欢迎来到天天文库
浏览记录
ID:28241729
大小:65.54 KB
页数:4页
时间:2018-12-09
《电力专业英语翻译(第二版)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Adecreaseinthefieldcurrentgivesrisetolagging(inductive)currentinthestator;andincreaseinthefieldcurrentthatoverexcitesthemotorcausesaleading(capacitive)currenttoappearinthestator.励磁电流减小时,定子电流感性增强;励磁电流增加使电机过励时将在定子中产生容性电流。AninductionmachineisanACtwo-windingunitinwhichonlyone(primary,usuallythestator
2、)windingissuppliedwithanalternatingcurrentataconstantfrequency1fromanexternalsource.感应电机是一种具有双绕组的交流电气设备,它只有一个绕组(一次侧,通常是定子)通过外电源输入固定频率为1的交变电流。Currenttransformersforprotectionareessentiallysimilartothoseusedfortheoperationofammeters,watthourmetersandotherinstruments.保护用电流互感器基本上同操作用的电流表、电能表和其他仪器类似。D
3、Gplanningalsoinvolvesarrangingforconnectionoftherenewablepowergeneratorwiththelocalgrid,andforsupportofanylocalelectricloadwhentherenewablesourceisnotavailable.分布式发电规划还包括安排可再生能源发电机与地方电网相连接,这样当可再生能源不可用时,本地电力负荷仍能得到支持。Distributedgenerationcanincluderenewablepowergenerationresourcessuchaswind,solar,o
4、rlow-headhydropowerproduction.分布式发电可以包括可再生发电资源,例如风能、太阳能或低水头水力发电。Distributedgeneration,orDG,includestheapplicationofsmallgenerators,typicallyrangingincapacityfrom15kWto10000kW,scatteredthroughoutapowersystem,toprovidetheelectricpowerneededbyelectricalconsumers.分布式发电包括小型发电机组的应用,容量通常从15kW到10000kW不等,
5、这些机组散布在整个电力系统中,为用户提供所需的电能。Eachsinglethyristorvalveconsistsofacertainamountofseriesconnectedthyristorswiththeirauxiliarycircuits.晶闸管阀由一定数量的串联晶闸管及其附属电路组成。Eachsinglevalveintheconverterbridgeisbuiltupwithacertainnumberofseries-connectedIGBTstogetherwiththeirauxiliaryelectronics.换流器桥阀由一定数量的串联IGBT(绝缘栅门
6、极晶体管)及其附属电路构成。Electricpowerisproducedatgeneratingstations(GS)andtransmittedtoconsumersthroughacomplexnetworkofindividualcomponents,includingtransmissionlines,transformers,andswitchingdevices.电能由发电厂发出,然后通过由诸如输电线路、变压器、开关设备这些独立部件组成的复杂网络输送到用户。However,thesingleseriousproblemencounteredwithEHVvoltagele
7、velsistheovervoltagesduringswitchingoperations,commonlycalledswitching-surgeovervoltages.然而,超高压电压等级面临的一个严重问题是进行开关操作时产生的过电压,通常称为操作冲击过电压。Intheconversionprocesstheconverterconsumesreactivepowerwhichiscompensatedinpartbyth
此文档下载收益归作者所有