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时间:2018-07-16
《电力变压器的选择和冷却-毕业设计外文翻译篇》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、山东建筑大学毕业设计外文文献及翻译本科毕业设计外文文献及译文文献、资料题目:《SpecialEnglishforArchitecturalElectricEngineeringandAutomation》文献、资料来源:期刊(著作、网络等)文献、资料发表(出版)日期:2006.4院(部):信息与电气工程学院学院专业:电气工程与自动化班级:姓名:学号:指导教师:翻译日期:2013.6.30山东建筑大学毕业设计外文文献及翻译外文文献一:TransformerOneofthemostvaluableapparatus
2、inelectricpowersystemisthetransformer,foritenablesustoutilizedifferentvoltagelevelsacrossthesystemforthemosteconomicalvalue.Generationofpoweratthesynchronousmachinelevelisnormallyatarelativelylowvoltage,whichismostdesirableeconomically.Steppingupofthisgenera
3、tedvoltagetohighvoltage,extra-highvoltageoreventoultra-highvoltageisdonethroughpowertransformerstosuitthepowertransmissionrequirementtominimizelossesandincreasethetransmissioncapacityofthelines.Thistransmissionvoltagelevelisthensteppeddowninmanystagesfordist
4、ributionandutilizationpurposes.Atransformerisastaticdevicefortransferringelectricenergyfromonecircuittoanotherelectromagnetically,thatis,byinductioninsteadofbyconduction.Itsusualfunctionistotransferenergybetweencircuitsofdifferentvoltage.Atransformerhasamagn
5、eticcoreonwhichtherearetwoormorewindings.Thesewindingsareinsulatedfromeachotherandfromground.Inautotransformers,however,thewindingsareconnectedtogether.Theassemblyofcoreandcoilsisnormallyinsulatedandcooledbyimmersioninmineraloilorothersuitableliquidwithinane
6、nclosingtank.Connectiontothewindingsisbymeansofinsulatingbushings,usuallythroughthecover.The“ratiooftransformation”isdeterminedbytherelativenumberofturnsineachofhewindings.Thisisknownasthe“turnratio”anditistheratiooftheno-loadvoltages.Whentheunitiscarryinglo
7、ad,theratiooftheactualvoltagesisslightlydifferentbecauseofthedropcausedbytheflowof1oadcurrentthroughtheimpedanceofthetransformerwindings.Atratedload,thisdropisknownasthe"voltageregulation".Theamountofvoltagedropvarieswiththepowerfactoroftheoutputevenwhenthek
8、ilovolt-amperesremainconstant.Practicallyallpowertransformersandmanydistributiontransformershavetapsinoneormorewindingsforchangingtheturnratio.Changingtheratioisdesirable山东建筑大学毕业设计外文文献及翻译fortwor
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