pre-commissioning tests for ac side of solar power plant

S.NO. EQUIPMENTDETAILS TESTDETAILSINSULATIONRESISTANCETESTPITESTVOLTAGERATIO&TAPCONTINUITYTESTMAGNETICBALANCETESTVECTORGROUPTESTWINDINGRESISTANCE(HVSIDE)ATALLTAPSWINDINGRESISTANCE(LVSIDE)ATALLTAPSMAGNETIZATIONCURRENTTESTBDVOFTRANSFORMEROIL(AndOilFilterization)TANᵹ&CAPACITANCECHECKSOLTCoperationaltestCheckingof:1)Valvesposition(on/off),2)Gasketjointstoavoidoilleakage,3)Earthing

CONFIRMITYTEST(1)Visualexternaldamagetoanypartofthetransformer(2)Buchholzalaram+tripcontacts(3)WTI&OTIalaram+tripcontacts(4)MOGcontacts(5)PhaseSequenceCheck(6)colourofsilicagel/Oillevel/leakage,ifany(7)Abnormality,ifany.

INSULATIONRESISTANCETESTPITESTVOLTAGERATIO&TAPCONTINUITYTESTMAGNETICBALANCETESTVECTORGROUPTESTWINDINGRESISTANCE(HVSIDE)ATALLTAPSWINDINGRESISTANCE(LVSIDE)ATALLTAPSMAGNETIZATIONCURRENTTESTBDVTESTOFTRANSFORMEROIL(AndOilFilerataion)Checkingof:1)Valvesposition(on/off),2)Gasketjointstoavoidoilleakage,3)EarthingCONFIRMITYTEST(1)Visualexternaldamagetoanypartofthetransformer(2)Bucholzalaram+tripcontacts(3)WTI&OTIalaram+tripcontacts(4)MOGcontacts(5)PhaseSequenceCheck(6)colourofsilicagel/Oillevel/leakage,ifany(7)Abnormality,ifany.INSULATIONRESISTANCETESTPITESTVOLTAGERATIO&TAPCONTINUITYTESTMAGNETICBALANCETESTVECTORGROUPTESTWINDINGRESISTANCE(HVSIDE)ATALLTAPSWINDINGRESISTANCE(LVSIDE)ATALLTAPSMAGNETIZATIONCURRENTTESTBDVTESTOFTRANSFORMEROIL

LISTOFPRE-COMMISSIONINGTESTSOFACEQUIPMENTS

POWERTRANSFORMER1

INVERTERTRANSFORMER2

3 Auxiliarytransformer

CONFIRMITYTEST(1)Visualexternaldamagetoanypartofthetransformer(2)PhaseSequenceCheck(3)colourofsilicagel/Oillevel/leakage,ifany(4)Abnormality,ifany.

PHYSICALCHECKINGOFVARIOUSELECTRICAL&MECHANICALPARTS

CONTINUITY&CONTROLCIRCUITCHECK11kVVCB

IRTest(1)CloseCondition(RY,YB,BR,RE,YE,BE)(2)OpenCondition(RR',YY',BB')ContactResistanceTestTimingTest(1)Opentime(2)ClosetimeCoilresistancetest(1)Closingcoil(2)Trippingcoil-1(3)Trippingcoil-2(4)Motorwinding

ControlCircuit&Operationalchecks(1)Manualchargingofspring(2)Mechanicalclosing&tripping(3)Chargingofspringthroughmotor(4)Trippingthroughrelays/releases(5)Breakerclosecommandblockingwhenrelay/releasesisinoperatedcondition(6)Abnormality,ifany

Maintenance&generalcheck-ups(1)Inspectionforphysicaldamage(2)cleaning&tightnessofbreakerbolts(3)Alignmentofbreaker(4)Earthingconnection(5)Gaspressurelowoperation(6)Abnormality,ifany

CTIRTEST(P-E,S-E,P-S,S-S)WindingResistanceTestMagnetizationcharacteristiccheckRatio,Polarity&CircuitcheckGeneralchecks1)Inspectionforphysicaldamage2)Continuitycheckforammeterand/orrelaycircuits

PTIRTEST(P-E,S-E,P-S,S-S)WindingResistanceTestRatio,Polarity&CircuitcheckGeneralchecks1)Inspectionforphysicaldamage2)ContinuitycheckforVoltmeterand/orrelaycircuits

LBSIRTESToneachpoleMeasurementofcontactresistanceforallthreephasesManualcheckingofoperation(closeoropen)byHandleCheckingofInterlocks(mechanicalandelectrical)HVDCTestBusBars:-1)IRTEST2)ContactResistanceTestCHECKUPOFALLALARAMSANDANNUNCIATION

SPACEHEATEROPERATIONCHECK

INTERFACECHECKBETWEENPANELS

TESTSOFPROTECTIVERELAYSONSETTINGSCONFIGURED

11KVHTPANELS,RMUPANELS,C&RPANEL,RTCC

PANEL

MULTIFUNCTIONRELAYS

3 Auxiliarytransformer

4

NUMERICALRelay1)SecondayInjectionTest(accordingtoservicesettingofrelay)a)TimeCurrentcharacteristicstestsforO/Cunitb)InstantaneousO/Cunitprotectionc)TimeCurrentcharacteristicstestsforE/Funitd)InstantaneousE/Funitprotection

