ASSAMELECTRICITYGRIDCORPORATIONLIMITED

PRECOMMISSIONINGOFTRANSFORMER

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

TransformerBAYNO: EQUIPMENTIDENTIFICATIONNO:
DATEOFTESTING:

TransformerType: 2Winding ICT

Voltagelevel,kV 132/33 220/132 220/132/11 400/220/33

Current(HVside): Current(LVside): Current(Tertiary):

MVARTING:

A. CHECKLISTOFELECTRICALTESTSCARRIEDOUTFORTRANSFORMER

Performed TestResults
Sl.No NameofTests (Yes/No) OK/NotOK
1 Insulationresistancemeasurement
2 Vectorgrouptest&polaritycheck
3 Shortcircuitimpedancetest
4 Magneticbalancetest
5 Floatingneutralvoltagemeasurement
6 Magnetisationcurrenttest
7 Voltageratiotest
8 InsulationresistancemeasurementsofbushingCT
9 ContinuityTestofBushingCTs
10 SecondarywindingresistanceofbushingCT
11 PolarityTestofBushingCTs
12 CurrentRatiotest
13 Magnetisingcurvesperformance
14 ContactResistancemeasurement
15 TANDELTA&CAPACITANCEMeasurementofBushings
16 TANDELTA&CAPACITANCEMeasurementof
WINDINGS
17 Protectionandalarmtests
18 StabilitytestofDifferentialandREFprotection
19 FrequencyResponseAnalysis
20 MeasurementofWindingResistance

Page1of72

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

B. CHECKS AFTER RECEIPT OF TRANSFORMER AT SITE:

a. N2 PRESSURE & DEW POINT RECORD

Description N2Pressure DewPoint AmbientTemp Remarks

DuringDispatch
atfactory
Afterreceiptat
site
DURING STORAGE
AT SITE BEFORE
COMM.

NOTE: N2 pressure and dew point should be within permissible range as per graph provided by
manufacturer. During storage at site, dew point has to be measured whenever any drop in N2
pressureisobserved.Duringstorageatsitebeforecommissioning,N2pressurehastobemeasured
dailyandrecordtobemaintainedinaseparatesheet.

b.IMPACTRECORERANALYSIS

RECEIVEDIN STATUS BRIEFANALYSIS

HEALTHY Yes No
CONDITIONATSITE
Analysisreport Yes No
Receivedfrom
Manufacturer
Before starting of
erection

Note: Impact Recorder should be detached from the Transformer/ Reactor preferably when the
mainunithasbeenplacedonitsfoundation.

c.COREINSULATIONCHECK

INSULATIONVALUE
BetweenCCG
BetweenCLG
BetweenCCCL
(Recommendedvalue>10MOhms)'

Note:ShortinglinkbetweenCC,CL&GtoberemovedandIRvaluetobetakenbetweenCCG,CLG
&CCCL.

Page2of72

C.CHECKS/PRECAUTIONSDURINGERECTION

i)Activepartoftransformershouldminimumexposedtoatmosphere

ii)Duringexposureofactivepartoftransformertoatmosphere:

DRY AIR GENERATOR/ Yes No Remarks

DRY AIR CYLINDERS
USED:

iii)WHILEENTERINGINTRANSFORMERTANK,CHECKAVAILABILITYOFPROPEROXYGEN

TRANSFORMER KEPT Yes No Remarks

SEALED WITH N2 IN
BETWEEN DIFFERENT
ERECTION
ACTIVITIES

D.PRECOMMISSIONINGCHECKS:

Sl DESCRIPTION STATUS REMARKS

No Yes No RECORDDEFICIENCIES,IFANY
1. Transformer and its auxiliaries are free
from visible defects on physical
inspection
2. All fittings as per out line general
arrangementdrawing.
3. Checkmaintankhasbeenprovidedwith
doubleearthing
4. Check neutral is grounded through
separate connections. Ensure metallic
requirements as per specification in
earthingstripsused
5. CheckthatMarshallingbox,OLTCdriving
gear, Diverter, Radiator bank, Pump &
Fanmotoretchasbeenearthed
6. Allnutsandboltsaretightenedcorrectly
as per specified torque (as per
manufacturersrecommendation)
7. Checktightnessofterminalconnectors
8. Check levelling of transformer and its
accessories
9. Erectioncompletioncertificatealongwith
listofoutstandingactivitiesreviewed
10. Any paint removed / scratched in transit
hasbeentouchedup
11. Bushingsarecleanandfreefromphysical
damages
12. Oilleveliscorrectonallbushings

Page3of72

13. Check hermetically sealing is intact in all

bushings
14. Check oil leakage through any joints /
valvesetc.
15. Checkoildrainvalvesareproperlyclosed
andlocked.
16. Check oil level in Main / OLTC
conservatortank
17. Check oil level at conservator matches
withoiltemperatureoftransformer
18. CheckgearboxoillevelinOLTC
19. CheckOTIandWTIpocketsandreplenish
theoil,ifrequired
20. check all valves for their opening &
closingsequence
21. Check the colour of breather silica gel (
bluewhendry)
22. Check availability of oil in the breather
cup
23. Check all rollers are locked and tack
weldedwithrails(whereeverapplicable
)
24. Checkbushingtesttapisgrounded
25. Check no debris , loose T & P and oil
strainsonandaroundthetransformer
26. Check door seals of marshalling box is
intact and all cable gland plates unused
holesaresealed
27. Check that pressure relief valve is
correctlymounted
28. Ensure unused secondary cores of
bushingCT's,ifany,hasbeenshorted
29. Check star point has been formed
properlyandgroundedatoneendonlyas
perscheme
30. Check that permanent and adequate
lightningarrangementsareready
31. Check that labelling and identification is
permanentandsatisfactory
32. Check that buchholz relay is correctly
mounted with arrow pointing towards
conservator
33. Check cables are properly fixed and
ensurecableentryatthebottom
34. Ensure all power and control cable
terminalsaretightened
35. Checkallcablesandferrulesareprovided
withnumberaspercableschedule(cross
ferulingtobeChecked)
36. Check that all cables are correctly
glanded

Page4of72

37. Checkexternalcablingfromjunctionbox
torelay/controlpanelcompleted
38. Checkthatairhasbeenreleasedfromthe
radiators and their headers / OLTC
buchholz relay /Main tank / tank/
bushingturretsetc.
39. Checkfireprotectionsystem&is
adequate&ready
40. CheckthatCCCL&Gareshorted
41. Checkthatallradiatorbankvalvesontop
andbottomheadersareopen
42. Changeoveroperationofacsupplyfrom
SourceitoSourceiichecked
43. Checktheflangesofbushing&
OLTCforanycrackafterfixing
44. Check various interlocks provided with
firefightingaspertheschematicref.Drg
no:__________

DESCRIPTIONOFINTERLOCKS CHECKED

E.MEASUREMENT OF EARTH RESISTANCE OF ELECTRODE

LOCATION 1 2 3 4
VALUE (Before connection to grid)
VALUE (After connection to grid)

NOTE:ValueofEarthResistance<1.0OHM

F.CALIBRATIONOFOTI&WTIPERFORMEDASPERPROCEDURE: Yes No

G.DETAILSOFRELAYS/CONTACTORSUSED:SCHEMATICDRAWINGNO.:__________________

Circuit Make SerialNo. Type Number of NO & Number of AI, BI &

Reference NCcontacts BO
NO NC AI BI+BO

H.EVACUATINGANDOILFILLING:

a) Before filling oil, each drum has been physically checked for free moisture and
appearance: Yes No

b)OILFILTERMACHINE:

Page5of72

 i). Capacity :
ii). Make :
iii). Lubricatingoilofvacuumpumpchangedornot:
iv). FilterPackscleanedornot :
v). Wholefiltermachineflushedwithfreshoilornot :
vi). Vacuumobtainedwithoutload(millibar) :

c)VACUUMPUMPFOREVACUATIONOFTRANSFORMER:

i). LubricatingOilchangedornot :
ii). Vacuumobtainedwithoutload(millibar) :
iii). Diameterofvacuumhose(50mm) :
iv). Dryicechamberemployedornot :

d)OILSTORAGETANK:

i). Insidepaintedornot :
ii). Silicagelbreatherprovidedornot :
iii). Anyopeningleftuncovered :
iv). CapacityofStoragetank(KL) :
v). Cleanlinessofinsideofpipes/hosestothestoragetank:

e)EXPOSUREDURINGERECTION:

i). ExposurehoursduringFirstday,NumberofHours: :
a. N2filledpressure(PSIorBar) :
b. NumberofHoursunderN2 :
c. Ambienttemperature :
d. RelativeHumidity :
e. Weather(sunny/cloudy/stormy/rainy) :
ii). ExposurehoursduringSecondday,NumberofHours: :
a. N2filledpressure(PSIorBar) :
b. NumberofHoursunderN2 :
c. Ambienttemperature :
d. RelativeHumidity :
e. Weather(sunny/cloudy/stormy/rainy) :

iii). ExposurehoursduringThirdday,NumberofHours: :
a. N2filledpressure(PSIorBar) :
b. NumberofHoursunderN2 :
c. Ambienttemperature :
d. RelativeHumidity :
e. Weather(sunny/cloudy/stormy/rainy) :

f)N2SEALINGINCASEOFDELAYINOILFILLING:

a. No.ofCylindersusedfordisplacingtheairinsidethetank:
b. N2admittedfrombottomvalve

Page6of72

 a. Valveatdiametricallyoppositeendattopkeptopen:
b. No.ofCylindersusedforbuildingup2PSI(0.14kg/cm2)

InspectionItem Date Time Checked Remarks

1.Tightnesstest
a.Startevacuatingoncompleteunit
b.Stopevacuatingat3mbar
c. Pressure P1 in kPa, 1 hour after stop
evacuating
d. Pressure P2 in kPa, 0.5 hrs after
readingP1
e. Leakage = (P2P1)X V= If >3.6, continue
evacuating,Visthevolumeofoilasper
nameplate.
2.VACUUM
a.Pressure0.13kPa(1.3mbar)reached
b.Vacuumkeptfor
Upto145kV,12Hour
145kV&upto220kV,24Hours
3.OILFILLING
a.Oilfillingismade
b.OilConservatorwithAirCell
c.OLTC
4.STANDINGTIME
Upto145kV,12Hours
145kV&upto220kV,48Hours

G)RECORDOFDRYINGOUTPROCESS:

Dryingoutstartedon: Date: Time: AmbientTemp:

(Hourlyreadingtobetaken)

Date Time Vacuum Vacuumreading OTIOF Condensate Remarks&sign

readingin Intransformer TANK Collected total ofsupervising
Filtration Tank /Rate Engineer
machine



Record of filtration and Dry out shall be kept in a register and shall be made a part of the Pre
commissioningdocument.

