印度某MW电厂电气作业指导书43

Thelightningarrester第7页共7页InstructionforinstallationandtestThelightningarrester1.Relateddocumentationsandstandards1.1.TheChinesestandard(GBJ147-90):Codeforconstructionandacceptanceofthehighvoltageequipment1.2.TheChinesestandard(GB50150-91):Standardforhand-overtestofelectricequipment1.3.TheChinesestandard(DL408-91):Operationcodeforpowerplantsafety1.4.TheChinesestandard(DL560-95):Operationcodeforelectricsafetyinhighvoltagelaboratory1.5.TheChinesestandard(DL/T5043-95):Designstandardforelectricallaboratoryofthermalpowerplant1.6.TheChinesestandard(DL/T5161.2-2002):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.Lightningarrestersshouldnotbedismantledwillfully,sealingandcomponentpartsshouldnotbedamagewillfully.3.2.Lightningarrestersshouldbeinuprightposition,shouldnotbeinvertedorsubjectedtoimpactduringtransportationandinstorage.3.3.Carryoutfollowingchecksonarresterspriortotheirinstallation:3.3.1.Porcelainpartsshouldhavenocracksordamage,porcelainbushingsshouldbefirmlycementedtotheirflanges,andwaterdrainingholesonflangesshouldbeunimpeded.3.3.2.Explosionpreventingpadsonmagneticblastvalvetypelightningarrestersshouldnotbedamagedandhavenocrack.3.3.3.Combinedelementsshouldhavealreadypassedqualificationtests,insulationofthebaseandpullinginsulatorsshouldbegood.3.3.4.Upperandlowercoversfortheprotectionofexplosionpreventingpadsonmetallicoxidelightningarrestersduringtransportationshouldbetakenawayandthepadsshouldbeintact.3.3.5.Safetydevicesonmetallicoxidelightningarrestersshouldbeintact.3.4.Varioussectionsofanarrestershouldbeassembledinaccordancewiththeserialmarknumbersmadeinfactory.3.5.Oxidizedfilmandoildirtonmetalliccontactsurfacesshouldbeclearedaway,andcompositegreaseforelectricalequipmentsshouldbepastedonthecontactsurfaces.3.6.Whenthreearrestersforthreephasesaremountedinparallel,theircentersshouldbeonastraightline,dataplatesshouldbeputonsamesideeasyforobservation.Arrestersshouldbeinstalledverticallyconformingtomanufacturestipulation.Iftheyaresomewhatinclined,thiscanbecorrectedbyusingmetalspacersontheflangesbutagoodelectricconductivityshouldbeassuredandcrevicesshouldbefilledwithoilypasteandpainted.3.7.Pullinginsulatormustbefirmlyfixed,springsshouldbeabletostretchorcontractfreelyandpullingforceonvariousinsulatorsofsamephaseshouldbeeven.3.8.Voltageequalizingringsshouldbeinstalledhorizontallyandnotbeinclined.3.9.Dischargecountersshouldbesealedwell,operateaccuratelyandconnectedaccordingtotechnicalstipulationoftheproducts.Installationpositionisidenticalandobservationisconvenient.Groundingshouldbereliableandthecounterrecordershouldbeadjustedbacktozero.3.10.Exhaustchannelofmetallicoxidelightningarrestershouldbeunimpeded,thegasexhaustionshouldnotcauseashortcircuitbetweenphasesortoground,nordirecttootherelectricalequipment.3.11.Arresterleadconnectionshouldnotsubjecttheterminalstoanexternalforceexceedingpermissiblelimit.3.12.Gasexhaustiontypelightningarrestersshouldbesubjectedtofollowingcheckspriortoinstallation:3.12.1.Arcextinctiongapsofexhaustiontypelightningarrestersmustnotbewillfullydismantledandadjusted,theinnerdiameterofexhaustpipeopeningshouldconformtotechnicalstipulationoftheproducts.3.12.2.Theinsulatingpipewallshouldnotbedamagedorcracked,andpaintinglayernotpeeledoffandpipehatchesarenotblocked.3.12.3.Insulationshouldbegoodandqualifiedbytest.3.12.4.Fittingsarecomplete.3.13.Installationofthegasexhaustiontypelightningarrestersshouldconformtofollowingrequirements:3.13.1.Arrestersshouldbefixedonclosedpipeend,whiletheopenenddirectsdownward.Wheninstalledinclined,theanglebetweenitsaxiallineandahorizontallineshouldnotbesmallerthan15ºforordinarylightningarresters,45ºforlightningarrestershavingnofollowcurrent.Theinclinedangleshouldbeincreasedwheninstalltheminpollutedarea.3.13.2.Exhaustgasfromthearrestersmustnotcauseashortcircuitbetweenphasesortogroundandalsomustnotblowtootherelectricalequipments.3.13.3.Coversoftheoperationindicatorsshouldopendownward.3.13.4.Thelightningarrestersanditssupportingstructuresshouldbefixedfirmly.3.13.5.Thelightningarrestersshouldbeinstalledatplaceseasyforobservationandmaintenance.3.13.6.Lengthofhighvoltageleadsforthearresterswithoutfollowcurrentandthatofhighvoltageconnectionwirestoprotectedequipmentsshouldconformtotechnicalstipulationoftheproducts.3.14.Installationoftheisolatinggapsshouldconformtofollowingrequirements:3.14.1.Manufactureofisolatinggapelectrodesshouldconformtodesignrequirementsandtheelectrodesmadefromferrousmaterialshouldbegalvanized.3.14.2.Angleformedbyaxiallineoftheisolatinggapandthatofthelightningarresterpipeshouldnotbelessthan45º.3.14.3.Theisolatinggapsarebetterinstalledhorizontally.3.15.Qualitystandardsinstallingthelightningarrestersareasshownintable3.15.Table3.15.:InstallationofthelightningarrestersExaminationitemsPropertyQualitystandardsMethodsandtoolsofexaminationVisualexaminationAppearanceoftheporcelainpartsMainSmoothandcomplete,withoutcrackInspectionExaminationoftheexplosion-proofplatesMainWithoutdamageandcrackInstallationofthelightningarrestersMetalliccontactsurfacesMainClean,withoutoxidationfilm,coatcompositegreaseforelectricequipmentsInspectionLocationofthesectionsInaccordancewiththemanufactorystipulationCheckdependonthemanufactorystipulationVerticalityErrorofcenterdistancesbetweenphases≤10mmCheckbyaruleNon-linearcoefficienterrorofserial-parallelcombinationunitsinsamephaseInaccordancewiththecodesChecktestreportsExaminationofinsulationofthebasesMainHighinsulationresistanceExaminationofthedischargecountersAppearanceMainTightsealInspectionInstallationlocationUniformforthreephases,easyobservationOperationtestCorrectandreliableChecktestreportsConnectionwiththelightningarrestersMainInaccordancewithmanufactorystipulationCheckdependonmanufactorystipulationEarthofthebasesMainSolidandreliablePullIndicationofcountnumbersSamedigitsInspectionInstallationofthevoltageequalizingringsSolidCheckbyawrenchClearancebetweenthevoltageequalizingringsandtheporcelainskirtsMainUniformInspectionConnectionbetweenthewiringterminalsandtheequipmentsSolid,withoutstressforceInspectionMarkofphasecolorsCorrectandclear4.Test4.1.Measureinsulationresistance4.1.1.Methodandsequence.Disconnectallwiresbetweenmeasuredequipmentandotherobjects,thendischargebymeansofearthedwire,theperiodofdischargingshouldexceed1min..Recordthetemperatureoftheequipment..Voltagelevelsofthemeg-ohm-metersformeasuringinsulationresistanceshouldaccordwiththefollowing:use250Vmeg-ohm-metersforelectricdevicesorcircuitswhichratedvoltagesarebelow100V,500Vmeg-ohm-metersfor100V~500V,1000Vmeg-ohm-metersfor500V~3000V,2500Vmeg-ohm-metersfor3000V~10000V,2500Vor5000Vmeg-ohm-metersfor10000Vandabove..Theequipmentshouldbedischargedfullyintothegroundafterthemeasurement.Periodofdischargingshouldexceed2min.4.1.2.InsulationresistanceoftheFStypelightningarrestersshallbehigherthan2500MΩ.4.2.Measureconductingorleakingcurrent.Teststandardsofconductingorleakingcurrentsshallconformtothevaluestipulatedintable4.2.Table4.2.:ConductingcurrentofthelightningarrestersTypeRatedvoltage(kV)Testvoltage(kV)Conductingcurrent(μA)FZ34400~65066400~6001010400~6001516400~6002020400~6003024400~600FS34≤1067≤101011≤10FCD33≤10forFCD1,FCD3type,50~100forFCD,5~20forFCD24466101013