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1、专业英语一、词汇potentialdifferenee电位差frequencydomain频域SinusoidalACCircuit正弦交流电路Three-PhaseCircuit平衡三相电路D/A=Digital-to-Analog数模变换On-StateLosses通态损耗PowerElectronicTechnology电力电子技术transformer变压器synchronousmotor同步电动机permanentmagnet永久磁铁horseshoemagnet马蹄形磁铁excitingvolt
2、age励磁电压performancecharacteristics工作特性audiosignal声频信号instruction指令electricpowersystem电力系统nominalfrequency额定频率distributionsystem配电系统二、英译汉1.Modernpowersystemsareusuallylarge-scale,geographicallydistributed,andwithhundredstothousandsofgeneratorsoperatinginpara
3、llelandsynchronously.Theymayvaryinsizeandstructurefromonetoanother,buttheyallhavethesamebasiccharacteristics：transmitpoweroversignificantdistancestoconsumersspreadoverawidearea.Thisrequiresatransmissionsystemcomprisingsubsystemsoperatingatdifferentvoltagel
4、evels.现代电力系统通常是规模大，地域分布广，具有成百上千并列同步运行的发电机组。2.InspiteoftheinitialwidespreaduseofDCsystems,theywerealmostcompletelysupersededbyACsystems.By1886,thelimitationsofDCsystemswerebecomingincreasinglyapparent.Theycoulddeliverpoweronlyashortdistaneefromgenerators.To
5、keeptransmissionpowerlosses(I2R)andvoltagedropstoacceptablelevels,voltagelevelshadtobehighforIong-distaneepowertransmission.Suchhighvoltageswerenotacceptableforgenerationandconsumptionofpower;therefore,aconvenientmeansforvoltagetransformationbecameanecessi
6、ty.3.Mostpeoplecanformulateamentaipictureofacomputer,butcomputersdosomanythingsandcomeinsuchavarietyofshapesandsizesthatitmightseemdifficulttodistilltheircommoncharacteristicsintoanall-purposedefinition.Atitscore,acomputerisadevicethatacceptsinput,processe
7、sdata,storesdata,andproducesoutput,allaccordingtoaseriesofstoredinstructions.4.Whereasthecopperdiskwillrotateinthesamedirectionastherotatingmagneticfield,itwillneverreachthesamespeedastherotatingmagnet,becauseifitdid,therewouldbenorelativemotionbetweenthet
8、woandthereforenocurrentinducedinthecopperdisk.Thediffereneeinspeedbetweentherotatingmagneticfieldandthecopperdiskisknownasslip,whichisessentialtotheoperationofaninductionmotor.5.Switchesincludingthediodesarea