H)INSULATIONRESISTANCEMEASUREMENT:(USING500VMEGGER):

Meggerdetails:

ValidityofCalibration:

Page7of72

Ambienttemperature:

SlNo Description Status Remarks,ifany

Yes No
A ControlWiring
B TapCganger
Motor
Controlwiring
C CoolingSystem
FanMotor
PumpMotor
ControlWiring
NOTE:IRvaluesshouldbe>50Mforcables

I)INSULATIONRESISTANCEMEASUREMENT:(USING5000VMEGGER):

Meggerdetails:

ValidityofCalibration:

Ambienttemperature: TemperatureofOIL:

MainWinding IRValue(M) AI=60ss/15s PI=600s/60s Temp.

15Sec 60Sec 600sec
AutoTransformer
HV+IVtoLV
HV+IVtoE
LVtoE
2WindingTransformer
HVtoE
LVtoE
HVtoLV

J)VECTORGROUPTEST&POLARITYCKECKING

CONNECT NEUTRAL POINT WITH EARTH, JOIN 1RI AND 3 RI TERMINALS, APPLY 415V, 3PHASE
SUPPLYTOHVTERMINALS

Terminal VoltageMeasured Remarks

1R11Y1
1Y11B1
1B11R1
3B11B1
3B11Y1
3R1N
3Y1N
1R1N
2R1N
2Y1N
2B1N

Page8of72

ENSURE2R1N=2Y1N=2B1N=CONSTANT

AS3R1N>3B1N>3Y1N,AND3Y11B1>3B11B1

VECTORGROUPYnaod1ISCONFIRMEDANDPOLARITYVERIFIED

K)MEASUREMENTOFWINDINGRESISTANCE(INOHM)

WindingResistancemeterdetail:

Validityofcalibration:

AmbientTemperature: OTIreading: WTIreading:

i). HVSideMeasurement

Tap Wdg.Resistance,HVN Resistanceat750C Factory Value at Remarks

positi 750C
on 1R12R1 1Y12Y1 1B12B1 R Y B R Y B
1
2
3
4
5
6
7
8
9b
10
11
12
13
14
15
16
17

FactoryTestReportRef.NO:

ii). INTERMEDIATEVOLTAGESIDE:

BetweenWinding Resistance Resistanceat750C Remarks

AtSite Site Factory
2R1N
2Y1N
2B1N

iii). LOWVOLTAGESIDE:

Page9of72

BetweenWinding Resistance Resistanceat750C Remarks

AtSite Site Factory
3R1N3B1
3Y13R1
3B13Y1

NOTE: LV WINDING RESISTANCE AT FACTORY MEASURED WITHOUT FORMATION OF DELTA.

HOWEVER MEASUREMENTS CARRIED OUT AT SITE ARE AFTER FORMATION OF DELTA. HENCE A
CORRECTIONFACTOROF1.5TIMESTOBEAPPLIEDINSITERESULTS.

L)MAGNETICBALANCETEST:

Applysinglephase230VacrossonephaseofHVwindingterminalandneutralthenmeasurevoltage
inothertwoHVterminalsacrossneutral.Repeatthetestforeachofthethreephases.

Apply 1ph, 230V AC VoltagemeasuredinVolts Remarks

across(1) Between(2) Between(3)
2R1N 2Y1N 2B1N
2Y1N 2R1N 2B1N
2B1N 2Y1N 2R1N

M)FLOATINGNEUTRALVOLTAGEMEASUREMENT

Disconnectthetransformerneutralfromtheground

Apply3phase415voltstothehighvoltagewindingandmakethemeasurementintheIVwinding
withrespecttoneutralandneutralpointtoground.

TapPosition HVWinding Voltage IVWinding Voltage Remarks, if

Applied Measured any
Normal() 1RN 2RN
Normal() 1YN 2YN
Normal() 1BN 2BN
NEarth

Apply 3 phase 415 volts to the intermediate voltage winding and make the measurement in the
tertiarywindingwithrespecttoneutralandneutralpointtoground.

IVWinding VoltageApplied LVWinding Voltage Remarks,ifany

Measured
2RN 3RN
2YN 3YN
2BN 3BN
NEarth

Check:Afterthetest,neutralreconnectedtoGround: Yes/No

N)MAGNETISATIONCURRENTTEST:

Page10of72

TestingInstrumentdetail:

TestingInstrumentCalibrationvalidornot:

Ambienttemperatureatthetimeoftest:

TemperatureofOIL:

i). APPLY1PHASEACSUPPLYONHVTERMINALSANDKEEPIV&LVOPEN
TapPosition Voltage Current Factory test Remarks
Applied(V) Measured(mA) value
Lowest() RN Rph
YN Yph
BN Bph
Normal() RN Rph
YN Yph
BN Bph
Highest() RN Rph
YN Yph
BN Bph

ii). APPLY1PHASEACSUPPLYONIVTERMINALSANDKEEPHV&LVOPEN
TapPosition Voltage applied Currentmeasured Remarks
(Volts) inLVside(mAmps)
Normal() 2RN
2YN
2BN

P)VOLTAGERATIOTEST:

TestingInstrument(TRM)detail:
TestingInstrumentCalibrationvalidornot:
Ambienttemperatureatthetimeoftest:
TemperatureofOIL:
i). RatioHV/IV

Tap Voltageapplied Voltagemeasured Ratio FactoryRatio

Pos 1RN 1YN 1BN 2RN 2YN 2BN R Y B R Y B
1
2
3
4
5
6
7
8
9
10
11
12

Page11of72

 13
14
15
16
17

ii). RATIO:HV/LV

Tap Voltageapplied Voltagemeasured Ratio FactoryRatio

Position 1RN 1YN 1BN 3RN 3YN 3BN R Y B R Y B
Lowest
Normal
Highest

iii). RATIO:IV/LV

Tap Voltageapplied Voltagemeasured Ratio FactoryRatio

Position 2RN 2YN 2BN 3RN 3YN 3BN R Y B R Y B
Lowest

Q)OILCHARACTERISTICS:

Date: Time: AmbientTemp:

OTIreading: WTIreading:

SampletobecollectedbeforeCharging&followingvaluetobeachieved:

BDV:Min70kV

MoistureinPPM:Min10

Tandelta(900C):Max0.1

Resistivity:Min6x1012Ohmcm

InterfacialTensionat270C:Min0.035N/m

OILSample BDV(kV) Moisture Tandelta Resistivity Inter facial Remarks

(PPM) (Ohmcm) tension
(N/m)
MainTank
Top
Bottom
OLTC

R)DISSOLVEGASANALYSIS

DISOLVE OILSAMPLESCHEDULE

Page12of72

GASES Before 24Hrs 7Days 15Days 01Month 03Month

Charging After After After After After
Charging Charging Charging Charging Charging
TotalGas%
H2
CH4
C2H4
C2H6
C2H2
CO
CO2
O2
N2

S)TestonOLTC:

Sl Description Status Remarks

No OK NotOK
1 Visualinspectionofequipment
2 Manualoperationonalltaps(local)withconfirmation
oftheno.ofrevolutionsandLockingatextremetaps
3 Overloaddeviceofdrivingmotor
4 Localoperation(Electrical)
5 Remoteoperation(Electrical)
6 Tappositionindicator
7 CheckoperationwithMasterFollowerscheme(parallel
operation)
8 Outofsteprelay
9 StepbyStepContactor
10 LimitSwitch
11 Windingresistanceatalltaps
12 ContinuitytestofwindingduringoneCompletecycleof
operation

T)OPERATIONALTESTOFOTHEREQUIPMENTS

i). CHECKINGOFCOOLINGEQUIPMENTS
a) RotationDirectionofPumps: OK NotOk
b) RotationDirectionofFans: OK NotOk
ii). PROTECTIONCHECKS
Eqpt. SettingValue PickupValue SinglePhasing
FanNo Preventioncheck
1
2
3
4
5
6

Page13of72

 7
8
9
10
11
12
PumpNo
1
2
3
4

U)INSULATIONRESISTANCEMEASUREMENTOFBUSHINGCTs:(USING500VMEGGER)

Between HV IV Neutral LV
Rph Yph Bph Rph Yph Bph Rph Yph Bph
EarthCoreI
EarthCoreII
EarthCoreIII
EarthCoreIV
CoreICoreII
CoreICoreIII
CoreICoreIV
CoreIICoreIII
CoreIICoreIV
CoreIIICoreIV

V)CONTINUITYTESTOFBUSHINGCT's

Core Between HV IV Neutral LV

Terminal Rph Yph Bph Rph Yph Bph Rph Yph Bph
CoreI 1S11S2
CoreII 2S12S2
CoreIII 3S13S2
CoreIV 4S14S2

W)SECONDARYWINDINGRESISTANCEOFBUSHINGCT's(INOHM)

i). HVSIDE

Core Between RPhase() YPhase() BPhase()

Terminal Factory Site Factory Site Factory Site
COREI 1S11S2
COREII 2S12S2
COREIII 3S13S2
COREIV 4S14S2

Page14of72

 ii). IVSIDE

Core Between RPhase() YPhase() BPhase()

Terminal Factory Site Factory Site Factory Site
COREI 1S11S2
COREII 2S12S2
COREIII 3S13S2
COREIV 4S14S2

iii). LVSIDE

Core Between RPhase() YPhase() BPhase()

Terminal Factory Site Factory Site Factory Site
COREI 1S11S2
COREII 2S12S2
COREIII 3S13S2
COREIV 4S14S2

iv). NEUTRALSIDE

Core Between NEUTRAL()

