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UTrAI{ DAKSIiIN HAln'AfiA BLlU V'rrRA.N NIGAM
Specification No. CSC-XX-R-II/DH/UH/P&D/2011-2012
TECHNICAL SPECIFICATION
FOR
33 KV Control & Realy Panel
Common Specifications CommitteeUHBVN & DHBVN
Issue Morath: March 2012. ,(CSC approval date 26.09.2011)
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"TECHNICAL SPECIFICATION OF INDEPENDENT 33KV TRANSORMER AND FEEDERCONTROL AND RELAY PANELS FOR 33KV SUB STATION & FOR GROUP CONTROL OF2 Nos. OF 33!11 KV TRANSFORMERS
1. SCOPE:
The specification covers the design manufacture, testing before dispatch, supply &
delivery along with associated sundries to complete the job. A control and relay panel shall
include the following:
a) Protective and auxiliary relays required for the protection of transformers and lines.
b) Indicating instruments with necessary switches
c) Control switch for the remote control of 33 KV circuit breaker.. '.
- d) Supervision equipment
e) Mimic equipment
o Alarm equipment
g) Terminals, wiring ferrules, fuses, links and sundries to complete the job.
2. STANQARDS:
All material and equipment shall comply in every respect with the requirements of the .
latest edition of the relevant standards as specified here. Equipment meeting with any other
internationally recognised standards will be acceptable.
Protective relays IS: 3231
Indicating Instruments IS: 1248
Mimic colour shades IS: 1961
3. CLIMATIC CONDITIONS~The equipment/material to be supplied against this specification shall be suitable
for satisfactory operation under the following climatic Conditions
i) Location At various locations in the stateof Harvana
ii)- Max ambient temperature (deq.c) - 60iii) Min ambient air temperature (deg. c) ·--5iv) Max average daily ambient temperature (deq. c) 40v) ·/Max. yearly weighed average ambient 32
temperature (deQ. C) .vi) Max. altitude above mean sea level (Meters) 1000vii) Minimum Relative Humidity (%age ) 26viii) Max. Relative Humidity (%age) 95ix) AVQ. no of Rainy days! year 120x) AVQ. annual rainfall
,900mm
xi) Maximum wind pressure 195 KQ.lmm Sq.The equipment shall be for use in moderately hot and humid tropical climate, conducive to rustand fungus growth.C \Docl1JncnlsAncl Sdtings\Administralor\Desklop\Specificatioo\cSC-XX-R.J Doc Page 2 of 16
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4. SYSTEM PARTICULARS AND AUXILIARY SUPPLIES:
4.1 33KV voltage supply will be 3 phase, 50 Hz.
4.2 Wherever the neutral is provided on the power transformer, the same will be solidly
earthed.
4.3 A.C. supply at the 33KV sub-station for which the C&R panels against this
specification are required will be415/240 Volts, 3 phase, 4wire, 50Hz:!:3% variation.
4.4 D.C. supply available at the sub stations for which the C&R panel against this
specification are required will be 24 Volts, 2 wire available from the sub-station battery.
The supply may have 2: 10% variation:
5. TEST SHEETS:
Guaranteed test sheets as per Annexure 'A' will be submitted by the tenderer alongwith
the tender. Relevant literature will be supplied for proper appreciation of the offered
equipment.
6. SPARE PARTS:
The cost of the following items may" be quoted separately so that: the same be
purchased as spares, if considered necessary.
6.1 Triple pole IDMTL type over current relay with instantaneous attachments, non-
directional combined over current and earth fault relay, auxiliary relays (used in the
alarm scheme) semaphore relays used.on the panel.
6.2 Control handle used on the panel for the remote control of circuit breake.r.
6.3 Ammeter & Voltmeterused on the panel:
6.4 INDICATING LAMPS, BELL BUZZER:
At list of spare parts recommended for 5 years of normal operation shall be furnished
with the tender. Actual quantities to be ordered shall be determined by the purchaser.
7. DEPARTURE FROM SPECIFICATION:
Sh~uld the tenderer wishes to depart from the provision of this specification either on
account of manufacturing practice or for any other reason, he will draw special attention to the
proposed points of departure in his tender and submit such full information, drawing and
specifications as will enable the merit of his proposal to be appreciated.
In the event of supplier's drawings, specifications and tables etc., disagreeing with this
specification during the execution of contract, this specification shall be held binding unless the
departures have been fully recorded and agreed upon by purchaser as required above.
