FORMDTR(IEC)2009-01-09®RegisteredtrademarkoftheInternationalElectrotechnicalCommission3/1029/DTRDRAFTTECHNICALREPORTProjectnumberIEC/TR62711/Ed.1IEC/TCorSC3SecretariatSwedenDistributedon2010-11-26Votingterminateson2011-01-28AlsoofinteresttothefollowingcommitteesTC57,TC65,SC65B,TC95SupersedesdocumentFunctionsconcernedSafetyEMCEnvironmentQualityassuranceTHISDOCUMENTISSTILLUNDERSTUDYANDSUBJECTTOCHANGE.ITSHOULDNOTBEUSEDFORREFERENCEPURPOSES.RECIPIENTSOFTHISDOCUMENTAREINVITEDTOSUBMIT,WITHTHEIRCOMMENTS,NOTIFICATIONOFANYRELEVANTPATENTRIGHTSOFWHICHTHEYAREAWAREANDTOPROVIDESUPPORTINGDOCUMENTATION.TitleIEC/TR62711:Mnemonicsanddesignationsofsymbolsformeasuringrelays,instrumentsandrelateddeviceTC3PT42haspreparedadraftTechnicalreportincludingrecommendationsforuseofmnemonicsinsymbolsrelatedtomeasuringrelays,instrumentsandsimilardevices.Itwasdecidedintheplenarymeeting2008inPraguethattheworkofPT42willresultinaTR.Thedraftwaspreliminarycirculatedindocument3/1023/DCtotheNCsbeforetheplenarymeeting2010inSeattle.IntheplenarymeetinginSeattleitwasdecidedtocirculatethedocumentasDTStotheNCsforcommentaryandvoting.Copyright©2010InternationalElectrotechnicalCommission,IEC.Allrightsreserved.Itispermittedtodownloadthiselectronicfile,tomakeacopyandtoprintoutthecontentforthesolepurposeofpreparingNationalCommitteepositions.Youmaynotcopyor"mirror"thefileorprintedversionofthedocument,oranypartofit,foranyotherpurposewithoutpermissioninwritingfromIEC.®62711/Ed.1TRÓIEC:2010–2–3/1029/DTRCONTENTS1Scope......................................................................................................................52References..............................................................................................................53Definitions...............................................................................................................63.1Protectionrelay................................................................................................64Measuringrelaysymbols........