Terminal Factory Site
COREI 1S11S2

X)POLARITYTESTOFBUSHINGCT's:(With1.5VDCSupply)

i). POLARITYOFHV&IVBCT

CORE Between HV IV
RPH YPH BPH RPH YPH BPH
COREI 1S1(+ve) 1S2(ve)
COREII 2S1(+ve) 2S2(ve)
COREIII 3S1(+ve) 3S2(ve)
COREIV 4S1(+ve) 4S2(ve)

ii). POLARITYOFLV&NeutralBCT

CORE Between LV Neutral

RPH YPH BPH
COREI 1S1(+ve) 1S2(ve)
COREII 2S1(+ve) 2S2(ve)
COREIII 3S1(+ve) 3S2(ve)
COREIV 4S1(+ve) 4S2(ve)

Y)CURRENTRATIOTEST:Measurecurrentonsecondaryterminals

i). RPHASE:HVSIDE

Page15of72

 CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%

ii). YPHASE:HVSIDE

CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%

iii). BPHASE:HVSIDE

CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%

Page16of72

iv). RPHASE:IVSIDE

CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%

v). YPHASE:IVSIDE

CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%

vi). BPHASE:IVSIDE

CORE Primary Current Secondary Theoretical Actual %

S1S2 % Actual Current Ratio Ratio Error
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%

Page17of72

COREIV 20%
(4S14S2) 40%
80%
Z)MAGNETISINGCURVESPERFORMANCE:

(NOTTOBEDONEFORMETERINGCORE)

KNEEPOINTVOLTAGE(KVP)=

i). RPHASE:HVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

ii). YPHASE:HVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

iii). BPHASE:HVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

iv). RPHASE:IVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

Page18of72

v). YPHASE:IVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

vi). BPHASE:IVSIDE
VOLTAGE CURRENTMEASUREMENT(mA)
Tobeapplied Actual COREI COREII COREIII COREIV
Value 1S11S2 2S12S2 3S13S2 4S14S2
0.25xKVP
0.50xKVP
0.75xKVP
1.00xKVP
1.10xKVP

AA)CONTACTRESISTANCEMEASUREMENT:At100AMPS

NOTE:THEVALUEOFCONTACTRESISTANCESHOULDNOTBEMORETHAN10PERJOINT/
CONNECTOR

CONTACTRESISTANCE RPH() YPH() BPH()

AcrossHVBushingTerminalBushing
AcrossIVBushingTerminalBushing
AcrossLVBushingTerminalBushing
AcrossNeutralBushingTerminalBushing
AcrossSurgeArrestorConnection

AB)BUSHINGDETAILS:

DrawingNo.__________________________________

Details HVSide IVSide LVSide Neutral

Rph Yph Bph Rph Yph Bph Rph Yph Bph
Make
Type
Sl.No

AC)TANDELTAANDCAPACITANCEMEASUREMENTOFBUSHING

TestingInstrumentdetail:

Page19of72

 TestingInstrumentCalibrationvalidornot:
Ambienttemperatureatthetimeoftest:
TemperatureofOIL:
i). HVSIDE
VOLTAGE CAPACITANCE(MeasuredValue) Remarks
RPHASE YPHASE BPHASE
SITE FACTORY SITE FACTORY SITE FACTORY
1kV
2kV
10kV

VOLTAGE TANDELTA(MeasuredValue) Remarks
RPHASE YPHASE BPHASE
SITE FACTORY SITE FACTORY SITE FACTORY
1kV
2kV
10kV

ii). IVSIDE
VOLTAGE CAPACITANCE(MeasuredValue) Remarks
RPHASE YPHASE BPHASE
SITE FACTORY SITE FACTORY SITE FACTORY
1kV
2kV
10kV

VOLTAGE TANDELTA(MeasuredValue) Remarks

RPHASE YPHASE BPHASE
SITE FACTORY SITE FACTORY SITE FACTORY
1kV
2kV
10kV

AD)TANDELTAANDCAPACITANCEMEASUREMENTOFWINDINGS

TestingInstrumentdetail:____________________________________________________
TestingInstrumentCalibrationvalidornot:___________________
Ambienttemperatureatthetimeoftest:_______________
TemperatureofOIL:__________________

Voltage Winding Test CAPACITANCE TANDELTA Remarks

Combination Mode Site Factory Site Factory
2kV HVIV/LV UST
10kV

Page20of72

2kV HVIV/LV+G GST

10kV
2kV HVIV/LV GSTg
10kV withGuard
2kV LV/HVIV+G GST
10kV
2kV LV/HVIV GSTG
10kV withGuard

AD)SHORTCIRCUITIMPEDANCETEST

TestingInstrumentdetail:____________________________________________________
TestingInstrumentCalibrationvalidornot:___________________
Ambienttemperatureatthetimeoftest:_______________
TemperatureofOIL:__________________
i). HVTOIV
1U1(R) 1V1(Y) 1W1(B)
(IV OF R AND N (IV OF Y AND N (IV OF B AND N
TapNo. SHORTED,LVOPEN) SHORTED,LVOPEN) SHORTED,LVOPEN)
Voltage(V) Current(A) Voltage(V) Current(A) Voltage(V) Current(A)
LOWEST
NORMAL
HIGHEST

ii). IVTOLV(NORMALTAP)
SUPPLY SHORT ALL 3 LV SHORT ALL 3 LV SHORT ALL 3 LV
BUSHINGS,HVOPEN BUSHINGS,HVOPEN BUSHINGS,HVOPEN
2U1N ____________A
2V1N _____________A
2W1N ____________A

iii). HVTOLV(NORMALTAP)
SUPPLY SHORT ALL 3 LV SHORT ALL 3 LV SHORT ALL 3 LV
BUSHINGS,HVOPEN BUSHINGS,HVOPEN BUSHINGS,HVOPEN
1U1N ____________A
1V1N _____________A
1W1N ____________A

ATLOWESTTAP
SUPPLY SHORT ALL 3 LV SHORT ALL 3 LV SHORT ALL 3 LV
BUSHINGS,HVOPEN BUSHINGS,HVOPEN BUSHINGS,HVOPEN
1U1N ____________A
1V1N _____________A
1W1N ____________A

ATHIGHESTTAP

Page21of72

 SUPPLY SHORT ALL 3 LV SHORT ALL 3 LV SHORT ALL 3 LV

BUSHINGS,HVOPEN BUSHINGS,HVOPEN BUSHINGS,HVOPEN
1U1N ____________A
1V1N _____________A
1W1N ____________A

AE)PROTECTIONANDALARMS
SL Device SETFOR PROVED
No ALARM TRIP ALARM TRIP
1. ExcessiveWindingTemperature
2. ExcessiveOilTemperature
3. OilFlowFailure NA NA
4. PressureReliefValve NA NA
5. MainTankBuchholzrelay
6. OLTCBuchholzrelay NA NA
7. FanFailure NA NA
8. LowOilLevelGauge(MOLG) NA NA
9. Differentialrelay NA NA
10. OverloadRelay NA NA
11. REF NA NA
12. OverCurrent NA NA
13. Intertrip,ifany NA NA
14. TripFreeCheck NA NA
15. BackupOverCurrent NA NA
16. OverFlux

AF)DETALSOFPROTECTIONSETTINGS:
i). DIFFERENTIALPROTECTION:
a. DIFFERENTIALCHARACTERISTICSSETTINGS
b. Function Enabled
c. Pickup Enabled/Disabled
d. Slope1 Enabled/Disabled
e. Break1 Enabled/Disabled
f. Break2 Enabled/Disabled
g. Slope2 Enabled/Disabled
h. InrushInhibitMode Enabled/Disabled
i. InrushInhibitLevel Enabled/Disabled
j. OverexcitationInhibitFunction Enabled/Disabled
k. OverexcitationInhibitLevel Enabled/Disabled
ii). REFPROTECTION
REFSETTINGS:
a. Function Enabled

Page22of72

 b. Source
c. Pickup
d. Slope
e. PickupDelay
f. ResetDelay
iii). OVERFLUXINGPROTECTION:
OVERFLUXINGSETTINGS:
a. Function Enabled
b. Source
c. Pickup
d. Curves
e. TDMultiplier
f. TReset
iv). BACKUPPROTECTION:
LVSide:
a. OvercurrentSettings:
PS TMS HS
__________ ______ _________
b. EarthFaultSettings:
PS TMS HS
__________ ______ _________

HVSIDE:
c. OvercurrentSettings:
PS TMS HS
__________ ______ _________
d. EarthFaultSettings:
PS TMS HS
__________ ______ _________

AG)STABILITYTESTOFDIFFERENTIAL&REFPROTECTION: OK/NotOK

NOTE : Prove the tripping of associated breakers by actual operation of the various devices and
relaysaspertheschemes.

AH)FREQUENCYRESPONSEANALYSIS(FRA)

Page23of72

 i). Carriedoutaftercompletionofallcommissioningactivities: Yes/No

ii). Interpretationoftestresultscarriedout: Yes/No
iii). Testresultsmatchingwiththefactoryresults: Yes/No
iv). Factory&sitefratestreportavailableatsite: Yes/No

AI)allelectricaltestresultscomparedwithFactorytestresultsandfoundtobeinorder:Yes/No

CHECKSAFTERCHARGINGOFTRANSFORMER
AK)RECORDTHEFOLLOWINGAFTERCHARGING:
i). Anyabnormalsoundemanatingfromthetransformer:Yes/No/Remarks

ii). Noloadcurrentatrelayterminal:
RPhase:______________A
YPhase:__________________A
BPhase:___________________A
CTR:______________________

iii). TemperatureatthetimeofCharging:
OTI :_____________0C
WTI :_____________0C
Ambienttemperature:______________0C

iv). MAXIMUMTEMPERATUREAFTER24HOURS:___________0C

v). OLTC electrical operation checked in idle charged condition from min position to max
positionandbacktonormalposition: YES/NO
vi). Thermovisionscanningdoneatleastafter24hoursofloadingandrepeatedafteroneweek:
YES/NO.

