JobrisktipsCONTENTSPAGE010203ProtectiontripcontrolWordPublicpart--Basichazardpointsandpreventivemeasures04050607Publicpart-Circuit-relatedhazardpointsandpreventivemeasuresPublicpart-Setting-relatedvalueriskpointsandpreventivemeasuresPublicpart-DangerouspointsrelatedtoCBdriveandpreventivemeasuresRelevantdangerpointsandpreventivemeasuresforthelineprotectionpartRelevantdangerouspointsandpreventivemeasuresofthetransformerprotectionpartDangerouspointsandpreventivemeasuresrelatedtobusdifferenceprotection,buscouplingprotectionprotection,lowcycleprotectionandoverloadprotectionPublicpart--Basichazardpointsandpreventivemeasures01Publicpart--Basichazardpointsandpreventivemeasures1.StrikeandhurtpeopleandmistakenlytouchthecabinetdoorofthepowerdistributionroomPreventivemeasures:Wearahatwhenenteringtheoutdoorworksiteandpowerdistributionroom2.Liveplug-insandelectrostaticinductiondamageintegratedchipsPreventivemeasures:Whenreplacingtheplug-in,firstdisconnectthepowerofthedevice,anddischargethehumanbodytopreventdamagetothechip.Publicpart--Basichazardpointsandpreventivemeasures3MisconnectionandmisconnectionduringsecondaryworkPreventivemeasures:Whendisconnectingthewiring,makearecordofthedisconnection,andcheckitafterthewiringisrestored.4.LasereyeinjuryPreventionmeasures:Itisstrictlyprohibitedtoputtheopticalfiberintotheeyesofyourselfandothers.Publicpart--Basichazardpointsandpreventivemeasures5.IncorrectuseofmetergearssuchasmultimetersPreventivemeasures:a)Beforework,carefullyrefertotheoperatinginstructions;b),Duringwork,correctlyselectthegearandrangeaccordingtotheworkneeds,confirmthatthemeterholeispluggedincorrectly,andprohibittheuseofover-range;c),Thetestwiringandgearpositioncanbemeasuredonlyafterbeingreviewedbypeople.6.TheorderofintelligentstationsafetymeasuresiswrongPreventivemeasures:Whentheprimaryequipmentisnotpoweredoff,theintelligentterminaltrippingandreclosingoutlethardpressureplateshouldbeexitedfirst,andthebusbarprotectioncorrespondingisolationknifeswitchforcedsoftpressureplateshouldbeputinbeforetheintelligentterminalmaintenancepressureplatecanbeputintooperation.Publicpart--Basichazardpointsandpreventivemeasures7.DisassembleandrestoretheopticalfiberbyerrorPreventivemeasures:A)Beforeoperation,verifywhetherthefiberidentificationisstandardized,clear,andconsistentwiththeon-siteoperation;b).Theremovedopticalfibersshouldberecorded,andtherestorationshouldbecarriedoutonebyoneunderthesupervisionofaspecialperson,andcarefullychecked.;c).Afterrecovery,therelevantfibersignalrecoveryshouldbechecked.Itisstrictlyforbiddentopointtheopticalfiberintheeyesofyourselfandothers.8.ThevibrationoftheinstalledprotectionscreencausesthephaseprotectiontotripbymistakePreventivemeasures:setupspecialpersonneltomonitorandcommand,andstoptheadjacentprotection.Publicpart-circuit-relatedhazardpointsandpreventivemeasures02Publicpart-circuit-relatedhazardpointsandpreventivemeasures1.TheCTsecondarycircuitisopenPreventivemeasures

:1)BeforedisconnectingtheCTcircuit,usetheclampgaugetoconfirmnocurrentbeforedisconnectingtheCTcircuitanddismantlingwiringrecords;2)ThedisconnectedCTcircuitshallberestoredintime,andshallbecheckedandconfirmedbymultiplepeople;3)WhensealingtheCT,theshortsealinglinehasreliablecontactandusetheclamptabletoconfirmnocurrentinthecircuitbeforedisconnectingtheCTcircuit.2.ShortcircuitPreventivemeasures:WorkonthePTsecondarycircuitshoulduseinsulatingtools,helmet,andwiregloves.EachdisconnectedACvoltagecircuitterminalwiringshouldbewrappedwithinsulatingtapetopreventshortcircuitwithadjacentterminals,andmakearecordofdisconnectionPublicpart-circuit-relatedhazardpointsandpreventivemeasures3.ThetestvoltageissentbacktotheprimaryequipmenttwicePreventivemeasures:Beforeapplyingthetestvoltagetothedevice,theACvoltagecircuitontheprotectivescreenshouldbedisconnected,andthetestvoltageshouldbeappliedtothedeviceside.4.PreventfiberdamagewhenthefiberloopisunpluggedPreventivemeasures:Aftertheopticalfiberispulledout,adustcapshouldbeputonintimetopreventthewhiteceramicpinoftheopticalfiberfromtouchinghardobjects,whichmaycausepollutionoftheopticalheadordamagetotheopticalfiber.5.PreventmiscurrenttooperationintervalbeforecommonCTcircuittest.Preventivemeasures:CheckwhethertheCTsecondarycircuitisconnectedtootherequipment,andshouldbereliablydisconnectedtopreventthecurrenttotheoperationinterval.Publicsettingvalueriskpointsandpreventivemeasures03Publicsettingvalueriskpointsandpreventivemeasures1.On-sitesettingvaluesettingandwrongsettingduringcommissioningworkPreventivemeasures:Theon-sitesettingvalueadjustmentworkshallbecarriedoutbytwopeople;2)Afterthesettingvalueisinput,restartthepowersupplyoftheunit,andthenprintthefixedvalueoftheunitandtheofficialsettingvalueissued;3)Afterchecking,thesettingvalueofthedeviceshallnotbemodifiedatwill.Oncemodified,theprintingandcheckproceduresshallbeperformedagain.2.ThesettingvalueofthenewprotectionsectiondevicedoesnotmovePreventivemeasures:Whenmodifyingthefixedvalue,ifthenewprotectionsectionisinvolved,thenewprotectionsectionshallbeverified.Publicsettingvalueriskpointsandpreventivemeasures3.Settingvalue

errorsettingPreventivemeasures:Whensettingthesettingvalue,ifitinvolvessettingvalue,suchascontrolword,tripmatrix,softpressureplate,internalsettingvalue,etc.,itsmeaningshouldbeclarified,andthemanualshouldbeconsultedtopreventwrongsetting.Publicpart-DangerouspointsrelatedtoCBdriveandpreventivemeasures04Publicpart-DangerouspointsrelatedtoCBdriveandpreventivemeasures1.Personalandmechanicalinjurywhendrivingthecircuitbreaker(CB)Preventivemeasures:1)Whentheactionlogicoftheprotectiondeviceischecked,theoutletplateniswithdrawntopreventtheswitchfrombeingoperatedbymistake.2)Contactsshouldbestrengthenedduringtransmission.Thepersoninchargeoftheteaminformsthemaintenancepersonneltoconfirmthatnooneisworkingontheswitchbeforethetransmissioncanbecarriedout,andaspecialpersonwillbeassignedtomonitorit.3)Placethe"Protectisdriving"signonthecircuitbreaker.2.ProtectioncheckerrortripoperationswitchPreventivemeasures:1)Checktheconsistencyoftheplatenandtheequipmentbeforethetransmission;2)Beforethetransmissionofdifferentprotectivedevices,thecorrespondingplatenshallbecheckedaccordingly.Publicpart-DangerouspointsrelatedtoCBdriveandpreventivemeasures3.Aftertheprotectiondeviceisinspected,thepotentialoftheoutletplatenisabnormalandtripsbymistakePreventivemeasures:Whentheworkisoverandtheplatenisrestored,payattentiontocheckingthecorrectnessoftheplatenpotentialtopreventfalsetripping.Inparticular,specialattentionshouldbepaidtothecalibrationofpublicequipmentsuchasself-transmission,busdifferential,lowcycle,andoverload.4.MicorrectlycontroloperationswitchinremotecontroltestPreventivemeasures:hitthe"remote/local"handleoftheoperationswitchtothelocalpositiontopreventfalsecontroloftheoperationswitch.Relevantdangerpointsandpreventivemeasuresforthelineprotectionpart05Relevantdangerpointsandpreventivemeasuresforthelineprotectionpart1.triptheoppositesideCBmistakenlyduringthelineprotectiontransmissiontestPreventivemeasures:changethesidelongitudinalprotectionchannelto"self-ringstate"(isolationchannel)topreventoppositesideswitch;Iflongitudinalprotectionisrequired(withoutCB),oppositelongitudinalprotectiontrip,closingandopeningfailureshallbeclearlyisolatedtopreventmistransmissiontripoppositesideswitchorabnormaloppositesideoperationprotection.2.LightdifferentialprotectiondebuggingmistakenlytriptheoppositesideswitchPreventivemeasures:duringthelinelightdifferentialprotectioninspection,thesideprotectiondeviceshouldbeself-loopsoastoavoidaccidentallytrippingtheoppositeswitch.Relevantdangerpointsandpreventivemeasuresforthelineprotectionpart3.LineprotectioncheckfalsestartbusdifferentialprotectionfailurePreventivemeasures:Disconnecttheopenbusdifferentialfailureplaten.4.PersonalandmechanicalinjurycausedduringthedrivingtheCBPreventivemeasures:Duringdriving,thepersoninchargeoftheteaminformsthemaintenancepersonnelandconfirmsthatnooneisworkingontheswitchbeforethetransmissioncanbecarriedout.Andsetupaspecialpersontomonitor,andplacea"protectionistransmitting"signontheobviouspartoftheswitch.

