±660kV直流架空输电线路带电作业技术导则-英文版

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29.240.01

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F24

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RecordNo. 44815-2014 

DL

ElectricPowerIndustryStandardofthePeople’sRepublicofChina

DL/T1341—

FORMTEXT

2014

TechnicalGuideforLiveWorkingon±660kVDCTransmissionLine

IssueDate:March18,2014

ImplementationDate:August1,2014

IssuedbyNationalEnergyAdministrationofthePeople’sRepublicofChina

Foreword

ThisstandardwascompiledinaccordancewiththetaskarrangedbyNoticeoftheNationalEnergyAdministrationonIssuingtheFirstBatchofIndustryStandardFormulation(Revision)PlansintheEnergySectorin2010(No.320oftheDepartmentofScienceandTechnologyoftheNationalEnergyAdministration).

ThisstandardwasproposedbytheChinaElectricityCouncil.

ThisstandardwaspreparedbytheNationalTechnicalCommitteeofStandardizationforLiveWorking.

Maindraftingorganizationsofthisstandard:ChinaElectricPowerResearchInstitute,StateGridShandongElectricPowerCompany,andStateGridShanxiElectricPowerCompany.

Maindraftersofthisstandard:LIUKai,HUYi,XIAOBin,LIUHongzheng,LIUTing,MENGHailei,YONGJun,NIUBiao,DONGYanwu,LIUYan,PENGYong,andSUZiming.

Duringtheprocessofimplementingthisstandard,relevantopinionsoradvicecanbefedbacktotheStandardizationManagementCenteroftheChinaElectricityCouncil(No.1,Lane2,BaiguangRoad,Beijing,100761).

TechnicalGuideforLiveWorkingon±660kVDCTransmissionLine

Scope

Thisstandardspecifiesthetechnicalrequirementsandmattersneedingattentionforliveworkingon±660kVDCtransmissionlines,aswellasthetest,transportationandstorageoftheworkingtools.

Thisstandardisapplicabletoliveworkingon±660kVDCtransmissionlinesinareaswithanaltitudeof2000mandbelow.

Normativereferences

Thefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

GB/T2900.55ElectrotechnicalTerminology—LiveWorking(eqvIEC60050—651)

GB/T6568ScreenClothesforLiveWorking(GB/T6568—2008，IEC60895:2002，MOD)

GB/T13035LiveWorking—InsulatingRopes

GB13398InsulatingHollowTubesandFoam-FilledTubesandSolidRodsforLiveWorking

GB/T14286LiveWorking—TerminologyforTools,EquipmentandDevices(GB/T14286—2008,IEC60743:2001,MOD)

GB/T18037TechnicalRequirementsandDesignGuideforLiveWorkingTools

GB26859SafetyCodeofElectricPowerIndustry—PartofElectricLines

DL/T463InsulatorHolderforLiveWorking

DL/T876GuideofInsulationCoordinationforLiveWorking

DL/T878TestGuideoftheInsulatingToolforLiveWorking

DL/T966TechnicalGuideforLiveWorkinginTransmissionLine

DL/T974DepotofToolsforLive-Working

DL/T976PreventiveTestCodeofTools,DevicesandEquipmentforLiveWorking

Termsanddefinitions

Forthepurposesofthisstandard,thetermsanddefinitionsgiveninGB/T2900.55andGB/T14286aswellasthefollowingapply.

3.1liveworkingonDCtransmissionline

live-linerepair,maintenance,andreplacementofpartscarriedoutonDCtransmissionlines

3.2potentialrod

metaltoolusedbyanequipotentialworkerwhenenteringorleavingequipotential,inordertoreducetheimpactofdischargearconthehumanbodyandavoidpossibledamagetoconductiveclothingcausedbypulsedcurrent

3.3electricfieldshieldmask

maskmadeofconductivematerials,usedforelectricfieldprotectionoftheworker'sface,andconnectedwithotherscreentoolsforintegraluse

Generalrequirements

4.1Personnelrequirements

4.1.1Liveworkingworkersshallbeingoodhealthandfreefromphysicalandpsychologicalobstaclesthathinderwork.Theyshallhaveabasicknowledgeofelectricalprinciplesandpowerlines,masterthebasicprinciplesandoperatingmethodsofliveworking,andbefamiliarwiththescopeofapplicationandusingmethodsoftheworkingtools.TheyshallbefamiliarwithGB26859,DL/T966andthisstandard.Theyshallmasteremergencyrescuemethods,especiallytheelectricshockrescue.Theyshallreceivetheoreticalandoperationaltrainingfromspecializedtraininginstitutions,passrelevantexaminationsandholdrelevantcertificates.

