外文翻译基于单片机的油浸式变压器温度监测系统的设计.docx
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外文翻译基于单片机的油浸式变压器温度监测系统的设计.docx
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外文翻译基于单片机的油浸式变压器温度监测系统的设计
中文3925字
毕业设计(论文)外文参考资料及译文
译文题目:
基于单片机的油浸式
变压器温度监测系统的设计
学生姓名:
学号:
专业:
通信工程
所在学院:
指导教师:
职称:
2010年12月28日
DesignofTemperatureMonitoringSystem
forOil-immersedPowerRansformersBasedonMCU
SuxiangQianHongshengHu
DepartmentofMechanicalandElectrical,UniversityofZhejiangProvince,China
E-mail:
jjqsx@
Abstract:
¨CWiththeexpansionofelectriccapacityandlarge-scaleextensionofpowergrid,electricequipmentisplayingasignificantroleinmodernlife.Atpresent,thetechnologyofconditionmonitoringandfaultdiagnosingofpowertransformerhasbeenmadesomeimprovement,yetitsreal-timeperformanceandreliabilitystillcan'tmeettherequirementofsafeproduction.Duetodifferentthermaleffectsledbythenaturalorfactitiousfault,itstemperatureofoil-immersedpowertransformersiseasytochangeabnormally.Anon-linemeasuringandcontrollingsystembasedonMCUisdiscussedinthispaper.Inordertosatisfytherequirementofstatemonitoringandfaultdiagnosisofpowertransformeronreal-timeandreliability,akindofintelligenton-linemonitoringinstrumentisdesigned.Eachofitspartisexplainedinthispaper,includingtemperaturesignalcollectinganddataprocessingsystem.Thesimulationresultshowedthedesignedsystemwasgoodinitsreal-time,reliabilityandrunningcost.Therefore,thedesignedstatemonitoringsystemfortemperatureandfaultdiagnosisofpowertransformercanbewidelyusedinengineeringandisexpectedtobringabrightfuture.Keywords¨COil-immersedPowerTransformer,Temperature,Dataprocessing,MCU
I.INTRODUCTION
situation.Thereareseveralmethodstomeasurethehotspottemperature.AsimplemethodisthattheWiththecontinuousdevelopmentofeconomy,thetemperaturesensorcanbeusedtoconverttemperaturepowerindustryinourcountryhasenteredintoanewsignalintotheelectricsignalandthenthesamplingdatastageofdevelopment.Powertransformerhasbeenoneofcanbecollectedbytheinstrument.Inthispaper,athemostimportantequipmentsinelectricpowersystem.real-timetemperaturemonitoringsystemforAnditssafetyrunningplaysagreatimportantroleinoil-immersedpowertransformersisdesigned.Theordertoensuretheelectricpowersystem'sreliability.Atdesignedmonitoringsystemcaneffectivelymonitorpresent,theoilgasvalueandthesignaloflocaldischargesomekeyarea'stemperaturevariation:
suchastheboxareoftenselectedasthemonitoringobjectsinthebody,thetransformerwinding,theironcore,andsoon,monitoringsystemofpowertransformer.Theanditplaysasignificantroleinsupervisorycontroltothecharacteristicgasesdissolvedinoilcanbemonitoredinoperationsituationoftransformers.realtime,whichcanhelpmonitoringpowertransformer'srunningstation.But,itcannotsatisfyinspection'srequirementofpowertransformer.Besides,thesignaloflocaldischargecanbeusedtojudgesomeA.Overallplanofthedevelopedsystemfault'slocation,yetitsreal-timeperformanceisweak.
Basedonthetemperaturefieldinformationofpowertransformers,thisresearchsupportedbyNSFCexploresanewconditionmonitoringandfaultdiagnosiswayforit.Anon-linetemperaturemonitoringsystemofoil-immersedpowertransformersbasedonMCUisdesignedinthispaper.Itsvariationoftemperatureinpowertransformeroftenkeepsafixedorderlinesswhenitisrunningnormally.Inmostsituations,itsvariationoftemperatureinpowertransformerhasacloserelationshipwithdifferentfaulttypes.
Theinteriorfaultpatternsofoil-immersedtransformerarereferringtomechanism,heatingandelectricity,andmainlythelattertwo.Themachinerymalfunctionoftenispresentedintheformofthermalorelectricity.Accordingtotheinvestigationresultpresentedinthetable1,themalfunctionwaysfortherunningoil-immersedtransformersincludemainlytheoverheatingmalfunctionanddischargingmalfunctionofhighenergy.
Thetemperaturerisingwilloccurinsomelocationswhenoverheatmalfunctionorhighenergydischargingmalfunctionoccurs.Furthermore,anobviouemperaturerisingwilloccurforsomepowertransformersbeforethemalfunctionareformed.Onconditionthatthereal-timemonitoringtothecorrectareascanberealized,apreventivemaintenancewouldalterthepresentmaintenanceandinspectionmode,andbeabletoreducetheMaintenanceCost.Therefore,itisveryimportanttokeepthepowertransformersinthebestsituation.Thereareseveralmethodstomeasurethehotspottemperature.Asimplemethodisthatthetemperaturesensorcanbeusedtoconverttemperaturesignalintotheelectricsignalandthenthesamplingdatacanbecollectedbytheinstrument.Inthispaper,areal-timetemperaturemonitoringsystemforoil-immersedpowertransformersisdesigned.Thedesignedmonitoringsystemcaneffectivelymonitorsomekeyarea'stemperaturevariation:
suchastheboxbody,thetransformerwinding,theironcore,andsoonanditplaysasignificantroleinsupervisorycontroltotheoperationsituationoftransformers.
