EST unit 2.ppt

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1、ElectricPowerSystemUnit2TextPara.1Electricpowersystem,componentsthattransformothertypesofenergyintoelectricalenergyandtransmitthisenergytoaconsumer.电力系统就是把其他能量转化成电能并传送到用户的由各种组成部分所组成的系统。“componentsthattransform...”是对Electricpowersystem的解释说明，此结构常见于科技文章开头，相当于表达定义的一种形式。1.component分量；元件；部分，成分，组件alter

2、natingcomponentcellcomponentcircuitcomponentcondensercomponent交变部分细胞成分电路元件容抗Para.2Amodernelectricpowersystemconsistsofsixmaincomponents:1.thepowerstation发电站2.transformerstoraise...升压变压器3.transmissionlines输电线路4.substations变电所5.distributionlines配电线路6.transformersthatlower...降压变压器Para.2voltagevolt(

3、V)kilovolt(Kv)...thesubstationatwhichthepowerissteppeddowntothevoltageonthedistributionlines...逐渐降低配电线路电压的变电站stepdown↔stepupstepdownthepowerstepdownthevoltage2.substation变电所auxiliarysubstationdistributingsubstationhousesubstationprimarysubstation辅助变电所配电变电站厂用/专用变电所一次变电所2.transmitv.n.transmission（

4、电气工程学）输送（无线电专业）发射，、播送（机械学）传动、变速（物理学）透射（医学）遗传Parentstransmitsomeoftheircharacteristicstotheirchildren.primemover原动机turbine:arotaryenginethatextractsenergyfromafluidorairflowandconvertitintousefulwork.steamturbines汽轮机gasturbines燃气轮机waterturbines水轮机windturbines风轮机gasturbinecontrolsystem燃气轮机控制系统Para

5、.3combustion1.theprocessofburning燃烧2.achemicalprocessinwhichsubstancescombinewiththeoxygenintheairtoproduceheatandlight燃烧过程combustionchamber燃烧室spontaneouscombustion自燃internal-combustionengine内燃机external-combustionengine外燃机(如蒸汽机等)Para.3gasturbinecombustionchamberpercentage百分率，百分比percentageofaccur

6、acypercentageofdamagepercentageofmoistureAlargepercentageofthecrophasspoiled.准确度百分数损失百分率含水率大部分庄稼被毁。Para.3Para.4Transformerstepthisvoltageuptovaluesrangingfrom138,000to765,000Vforthelong-distanceprimarytransmissionlinebecausehighervoltagescanbetransmittedmoreefficientlyoverlongdistances.在远距离的电力传输

7、中，电压越高，其传输的效率也越高，因此，使用变压器可以把第一级传输线电压增大到138千伏至765千伏。Para.5Thelinesofhigh-voltagetransmissionsystemsareusuallycomposedofwiresofcopper,aluminum,orcopper-cladoraluminum-cladsteel,whicharesuspendedfromtalllatticeworkoftowersofste