4.1.2Thepersoninchargeofthework(orthesafetyguardian)shallhaveatleast3yearsofactualworkingexperienceinliveworkingonpowertransmissionlines,befamiliarwithequipmentconditions,havecertainorganizationalcapabilityandaccidenthandlingability,andpasstheexaminationafterspecialtraining.

4.2Institutionalrequirements

AccordingtoGB26859andthisstandard.

4.3Meteorologicalrequirements

4.3.1Liveworkingshallbecarriedoutingoodweather.Incaseofthunder,rain,snowandfog,liveworkingshallnotbecarriedout.Whenthewindforceisgreaterthanlevel5(10m/s),liveworkingshouldnotbecarriedout.

4.3.2Ifliveworkingisrequiredinweatherwithrelativehumiditygreaterthan80%,insulatingtoolswithmoisture-proofperformanceshallbeadopted,andthepossibilityofinsulationdegradationoftheinsulatingtoolsunderhighhumidityshallbeconsidered.

4.3.3Underspecialoremergentconditions,whenemergentlive-linerepairmustbecarriedoutinharshclimate,relevantengineeringandtechnicalpersonnelandallworkingpersonnelshallbeorganizedtofullydiscussandformulatereliablesafetymeasuresaccordingtothesiteclimateandworkingconditions,andtheemergentlive-linerepaircanbecarriedoutonlyaftertheapprovalofthechiefengineeroftheunitortheleaderinchargeofproductionoftheunit.Sufficientlightingfacilitiesshallbeprovidedfornightwork.

4.3.4Incaseofasuddenchangeofweatherduringliveworking,whichcanendangerpersonalorequipmentsafety,theworkshallbestoppedimmediately.Undertheconditionofensuringpersonalsafety,thenormalworkingconditionsoftheequipmentshallberestoredassoonaspossibleorotherprotectivemeasuresshallbetaken.

4.4Otherrequirements

4.4.1Fornewliveworkingprojectsthataremorecomplicatedandmoredifficultandnewdevelopedtools,scientifictestsshallbeconductedtoconfirmsafetyandreliability,andsafetymeasuresandoperationprocessplansshallbeestablished,andthetoolscanbeoperatedonequipmentonlyaftertheapprovalofthechiefengineeroftheunitortheleaderinchargeofproductionoftheunit.

4.4.2Thepersoninchargeofliveworkingshallcontactthedispatcherbeforetheworkstarts,andtheworkcanbestartedonlyaftercontacting.WhenitisnecessarytodisableDCrestartprotectiondevices,thelicenseformalitiesshallbeperformed.Aftertheworkisfinished,reportingtothedispatchershallbedoneintime.Itisstrictlyprohibitedtostoporresumetherestartprotectiondevicesatanappointedtime.

Technicalrequirements

5.1Groundpotentialworking

5.1.1Whentheworkerworksatgroundpotential,theminimumworkingdistancebetweentheworkeratgroundpotentialonthetowerandtheliveconductorsshallmeettheprovisionsofTable1.

Table1Minimumworkingdistanceofgroundpotentialworking

Altitude/m

Minimumworkingdistance/m

≤500

4.2

500～1000

4.5

1000～1500

4.7

1500～2000

5.0

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.1.2Theminimumeffectiveinsulationlengthofinsulatingtools,devicesandequipmentshallmeettheprovisionsofTable2.

