英文版-重琦STC系列(三相交流同步發(fā)電機)使用維護說明書

STC系列STCSERIES三相交流同步發(fā)電機THREE-PHASEA.C.SYNCHRONOUSGENERATORS使用維護說明書INSTRUCTIONSFOROPERATIONANDMAINTENANCE中華人民共和國上海重琦電力設(shè)備有限公司SHANGHAIZHONGQIMOTORSCO.LTDSTCSERIES3-PHASEA.CSYNCHRONUOSGENERATORSModleOutputModleOutputCurrent(A)polenumberSynchronousspeed(r.p.m)KVAKWSTC-5-26.35923000STC-33.835.441500STC-56.35941500STC-13.541500STC-1012.51018.141800STC-12151221.741500STC-1518.51527.141500STC-20252036.141500STC-3037.53054.141500STC-40504072.241500STC-5062.55092.241500STC-64806411541500STC-7592.87513641500STC-90112.59016241500STC-10012510018141500STC-12015012021641500STC-150187.515027041500Itisofthree-phasewithneutralpointstarconnection,characterizedbyalinevoltagaof400V,phasevoltageof230V,frequencyof50Hz,andpowerfactorof0.8(lagging).Wecanprovidewith60Hzandothervaluegeneratorswhichtheusersarenecessity.Theconnectionofthegeneratortotheprimemovermaybemadedirectlyorbymeansofatrianglebelt.Itsrotationcanbeinbothpositiveandoppositesenseforcontinuousratedduty.Inordertopermitthemaohinetoproducecurrentinitsnormalrunning,itiswell-advisedtogetyourselfinformedfromthepresentinstructionmanualbeforehand.1.SPECIFICATIONSANDCHARACTERSTICS-1-Inthisseriesofgeneratoraharmonicexcitationisadopted.Onthecoreinadditiontothemainwinding,thereisalsoaharmonicwinding.Thecerrenttoberectified,afterflowingthroughthe3-phasebridgesilicon-controlledrectifier,entersthemagneticfieldcoilwhereexcitationtakesplace.Solongasthethirdharmonicvoltagewillincreasecorrespondinglyupontheloadingofthegenerator,aself-excitationconstantvoltagecharacteristicisacquiredandanycomplicatedautomaticvoltageregulatorcanthusbedispensedwith.Thismachinepossessesasuperbdynamicbehaviourwhichmakespossibleanoloaddirect-onstartingofsquirrel-cageasynchronousmotorwithsimilarcapacitywythoutadditionalstartingdevice.Ⅱ.CONSTRUCTIONThegeneratorisofrotating-fieldtype.Itsframeandend-coversareallbuiltofcastiron.Thestator'scoreismadeupof0.5mmhighqualitysiliconsteellamination,whilethemagneticpole'scoreismadeupoflmmelectricalsheetstampings.High-strengthenamelledwireisusedasconductingwire,statorinsulationisofClassE,androtorinsulationisofClassB.Theoutletboxislocatedontopofthemachineframe.Intheboxareinstalledtheterminalpanelandsilicon-controlledrectifierunit.Theswitch-boxarcassembledontheframeofthegenerators.Intheswitchboxhavebeenmountedconnectingplate,siliconrectifierandfieldrheostat,withtheadditionofthefieldrheostatof30~50KW.Thereareindicatorof6.3Vandvoltemeteronthefaceplate.Thecotputcableiswiredfromoutgoinglineholeplateintherearoftheswitchbox.Whenitisinoperationbeforetheseatedfilmoftheoutgoinglineholeplatebeeaposedwiththepochetknife.ThewiringprincipolechartisshownasinFig1.InthediagramtheZ4、Z5andZ6、Z7asfortheelementarywavecoiloftheauxilliarywindingofthedifferenceturns.Bothcanreachtoadjustunloadedvoltagepurposeviachangeoverrightandreverseseriesconnectingplate.TheunloadedvoltageriseswhentheZ4、Z6connecttotheZ7、Z8.whentheZ4、Z7connecttotheZ6、Z8theunloadedvoltagegoesdown.WhentheZ4-2-connecttotheZ8,ortheZ6、Z7connecttotheZ5、Z8thatthetwoelementarywavecoilwillbeusedseparately.Theconnectingplatehasbeenconnectedbeforedelevering.Accordingtotheneedsoftheusersitcanbechangedtoconnecteiementarycoilasabovemethod.CodeNameCodeNameSPecification3~20KW12~20kw30~50kw3FieldrheostatBC1-150W10ΩBC1-150W7.5ΩBC1-500/2.5Ω5Silicondiode2CZ-5A800VZQS-20A1000V8lndicatorXD1-6.3V9Voltmeter85L1-O-500V69L13-0-500VFig.1.wiringprinciplechart1.Mainwinding 2.Harmoniccoiloftheauxilliary3.Fieldrheostat 4.Elementarywavecoiloftheauxilliarywinding5.Silicon-controlledrectifier 6.Excitationwinding7.Windingofindicator 8.Indicator 9.Voltmeter-3-Ⅲ.PRECAUTIONSTAKENPRIORTOOPERATION1.Connecttheoutputcablesontheconnectingplateintheswitchboxofthegenerator.Thesizeofthecablesshouldhaveacross-sectionlargeenoughtotransmitcurrentsafely.2.Opentheoutershieldoftherearcovertoseethattheelectricbrushesareallinnormalcondition.3.Switchesandfusesoiadequatecapacityshouldbefixedoneveryuserend.Beforestartingthemachinetheswitchesoftheuser-endsmustbeleftopen.