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8. DRAWING:In addition to any other drawings which the tenderer may like to enclose to explain the
merits of his proposal, the following drawings shall be enclosed with the tender in quadruplicate:
i) Major dimensional drawing of each of the three types of C & R panel.
ii) Feeder circuit protection scheme.
iii) Transformer circuit protection scheme in respect of both types of transformers C &R
panel.
Within 15days after the date of issue of firm order together with other essential technical
particulars( by the purchaser), the supplier shall furnish 4 copies each of the
dimensional drawings, schematic drawings and wiring drawings of C&R panels for.
purchaser's approval, enabling him to determine that the design proposed can be
satisfactorily fabricated. The purchaser shall have the right to require the supplier to
make any other change in the design, which may be necessary in his opinion to make
. the equipment conform to the stated provisions of the specification without additional~- .cost tQJhe purchaser. Approval by the purchaser of the supplier's drawings shall not be
held to relieve the supplier of any part of the contract ebligation to meet all the
requirements of this specification. .
9. ILLUSTRATEDAND PRINTEDLITERATURE:
Two copies each of the descriptive and printed literature in respect of al.1instruments
switches and relays used on the offer~d.panels shall be supplied alongwith the tender.
10. PLACE OF MANUFACTURE& INSPECTION:
The tenderer shall state in his tender the place(s) of manufacture, testing and inspection
of the various portions of the work included in the tender,
The purchaser or his duly authorized agency shall have access to the supplier's works
at any time during working hours for the purpose of inspecting the manufacture of material,
equipment etc., and the supplier shall provide the necessary facilities for inspection.
11. TESTS:
The following tests shall be carried out at the manufacturer's works after complete
assemble of control and relay panel board and the test report of such tests supplied in
quadruplicate for approval of CGM/MM, DHBVN I UHBVN before despatch of equipment: -
i) Checking of wiring circuits and their continuity.
ii) , One minute applied voltage test for all equipment on panels and wiring.
iii) Insulation resistance of complete wiring, circuit by circuit with all equipments
mounted on the panel.
iv) Checking the operation of protective relays.C\Documents And SeltmgMdministrator\DesktoplSpecific.:Jlion'CSC.XX.R.[ Doc Page 4 of 16
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All instruments, auxiliary relays and protective relays used on the panels shall comply
with the latest edition of relevant Indian/Other internationally acceptable standards and routine
test certificates for the same supplied and got approved from the purchaser.
Type test reports relating to all protective relays as per relevant standards shall be
submitted by the tenderers alongwith their tender for reference of the purchaser.
The type test reports should not be more than five years old reckoned from the date of
bid opening. The type tests should be got carried out from the Govt./Govt. approved NABL
accredited test house as per relevant ISS.
Immediately after finalisation of the programme of acceptance/routine testing, the
supplier shall give sufficient advance intimalion (at least 15 days notice for Indians suppliers and
30 days notice for Foreign supplier) to the purchaser to enable him to depute his representative
for Witnessingthe tests.
12. FAKEINSPECTION CALL
The manufacturer shall be responsible to pay penalty of -Rs 20,0007- for each
occasion at which the fake inspection call hasbeen made or the material is rejected during
testing/inspection by the authorized agency/representative of the Nigam. This penalty would
be in addition to the expenses incurred by the Nigam in deputing the Inspecting Officer,
carrying out such inspection
13. INSTRUCTION BOOKLETS:
Operating, testing, commissioning and maintenance instructions in English.language
covering all the protective and auxiliary relays and instrumenisshall be put under a common
cover and six such sets shall be supplied free of cost at least one month before despatch of the
C&R panel.
13. REPRODUCIBLEDRAWINGS:The supplier shall supply one set of full size reproducible of dimensional drawings,
schernalicdrawinqs and wiring diagrams of the three types of control and relay panels against
the contract either on tracing cloth or on synthetic paper enabling easy multiplication of prints as
and when required by the purchaser. The supplier will also supply six sets of drawings for each
type of C&R panels, each set consisting of dimensional schematic and wiring diagrams of the
panels.
14. PACKING AND TRANSPORT:The supplier shall be responsible for suitable packing of all the material and marking on
the consignment so as to avoid any damage during the transport and storage and to ensure
correct despatch to the destination.
