印度某MW电厂电气作业指导书100

Non-segregatedbusduct第21页共21页InstructionforinstallationandtestNon-segregatedbusduct1.Relateddocumentationsandstandards1.1.TheChinesestandard(GBJ149-90):Codeforconstructionandacceptanceofthebus1.2.TheChinesestandard(GB50150-91):Standardforhand-overtestofelectricequipment1.3.TheChinesestandard(DL408-91):Operationcodeforpowerplantsafety1.4.TheChinesestandard(DL560-95):Operationcodeforelectricsafetyinhighvoltagelaboratory1.5.TheChinesestandard(DL/T5043-95):Designstandardforelectricallaboratoryofthermalpowerplant1.6.TheChinesestandard(DL/T5161.4-2002):Specificationforconstructionqualitycheckoutandevaluationofelectricequipmentinstallation2.Receiptandstorage2.1.Examinethestateofthedevicesandthematerialsreceivedtocheckthatitcorrespondswithwhatwasordered.2.2.Checkallpackagesforexternalsignsofdamage.2.3.Pleasecheckconditionandqualityofthedevicesandthematerials,andcomparethemwiththepackinglist.2.4.Ifonunpacking,whichmustbecarriedoutcarefully,anydamageorirregularityisnoted,notifythiswithindefiniteperiodofreceiptofthegoods,notificationmustindicatetheshippingnotenumber.2.5.Ifthedevicesistobestoredforevenshortperiodsbeforebeingputintoservice,afterreceiptitisadvisabletoputitbackintoitsrelativecontainerandcoveritwithawaterprooftarpaulin.Useadryanddust-freeambientforstoragewithoutanyaggressivechemicalagents.Placethedeviceandanyfixedpartonahorizontalsurfacenotindirectcontactwiththefloor,butonasuitablesupport.2.6.Selectalocationforthedeviceinaclean,dry,vibration-freeareawithmoderatetemperature.2.7.Withregardtolifting,followtheseinstructions:thedevicesmustbeplacedonasturdysurfaceandpreferablyliftedusinganappropriateliftingforktruck.Theuseofropesis,however,permitted:inthiscasetheliftingropesmustbehookedfirmly.3.Installation3.1.Generalrequirement3.1.1.Surfaceofthebusesmightbeneatandsmooth,withoutcrack,twistinganddeformation.Qualitystandardsofthebusmaterialsareasshownin3.1.1.Table3.1.1.:ExaminationofthebusmaterialsNameTypeMinimumtensilestrength(N/mm2)Minimumextensibility(%)Maximumresistivityat20℃(Ωmm2/m)CopperbusTMY25560.01777AluminumbusLMY11530.0290AluminumalloybusLF21Y1370.03733.1.2.Don’tblowholesonthemetalstructuresbywelding.3.1.3.Carryoutanti-corrosiontreatmentformetalstructuresandbuses.Anti-corrosionpaintmightbeuniformandsolid,withoutpeelsandcorrugation.Outdoormetalstructuresmightbehotzincplated.3.1.4.Framesofthesupportinsulators,flangesofthebushingsprotectionmeshesandcoversmustbegroundedaccordingtothecodes.Theearthedwiresmightbeneatanduniform.3.1.5.Lappingconnectionbetweenbuses,busandbranch,busandterminalofelectricequipmentshouldconformtofollowrequirement:.Copperandcopper:musttinplated..Aluminumandaluminum:canconnectdirectly..Steelandsteel:musttinorzincplated..Copperandaluminum:coppershouldbetinplatedandwithtransitiveplatesbetweencopperandaluminumwhenoutdoororairrelativehumidityisnear100%..Steelandcopperoraluminum:lappingsurfaceofsteelmustbetinplated..Lappingsurfacesoftheclosedbus-barswhicharefixedwithboltsshouldbesilverplated.3.1.6.Safetyintervalsoftheindoordistributionequipmentsduringinstallationofthebusesareasshownintable3.1.6.Table3.1.6.:Safetyintervals(mm)oftheindoordistributionequipmentsRatedvoltage(kV)0.4156.62033132and220Betweenelectrifiedpartsandgroundedpartsorfences751251803001800Betweendifferentphasesofelectrifiedparts751251803002000Betweentwosidesoffractureinthecircuitbreakersortheisolatingswitches751251803002000Betweenelectrifiedpartsandmeshfences82587593010502550Betweencrosselectrifiedpartswithoutfenceswhicharen’trepairedatsametime82587593010502550Betweennakedbuseswithoutfencesandgroundorfloors23752425248026004100Betweenparallelnakedbuseswithoutfenceswhicharen’trepairedatsametime18751925198021003600Betweenoutletbushingsandoutdoorroads400040004000400055003.1.7.Safetyintervalsoftheoutdoordistributionequipmentsduringinstallationofthebusesareasshownintable3.1.7.Table3.1.7.:Safetyintervals(mm)oftheoutdoordistributionequipmentsRatedvoltage(kV)6.62033132and220400Betweenelectrifiedpartsandgroundedpartsorfences20030040018002800Betweendifferentphasesofelectrifiedparts20030040020004300Betweentwosidesoffractureinthecircuitbreakersortheisolatingswitches20030040020004300Betweenelectrifiedpartswithoutfencesandcasingsoftransportingequipments9501050115025504550Betweencrosselectrifiedpartswithoutfenceswhicharen’trepairedatsametime9501050115025504550Betweenelectrifiedpartsandmeshfences9501050115025504550Betweenelectrifiedpartsduringliveworkingandgroundedparts9501050115025504550Betweennakedbuseswithoutfencesandground27002800290043007500Betweennakedbuseswithoutfencesandtopsofthearchitecturesorthestructures27002800290043007500Betweenparallelnakedbuseswithoutfenceswhicharen’trepairedatsametime22002300240038005800Betweennakedbuseswithoutfencesandedgesofthearchitecturesorthestructures220023002400380058003.2.Qualitystandardsinstallingthesupportracksandthehangracksofthebusesareasshownintable3.2.Table3.2.:InstallationofsupportandhangracksofthebusesExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationExaminationoftheshapesteelShapesteelspecificationInaccordancewiththedesignsCheckdependonthedrawingsPermittederrorsofstraightnessofawholeshapesteel≤5mmCheckbyaruleAppearanceoftheboltholesandsurfacesSmooth,withoutdeformationInspectionInstallationofthesupportracksandthehangracksLevelerrors≤5mmCheckbyalevelgaugeHorizontalerrorsCheckbyaruleVerticalerrorsalonginstallationdirectionDiagonalerrorsofthesupportracksFixtureofthesupportracksandthehangracksMainSolidandreliablePullPaintEliminaterustMainClean,withoutrustInspectionBrushanti-corrosionpaintUniformandperfectEarthMainSolidandconductivePullandconductanceexamination3.3.Qualitystandardsinstallingprotectivefencesareasshownintable3.3.Table3.3.:InstallationoftheprotectivefencesExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationExaminationoftheshapesteelShapesteelspecificationInaccordancewiththedesignsCheckdependonthedrawingsPermittederrorsofstraightnessofawholeshapesteel≤5mmCheckbyaruleAppearanceoftheboltholesandsurfacesSmooth,withoutdeformationInspectionManufactureoftheframesWeldoftheframesMainSolid,inaccordancewiththecodesofweldtechnologyPullandinspectErrorsoftheoutlinedimensions≤5mmCheckbyaruleDiagonalerrorsUnevennessoftheframesInstallationofthefencesExaminationofthemeshplatesEvenCheckbyaruleExaminationofthemesheyesFirmanduniformPullGapbetweentheframesandthemeshplates≤5mmCheckbyaruleVerticalerrorsofthefencesPaintEliminaterustMainClean,withoutrustInspectionBrushanti-corrosionpaintUniformandperfectEarthEarthofthefencesMainReliableearthwiththesoftconductorsPullandconductanceexaminationEarthoftheframesFirmandconductive3.4.Installationoftheinsulators3.4.1.Porcelainsandflangesoftheinsulatorsshallbeperfectandwithoutcrack,fillerscompleteatthejoints.3.4.2.Topsandcentrallinesofthepostinsulatorsshallbeneat.Itisinhibitedthatburythebottomcasesandtheflangesintoconcreteorplasterlayer.3.4.3.Padsomerubberorasbestossheetwashers,whichthicknessesarethickerthan1.5mm,betweencontactsurfacesofthepostinsulators,whichwithoutbottomcasesandcaps,andmetalfixturesforbuffer.3.4.4.Caninstallthesuspensioninsulatortrainsvertically.Stressesontheparallelsuspensioninsulatortrainsshallbeuniform.Thebolts,pins,lockspringsandetc.whichlinkupthemetalfittingsshouldbecomplete,andthosedirectionsshouldbeuniform.Theball-eyes,socket-cleviseyesandlockpinsoftheinsulatortrainsshouldbematcheachother.Installprotectivefittingsfirmlyandcorrectlyforexamplegradingrings,screenringsandetc.3.4.5.Qualitystandardsinstallingthesuspensioninsulatortrainsareasshownintable3.4.5.Table3.4.5.:InstallationofthesuspensioninsulatortrainsExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationVisualexaminationTypeandspecificationInaccordancewiththedesignsCheckdependonthedrawingsAppearanceoftheporcelainMainPerfect,smoothandclean,withoutcrackInspectionExaminationofthejointsbetweenporcelainandironMainFirmMetalfittingsandaccessoriesCompleteandperfectExaminationofthespringpinsEnoughspringPullExaminationofthegradingringsandscreenringsComplete,withoutdeformationInspectionInstallationoftheinsulatortrainsTestbeforeassemblyoftheinsulatorsMainQualifiedChecktestreportsDirectionofthebolts,pins,springpinsandetc.UniformInspectionMatchbetweentheball-eyes,socket-cleviseyesandlockpinsFlexible,withoutblockPullExaminationofanti-loosedmeasuresformetalfittingsMainTightanti-loosed,openforelockInspectionPermittedslopeanglesofthesuspensioninsulatortrains≤5ºInspectionStressesonparallelinsulatortrainsMainUniformIntegerexaminationoftheinsulatortrainsbeforeliftCleanandcorrect3.4.6.Qualitystandardsinstallingthepostinsulatorsareasshownintable3.4.6.Table3.4.6.:InstallationofthepostinsulatorsExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationVisualexaminationAppearanceoftheporcelainMainPerfect,smoothandclean,withoutcrackInspectionExaminationofthejointsbetweenporcelainandironFirm,withoutseamsInstallationoftheinsulatorsHorizontalerrorsoftheinsulatorbottomcases≤5mmCheckbyaruleErrorsofcentrallinesofthepostinsulatorsinstraightsegmentsMain≤2mmCheckbyaruleVerticalerrorsofthepostinsulatorsinlapmannerThicknessofthewashersbetweencontactsurfacesofmetalsandporcelaininsulatorsMain≥1.5mmFixtureoftheinsulatorsMainCompletebolts,tightfixtureCheckbyawrenchEarthLineoftheearthedwiresUniformdirectionInspectionConnectionwiththeearthednetworkMainSolidandconductivePullandconductanceexamination3.5.Installationofthewallbushings3.5.1.Porcelainsandflangesofthewallbushingsshallbeperfectandwithoutcrack,fillerscompleteatthejoints.3.5.2.Topsandcentrallinesofthewallbushingsshallbeneat.Itisinhibitedthatburythebottomcasesandtheflangesintoconcreteorplasterlayer.3.5.3.Diametersofholesforinstallthewallbushingscanbemore5mmandabovethanthatofembedparts.Thicknessesoftheconcreteplatescan’texceed50mm.3.5.4.Don’tmakeclosedmagneticcircuitsaroundthewallbushingswhichratedcurrentsare1500Aandabovewhenfixthemonsteelplatesdirectly.3.5.5.Theflangescanupwheninstallthewallbushingsvertically,anditoutsideifhorizontally.3.5.6.Usenon-magneticmaterialsformetalclampersatendsofthewallbushingswhichratedcurrentsare600Aandabove.Connectfirmlythemetalclamperstothebuses.Thicknessesofthemetalclamperscanmorethan3mm.3.5.7.Noleakageontheconservatorsandoilpipesforsamplewheninstalltheoil-filledbushingshorizontally.Installthevalvesforoilinjectionandsampleatinspectionside.Oilinthebushingsmustbequalified.3.5.8.Thebushingsandsparevoltagesampleterminalsshouldbeearthedwiththeearthedterminals.3.5.9.Qualitystandardsinstallingthewallbushingsareasshownintable3.5.9.Table3.5.9.:InstallationofthewallbushingsExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationVisualexaminationAppearanceoftheporcelainMainPerfect,smoothandclean,withoutcrackInspectionExaminationofjointsbetweenporcelainandironMainFirmjoint,withoutseamInstallationofthebushingsMatchbetweenpreparedholediametersandembedpartsofthebushings>5mmCheckbyaruleThicknessesoftheconcreteplatesforinstallation≤50mmSteelplatesforfixtureof1500AandabovebushingsWithoutclosedmagneticcircuitsInspectionLocationoftheflangesInstallverticallyUpInstallhorizontallyOutside600AandabovebushingsMetalclampplatesatendMaterialsoftheclampplatesMainNon-magneticmaterialsInspectionThicknesses≥3mmCheckbyaruleEquipotentialconnectionbetweenthemetalclampplatesandthebusesMainFirmandreliableInspectionOil-filledbushingsExaminationofsealMainWithoutleakageInspectionIndicationofoillevelsMainNormalBoltsforconnectionMainCompleteandtightCheckbyawrenchEarthterminalsandsparevoltagesampleterminalsMainEarthreliablyPullandconductanceexamination3.6.Installationofthehardbuses3.6.1.Thebusissuppliedbythemanufacturer,formingacompletesetwiththeswitchcabinetorotherequipments.Thesurfaceofbusesshouldbecleanandsmooth.Theremustnotbeanycrack,foldline,thingsmingledwith,orthephenomenonofdeformationandsprainbendingonthebussurface.3.6.2.Thebusassemblingandconnectingshouldproceedaccordingtotheseriesnumberofbusassemblysuppliedbythemanufacturer.Thephaseorderoferectedbusshouldbeidenticalwiththatofthesystem.Thephasesymbolwrappingshouldbeobviousandingoodcondition.3.6.3.Theerectionofjoiningsurfacesintheboltconnectionbetweenbusandbus,orbetweenbusandtheterminalofelectricaldeviceshouldmeetthefollowingrequirements..Thecontactsurfacesofbusesshouldbekeptcleanandappliedacoatofelectricpowercomplexgreaseafterbeingprocessed..Whenthebusishorizontallyplaced,therunthroughboltsshouldrunupwardfromtheunderneathofthebus.Intheothercircumstances,thenutsshouldbeplacedatthemaintenanceside.Thelengthoftheboltshouldbelongenoughsoasforthebolttoemergeoutofnut2-3threads..Atthetwooutersidesofthebusesconnectedbytherunthroughbolt,platewashersshouldbeplaced.Thenetclearancebetweenadjacentboltwashersmustbeover3mm,andatthenutsidespringwasherorjamnutmustbeused..Theboltsshouldreceiveevenforce.Extrastressshouldnotbeappliedtotheconnectionterminalofelectricaldevice..Thecontactsurfacesofbusesshouldconnecttightly,usemomentwrenchtofastentheconnectingbolts,thevalueofthefasteningmomentshouldbeinaccordancewiththeregulationintable.Table.:Fasteningmomentvalueforsteel-madeboltsBoltspecification(mm)Momentvalue(N·m)M88.8~10.8M1017.7~22.6M1231.4~39.2M1451.0~60.8M