setting from 0 to 5000 ms., with an
instantaneous over current element, adjustable from 0 to 100 Amp, which clear faults at
the traction substation. The instantaneous element shall be with operating time not
exceeding 20+2 ms. for the set current. Below the set current there shall be no operation
of the relay. The error shall not exceed + 5 % the set currents. 11.3.2 Directional definite time over current relay at SSP/SP
A definite time over current protection shall be used with an adjustable current
setting ranging from 0 to 50 Amp and time setting from 0 to 5000 ms. 11.4Wrong Phase coupling prevention Relay
An impedance relay for protection against wrong phase coupling which shall operate on the principle that the relay identifies a wrong phase coupling condition when the impedance lies between 2 to 60 ohm with adjustable lower & higher impedance range and its angle lies in the second quadrants between 110o to 150o in the R-X plane. All parameters expressed are in secondary values. The relay shall be immune to the regenerative currents.
11.5Logic Based Intelligent Auto recloser
11.5.1 Whenever a feeder circuit breaker is tripped due to operation of the following feeder
protective relays, namely distance, wrong phase, high impedance earth fault relay and
instantaneous over-current relays, the concerned auto reclosing scheme shall close the
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breaker after a pre-set dead time of 0.5 second (adjustable from 0.1to 1 seconds). If the
breaker trips again due to persistence of fault during the reclaim time 30 seconds
(settable 6 to 60 seconds) of the auto reclosing scheme, the scheme shall get locked out.
11.5.2 It shall be possible to reset the locked-out state either locally or through remote control.
Necessary contacts for telesignalling the locked-out state and for resetting the same
shall be provided for interfacing with the remote-control equipment. Irrespective of
whether the auto reclosing scheme is in the normal condition or in the locked-out
condition, it shall be possible to operate the circuit breaker locally as well as through
remote control.
11.5.3 A single shot high-speed auto-reclosing scheme shall work in conjunction with the
Master Trip relay to operate the feeder circuit breaker. The auto-reclosing scheme shall
be designed for a dead time adjustable between 0.1 and 1 second in steps of 0.1 second
(normally to be set at 0.5 second) and a reclaim time adjustable between 6 and 60
seconds (normally to be set at 30 seconds, the operating duty of feeder circuit breaker
being 0-0.3s –CO –30 s- CO). 11.5.4 Any section is fed from both sides by circuit breakers at adjacent switching posts- one
on the TSS side and next on other side. A fault on the OHE is cleared from both
directions so as to isolate the minimum possible section. After tripping, auto-reclosure
operates and closes CB on TSS side first. Other side CB shall close after assurance that
the fault of temporary nature has been cleared. This shall be ensured by the auto-
reclosure of other side CB, which shall continue to sense the PT supply and if the supply
remains for a period as set in the reclaim time, the auto-reclosure shall close the other
side CB. 11.5.5 The auto reclosure shall be blocked in the event of high current earth faults above 2000
to 10000 in steps of 1000 Amps on the OHE. Suitable sensing circuits shall be available
for the relay from the current transformer to activate the bypass. The tenderer shall
make relay settings accordingly. A manual over -ride of this blocking shall be provided.
11.5.6 The auto reclosure shall have facility to repeat the reclosing on the fault again for the
second time after a time lag settable from 10 sec to 60 sec in steps of 1 sec during the
reclaim time. Such facility can be switched ON or OFF by the purchaser to his
requirements. Such reclosures however shall be automatically blocked in event of high
current earth fault for the set currents as explained in para 11.1.2(l) & 11.5.5 or a fault
detected by the distance relay in the 2nd zone or beyond. 11.6 High Impedance Earth Faults (back up)
11.6.1 Instances of low current faults not getting detected by distance protection relays have
been reported. Such faults sometimes get cleared by the transformer OCR (IDMT) relay
after a considerable period which may be dangerous. 11.6.2 Protection against such high resistance earth faults shall be provided by a Vectorial
Delta I type of relay. The relay shall work on the principle of detecting Delta I scalar
as well as the vectorial components of the delta I current to decide the tripping of the
relay. Also, the relay shall have reactance blinders of range 0.5 to 30 Ohms (selectable
in steps of 0.1 Ohms). A trip command shall be generated after evaluating both the
Scalar and Vectorial component of the delta I. 11.6.3 The relays sensitivity shall be restrained by 50 % if second harmonics are more than
12% and/or third harmonics are more than 15%. The setting range of the relay shall be
from 1 amp to 6 Amps settable in the steps of 0.1 Amps. The accuracy of current setting
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shall be + 7.5 %. The restraining features of the relay shall be reviewed along with
RDSO after the measurements at 15.1 have been completed.
11.6.4 The relay shall act as a back up to the main directional distance protection. The relays
operating time in no case shall be more than 70 ms. Additional time delays of 500 ms.
settable in steps of 25ms shall be provided to the relay. The relay shall continuously
sense the status of feeder protection relay and the MTR and give trip command to the
breaker only when these relays have failed to clear the fault. Detailed calculations for
the setting of the relays shall be carried out by the tender and approved by RDSO before
actually putting in the field. 11.7 Reverse power flow prevention Relay
In case of double-ended feed, reverse flow of power back into the grid from the
energized TSS is required to be prevented beyond a set limit. A suitable reverse power
relay shall be provided, sensing power from the 25kV side to trip the primary CB in case
the reverse power flow beyond the set regenerative reverse power levels. The relay shall
be set based on amount of reverse power and operate on time delay. The reverse power
(current) shall be settable from 0 to 5 A (in steps of 0.01 A) and time delay from 0 sec to
30 sec. (in steps of 0.5 sec). 11.8 Panto-Flashover prevention/signalling relay
11.8.1 Provision of this relay and associated communication media and interface equipments
at TSS/SSP/SPs shall be optional and provided if demanded specifically by the
purchaser. Purchaser shall clearly specify whether the concerned subsector is to be
made dead by panto flashover relay or flasher light indication is to be given for warning
locomotive drivers as per clause no. 9.8.6. 11.8.2 In the event of a tripping of circuit breaker(s) due to intermittent fault on one of the
sides of the FP /IOL and an electric train entering from a live to a dead section of the
IOL, a heavy flash - over may occur, when the pantograph negotiates the IOL,
depending on the intensity of current being drawn, with chances of consequential
damage to OHE. In case of transient faults, auto reclosure of CB would obviate this but
in case of persisting faults or it reclosure gets delayed, the possibility of flashover will
exist.
11.8.3 Such needs be managed by ensuring that the live subsector is made dead by tripping
the concerned CBs simultaneously. A logic for various such conditions in which
tripping of both CB’s of the FP IOL required shall be generated by a microprocessor-
based logic/suitable relay scheme and whenever such trippings are required the same
shall be identified and done by the relay. Further, the relay shall have given tripping
command to the concerned CB at adjoining TSS/SSP/SP to make the live subsector
dead.
11.8.4 Detailed calculations of tripping time, train operation time, relay operating time and the
CB tripping time shall be done by the tenderer and approved by RDSO before
developing the relay. The relay shall be developed in lines with RDSO specification
no. TI/SPC/PSI/PROTCT/2982 or latest.
