2023年简析电流互感器开路的危害原因现象及处理方法和防范措施

简析电流互感器开路旳危害、原因、现象及处理措施和防备措施（Analysisofcurrenttransformeropencircuithazards,causes,phenomena,treatmentmethodsandpreventivemeasures）简析电流互感器开路旳危害、原因、现象及处理措施和防备措施(Analysisofcurrenttransformeropencircuithazards,causes,phenomena,treatmentmethodsandpreventivemeasures)Analysisofcurrenttransformeropencircuithazards,causes,phenomena,treatmentmethodsandpreventivemeasuresAbstract:inrecentyears,withthecontinuousdevelopmentofpowergridandtheincreaseofelectricalequipment,theaccidentscausedbycurrenttransformershavealsoincreased,especiallytheaccidentscausedbytheopencircuitofcurrenttransformers.Thefaultandabnormaloperationofcurrenttransformerwillcausemaloperationorrefusalofprotection,soitisveryimportantforfieldoperatorstocorrectlyjudgethefaultsofcurrenttransformeranddealwithitintime.Inthispaper,theharm,causes,phenomena,treatmentmethodsandpreventivemeasuresofcurrentmutualinductanceopencircuitarebrieflyanalyzed.Keywords:currenttransformer;opencircuit;phenomenon;reason;treatmentmethod;preventivemeasuresInordertoensurethesafeandeconomicaloperationofpowersystem,theoperationofpowerequipmentmustbemonitoredandmeasured.Butdirectaccesstomeasurementandprotectiondeviceisnotgenerallyahighvoltageequipment,currenttransformeristheroleofthecurrentofthesystemintosmallcurrentscaling,supplymeasuringandprotectiondevice,andtwotimeswithhighvoltageisolationsystem.I.harmofopencircuitofcurrenttransformerTheprimarycurrentofthecurrenttransformerisindependentofthecurrentofthetwoload.Whenthetransformerisworkingnormally,becausetheimpedanceisverysmallandclosetotheshort-circuitstate,themagnetizationforceproducedbytheprimarycurrentiscompensatedbythetwocurrent,thetotalfluxdensityisnotbig,andthetwowindingpotentialisnotbig.Whenthecurrenttransformeropens,theimpedanceZ2increasesinfinitely,thetwowindingcurrentequalszero,andthemagnetizingforceofthetwowindingequalszero,andthetotalmagnetizationequalsthemagnetizingforceoftheprimarywinding(I0N0=I1N1).Itisacompletelyintothecurrentexcitationcurrent,electromotiveforceisveryhighinthetwowinding,thepeakofuptoseveralthousandvolts,theriskofpersonalsafety,orcauseinstrument,protectiondevice,transformerinsulationdamagetwo.Inaddition,themagneticforceoftheprimarywindingincreasesthemagneticfluxdensityoftheironcore,whichmaycausesevereoverheatingofthecore.Two、reasonsforopencircuitofcurrenttransformerTherearemanyreasonsfortheopencircuitofcurrenttransformer,andthefollowingarethemainpoints:1.ACcircuitcircuitintheexperimentalwiringterminal,becauseofthestructuralandqualitydefects,inoperation,screwandcopperscrewholecontactbad,causeopencircuit.Thecurrentloopconnectingsheet,sincetheconnectingpieceofwoodglueistoolong,rotatingterminalmetalsheetdoesnotpressonthemetalconnectingsheetsonthewrongpressureinthebakelitesleeve,resultinginopen.3.,repairworkmistakes,suchasforgettorelaytheinternalcontacts,ormistakenlyopenthecurrenttransformertwocircuit,orafterthecurrenttransformerbodytestdidnotconnectthetwolinetozero.4.,thetwolineterminalcontactpressureisnottight,thecircuitcurrentisverylarge,heating,burningoroverheatingcausedbyopencircuit.5.,twocircuitexcessiveterminaloxidation,loose.6.outdoorterminalboxandjunctionboxaredamp,terminalscrewsandgasketsaretoorusty,badcontactoropencircuit.Three,thephenomenonofthecurrenttransformeropencircuitWhenthetwocircuitofthecurrenttransformerisopen,thefollowingphenomenaareproducedfordifferentcircuits:1.bythenegativesequencecurrentandzerosequencecurrentstartrelayprotectionandautomaticdevicemovefrequently,butnotnecessarilytotrip(aswellasotherconditions,maybelockedup)protectionrelay(somewithtwocircuitlockingfunction).2.,theactiveandreactivepowermeterindicatorisnotnormal,thethree-phaseindicatoroftheammeterisinconsistent,themeterisnotnormal.3.monitoringsystemrelateddatadisplayabnormal.The4.currenttransformerhasa"hum"abnormalsound.5.,theopencircuitfaultpointsparks,dischargesound,smokeandcharredphenomenon,abnormalhighvoltageoccursatthefaultpoint.The6.currenttransformerhasaseriousfever,accompaniedbypeculiarsmell,discolorationandsmoke.7.maloperationorrefusalofrelayprotectionandautomaticdevice.8.instrument,ammeter,relayandsoonsmokeburnout.Four、currenttransformeropencircuitprocessingmethod1.,whenthecurrenttransformertwocircuitopen,firstofalltopreventthetwowindingopencircuit,andendangerequipmentandpersonalsafety.Afteropeningthetwocircuitofthe2.currenttransformer,itshouldfindouttheopencircuitpositionandtrytomaketheshortcircuitattheopencircuit.Ifthereisnoshort-circuittreatment,thepowerfailurecanbeappliedtothedispatcher.Intheprocessofshortcircuithandling,attentionmustbepaidtosafety,attentionshouldbepaidtothetwocircuitofopencircuitwithabnormalhighvoltage.Insulatedglovesshouldbeworn,andqualifiedinsulatingtoolsshouldbeused,understrictsupervision.3.,thecurrenttransformertwoopencircuit,shouldfirstdistinguishthefault,whichgroupisthecurrentcircuit,opencircuitphase,whethertheimpactontheprotection.Reportscheduling,disableprotectionthatmaymalfunction.4.minimizetheprimaryloadcurrent.Ifthecurrenttransformerisseriouslydamaged,theloadshallbeshiftedandthepowerfailureshallbecheckedanddealtwith.5.trytoshort-circuitthecurrenttransformertwotimesonthetestterminalnearby,thenchecktheopencircuitpoint.Shortconnectionshallbeusedwhenshortcircuitedandshallbecarriedoutasperdrawing.Shortcontactshallbemadeinthefirstcircuitoftheopencircuitwheretheproperpositionistaken.6.ifshortcontactfoundspark,shortconnectioniseffective.Thefaultpointisintheloopbelowtheshortcontactandcanbefurthersearched.Ifthereisnosparkintheeventofshortconnection,itmaybeshortcircuited.Thefaultpointmaybeintheloopbelowtheshortcontact,andtheshortcontactpointcanbeshiftedforwardtoreducetherange.7.withinthescopeofthefault,shouldbeabletocheckthevulnerableterminalsandcomponents,checkthecircuithastouchedpartsofwork.8.,tocheckoutthefault,canhandle(suchaswiringterminalsandotherexternalcomponentsloose,badcontact,etc.),canbeimmediatelyprocessed,andthenputintotheexitofprotection.Failuretohandlethefaults(suchasinternalfaultsoftherelay)orfailtofindoutthefaultsshallbereportedtothehigherauthoritiesforinspection,handling,orreverseoperationtotransfertheloadandcheckthepowerfailure.Five,preventivemeasures1.,goodqualityequipment,equipmentprocurement,acceptanceandotheraspectsstrictlyinaccordancewithrelevantregulations,toensurethattheequipmentingoodcondition,andmeetqualityrequirements.2.operatingpersonnelshouldstrengthenthedailyandspecialperiodoftheequipment(hightemperature,highload,badweatherandotherinspectionandsupervisionwork),throughlistening,watching,smellandothermethodstodetectabnormalcurrenttransformer,preventtheopentofindthecauseoftheaccidentisnottimely.3.dothemaintenanceworkinmaintenanceworkinstrictaccordancewiththerelevantrules,strengthentheinspectionworkofmaintenanceprocessandmaintenance,topreventtheopencircuitcurrenttransformerduetothemaintenanceandrepairworkinthep