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StandardnameStandardNumberAbstractLow-voltagesurgeprotectivedevices–Part32:Surgeprotectivedevicesconnectedtothed.c.sideofphotovoltaicinstallations–SelectionandapplicationprinciplesIEC61643-32Componentsforlow-voltagesurgeprotectivedevices–Part351:Performancerequirementsandtestmethodsfortelecommunicationsandsignallingnetworksurgeisolationtransformers(SIT)IEC61643-351Componentsforlow-voltagesurgeprotection–Part352:Selectionandapplicationprinciplesfortelecommunicationsandsignallingnetworksurgeisolationtransformers(SITs)IEC61643-352IEC61643-32describestheprinciplesforselection,installationandcoordinationofSPDsintendedforuseinPhotovoltaic(PV)systemsupto1500VDCandfortheACsideofthePVsystemratedupto1000Vrms50/60Hz.ThephotovoltaicinstallationextendsfromaPVarrayorasetofinterconnectedPV-modulestoincludetheassociatedcablingandprotectivedevicesandtheinverteruptotheconnectionpointinthedistributionboardortheutilitysupplypoint.ThispartofIEC61643considersSPDsusedindifferentlocationsandindifferentkindsofPVsystems:PVsystemslocatedonthetopofabuilding.PVsystemslocatedonthegroundlikefreefieldpowerplantscharacterizedbymultipleearthingandameshedearthingsystem.ThetermPVinstallationisusedtorefertobothkindsofPVsystems.ThetermPVpowerplantisonlyusedforextendedfree-fieldmulti-earthedpowersystemslocatedontheground.ForPVinstallationsincludingbatteriesadditionalrequirementsmaybenecessary.ThecontentsofthecorrigendumofJune2019havebeenincludedinthiscopy.IEC61643-351denestestcircuitsandtestmethodsfordeterminingandverifyingtheSITsurgeparameters.Preferredperformancevaluesforkeyparametersaregiven.Surgeisolationtransformers(SITs)areusedforsignaltransformerapplicationswithsignallevelsupto400Vpeaktopeak.SITsaretransformers,withorwithoutaninternal-windingscreen,witharatedimpulsewithstandvoltagegreaterthanthepeakvoltageoftheexpectedcommon-modesurgeenvironment.SITsareapplicabletocomponentsforsurgeprotectionagainstindirectanddirecteffectsoflightningorothertransientovervoltage.SITsareusedtomitigatetheonwardpropagationofcommon-modevoltagesurges.ThispartofIEC61643doesnotcoverSIToperationunderdifferential-modelightningsurgeconditions.Keywords:Surgeisolationtransformers(SITs)IEC61643–352coverstheapplicationofsurgeisolationtransformers(SITs)thatareusedintelecommunicationtransformerapplicationswithsignallevelsupto400Vpeaktopeak.Thesetransformershaveahighratedimpulsevoltagewithorwithoutscreenbetweentheinputandoutputwindings.SITsarecomponentsforsurgeprotectionandareusedtomitigatetheonwardpropagationofcommon-modevoltagesurges.ThisdocumentdescribesSITs’selection,applicationprinciplesandrelatedinformation.Thisdocumentdoesnotcoverpowerlinecommunicationtransformers.Low-voltageelectricalinstallations–Part4-44:Protectionforsafety–ProtectionagainstvoltagedisturbancesandelectromagneticdisturbancesIEC60364-4-44:IEC60364-4-442018isintendedtoproviderequirementsforthesafetyofelectricalinstallationsintheeventofvoltagedisturbancesandelectromagneticdisturbancesgeneratedfordifferentspeciedreasons.Thisconsolidatedversionconsistsofthesecondedition(2007),itsamendment1(2015)anditsamendment2(2018).Therefore,noneedtoorderamendmentinadditiontothispublication.112
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