2)GeneralChecks:-Inspectionforphysicaldamage,wiringcheck,ResettingofLEDswithcover

TRIPPINGRelay(86,NumericalRelay)

1)Insulationresistancetest(betweenallterminalsandbody,betweenvariousciruits)

2)CoilResistanceTest3)CoilPickup&dropofftest

4)GeneralCheck:-Inspectionforphysicaldamage,wiringcheckofrelay,cleaning&pressureofrelaycontacts,Flagoperationandresettingofflagswithcover

DIFFERENTIAL(Numerical)Relay(87T)1)DifferentialPick-upcheck2)StabilityCheck3)SecondaryInjectionTesta)TimeCurrentcharacteristicstestsforO/Cunitb)InstantaneousO/Cunitprotectionc)TimeCurrentcharacteristicstestsforE/Funitd)InstantaneousE/Funitprotection4)OverFluxing5)UnderVoltageunittest6)OverVoltageunittest7)RestrictedE/FProtection(HTSide)8)RestrictedE/FProtection(LVSide)9)GeneralCheckup:-Inspectionforphysicaldamage,wiringcheckofrelay,LEDindication&Pushbuttonoperation,Servicesettingre-storedAuxiliaryRelay(ElectromechanicalRelay)1)Insulationresistancetest(betweenallterminalsandbody,betweenvariousciruits)2)CoilResistanceTest3)CoilPickup&dropofftest4)GeneralCheck:-Inspectionforphysicaldamage,wiringcheckofrelay,cleaning&pressureofrelaycontacts,Flagoperationandresettingofflagswithcover

MULTIFUNCTIONRELAYS

4

IRTest(1)CloseCondition(RY,YB,BR,RE,YE,BE)(2)OpenCondition(RR',YY'.BB')

ContactResistanceTestTimingTest(1)Opentime(2)Closetime

Coilresistancetest(1)Closingcoil(2)Trippingcoil-1(3)Trippingcoil-2(4)Motorwinding

ControlCircuit&Operationalchecks(1)Manualchargingofspring(2)Mechanicalclosing&tripping(3)Chargingofspringthroughmotor(4)Trippingthroughrelays/releases(5)Breakerclosecommandblockingwhenrelay/releasesisinoperatedcondition(6)Abnormality,ifany

Maintenance&generalcheck-ups(1)Inspectionforphysicaldamage(2)cleaning&tightnessofbreakerbolts(3)Alignmentofbreaker(4)Earthingconnection(5)Gaspressurelowoperation(6)Abnormality,ifany7)testforleakageofair/gas

InsulationResistance(R-E,Y-E,B-E)ContactResistanceTestCheckingofmechanicalinterlokbetweenIsolator&Earthswitch(ifthemodelisIsolatorwithEarthswitch)OpretionalChecks(1)MechanicalCheck(2)ElectricalCheck(theoperatingmechanismofthe3polesshallbewellsynchronized)InsulationResistance(P-E)CounterTest

Maintenance&Generalcheck-ups(1)Inspectionforphysicaldamage(2)Cleaning&tightnessofbolts(3)Earthingconnection(4)Abnormality,ifany

IRTEST(P-E,S-E,P-S,S-S)WindingResistanceTestMagnetizationcharacteristiccheckRatio,Polarity&Circuitcheck

Generalchecks1)Inspectionforphysicaldamage2)Continuitycheckforammeterand/orrelaycircuits

IRTEST(P-E,S-E,P-S,S-S)WindingResistanceTestRatio,Polarity&CircuitcheckGeneralchecks1)Inspectionforphysicaldamage2)ContinuitycheckforVoltmeterand/orrelaycircuitsIRTEST(P-E,S-E,P-S,S-S)WindingResistanceTestRatio,Polarity&Circuitcheck

7 LA

HorizontalMountedDoubleBreakIsolator&Earthswitch

6

CT8

PT9

5 SF6CIRCUITBREAKER

CVT10

CapacitancemeasureofcapacitorsectionGeneralchecks1)Inspectionforphysicaldamage2)ContinuitycheckforVoltmeterand/orrelay

11 INSULATORS HIGHVOLTAGETESTPHYSICALCHECKINGOFLAYING&TERMINATIONCONTINUITYTESTINSULATIONRESISTANCETESTPIVALUEHIGHVOLTAGETEST(DC/AC)PHYSICALCHECKINGOFLAYING&TERMINATIONCONTINUITYTESTINSULATIONRESISTANCETESTEARTHRESISTANCETESTPHYSICALCHECKINGOFCONNECTIONSCONTINUITYOFGROUNDINGCONNECTIONS&JOINTSCHECKINGOFCOMPLETEEARTHINGNETWORKCheckingofinterpanelwiring,protectionrelays,terminalblockcontacts,earthingEnsuringtheinterlockbetweenIsolators&SF6circuitbreakerIRtestbetweenControl,CT,PTcircuits&earth

16 Battery,Batterycharger&DCDB

Checkingofconnections,physicaldamage,voltageatoutputterminals

17 UPS&Battery Checkingofconnections,physicaldamage,voltageatoutputterminals18 PLCC,Wavetrap Checkingofconnections,earthing

C&RPanel15

14 EARTHING

LTCABLES13

12 HTCABLES

CVT10