500kV交流紧凑型输电线路带电作业技术导则-英文版

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ElectricPowerIndustryStandardofthePeople’sRepublicofChina

DL/T400—2019

ReplaceDL/T400—2010

TechnicalGuideforLiveWorkingin500kVACCompactTransmissionLine

IssueDate:June4,2019

ImplementationDate:October1,2019

IssuedbyNationalEnergyAdministrationofthePeople’sRepublicofChina

Foreword

ThisstandardwasdraftedinaccordancewiththerulesgiveninGB/T1.1—2009Directivesforstandardization—Part1:Structureanddraftingofstandards.

ThisstandardisarevisionofDL/T400—2010TechnicalGuideforLiveWorkingin500kVACCompactTransmissionLine.ComparedwithDL/T400—2010,themainchangesareasfollows:

—thescopeofapplicationhasbeenexpandedtosingle-circuitanddouble-circuit500kVACcompactlinesatanaltitudeof3000mandbelow;

—thetechnicalrequirementsforworkingononepower-offcircuitwhiletheothercircuitislivehavebeenadded.

ThisstandardwasproposedbytheChinaElectricityCouncil.

ThisstandardwaspreparedbytheNationalTechnicalCommitteeofStandardizationforLiveWorking(SAC/TC36).

Maindraftingorganizationsofthisstandard:ChinaElectricPowerResearchInstituteCo.,Ltd,JinhuaPowerSupplyCompanyofStateGridZhejiangElectricPowerCo.,Ltd,StateGridShandongElectricPowerCompany,StateGridJiangsuElectricPowerCo.,Ltd,andStateGridHubeiElectricPowerCo.,Ltd.

Maindraftersofthisstandard:LEIXinglie,FANGYuqun,LIUTing,LIUKai,SUNXiaobin,HANXuechun,SUNXiaofeng,HUANGZhenning,MAJianguo,HUChuan,PENGYong,WANGBin,andQIANLiqun.

ThisstandardreplacesDL/T400—2010afterimplementation.

ThisstandardwasissuedonJanuary9,2011asfirstedition,andthisisthefirstrevisededition.

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

TechnicalGuideforLiveWorkingin500kVACCompactTransmissionLine

Scope

Thisstandardspecifiesthetechnicalrequirements,enteringorleavingequipotential,andthetest,transportationandstorageoftoolsforliveworkingon500kVACcompacttransmissionlines.

Thisstandardisapplicabletoliveworkingon500kVsingle-circuitanddouble-circuitACcompacttransmissionlinesatanaltitudeof3000mandbelow.

Normativereferences

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

GB/T2900.55ElectrotechnicalTerminology—LiveWorking

GB/T6568ScreenClothesforLiveWorking

GB/T13035LiveWorking—InsulatingRopes

GB13398InsulatingHollowTubesandFoam-FilledTubesandSolidRodsforLiveWorking

GB/T14286LiveWorking—TerminologyforTools,EquipmentandDevices

GB/T18037TechnicalRequirementsandDesignGuideforLiveWorkingTools

GB26859SafetyCodeofElectricPowerIndustry—PartofElectricLines

DL/T409SafetyCodeofElectricPowerIndustry(PartofElectricLines)

DL/T463InsulatorHolderforLiveWorking

DL/T876GuideofInsulationCoordinationforLiveWorking

DL/T878TestGuideoftheInsulatingToolforLiveWorking

DL/T974DepotofToolsforLive-Working

DL/T976PreventiveTestCodeofTools,DevicesandEquipmentforLiveWorking

Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninGB/T2900.55andGB/T14286aswellasthefollowingapply.

3.1liveworkingwithprotectivegap

liveworkingcarriedoutafterinstallingprotectivegapsintheadjacenttowersoftheworklocationtolimitovervoltageintheworklocation

Generalrequirements

4.1Personnelrequirements

4.1.1Liveworkingworkersshallbeingoodhealthandfreefromphysicalandpsychologicalobstaclesthathinderwork.

4.1.2Theliveworkingworkersshallhaveabasicknowledgeofelectricalprinciples,masterthebasicprinciplesandoperatingmethodsofliveworking,andbefamiliarwiththeapplicationscopeandusingmethodsofworkingtools.Theyshallmasteremergencyrescuemethods,especiallytheelectricshockrescue.

4.1.3Theliveworkingworkersshallreceivededicatedtraining,passrelevantexaminationsandholdrelevantcertificates.