AL)FINALDOCUMENTATIONREVIEW

i). FACTORYTESTRESULTSAREAVAILABLE: YES/NO

ii). FINALDOCUMENTOFPRECOMMISSIONINGCHECKS
REVIEWEDANDAPPROVED: YES/NO

Page24of72

 iii). DOCUMENTSREGARDINGSPARES,EQUIPMENT,O&M
MANNUALSETCAVAILABLEATSITEFORO&MPURPOSE: YES/NO

iv). AFTERMODIFICATION,IFANY,"ASBUILTDRAWINGS"
AREAVAILABLEATSITE: YES/NO

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page25of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED

PRECOMMISSIONINGOFISOLATORANDGROUNDSWITCH

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNO: DATEOFTESTING:

EQUIPMENTSERIALNO:RPhase___________YPHASE____________BPHASE______________

Type: MAKE:

Voltagelevel,kV 33 132 220 400

CurrentCarryingCapacity:___________A

TypeofOperatingMechanism:

ControlVoltage:______________VoltDC

1) DETAILS:
SL DESCRIPTION STATUS REMARKS, IF
No ANY
YES NO
1. Equipment is free from dirt/dust Foreign materials
etc.
2. Equipmentisfreefromallvisibledefectsonphysical
inspection
3. Support structures, marshalling box Has been
providedwithtwoearthingPads/points
4. All nuts and bolts are tightened correctly as per
specifiedtorque
5. Equipmenterectioniscompleteinallrespectasper
instruction manual (attach remaining activities, if
any)
6. Permanent isolator levelling and identification is
done
7. Levellingandalignmentofstructureandbaseframe
ischecked

Page26of72

 8. Control box / marshalling kiosk is free from any

physicaldefects
9. Tightness of nuts bolts of terminal connectors are
checked
10. Auxiliarycontactsandrelayshavebeencleanedand
freefromrust/damage
11. Coronaringsareprovidedandproperlyfixed
12. Cableterminationandtightnesscheckedandunused
holessealed
13. Externalcablingiscompletedinallrespect
14. All the cable identification tags provided and all
cores are provided with identification ferrules at
M.B.
15. Allmovingpartsarelubricated
16. Alignmentofisolatoralreadymadeandlockingbolt
provided,ifany
17. FreenessofmanualoperationisOK
18. Greasing has been made on the main contacts
accordingtothemanufacturersinstruction
19. Functional checking of auxiliary Contacts for
indicationsandinterlocks
20. Erection completion certificate along with list of
outstandingactivitiesreviewed
21. All spare wires to be kept with ferrules but not
terminatedattheterminalblocks
22. Earth switch connected to earth through braided
wires
23. Interlockscheckedasperapprovedschemewithall
combinations
24. CheckthatearthswitchbladealignmentIncondition
isatsufficientdistantfromIsolator
25. Check that operation and positioning of the limit
switch&theauxiliarycontactsassemblyareok
26. Check that all three phase isolators are Closing &

Page27of72

 Openingatatime
27. Checkall3earthswitchescloseatthesametime
28. Provision of bimetallic strips ensured wherever
applicable

2) MOTORDETAILS:
a) Make:
b) Sl.No:
c) Type:
d) HP/KW:
e) Volt:
f) Ampere:
g) YearofManufacture:
h) OverloadSettings:
i) Insulation Resistance of Motor Winding (Winding to Earth): (By 500 V
Megger):_____________M.
3) ISOLATOROPERATIONALCHECK:
a) OperatetheIsolatorandrecordthemotorcurrent:
a. Open:_________________A
b. Close:_________________A
b) OPERATIONOFISOLATORFROMLOCAL/REMOTE: OK/NOTOK
IsolatorOperation CONTROLPANEL
LOCAL REMOTE
Open
Close

c) MEASUREMENTOFOPERATINGTIME
OPERATION PHASE
RPhase YPhase BPhase
CLOSING(Sec)
OPENING(Sec)

d) AUXILLARYCONTACTSCHECKING

Page28of72

 ISOLATOR AUXILIARY OPERATIONTIME

OPERATION RELAY RPHASE YPHASE BPHASE
TYPE NO NC NO NC NO NC
CLOSE



OPEN




4) INSULATIONRESISTANCETEST(USING5000VOLTMEGGER):
ISOLATOROPENCONDITION
BETWEEN PHASE
RPhase YPhase BPhase
MalesidetoGround
FemalesidetoGround
MalesidetoFemaleside

5) CONTACTRESISTANCEMEASUREMENT:
(TOBEMEASUREDAFTER50OPERATIONS)
a) ISOLATORCLOSECONDITION
(CONTACTRESISTANCESHOULDBELESSTHAN10/CONNECTOR)
ACROSS PHASE
RPhase() YPhase() BPhase()
CONNECTOR(MALESIDE)
CONNECTOR(FEMALESIDE)
MAINCONTACT(MALE&FEMALE)

b) ISOLATOROPENCONDITION&GROUNDSWITCHCLOSE
(CONTACTRESISTANCESHOULDBELESSTHAN150/BREAK)

Page29of72

 ACROSS PHASE
RPhase() YPhase() BPhase()
MAINCONTACT(MALE&FEMALE)
(GROUNDSWITCH)

c) ResistanceofOperatingCoil____________________
d) ResistanceofInterlockingCoil____________________
6) FINALDOCUMENTATIONREVIEW:
a) FINALDOCUMENTOFPRECOMMISSIONINGCHECKS
REVIEWEDANDAPPROVED: YES/NO
b) DOCUMENTSREGARDINGSPARES,EQUIPMENT,O&M
MANNUALSETCAVAILABLEATSITEFORO&MPURPOSE: YES/NO
c) AFTERMODIFICATION,IFANY,"ASBUILTDRAWINGS"
AREAVAILABLEATSITE: YES/NO

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page30of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED

PRECOMMISSIONINGOFWAVETRAP
COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNO: DATEOFTESTING:

EQUIPMENTSERIALNO:RPhase___________YPHASE____________BPHASE______________

Type: MAKE:

Voltagelevel,kV 132 220 400

Currentrating:___________A

mHRating: BANDWIDTH:

1. DETAILS:CHECKLIST/TESTING
SL DESCRIPTION STATUS REMARKS, IF
No ANY
YES NO
1. Equipment is free from dirt/dust Foreign materials
etc.
2. Equipmentisfreefromallvisibledefectsonphysical
inspection
3. Support structures, has been provided with two
earthingPads/points
4. All nuts and bolts are tightened correctly as per
specifiedtorque
5. Permanent isolator levelling and identification is
done
6. Levellingandalignmentofstructureandbaseframe
ischecked
7. Allinsulators&linematchingunitarefreefromany
physicaldefects
8. Tightnessof nuts/ bolts ofterminalconnectorsare
checked

Page31of72

 9. Erection completion certificate along with list of

outstandingactivitiesreviewed
10. CheckthatthetuningunitandArrestorareproperly
tightenedAndfreefromanydamage

2. INSULATIONRESISTANCEMEASUREMENT:
SL BETWEEN MEGGER PHASE Permissive
NO RPHASE YPHASE BPHASE Value
Upper Terminal 5000V 1000M
&Earth
LA of the Wave 500V 1M
Trap

3. CONTACTRESISTANCEMEASUREMENT:
THEVALUESHOULDNOTMORETHAN5PERCONNECTOR/JOINT
SL PHASE
No ACROSS RPhase() YPhase() BPhase()
1 UpperTerminal
2 BottomTerminal

4. FINALDOCUMENTATIONREVIEW:
a) Finaldocumentofprecommissioningchecks
ReviewedandApproved: YES/NO

b) Documentsregardingspares,equipment,O&M
Manualsetc.availableatsiteforo&mpurpose: YES/NO

c) Aftermodification,ifany,"asbuiltdrawings"
areavailableatsite: YES/NO

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page32of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED
PRECOMMISSIONINGOFSF6CIRCUITBREAKER

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNAME/NO:

DATEOFERECTION: DATEOFENERZIZATION:

EQUIPMENTSERIALNO:RPhase___________YPHASE____________BPHASE______________

SERIALNO(FORGOTYPE):

Type: MAKE:

Voltagelevel,kV 33 132 220 400

Currentrating:___________A RATEDBREAKINGCAPACITY:

CONTROLVOLTAGE:

DETAILS:CHECKLIST/TESTING

SLNo DESCRIPTION STATUS REMARKS,RECORD

DEFICIENCIES,IFANY
YES NO
1. Equipment is free from dirt/dust Foreign
materialsetc.
2. Equipment is free from all visible defects on
physicalinspection
3. Supportstructures,hasbeenprovidedwithtwo
earthingPads/points
4. Allnutsandboltsaretightenedcorrectlyasper
specifiedtorque
5. Equipmenterectioniscompleteinallrespect&
erectioncompletionCertificatealongwithlistof
Outstandingactivitiesreviewed.
(ATTACHREMAININGACTIVITIES,IFANY)
6. Permanent pole levelling and Identification is
done
7. Levelling and alignment of structure and base
frameischecked
8. Controlbox/marshallingkioskisfreefromany

Page33of72

 physicaldefects
9. Tightness of nuts bolts of terminal connectors
arechecked
10. i) Auxiliary contacts and relays have been
cleanedandfreefromrust/damage
ii) All spare wires to be kept with ferrules but
notterminatedattheterminalblocks
iii) Check all the valves in the SF6 pipe line are
tightened,dilocouplingaretightened.
11. Slow and power closing operation and opening
done.(whereverapplicable)
12. OperatingSystem
a) Closing
i). Hydraulic
ii). Spring
iii). Pneumatic
b) Opening
i). Hydraulic
ii). Spring
iii). Pneumatic
12.1. HYDRAULICSYSTEM
12.1.1. ACCUMULATOR
a) Make
b) SerialNo:
Rph:
YPh
BPh
c) Type
d) YearofManufacture
12.1.2. PUMPDETAILS
a) Make
b) Type
c) Sl.No
d) Volt
e) Ampere
f) HP/KW
g) YearofManufacture

12.1.3. DETAILSOFRELAYS/CONTACTORSUSED:SCHEMATICDRAWINGNO:____________
CIRCUITREFERENCE MAKE SerialNo. TYPE NO+NC
OilPressuremonitor
Closinglockout

Page34of72

 Autoreclosinglockout
Generallockout
AntiPumpingcontactor
Polediscrepancytimer
Auxiliary
Powercontactor
Others

12.1.4. OPERATIONCHECK:
Dateoffillinghydraulicoil: ____________________
Typeofhydraulicoil: _____________________
VentingofHydraulicSystemisdone:
a) Pump ___________________
b) PilotValve ___________________
c) Accumulator ___________________
d) HydraulicMechanism ___________________