II.HARDWAREDESIGN
A.Overallplanofthedevelopedsystem
Itsfunctionofthedesignedhardwaremainlyincludestwoparts:
datacollectingandtransferringBesides,thecontrollingcircuitcanbefurtherexpandedinordertocontrolsomeprotectorsbyusingtherelayswitch.Thedesignedprinciplesareexplainedasfollows:
themonitoredphysicalquantitiesmustbefirstlysampledbythetemperaturesensor(PT100,electricthermo-couple,opticalfibersensoretc)andconvertedintothevoltagesignal,thenthesampledvoltagesignalscanbeadjustedbyregulativesignalcircuittothestandardsignal'srange,andareconvertedintodigitalsignal,aftergenerallinetransmissiontoMCUforstorageandprocessing,simulation/digitalconvertingratecanbecontrolledbyMCU.ThetakeoverdataqueenmayexisttemporarilyintheextendedRAM,ortransfertothecomputerbyUSB.Atthesametime,MCUconnectkeyboardandLCDforthepurposeofman-machineexchange[2].ThesystematicblockdiagramofhardwaresystemisshowedinFig.1.
1)ChipsSelection:
A/Dmoduleselection--MAX125Inordertoavoidadditionalphasedifferenceintheprocessofthedatacollecting,thesynchronismcollectingtechnologymustbeguaranteedfordifferentsignals.AsynchronizedatasamplingchipMAX125theMAXIMcompanyproducesisselectedandusedinthedesignedcircuit.MAX125is2¡Á4channel,high-speedand14digitdatacollectchip[3].USBinterfaceschipchoose--PDIUSBD12PDIUSBD12hereinafterreferredto"D12",supportingmultiplexing,non-multiplexingandDMAtransfer,isonekindofparallelinterfacechipdesignedbyPhilipscompany.ItfullyconformstotheUSBspecificationRev.1.1(basicspeed).Itisalsodesignedtobecompliantwithdifferenttypesoftransmission.ThedatacollectingpartsblockdiagramsofhardwaresystemseeFig.2.
Fig.2Cireuitblockdiagramofdataacquisition
Fig.1BlockDiagramofhardwarecircuitsystem
Fig.4Resistingalissingfilter
Fig.3Schematicdiagramofisclationampliicationcireuit
B.DesignoftheSignalConditioningCircuit
TheSignalConditioningCircuitiscomposedofsensor,signalamplificationandattenuationcircuit,isolationcircuit,wavefilteringcircuit,sampleholdingcircuit,etc.DuetoMAX125ADchipwithmultiplexerandSample-HoldCircuititself,SignalConditioningCircuitismadeupwiththermocouple,isolatingamplifiercircuitandanti-aliasingfilter.ThethermocoupleproducedbyAnhuiTiankangincorporatedcompany,ModelfortheWRC,IndexingforT,isaspecialoneforpowerstationapplication.Itsoutputtingvoltagerangeis¡À5Vanditsmeasuringtemprangesfrom50to200.TheAD204isageneral-purposeusedindustrystandardisolationamplifier,withtwo-port,transformer-coupledisolation.Besides,itcanofferacompletelyisolationfunction,includingsignalandpowerisolation,yetitspackageiseasilycompated.Figure3isitsprincipleofthedesignedisolatedenlargecircuit.Intheactualrunningscene,thecircuitmustdrawnearthesignalsourceinordertoavoidthesignalaffectedbyambientnoiseandenhancethesignal-to-noiseratio.
Wavefilteringcircuitadoptresistaliasingfilter,thecircuitdesignedisshowsasFigure4.Duetotheconditionalityofchoosingcapacitance,thenumericalvalueofcapacitanceistakenintoaccountfirstly.ThefilterdesigningsoftwareFilterLabofMicrochipcorp[6]isusedinthispaper.Usingthesoftware,thescopefrequencyresponseandphasefrequencyresponsecanbeexpedientlyfound,andthedesignparametercanbeeasilyadjusted.
C.Designofdatacollecting
Inordertoconstructan8-channel-synchronismA/Dconvert,therearetwopiecesofMAX125inthedesigneddatacollectingcircuit.Thelow8outputdigitalfromMAX125throughAD0~AD7arerespectivelyjoinedwithP0.0~P0.7ofW77E58.AndhighsixfiguresamountA8~A13isrespectivelylinkedwithP2.0~P2.5ofW77E58.ALEpinofW77E58holdsCLKofMAX125,andP3.3pin,P3.6pinandP3.7pinperformacontrolfunctiononMAX125component.
Fig.6USBinterfacescireuit
Fig.5MCUcontrolcireuit
D.DesignofMCUcontrolcircuit
ThecontrolsystembasedonMCUisshownasFig.6.BecausetheUSBagreementframeiscomparativelybig,W77E58chipwith32KBFlashEPROMisselectedasMCU.W77E58isthatoneis8bit,especiallyspeedyandmuchbetterperformanceCPU.What'smore,itisabletopayavisittolowspeedorfleetnessoutsideRAM.Comparedwithotherprocessingchipssuchas8052processor,W77E58canworkwithhigherspeedevenifunderthesameclockfrequencyandworkunderlowclockfreque
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