11.8.5 For making the live subsector dead, pantoflashover relay to be provided at TSS/SSP/SP
shall have communication features and necessary interface. On its actuation relay shall
give trip command to the circuit breaker at the concerned post and through its
communication trip the circuit breaker at adjoining post (TSS/SSP/SP) so as to make
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the concerned sub-sector dead. The details of communication media between different
switching control posts (TSS/SSP/SPs) shall be furnished alongwith cost as option. The
purchaser may get this communication media supplied / erected from the tenderer or
can separately procure / erect between the posts as per the technical requirements given
by the tenderer. Works related to interfacing the communication media and C&R panel
shall be done by the successful tenderer. The tenderer shall also provide a continuous
monitoring system for this communication link and in case the communication link
become ineffective/ disconnected/short circuited an alarm shall be sounded to the user.
11.8.6 The relay in addition will be capable of closing a contact for initializing a flasher light
for warning locomotive drivers. Suitable relays / contacts capable of handling the
flasher light current shall be provided by the tenderer. The flasher light shall be capable
of working independently whether the communication links between the adjacent SSP,
TSS exists or not. The provision of the contactors & flashers light for warning & power
supply for the flasher lights and outside the scope of work to this specification. 11.9 Master trip Relay
The relays as explained above in item 11.1, 11.2, 11.3 shall trip the corresponding
feeder circuit breaker in case of fault, through a high speed self-reset type tripping relay
to be designated as Master Trip relay. The relay shall have an operating time of not more
than 12 ms. and a resetting time of not more than 100 ms. The relay shall be capable of
handling the current of the CB trip coil.
12. DETAILS OF 25 kV CAPACITOR BANK PROTECTION
(optional, if asked for by the purchaser)
The protection system for capacitor bank if asked for by the purchaser in the tender
shall be as per the relevant RDSO specifications of capacitor bank viz. ETI/PSI/67 (11/96)
with A&C slip no. 1 to 7- for shunt capacitor bank or TI/SPC/PSI/THYCAP/0030- for
thyristor switched capacitor bank or any other latest RDSO specifications. 13. OTHER RELAYS AND PROTECTION
13.1. Low Voltage Tripping at the SP
An instantaneous under voltage relay shall be provided by the tenderer to trip the
bridging interrupter or circuit breaker at the neutral section in case of under voltage during
emergency feed conditions. The relay shall be connected to one of the existing PT Type
II and shall have voltage settings of 19 kV, 17 kV and 15 kV below which if the voltage
at the SP drops the sectioning circuit breaker shall operate. 14. INSPECTION AND TESTING
14.1. General
The inspection of the control and relay panel shall be carried out by an authorized
representative of the purchaser. Prototype inspection shall be done by RDSO. After
successful completion of all the type and routine tests as per this specification, prototype
approval shall be issued by RDSO. After approval of prototype, inspection and routine
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tests on the balance quantity shall be done by the authorized representative of the Indian
Railways as per purchase order.
14.1.1. Only after all the design and drawings have been approved and clearance given
by Research Design and Standards Organization (RDSO) to this effect, the
manufacturer may take up manufacture of the first prototype unit for RDSO
inspection.
14.1.2. Before giving the call to RDSO for inspection and testing of the prototype of
the equipment, the manufacturer shall submit a detailed test schedule consisting
of schematic circuit diagrams for each of the tests and nature of the test, venue of
the test and the duration of the test and the total number of the days required to
complete the tests at one stretch. He should have carried out the routine tests
himself and ensured that the relay and the C&R panel is as per SOGP and this
specification. The inspection call shall be given 30 days in advance from the
actual inspection date at the factory.
14.2. TESTS
The entire prototype test on all the relays and control and relay panel shall be
carried out by RDSO engineers at the manufacturers works before the dispatch of the first
set of relays. Tests conducted at a prior date shall not be acceptable if not conducted in
presence of RDSO. The cost of the testing shall be borne by the tenderer.
14.2.1. Type Tests
The relays shall be type tested as per IS:3231, IS:8686 & relevant IEC. All
instruments, interposing CTs and any other equipments as the purchaser may desire shall
be type tested as per the latest version of respective standard IS/IEC Specifications
applicable. The following type tests shall be carried out on the prototype relays.
i) Temperature rise of the coil of the relay shall not exceed the limits of 55 oC and 80
oC for Class- A and Class-B insulation respectively.
ii) Mechanical endurance test for 10,000 operations.
iii) Operating time test.
iv) Quadrature test
v) Reset value test.
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vi) Reset time test. vii) Making and braking capacity of contacts
viii) Overload test
ix) Impulse voltage withstand tests applicable test voltage class-III.
x) High frequency disturbance test applicable to test voltage class-III.
xi) Vibration test on the complete panel at a frequency 16.7 Hz, maximum
amplitude 0.4mm, 10 minutes each for back and forth for right and left and
for up and down. After this test the operational characteristics of relays will
be confirmed.
xii) Verification of characteristics of relays.
xiii) Environmental Tests:-
(1) Dry heat test as per IEC 60068-2-2 (1974)
(2) Damp heat test, steady state as per IEC 60068-2-3
(3) Damp heat test, cyclic as per IEC 60068-2-30 (1980)
xiv) EM Compatibility tests: - (1) Interference suppression as per IEC 60255-92-1 - 1 MHz burst test,
2.5 kV common mode & 1.0 kV differential mode. Test duration -
more than 2 secs.
(2) Immunity to Electrostatic discharge as per IEC 60255-22-1
(3) Immunity to Radiated EM energy as per EN 61000-4-3, 80 –
1000 MHz, 10 V / m, Antenna, greater than 1 m from all sides.
(4) Electrical Fast Transient or burst requirements as per IEC 60255-22-4
(5) Surge Immunity as per IEC 61000-4-5
(6) Immunity to conducted disturbances.
(7) Power Frequency Magnetic Field Immunity. (8) A.C. ripple in D.C. auxiliary
xv) In addition to the above, all routine tests detailed in Clause 12.2.2 below
shall also be carried out on the first prototype.
Only after clear written approval of the results of the tests on the prototype is
communicated by RDSO/Purchaser to the manufacturer, he shall take up bulk
manufacture of the equipment – which shall be strictly with the same material and process
as adopted for the prototype. In no circumstances shall material other than those approved
in the design/drawings and/or the prototype be used for bulk manufacture on the plea that
they had been obtained prior to the approval of the prototype.
14.2.2. Routine tests
All relays, instruments, interposing CTs and other equipments shall be subjected to
routine tests at the manufacturer’s works as per the relevant standards. The following
checks and tests shall be carried out on the complete control and relay panel:
14.2.3. Visual Checks
General check of the control board in respect of construction, wiring, provision of
various equipments/relays etc.
14.2.4. Operation Tests
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Operation tests on all equipments, switches and tests to prove correctness of wiring
of various circuits including indications, alarms, operation of relays and annunciation etc.
14.2.5. Power frequency high voltage withstand test
Voltage test on the panels with all equipments and wiring for a withstand voltage
of 2 kV (rms) to earth for one minute.