PREFILLINGPRESSUREOFN2 FACTORYTEST SITETEST
0
INACCUMULATOR(BARatDeg.C) _______at C ______at0C

Pumprunningtimeforcharging
Hydraulicsystemfrominitialpressure _________ MIN ________
toworkingpressure
CHECKINGSAFETYVALVE(OPEN/CLOSE) _________ BAR ________

HYDRAULICPRESSUREDROPFOR1HR
BREAKERONPOSITION _________ BAR _______

BREAKEROFFPOSITION _________ BAR _______

OILPRESSUREMONITOR
PUMPON/OFFBAR _________ BAR _______
PUMPRUNNINGTIME _________ SEC _______

AUTORECLOSINGLOCKOUT(OIL)

Page35of72

 FACTORYTEST SITETEST
PRESSURECONTACT__________MAKE/BREAK_________ BAR _______

CLOSINGLOCKOUT(OIL)
PRESSURECONTACT__________MAKE/BREAK_________ BAR _______

GENERALLOCKOUT(OIL)
PRESSURECONTACT__________MAKE/BREAK_________ BAR _______

CHECKINGANTIPUMPINGCONTACTOR
PRESSURECONTACT__________MAKE/BREAK OK/NOTOK

CHECKINGLOSSOFNITROGEN
PRESSURECONTACT__________MAKE/BREAK OK/NOTOK

12.1.5. OILPRESSUREDROPDURINGOPERATIONSANDPUMPRUNNINGTIMEINSECONDS
Sl Description FactoryTest SiteTest
No Value Value
1 Pressurebeforeoperation,BAR
PressureafterClosingoperation,BAR
Pumprunningtime,Sec
2 Pressurebeforeoperation,BAR
PressureafterOpeningoperation,BAR
Pumprunningtime,Sec
3 Pressurebeforeoperation,BAR
PressureafterClose/Openoperation,BAR
Pumprunningtime,Sec
4 Pressurebeforeoperation,BAR
PressureafterOpenCloseOpenoperation,BAR
Pumprunningtime,Sec

12.2. SPRINGOPERATINGSYSTEM
12.2.1. MOTORDETAILS:
Make: Type: SerialNo:

Volt: Ampere: HP/KW:

Page36of72

 ThermalOverloadSetting:

DCcurrenttakenbyMotorforchargingtheSpring_______________Amp

12.2.2. DETAILSOFRELAYS/CONTACTORSUSED:SCHEMATICDRAWINGNO:____________
CIRCUITREFERENCE MAKE SerialNo. TYPE NO+NC
OilPressuremonitor
Closinglockout
Autoreclosinglockout
Generallockout
AntiPumpingcontactor
Polediscrepancytimer
Auxiliary
Powercontactor
Others

12.2.3. SPRINGOPERATINGTIME:
TIMETAKENBYTHESPRINGTOCHARGEFULLYAFTERCLOSINGOFBREAKER
DETAILS RPHASE YPHASE BPHASE
Factory Site Factory Site Factory Site
Chargingtime

13. SF6DENSITYMONITORDETAILS
QuantityofSF6GasFilled
Make ACTUAL ASPERSPEC Remark
Model RPh YPh BPh RPh YPh BPh
SerialNo Rph:
Yph:
BPh:

13.1. SF6DENSITYMONITORSETTINGS
PHASE DETAILS BLOCKING DEBLOCKING SF6GASFILLEDAT
Factory Site Factory Site __________BAR
RPH RefillAlarm AT_________0CON
OperationBlock ____/_____/_____

Page37of72

 YPH RefillAlarm
OperationBlock
BPH RefillAlarm
OperationBlock

13.2. MEASUREMENTOFDEWPOINTOFSF6GAS:
SLNO Description MeasuredValue
Minimum value of Dew Point as
perSF6Gassupplier/Manufacturer
ofCB

NOTE:DewpointmeasurementofSF6gasneedstobedonepolewiseincloseloopmethod
withoutanywastageofsf6gas.

13.3. LEAKAGECHECK:
SlNo Description PHASE
RPhase YPhase BPhase
A InitialfillingofSF6Gasat_____0C
(ASperTemp.correctionchart)
_____BAR _____BAR _____BAR
B DropinSF6GasPressurein24Hrs _____BAR _____BAR _____BAR
C Fillingpressureat________0C _____BAR _____BAR _____BAR
(Afteralltesting)
D Additionalleakagetestbycovering Yes/No Yes/No Yes/No
IndividualjointwithPolythene

14. COILRESISTANCEMEASUREMENT:
SLNO PHASE COIL MEASURED SERIES TOTAL
VALUE() RESISTOR() ()
A RPhase TRIPCOILI
TRIPCOILII
CLOSECOIL
B YPhase TRIPCOILI
TRIPCOILII
CLOSECOIL
C BPhase TRIPCOILI
TRIPCOILII
CLOSECOIL

15. CIRCUITARY/OPEARTIONALCHECKS:

Page38of72

 SLNO CIRCUITREFERENCE CIRCUITRYCHECK OPERATIONALCHECK

LOCAL REMOTE LOCAL REMOTE
A TrippingthroughTCI
B TrippingthroughTCII
C Closingcircuit
D ANTIPUMPINGOPERATION
(CloseOpenoperation)
E POLEDiscrepancyfeature
F BreakerPositionIndication
G HeaterinSwitchCubicle
H HeaterinControlCubicle
I IlluminationinSwitchCubicle
J IlluminationinControlCubicle

NOTE:Incasewiringforremoteoperationisnotready,pleaseindicateterminalnumberalong
with wire ferrule number in switch cubicle where remote cables shall be terminated. Remote
operationcanbecheckedfromtheseterminals.

16. OPERATINGTIME(INMILLISECONDS):
PHASE BREAK CLOSE OPEN CLOSEOPENUSING
TRIPI TRIPII TRIPI TRIPII
RPHMainContact
RPHPIR BREAKI
AUXILIARYContact
RPHMainContact
RPHPIR BREAKII
AUXILIARYContact
YPHMainContact
YPHPIR BREAKI
AUXILIARYContact
YPHMainContact
YPHPIR BREAKII
AUXILIARYContact
BPHMainContact
BPHPIR BREAKI
AUXILIARYContact
BPHMainContact
BPHPIR BREAKII
AUXILIARYContact

17. IRVALUEOFCONTROLCIRCUIT:(Use500VMegger)
BeforeMeggeringisolateDCforTripCoilI&IIandClosingCoil
COILDETAIL MEASUREDVALUE(M)
RPhaseTripCoilI
RPhaseTripCoilII
RPhaseClosingCoilII

Page39of72

 YPhaseTripCoilI
YPhaseTripCoilII
YPhaseClosingCoilII
BPhaseTripCoilI
BPhaseTripCoilII
BPhaseClosingCoilII

18. IRVALUEWITHBREAKEROPEN:(Using5000VMegger)
ACROSSOPENCONTACT MEASUREMENTVALUE(M)
RPhaseBreakI
RPhaseBreakII
YPhaseBreakI
YPhaseBreakII
BPhaseBreakI
BPhaseBreakII

19. IR VALUE WITH RESPECT TO EARTH WITH BREAKER CLOSED, EARTH SWITCH AND ISOLATOR
OPEN:(USING5000VOLTMEGGER)
BETWEEN MEASUREMENTVALUE(M)
RPHASEandEARTH
YPHASEandEARTH
BPHASEandEARTH

20. MINIMUMPICKUPVOLTAGEOFCOILS:
COILDETAILS MEASUREMENTVALUE(V)
RPhaseTripCoilI
RPhaseTripCoilII
RPhaseClosingCoil
YPhaseTripCoilI
YPhaseTripCoilII
YPhaseClosingCoil
BPhaseTripCoilI
BPhaseTripCoilII
BPhaseClosingCoil

21. GRADINGCAPACITOR:
21.1. DETAILS

Page40of72

 DETAILS INTERRUPTER1 INTERRUPTER2

R Y B R Y B
MAKE
SerialNo.
Capacitancevalue
YearofManufacture

21.2. CAPACITANCEANDTANDELTAMEASUREMENT:(TobedoneonUSTmode)
DESCRIPTION INTERRUPTER1 INTERRUPTER2
R Y B R Y B
CAPACITANCE:
SITE
FACTORY
TANDELTA:
FACTORY
SITE

22. CONTACTRESISTANCEMEASUREMENT:
SL PHASE ACROSSEACHPOLE INTERRUPTER1 INTERRUPTER2
NO FACTORY SITE FACTORY SITE FACTORY SITE
1 RPhase
2 YPhase
3 BPhase

23. BREAKEROPERATIONCOUNTERREADING:
Sl PHASE COUNTER READING DATE
No TYPE
ELECTRICAL MECHANICAL
1 RPhase
2 YPhase
3 BPhase

24. CHECKFORANNUNCIATIONINCONTROLROOM:
(Asperthefollowingformatsandrecordthereading)

Page41of72

 Sl DESCRIPTION OF SOURCEOF WINDOW/HMI RESULT REMARKS

NO TEST INITIATION DESCRIPTION OK NOT
OK
1 Switch off the DC Control Source I/II DC
source in control cubicle DC Fail,ACFail
cubicle Switch
ON/OFF
2 Switch off the AC Control Source I/II DC
source in control cubicle AC Fail,ACFail
cubicle Switch
ON/OFF
3 ShorttheALARMcontactsofSF6GASDensityMonitor
RPhase DENSITY SF6 GAS DENSITY
MONITOR LOW
YPhase DENSITY SF6 GAS DENSITY
MONITOR LOW
BPhase DENSITY SF6 GAS DENSITY
MONITOR LOW
4 RemovethecableconnectedtoDensityMonitor
RPhase DENSITY OPERATION/CLOS
MONITOR INGLOCKOUT
YPhase DENSITY OPERATION/CLOS
MONITOR INGLOCKOUT
BPhase DENSITY OPERATION/CLOS
MONITOR INGLOCKOUT
5 Give Tripping PD Relay at Breaker Pole
command to RPh CBCubicle Discrepancy
onlyandcheckthe
operation of Pole
DiscrepancyRelay
6 Give Tripping PD Relay at Breaker Pole
command to YPh CBCubicle Discrepancy
onlyandcheckthe
operation of Pole
DiscrepancyRelay
7 Give Tripping PD Relay at Breaker Pole
command to YPh CBCubicle Discrepancy
onlyandcheckthe
operation of Pole
DiscrepancyRelay
8 Close the breaker Protection BreakerAutoTrip
and Trip through relay as per
Protection which scheme
areapplicable

