電氣專業(yè)畢業(yè)設(shè)計外文翻譯----電力變壓器工作原理_第1頁
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1、外文資料翻譯PowerTransfmerPrinciples1.INTRODUCTIONThehighvoltagetransmissionwasneedfthecaseelectricalpoweristobeprovidedatconsiderabledistancefromageneratingstation.Atsomepointthishighvoltagemustbereducedbecauseultimatelyismus

2、tsupplyaload.Thetransfmermakesitpossiblefvariouspartsofapowersystemtooperateatdifferentvoltagelevels.Inthispaperwediscusspowertransfmerprinciplesapplications.2.TOWWINDINGTRANSFMERSAtransfmerinitssimplestfmconsistsoftwost

3、ationarycoilscoupledbyamutualmagicflux.Thecoilsaresaidtobemutuallycoupledbecausetheylinkacommonflux.Inpowerapplicationslaminatedsteelcetransfmers(towhichthispaperisrestricted)areused.Transfmersareefficientbecausetherotat

4、ionallossesnmallyassociatedwithrotatingmachineareabsentsorelativelylittlepowerislostwhentransfmingpowerfromonevoltageleveltoanother.Typicalefficienciesareintherange92to99%thehighervaluesapplyingtothelargerpowertransfmers

5、.Thecurrentflowinginthecoilconnectedtotheacsourceiscalledtheprimarywindingsimplytheprimary.Itsetsupthefluxφinthecewhichvariesperiodicallybothinmagnitudedirection.Thefluxlinksthesecondcoilcalledthesecondarywindingsimplyse

6、condary.ThefluxischangingtherefeitinducesavoltageinthesecondarybyelectromagicinductioninaccdancewithLenz’slaw.Thustheprimaryreceivesitspowerfromthesourcewhilethesecondarysuppliesthispowertotheload.Thisactionisknownastran

7、sfmeraction.3.TRANSFMERPRINCIPLESWhenasinusoidalvoltageVpisappliedtotheprimarywiththesecondaryopencircuitedtherewillbenoenergytransfer.TheimpressedvoltagecausesasmallcurrentIθtoflowintheprimarywinding.Thisnoloadcurrentha

8、stwofunctions:(1)itproducesthemagicfluxinthecewhichvariessinusoidallybetweenzero?φmwhereφmisthemaximumvalueoftheceflux(2)itprovidesacomponenttovoltagethusE=4.44fNφmSincethesamefluxlinkswiththeprimarysecondarywindingsthev

9、oltageperturnineachwindingisthesame.HenceEp=4.44fNpφmEs=4.44fNsφmwhereEpEsarethenumberofturnontheprimarysecondarywindingsrespectively.Theratioofprimarytosecondaryinducedvoltageiscalledthetransfmationratio.Denotingthisrat

10、iobyaitisseenthata==psEEpsNNAssumethattheoutputpowerofatransfmerequalsitsinputpowernotabadsumptioninpracticeconsideringthehighefficiencies.Whatwereallyaresayingisthatwearedealingwithanidealtransfmerthatisithasnolosses.Th

11、usPm=PoutVpIpprimaryPF=VsIssecondaryPFwherePFisthepowerfact.FtheabovestatedassumptionitmeansthatthepowerfactonprimarysecondarysidesareequaltherefeVpIp=VsIsfromwhichisobtained=≌≌apsVVpsIIpsEEItshowsthatasanapproximationth

12、eterminalvoltageratioequalstheturnsratio.Theprimarysecondarycurrentontheotherhareinverselyrelatedtotheturnsratio.Theturnsratiogivesameasureofhowmuchthesecondaryvoltageisraisedloweredinrelationtotheprimaryvoltage.Tocalcul

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