电力变压器的选择和冷却-毕业设计外文翻译篇

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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