NOTE:ThetrippingdetailsaretobecheckedaspertheSchemeapprovedbydesign.
25. Operationtimemeasurementofpolediscrepancyrelay:
26. Mechanicalcloseinterlockchecked(whereverapplicable): Yes/No

Page42of72

27. FINALDOCUMENTATIONREVIEW:
a) FactoryTestresultsareavailable YES/NO
b) Finaldocumentofprecommissioningchecks
ReviewedandApproved: YES/NO

c) Documentsregardingspares,equipment,O&M
Manualsetc.availableatsiteforo&mpurpose: YES/NO

d) Aftermodification,ifany,"asbuiltdrawings"
areavailableatsite: YES/NO

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page43of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED
PRECOMMISSIONINGOFCURRENTTRANSFORMER

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNAME/NO:

DATEOFERECTION: DATEOFENERZIZATION:

EQUIPMENTSERIALNO:RPhase___________YPHASE____________BPHASE______________

Type: MAKE:

DEADTANK: LIVETANK:

RATIOSELECTION: PRIMARY/SECONDARY

Voltagelevel,kV 33 132 220 400

YEAROFMANUFACTURE:

PURCHASEORDERNO:

RATEDDATA&CLASSOFACCURACY:
CORE RATIO BURDEN ACCURACY KNEE POINT
CLASS VOLTAGE(KVP)
WINDINGI
WINDINGII
WINDINGIII
WINDINGIV
WINDINGV

1.0 DETAIL:
SL DESCRIPTION STATUS REMARKS
No YES NO RECORD DEFICENCIES,
IFANY
i). Equipmentiscleanedandfreefrom
Dust/Dirtforeignmaterialsetc.
ii). Equipmentisfreefromallvisible
defectsonphysicalinspection
iii). Checkcttankhasbeenprovided
Withdoubleearthing(deadtankCTs)
iv). CheckthatCTjunctionboxisearthed
v). Allnutsandboltsaretightened
correctlyasperspecifiedtorque
vi). Checktightnessofterminalconnector

Page44of72

vii). AllfittingsasperOutline
GeneralArrangementdrawing.
viii). Levellingandalignmentofstructure
andbaseframeischecked
ix). Erectioncompletioncertificatealong
withlistofoutstandingactivities
Reviewed
x). Anypaintremoved/scratchedin
transithasbeentouchedup
xi). CheckprimarypolarityofCT,s
erectedasperrelevantdrawing.
xii). Checkhermeticallysealingisintact

xiii). Checktheoillevelandleakage
throughanyjoints/Sec.Terminals
xiv). Checkoildrainvalveisproperly
Closedandlocked.
xv). OilLevel&Oilsampling

xvi). N2pressurechecked(whereverapplicable)

xvii). Oillevelontopchambergaugeglass

xviii). BDVofoilsampletakenfromtank
bottomdrainvalve(onlyifNitrogen
Pressureismeasuredzero)
xix). Allthecableidentificationtags
providedandallcoresareprovided
withidentificationferrulesatM.B.
xx). Checksecondarycableendboxis
properlyfixedandensurecableentry
atthebottomandunusedholessealed
xxi). Ensureinterpolecablingiscompleted
Andcheckthecontinuity.
xxii). ChecktheIRvalueofsecondarycable

xxiii). Check external cabling from junction box to

relay/controlpanelcompleted
xxiv). Ensureunusedsecondarycores,
ifany,hasbeenshorted
xxv). Checkstarpointhasbeenformed
properlyandgroundedatoneendonly
xxvi). ChecksparkgapsettinginP1terminal
(whereverprovided/possible)
Permanentpolelevellingand
identificationmarkingsmade
xxvii). CheckTANDELTAtesttapisproperly
earthed
xxviii). Checkthatlugsusedinsecondarycircuitare
ofringtype
xxix). Check direction of PRIMARY (P1/ P2) w.r.t.

Page45of72

 BUS/LINEonerection
xxx). Provisionofbimetallicstrips(Cu+AL)
ensuredwhereverapplicable

2.0 INSULATIONRESISTANCEMEASUREMENT:(USING5KVMEGGER)
SlNo.ofMegger:
Make:
Calibrationvalidupto:_____/______/______
Ambienttemperature:_______0C
RelativeHumidity:
NOTE: A)RemovetheconnectedearthingtosysteminvolvingCTundertest
B)DisconnecttheconnectedterminalsofCTM.Box
C)Permissiblevaluesis1000M.

SL CORE PHASE
No RPhase(M) YPhase(M) BPhase(M)
1 PRIMARYCOREI
2 PRIMARYCOREII
3 PRIMARYCOREIII
4 PRIMARYCOREIV
5 PRIMARYCOREV
6 PRIMARYEARTH

3.0 INSULATIONRESISTANCEMEASUREMENT:(Using500VMegger)
SlNo.ofMegger:
Make:
Calibrationvalidupto:_____/______/______
Ambienttemperature:_______0C
a)
SL CORE PHASE
No RPhase(M) YPhase(M) BPhase(M)
1 COREIEarth
2 COREIIEarth
3 COREIIIEarth
4 COREIVEarth
5 COREVEarth
6 EARTHEarth

b)
SL CORE PHASE
No RPhase(M) YPhase(M) BPhase(M)

Page46of72

 1 COREICOREII
2 COREICOREIII
3 COREICOREIV
4 COREICOREV
5 COREIICOREIII
6 COREIICOREIV
7 COREIICOREV
8 COREIIICOREIV
9 COREIIICOREV
10 COREIVCOREV

4.0 CHECKIRVALUEBETWEENTANDELTAPOINTANDEARTH(AT1KVINSECONDARYBOX)

RPhase________M, YPhase_________M BPhase_________M

5.0 SECONDARYWINDINGRESISTANCE(INOHM)
DetailsofTestingequipment:
Make: Dateoftesting:______/_____/_____
Calibrationvalidupto:_____/______/______
Ambienttemperature:_______0C

CORE TERMINAL RPHASE YPHASE BPHASE
Factory Site Factory Site Factory Site
COREI 1S11S2
1S11S3
1S11S4
COREII 2S12S2
2S12S3
2S12S4
COREIII 3S13S2
3S13S3
3S13S4
COREIV 4S14S2
4S14S3
4S14S4
COREV 5S15S2
5S15S3

Page47of72

 5S15S4

6.0 POLARITYTEST:
(With1.5VDCSupply)
Connect+VEatP1&VeatP2
CORE BETWEEN PHASE
RPhase YPhase BPhase
COREI 1S1(+Ve) 1S2(Ve)
1S1(+Ve) 1S3(Ve)
1S1(+Ve) 1S4(Ve)
COREII 2S1(+Ve) 2S2(Ve)
2S1(+Ve) 2S3(Ve)
2S1(+Ve) 2S4(Ve)
COREIII 3S1(+Ve) 3S2(Ve)
3S1(+Ve) 3S3(Ve)
3S1(+Ve) 3S4(Ve)
COREIV 4S1(+Ve) 4S2(Ve)
4S1(+Ve) 4S3(Ve)
4S1(+Ve) 4S4(Ve)
COREV 5S1(+Ve) 5S2(Ve)
5S1(+Ve) 5S3(Ve)
5S1(+Ve) 5S4(Ve)

7.0 TANDELTAANDCAPACITANCEMEASUREMENT
SlNo.ofTestKit:
Make:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C
a) CAPACITANCEMEASRUEMENT
VOLTAGE CAPACITANCE(MEASUREDVALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2kV

Page48of72

 10kV

b) TANDELTAMEASUREMENT
VOLTAGE TANDELTA(MEASUREDVALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2kV
10kV

8.0 CURRENTRATIOTEST
SlNo.ofTestKit:
Make:
PrimaryCurrentRange: VABurden:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C
a) RPHASE
CORE PRIMARYCURRENT SECONDARY THERITICAL ACTUAL % OF
% ACTUAL CURRENT RATIO RATIO ERROR
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%
COREV 20%
(5S15S2) 40%
80%
COREI 20%
(1S11S3) 40%
80%
COREII 20%
(2S12S3) 40%
80%
COREIII 20%
(3S13S3) 40%

Page49of72

 80%
COREIV 20%
(4S14S3) 40%
80%
COREV 20%
(5S15S3) 40%
80%
COREI 20%
(1S11S4) 40%
80%
COREII 20%
(2S12S4) 40%
80%
COREIII 20%
(3S13S4) 40%
80%
COREIV 20%
(4S14S4) 40%
80%
COREV 20%
(5S15S4) 40%
80%

b) YPHASE
CORE PRIMARYCURRENT SECONDARY THERITICAL ACTUAL % OF
% ACTUAL CURRENT RATIO RATIO ERROR
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%
COREV 20%
(5S15S2) 40%
80%
COREI 20%
(1S11S3) 40%
80%
COREII 20%
(2S12S3) 40%
80%
COREIII 20%
(3S13S3) 40%

Page50of72

 80%
COREIV 20%
(4S14S3) 40%
80%
COREV 20%
(5S15S3) 40%
80%
COREI 20%
(1S11S4) 40%
80%
COREII 20%
(2S12S4) 40%
80%
COREIII 20%
(3S13S4) 40%
80%
COREIV 20%
(4S14S4) 40%
80%
COREV 20%
(5S15S4) 40%
80%

c) BPHASE
CORE PRIMARYCURRENT SECONDARY THERITICAL ACTUAL % OF
% ACTUAL CURRENT RATIO RATIO ERROR
COREI 20%
(1S11S2) 40%
80%
COREII 20%
(2S12S2) 40%
80%
COREIII 20%
(3S13S2) 40%
80%
COREIV 20%
(4S14S2) 40%
80%
COREV 20%
(5S15S2) 40%
80%
COREI 20%
(1S11S3) 40%
80%
COREII 20%
(2S12S3) 40%
80%
COREIII 20%
(3S13S3) 40%

