pre-commissioning tests for ac side of solar power plant
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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