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A娴DOC.PYX17CVI006DKS045GNSYSTEMDESIGNMANUALCHAPTER6A:B:C:√Issued ThisisthepropertyofGEDI.Itmustnotbeused,reproduced,transmittedordisclosedwithoutthepriorwrittenpermissionofGEDI.本文件之属于省电力。未获我院，任何人不得擅自使用、、传递或该文件。 ABCDEFGMainreferencePYX17CVI550DKS045DD(SeeChapter10)ScheduleofogueSensingElementsPYX17CVIN09DKS045DD(SeeChapter9.3)ScheduleofOn/OffSensingElementsPYX17CVIT09DKS045DD(SeeChapter9.3)ScheduleofElectricActuatorsPYX17CVIE09DKS045DD(SeeChapter9.3)ogueCONTROLThissystemcontainsthevacuumraisingequipmentforthetwomaincondensers.Itprovidesthevacuummeasuringequipmenttoensuresafeoperationoftheturbineandthevacuumbreakingvalvetopermitairtoenterthecondenserswhenrequiredafterturbinetrip.AirAirextractionequipmentcomprises3setsofairpumps,eachconsistingofaseparator,sealwaterpump,asealwatercoolerandanairextractionpump.Eachsetisdisconnectedfromtheairextractionmainbyanairextractionvalvewhichopensonlywhenitspumpsetisoperating,andthevalvedifferentialpressureisbelowsetvalue.Thenumberofpumpsinoperationisselectedbythecontrolroomoperator,butduringvacuumraisingallthreeairpumpscanbestarted,andwilloperateuntilvacuumisgoodenoughtopermitresettingoftheturbinetripsystem(GSE).Airextractionpumpswhicharenoton"duty"willautomaticallybecedon'stand-by'andwillautostartifanyotherextractionpumpfails.TheairextractionsystemiscontrolledbytheKIC,whichalsocontinuouslymonitorsallnecessaryparameterstoprovidealarmsandautoaction.Vacuummeasuringforturbine&NIprotectionarecarriedoutbyTGr,eachcondenserhasthreeabsolutepressuretransmittersfor2outof3functioncalculation,andthenproducesset-points,whichinterlockCVIsystemaregeneratedasfollows:CondenservacuumlowThisisalowtriplevelusedbythe -dumpsystem(GCT),andthereisanalarminKIC.Condenserpressure≤60kPaThiscondition -dumpsystemCondenserpressure≤6kPaThisisthesetpointatwhichtheairextractionsystemswitchesouttheunselectedpumpsduringvacuumraising.Condenservacuumtriptheturbine:seeTGVacuummeasuringsignalinputtoTGcontrolsystemTCS,set-pointsaresenttoDCSfromTCS.VacuumleveldependsontheturbineloadconditionattheSeeTGfile.ThesevalvesrespondautomaticallytotheirrelevantCWpumprunningsignal.ThevalvesopenwhentheCWpumpisrunningandclosewhenthepumpisABCDEFGPYX17CVI006DKS0LogicPYX17CVI006DKS0ogueDiagramsABCDEFGIDY√-A- W√-A- W√-A-W√-A-W√-A-W√-A-Y√-A-W√-A-W√-A-W√-A-W√-A-W√-A-IDY√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-W√-A-Y√-A-G√-A-IDY√-A-G√-A-Y√-A-G√-AY√-AG√-AY√-AG√-AY√-AG√-AW√-AW√-AW√-AIDDisy-CVI101VARESET√---A--√---A--AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A--CVI101VAFAULT√---A--CVI201VARESET√---A--√---A--AIREXTRACTIONVALVE√---A-IDDisyAIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A--CVI201VAFAULT√---A--CVI301VARESET√---A--√---A--AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A--CVI301VAFAULT√---A--√---A--√---A--AIREXTRACTIONPUMP√---A--CVI101PORESET√---A-ABCDEFGABCDEFGIDDisy-AIREXTRACTIONPUMP√---A--AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMP√---A--CVI101POFAULT√---A--AIREXTRACTIONPUMP√---A--CVI201PORESET√---A--AIREXTRACTIONPUMP√---A--AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMPCVI201POTRIPPOSITION√---A--CVI201POFAULT√---A--AIREXTRACTIONPUMP√---A-IDDisy-CVI301PORESET√---A--AIREXTRACTIONPUMP√---A--AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMP√---A-AIREXTRACTIONPUMP√---A--CVI301POFAULT√---A--√---A--MANUALRUN√---A--MANUALTRIP√---A-SEALWATERPUMPCVI102PORUNPOSITION√---A-SEALWATERPUMPCVI102POTRIPPOSITION√---A--SEALWATERPUMPCVI102PO√---A--SEALWATERPUMPCVI202PO√---A-IDDisy-SEALWATERPUMPCVI202POMANUALRUN√---A--MANUALTRIP√---A-RUNPOSITION√---A-SEALWATERPUMPCVI202POTRIPPOSITION√---A--SEALWATERPUMPCVI202PO√---A--SEALWATERPUMPCVI302PO√---A--SEALWATERPUMPCVI302POMANUALRUN√---A--SEALWATERPUMPCVI302POMANUALTRIP√---A-SEALWATERPUMPCVI302PORUNPOSITION√---A-SEALWATERPUMPCVI302POTRIPPOSITION√---A--SEALWATERPUMPCVI302PO√---A--CVI001VARESET√---A--√---A--AIREXTRACTIONVALVE√---A-IDDisyAIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A--CVI001VAFAULT√---A--CVI002VARESET√---A--√---A--AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A-AIREXTRACTIONVALVE√---A--CVI002VAFAULT√---A--CVI103VDOPENPOSITION√---A--CVI103VDCLOSEPOSITION√---A--CVI203VDOPENPOSITION√---A--CVI203VDCLOSEPOSITION√---A-IDDisy-CVI303VDOPENPOSITION√---A--CVI303VDCLOSEPOSITION√---A-- CVI100VDOPENPOSITION√---A--CVI100VDCLOSEPOSITION√---A--CVI200VDOPENPOSITION√---A--CVI200VDCLOSEPOSITION√---A-- CVI200VDMANUALCLOSE√---A--CVI300VDOPENPOSITION√---A--CVI300VDCLOSEPOSITION√---A--√---A--√---A--√---A--AIREXTRACTION101PO√---A--AIREXTRACTION101PO√---A-IDDisy-AIREXTRACTION101PO√---A--AIREXTRACTION101PO√---A--AIREXTRACTION101PO√---A--AIREXTRACTION101PO√---A--√---A--√---A--AIREXTRACTION201PO√---A--AIREXTRACTION201PO√---A--AIREXTRACTION201PO√---A--AIREXTRACTION201PO√---A--AIREXTRACTION201PO√---A--AIREXTRACTION201PO√---A--TEMP.(NED)√---A--√---A-IDDisy-AIREXTRACTION301PO√---A--AIREXTRACTION301PO√---A--AIREXTRACTION301PO√---A--AIREXTRACTION301PO√---A--AIREXTRACTION301PO√---A--AIREXTRACTION301PO√---A--√---A--√---A--√---A--√---A--√---A--√---A--√---A--√---A-IDDisy-√---A--FLOWLOW√---A--FLOWLOW√---A--FLOWLOW√---A--SEALWATER LEVELLOW√---A--SEALWATER LEVELLOW√---A--LEVELLOW√---A--LEVELLOWLOW√---A--LEVELLOWLOW√---A--LEVELLOWLOW√---A--√---A--√---A--√---A-NOAPPLICATIONIDUnitUnitA—LEAKAGEFLOW—A——A—SUCTIONPRESSURE—A——A—SEALWATERCOOLERCVI101EXOUTLET—A—LEAKAGEFLOW—A——A—SUCTIONPRESSURE—A——A—IDUnitUnitSEALWATERCOOLERCVI201EXOUTLET—A—LEAKAGEFLOW—A— —A—SUCTIONPRESSURE—A——A—SEALWATERCOOLERCVI301EXOUTLET—A—A— A—A—A—A—A—A—A—A—IDUnitUnitA—A—A—A—A—A—A—A—A—A—A—A—A—A—IDUnitUnitA—A—CVI201POLOCAL/REMOTE/ A—A—A—CVI202POLOCAL/REMOTE/ A—A—A—CVI301POLOCAL/REMOTE/ A—A—A—A—A—A—ABCDEFGOperatingAirExtractionTheAirExtractionSystemconsistsof3AirExtractingPumpUnitsA,BandC.EachunithasonetwostageliquidringExtractionPumpandoneSealWaterPump.SelectionoftheAirExtractionUnitsisbymeansofselector101KC,201KC,301KCinKIC.Theselectionofone,twoorthreepumpunitsfordutyautomaticallycestheremainingpumpunits(ifany)ontostandby,butforvacuumraising,allthreepumpunitsrun.Onoperationofthecontroller(001KG)inthestartposition,theairextractionpump(101PO,201PO,301PO)willrunprovideditsancillaryconditionsarecorrect:CoolingwaterflowandmotorwindingandbearingtempareCWinletandoutletvalvesareSealwaterlevelisnotWhentheairextractionpumpisrunningthesealwaterpump(102PO,202PO,302PO)willstart.Theairextractionvalves101VA,201VAand301VAwillopenassoonastheassociatedairextractionpumpisrunning,thedifferentialpressureacrossthevalvebeingalreadylessthan3.4kPawhenstartingvacuumraising.Thecondenserpressurewillcommencetofall,andonreaching6kPa(a),theairpump(s)notselectedfordutywillstop,leavingthedutypump(s)running.Ifatanytimeadutyairpumpfailsorifthedutypumpssuctionpressurerises,astandbyairpumpwillcommenceoperation,andwhenthedifferentialpressureacrossitsisolatingvalve(101VA,201VA,301VA)fallsbelow3.4kPa,theisolatingvalvewillopentoconnecttheairpumptotheextractionmain.ThesepumpsandvalvesalsocanbecontrolledindividuallybythemselvescontrollerinKICifnecessary.VacuumThisisamonitoringTherearenooperatorcontrolsforthisSeeTGfile.AirExtractionIndividualairextractionpumpunitsmaybeshutdownatanytimebydeselectingthepumpinKICusingtheselector101KC,201KC,301KCasappropriate.Thenbyoperatingthecontroller001KGinthe'start'position,onlytheairpump(s)stillselectedwillcontinueinoperation,theremainingpump(s)revertingtostandbymode.Whenthepumpunitisstopped,theairextractionpumpstops,thentheairextractionvalveclosesandthesealwaterpumpstops.Thecompleteairextractionsystemmaybeshutdownbyuseofthecontroller001KGinthe"stop"position,butonlyiftheturbinespeedislessthan1350rpm.Anairextractionpumpwillstopifanyofthefollowingfaultsispresent:Sealwaterlevellowfor300MotorwindingorbearingtempAirextractionvalvenotopenfor60Watersealpumpnotrunningfor10AstandbypumpwillautostarttorecethefaultyThesepumpsandvalvesalsocanbecontrolledindividuallybythemselvescontrollerinKICifnecessary.VacuumThisisamonitoringsystem.TherearenooperatorcontrolsforthisVacuumSeeTGOperationsinCaseofand/orUndernormaloperatingconditionsitmaybepossibletomaintaincondenservacuumwithonlyoneairextractionpump.However,ifthecoolingwatertemperaturerises,orairleakageintothecondensersincreases,thecondenserpressurewillrise.Thedutypumpsuctionpressureswitchwillbeaction,Astandbypumpwillautostarttoimprovethevacuum.Ifthecondenserpressurerisesfurther,a'condenservacuumlow'alarmwillberaisedinTCS.Thereisnofurtheractionwhichcanbetakeninthecontrolroomtoimproveonthissituationifallairextractionpumpsareoperatinganda"condenservacuumlowtrip'willbeinitiatedtosystemGCTandalarmasthepressurerisesstillhigher.Theturbinewillbetriped.Thecondensersarestillavailablefor dum(systemGCT)unlessthecondenserpressurerisesabove60kPa(a).Suctionisolationvalves001VAand002VAareinterlockedwiththeirassociatedCWpumprunningsignalandwillautomaticallycloseshouldtheCWpumpbestoppedortripped.UnitTriptoHouseThisconditionmayresultinashortbreakintheelectricalpower.Anyairextractionpumpwhichisoperatingwillexperienceareductioninspeed,butnormaloperatingspeedwillberesumedassoonastheelectricalpowerisResetFunctiononWhentherehasbeenFAULTsignalsofvalvesorpumpcontrolledbythecomputerforlongtimeandoperatorconfirmthatthecauseforthesesignalsareeliminated,operatorcanresetthroughthereset