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1、ESL-IE-95-04-31DESIGNCONCEPTSFORPOWERDISTRIBUTIONEQUIPMENTSERVINGNON-LINEARLOADSGregoryW.Massey,P.E.ElectricalEngineerU.S.GeneralServicesAdministrationKansasCity,MissouriABSTRACTSYMMETRICALCOMPONENTANALYSISThispaperexplorestheeffectsofpowersystemThephasecurrentsonabala
2、nced,three-phase,harmonicsinducedbynon-sinusoidalloadsonfour-wire,grounded-neutraldistributionsystem,electricaldistributionequipment.Thefirstportionseparatedby120°andequalinmagnitude,addexaminestheharmonicphenomenontomorefullyvectoriallyandcancelinthegrounded-neutralun
3、derstandharmoniccurrentbehaviorfromanconductor.Thus,noneutralcurrentflows.Oneofintuitivepointofview.Thesecondportionoutlinesthemostdangerousandmostcuriouscharacteristicsthehazardouseffectharmoniccurrentshaveonofnon-linearloadsisthatharmoniccurrentsflowinpowersystemcomp
4、onentsandprovidesguidancefortheneutralconductorregardlessofloadbalance.non-sinusoidalloaddistributionsystemdesign.Untilrecently,littleunderstandingofthiscuriosityNOTE:Theviewsexpressedinthispaperdonothasbeengainedbytheengineeringcommunity.Thenecessarilyrepresenttheview
5、softheUnitedStatesofprinciplesbehindthisphenomenoncanbemostAmericaortheU.S.GeneralServicesreadilyseenthroughtheempiricalapplicationofAdministration.symmetricalcomponentanalysistoharmonicloadcurrents(15).INTRODUCTIONTheconcernregardingpowersystemharmonicSymmetricalcompo
6、nentsisameansofcurrentshasgrowninrecentyearswiththeincreasedmathematicallyresolvingasystemofunbalanceduseofelectronic-basedpowersuppliesforphasorsbytheuseofanequalnumberofbalancedphotocopiers,personalcomputers,andlaserprinters,componentsetsthatcanbevectoriallyaddedtoge
7、therandwiththeincreaseduseofelectroniclightingtoobtaintheoriginalsetofunbalancedphasors.ballasts,uninterruptiblepowersupplies,andvariableAccordingtoFortescue'sTheorem(5),thefrequencyACmotordrives.Electronic-basedunbalancedphasorsofathree-phasesystemcanbeequipmentdrawsa
8、distorted,non-sinusoidalcurrentresolvedintothreebalancedsystemsofphasors;thewaveform.Non-sinusoidal,ornon-linearloads