14.2.6. Insulation Resistance test
Measurement of insulation resistance of the complete panel wiring, and circuit by
circuit, with all equipments mounted on the panel, by using 1000 V meggar.
14.2.7. Auxiliary Power Consumption test
Power consumed by the panel with and without protective relays at 110 v d.c.
15. ERECTION, COMMISSIONING AND PROVING TESTS
15.1. The Tenderer shall carry out the following test along with purchaser for
ascertaining the different parameters / values to be used for relay setting and its
normal functioning.
i) Harmonic analysis of each TSS on Primary and secondary side for current
and voltage harmonics for a period of 7 days. ii) Wave form recording and analysis of each an every fault occurring on the
OHE for a period of six months.
iii) Actual field measurements of R & X value of the OHE in each sub sector and
including the values of rail impedance, earth wire impedance and OHE
impedance.
iv) To develop fault current characteristics v/s fault clearing time characteristics
and evolve which relay shall clear the fault for various recommended range of
settings of the relay to evolve time coordination and setting of various relay
times for effective coordination of the relays.
v) To record actual transient voltages coming on the 25 kV side for a period of
six months.
vi) Magnetic inrush currents generated due to switching on the traction
transformer and locomotive/EMU transformers shall be measured at site and
harmonic contents of inrush current determined for magnetic inrush period.
vii) Power factor on the 25 kV side of the TSS recorded for one month in order to
determine the maximum, minimum and average power factor at the TSS.
viii) Regenerative braking current fed back into the grid recording for a period of
one month.
ix) Ferro-resonance studies shall be carried out for each TSS location to ascertain
the possibility of any sub-harmonic resonance effect on the system during the
initial switching ‘ON’ of the supply.
x) Testing of impedance bonds of S & T department for their satisfactory
behaviour on harmonic load current and fault current impact on impedance of
the bond.
15.2. The erection and commissioning of relay shall be done by the successful tenderer
who shall arrange all tools, plants, instruments and other material required for the
purpose at his own cost. Tests shall be carried out during erection/commissioning of
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the relay at the site in accordance with the testing guidelines finalized with RDSO.
Tests shall be carried out on the relay in the presence of the purchaser’s
representatives to check the erection and commissioning of the relay.
15.3. Three sets of the test report shall be supplied by the manufacturer to the purchaser
for records and reference.
15.4. Proving tests of protection system shall be done by the tenderer by actual
simulation of the faults in the field. The location of fault simulation shall be furnished
by tenderer to RDSO for approval. The protection system will be considered
acceptable if the dependability index is nearly 100 % during the proving tests.
15.5. Commissioning of the protection scheme shall be done in stages from one end of
the section under conversion. Satisfactory performance of section with two TSSs
including its parallel operation shall be observed for a limited period of minimum two
months. Any changes / modification required in the relays and C&R panel during
above period shall be carried out and shall be implemented in the subsequent sections
without any financial implications.
16. TECHNICAL DATA AND DRAWINGS
16.1. The tenderer shall furnish guaranteed performance data, technical and other
particulars for the equipment offered in the Performa attached as Annexure-4.
16.2. The tenderer shall furnish their compliance or otherwise against each clause/sub-
clause of the technical specification. If the tenderer wishes to deviate from the
provision of any clause/sub –clause, he shall furnish the full details with justification
for such deviation.
16.3. The tenderer shall furnish descriptive pamphlets and the recommended relay setting
and time coordination with supporting calculations for complete protection scheme.
The range of setting available, calibrated in terms of single track OHE, shall be clearly
stated and adjustments available for intermediate setting explained. The scheme shall
include the condition of failure of main protection and clearing of fault by backup
protection at identified locations.
16.4. Successful tenderer shall be required to submit the following detailed outline dimensioned drawings (including reproducible copies as per the Railways standard sizes of 210 mm x 297 mm or multiple thereof for approval). Also, the approved drawing shall be submitted in AutoCAD-14 or latest on a CD ROM.
(i) Dimensioned drawings of the control & relay panel indicating front and
rear views with the layout of instruments, mimic diagram, control switches,
indication LED’s, push buttons, protection relays and other equipment’s
etc. clearly marked. (ii) Exploded view of the rear and front of the system indicating the disposition
of various equipments inside the control, protection and metering system.
(iii) Schematic diagram of D.C. control circuits for transformer protection,
OHE protection, capacitor bank protection and control of circuit breakers,
interrupters and motor-operated isolators (if any).
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(iv) Schematic diagram of alarm, indication circuits and event logging
system.
(v) Schematic diagram of A.C. circuits showing connection of CTs and PTs
and associated protective relays.
(vi) Drawing showing the legend of various reference/codes adopted for
equipments, protection relays and all other accessories used in the control,
protection and metering system.
(vii) Drawing for name plates/identification labels engraving details.
(viii) Any other drawings considered necessary.
17. OPERATION, MAINTENANCE INSTRUCTIONS & TRAINING
17.1. The Control and Relay panel shall be maintenance free generally not needing any
maintenance, however the tenderer shall mention a maintenance schedule which shall
be detailed enough to guarantee failure free service of the relay to the purchaser. The
supplier shall supply free of cost 5 copies to the consignee of the Instruction Manuals
for operation and maintenance of the equipment. The manuals shall contain full
particulars of various components, full dimensioned drawings and circuit diagrams.
The manual shall be approved by RDSO prior to the issue to the consignee.
17.2. The tenderer shall train free of cost 10 of the associated engineers/supervisors for 7
days in the maintenance, operation, relay setting procedure, trouble shooting and
commissioning of the relay. This training shall be done at the installation site and shall
be given to the basic users. The purchaser shall ensure that he gives to the supplier
technically competent officials for the purpose of this training. Graduate engineers
shall be preferred for this training.
17.3. The tenderer shall quote separately for maintenance tool, kits and test instruments
required for satisfactory maintenance and operation of the relay. The test kit jig shall
be complete in all respects to test the individual cards of the C&R panel and the
complete kit as a whole. The tenderer shall quote for spares require for the relay for 5
years of trouble-free operation beyond the warranty period.
17.4. The successful tenderer shall develop & provide a maintenance schedule and a trouble
shooting chart for effective, reliable and trouble free relay operation. The basic
maintenance schedule along with the troubleshooting, diagnostic chart shall be
submitted to RDSO and approved by RDSO prior to commissioning of the relay for
the first time at the sight.
17.5. The successful tenderer shall submit two sets of guide lines for relays setting along
with time coordination and supporting calculations, for complete protection scheme to
RDSO for scrutiny and approval before commissioning of the panel. After successful
completion of commissioning and proving tests in field the tenderer shall submit final
relay setting guide line to RDSO for scrutiny and approval. Five copies of approved
relays setting guide line shall be supplied to purchaser and two copies to DG (TI)
RDSO Lucknow for record.
17.6. The successful tenderer shall develop erection and commissioning manuals, operating
manuals, troubleshooting guidelines and after its approval by RDSO shall supply five
copies of to the purchaser and two copies to DG (TI) RDSO Lucknow for record.