Table2Minimumeffectiveinsulationlengthofinsulatingtools,devicesandequipment

Altitude/m

Minimumworkingdistance/m

≤500

5.0

500～1000

5.3

1000～1500

5.6

1500～2000

5.9

5.2Barehandworking

5.2.1Duringbarehandworking,theminimumworkingdistancebetweentheequipotentialworkerandtheearthingconductorsshallmeettheprovisionsofTable3.

Table3Minimumworkingdistanceofbarehandworking

Altitude/m

Minimumworkingdistance/m

Distancebetweentheequipotentialworkerandthesidetowerframe

Distancebetweentheequipotentialworkerandthetopcrossarmorthetopframe

≤500

4.2

4.8

500～1000

4.5

5.1

1000～1500

4.7

5.3

1500～2000

5.0

5.6

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.2.2Whentheworkerentersorleavesequipotentialviainsulatingtoolsoralonginsulatorstrings,theminimumcombinedgapshallmeettheprovisionsofTable4.

Table4Minimumcombinedgap

Altitude/m

Minimumcombinedgap/m

≤500

4.3

500～1000

4.6

1000～1500

4.8

1500～2000

5.1

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.2.3Whentheequipotentialworkerentersorleavesequipotentialalongtensioninsulatorstrings,thenumberofinsulatorsshort-circuitedbythehumanbodyshouldnotbemorethan4.TheminimumnumberofgoodinsulatorsshallmeettheprovisionsofTable5afterthenumberofinsulatorsshort-circuitedbythehumanbodyandbadinsulatorsisdeductedfromthetensioninsulatorstrings.

Table5Minimumcombinedgapandtheminimumnumberofgoodinsulators

Altitude/m

Minimumtotallengthofthegoodinsulatorstring/m

Structureheightofeachinsulator/mm

Theminimumnumberofgoodinsulators

≤500

4.4

170

26

195

23

205

22

240

19

500～1000

4.7

170

28

195

25

205

23

240

20

1000～1500

5.0

170

30

195

26

205

25

240

21

1500～2000

5.3

170

32

195

28

205

26

240

23

5.3Safetyprotection

5.3.1TheequipotentialworkershallwearTypeIIconductiveclothingandflameresistantunderwearaccordingtoGB/T6568.

5.3.2Theworkeratgroundpotentialonthetowershallwearafullsetofelectrostaticprotectiveclothingorconductiveclothing.

5.3.3Theinsulatedoverheadgroundwireshallberegardedasaliveconductor,andtheworkersshallkeepadistanceof0.6mfromit.Ifitisnecessarytoworkontheoverheadgroundwire,itshallbegroundedwellthroughadedicatedearthingcable.Themethodsandstepsforhangingordismantlingthededicatedearthingcableontheoverheadgroundwirearethesameasthoseforhangingordismantlingtheearthingcableonapower-offline.Afterhangingupthededicatedearthingcableandwearingafullsetofelectrostaticprotectiveclothingorconductiveclothing,theworkersmaycarryoutmaintenance.

5.3.4Foranopticalfibercompositeoverheadgroundwire(OPGW)groundedbyeachtowerfoundationorotherdirectlygroundedoverheadgroundwires,theworkersmaydirectlycarryoutmaintenanceworkbywearingafullsetofelectrostaticprotectiveclothingorconductiveclothing.Ifitisnecessarytodisconnectthedirectlygroundedoverheadgroundwiresfromtheground,theoverheadgroundwiresshallbehungwithearthingcablesbeforemaintenance.

5.3.5Beforeoverhaulinginthemiddleoftheoverheadgroundwirespan,inordertoensurehis/hersafety,theworkershallcheckwhethertheverticaldistancebetweenhim/herandtheliveconductorsbelowmeetstheminimumworkingdistancerequirementsaftertheoverheadgroundwireintheworklocationisloadedbyhim/her,andwhetherthemechanicalstrengthoftheoverheadgroundwiremeetsrelevantrequirements.

5.3.6Whenworkingontheuni-polarpower-offside(theotherpoleisrunning),theworkershallwearafullsetofelectrostaticprotectiveclothingorconductiveclothing.