4.1.4Thepersoninchargeofthework(ortheguardian)shallhaveatleast3yearsofactualworkingexperienceinliveworkingonpowertransmissionlineswithavoltageclassof500kVandabove,befamiliarwithequipmentconditions,andhavecertainorganizationalcapabilityandaccidenthandlingability.

4.2Institutionalrequirements

AccordingtotheprovisionsofandtherelevantinstitutionsofGB26859andDL409.

4.3Meteorologicalrequirements

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

4.3.2Ifliveworkingisrequiredinweatherwithrelativehumiditygreaterthan80%,insulatingtoolswithmoisture-proofperformanceshallbeadopted.

4.3.3Underspecialoremergentconditions,ifemergentlive-linerepairmustbecarriedout,thepersoninchargeoftheworkshallorganizerelevantpersonneltofullydiscussandformulatereliableorganizationalmeasures,safetymeasuresandtechnicalmeasuresaccordingtothesiteclimateandtheworkingconditions,andtheemergentlive-linerepaircanbecarriedoutonlyafterapproval.

4.3.4Incaseofasuddenchangeofweatherduringliveworking,whichmayendangerpersonalorequipmentsafety,theworkshallbestoppedimmediately.Undertheconditionofensuringpersonalsafety,thenormalworkingconditionsoftheequipmentshallberestoredassoonaspossibleorothermeasuresshallbetaken.

4.4Otherrequirements

4.4.1Fornewliveworkingprojectsthataremorecomplicatedandmoredifficultandnewdevelopedtools,scientifictestsshallbeconductedtoconfirmsafetyandreliability,andsafetymeasuresandoperationprocessplansshallbeestablished.Theprojectsandtoolscanbeusedonlyafterapproval.

4.4.2Thepersoninchargeofliveworkingshallcontactthedutydispatcherbeforetheworkstarts,andtheworkcanbestartedonlyaftercontacting.Whenitisnecessarytodisableautomaticreclosingdevices,thelicenseformalitiesshallbeperformed.Aftertheworkisfinished,reportingtothedutydispatchershallbedoneintime.Itisstrictlyprohibitedtostoporresumethereclosingdevicesatanappointedtime.

Technicalrequirements

5.1Maximumovervoltagetimes

Theminimumworkingdistance,theminimumcombinedgapandtheminimumeffectivelengthofinsulatingtoolsforliveworkingon500kVACcompactlinesshallbedeterminedaccordingtothemaximumovervoltagetimesatwork.Themaximumovervoltagetimescanbecalculatedaccordingtothesystemparameters.Iftheexactovervoltagetimesisnotknown,appropriateworkgapsshallbeselectedaccordingtothepossiblemaximumovervoltagetimesofthe500kVsystem[2.18(perunitvalue)].

5.2Groundpotentialworking

5.2.1Whentheworkerworksatgroundpotential,theminimumworkingdistancebetweenthegroundpotentialworkeronthetowerandtheliveconductorsshallnotbelessthantheprovisionsinTable1.

Table1Minimumworkingdistancebetweenthegroundpotentialworkeronthetowerandtheliveconductors(unit:m)

AltitudeH/m

Phase-to-groundmaximumswitchingovervoltagetimes(perunitvalue)

1.80andbelow

Above1.80

H≤1000

3.0

3.2

1000<H≤2000

3.2

3.4

2000<H≤3000

3.4

3.6

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.2.2TheminimumeffectiveinsulationlengthofinsulatingtoolsshallmeettheprovisionsinTable2.

Table2Minimumeffectiveinsulationlengthofinsulatingtools(unit:m)

AltitudeH/m

Insulatinghandsticks

Insulatingload-bearingtoolsandinsulatingropes

Phase-to-groundmaximumswitchingovervoltagetimes(perunitvalue)

1.80andbelow

Above1.80

1.80andbelow

Above1.80

H≤1000

3.5

3.7

3.2

3.4

1000<H≤2000

3.7

3.9

3.4

3.6

2000<H≤3000

3.9

4.1

3.6

3.8

5.3Barehandworking

5.3.1Whentheworkerentersorleavesequipotentialviainsulatingtools,theminimumcombinedgapshallnotbelessthantheprovisionsinTable3.