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15. MARKING:The following particulars shall be marked distinctly and permanently on every relay
preferably in a position visible from the front.
(a) Manufacturers name or the make by which he may be identified.
(b) Manufacturer's type reference.
(c) Ratedcurrent, rated voltage or both.
(d) Frequency.
(e) Particularsof auxiliary equipment.
(f) Setting indication.
(9) Manufacturer's serial Number.
(h) Countryof manufacture.-
Relays must be marked with ISI certification mark.
Meters shall have markings as per ISS 1248-1983 or latest version thereof/equivalent
IEC.
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PART-II TECHNICAL PARTICULARS
1. GENERAL DESCRIPTION OF CONTROL & RELAY PANEL:The control and relay panel shall consist of separate cubicle with side covers made of
sheet steel and complete with internal wiring, terminals, ferrules and illumination with door
operated 'OFF' and 'ON' switch. The cubicle shall be suitable for floor mounting with its bottom
open and shall be completely dust and vermin proof. The cubicle shall be of suitable height with
adequate depth and width so as to afford comfortable working area inside the panel for testing
staff. Each cubicle shall be fitted with flush mounted steel hinged door and lock at the back and
all the equipments (control, supervisory, metering and protective) will be mounted in front. The
supply shall include the channel base, suitable grouting bolts, nuts, locknuts, washers etc.
alongwith the panels.
The individual panels shall have provision for extension at both ends so as to form a
board as per the requirement.
SUPERVISION SCHEME:Each of the control and relay panel against the specification shall be fitted with the
following supervision lamps: -
Circuit breaker close:Circuit breaker open:Auto-trip:Trip circuit healthy:(Monitor~g both whenBreaker IS OFF/ON)All lamps except circuit breaker close and circuit breaker open indicating lamps shall berated for 24 volt D.C. The lamps shall have low wattage consumption and shall provide acomfortable viewing.Circuit breaker close and circuit breaker open indication lamps will be suitable for 220VAC. Glass/plastic lens of appropriate colour shall be screwed into the front of the lamp.toov.An engraved label indicating the purpose of the lamp shall be provided with each lamp.
. .ln the initial supply 20% of the lamps actually used on the switch board and 10% of lamplenses of various colours shall be supplied loose to serve as spares.ALARM SCHEME:
2.
Red.Green.Amber.White.
3.
a) Alarm scheme for trip alarm due to electrical faults:Trip commands due to operation of protective relays including Buchholz relay and
winding temperature trip contacts will actuate bell and will be cancelled by the circuit
breaker control handle. Auto trip lamp will glow on the panel and there will be flag
indication on the concerned protective relay/auxiliary relay of the panel.
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b) Alarm scheme for non trip alarm:This scheme will conform to the following:i) The closing of an initiating contact shall actuate a buzzer and will be
accompanied by a flag indication on the concerned auxiliary relay.
ii) The closing of an initiating contact shall glow a lamp, which will not reset until the
fault has cleared.
iii) It shall be possible to silence the buzzer by pressing 'accept' push button,. If
after canceling the alarm but before resetting thevisuat signal, the same fault
persists the buzzer shall be suppressed.
iv) If after canceling the alarm but before resetting the visual signal some other fault
takes place then the alarm accompanied by the flag indication on the concemed
auxiliary relay shall take place.
v) If after canceling the alarm and after resetting the visual signal, the same fauit
reappears or some other fault takes place, the alarm flag indication and non-trip
lamp indication shall reappear as usual:
vi) The non-trip alarm. acceptance shall be by means of a push button and resetting
.ot visual signal may also be done through a push button.
vii) Means shall be provided for test checking the alarm and lamp circuits.
viii) The equipment shall be suitable for 24 D.C. operation.
3.1 Four ways for the annunciation of non-trip alarm on transformer panels with the following
description shall be provided:
TRASFORMER PANELS:
1) .Buchholz alarm-._-
2) Winding temperature alarm
3) Oil temperature alarm
4) OLTC oil surge relay & low oilalarm
3.2 Four ways for annunciation of trip & alarm on TIF panels with following description shall
.be provided:
I) Buchholz trip
2) Winding temperature trip
3) Oil temperature trip.
4) OLTC oil surge relay trip.
