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1、EngineeringServicesandSystemsCharacteristicsofDifferentPowerSystemsNeutralGroundingTechniques:Fact&FictionByDavidShippCutler-HammerFrankAngeliniCutler-HammerOriginallypresentedattheIEEE1988IndustryApplicationsSocietyTechnicalConferenceinPittsburgh,PATheauthors,arecurrentlyemployedbyCutler-Hammer,aD
2、ivisionofEatonCorporationDavidShippislocatedinWarrendale,PennsylvaniaUSAFrankAngeliniislocatedinPhiladelphia,PAUSACharacteristicsofDifferentPowerSystemsNeutralGroundingTechniques:Fact&FictionD.D.ShippCutler-Hammer,Pittsburgh,Pa.F.J.AngeliniCutler-Hammer,Philadelphia,PAABSTRACTorraceways,whichsystem
3、s"shallbepermittedtobegrounded"aswellastheconditionsinwhichisolationorPowerSystemsGroundingisprobablythemostinsulationmaybesubstitutedforgrounding.misunderstoodelementofanyPowerSystemsdesign.Therefore,thispaperwillreviewthecharacteristicsofThedrivinginfluencewithintheNEC(writtenbythedifferentPowerS
4、ystemsGroundingtechniquesasNationalFireProtectionAssociation)forelectricalsystemcurrentlyapplied--andmisappliedwithinindustrytoday.Ingroundingisbestsummedupbythe2fineprintnotesmanycases,misunderstoodconceptsandperceptionsof(FPN)of"article250-1.Scope"thepurposeandtypeofPowerSystemsGroundingtobeselec
5、teddatesbacktothe1940'sandearlier.Sincethat(FPN):Systemsandcircuitconductorsaretimemuchresearch,coupledwithexperience,hastakengroundedtolimitvoltagesduetolightning,lineplacethatisnowavailabletoindustry.Thispaperwillsurges,orunintentionalcontactwithhighervoltagereviewthemanydifferentsystemgroundingp
6、racticesandlines,andtostabilizethevoltagetogroundduringpresentinformationondifferentgroundingmethods.normaloperation.SystemsandcircuitconductorsSafety,NationalElectricCoderequirements,andaresolidlygroundedtofacilitateovercurrentdeviceoperationalconsiderations,suchascontinuityofservice,operationinca
7、seofgroundfaults.willbeinvestigated.Finally,examplesofproperapplicationswithinvariousindustrieswillbegiven.(FPN):Conductivematerialsenclosingelectricalconductorsorequipment,orformingpartofsuchINTRODUCTIONeq
