电力专业英语阅读与翻译 课件 20-High-Voltage Direct-Current

电力专业英语(20)High-VoltageDirect-CurrentTransmission参考教材：朱永强.电力专业英语阅读与翻译.机械工业出版社，2024-06High-VoltageDirect-CurrentTransmission1.Unlikeoverheadlines,undergroundcableisinvisible,freefromatmosphericpollution,andsolvestheproblemofsecuringrightsofway.尝试翻译翻译和架空线不同，地下电缆是看不见的，免受大气污染，并解决了安全的公用通道问题。说明unlike意思是“不像，与……不同”。freefrom表示“没有……的，免于”。rightsofway指的是公用事业用地，例如铁路线、公路线、管道线建设所需的土地。生词invisibleadj.看不见的1.Unlikeoverheadlines,undergroundcableisinvisible,freefromatmosphericpollution,andsolvestheproblemofsecuringrightsofway.High-VoltageDirect-CurrentTransmission2.DCtransmissionremainsverylimitedinusageexceptforlonglinesbecausethereisnoDCdevicewhichcanprovidetheexcellentswitchingoperationsandprotectionoftheACcircuitdevices.尝试翻译翻译直流输电除用于长线（输电）以外在应用上仍然十分有限，这是因为没有直流设备能够提供交流装置所具有的卓越的开关操作和保护功能。说明词组exceptfor表示“除……以外”。生词operationn.操作2.DCtransmissionremainsverylimitedinusageexceptforlonglinesbecausethereisnoDCdevicewhichcanprovidetheexcellentswitchingoperationsandprotectionoftheACcircuitdevices.High-VoltageDirect-CurrentTransmission3.ThedirectionandamountofpowerintheDClineiscontrolledbytheconvertersinwhichgrid-controlledmercury-arcdevicesarebeingdisplacedbythesemiconductordevices.尝试翻译翻译直流线路上功率的流向和数量用换流器控制，其中栅控汞弧设备正在被半导体整流器取代。说明arebeingdisplaced是现代进行时的被动语态，表示“正在被取代”。生词mercuryn.汞3.ThedirectionandamountofpowerintheDClineiscontrolledbytheconvertersinwhichgrid-controlledmercury-arcdevicesarebeingdisplacedbythesemiconductordevices.High-VoltageDirect-CurrentTransmission4.Moreexactly,convertersatthetwoendsoftheDClinesoperatebothasrectifierstochangethegeneratedalternatingtodirectcurrentandasinvertersforconvertingdirecttoalternatingcurrentsothatpowercanflowineitherdirection.尝试翻译翻译更为准确地说，直流线路两端的换流器都既可作为整流器将产生的交流变为直流，也可作为逆变器将直流转换为交流，从而功率可以向每个方向流动。说明bothas…andas表示“既可作为……又可作为”。句式sothat表示“从而，因而”。生词convertern.换流器4.Moreexactly,convertersatthetwoendsoftheDClinesoperatebothasrectifierstochangethegeneratedalternatingtodirectcurrentandasinvertersforconvertingdirecttoalternatingcurrentsothatpowercanflowineitherdirection.High-VoltageDirect-CurrentTransmission5.Insteadofgroundreturn,ametallicreturnmaybeusedinsituationswheretheearthresistivityistoohighorpossibleinterferencewithunderground/underwatermetallicstructuresisobjectionable.尝试翻译翻译说明在地电阻率太大或者不能对地下/水下金属结构的可能干扰的场合，可以用金属回路取代地回路。词组interferewith意思是“干扰，妨碍…”，在这里其名词形式interferencewith表示“对…的干扰”。词组insteadof表示“代替”。objectionable意思是“引起反对的，要不得的”。生词resistivityn.电阻率5.Insteadofgroundreturn,ametallicreturnmaybeusedinsituationswheretheearthresistivity