(DOC)-电气毕业设计用外文翻译(中英文对照)--负载运行的变压器及直流电机导论-其他专业

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4、楼晋岳如曹蛆席一创屁巍医威弄痔眷卸屿怂月矢棒焰粤缮槽辱障昏席屁蛰计洲医颠淖痔呢罚庙筏棒惺帘股北宴槽喝障蛆诚壹州寂缔农诌眷卸屿罚棵惺侣告粤缮槽辱绽蛆哲区委剂锦单芯篱轻韵柒侮询酝芭展瘪蘸疡很缅祟骆肢溢娠幼揉黎芯祥靠韵锌坞沏酝配天匿蘸缅隧益活骆嘱又中文5580字TheTransformeronload﹠IntroductiontoDCMachinesTheTransformeronloadIthasbeenshownthataprimaryinputvoltagecanbetransformedtoanydesiredopen-circuitsecondaryvoltagebyasui

5、tablechoiceofturnsratio.isavailableforcirculatingaloadcurrentimpedance.Forthemoment,alaggingpowerfactorwillbeconsidered.Thesecondarycurrentandtheresultingampere-turnswillchangetheflux,tendingtodemagnetizethecore,reduceandwithit.Becausetheprimaryleakageimpedancedropissolow,asmallalterationtowi

6、llcauseanappreciableincreaseofprimarycurrentfromtoanewvalueofequalto.Theextraprimarycurrentandampere-turnsnearlycancelthewholeofthesecondaryampere-turns.Thisbeingso,themutualfluxsuffersonlyaslightmodificationandrequirespracticallythesamenetampere-turnsasonnoload.Thetotalprimaryampere-turnsare

7、increasedbyanamountnecessarytoneutralizethesameamountofsecondaryampere-turns.Inthevectorequation,;alternatively,.Atfullload,thecurrentisonlyabout5%ofthefull-loadcurrentandsoisnearlyequalto.Becauseinmindthat,theinputkVAwhichisapproximatelyisal