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1、带Z型冷却通道的油浸式变压器绕组传热实验和模拟毕业论文外文正文1.IntroductionElectrictransformerisakeycomponentinthetransmissionanddistributionofelectricalenergy.Thereliability,lifetime,performanceanddesignoftransformersareintimatelyrelatedtoandaffectedbytheformationandtemperatureofthehottestspotinthetransformerwindingdisks
2、.Duetotherequirementinsecurityandreliability,theapplicationofmineraloilasadielectricandcoolantisbecomingincreasinglyimportanttotransformerperformance.Consequently,investigationforthehottestspotinoiltransformerwindingshasattractedparticularattentionfrombothmanufacturersandusersectors.According
3、ly,IEEEStandardC57.12.00-2000requiresthatthehottestspottemperatureanditslocationbedeterminedbyeithermeasurementorcalculationmethod.Thedeterminationofthehottestspotlocationandtemperaturebymeasurementisadauntingtaskforworkingtransformersbecauseoftheexpense,effortanddifficultyinvolved.Fromthegeo
4、metricalconstructions,transformerwindingscanbeclassifiedintotwobasicforms,layeranddisktype.Thedisk-typewindingwithzigzagcoolingductarrangementismorepopularinpractice,butadifficultyarisesinhydraulicandthermalpredictivecalculationsduetocomplexoilfluidflowpathsinit.Thepresentstudyisfocusedonthep
5、redictionofthehottestspottemperatureinthistypeoftransformerwindings.Inoiltransformer,thecoolingoilisinpracticeheatedinwindingdisksandcooledinradiators,andaveragewindingtemperatureismainlydeterminedwithoilcirculationconditionandtemperaturelevel.Inforcedoil-cooledtransformer,theoilcirculationco
6、nditionandhencecoolingcapacityismainlyaffected(suchasOF,theoilispumpedthroughthetransformer,withnaturaloilcirculationinthewindings),anddetermined(suchasOD,theoilispumpedandforcedthroughthewindings),byoilpumpinthecirculationloop,butinappropriateflowdistributionacrossthehorizontalductsmaycausea
7、localoverheatinginthewindings.Asaresult,thecouplingbetweenfluidflowandheattransferinthewindingsmustbetakenintoconsiderationfortheaccuratepredictionofthehottestspottemperatureinmagnitudeandlocation.Withnoapplicationofoilpump,naturaloilcooling(