N.B.: 33 kV transformer panels meant for the group control of 2 Nos. 33/11 kV transformers
shall be provided with necessary auxiliary relays for independent annunciation of the non-trip
alarms (such as Buchhloz's alarm, winding temperature & Oil temperature alarm, OLTC Oil
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surge relay & Low Oil alarm etc)., trip (such as Buchhloz's trip, winding temperature, Oil
temperature trip & OLTC Oil surge relay trip etc.) conditions of transformer.
4. MIMIC SCHEME:4.1 Suitably painted mimic diagram will be reproduced on the panels. Automatic semaphore
indication for indicating OPEN and CLOSE position of circuit breakers, isolators and
earth switches shall be suitably incorporated in the mimic diagram as per Sketch-
I(enclosed). The operating coil of the semaphore relays shall be suitable for use on
24VD.C.
4.1 Following colour scheme shall be used for mimic representation on the panels against
this specification:
Vottaqe panel Colour Shade No. (accordinq to ISS-1961)33KV Brilliant green 22111KV Sional 537
5. METERING SCHEME:
. Voltmeters & Ammeters on all_the panels against the specification shall be of square,
flush mounting type. The line panels shall be mounted with both voltmeter & ammeter,
. whereas the transformer panel shall have only the ammeter. . . .
5.1 . Voltmeter shall be accompanied by a suitable selector switch facilitating the·
measurement of voltage between phase to phase and between phase to neutral.. The
voltmeter coil shall be rated for 110 Volts between phase to phase obtainable from the
secondary of potential transformers. The instrument shall be of moving iron spring
controlled type grade 'A' classification with an accuracy class of 1 and shall conform to
IS: 1248- 1983, IS:2419-1963 (latest version there of) or relevant BIS, IEC or ASA
standard.
5.2.1 Suitably sealed ammeter to cover CTs ratio shown in sketch-I shall be accompanied by
a selector switch facilitating the rneasurementof phase currents as well as the
unbalanceq current in the neutral. The ammeter coil shall be rated for 5 Amp. The
instrument shall be of moving iron spring controlled type of industrial grade 'A'
classification with an accuracy class 1 and shaHconform to IS: 1248-1983, IS: 2419-
1963 (latest versionthereof) or relevant BIS/I.E.C or ASA standard
6. CONTROL SCHEME AND CONTROL SWITCHES:It shall be possible to close the breaker from the control room. For this purpose control
switches with built in key free locks having pistol grip type or handles of the spring return to
neutral position type with alarm (cancellation) contacts shall be provided for operation of circuit
breakers.
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7. PROTECTION SCHEME:7.1 TRANSFORMER PANELS:
Triple pole over current relay IDMTL type with high set elements For Over Current
protection a triple pole inverse definite minimum time lag over Current relay with a setting range of 50%-
200% (of 5Amp Rating) and also fitted with high set elements of 500%-2000% of 5A for instantaneous
clearance of faults within the transformer(s) shall be provided on each of the transformer control and
relay panel.
For restricted earthfault protection to 33KV winding of the power transformer, an
instantaneous balanced earth fault relay shall be provided on each of the transformer C& R panel.
The relay shall have a setting range of 10%-40% of 5Amp. & shall be complete with 50Hz circuit &
stabilizing resistance.
Note:
R.E.F. protection is not required for the transformer having capacity 5 MVA & below.
7.2 LINE PANEL:Triple pole combined over current and earth fault relay:-Triple pole combined over current and earth fault relay consisting of outer two over current
elements having setting range 50% to 200% of 5Amp having IDMTL characteristics and inner earth fault
element having setting range of 20-80% of 5Amp having IDMTL characteristic shall be provided on
. each of the 33KV line panel.
7.3· TRANSFORMER DIFFERENTIAL PROTECTIOIN (For Capacity 10 MVA & above):The relay shall
i) Be triple pole numerical type.
ii) Have 3 instantaneous high set differential units.
iii) .Have second harmonic restraint or other inrush proof feature and be stable under normal
. over fluxing condition.
iv) Have fifth harmonic by pass filter or similar other arrangement to prevent mal-operation of
the relay under operating conditions.
v) Be suitable for rated current of 5A and include necessary ICTs for ratio & phase angle
correction.
vi) Have operating current setting sufficiently low (15% or less) so as to cover practically the
whole of the transformer against all types otfaults.
vii) Have adjustable bias setting range of 20-50%. Have maximum operating time of 30milli
seconds at 5 items the rated current.
viii) Be provided with necessary terminal & links to measure current in restraining circuits & in
the operating circuits of all the phases under load without making any wiring changes.
ix) Display.resolution of differential/pickup current should be 0.01A (10 MA).