Page51of72

 80%
COREIV 20%
(4S14S3) 40%
80%
COREV 20%
(5S15S3) 40%
80%
COREI 20%
(1S11S4) 40%
80%
COREII 20%
(2S12S4) 40%
80%
COREIII 20%
(3S13S4) 40%
80%
COREIV 20%
(4S14S4) 40%
80%
COREV 20%
(5S15S4) 40%
80%

9.0 MAGNETISINGCURVESPERFORMANCE
KNEEPOINTVOLTAGE(KVp)_______________VOLT
SlNo.ofTestKit:
Make:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C
a) RPHASE
VOLTAGE CURRENTMEASUREMENT(mA)
To be Actual COREI COREII COREIII COREIV COREV
applied Value 1S11S2 2S12S2 3S13S2 4S14S2 5S15S2
0.25xKVP Not to
0.5xKVP apply for
0.75xKVP Metering
1.00xKVP Core
1.10xKVP

b) YPHASE
VOLTAGE CURRENTMEASUREMENT(mA)
To be Actual COREI COREII COREIII COREIV COREV
applied Value 1S11S2 2S12S2 3S13S2 4S14S2 5S15S2
0.25xKVP Not to

Page52of72

 0.5xKVP apply for

0.75xKVP Metering
1.00xKVP Core
1.10xKVP

c) BPHASE
VOLTAGE CURRENTMEASUREMENT(mA)
To be Actual COREI COREII COREIII COREIV COREV
applied Value 1S11S2 2S12S2 3S13S2 4S14S2 5S15S2
0.25xKVP Not to
0.5xKVP apply for
0.75xKVP Metering
1.00xKVP Core
1.10xKVP

NOTE:
1.0CTshouldnotsaturateat110%ofkneepointvoltage(KVp)
2.0 If knee point voltage is not mentioned then knee point current may be taken into
consideration
10.0 CONTACTRESISTANCEMEASUREMENT
DetailsofTestKit:
CONTACTRESISTANCE RPhase() YPhase() BPhase()
AcrossterminalP1
AcrossterminalP2

NOTE : The value of contact resistance should not be more than 10 PER JOINT /
CONNECTOR.
11.0 DGATESTOFCTOIL(AFTERONEMONTHOFCOMMISSIONING)
(Sampletobetakenat250mlbottle)
DISOLVEGAS RPHASE YPHASE BPHASE REMARKS
TotalGas%
H2
CH4
C2H4
C2H6
C2H2
CO
CO2
O2
N2

Page53of72

12.0 FINALDOCUMENTATIONREVIEW:
a) Finaldocumentofprecommissioningchecks
ReviewedandApproved: YES/NO

b) Documentsregardingspares,equipment,O&M
Manualsetc.availableatsiteforo&mpurpose: YES/NO

c) Aftermodification,ifany,"asbuiltdrawings"
areavailableatsite: YES/NO

Signature: Signature: Signature: Signature

Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page54of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED
PRECOMMISSIONINGOFCAPACITORVOLTAGETRANSFORMER

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNAME/NO:

DATEOFERECTION: DATEOFENERZIZATION:

Voltagelevel,kV 132 220 400

DETAILSOFEQUIPMENT:

DESCRIPTION RPHASE YPHASE BPHASE

PURCHASEORDERNO
MAKE
TYPE
SERIALNO
CAPACITANCE(pF)

SECONDARYDETAILS:

DESCRIPTION WINDINGI WINDINGII WINDINGIII

VOLTAGE(V)
VABURDEN(VA)
CLASS
PURPOSE

1.0 DETAILSOFCHECKLIST:

SL DESCRIPTION STATUS REMARKS
No YES NO RECORD DEFICENCIES,
IFANY
i). Equipmentiscleanedandfreefrom
Dust/Dirtforeignmaterialsetc.
ii). Equipmentisfreefromallvisible
defectsonphysicalinspection
iii). CheckCVTtankhasbeenprovided
Withdoubleearthing
iv). CheckthatCVTMarshallingBoxisearthed
v). Allnutsandboltsaretightened
correctlyasperspecifiedtorque
vi). Checktightnessofterminalconnector
vii). AllfittingsasperOutline
GeneralArrangementdrawing.

Page55of72

viii). Levelling and Identification marking is

carriedout.
ix). Levellingandalignmentofstructure
andbaseframeischecked
x). Erectioncompletioncertificatealong
withlistofoutstandingactivities
Reviewed
xi). Anypaintremoved/scratchedin
transithasbeentouchedup
xii). Sl.NoofHVCAPACITORidenticaltothe
Sl.nomentionedonRATING&DIG.PLATE
xiii). Ensure brass vent plug between stacks of
CVT'sisremoved
xiv). Checktheoillevelandleakage
throughanyjoints/Sec.Terminals
xv). Checkoildrainvalveisproperly
Closedandlocked.
xvi). OilLevelontankGaugeGlass
xvii). BDVofoilsampletakenfromtank
bottomdrainvalve
xviii). Checksecondarycableendboxis
properlyfixedandensurecableentry
atthebottomandunusedholessealed
xix). EnsureH.Fterminalofunusedphases
hasbeenearthedandnoloadon
H.Fterminalbushing
xx). CheckRATING/HEALTHINESSofFuses
atCVTM.BandCVTterminalbox.
xxi). Checkthattheneutralpointisearthed
xxii). Ensureinterpolecablingiscompleted
andcheckthecontinuity
xxiii). ChecktheIRvalueofsecondarycable
xxiv). Check external cabling from junction box to
relay/controlpanelcompleted
xxv). Allthecableidentificationtagsprovidedand
all cores are provided with identification
ferrulesatM.B.

2.0 CONTINUITYOFWINDING:
(AfterremovingEarthLink1,2&3)

SlNo BETWEENTERMINAL OK NOTOK
A 1a1n
B 2a2n
C 3a3n

3.0 INSULATIONRESISTANCEMEASUREMENT:(Using5kVMegger)

DetailsofMegger:

Page56of72

 SLNo: Type: Make:

AmbientTemperature:__________0C
SlNo BETWEEN MEASUREDVALUE(M)
RPhase YPhase BPhase
i) PrimarySecondaryCORE1
ii) PrimarySecondaryCORE2
iii) PrimarySecondaryCORE3
iv) PrimaryEarth

4.0 INSULATIONRESISTANCEMEASUREMENT:(Using500VMegger)

DetailsofMegger:
SlNo BETWEEN MEASUREDVALUE(M)
RPhase YPhase BPhase
i) SecondaryCORE1Earth
ii) SecondaryCORE2Earth
iii) SecondaryCORE3Earth
iv) CORE1CORE2
v) CORE1CORE3
vi) CORE2CORE3

5.0 VOLTAGERATIOTEST:

DetailsofTestingInstruments:

PHASE PRIMARY SECONDARYVOLTAGE THEORITICAL ACTUALRATIO %

Between Value RATIO FACTORY SITE ERROR
1a1n
R 2a2n
3a3n
1a1n
Y 2a2n
3a3n
1a1n
B 2a2n
3a3n

NOTE:
1.Applyvoltageoftheorderof500Vormoreacrosslinecapacitor(topflange)toearthlink
2.Ensureallearthlinksconnected

6.0 TANDELTAANDCAPACITANCEMEASUREMENT

SlNo.ofTestKit:
Make:

Page57of72

 SerialNo:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C
a) CAPACITANCEMEASRUEMENT
VOLTAGE CAPACITANCE(MEASUREDVALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2kV
10kV

a) TANDELTAMEASUREMENT
VOLTAGE TANDELTA(MEASUREDVALUE) REMARKS
RPhase YPhase BPhase
FACTORY SITE FACTORY SITE FACTORY SITE
2kV
10kV

7.0 FINALDOCUMENTATIONREVIEW:

d) Finaldocumentofprecommissioningchecks
ReviewedandApproved: YES/NO

e) Documentsregardingspares,equipment,O&M
Manualsetc.availableatsiteforo&mpurpose: YES/NO

f) Aftermodification,ifany,"asbuiltdrawings"
areavailableatsite: YES/NO


Signature: Signature: Signature: Signature
Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page58of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED
PRECOMMISSIONINGOFSURGEARRESTER

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNAME/NO:

DATEOFERECTION: DATEOFENERZIZATION:

Voltagelevel,kV 33 132 220 400

DETAILSOFEQUIPMENT:

DESCRIPTION RPHASE YPHASE BPHASE

PURCHASEORDERNO
MAKE
TYPE
SERIALNO
RATING

1.0 DETAILS:CHECKLIST/TESTING

SL DESCRIPTION STATUS REMARKS

No YES NO RECORD DEFICENCIES,
IFANY
i). Equipmentiscleanedandfreefrom
Dust/Dirtforeignmaterialsetc.
ii). Equipmentisfreefromallvisible
defectsonphysicalinspection
iii). Supportstructureshavebeenprovidedwith
doubleearth
iv). Allnutsandboltsaretightened
correctlyasperspecifiedtorque
v). Equipment erection is complete in all
respect
(ATTACHREMAININGACTIVITIES,IFANY)
vi). Levelling and Identification marking is
carriedout.
vii). Levellingandalignmentofstructure
andbaseframeischecked
viii). Allinsulators&Surgecounterarefreefrom
anyphysicaldefects
ix). Check tightness of all nuts & bolts and
terminalconnector
x). Erection completion certificate along with
listofoutstandingactivities

Page59of72

 reviewed
xi). Checkoneendofsurgecounterisconnected
to the bottom of la stack and one end of
surgecounterhasbeenearth
xii). Thedirectionoftheexhaustventportsaway
from the protected equipment and other
arresterpoles
xiii). Clearance from the arrester to earthed
objects and from the arrester pole to
another arrester pole maintained as per
Outline drawing and all erection has been
doneasperapproveddrawing.
xiv). Check the serial no. and sequence of LA
partsforerectioninmultistackLA
xv). CheckthealignmentofCoronaRing
xvi). Check on charging, the Surge Counter
pointerisingreenzone

2.0 INSULATIONRESISTANCEMEASUREMENT:(Using5kVMegger)

SlNo.ofTestKit:
Make:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C

SlNo BETWEEN PHASE

RPhase(M) YPhase(M) BPhase(M)
st
a 1 StackEarth
b 2ndStackEarth
c 3rdStackEarth
d 4thStackEarth
e 5thStackEarth
f 6thStackEarth