5.ProtectioncheckerrortripoperationCBPreventivemeasures:intheprimaryequipmentoperationandpartialprotectionstopoperation,attentionshouldbepaidtobreakingtheplatetrippingcircuit,closedcircuitandothercircuitsrelatedtotheoperatingequipment.Theunrestrictedtripcircuit(includingthefartripcircuit),theclosingcircuitandtheconnectionrelatedtotheoperatingequipmentshallbeincludedintherelayprotectionmeasureticket.Relevantdangerpointsandpreventivemeasuresforthelineprotectionpart6.Duringsomepowercuts,theisolationmeasurestakenbytheprotectivepersonnelarenottakenPreventivemeasures:1.Beforework,checkwhetherthemeasureslistedintheworkticketarecorrectandcomplete,andwhethertheyarereallydonewell.2.Implementallmeasuresinstrictaccordancewiththeguidancecard,andtheexecutorandguardianshallearnestlyperformtheirduties.3.Forsomepowerfailureofconventionalstations,circuitssuchastripping,ACsampling,openingfailureandlongtripshouldbeisolated.7.Mis-trippedoperationequipmentduringdriving

CBPreventivemeasures:1.Checktheconsistencyoftheplatenandtheequipmentbeforethetransmission.2.Beforework,exitthefartrip,openingfailure,decompressionlockandfailurejointtripofthelineprotection.Relevantdangerouspointsandpreventivemeasuresofthetransformerprotection06Relevantdangerouspointsandpreventivemeasuresofthemaintransformerprotectionpart1.Mis-trippedthebuslinkCBPreventivemeasures:Whenthemaintransformerischecked,thepowerfailuremodeshouldbeclarifiedtopreventthebustieswitchfromtrippingbymistake,andisolationmeasuresshouldbetakeninthebustieterminalboxtopreventthecurrentfromflowingintotherunningmaintransformer.2.Whenthemaintransformerispre-testedandoverhauled,preventtheaccidentaltrippingofthegrid-connectedlinePreventivemeasures:Checkthatthegapprotectionremotetripgridconnectionpressureplatehasbeenremoved.3.Duringthemaintenanceandtestwork,themaintransformerprotectiontransmissionislikelytocausemis-trippedofthebuslinkCBonthelowandmediumvoltageside.Preventivemeasures:Whenthemaintransformerprotectionoverhaultestdrive,checkthattheoutletplatenofthebuslinkCBonthelow-voltagesideofthemaintransformerisdisconnected.Relevantdangerouspointsandpreventivemeasuresofthemaintransformerprotectionpart4.Mis-trippedthebuslinkswitchPreventivemeasures:whenthemaintransformerverification,clarifythepowerfailuremodetopreventaccidentaltrippingofthemotherjointswitch,andtakeisolationmeasuresintheparentterminalboxtopreventtheflexiblecurrenttothemainoperation.5.Duringthepre-testandmaintenanceofthemaintransformer,preventtheaccidentaltripofthenetworkconnectionlinePreventivemeasures:checktheclearanceprotectionfartripandmeshpressureplatehasbeenremoved.6.Duringthemaintransformerprotectiondrive,theLVandLVsidebusswitchPreventivemeasures:whenthemaintransformerprotectionmaintenancetestdrive,checkthedisconnectionofthebusswitchoutletplatenontheLVsideofthemaintransformertrip.Dangerouspointsandpreventivemeasuresrelatedtobusdifferenceprotection,buscouplingprotectionprotection,lowcycleprotectionandoverloadprotection07Hazardpointsandpreventivemeasuresrelatedtomaternaldifference,maternalunion,lowweekandoverloadpart1.Thenewprotectionisconnectedtothebusdifferentialdrive,andtheoperationCBistrippedbymistake.PreventivemeasuresExitalloutletplaten,cutoffthecontrolpowerbeforetransmission,andcheckwhethertheplatenare