8. SMALL WIRING:
8.1 All the wiring shall be of switchboard type consisting of single tinned annealed copper
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conductor insulated with polyvinyl chloride insulation suitable for 660 volts service and in
accordance with IS: 732-1963 (latest version thereof).
8.2 The wiring of the following circuits shall be not less than the size specified below:
CTs and PTs circuits: 2.5 mm sq
Control alarm, supervision circuits: 1.5 mm sq.8.3 All wires will be continuous from one terminal to the other and also will have no tee- junction
enroute. At the terminal connections, washers shall be interposed between terminals and
holding nuts. All holding nuts shall be secured by locking nuts.
8.4 Bus wires shall be fully insulated and run separately. Fuses and links shall be provided to
enable all the circuits in a panel to be isolated from the bus wire. Wherever practicable all
circuits in which the voltage exceeds 125 volts shall be kept physically separated from the
remaining wiring. The function of each circuit shall be marked on the associated terminal
board.
8.5 All wiring diagrams for the control and relay panel shall be drawn as viewed from the back of
. the cubicle and shall be in accordance witl+..lSS;. 375-1963 (latest version thereof). Multicore
cable tails shall be so bound to its cable that each wire may be traced without difficulty.
9 TERMINAL BOARDS:9.1 Terminals block connectors built from cells of moulded dielectric and brass stud inserts shall
be provided for terminating the outgoing ends .of the panel wiring and the corresponding
tail ends of Control Cables. Insulating barriers shall be provided between adjacent connections.
The height of barriers and spacing between terminals shall be such as to give adequate
.protection while allowing easy access to terminals.
9.2 Terminal blocks shall be suitable for 660 Volts service and for connection with both
copper and aluminum wires.
10. CONTROL AND RELAY CUBICLES
i) The Control and Relay Cubicles shall be made of Sheet Steel of thickness not less than 10
SWG (3.251 mm) for the base frame, door frame, front & Rear portions of Cubicle & not less
than 14 SWG (2.032 rnrn) for doors, side.fop & bottom portions, in place of sheet metal of 2
rnm thickness.
ii) The main REF and differential relays should only be of make AREVA ! ABB ! SIEMENS!
EASUN REYROLLE. However, the Auxiliary and 2 Nos. Over Current + Earth Faulty relays
may be of JVS make, but the same should be numerical type.
iii) The C&R Panels should be of standard-dimensions as under:-
Depth =Height of switch Board above base frame =Height of base frame =
610 mm.
2210 mm.
102 mm.
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11. FERRULES, SPACE HEATERS AND SAFETY EARTHING:
11.1 Ferrules engraved with some number and letters as indicated in the connection and wiring
diagram shall be provided on the terminal ends of all wires for easy identification of circuits
for inspection and maintenance.
11.2 Tubular space heaters suitable for connection to the single phase 230 Volts A.C. supply
complete with switches shall be provided at the bottom of each control and relay panel to
prevent condensation of moisture.
11.3 Earthing of current free metallic parts or metallic bodies of the equipment mounted on the
switchboard shall be done with copper conductor of suitable size.
12. CHALLENGE CLAUSE
The material offered/received after the inspection by the authorized inspecting officer may
again be subjected to the test for losses or any other parameter from any Testing House/in-
house technique of the NiqarnS the results if found deviating un-acceptable or not complying to
approved GTP's the bidder shall arrange to supply the replacement within thirty (30) days of
such detection at his cost including to & fro transportation. In addition to this penalty @10% of
cost of the inspected lot of material shall be imposed.
13. ~WARRANTEE PERIOD
The supplier shall be responsible to. replace, free of cost, with no transportation or
insurance cost to the Purchaser, up to destination, the whole or any part of the material which in
normal and proper use proves the defective in quality or workmanship; subject to the condition
that the defect is noticed within 1.8 months from the date of receipt of material in stores or 12
months from the date of commissioning whichever period may expire earlier. The consignee or.