18. WARRANTY
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18.1. The control and relay panel supplied against a purchase order/contract in which this
specification is quoted, irrespective of original individual equipment (imported
/indigenous) shall be guaranteed for trouble – free and satisfactory performance for a
period of 30 months from the date of supply or 24 months from the date of
commissioning, whichever period is earlier, details of warranty clause, the extent of
responsibility and other relevant aspects shall be included in the purchase order or the
contract. The tenderer shall furnish detailed terms and conditions in this regard in his
offer.
18.2. The successful tenderer shall make necessary arrangement for closely monitoring the
performance of the relay through periodical (preferably continuously for the first year
and once a month during the second year of the warranty period) visits to the relay
installation TSS for on the spot detailed observations. Arrangements shall also be made
for spare parts, relays and other items to be kept readily available with the
manufacturer/ supplier / successful tenderer to meet exigencies warranting
replacement so as to put back the relay in service without unduly affecting the
operations of the TSS.
19. SERVICE SUPPORT AFTER WARRANTY AND AMC
19.1. The tenderer shall confirm the maintenance support of the relays / C&R panel
supplied by him for a period of at least 10 years from the date of commissioning on
the panel. The tenderer shall quote for maintenance spare, which the purchaser should
have for maintaining of the relays, C&R panel for a period of 5 years. The tenderer
shall also quote in his offer the maintenance equipment, instruments and T & P, which
the tenderer should have in order to maintain the relays and the C&R panel effectively.
19.2. The tenderer shall also quote for an option of maintaining the entire C&R panel by
him for a period of 10 years after the date of warranty period. Such AMC shall include
supply of all the material required for maintenance, repairs of relays and testing of the
relays at periodic intervals. The tenderer shall take necessary measures to ensure that
the downtime of the equipment is the least.
Purchaser may incorporate clause in the tender documents for AMC such that
payments are based on the availability/ downtime of the equipment in slab rates. A
fixed period of time after communication of the failure, for which downtime shall be
reckoned, will be decided by the purchaser/ railway.
20. SPECIFICATION CONFIRMATION
20.1. The tenderer shall go through each and every clause, drawings, Annexure of this
specification and indicate compliance to the specification. If there are deviations,
detailed reasons for the deviations supported by calculations, drawings, international
practices shall be essentially required for evaluating the tender offer. Wherever such
deviations have not been furnished it shall be deemed to be understood that the tenderer
has accepted all the tender conditions as mentioned in the specification. 20.2. The tenderer shall also enclose the schedule of guaranteed particular of the relay/ C&R
panel in the format as mentioned in the Annexure 4. Extra information to bring out the
schedule of guaranteed particulars more effectively may be included separately.
20.3. The tenderer is advised to refer the material schedule for the particular section as
enclosed by the tenderer in the proforma as in Annexure 5. Tenderer shall go through
the Annexure 5 material schedule in details and submit his offer accordingly. Any
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clarification, understanding of the requirement shall be clarified from the purchaser by
the tenderer before submitting his offer. Any minor modification essentially required
for successful integration and working of the Scheme/System shall be considered to be
well within the scope of the tenderer.
21. TENDERER’S CREDENTIALS
The tenderer shall be a RDSO approved supplier for protective relays on I.R. for
the past 5 years or shall be a firm of International repute supplying protective relays to
railways for at least 5 years and must have supplied for at least three projects. The tenderer
shall enclose necessary documents in support at the time of submitting his offer. The
tenderer should have been involved in developmental activity for developing the main
feeder protection relays for Indian Railways or any other Foreign Railways.
22. IMPORTED RELAYS
The tenderer shall clearly specify at the time of tendering whether any imported
relays are being provided. If so the technical details of the relays shall be indicated by the
tenderer. All such relays are required to be type tested at manufacturer works abroad by
RDSO representatives before dispatch of the relays to the purchaser.
All the provision contained in RDSO’s ISO procedure laid down in document No. QO-D-
8.1-11 dated 01.07.2020 (Titled “vendor –change in approved status”) and subsequent
version/amendments thereof, shall be blinding and applicable on the successful
vendor/vendors in the contracts floated by railways to maintain quality of products
supplied to railways.
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ANNEXURE 1
LIST OF ABBREVIATIONS
Abbreviation Full Form of the Abbreviation
A Amperes
AFTC Audio Frequency Track Circuit
AMC Annual Maintenance Contract
ASNS Automatic Switched Neutral Section
BT Booster Transformer
C&R Control and relay panel
CB Circuit Breaker
DCTC DC Track Circuit
DMT Definite Minimum Time lag
GPS Global Positioning System
GTO Gate Turn Off Thyristor IDMT Inverse Definite Minimum Time lag
IED Intelligent Electronic devices
IOL Insulated Overlap
LBBU Local Breaker Back Up
LCD Liquid crystal diode
LED Light emitting diode MSG Maintenance Study Group. MTBF Mean Time Between Failure
MTR Master trip Relay
NC Normally closed.
NO Normally open
OHE Over Head Equipment
PTFE Poly Tetra Flouro Ethylene
RC Return Conductors.
RDSO Research Designs & Standards Organisation
RTU Remote Terminal Unit
SCADA Supervisory Control & Data Acquisition System
SOTF Switch On To Fault
SP Sectioning Post
SR Self Reset
SSP Sub Sectioning Post
THD Total Harmonic Distortion
TRD Traction Distribution
TRS Traction Rolling stock
TSS Traction Sub Stations
WPC Wrong Phase Coupling
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ANNEXURE 2
DEFINITIONS
Item Definition
Audio In AFTC type of track circuit, Audio Frequencies in the range of 1500 Hz
frequency to 10000 Hz are used. The traction return is connected through an
track circuit impedance bond capable of handling the traction return load and fault
(AFTC) currents. The center point of it is connected to the traction return from the
TSS while the remaining 2 terminals it shall be connected to the rails. Basic time The shortest operating time of distance protection, for example, the time of
the first step or zone in a stepped curve distance-time protection.
Breaking The maximum current and volt– amperes that the contact is able to
capacity interrupt successfully under specified conditions without significant
damage to contact. Contract Means the contract resulting from the acceptance by the purchaser of the
tender either in whole or part DC track DCTC is the conventional track circuiting generally available in all
circuit conventional system where the traction transformer neutral point is
connected to one or both the traction rails near the TSS. The masts are
earthed by connecting them to the traction rail and on the track circuit
portion only one rail is available for traction returns and in the non-track
circuit regions both rails are available for the purpose of traction return
currents.
Dead time Dead time is the period taken by the auto reclose mechanism to close the
breaker after the same would have tripped on fault. In other words, the
time from the instant of fault detection up to the instant of closing of
breaker by auto-reclose system. Differential A unit protective system in which an algebraic comparison is made of
protective primary current at two or more points in the power system.
system Double ended The adjacent TSS are on same phase and are connected in parallel. There
feeding may or may not be a neutral section on SP for such feeding arrangement.
Equipment Means all or any equipment considered necessary by the purchaser
engineers for the satisfactory operation as a whole of the installation
including structure, foundations etc.
