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1、ImprovingReliabilityforPowerSystemProtectionS.WardT.DahlinW.HiginbothamRFLElectronicsInc353PowervilleRoadBoontonTwp,NJ07005Presentedtothe58thAnnualProtectiveRelayConferenceAtlanta,GAApril28-30,20041ImprovingReliabilityforPowerSystemProtectionS.WardT.DahlinW.Higinbo
2、thamRFLElectronicsInc353PowervilleRoadBoontonTwp,NJ07005AbstractReliabilityisalwaysaconcernforprotectiverelaysystems.Reliabilityisacompromisebetweensecurityanddependability.Securityistheabilitytoproperlyrestrainfromtrippingwhennotcalledfor.Dependabilityistheability
3、totripwhenrequired.Whilesecurityisnotimprovedbyincreasedredundancy,dependabilityis.Clearly,theimpactonthepowersystemwhenaprotectiondeviceisnotfunctioningwhenrequiredismuchlessseverewhenthereisaredundantdevicethattakesoverthejob.Ifthetworedundantdevicesareofequalper
4、formance,thereshouldbenodetrimentaleffectatallonpowersystemoperations,andanon-functioningdevicewouldjustneedtoberepairedorreplaced.Thetelecomsindustryappliesa“nosinglepointoffailure”criteriaforcommunicationsnetworks.Reliabilityiscommonlyachievedbyconfiguringthecomm
5、unicationslinksinrings.Aringprovidesanalternativecommunicationspathratherthanaduplicatedcommunicationscable,minimizingcapitalinvestmentcostsandstillsatisfyingreliabilityrequirements.Forrelaying,thepreferredmethodofmeetingreliabilityrequirementshasbeentousephysicall
6、yseparate,redundantprotectiondevices.Apilotprotectionschemeconsistsofrelays,communicationsinterfacedeviceandacommunicationschannel.Alloftheseneedtofunctionproperlyfortheprotectionschemetooperateasintended.Thereliabilityofapilotprotectionscheme,evenwithachannelindep
7、endentZone1,wouldbenefitasmuchfromredundantcommunicationchannelsasredundantrelaydevices.However,independentchannelsarenotalwayseconomicallyjustifiedduetothehighcostinvolvedforasecondcommunicationslink.Thispaperisexaminingredundancyrequirementsforrelayingandpresents
8、anewapproach.Thepapersuggeststhatasingledevicewithredundantmodulescanaccomplishashigh,orhigher,redundancyasthephysicallyseparateboxconcept.Thepap