any other officer of Nigam actually using the material will give prompt notice of each such defect
to the supplier. The replacement shall be effected by the supplier within a reasonable time, but
not, in any case, exceeding 45 days. The supplier shall, also, arrange to remove the defective
within a reasonable period, but not exceeding 45 days from the date of issue of notice in respect
thereof, failing which, the purchaser reserve the right to dispose of defective material in any
manner considered fit by him (Purchaser), at the sole risk and cost of the supplier. . Any sale
proceeds of the defective material after meeting the expenses incurred on its custody, disposal
handlmq.etc., shall however-be credited to the-supplier'saccount and set off against any
outstanding dues of the purchaser against the supplier. The warranty for 12/18 months shall be
one time
GM I(P&O) GM (PO)Member Secy DHBVNUHBVN
FA & CAO FA & CAO CGM(MM) (MM) (PO&C)UHBVN OHBVN UHBVN
CE (PO)DHBVN
Director(Projects)DHBVN
Director(Projects)UHBVN
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rad~OI Potaldt
PART III
PANEL DETAILS
A. TRANSFORMER PANLES:
I. Protection scheme as per para 7.1
II. A multi contact auxiliary relay suitable for 24 V D.C. for inters tripping purposes ..
III. The provision of supervision scheme, alarm scheme, mimic scheme, metering scheme andcontrol scheme on this panel shall conform to applicable items of paras 2,3,4,5, & 6respectively.
B LINE PANEL:
I. Protection scheme as per para 7.2
II. -T1re=provision of supervision scheme, alarm scheme, mimic scheme, metering and controlscheme on this panel shall conform to applicable items of pares 2,3,4,5 & 6 respectively.
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ANNEXUR-'A'GUARANTEED TECHNICAL PARTICULARS OF 33 KV TRASFORMER AND FEEDER CONTROLAND RELAY PANEL & FOR GROUP CONTROL OF 2 Nos. OF 33/11 KV TRANSFORMERS.
I. Indicating instruments:1. Make
2. Type
3. Size
4. VA burden
a) Current Coil
b) Potential Coil
5. Power consumption
a) Current Coil
b) Potential coil
6. IS standard grade of accuracy
7. Range of dial
8. Limits of error in effective range
9. Calibration for
a) CT ratio
b) PT ratio
10. Finish
11. Short time overloads capacity.
12. Descriptive leaflet reference Nos. submitted.
13. Type & make of selector.switch for ammeter.II Circuit breaker control switches:
1. Make:
2. Type:
3. Type of handle provided:
4. No. of position:
5. No. of contacts.
a) Normally closed
b) Normally opened.
6. Whether spring return to neutral or stay put type?
7. Type of lock provided.
8. Descriptive leaflet number submitted.
III. Semaphore indicator (for circuit breaker, isolator & earth switch)
1. Make
2. Type
3. Diameter of the disc.
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"4. Operating voltage
5. Burden
6. Whether latch-in type or supply failure type.
7. Descriptive leaflet number submitted.IV. Indicating Lamps:
1 Make
2 Type
3 Operating voltage.
4 Size of lens.
5 Wattage of the lamp.
6 Descriptive leaflet number submitted.V _ Switch Board Wiring
1 Insulation of wiring.
2 Wiring conductor size and its material. 3 Size of wiring conductor for:
a. CT circuits.
b. PT circuits.
c. D.C. supply circuits.
d. Other circuits.
4 Size of earthing bar for safety-earthing.
5 Type of terminals used in wiring the panel.VI Over Current & earth fault relay:
Make.
2 Type. of relay.
3. Current-coil rating.
3. Tap. range.
4. Range of high set elements (wherever applicable)
6. VA burden:
a. At highest Tap.
b. At lowest Tap.
7 Trip contact rating.
8 Descriptive leaflet Nos. submitted.VII Auxiliary Relays:
1. Make.
2. Type.
3. Capacity of co~tacts
a. Continuously.
b. For 3 seconds.
4. Operating coil VA burden.
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5 Voltage operated or current operated.
6. Number of normally open contacts.
7. Number of normally closed contacts.
8. Contacts hand or self reset type.
9. Descriptive leaflet number submitted.VIII. Restricted Earth Fault Relay:
1. Make
2. Type of relay.
3. Current coil rating.
4. Setting range
5. VA burden:
.. ' " a. At highest tap
b. At lowest tap
6. Descriptive leaflet number submitted.IX. TRANSFORMER DIFFERENTIAL RELAY.
1. Make.
2. Type.
3. Minimum differential current at which relay operations.
4. Range & steps of bias setting.
5. Operating time at twice the relay setting.
6. VA burden ofthe relay.
7. Descriptive leaflet No.
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