Making The maximum current and volt–amperes the contact is able to make
capacity successfully under specified conditions without significant damage to the
contact. Normally A contact, which is closed when the relay is de-energised. closed contact (NC)
Normally A contact, which is open when the relay is de-energised.
open contact
(NO)
Operating The time, which elapses from the appearance of the abnormal conditions, time which cause the operation of the protection until the protection initiates
tripping or alarm.
Primary The primary side of the transformer shall be defined as the side with
incoming voltage from the Supply authority on 220, 132, 110 kV as the
case may be. Protected The part of an installation guarded by a certain protection. zone
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Purchaser The person / agency who has floated the tender for execution of the work
on or behalf of the president of India. Railway Means Railway(s) in whose territorial jurisdiction the work is to be carried
out and includes the Government of India, Ministry of Railways (Railway
Board), and /or general manager of the railways concerned
Reclaim Reclaim time is the duration for which the auto reclosing mechanism
time remains ineffective after first reclosure of circuit breaker by auto-reclose,
irrespective of re-occurrence persistence of fault. In other words, the
breaker will not be reclosed second time by the auto-reclose device had the
same tripped on fault again within the reclaim time after its first reclosure
on the auto-reclose system.
Relay back- An arrangement, which provides an additional, relay using the same or
up different principle of operation from that of the main relay.
Remote An arrangement at the next station in the direction towards the source
back-up which trips after a delayed time if the CB in the faulty section is not
tripped.
Secondary The secondary side of the transformer shall be defined as the side feeding
the OHE i.e.25 kV side.
Sector Distance between the TSS and the SP
Single ended The TSS is feeding up to SP which is a neutral section. The phases on
feeding either side of the SP are different.
Sub-sector Distance between the TSS and the adjacent SSP/ SP or the distance
between the SP and the adjacent SSP/SP.
Switch on to SOTF feature for protective system becomes active once a CB has tripped
fault (SOTF) on a fault. CB is in open condition and when it is closed on fault existing in
feature the system. The feature starts by detecting V0 and I0 in the circuit at the
time of closing of the CB as a starting point for the SOTF feature. This
feature remains active for a period of around 200 milli-seconds from the
time of breaker closing. This feature shall give instantaneous operation of
the relay.
Synchronise The relay shall operate for close up faults in the forward direction but it
polarization shall restrain for close faults in the reverse direction. To ensure such
OR memory operation memory polarisation feature shall be provided in the relay for
polarisation correct direction discrimination.
Tenderer The vendor, supplier who intends to quote for the tender floated by the
purchaser. The agency who shall quote for tender floated by the tenderer. Time lag Intentionally introduced time interval between start and completed
operation of the protection. Track circuit It is the circuit providing passage of traction current through arrangement
of track bonding.
Unit A protective system, which is designed to operate for abnormal, conditions
protection inside and remains stable for abnormal conditions outside a specified zone
of the protective system.
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ANNEXURE 3
GOVERNING AND RELATED SPECIFICATIONS
The relays shall, unless otherwise specified shall conform too generally to the
latest edition of Specifications mentioned below:
IEC 60068-2 Environmental Tests
IEC 60255 -3 Single input energising quantity measuring relays
with dependent or independent time.
IEC 255 -6 Measuring relays and protection equipment.
IS-2705 (Pt. IV) Protective current transformers
IS 3231 Electrical relays for power system protection
IS 8686 Static protective relays
IS-2705 (Part I to IV) Specification for Current Transformer
IS-3156 Specification for Potential Transformer
IS-4237 Switchgear general requirements
IS-5578 & 11353 Panel wiring
IS-8623 Factory built assemblies of switchgear and control
gear for voltages unto and including 1000V a.c. and
12V d.c.
IS-8828 Miniature circuit breakers
IS-9224 HRC cartridge fuse
IS-6875 Control switches/push button
IS-1248 Indicating instruments
IS-2147 Degree of protection
IS-694 PVC insulated cables for working voltages up to
and including 1100 V
IS-10810 (part 53) Methods of test for cables: part 53-flammability
test
The above specifications shall be applied in a manner altered, amended or
supplemented by this specification and the latest Indian Electricity Rules wherever
applicable. Any deviations from the specifications proposed by the tenderer at the
tender/prototype stage, to improve the performance, utility or efficiency of the equipment
shall be given due considered provided full details of the deviation are furnished by the
tenderer to the satisfaction of the purchaser. In such cases the tenderer shall quote
according to the specification as well as with the deviations from the specifications.
Other related and linking specifications of the equipment to which the relays
get linked or derive signals are -
TI/SPC/PSI/PTs/0990 220/132//100/66/25 kV PTs
ETI/PSI/90(6/95) 25 kV current transformer
with A&C 1&2 ETI/PSI/117(7/88) 220/132/100/66 kV current transformer
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with A&C 1 to 6
TI/SPC/PSI/CB/0000 For 25 kV single poles, double pole and primary side
22 kV, 66 kV, 100 kV, 110 kV, 132 kV and 220 kV
two pole/three pole vacuum and SF6 CBs for AC
traction substations.
ETI/PSI/167(9/97) 25 kV interrupter
ETI/PSI/163(4/97) 21.6 MVA, 100/27 kV,22/27 kV single phase ONAN
with A&C 1 traction power transformer
ETI/PSI/120(2/91) Code of practice for earthing
TI/SPC/PSI/PROTCT/2983 Prototype specification of pinto flashover protection
relay for 25 kV system
ETI/PSI/65(1/97) with A&C 1 Specification for C&R panel with static relays
TI/SPC/PSI/PROTCT/1982 Prototype specification for delta I fault selective relay
for fault selective system.
TI/SPC/PSI/OFC/0050 Specification for 24 core armoured optic fibre cable
for use in Indian Railway Traction Installation
System
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ANNEXURE 4 SCHEDULED OF GURANTEED PARTICULAR
(TO BE SUBMITTED BY THE TENDERER AT THE TIME OF
SUBMITTING HIS TENDER OFFER)
The tenderer shall be required to submit the following detail to the purchaser at
the time of tender scrutiny in order to technical capability of the tenderer to carry out
the work. AMBIGUOUS or incomplete information like “or” “shall be given later” can
lead to technical rejection of the other. WHEREVER deviation is quoted they shall be
supposed to be supported with detailed technical benefits and/or financial benefits.
S.No. Description Manufacturer’s details
1.0 General
1.1 Name of the manufacturer
1.2 Governing specifications
1.3 Are you an RDSO approved firm?
1.4 Have you been a regular supplier to Indian
Railways for past 5 years
1.5 Have you gone through the specification
in details? Attach a point wise compliance
for each item as an Annexure whether you
shall be able to do the specific item of the
specification or not. Indicate clearly the
clause number of the specification not
acceptable to you. And give details,
elaborate reasoning for clauses not
acceptable to you.
1.6 Does your company have a formal setup
for training? Elaborate training facilities
and your experience in preparation of
quality training materials.
2.0 System Particulars 2.1 Have you gone through the specification
in details and also visited site of work to
understand the in depth requirement of the
tender.