Table3Minimumcombinedgapofenteringorleavingequipotential(unit:m)

AltitudeH/m

Phase-to-groundmaximumswitchingovervoltagetimes(perunitvalue)

1.80andbelow

Above1.80

H≤1000

3.2

4.0

1000<H≤2000

3.4

4.2

2000<H≤3000

3.6

4.4

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.3.2Whentheequipotentialworkerentersorleavesequipotentialalongatensioninsulatorstring,theinsulatorstringshallbetestedfirst.ThenumberofgoodinsulatorsshallnotbelessthantheprovisionsofTable4afterthenumberofinsulatorsshort-circuitedbythehumanbodyandbadinsulatorsisdeductedfromthetensioninsulatorstring.

Table4Theminimumnumberofgoodinsulators

Minimumtotallengthofgoodinsulators/m

AltitudeH/m

Structureheightofeachinsulator/mm

Theminimumnumberofgoodinsulators

3.6

H≤1000

170

22

195

19

205

18

3.8

1000<H≤2000

170

23

195

20

205

19

4.0

2000<H≤3000

170

24

195

21

205

20

5.3.3TheminimumworkingdistancebetweentheequipotentialworkerandtheearthingconductorsshallmeettheprovisionsofTable1.TheminimumeffectiveinsulationlengthofinsulatingtoolsshallmeettheprovisionsofTable2.

5.3.4TheminimumworkingdistancebetweentheequipotentialworkerandtheadjacentliveconductorsshallmeettheprovisionsofTable5.

Table5Minimumworkingdistancebetweentheequipotentialworkerandtheadjacentliveconductors(unit:m)

AltitudeH/m

Phase-to-phasemaximumswitchingovervoltagetimes(perunitvalue)

2.80andbelow

Above2.80

H≤1000

4.6

4.8

1000<H≤2000

4.8

5.0

2000<H≤3000

5.0

5.2

Note:Thevaluesinthetabledonotincludethespaceoccupiedbythehumanbody,whichshallnotbelessthan0.5mandshallbeconsideredatwork.

5.4Workcarriedoutononepower-offcircuitofadouble-circuitlineonthesametowerwiththeothercircuitlive

5.4.1Theworkersarenotallowedtoenterthecrossarmonthelivesideorplaceanythingonthiscrossarmwhenworkingonthetower.

5.4.2Whenthepower-offcircuitpermittedbythedispatcherhasbeenchangedtothemaintenancestate(i.e.,thesubstationgroundingswitchhasbeenclosed),buttheheadendandthetailendofthecircuitarenotgroundedoronlyoneendisgrounded,thispower-offmaintenancecircuitshallstillberegardedasalivecircuit,andtheliveworkingmodeshallbeadoptedforworking.

5.4.3Whenbothendsofthecircuitaregrounded,itcanbeoverhauledbymeansofpower-offmaintenance.Theworkerontheconductorwearsafullsetofconductiveclothing(includingahat,anuppergarment,apairoftrousers,apairofgloves,apairofsocksandapairofshoes,thesamebelow),andthendirectlyentersorleavestheinsulatorstringorconductorofthemaintainedcircuit.Theworkeronthetowerbodymustwearafullsetofconductiveclothingorelectrostaticprotectiveclothingandconductiveshoes.

5.4.4Whenlayingout,withdrawingortighteningaconductoronthepower-offcircuit,measuresshallbetakentopreventtheconductorfromapproachingtheadjacentliveconductorswithinadangerousdistanceduetoswinging(jumping)orotherreasons.

5.4.5Whenoverhaulingandreplacinginsulatorstringsonthepower-offcircuitbymeansofpower-offmaintenance,theworkersshallhangandsetuppersonalsecuritycablesfirstbeforeinstallingthetools(doublehooksandleverhoists)forliftingtheinsulatorstrings.Thehanginganddismantlingmethodsofthepersonalsecuritycablearethesameasthoseofthemaintenanceearthingcable.

5.4.6Therequirementsandsafetyprecautionsforworkingonthegroundwireabovethepower-offcircuitarethesameasthosewhenbothcircuitsarelive.

5.5Workcarriedoutwithprotectivegaps

5.5.1Whentheworkingdistanceorcombinedgapofliveworkingdoesnotmeettherequirements,theworkmodeofinstallingprotectivegapsshallbeadopted.

5.5.2Theearthingcableconnectedtotheprotectivegapsshalladoptthemulti-strandsoftcopperwire,anditscrosssectionshallmeettherequirementsofgroundshortcircuitcapacity,butshallnotbelessthan25mm2.

5.5.3Whentheworkiscarriedoutwithprotectivegaps,theinsulationcoordinationbetweenthevaluesoftheworkingdistance,thecombinedgap,theminimumeffectivelengthofinsulatingtoolsandtheminimumnumberofgoodinsulatorsandthesetvaluesoftheprotectivegapsshallmeettherequirementsofDL/T876.

