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1、山東建筑大學(xué)畢業(yè)設(shè)計外文文獻(xiàn)及翻譯本科畢業(yè)設(shè)計外文文獻(xiàn)及譯文文獻(xiàn)、資料題目：《SpecialEnglishforArchitecturalElectricEngineeringandAutomation》文獻(xiàn)、資料來源：期刊（著作、網(wǎng)絡(luò)等）文獻(xiàn)、資料發(fā)表（出版）日期：2006.4院（部）：信息與電氣工程學(xué)院學(xué)院專業(yè)：電氣工程與自動化班級：電氣093姓名：孫德藝學(xué)號：2009081102指導(dǎo)教師：陳紅艷翻譯日期：2013.6.30山東建筑大學(xué)畢業(yè)設(shè)計外文文獻(xiàn)及翻譯外文文獻(xiàn)一：TransformerOneofthemostvaluableappar
2、atusinelectricpowersystemisthetransformer,foritenablesustoutilizedifferentvoltagelevelsacrossthesystemforthemosteconomicalvalue.Generationofpoweratthesynchronousmachinelevelisnormallyatarelativelylowvoltage，whichismostdesirableeconomically．Steppingupofthisgeneratedvoltagetoh
3、ighvoltage，extra-highvoltageoreventoultra-highvoltageisdonethroughpowertransformerstosuitthepowertransmissionrequirementtominimizelossesandincreasethetransmissioncapacityofthelines．Thistransmissionvoltagelevelisthensteppeddowninmanystagesfordistributionandutilizationpurposes
4、．Atransformerisastaticdevicefortransferringelectricenergyfromonecircuittoanotherelectromagnetically，thatis，byinductioninsteadofbyconduction．Itsusualfunctionistotransferenergybetweencircuitsofdifferentvoltage．Atransformerhasamagneticcoreonwhichtherearetwoormorewindings．Thesew
5、indingsareinsulatedfromeachotherandfromground．Inautotransformers，however，thewindingsareconnectedtogether．Theassemblyofcoreandcoilsisnormallyinsulatedandcooledbyimmersioninmineraloilorothersuitableliquidwithinanenclosingtank．Connectiontothewindingsisbymeansofinsulatingbushing
6、s，usuallythroughthecover.The“ratiooftransformation”isdeterminedbytherelativenumberofturnsineachofhewindings．Thisisknownasthe“turnratio”anditistheratiooftheno-loadvoltages．Whentheunitiscarryingload,theratiooftheactualvoltagesisslightlydifferentbecauseofthedropcausedbytheflowo
7、f1oadcurrentthroughtheimpedanceofthetransformerwindings．Atratedload,thisdropisknownasthe"voltageregulation".Theamountofvoltagedropvarieswiththepowerfactoroftheoutputevenwhenthekilovolt-amperesremainconstant．Practicallyallpowertransformersandmanydistributiontransformershaveta
8、psinoneormorewindingsforchangingtheturnratio．Changingtheratioisdesirable山東建