2.2 Will you be able to provide the scheme
with the desired accuracies so that up to
90 % of the trippings occur only in the
zone in which the fault occurs? 2.3 Will you be able to provide the scheme in a
manner explained in the specification so
that there is no impact whether the bus
coupler CB’s at SSPs & SPs are open OR
closed condition, provided or not provided
and adjacent TSSs are operated in parallel
or not. 2.4 Name the relays, which shall be required
to be developed by you as per this specification.
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2.5 Whether any relay used is an imported
relay. Confirm that the relay shall be tested
by RDSO at its works abroad before
dispatch of the relay for Indian Railways.
3.0 Particulars of C & R Panel
Units Values/details
3.1 Rated control voltage with Volt DC
variation
3.2 Rated VA burden on CTs & VA
PTs
3.3 Power consumption Watts
3.4 Impulse and power kVp & kVrms
frequency withstand voltage
values
3.5 Dimensions: Length mm
Width mm
Breadth mm
Weight of the relay grams
3.6 Rated Vibration withstand microns
3.7 Shall the test kit for relay
testing be supplied? If yes
enclose technical
particulars.
3.8 How shall the C&R panel
be interfaced with SCADA
Serial Port or Hard wiring
3.9 Are there any deviations to the RDSO specifications? If
yes enclose clause wise
deviations and reasons of
deviations.
4.0 Particulars of HV bus bar differential protection Units Values/details
4.1 Manufacturer
4.2 Relay Identification number
4.3 Range of relay setting %
provided for the relay
4.4 Error in operating current %
for a set value of current.
4.5 Error in operating time for a %
set value of current.
4.6 Resetting time of the relay milli sec
4.7 VA burden of the relay VA
4.8 DC power consumption of Watt
the relay
4.9 Short time current withstand Amps
capacity of the relay for 1
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sec
4.10 Rated making & breaking Amps
capacity of contacts
4.11 Rated D.C. voltage variation
for which relay operation is
guaranteed.
Volts
4.12 Rated relay voltage for the
D.C. circuit
Volts
4.13 Rated relay current for the
D.C. circuit
Amps
5.0 Particulars of Instantaneous Over Current Relay
Units Primary Side of transformer
5.1 Manufacturer
5.2 Relay Identification number
5.3 Setting range of the relay % of 5 A
5.4 Operating time at set milli-sec
current, 2 times set current,
3 times set current & 4
times the set current.
5.5 Operating time at 5 times milli -sec
the set current
5.6 Accuracy of operating +/- milli -sec
time/Class
5.7 Resetting time of the relay milli -sec
5.8 VA burden of the relay VA
5.9 DC power consumption of Watts
the relay
5.10 Short time current carrying Amps
capacity of the relay for 1
sec
5.11 Current carrying capacity of Amps
the contacts (normal)
5.12 Current carrying capacity of Amps
the contacts (short duration
1 sec)
5.13 Rated making & breaking Amps
capacity of the contacts.
5.14 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed.
5.15 Rated relay voltage for the Volts
D.C. circuit
5.16 Rated relay current for the Amps
D.C. circuit
6.0 Transformer OCR IDMT
Units Primary Side 25 KV side
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6.1 Manufacturer
6.2 Relay Identification number
6.3 Characteristics of the relay
6.4 Current setting range % of 5 A
6.5 Time multiplier setting
range
6.6 Error in operating current %
for a set value of current.
6.7 Error in operating time for a %
set value of current.
6.8 Resetting time of the relay milli sec
6.9 VA burden of the relay VA
6.10 DC power consumption of Watts
the relay
6.11 Short time current carrying Amps
capacity of the relay for 1
sec
6.12 Rated making & breaking Amps
capacity of the contacts.
6.13 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed.
6.14 Rated relay voltage for the Volts
d.c. circuit
6.15 Rated relay current for the Amps
d.c. circuit
7.0 Earth Leakage Protection Relay
Units Primary Side 25 kV Side
7.1 Manufacturer
7.2 Relay identification number
7.3 Setting range of the relay
7.4 Operating time at 2, 3 & 4 milli sec.
times the set current
7.5 Operating time at 5 times milli sec.
the set current
7.6 Resetting time of the relay milli sec.
7.7 VA burden of the relay VA
7.8 DC power consumption of Watts
the relay
7.9 Short time current carrying Amps
capacity of the relay for one
second
7.10 Current carrying capacity of Amps
the contacts (normal)
7.11 Current carrying capacity of Amps
the contacts (short duration
1-second)
7.12 Rated making & breaking Amps
capacity of the contacts.
7.13 Rated D.C. voltage variation Volts
range for which relay
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operation is guaranteed.
7.14 Rated relay voltage for the Volts
D.C. circuit
7.15 Rated relay current for the Amps
D.C. circuit
8.0 Transformer Differential Relay
Units
8.1 Manufacturer
8.2 Relay Identification number
8.3 Range of relay setting %
provided for the relay
8.4 Current limit for which the Times of set
relay shall not operate for current
inrush currents
8.5 Error in operating current %
for a set value of current.
8.6 Error in operating time for a %
set value of current.
8.7 Resetting time of the relay milli sec
8.8 VA burden of the relay VA
8.9 DC power consumption of Watt
the relay
8.10 Short time current withstand Amps
capacity of the relay for 1
sec
8.11 Range of bias setting %
8.12 Whether the relay shall be
effective for changes in the
taps of the transformer from
–15 to +15%?
8.13 Whether relay should be
insensitive to through fault
up to 5 times the set
8.14 Whether the relay shall lock
out in case 2nd harmonic
are more than 15%
8.15 Whether suitable
interposing C.T. shall be
supplied
8.16 Rated making & breaking Amps
capacity of contacts
8.17 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
8.18 Rated relay voltage for the Volts
D.C. circuit
8.19 Rated relay current for the Amps
D.C. circuit
9.0 Inter trip Relay
Units
9.1 Manufacturer
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9.2 Relay Identification number
9.3 Operating time
9.4 Accuracy of operating time
9.5 Resetting time of the relay
9.6 DC power consumption of
the relay
9.7 Rated making & breaking Amps
capacity of contacts
9.8 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
9.9 Rated relay voltage for the Volts
D.C. circuit
9.10 Rated relay current for the Amps
D.C. circuit
10.0 Reverse power relay
Units
10.1 Manufacturer
10.2
Relay Identification
number
10.3
Setting range of the
relay
10.4 Operating time at set value milli sec 10.5 Accuracy of operating +/- milli sec
time/Class
10.6
Resetting time of the
relay milli sec 10.7 VA burden of the relay VA
CT
PT
10.8
DC power consumption of the Watts
relay 10.9 Short time current carrying Amps
capacity of
the relay for 1 sec
10.10
Current carrying capacity of Amps
the contacts
(normal)
10.11
Current carrying capacity of Amps
the contacts (short duration 1
sec)
10.12 Rated
making & breaking Amps
capacity of the contacts. 10.13 Rated D.C. voltage variation Volts
range for
whic
h relay
operation is guaranteed. 10.14 Rated relay voltage for the Volts
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D.C.
circuit 10.15 Rated relay current for the Amps
D.C.
circuit
10.16 Error in operating value
10.17 Error in operating time
11.0 Differential protection relay for 25 kV bus at TSS, SSP & SP
Units
11.1 Manufacturer
11.2
Relay Identification
number
11.3
Range of relay setting %
provided for the
relay
11.4
Error in operating current for a %
set value of current. 11.5 Error in operating time for a %
set value of current.
