FallDielectricTestTablesAgendaamp;Presentation秋季介电测试表议程amp；演讲

LiquidDielectricTestTablesTaskForce(C57.12.00)Rev17Porto,PortugalOctober7,2021AGENDA 1.

Introductions

2.

Mission&Scope 3.Minutes&ReviewfromMarchCharlotteMeeting

4.DocumentStatus

A.PresentForm

B.C57.12.00RwithproposedTextrevisions

6.FutureConsiderations:ProposedisbandingTaskforce

7.DiscussionandAdjournmentLiquidDielectricTestTablesTaskForce(C57.12.00)LiquidDielectricTestTablesTaskForce(C57.12.00)CleanUpInconsistenciesHarmonizewithIEC76-3ProvideReferenceConsiderationsSimplifyTablesMission&ScopeLiquidDielectricTestTablesTaskForce(C57.12.00)IEEEC57.12.00/12.01/IEC76-3DielectricTestTables:CommentsandProposedDispositionTableIIITestValuesForRepairedTransformersTransformersinthefielddonotgetimpulsetests.

Transformersthatarereturnedtothefactorywithfieldservicearetobetestedat85%ofthenewvalues.Transformersthathaveminorrepairsorwhereonlyonecoilisreplacedgenerallyarealsotestedto85%ofthenewvalues.

Transformerswhere2ormorecoilsarereplacedaregenerallytestedtofullratedvalues.

Thereisnaturallyarequirementforagreementbetweenpurchaserandsupplier.

FutureDirectionforTaskforce:PlaceTaskForceonidlewhileC57.12.00Risballoted.AddressissuesinC57.12.00thatarereferredbacktoTaskforce.DisbandTaskforceatSpring2021meetinginMiami.SummaryofBlume’sDielectricRelationshipsofTestValvestoSystemVoltagein19371. LowFrequency2. HighFrequency1MinutewithstandvoltageInfinitetimewithstandvoltage1.5Fullwavewithstand1.5x40µsec60Hzwithstand2.2-3.01timeFullwavewithstandMultiplestrokes1.25(Page388*)(Page473*)(Page476*)*TransformerEngineering:ATreatiseontheTheory,OperationandApplicationofTransformersByL.F.Blume,,G.Camilli,A.BoyajianandV.M.Montsinger.©1938JohnWileyandSons,Inc.MinimumBILSelectionfromSurgeArresterCharacteristicsV1V2ArresterprotectionlevelVarresterprotectionleveltoVMXL-GFromBlume:MinimumBIL=1.25XV2VMXL-GGroundedWye-ConnectedArresterdApplicationChartInAccordancewithC62.2MethodsCourtesyofMikeComber,OhioBrassCo.Rev.:0Date:11/2/991)ShieldedSystemsuse10kAdischargevoltageprotectionlevels2)UnshieldedSystemsuse40kAdischargevoltageprotectionlevels3)Transmissionandsubtransmissionsystemsareshielded,havingtheneutral(ground)leadphysicallylocatedabovethelineleads.4)Distributionsystemsthrough69kVarenormallyunshieldedwiththeneutrallocatedbelowthelineleads.Delta-ConnectedArresterdApplicationChartInAccordancewithC62.2MethodsCourtesyofMikeComber,OhioBrassCo.Rev.:0Date:11/2/991)ShieldedSystemsuse10kAdischargevoltageprotectionlevels2)UnshieldedSystemsuse40kAdischargevoltageprotectionlevels3)Transmissionandsubtransmissionsystemsareshielded,havingtheneutral(ground)leadphysicallylocatedabovethelineleads.4)Distributionsystemsthrough69kVarenormallyunshieldedwiththeneutrallocatedbelowthelineleads.PorcelainHousedStationClassArrestersDynaVarTypeVH5HeavyDutyStationClassGappedMetal-OxideSurgeArresters(DoubleColumnofValueElements)1)Maximumdischargevoltageforanimpulsecurrentwavewhichproducesavoltagewavecreatinga50.5s.Dischargecurrentsare15kVAfor304=340MCOVand30kAfor462MCOV.Thiscanbeusedforcoordinationwherefront-of-wavesparkoverformerlywasused.2)Dischargevoltageof3kAforasurgeof45stimetocrest.BACKGROUNDINFORMATIONGeorgeIliffReference(BonnevillePower)LowFrequencyTests-InduceandAppliedFigure1-VoltageRelationhipsonfaultedwindingsVTest=2xVsystemA-NORMALB-

FAULTONUNGROUNDEDSYSTEMC-

FAULTONEFFECTIVELYGROUNDEDSYSTEMNOTE:“G’REFERSTOTHEGROUNDVOLTAGEATTHETRANSFORMER,RELATIVETOTHELINETERMINALVOLTAGES.THISDETERMINESTHECOLTAGEIMPOSEDONTHETRANSFORMERINSULATION.100%H258%GH3H1H