5.3.7Whenusinginsulatingropestotransferlargemetalobjects,theworkeratgroundpotentialoronthetowershallgroundthemetalobjectsbeforetouchingthem.

5.3.8Withregardtolargemetalobjects(e.g.automobiles,etc.)insulatedfromthegroundandplacednearstrongelectricfields,attentionshallbepaidtoprotectingpeoplefrominducedelectricalinjury.Themetalobjectsmustbegroundedbeforetheycanbetouched.

5.4Potentialtransfer

5.4.1Theequipotentialworkershallobtainpermissionfromthepersoninchargeoftheworkbeforepotentialtransferandshallnotlosetheprotectionofthesafetybelt.

5.4.2ForpotentialtransferofDCtransmissionlines,thepotentialrodshouldbeused,whichshallbeinreliablecontactwithliveconductors.Beforeenteringequipotential,theworkershallcontactthepotentialrodquicklywiththeliveconductorsatadistanceofabout0.4mfromthem.Whenleavingequipotential,theworkershallcontactthepotentialrodwiththeliveconductorsfirst,andthenwithdrawthepotentialrodquicklyafterleavingtheliveconductors0.4maway.

5.4.3Duringpotentialtransfer,theactionshallbesmooth,accurateandfast.

Enterorleaveequipotential

6.1Enterorleaveequipotentialonasuspensiontower

6.1.1Whenenteringorleavingequipotentialonasuspensiontower,theworkershallnotenterorleaveequipotentialverticallyfromthecrossarmsoralongtheinsulatorstrings.Thehangingbasket(hangingchairandhangingladder)method,theinsulatingflexibleladdermethodandothermethodsmaybeusedtoenterandleaveequipotential.

6.1.2Whentheworkerentersorleavesequipotential,alltheelectricalgapdistances(includingtheworkingdistancesandthecombinedgaps)betweentheworkerandtheearthingconductorsandtheliveconductorsshallmeettherequirementsofTables3andTable4.

6.1.3Thehangingbaskets(hangingchairsandhangingladders)shallbestablysuspendedbyinsulatingslings,andthemovingspeedshallbestrictlycontrolledbyinsulatingpulleysetstoachieveauniformandslowspeed.Thelengthoftheinsulatingslingsforfixingshallbeaccuratelycalculatedoractuallymeasuredtoensurethatthehighestpartofthehumanbodyshallnotexceedtheupperedgeofthegradingringontheconductorsidewhentheworkerentersorleavesequipotential.

6.2Enterorleaveequipotentialonatensiontower

6.2.1Whenenteringorleavingequipotentialonatensiontower,theworkermayenterorleaveequipotentialalonghorizontaltensioninsulatorstringsorviaothermethods.

6.2.2Whentheworkermovesalongthehorizontaltensioninsulatorstrings,thepositionsofhis/herhandsandfeetmustbekeptconsistent,andthenumberofgoodinsulatorsshort-circuitedbythehumanbodyandtoolsshallmeettherequirementsofTable5.

6.2.3Theworker’ssafetyprotectionropeshallbetiedtotheinsulatorstringheldbyhis/herhandsandshallmovesynchronouslywithhim/her.

6.2.4Whenenteringorleavingequipotential,theworkershalltransferpotentialwhenmovingtoadistanceofabout0.4m(2~3insulators)fromtheliveconductorsbeforecarryingoutsubsequentoperations.

6.2.5Alltheelectricalgapdistances(includingtheworkingdistancesandthecombinedgaps)betweentheworkerandtheearthingconductorsandtheliveconductors,andthenumberofgoodinsulatorsshort-circuitedbythehumanbodyortoolsshallmeettherequirementsofTable5.

Mattersneedingattentionatwork

7.1Theworkersshallavoidexcessivebodymovementsduringliveworking.

7.2Insulatingtoolsshallbeusedtotransferarticlesbetweentheequipotentialworkerandthegroundpotentialworker.TheeffectivelengthoftheinsulatingtoolsshallmeettherequirementsofTable2.

7.3Theconductiveclothingshallbefreefromdamageandholes,andallpartsofitshallbeconnectedwellandreliably.Whendamageandburrsarefound,itshallberepairedintime,anditcanbeusedonlyafterpassingthetest.

