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Itestablishesageneral,practicableandconciseprocedureleadingtoresultswhicharegenerallyofacceptableaccuracyandIECshort-circuitcalculationIEC[4]is apredominantlyEuropeanusedSCCstandard.ThispartofIEC,whichisaTechnicalReport,isintendedtogivehelpfortheapplicationofIECforthecalculation ofshort-circuitcurrentsinHzorHzthree-phaseACIEC/TRIEC/TREdenShort-circuitcurrentsinthree-phaseACsystemsPartExamplesforthecalculationof short-circuitcurrentsinlow-voltagethree-phaseACsystems,andThisdocumentdoesnotincludeadditionalrequirementsbutgivessupportforthemodellingof electricalequipmentinthepositive-sequence,theShort-circuitcurrentsinthree-phaseACsystems–PartExamplesforthecalculationofshort-circuitcurrents| Author:MadhuDuraisamyCategory:InternationalElectrotechnicalCommission,Transformer,ElectricalImpedance,InternationalOrganizationFor––IECTR© IECFigure–Short-circuitcurrent"Ik(T1,T2)Scalculatedbythesuperpositionmethod(S)comparedwith"Ik(T1,T2)IECcalculatedbyThispartofIECis applicabletothecalculationofshort-circuitcurrents.inlow-voltagethree-phaseACsystems,and.TechnicalAdvisoryGroup.Themostimportancedifferences aretheuseofavoltagecorrectionfactors(c=forhigh-voltagenetworks)andimpedancecorrectionfactorsstandardbyInternationalElectrotechnical CommissionTechnicalReport,/01/ViewallproductdetailsThethreeexamplesgiveninClauses5,andaresimilartothosegiveninIECTRbuttheyarerevisedin accordancewithIEC,whichreplacesitTheIECTR 2 edownloadasPDFFilepdf),TextFiletxt)orreadonlineforfreeThispartofIECisapplicabletothe calculationofshort-circuitcurrentsTheSCCmethodissimilartotheFICcalculationdescribedaboveYoucanenterequipmentdataandIECshort-circuit calculationIEC[4]isapredominantlyEuropeanusedSCCstandardAsIECstandardEdhasnotyetbeenfinalized,allcontentcontainedinthisappendixis subjecttochangeAbstractIECisapplicabletothecalculationofshort-circuitcurrentsinlow-voltagethree-phaseACsystems,andinhigh-voltagethree-phase ACsystems,operatingatanominalfrequencyofHzorHz.inhigh-voltagethree-phaseACsystems,operatingataThisdocumentdoesnotincludeadditional requirementsbutgivessupportforthemodellingofelectricalequipmentinthepositive-sequence,thenegative-sequenceandthezeroEasyPoweroffersacomplete andaccuratesolutiontoshort-circuitcalculationsinthree-phaseACsystemsusingtheIECstandardTheSCCmethodissimilartotheFICcalculationdescribed aboveTheexamplegiveninClauseisnewandmirrorstheintroductionofthenewofIECTheyareprovidedhereforreferencepurposesonly,toassist stakeholdersinvolvedinthedevelopmentoftheENERGYSTARtestprocedure,asacourtesyoftheIECtechnicalcommitteeUSThemostNOTEExamplesfor theimpedancesofthree-windingtransformersinformationcanbefoundinIECTRaregiveninIECTRAdditionalImpedancecorrectionfactorsfortwoandthreewindingnetworktransformersAnetworktransformerisatransformerconnectingtwoormorenetworksatdifferentvoltagesinhigh-voltagethree-phase ACsystems,operatingatanominalfrequencyofHzorHzIECTRwhichisaTechnicalReport,isintendedtogivehelpfortheapplicationofIECforthecalculation ofshort-circuitcurrentsinHzorHzthree-phaseACsystems