IEEEStd1366-XXXXIEEEGuideforElectricPowerDi

IEEEGuideforElectricPowerDistributionReliabilityIndicesSponsoredbytheTransmissionandDistributionCommitteeIEEE3ParkAvenueNewYork,NY10016-5997USA31May2012IEEEPower&EnergySocietyIEEEStd1366™-2012(RevisionofIEEEStd1366-2003)445HoesLane,Piscataway,NJ08854USA||Tel.[phone]Fax[phone]ThisisaRedlineDocumentproducedbyTechstreet,abusinessofThomsonReuters.Thisdocumentisintendedtoprovideuserswithanindicationofchangesfromoneeditiontothenext.Itincludesafull-textversionofthenewdocument,plusanindicationofchangesfromthepreviousversion.Redlinesaredesignedtosavetimeandimproveefficienciesbyusingthelatestsoftwaretechnologytofindandhighlightdocumentchanges.Moreprofessionalsareusingvaluablenewtechnologieslikeredlines,tohelpimproveoutcomesinafastpacedglobalbusinessworld.Becauseitmaynotbetechnicallypossibletocaptureallchangesaccurately,itisrecommendedthatusersconsultpreviouseditionsasappropriate.Inallcases,onlythecurrentbaseversionofthispublicationistobeconsideredtheofficialdocument.RedlineProcessingNotes:1.RedText-Redstrikethroughtextdenotesdeletions.2.BlueText-Blueunderlinedtextdenotesmodificationsandadditions.IEEEStd1366™-2012(RevisionofIEEEStd1366-2003)IEEEGuideforElectricPowerDistributionReliabilityIndicesSponsorTransmissionandDistributionCommitteeoftheIEEEPower&EnergySocietyApproved14May2012IEEE-SAStandardsBoardAbstract:Distributionreliabilityindicesandfactorsthataffecttheircalculationsaredefinedinthisguide.Theindicesareintendedtoapplytodistributionsystems,substations,circuits,anddefinedregions.Keywords:circuits,distributionreliabilityindices,distributionsystems,electricpower,IEEE1366,reliabilityindices•TheInstituteofElectricalandElectronicsEngineers,Inc.3ParkAvenue,NewYork,NY10016-5997,USACopyright©2012byTheInstituteofElectricalandElectronicsEngineers,Inc.Allrightsreserved.Published31May2012.PrintedintheUnitedStatesofAmerica.IEEEisaregisteredtrademarkintheU.S.Patent&TrademarkOffice,ownedbyTheInstituteofElectricalandElectronicsEngineers,Incorporated.PDF:ISBN978-0-7381-7275-0STD97250Print:ISBN978-0-7381-7381-8STDPD97250IEEEprohibitsdiscrimination,harassment,andbullying.Formoreinformation,visit:IEEEStandardsdocumentsaredevelopedwithintheIEEESocietiesandtheStandardsCoordinatingCommitteesoftheIEEEStandardsAssociation(IEEE-SA)StandardsBoard.IEEEdevelopsitsstandardsthroughaconsensusdevelopmentprocess,approvedbytheAmericanNationalStandardsInstitute,whichbringstogethervolunteersrepresentingvariedviewpointsandintereststoachievethefinalproduct.VolunteersarenotnecessarilymembersoftheInstituteandservewithoutcompensation.WhileIEEEadministerstheprocessandestablishesrulestopromotefairnessintheconsensusdevelopmentprocess,IEEEdoesnotindependentlyevaluate,test,orverifytheaccuracyofanyoftheinformationorthesoundnessofanyjudgmentscontainedinitsstandards.UseofanIEEEStandardiswhollyvoluntary.IEEEdisclaimsliabilityforanypersonalinjury,propertyorotherdamage,ofanynaturewhatsoever,whetherspecial,indirect,consequential,orcompensatory,directlyorindirectlyresultingfromthepublication,useof,orrelianceuponanyIEEEStandarddocument.IEEEdoesnotwarrantorrepresenttheaccuracyorcontentofthematerialcontainedinitsstandards,andexpresslydisclaimsanyexpressorimpliedwarranty,includinganyimpliedwarrantyofmerchantabilityorfitnessforaspecificpurpose,orthattheuseofthematerialcontainedinitsstandardsisfreefrompatentinfringement.IEEEStandardsdocumentsaresuppliedASIS.TheexistenceofanIEEEStandarddoesnotimplythattherearenootherwaystoproduce,test,measure,purchase,market,orprovideothergoodsandservicesrelatedtothescopeoftheIEEEstandard.Furthermore,theviewpointexpressedatthetimeastandardisapprovedandissuedissubjecttochangebroughtaboutthroughdevelopmentsinthestateoftheartandcommentsreceivedfromusersofthestandard.EveryIEEEstandardissubjectedtoreviewatleasteverytenyears.Whenadocumentismorethantenyearsoldandhasnotundergonearevisionprocess,itisreasonabletoconcludethatitscontents,althoughstillofsomevalue,donotwhollyreflectthepresentstateoftheart.UsersarecautionedtochecktodeterminethattheyhavethelatesteditionofanyIEEEstandard.Inpublishingandmakingitsstandardsavailable,IEEEisnotsuggestingorrenderingprofessionalorotherservicesfor,oronbehalfof,anypersonorentity.NorisIEEEundertakingtoperformanydutyowedbyanyotherpersonorentitytoanother.AnypersonutilizinganyIEEEStandardsdocument,shouldrelyuponhisorherownindependentjudgmentintheexerciseofreasonablecareinanygivencircumstancesor,asappropriate,seektheadviceofacompetentprofessionalindeterminingtheappropriatenessofagivenIEEEstandard.Translations:TheIEEEconsensusdevelopmentprocessinvolvesthereviewofdocumentsinEnglishonly.IntheeventthatanIEEEstandardistranslated,onlytheEnglishversionpublishedbyIEEEshouldbeconsideredtheapprovedIEEEstandard.OfficialStatements:As