7.4Beforetheinsulatingtoolsareused,aninsulationresistancetestershallbeusedtoconductsegmentedinsulationtests.Thewidthofthemeasuringelectrodesis2cm,anditisrequiredthattheinsulationresistancebetweenevery2cmofmeasuringelectrodesshallnotbelessthan700MΩ.

7.5Theinsulatingtoolsshallbeprotectedfrommoistureandsurfacedamageanddirtwhenused.Theinsulatingtoolstobeusedshallbeplacedonclean,dryandmoisture-proofpads.Whenfounddampenedorsurface-damagedorsurface-dirty,theyshallbehandledintimeandcanbeusedonlyafterpassingthetest.

7.6Duringthework,bearingtoolsshallbefixedandreliableandhavebackupprotection.

7.7Ifdeterioratedorlowresistanceinsulatorsarefoundduringlivetestingofinsulators,theyshallberetested2-3timestoavoidmisjudgment.

7.8Whenthefirstinsulatornearthecrossarmisdismantledorinstalled,itmustbeshort-circuitedbeforeoperation.

Testoftools,devicesandequipment

8.1Thedesignofliveworkingtools,devicesandequipmentshallconformtotherequirementsofGB/T18037.Conductiveclothing,insulatingropes,insulatingrods,insulatorholders,etc.,shallpasstypetestsandleavingfactorytestsinaccordancewiththerequirementsofGB/T6568,GB/T13035,GB13398,DL/T463,DL/T878.

8.2Thetools,devicesandequipmentshallbesubjectedtoelectricaltestsandmechanicaltestsonaregularbasisaccordingtothetestmethodsofDL/T976.Thetestcyclesareasfollows:

a)electricaltests.Preventivetestsshallbeconductedonceayear,andinspectiontestsshallbeconductedonceayear,andtheintervalbetweentwotestsshallbehalfayear.

b)mechanicaltests.Preventivetestsshallbeconductedonceeverytwoyearsforinsulatingtoolsandonceeveryyearformetaltools.

8.3Preventivetests

8.3.1DCwithstandvoltagetest:theinsulationlengthofthetestsamplebetweenthetestelectrodesshallbe4.8m;thewithstandvoltageshallbe755kV;thetimeshallbe3min.Itisqualifiedifnobreakdown,flashoveroroverheatingoccur.

8.3.2Switchingimpulsewithstandvoltagetest:theinsulationlengthofthetestsamplebetweenthetestelectrodesshallbe4.8m;thestandardswitchingimpulsewave(+250μs/2500μs)shallbeapplied;thevoltageamplitudeshallbe1325kV;thetestsampleshallwithstand15times.Itisqualifiedifnobreakdownorflashoveroccur.

8.3.3Staticloadtest:aloadof1.2timestheweightoftheratedworkingloadshallbeappliedfor1min.Itisqualifiedifnodeformationordamageoccur.

8.3.4Dynamicloadtest:3timesofactualoperationsshallbedonewithaloadof1.0timestheweightoftheratedworkingloadapplied.Itisqualifiedifthetoolsareflexible,portableandfreefromjamming.

8.4Inspectiontests

8.4.1Theinsulatingtoolshallbedividedintoseveralsectionsforpowerfrequencywithstandvoltagetests.Avoltageof75kVshallbeappliedacrossper300mmoftheinsulatingtoolfor1min.Itisqualifiedifnobreakdown,flashoverorheatingoccur.

8.4.2Thewholesetofconductiveclothingshallbefreeofdamage,holesandburrsintheappearanceinspection,andtheconnectingdevicesofallpartsshallbereliableandintact,withgoodconductionafterconnection.

Transportationandstorageoftools,devicesandequipment

9.1Duringtransportation,theinsulatingtools,devicesandequipmentshallbeputintodedicatedtoolbags,toolboxesortoolvehiclestopreventmoistureanddamage.

9.2Holdersandclampswithlowsurfacehardnessandmetaltools(suchasscrewrods)thatshouldnotbebumpedshallbetrans