Ⅳ.START-STOPA.Starting:1.Adjustthefieldrheostatoftheswitchboardtotheshort-circuite.i.therotatingarrowheadpointatthevoltagethatisthehighest.2.Bringtheprimemoverintooperation,whentherotatingspeedgetstotheratedvalue,thegeneratorwillimmediatelybuildupvoltagebyself-excitat-ion.Getthespeedsomewhathigherthantherotatingspeed,soastocompensatethedropofspeedtheloadisinfull.Meanwhfleadjustthefieldrheostattogettheindicatedreadingofthevoltmeterat400V.3.Turnontheuser-endswitchesfornormalcurrentsupply.B.Stopping1.Removeloadsfromtheuser-endsandcutofftheswitches.2.Stoptheprimemover.3.Adjustthefieidrheostattotheshortcircuitposition.C.Specialattention1.Takeeverycautiontopreventaganistshort-circuitingattheoutputendsofthemachine,inwhichcasetherectifierelementsmaybedamaged.2.Instopping,unloadthegeneratorfirstandthenstopit.Ifstoppingthemachinewiththeloadon,itsresidualmagnetismmaygetlostanditwillthen-4-needtoberemagnetizedbeforethenextoperatfon.3.Fieldrheostatshouldbeadjusttothepositionofshortcircuitafterstopping,avoidtobuildupvoltagetoweaknextstarting.V.TROUBLESANDTHEIRELIMINATIONFollowingarethepossiblecausesoftroublesandtheirwaysofelimination:1.Lossofresidualmagnetism.Residualmagnetismmaygetlostduetothegenerator'sbeingstoredforalongperiodoftimeorbeingstoppedwhileitisloaded.Magnetizethefieldofthegeneratorwitha12Vstoragebatteryordrybatterywhilerunning.Insodoing,thepositiveterminalofthebatteryshouldbeconnectedwithL1andthenegativewithL2.Connectioninthereversedirectionisimpermissible.2.Rotatingspeedistooslowtoattnintheratedvalue.Measuretherotatingspeedwithatachometerandthendulyincreaseit.3.Opencircuitorshortcircuitoccursinharmonicwinding,thusthereisnooutputofthirdharmonicvoltage.Checktheconnectionsofthewinding,orreplaceit.4.Rectifierelementispunctured.ThereisnoD.C.output.Replacetherectifierbyanewone.5.Fieldwindingisshort-oropen-circuited.Checktheconnectionsofthefieldwinding,orreplaceit.6.Poorcontactbetweenbrushandslipring.Cleanthesurfacesoftheslipringswithapieceofemerycloth.Ifthebrushwearoutandthespringpressureisnotverygood,shooldchangethebrush.7.Looseconnectionorpoorcontactoftheterminals.Tightenthenutsontheterminals.8.Ifthefieldtheostatwillnotbeadjustedtotheshort-circuit,itwillbepoorcontactorburntout.Checkandadjustrheostattotheshort-circuitposition.Shouldemchangeanewrheostatifitisburntout.-5-Ifitisstilldifficultfortherunninggeneratortobuilditselfupwhentheaforesaidtroubleshavebeendoneawaywith,thenyoumayapplyanadeguateloadwhichwillhelpbuildupvoltage.VI.MAINTENANCEANDREPAIRA.Generalmaintenance:1.Duringstorage,alwayskeepthegeneratorinadryplace.Ifandwhenplacedonearthyofconcreteground,itshouidbebolsteredwithwood,andcoveredwithoilclothagainstgettingdamp.2.Measuresshouldbetakentopreventdust,drippingwater,metalchipsorotherforeignmatterfromenteringthegenerator.3.Inordertoavoidobstructionofitsheatdissipation,leavenoclothesandthelikeonthemachinewhileitisrunning.4.Caremustbeexercisedtoavoidsustainedoverload.5.Ifabnormalsparkingsappearontheslipringsandunusualsoundsareheardduringoperation,correctionmustbemadeinstantaneously.6.Placeswherethereisplentyofwatervapour,dustorcombustibiegasespresentarenotsuitabiefortheoperationofthegenerator.7.Thelubricatinggeraseshouldbereplacedafterevery1500workinghoursoftheballbearings.Removetheoldgreaseandreplacewiththenewatleastonceayear.Theamounttobefilledisabouthalfthecapacityofthebearingbox.Neverusemixtureofdifferentkindsofgrease,molybdenumdisulfidelithium-basegreasebeingrecommended.Themaximumpermissidletemperatureoftheballbearingsis95℃.B.Inspectingandoverhauling:Thegeneratorshouldbeoverhauledoncetemi-annually.1.Removethewindowcoverplateandclearawaytheaccumulateddustanddirt,ifany,inthegenerator,preferablybymeansofcmpressedairatapressurenotexceeding0.4kg/cm.2.Theslipringsshouldfirstbewipedcleanbymeansofapieceof-6-coarsecloth(donotusewasteyarnorotherfibrousmaterial)slightlymoistenedwithkerosene.Afterthatwipethemdryagainwithanotherpieceofdrycoarsecloth.3.Removetheoutercoterofthebearingandfindoutwhetherthelubri-catinggreaseisslean.Ifitisfoundtobetarnishad,replaceitwithnewgrease.4.Checkthewearandtearofbrushes,whethertheconstantpressure