.213.21515FCZFCZ3-353550250~400FCZ3-35L3550250~400FCZ-30DT3518150~300FCZ1-110J110100500~700FCZ2-110110100400~600FCZ3-110110140250~400FCZ3-110J110110250~400FCZ1-220J220100500~700FCZ2-220220100400~600FCZ3-220J220110250~400FCZ1-330J330160500~700FCZ-500J5001601000~1400FCX-500J500180500~8004.3.Checknonlinearcoefficientsofthecompositeelements.NonlinearcoefficientsαoftheFZtypearrestersarecalculatedbyfollowingformula:α=[Ig(U2/U1)]/[Ig(I2/I1)].WhereU2isthetestvoltageandU1is50%ofU2,I1andI2ismeasuredconductingcurrentunderU1andU2respectively.Differenceofnonlinearcoefficientsmeasuredbetweentheserieselementsinsamephaseshallnotbegreaterthan0.04.4.4.PowerfrequencydischargevoltagesoftheFStypevalvelightningarrestersshallconformtothevaluestipulatedintable4.4.Table4.4.:PowerfrequencydischargevoltagesoftheFStypevalvelightningarrestersRatedvoltage(kV)3610RMSvaluesofdischargevoltage(kV)9~1116~1926~314.5.Thefunctionalacceptancetestsshallbecarriedoutonthesurgecounter.5.Puttingintoservice5.1.Generaldescription5.1.1Whenfinishedwiththeoriginalinstallationandallmodifications,conductacompleteoperationtestontheentireinstallationtoverifycompliancewithapplicablestandards.Testingshouldbeconductedbyafactory-trainedtechnicianinthepresenceofarepresentativeofthemanufacturerandtheowner’srepresentative.Followproceduresoutlinedintherelatedstandard.5.1.2.Periodictestingandservicingofthesystem,alldevices,andanyotherassociatedequipmentisessentialtoensureproperandreliableoperation.Testandservicethesystemandthedeviceaccordingtotheschedulesandproceduresoutlinedinthemanufacturer’smanuals.5.1.3.Betweenformalperiodictestingandservicingintervals,therelatedoperationchecksshouldbeperformedfordefiniteperiod,orfrequentlywhenrequiredbytheowner.5.2.Followingchecksshouldbemadewhenacceptance:5.2.1.Partsmadeatsiteshouldconformtodesignrequirements.5.2.2.Appearanceofthelightningarrestersshouldbeintact,andsealsontheopeningsaretight.5.2.3.Thelightningarrestersshouldbeinstalledfirmly,andtheirperpendicularityshouldconformtorequirements.Thevoltageequalizingringsshouldbehorizontal.5.2.4.Thepullinginsulatorsofthevalvetypelightningarrestersshouldbefixedreliablyandstressedevenly.5.2.5.Thedischargecountersshouldbesealedwell,andinsulatingspacersandgroundingshouldbegoodandfixedreliably.5.2.6.Inclinedangleandisolatinggapofexpulsiontypelightningarrestersshouldconformtorequirements.5.2.7.Paintingshouldbeintactandcolormarksforphasesshouldbecorrect.6.Safetyprecautions6.1.Theinstallationhastobecarriedoutbyqualifiedpersonalfollowingtheinstructionofthemaker.Onlyqualified,authorizedpersonsshouldcarryoutelectricalwork.Wiringshouldbeperformedbythequalifiedpersonnelonly.6.2.Adisconnectswitchmustbeinstalledtobreakallcurrentcarryingconductors.Beforemakinganyelectricalconnectionensurethatthemainswitchisoff,alloftheelectricalpowerlinestotheequipmentmustbeisolated.Failuretoobservethisprecautionmayresultinseriouspersonalinjury.6.3.Allmainscablesandsignalcablesmustbeconnectedinexactaccordancewiththeoperatinginstructionstoavoidtheriskofelectricshock.6.4.Whilethedevicesarepowered,apotentiallylethalshockhazardexistsinsidethedevices.Donotopenthedeviceswhilethedevicesarepowered.6.5.Theinstrumentmustbegroundedorearthed.6.6.Iftheapparatusisdamagedoritislikelytheprotectionhasbeenimpaired,theapparatusshouldbeswitchedoffandsecuredagainstunintendeduse.6.7.Mustcarryoutfollowingprocedurebeforemaintenanceonthehighvoltageelectricdevice.6.7.1.De-energizetheelectricdevicebydisconnectingthecircuitbreakerandthedisconnectionswitchandtheoperationpowersource.6.7.2.Checkelectricitybyaqualifiedinstrument.6.7.3.Installthe