3.0 SURGECOUNTERREADING:

SlNo READING PHASE

RPhase YPhase BPhase
a CounterSerialNo.
b CounterMake
c CounterReading

4.0 CAPACITANCE&TANDELTAMEASUREMENT:

Page60of72

 SlNo.ofTestKit:
Make:
Calibrationvalidupto:_____/______/______
DateofTesting:______/______/______
Ambienttemperature:_______0C
VOLTAGE STACK CAPACITANCE TANDELTA REMARKS
2kV TOP
MIDDLE1
MIDDLE2
BOTTOM
10kV TOP
MIDDLE1
MIDDLE2
BOTTOM

5.0 CHECKINGOFHEALTHINESSOFSURGEMONITOR: OK/NOTOK

6.0 FINALDOCUMENTATIONREVIEW:

g) Finaldocumentofprecommissioningchecks
ReviewedandApproved: YES/NO

h) Documentsregardingspares,equipment,O&M
Manualsetc.availableatsiteforo&mpurpose: YES/NO

i) Aftermodification,ifany,"asbuiltdrawings"
areavailableatsite: YES/NO




Signature: Signature: Signature: Signature
Name: Name: Name: Name:
Designation: Designation: Designation: Designation:
(SupplierRep) ErectionAgency: SiteI/C,AEGCL T&C,AEGCL

Page61of72

 ASSAMELECTRICITYGRIDCORPORATIONLIMITED
PRECOMMISSIONINGOF220kVLINERELAY&CONTROLPANEL

COMMISSIONINGFORMATS

DOCNO: SUBSTATION:

BAYNAME/NO:

DATEOFERECTION: DATEOFENERZIZATION:

Voltagelevel,kV 33 132 220 400

DETAILSOFEQUIPMENT:

Make: YearofManufacture:

PurchaseOrderNo:

TypeofPanel:SwingSimplex/Simplex/Duplex DCAuxiliaryVoltage:

PanelOverallDimensions:

RelaySpecificationsDetails:

Sl RelayType Make Relay Relay Type&Nos.of No.of Nos.of

No Ordering Compatibility Communication Analogue BI&BO
Code Ports Channel
IEC Modbus RJ45 Serial BI BO
61850
1 Main1
2 Main2
3 Line
Differential

1.0 DETAILS:CHECKLIST/TESTING

a. Wiring

Sl As per norms Yes No Remarks

No
1 Wiring done using PVC insulated 650 grade single-
core multi strands annealed copper conductor flexible
wire.
2 2.5 Sqmm Red, Yellow, Blue & Black for CT Circuit
3 2.5 Sqmm Red, Yellow, Blue & Black for PT Circuit
4 2.5 Sqmm for 240V AC circuits
5 1.5 Sqmm Grey for DC circuits

Page62of72

 6 1.5 Sqmm Black for AC circuits

7 2.5 Sqmm Green for Earthing Circuit

b. EARTHING:

Sl As per norms Yes No Remarks

No
1 1 no. Copper Bar of size 25 x 6 mm will be run
throughout the board
2 Earthing between equipments will be looped &
finally terminated in Earth bar
3 Earth bar coupling link of copper will be provided
between adjacent panels

c. AC DISTRIBUTION:

Sl As per norms Yes No Remarks

No
1 Checking of AC Supervision Relay
2

d. DC DISTRIBUTION

Sl As per norms Yes No Remarks

No
1 Checking of DC Supervision Relay
2 Source-1
3 Source-2
4 Changeover between Sources
a) Electro Mechanical switch
b) Through changeover relays

e. VOLTAGE SELECTION RELAYS

Sl As per norms Yes No Remarks

No
1 75 A
2 75 B
3 Check VTSS (BPT-LPT)

Page63of72

 f. METERING CIRCUIT

Sl As per norms Yes No Remarks

No
1 W Meter
2 VAR Meter
3 V Meter
4 A Meter
5 TVM Meter

g. SYNCHRONISING CIRCUIT

Sl As per norms Yes No Remarks

No
1 Bus PT Supply Circuit
2 Line CVT Supply Circuit

h. CT CIRCUIT

Sl As per norms Yes No Remarks

No
1 Metering Circuit
Star Point
Continuity
Earthing should be either at CT JB or at Panel end
2 Main Protection Circuit
Star Point
Continuity
Earthing should be either at CT JB or at Panel end
3 B/U Protection Circuit
Star Point
Continuity
Earthing should be either at CT JB or at Panel end
4 BBP Protection Circuit
Star Point
Continuity
Earthing should be either at CT JB or at Panel end

i. Input Circuit

Page64of72

 Sl As per norms Yes No Remarks

No
1 Main/TBC CB R phase Open
2 Main/TBC CB Y phase Open
3 Main/TBC CB B phase Open
4 Main/TBC CB Ready for A/R
5 Carrier Out of Service

Sl As per norms Yes No Remarks

No
6 External LBB/ A/R Initiation
R phase
Y phase
B phase
7 A/R Switch ON
8 Carrier Channel I Healthy
Carrier Channel II Healthy
9 Carrier Channel I Received
10 SOTF Initiation
11 A/R Block
12 Main CB Open Status
R phase
Y phase
B phase
13 TBC CB Open Status
R phase
Y phase
B phase
14 Main CB Ready for A/R
15 TBC CB Ready for A/R

j. Carrier circuit

Sl As per norms Yes No Remarks

No
1 Carrier Channel I Received
2 Carrier Channel I Healthy
3 Carrier Channel I Send
Carrier Channel II Send
4 Carrier Channel II Received
5 Carrier Channel II Healthy
6 Carrier Channel I Send
Carrier Channel II Send
7 Direct Trip Received
Channel I

Page65of72

 Channel II
8 Direct Trip Send
Channel I
Channel II
9
10

k. Single Phase/ Three Phase Initiation Circuit

Sl As per norms Yes No Remarks

No
1 1 Trip R- : 86 R1
1 Trip Y- : 86 Y1
1 Trip B- : 86 B1
2 1 Trip R- : 86 R2
1 Trip Y- : 86 Y2
1 Trip B- : 86 B2
3 Master Trip Relay : 86 A Optd
Distance Prot Optd.
B/U Protection Optd.
DT Received Ch-I
DT Received Ch-II

Master Trip Relay : 86 B Optd

Distance Prot Optd.
B/U Protection Optd.
DT Received Ch-I
DT Received Ch-II
4 Auxiliary Trip Relay: 86 X (RL-1) Optd.
Auxiliary Trip Relay: 86 X (RL-2) Optd.

l. LBB Trip Relay Circuit

Sl As per norms Yes No Remarks

No
1 LBB -96 Realy Optd.
2 Check all the Trip Extensions as per scheme
i)
ii)
iii)
iv)
v)
vi)

Page66of72

 vii)

m. CB Closing & Manual Trip Circuit

Sl As per norms Yes No Remarks

No
1 DC Supply-1 to CB
DC Supply-2 to CB

2 Auto Reclose/ Remote Close

3 Manual Trip-1 (TC-1)/ (TC-2)

n. CB TC-1 / TC 2 Circuit (Protection Trip/Post Close Supn) & Pre Close

Supervision

Sl As per norms Yes No Remarks

No
1 1- Optd. From Main Prot. Relay

2 Group A Trip Optd.

Group B Trip Optd.

3 LBB/ BB Optd.

4 195 R

195 Y

195 B

o. TTX Contact Multiplication Circuit (Related to TTS)

Page67of72

 Sl As per norms Yes No Remarks

No
1 TTX 1

TTX 2

TTX3

p. TBC TRIPPING CIRCUIT

Sl As per norms Yes No Remarks
No
1 86 A Extension

86 B extension

1- Trip Optd. From Main Protection Relay

R

2 To LBB Initiation TBC

86 R1

86 Y1

86 B1

86 R2

86 Y2

86 B2

q. ISOLATOR CONTROL CIRCUIT

Sl As per norms Yes No Remarks

No
1 89 A Close

Page68of72

 89 A Open

89 B Close

89 B Open

89 C Close

89 C Open

89 D Close

89 D Open

r. INDICATION CIRCUIT
Sl As per norms Yes No Remarks
No
1 CB Open
CB Close
CB Auto Trip
CB Spring Charged
89 A Open
89 B Close
89 B Open
89 BE Close
89 BE Open
89 C Close
89 C Open
89 D Close
89 D Open
89 DE1 Close
89 DE1 Open
89 DE2 Close
89 DE2 Open

2 Line Hot R- Healthy

Line Hot Y- Healthy
Line Hot B- Healthy

s. ANNUNCIATION CIRCUIT
Sl As per norms Yes No Remarks
No
1 DC Fail
2 AC Fail
3 Main Dist Prot. Optd.
4 O/C & E/F Optd.
5 DEF/ SOTF Optd.

Page69of72

 6 Carrier CH-I & II Fail

7 A/R Optd.
8 Power Swing Detected
9 Panel AC Supply Fail
10 LBB/BB Optd.
11 Numerical Relay Faulty
12 DT Received Ch-I & II
13 CB TC-1 faulty
14 CB TC-2 faulty
15 SF6 Low Alarm
16 SF6 Lock Out

t. Main Distance Protection Relay

Sl As per norms Yes No Remarks

No
1 Check CT Circuit (If any Mismatch)

2 Check PT Circuit (If any Mismatch)

3 Zone Reach Test

4 LBB

5 SOTF Optd.

6 Carrier Send

7 A/R
i) AR Optd

Page70of72

 ii) AR Lock Out

iii) AR Blocked

8 Power Swing Detected

9 Carrier Inter-tripping

10 VT Fuse fail

11 Broken Conductor

u. Main Distance Protection Relay & Directional B/U Relay

Sl As per norms Yes No Remarks

No
12 Under Frequency Optd.

13 Over Voltage Optd.

14 Directional B/U Relay

15 Check CT Circuit (If any Mismatch)

16 Check PT Circuit (If any Mismatch)

17 Directionality Test
i) Operating Zone

ii) Non Operating Zone

18 Pick Up Test
19 Operating Timing Check

Page71of72

 20 High Set

v. ISOLATOR INTERLOCK CIRCUIT

Sl As per norms Yes No Remarks

No
1 89 A Interlock

2 89 B Interlock

3 89 BE Interlock

4 89 DE1 Interlock

5 89 DE2 Interlock

6 89 D Interlock

7 89 C Interlock

Page72of72