5.5.4Theworkerwhoinstallsordisassemblestheprotectivegapsshallwearafullsetofconductiveclothing.

5.5.5Beforetheprotectivegapsareinstalled,contactingthedispatchertostopreclosingshallbedone.

5.5.6Theprotectivegapsshallbeinstalledontheadjacenttowerstotheworklocation.Theearthingcableofeachprotectivegapshallbereliablyconnectedwiththemetalcomponentsofthetowerfirst,andthentheotherendshallbehungontheconductorofthemaintainedphase,andthecontactshallbegood.Thedismantlingprocedureisreversed.

5.5.7SeeTable6forthereferencesetvaluesoftheprotectivegaps.Beforetheprotectivegapsareused,thevaluesoftheprotectivegapsmaybecheckedandcorrectedaccordingtotheactualsizeofthetowerhead.

Table6Setvaluesoftheprotectivegaps

AltitudeH/m

Setvaluesoftheprotectivegaps/m

H≤1000

1.2

1000<H≤2000

1.4

2000<H≤3000

1.6

5.5.8Duringinstallation,thedistanceoftheprotectivegapshallbeadjustedtothemaximumvaluefirst,andthenthedistanceshallbeadjustedtothesetvalueoftheprotectivegapwithinsulatingtoolsaftertheprotectivegapisinstalledinplace.Beforetheprotectivegapisdismantled,itsdistanceshallbesetbacktothemaximumvalue,andthenitshallbedismantledaccordingtothedismantlingprocedure.

5.5.9Forthetwoupperphaseconductorsofthethreephaseconductorsarrangedinaninvertedtriangle,theprotectivegapmaybeverticallyinstalledbetweentheconductorandtheframewhichisbetweenthetwohangingpointsoftheV-shapedinsulatorstring,ormaybehorizontallyinstalledbetweenthetowerframeandtheconductor.Intermsofthelowerphaseconductor,theprotectivegapmaybehorizontallyinstalledbetweenthetowerframeandtheconductor.

5.6Safetyprotection

5.6.1Theliveworkingsafetyprotectionequipmentof500kVconventionallinesmaybeusedforliveworkingof500kVcompactlines.

5.6.2TheperformanceoftheconductiveclothingshallcomplywithGB/T6568.

5.6.3Boththeequipotentialworkerandthemid-potentialworkershallwearafullsetofqualifiedconductiveclothing,andflameresistantunderwearshallalsobewornundertheconductiveclothing.

5.6.4Thegroundpotentialworkeronthetowermustwearafullsetofconductiveclothingorelectrostaticprotectiveclothingandconductiveshoesbeforeclimbingthetower.Itisstrictlyprohibitedtowearotherclothesoverconductiveclothingorelectrostaticprotectiveclothing.

5.6.5Theoverheadgroundwireshallberegardedasaliveconductor,andtheworkersshallkeepadistanceofover0.4mfromit.Ifitisnecessarytoworkontheoverheadgroundwire,itshallbegroundedwellthroughdedicatedearthingcables.Themethodsandstepsforinstallingordismantlingthededicatedearthingcablesontheoverheadgroundwirearethesameasthoseforinstallingordismantlingtheearthingcablesonapower-offline.

5.6.6Ifitisnecessarytoentertheoverheadgroundwireformaintenance,theworkingdistanceandmechanicalstrengthoftheworklocationafterbearingconcentratedloadshallbechecked.

5.6.7Whenusinginsulatingropestotransferlargemetalobjects(includingtoolsandmaterials),theworkersonthetoweroronthegroundshallgroundthemetalobjectsbeforetouchingthem.

5.6.8Withregardtolargemetalobjects(e.g.automobiles,etc.)insulatedfromthegroundandplacednearstrongelectricfields,attentionshallbepaidtoprotectingpeoplefrominducedelectricalinjury.Thesemetalobjectsmustbegroundedbeforetheycanbetouched.

5.6Potentialtransfer

5.7.1Theequipotentialworkershallobtainpermissionfromthepersoninchargeoftheworkbeforepotentialtransfer.

5.7.2Whentheequipotentialworkertransferspotential,thedistancebetweenthehumanbodyandtheliveconductorsshallnotbelessthan0.4mItisstrictlyprohibitedtotouchtheliveconductorswithbarehandsorwithbareparts.

5.7.3Duringpotentialtransfer,theactionshallbesmooth,accurateandfast.