1678.5~98.1M1898.0~127.4M20156.9~196.2M24274.6~3.Fasteningbusesonthepropinsulatorshouldmeetthefollowingrequirements..Thefixationoffasteningmetallicarticlesofbuswiththepropinsulatormustbesmoothandfirm.Donotletthebus,proppedbytheinsulator,receiveextrastress..Thefasteningmetallicarticlesorothersupportingmetallicarticlesofalternatecurrentbusmustnotformaclosedmagneticcircuit..Whenthebusishorizontallyplaced,theupperpressingboardofthebussupportingsplintshouldkeepaclearanceof1-1.5mm,withthebus,whilethebusisverticallyplaced,theupperpressingboardshouldkeepaclearanceof1.5-2mmwiththebus..Thedeadpointoffasteningbusonthepropinsulator,shouldbesetoneoneachsection,andbelocatedatthemiddlepointoftheentirelengthofthebussectionoratthemiddlepointoftwobusexpansionjoint..Thebusfasteningdevicesshouldbenoedgesandcornersorbur.3.6.5.Forthemultiplepiecerectanglebus,aclearanceofnotlessthanthethicknessofthebusshouldbekeptbetweenthem.Thespacebetweentheedgesoftheadjacentspacermustbemorethan5mm.3.6.6.Theleastsafetydistanceoferectedbustothegroundmustbenolessthan125mm.3.6.7.Afterthebushasbeenerected,thebusroomshouldbecleanedup.Usea2500Vmeg-ohm-metertochecktheinsulationresistancebetweeneachphaseofbusandtheinsulationresistanceofbustotheground.Generally,thevalueshouldnotbelessthan1MΩ/kV.Inthemeantime,erectioncheckrecordshouldbemade.3.6.8.Smallbuserection.Beforeerection,thesmallbusshouldbeleveledandstraightened,andsheathedwithplastictube;atbothsideofthesmallbusthereshouldbeatagmarkedwithitscodeorname.Thewritingmustbeclearandnoteasytodropoff..Theelectricalclearancebetweentheexposedcarryingcurrentpartsofthesmallbusatthetopofthecabinetthatareoutofphaseorofpoleorbetweentheexposedcarryingcurrentpartandthenon-insulatedmetallicobject,shouldnotbelessthan12mm;theelectricitycrawlingdistanceofthemshouldnotbelessthan20mm.3.6.9.Weldofthehardbuses.Argon-arcweldaluminumoraluminumalloybuses..Withoutoxidationfilms,water,greaseandimpurityonsurfacesofthebusesandtheweldingrods.Withoutfragmentandspewongroove..Alignthehardbusesstraightlyandevenlybeforeweld.Benddegreeshouldbelessthan0.2%,anddeviationofcentrallinesthan0.5mm..Reinforceheightsatthebuttweldseamsare2~4mm,thatatangleweldseamsare4mm.Thelengthsoftheweldseamsshouldbemorethan2timeswidthsofthebuseswhenlapweld..Sizesoftheweldingcratersareasshownintableandthegapsbetweenpipebusesandlinerpipesshouldbelessthan0.5mmwhenbuttweldaluminumoraluminumalloyshardbuses.Table.:CratersizesofbuttweldingBuscategoriesBusthickness(mm)Gaps(mm)Thicknessofobtuseedges(mm)Grooveangles(º)Rectangularbuses<5<251~21.565~756.3~12.52~41.5~265~75Pipebuses3~6.31.5~2160~656.3~102~31.560~7.Undercutdepthsmustn’texceed10%ofthebusthicknessandtotalundercutlengthmustn’texceed20%oftotallengthsoftheweldseams.3.6.10.Qualitystandardsinstallingpipebusesareasshownintable3.6.10.Table3.6.10.:InstallationofthepipebusesExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationAluminumalloypipesandfittingsVisualexaminationofthealuminumalloypipesSmooth,withoutcrackInspectionAluminumalloyhatchesNeat,perpendiculartotheaxesCheckbyaruleFlexureofthealuminumalloypipesInaccordancewiththecodesCheckdependonthecodesExaminationofthemetalfittingsSmooth,withoutdamageandcrackInspectionWeldingofthepipebusesWeldingmannerMainArgon-arcweldingInspectionSizesoftheweldingcratersMainInaccordancewiththecodesCheckdependonthecodesTreatmentofthegroovesTreatsurfacesin50mmrangesattwosidesofthegroovesClean,withoutoxidationfilmsInspectionTreatedsurfacesofthegroovesMainWithoutfragmentandspewAlignmentofthehatchesBenddeviation≤0.2%CheckbyaruleDeviationofcentrallines≤0.5mmLinerpipesLocationoflongitudinalaxesMainAtcenterofthehatchesCheckbyaruleGapsbetweenthelinerpipesandthepipebuses≤0.5mmExaminationoftheweldseamsHeightofweldseams2mm~4mmCheckbyaruleAppearanceofweldseamsMainInaccordancewiththecodesInspectionInstallationofthepipebusesConnectionofthemetalfittingsMainWithoutclosedmagneticcircuitsInspectionFixtureofthemetalfittingsNeatandsolidInspectionIntervalsbetweentheweldseamsandthesupporters≥50mmCheckbyaruleGapsbetweenthebusesandbearingbracketsoftheslidetypesupporters1mm~2mmAppearanceoftheexpansionjointsMainWithoutcrack,breakandwrinkleInspectionAnti-coronadevicesatendsofthebusesSmoothsurfaces,withoutfragmentandspewInspectionPipeaxesofthethreephasebusesParalleleachotherInspectionExaminationofthegradingringsandscreencoversMainCompleteandsolid,withoutdeformationIntegerexaminationIntervalsbetweenelectrifiedconductorsandotherbodiesInaccordancewiththecodesCheckdependonthecodesRemarksofphasecoloronthebusesCompleteandcorrectInspection3.7.Installationofthenon-segregatedbusducts3.7.1.Thesequenceofinstallingnon-segregatedbus-ducts:Unpackingandcheckingofthedevices→Measurecentrallineandelevationofthefoundations,drawlines→Installsupportconstructionofthecasings→Positiontheoutgoingterminalcases→Positionthemainbus-ducts→Regulateandfixthemainbus-ducts→Installthewallbearingstructure→Positionthejointsofthebus-barsandcasings→Hardconnectionforbus-ducts→Softconnectionforbus-ducts→Groundingofthecasingsandthesupports→Clearanceinsideandsealairtight→Testcoordinately.3.7.2.Handling,unpacking,checkingofthenon-segregatedbus-ducts..Checkcarefullythebus-ductsanditsaccessoriesinboxesaccordingtotheoverallassemblydetail,thepartialassemblydetails,theshippingorderandthequalitycertificateofthenon-segregatedbus-ducts..Theboxesofdevicesshallbehangedatspecifiedpoints.Usesoftropesorsteelcableswithrubbersheath.Itisprohibitedtoshockandpullonground..Checkquantityofthedevicesanditsaccessories.Handlethemintimeiftheydamagedduetoshipment,andetc.3.7.3.Measureandrevisecentrallineandelevationofthefoundations.Checkfollowingdimension,accordingtothedesigndrawings,aligningtheterminalsofthetransformerandtheholesonwalloftheturbinehouse,fractionalerrorshallnotexceed±3mm/m,overallerrorshallnotexceed±5mm,orelserevising..Measurelongitudinalandtransversecentrallinesofthetransformers..Measurelongitudinalandtransversecentrallinesoftheswitchgears..ChecklocationanddimensionoftheholesonwalloftheturbinehousecolumnA..Maketheblacklinesasthecentrallinesofthenon-segregatedbus-ductsonindoorplatformandoutdoorsteelstructure.3.7.4.Installthesupportstructureofthecasing..Fixthesupportsbyweldingfirmly..Checktheelevationofthetopsofthebus-ductsupportsaccordingtodesignsanddrawingsfromthemanufactory..Installsteelstructuresofthenon-segregatedbus-ducts..Installthejointforverticalsectionandthesuspendingrodofthecasingsaccordingtodesigndrawings.3.7.5.Positionthebus-ductsanddevices..Assemblethesealequipmentsinsidethebus-ductsandcoatfluidsealantatthejointpriortoremovethebus-ductstotheinstallationsite..Checkthephasesequence,thenumbersandtherelativepositionsofallsectionsofbus-ductsaccordingtothedrawingsfromthemanufactory..Takethefalse-workoutsidetheturbinehousecolumnA.Thefalse-workshallbeprotruded1mfromthebus-ductattwosides..Installtheturretsonlowvoltagesideoftheunitorstationtransformer.Takethefalse-workoutsidetheturbinehousecolumnA,anditshallbeprotruded1mfromthebus-ductontwosides,itselevationisthesameasthesteelstructuresofbus-ducts..Overallregulationshallbecarriedoutafterputtingallmainbus-ductsontotheposition,checkdistancebetweenthebus-ductsofdifferentphases,ensurethatthebus-ductsbetweentheswitchgearsandthetransformersisstraightandinrightangles,checkelevationofcentrallineofthebus-ducts,ensurethatconnectionbetweenthebus-ductsandthetransformersortheswitchgearsarecorrect.3.7.6.Installationofthewallbearingstructure.InstallthewallbearingstructureonthecolumnAwallsaccordingtodrawingsofthebus-ductmanufactory..Weldthewallbearingstructureatoutdoorsideinordertosealafterassemblyofthebus-ducts.3.7.7.Adjustmentofthebus-ductsinallowableerror.Assemblycanbecarriedoutseparatelyinordertofacilitateadjustmentofdimension.Considerrequirementforwholeconnectionduringassembly.Whenerroroccur,errorshallbedistributedintoalljoints,shallnotbeconcentratedononejoint.Bus-ductsshallnotberevisedarbitrarily..Thebus-ductsshallbeputcorrectlyaccordingtothetablefordistributionofthesections,thedirectionandmarkfornumberingofthephasesequence.Longitudinalgapbetweencasingsofallphasesshallbedistributeduniformly..Thebus-barsandthecasingsshallbeconcentric,anderrorshallnotexceed5mm.Adjacentbus-barsandcasingsshallbealigned.Bus-barsandcasingsshallnotbestressedextraafterconnection..Checkandrecordinsulationresistancebetweenbusconductorsandcasingsafterassemblyofallbus-ducts..Theconstructionsiteshallbecleanduringassemblyofthebus-ductsinordertoprotectthebus-ductsfromdust.3.7.8.Hardconnectionforbus-ductsandcasings.Hardconnectionforbus-ductsshallbecarriedoutaccordingtodrawings..Checkifallpartsareinstalledcompletely,ifdimensionandpositionofallpartsarecorrect,priortoconnectthebus-barsandcasings..Removepaintandoxideonsurfacewithemerypaperorwirebrush,orcleanitwithalcoholorothercleanerpriortoconnection.3.7.9.Connectionofthegroundwire.Allsteelstructuresofthebus-ductsshallbeconnectedwiththegroundstrapusing95mm2groundwires..Theoutgoingterminalcaseofthegeneratorandallshortcircuitplatesofcasingsshallbeconnectedwiththegroundstrapusing95mm2groundwires..Thegeneratorneutralpointcubicle,PT&arrestercubicleshallbeconnectedwiththegroundstrapusing95mm2groundwires..Allexpansionjointsandsoftconnectionofthebus-ductsmustbeconnectedreliablyinordertoensurecontinuanceandcompletenessofthecasings.3.7.10.Cleaninside,close..Clearoffsmearandforeignmatterfrominnerwallofthecasings,surfacesoftheinsulators,andtheinnerconductorswithcleancottoncloth.Therearen'tanyforeignmattersinthebus-ducts.Blowdrypressedairintothebus-ductssoastocleandust..Theworkersshallweartheworkclotheswithoutbuttons,weartheworkcap,andweartheshoeswithsoftsoles,whentheyenterthebus-ducts.Thecleaningtoolsshallberecordedandtakeoutall.Avoiddamageinnerpartssuchastheinsulators..Thebus-ductsshallbecheckedandaffirmedbytheleadersofthesupervisorydepartment,theownerandtheconstructioncompanie