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1、RogowskiCoilTransientPerformanceandATPSimulationsforApplicationsinProtectiveRelayingLj.A.Kojovic,Seniormember,IEEEAbstract-ThispaperpresentsATPmodelingofRogowskicoilsII.CURRENTTRANSFORMERTRANSIENTPERFORMANCEforprotectionsystemapplications.Characteristict
2、estcaseshavebeendevelopedandtheresultspresented.SimulationresultsIron-coretransformers(power,voltage,andcurrentinstrumentwerealsocomparedtoconventionalcurrenttransformertransformers)havenon-linearmagnetizingreactance.Powertransientbehavior.andvoltageinst
3、rumenttransformersareconnectedinparallelwiththeloadwhileCTsareconnectedinserieswiththeload.Keywords:RogowskiCoil,CurrentTransformer,ProtectiveRelaying,TransientStudy,DigitalSimulationSincepowersystemsareoperatedwithinarangeof±5%nominalvoltage,powerandvol
4、tageinstrumenttransformersaredesignedtooperateclosetothesaturationvoltage(FigureI.INTRODUCTION1).However,undersomeoperatingconditions,voltagescanincreaseandcausesaturation.FerroresonancecanbeinitiatedTraditionalelectromechanicalandmicroprocessorprotectio
5、nwhenovervoltagesoccur.relaysprocesssignalsprovidedbyironcorevoltageandcurrenttransformers(VTsandCTs),requiringanumberofSaturationvoltageNon-Linearregionprotectiveandcontroldevices,measuringequipmentandextensivewiring.Thesedesignsareinflexibleifadjustmen
6、tsareneededtoaccommodateloadandpowersystemOperatingpointconfigurationchanges.Inaddition,complexperiodictestingforvoltagetransformersVoltageandmaintenanceproceduresarenecessary.Inspiteofbestengineeringefforts,attimesrelaysystemmisoperationoccursLinearregi
7、onduetothecomplexityoftheprotectionscheme(e.g.,wrongwiringafterperiodictesting,wrongrelaysetting),theeffectsofexternalmagneticfields,andCTsaturation,especiallyinOperatingpointdifferentialschemes.Evenprotectionsystemsusingforcurrenttransformersmultifuncti
8、onrelaysaresusceptibletotheseproblems.WhenaprotectiondevicebecomesinoperativeanddoesnotinitiateCurrentbreakertrippingduringthefault,backupprotectionisFigure1.V-ICurveandOperatingPointsforCurrentandVoltageTransformersprovid