Enterorleaveequipotential

6.1Enterorleaveequipotentialonasuspensiontower

6.1.1Theworkershallnotenterorleaveequipotentialfromcrossarmsverticallyoralonginsulatorstrings.

6.1.2Thehangingbasket(hangingchairandhangingladder)method,theinsulatingflexibleladdermethodandothermethodsmaybeusedtoenterorleaveequipotential.

6.1.3Thehangingbaskets(hangingchairsandhangingladders)shallbestablysuspendedbyslings.Thelengthoftheslingsforfixingshallbeaccuratelycalculatedoractuallymeasuredtoensurethattheequipotentialworker’sheadshallnotexceedthegradingringontheconductorside.

6.1.4Themovingspeedofthehangingbaskets(hangingchairsandhangingladders)shallbestrictlycontrolledtoachieveauniformandsteadyspeed.

6.1.5Whenenteringorleavinghighelectricfields,theequipotentialworkershallavoidexcessivebodymovements.Alltheelectricalgapdistances(includingtheworkingdistancesandthecombinedgaps)betweentheequipotentialworkerandtheearthingconductorsandtheliveconductorsshallmeettherequirementsofChapter5.

6.2Enterorleaveequipotentialonatensiontower

6.2.1Theworkermayenterorleaveequipotentialalongtensioninsulatorstringsorviaothermethods.

6.2.2Whentheequipotentialworkermovesalongthetensioninsulatorstrings,thecross-two-short-threemethodshallbegenerallyadopted.Thepositionsoftheworker’shandsandfeetmustbekeptconsistent,andthenumberofinsulatorsshort-circuitedbythehumanbodyandtoolsshallmeettherequirementsofChapter5.

6.2.3Theequipotentialworker’ssafetybeltshallbetiedtotheinsulatorstringheldbytheworker’shandsandshallmovesynchronouslywiththeworker.

6.2.4Whenenteringorleavinghighelectricfields,theequipotentialworkershallavoidexcessivebodymovements.Alltheelectricalgapdistances(includingtheworkingdistancesandthecombinedgaps)betweentheequipotentialworkerandtheearthingconductorsandtheliveconductors,andthenumberofgoodinsulatorsshort-circuitedbythehumanbodyortoolsshallmeettherequirementsofChapter5.

Mattersneedingattentionatwork

7.1Whenliveworkingiscarriedoutonthetowerof500kVACcompacttransmissionlines,aguardianwithspecificresponsibilitymustbearrangedtostayonthetower.Dedicatedcommunicationtoolsshallbeprovidedattheworksitetoensuresmoothcommunicationbetweenworkersonandunderthetower.

7.2Whenthephase-to-groundovervoltageofthelineisgreaterthan1.80(perunitvalue),theequipotentialworkermustadopttheworkmodeofinstallingprotectivegapswhenenteringorleavingequipotentialfromthewindowofthesuspensiontower.

7.3Insulatingtoolsshallbeusedtotransferarticlesbetweentheequipotentialworkerandtheworkeronthetowerframe,andtheeffectivelengthoftheinsulatingtoolsshallmeettherequirementsofTable2.

7.4Theconductiveclothingshallbefreefromdamageandholes,andallpartsofitshallbeconnectedwellandreliably.Incaseofdamageandburrs,itshallbesenttoaqualifiedtestingunittomeasuretheresistance,fusingcurrentandscreeningefficiencyofthewholesetofconductiveclothing,anditcanbeusedonlyafterthemeasurementresultsmeettherequirementsofGB/T6568.

7.5Beforetheinsulatingtoolsareused,aninsulationresistancetester(2500V~5000V)shallbeusedtoconductsegmentedinsulationtests.Theinsulationresistancebetweenevery2cmofmeasuringelectrodesshallnotbelessthan700MΩ.

7.6Theinsulatingtoolsshallbeprotectedfrommoisture,surfacedamageandsurfacedirtwhenused.Theinsulatingtoolsnotinuseshallbeplacedoncleananddrypads.

7.7Whenfounddampened,surface-damagedorsurface-dirty,theinsulatingtoolsshallbehandledintimeandcanbeusedonlyafterpassingthetest.

7.8Beforetheworkstarts,metalscrewrods,holdersandconnectingtoolsusedforliveworkingshallbeassembledontrialandconfirmedtobeflexibleinoperationandreliableinperformance,andshallbeusedcorrectlyaccordingtoon-siteoperationproceduresorworkinstructions.

