变压器-毕业外文翻译

《变压器-毕业外文翻译》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、外文翻译TransformerATransformerisadevicethatchangeacelectricenergyatonevoltagelevelintoacelectricenergyatanothervoltagelevelthroughtheactionofamagneticfiled.Itconsistsoftwoormorecoilsofwirewrappedacommonferromagneticcore.Thesecoilsare(usually)notdirectlyconnected.Theonlyconnectionbetweent

2、hecoilsisthecommonmagneticfluxpresentwithinthecore.Oneofthetransformerwindingsisconnectedtoasourceofacelectricpower,andthesecond(andperhapsthird)transformerwindingsupplieselectricpowertoloads.Thetransformerwindingconnectedtothepowersourceiscalledtheprimarywindingorinputwinding,andthew

3、indingconnectedtotheloadsiscalledthesecondarywindingoroutputwinding.Ifthereisathirdwindingonthetransformer,itiscalledthetertiarywinding.Powertransformersareconstructedononeoftwotypesofcores.Onetypeofconstructionconsistsofasimplerectangularlaminatedpieceofsteelwiththetransformerwinding

4、swrappedaroundtwosidesoftherectangle.Thistypeofconstructionisknownascoreform.Theothertypeconsistsofathree-leggedlaminatedcorewiththewindingswrappedaroundthecenterleg.Thistypeofconstructionisknownasshellform.Ineithercase,the7外文翻译coreisconstructedofthinlaminationselectricallyisolatedfro

5、meachotherinordertoreduceeddycurrentstoaminimum.Powertransformersaregivenavarietyofdifferentnames,dependingontheiruseinpowersystems.Atransformerconnectedtotheoutputofageneratorandusedtostepitsvoltageuptotransmissionlevelsissometimescalledaunittransformer.Thetransformerattheotherendoft

6、hetransmissionline,whichstepsthevoltagedownfromtransmissionlevelstodistributionlevels,iscalledasubstationtransformer.Finally,thetransformerthattakesthedistributionvoltageandstepsitdowntothefinalvoltageatwhichthepowerisactuallyusediscalledadistributiontransformer.Allthesedevicesareesse

7、ntiallythesametheonlydifferenceamongthemistheirintendeduse.Inadditiontothevariouspowertransformers,twospecial-purposetransformersareusedwithelectricmachineryandpowersystems.Thefirstofthesespecialtransformersisadevicespeciallydesignedtosampleahighvoltageandproducealowsecondaryvoltagedi

8、rectl