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1、ElectricSystemReliabilityIndicesIntroductionTheelectricutilityindustryismovingtowardaderegulated,competitiveenvironmentwhereutilitiesmusthaveaccurateinformationaboutsystemperformancetoensurethatmaintenancedollarsarespentwiselyandthatcustomerexpectationsar
2、emet.Tomeasuresystemperformance,theelectricutilityindustryhasdevelopedseveralperformancemeasuresofreliability.Thesereliabilityindicesincludemeasuresofoutageduration,frequencyofoutages,systemavailability,andresponsetime.Systemreliabilityisnotthesameaspower
3、quality.Systemreliabilitypertainstosustainedinterruptionsandmomentaryinterruptions.Powerqualityinvolvesvoltagefluctuations,abnormalwaveforms,andharmonicdistortions.Aninterruptionofgreaterthanfiveminutesisgenerallyconsideredareliabilityissue,andinterruptio
4、nsoflessthanfiveminutesareapowerqualityconcern.Thiscourseexplainsthereliabilityindicesusedtomeasuredistributionsystemreliability,howtocalculatetheindices,anddiscussessomeofthefactorsthatinfluencetheindices.I.DistributionIndicesTheInstituteofElectricalandE
5、lectronicEngineers(IEEE)definesthegenerallyacceptedreliabilityindicesinits’standardnumberP1366,“GuideforElectricDistributionReliabilityIndices”.IEEE-P1366listsseveralimportantdefinitionsforreliabilityincludingwhataremomentaryinterruptions,momentaryinterru
6、ptionevents,andsustainedinterruptions.MomentaryInterruption-Asingleoperationofaninterruptingdevicethatresultsinavoltagezero.MomentaryInterruptionEvent-Aninterruptionofdurationlimitedtotheperiodrequiredtorestoreservicebyaninterruptingdevice.Thismustbecompl
7、etedwithinfiveminutes.SustainedInterruption–Anyinterruptionnotclassifiedasamomentaryevent.ThemostcommondistributionindicesincludetheSystemAverageInterruptionDurationIndex(SAIDI),CustomerAverageInterruptionDurationIndex(CAIDI),SystemAverageInterruptionFreq
8、uencyIndex(SAIFI),MomentaryAverageInterruptionFrequencyIndex(MAIFI),CustomerAverageInterruptionFrequencyIndex(CAIFI),CustomersInterruptedperInterruptionIndex(CIII),andtheAverageServiceAvailabilityIndex(ASAI).Wewillr
