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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 equipmentg) 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
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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
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tTrT::Idl DAKSBINIIAlO'ANA BIJU lfI'rRAN .sI6IdI
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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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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uTTAIt DAKSlfIl( BAIO.'ANA ULlLI Y'rntAN NItiAM
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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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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