11.6
Resetting time of the
relay milli sec
11.7 VA burden of the relay VA
11.8
DC power consumption of the Watt
relay 11.9 Short time current withstand Amps
capacity of
the relay for 1 sec 11.10 Rated making & breaking Amps
capacity of contacts 11.11 Rated D.C. voltage variation Volts
range for whic
h relay
operation is guaranteed 11.12 Rated relay voltage for the Volts
D.C.
circuit 11.13 Rated relay current for the Amps
D.C. circuit
12.0 Directional Numerical distance protection relay with 3 zone
and polygonal characteristics
Units
12.1 Manufacturer
12.2 Relay Identification number
12.3 Setting available in relays 12.4 Range in forward & reverse Ohms/Number/
directions. (Indicate number milli sec
of zones in forward &
reverse directions with
operating time
12.5 Range and steps of each
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settable parameter as
available on the relay
12.6 Operating time of each
element.
12.7 Error in operating value and
operating time of each
element.
12.8 Resetting time of the relay of milli sec
each element
12.9 VA burden of the relay VA
12.10 DC power consumption of Watts
the relay
12.11 Short time current carrying Amps
capacity of the relay for 1 sec
12.12 Operating time for I, II, III milli sec
zone etc. range of setting of
additional time delay for
zone II & III
12.13 Whether the relay shall act
for WPC type of faults
12.14 Whether regeneration
immunity shall be provided
for the relay
12.15 Thermal withstand capability Amps
12.16 Particulars of output relay
(a) Make Amps
(b) Rating Amps
(c) NO, NC Contact Number
details
12.17 Rated making & breaking Amps
capacity of contacts
12.18 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
12.19 Rated relay voltage for the Volts
D.C. circuit
12.20 Rated relay current for the Amps
D.C. circuit
12.21 Whether 2nd harmonic
restraint features as per
clause 9.1.2(t) provided?
12.23 Whether switch on to fault
(SOTF) feature is provided?
12.24 Whether synchronous
polarization feature is
provided?
13.0 Definite minimum time over current relay with instantaneous element for
feeder protection at TSS and DTOC relay at SSP/SPs
Units
13.1
Manufacture
r
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13.2 Relay Identification number 13.3 Current setting range Amp
a) Time delay
element
b) Instantaneous
element
13.4 Time setting range
13.5
Error in operating current for a %
set value of current.
13.6
Error in operating time for a set %
value of current.
13.7
Resetting time of the
relay milli sec
13.8
VA burden of the
relay VA 13.9 DC power consumption of the Watts
relay
13.10 Short time current carryin
g Amps
capacity of the relay for 1 sec
13.11 Rated making &
breaking Amps
capacity of the contacts.
13.12 Rated D.C. voltage
variation Volts
range for which relay
operation
is
guaranteed.
13.13
Rated relay voltage for the d.c. Volts
circui
t
14.0 Vectorial Delta I Relay
Units
14.1
Manufacture
r
14.2 Rated current Amps
14.3 Setting range & steps Amps
14.4 Error in operating current
14.5 Error in operating time
14.6 setting range of ‘X’ blinder
and steps of its setting
14.7 error in operating ‘X’ value
14.8 Rated short time current for Amps
1 sec.
14.9 Rated dynamic current Amps
14.10 Operating time (a) Normal milli-sec
(b) With timer
14.11 Rated VA burden VA
14.12 Power consumption of Watts
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control circuit
14.13 Maximum arc resistance Ohm
that the relay can identify
14.14 Resetting time milli-sec
14.15 Rated current carrying Amps
capacity of contacts
14.16 Rated breaking capacity of Amps
contact
14.17 Rated making capacity of Amps
contact
14.18 Number of spare NO and Number
NC contacts
14.19 Is the relay draw out type?
14.20 Are test terminals/test
switches provided?
14.21 Have specimen calculations
for the recommended relay
setting been enclosed with
the offer ?
14.22 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
14.23 Rated relay voltage for the Volts
D.C. circuit
14.24 Rated relay current for the Amps
D.C. circuit
15.0 Panto-Flashover Protection Relay
Units
15.1
Manufacture
r
15.2 Operating time milli sec
15.3 Resetting time milli sec
15.4 Rated current carrying Amps
capacity of contacts
15.5 Rated breaking capacity of Amps
contact
15.6 Rated making capacity of Amps
contact
15.7 Number of spare
(a) NO contacts Number
(b) NC contacts Number
15.8 Is the relay draw out type or Yes/No
card mounted type
15.9 Whether relay can identify Yes/No
extended feed condition?
15.10 Rated making & breaking Amps
capacity of contacts
15.11 Rated D.C. voltage variation Volts
range for which relay
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operation is guaranteed
15.12 Rated relay voltage for the Volts
D.C. circuit
15.13 Rated relay current for the Amps
D.C. circuit
15.14 Whether the relay shall be
able to operate the
flasher/warn lights as also
the panto flashover
prevention scheme.
16.0 Logic Based Intelligent Auto recloser
Units
16.1 Manufacturer
16.2 Relay Identification number
16.3 Range of dead time milli sec
provided for the relay
16.4 Range of reclaim time Sec
provided for the relay
16.5 Whether the second reclose
facility is available and can
be switched off on ON as
per the user’s requirement
16.6 For high fault level whether Yes/No
the auto reclosure shall be Amps
bypassed. If yes what shall
be this current range
16.7 Whether only one auto Yes/No
recloser shall close when a
tripping on fault occurs.
16.8 The time after which the 2nd Sec
auto recloser shall act for
such a case as above.
16.9 VA burden of the relay VA
16.10 DC power consumption of Watts
the relay
16.11 Rated making & breaking Amps
capacity of contacts
16.12 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
16.13 Rated relay voltage for the Volts
D.C. circuit
16.14 Rated relay current for the Amps
D.C. circuit
16.15 Rated voltage Volts
17.0 Master Trip Relay
Units
17.1 Manufacturer
17.2 Relay Identification number
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17.3 Operating time milli sec
17.4 Accuracy of operating time %
17.5 Resetting time of the relay milli sec
17.6 DC power consumption of Watts
the relay
17.7 Rated voltage Volts
17.8 Rated making & breaking Amps
capacity of contacts
17.9 Rated D.C. voltage variation Volts
range for which relay
operation is guaranteed
17.10 Rated relay voltage for the Volts
D.C. circuit
17.11 Rated relay current for the Amps
D.C. circuit
18.0 Blower fan
Units
18.1 Manufacturer’s Name
18.2 Operating Voltage Volts
18.3 Power Consumption at rated Watts
voltage
18.4 Whether continuously
rated?
19.0 Space Heater
Units
19.1 Manufacturer’s Name
19.2 Operating Voltage Volts
19.3 Power Consumption at rated Watts
voltage
19.4 Whether continuously
rated?
