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1、1036IEEETRANSACTIONSONPOWERDELIVERY,VOL.25,NO.2,APRIL2010TemporaryOvervoltageandGPRCharacteristicsofDistributionFeedersWithMultigroundedNeutralJanakR.Acharya,StudentMember,IEEE,YunfeiWang,StudentMember,IEEE,andWilsunXu,Fellow,IEEEAbstract—Three-phasefour-wiremultigroundedneutralMGNschemes.Suchsimul
2、ation-basedapproacheshaveamain(MGN)isthepreferreddistributionlineconfigurationinNorthdrawback-theycannotunfoldthemechanismsleadingtotheAmerica.Itsperformancecharacteristics,suchastemporaryTOVandGPRphenomenaandcannotprovideintuitiveunder-overvoltage(voltageswell)andgroundpotentialrise(GPR),arestandin
3、gontheinteractionofvariousfactors.Analyticalinves-difficulttounderstandandassessduetothepresenceofaneutralconductorandtheconductor’smultiplegroundingnature.Thetigationsarenecessarytocompensatetheshortcomingsofthecharacteristicsarefurtheraffectedbyuniqueparameters,suchassimulationmethods.However,rese
4、archworkdoneintheana-groundingintervalsandthecouplingbetweenneutralandphaselyticalaspectislimited.Anattempttoanalyticalpredictionofconductors.Thispaperconductsanalyticalstudiesonthephe-temporaryovervoltageswasmadein[11]recently,butthestudynomenaoftemporaryovervoltageandGPRassociatedwithMGNwasconfine
5、dtoungroundedsystems.In[12],Leveyrepresentedconfigurations.Thepurposeistorevealthemechanismsleadingtothephenomenaandtheircontributingfactors.Approximatethemultigroundedneutralbyathree-terminalcircuittofindformulaearederivedtoquantifytheimpactofvariousfactors.theline-to-neutralfaultcurrentforasingle-p
6、hasecircuitandThefindingsareconfirmedbythesimulationresults.thismodelwasusedin[13]tocomputethevoltagesofmulti-IndexTerms—Groundpotentialrise,grounding,multigroundedgroundedcable.Later,heexpandedthemodelformultiphaseneutral,temporaryovervoltage.circuitin[14]forTOVandGPRcalculations.NeutralcurrentandGP
7、Rdistributionwasalsoobtainedbyusingacomputeral-gorithm.However,themethodsfailedtorevealtheimpactofin-I.INTRODUCTIONdividualneutralparameters.In[2],LatalsopresentedanalyticalULTIGROUNDEDneutraldistributionsc