7.9Themiddlejointofinsulatinghandsticksshallnotbeseparatedandloosenedwhenbearingvariousloadssuchasimpact,push-pullandtorsion,andtheinsulatinghandsticksshallnotbeusedasload-bearingtools.

7.10Inuse,insulatingsupportsticksandinsulatingtensionsticksmustbefixedonthetowerwithdedicatedfixers,anditisstrictlyprohibitedtousethesestickstomoveconductorsdependingonthehumanbody.

7.11Whentheworkissuspendedonthetower,theinsulatinghandsticksshallbehungverticallyorlaidflatonthehorizontaltowermaterials,andshallnotbedraggedonthetowermaterials,soasnottodamagethem.

7.12Whenaninsulatinghandstickisusedonthesuspensiontower,itmaybesuspendedbyaninsulatingropeataproperpositionofthefrontpartofthesticktopreventitfrombeingexcessivelybentandreducethelaborintensityoftheworker.

7.13Thediameterofthemouthofaconductorclampshallbecompatiblewiththeouterdiameteroftheconductor,andsubstitutionisstrictlyprohibitedtopreventtheconductorfrombeingcrushedorslipping.Theradiansofthetwosemicirclesofaclosedinsulatorholdershallbeconsistentwiththeshapeofthesteelcapoftheinsulator,soastoavoidlargestressconcentrationinthestressprocess.Alldouble-wingholdersshallconformtothespecificationsofcorrespondinglinkfittings,andshallbeequippedwithbackupprotectiondevices(suchasclosingbolts)topreventthemfromfallingoff.Crossarmholdersmustadapttothespecificationsofthetowermaterials,andtheassemblyofthemshallbefirm.Thespecificationsoftensionpullersshallbedeterminedaccordingtotheloadandthetensionmode.

7.14Intheworkofreplacingsuspensioninsulatorstringsormovingconductors,whenthesinglesuspensionwiredeviceisused,thereshallbebackupprotectionmeasurestopreventtheconductorsfromfallingoff.

7.15Whenexchangingandtransferringheavytoolsupanddown,thecontrolropeshallbefastenedtopreventthetransferredobjectsfromcollidingwitheachotherandaccidentallycollidingwiththebearingtoolsintheworkingstate.

7.16Insulatingropesshallbekeptcleananddry,andshallbepreventedfromrubbingagainstthetowermaterials.Dampenedinsulatingropesarestrictlyprohibitedtobeusedinliveworking.

7.17Ifzeroandlowresistanceinsulatorsarefoundduringlivetestingofinsulators,theyshallberetested2~3times.

7.18Beforethereplacedinsulatorstringisseparatedfromtheconductor,whenthefirstinsulatornearthecrossarmisdisassembledorinstalled,adedicatedshort-circuitingwiremustbeusedbeforedirectoperation.

7.19Theequipotentialworkermusthavebackupprotectionwhenenteringorleavingequipotentialandworkingatequipotential,andthemid-potentialworkermustalsohavebackupprotectionduringwork.

Testoftools

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

8.2ThetoolsshallbesubjectedtoelectricaltestsandmechanicaltestsonaregularbasisaccordingtothetestmethodsofDL/T976.Thetestcyclesareasfollows:

a)electricaltests:preventivetestsshallbeconductedonceayear,andinspectiontestsshallbeconductedonceayear,andtheintervalbetweentwotestsshallbehalfayear.

b)mechanicaltests:preventivetestsshallbeconductedonceayearforinsulatingtoolsandonceeverytwoyearsformetaltools.

8.3Contentsandrequirementsofpreventivetests

a)Powerfrequencywithstandvoltagetest:thetestsampleshallbetestedentirely;theinsulationlengthofthetestsamplebetweenthetestelectrodesshallbe3.7m;thewithstandvoltageshallbe580kV;thetimeshallbe3min.Itisqualifiedifnobreakdown,flashoveroroverheatingoccur.

b)Switchingimpulsewithstandvoltagetest:theinsulationlengthofthetestsamplebetweenthetestelectrodesshallbe3.7m;thestandardswitchingimpulsewave(+250μs/2500μs)shallbeapplied;thevoltageamplitudeshallbe1050kV;thetestsampleshallwithstand15times.Itisqualifiedifnobreakdownorflashoveroccur.

c)Staticloadtest:aloadof1.2timestheweightoftheratedworkingloadshallbeappliedfor1min.Itisqualifiedifnopermanentdeformationordamageoccur.

d)Dynamicloadtest:3timesofac