ANNEXURE 5
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MATERIAL SCHEDULE
(To be submitted by the purchaser for tendering)
MATERIAL SCHEDULE FOR THE SECTION ____________________________
S.No Item to be provided Quantity required at
TSS SSP SP
EQUIPMENT ON THE FRONT OF THE PANEL
1.0 Set of push button switches for control of -
1.1 HV Incoming line breaker and bus coupler
breaker
1.2 Transformer breaker primary side
1.3 Transformer breaker 25 kV side
1.4 25 kV breakers & bus coupler
2.0 Switches for local/remote change over -
2.1 HV Incoming line breaker and bus coupler
breaker
2.2 Transformer breaker on HV side
2.3 Transformer breaker on 25 kV side
2.4 25 kV breakers & bus coupler
3.0 Automatic semaphore indicators for -
3.1 HV Incoming line breaker and bus coupler
breaker
3.2 Transformer breaker on HV side
3.3 Transformer breaker on 25 kV side
3.4 25 kV breakers & bus coupler
4.0 Manually operated semaphore for -
4.1 220 or 132 or 110 kV isolators
4.2 Isolators on 25 kV side
5.0 Set of Red & Green indication LEDs
for close and open positions of -
5.1 HV Incoming line breaker and bus coupler
breaker
5.2 Transformer breaker on HV side
5.3 Breakers for transmission line
sectioning arrangement.
5.4 Transformer breaker on 25 kV side
5.5 25 kV breakers & bus coupler
6.0 Set of push button and annunciation
LEDs for -
6.1 Trip circuit of CB fail (Yellow LED)
6.1.1 HV Incoming line breaker
6.1.2 Transformer breaker on primary side
6.1.3 Transformer breaker on 25 kV side
6.1.4 25 kV feeder breakers
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S.No Item to be provided Quantity required at
TSS SSP SP
6.2 D.C. supply fail for control/alarm and
annunciation circuit (yellow LED)
6.3 OHE supply/PT fuse fail (Red LED)
7.0 No. of blue indication LEDs for the blower
fans of each transformer -
8.0 A.C. Ammeters on 25 kV side, Scale 0-
600/1200 Amps with associated range selector
switch
9.0 A.C. Voltmeter on 25 kV side, Scale 0-30 kV
10.0 A.C. Ammeters Scale 0-200/400 Amps for
220/132/110 kV system.
11.0 A.C. Voltmeter for 220 kV or 132 kV or 100
kV system, Scale 0-260 kV or 0-160 kV or 0-
150 kV.
12.0 Annunciation system comprising -
12.1 No. of LEDs for annunciation
12.2 No. of columns of LEDs
12.3 No. of rows of LEDs
12.4 Annunciation alarm accept push button
12.5 Annunciation alarm re-set push button
12.6 Annunciation testing push button
12.7 D.C. bell operated off 110 V
(to be mounted inside)
13.0 110 V D.C. supply supervision and
annunciation scheme thereof -
13.1 Push button for DC fail alarm test
13.2 Push button for DC fail alarm accept
13.3 Indication LEDs (yellow) for DC fail
indication (240 V a.c)
13.4 A.C (240V) hooter for DC supply fail alarm
14.0 Cut off switches for disconnection of
14.1 110V DC supply to alarm and indication
circuits
14.2 240V AC supply to AC hooter and DC fail
indication lamps
15.0 Test switches & test terminal block for use
with external meters 16.0 Any other item(s) considered necessary by the
purchaser or recommended by the tenderer for
meeting the requirement of scheme
EQUIPMENT INSIDE THE CONTROL PANEL
1.0 Space heaters with switches (240 V A.C)
2.0 Blower fan with switches (240 V A.C)
3.0 240 V, 5 A, 3-pin socket & switch
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S.No Item to be provided Quantity required at
TSS SSP SP
4.0 Cubicle illumination incandescent lamp with
two door switches
5.0 Corridor illumination incandescent lamp with
two door switches 6.0 Terminal blocks 7.0 HRC or rewirable fuses and links 8.0 Earth links 9.0 Any other items considered necessary
EQUIPMENT ON THE REAR OF THE PANEL (RELAY PANEL) 1.0 For the protection of transformer
1.1 Differential relay 1.2 IDMT over current relay on the primary side 1.3 Instantaneous over current relay on the primary
side 1.4 Instantaneous earth fault relay on the primary
side 1.5 IDMT over current relay on the 25kV side 1.6 High speed inter tripping relay (hand reset
contacts) 1.7 Lockout relay (if provided) separately 1.8 Aux. Relays for transformer fault i.e. Buchholz,
excessive winding and oil temperature tripping 1.9 Aux. Relays for transformer alarm i.e.
Buchholz, excessive winding, oil temperature
and low oil level alarm. 1.10 Interposing CTs for provision in differential
protection circuit (to be mounted inside). 2.0 For the protection of OHE -
2.1 Polygonal characteristics 3 zone time graded
distance protection with wrong phase coupling.
2.2 Directional definite time OCR with
instantaneous element 2.3 Directional definite time OCR at SSP/SP 2.4 High speed tripping relays (master trip relay) 2.5 Panto flash over protection relay at
TSS/SSP/SP* as per clause
(a) 9.8.5
(b) 9.8.6 2.6 Delta-I type fault selective relay 2.7 Logic based intelligent auto-recloser
3.0 Details for protection of capacitor bank
equipment (optional) -
* Note: Detailed requirement for its provision, communication media etc shall be given
in the tender as optional.
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Draft SPECIFICATION NO.
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S.No Item to be provided Quantity required at
TSS SSP SP
4.0 Relays for annunciation and D.C. supervision
scheme
4.1 A set of aux. Relay necessary for annunciation
(such as annunciation relay, flasher and bell
relay etc.)
4.2 Aux. relay for d.c. supply supervision
4.3 Aux. Relay for d.c. fail alarm cancellation
4.4 Any other item(s) considered necessary by the
purchaser or recommended by the tenderer for
meeting the requirements of the scheme.
5.0 Test blocks with test plugs for testing the
relays covered above against 1.0, 2.0, 3.0, 4.0,
5.0 & 6.0.
6.0 Notebook laptop Computer (Intel M 750
Centrino based 512MB DDR, 80GB,
CD/DVD/RW 14.1” TFT or latest) with
required latest version of softwares/ waveform
analyzing software with safe carrying cases.
7.0 Latest HP DeskJet portable printer for printing
the waveform data
8.0 Provision of fault locator in the relay.
9.0 Differential biased bus bar protections relay on
HV side
10.0 High impedance type differential protection
relay for bus bar on 25 kV side
11.0 Reverse power relay
111008/2020/O/o PED/TI/RDSO426
Draft SPECIFICATION NO.
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Annexure-6
111008/2020/O/o PED/TI/RDSO427
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Annexure-7 (Sheet 1of 3)
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Draft SPECIFICATION NO.
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Annexure-7 (Sheet 2of 3)
111008/2020/O/o PED/TI/RDSO429
Draft SPECIFICATION NO.
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