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简介：Toanalyzetheinfluenceof±400kVQinghai-TibetHVDCtransmissionsystemontransmissionlineprotectionsinQinghaiACpowersystem,aclosed-loopsimulationsystemwasconstructedbycombingHyperSimsystemwithHVDCcontrolprotectiondevices.Variousfaultsondouble-circuit750kVandmulticircuit330kVACtransmissionlinesinQinghaipowersystemweresimulated.TheimpedancecharacteristicsandharmoniccomponentsatQinghaisideofQing-TibetDCtransmissionlinewereanalyzed.TheharmonicproportioninvoltagesandcurrentswerestudiedforfaultsthattookplaceatdifferentlocationsneartheDCsystem.TheinflenceofQing-TibetDCsystemonthedirectionalcomponentsofprotections,differentialprotectionsanddistanceprotectionsofACtransmissionlineswasdiscussedanddrewtheconclusionsthattheDCsytemhadlittleinfluenceondifferentialprotections,whilehadgreatinflenceondirectionalcomponentsanddistanceprotection.TheconclusionscanprovidereferenceforstudyingtheinteractionbetweenACandDCsystems.

简介：1.GeneralreviewThefirst330kVtransmissionlineinNorthwestChinafromLiujiaxiaHydroPowerStationthroughQinanSubstationtoTangyuSubstationwascommissionedin1972.Intheseventies,accompany-ingthecommissioningofHanchengandQinlingThermalPowerPlantsinShaanxiProvince,the330kVtransmissionlinesfrom

简介：ＢｅｎｅｆｉｔｓｏｆＳｅｒｉｅｓＣｏｍｐｅｎｓａｔｉｏｎｉｎＬｏｎｇＴｒａｎｓｍｉｓｓｉｏｎＳｙｓｔｅｍＸ．Ｚ．Ｌｅｉ，Ｄ．ＰｏｖｈＳＩＭＥＮＳＡＧ，ＰｏｗｅｒｔｒａｎｓｍｉｓｓｉｏｎａｎｄＤｉｓｔｒｉｂｕｔｉｏｎＧｅｒｍａｎｙ，Ｄ９１０５０．Ｐ．Ｏ...

简介：ＰｒｏｓｐｅｃｔｏｆＦｕｔｕｒｅＴｒａｎｓｍｉｓｓｉｏｎａｎｄＤｉｓｔｒｉｂｕｔｉｏｎＤｅｖｅｌｏｐｍｅｎｔｉｎＣｈｉｎａＳｈｅｎＧｅｎｃａｉＭｉｎｉｓｔｒｙｏｆＥｌｅｃｔｒｉｃＰｏｗｅｒ１．ＰｒｅｓｅｎｔＳｌａｔｅＤｕｒｉｎｇｔｈｅｒｅｃｅｎｔ１８...

简介：OnDecember15,2010,SGCCboughtinsevenBraziliancharteredtransmissioncompaniessuccessfully.TheassetsboughtinfromfourSpanishcompaniesthistimeinclude16500-kVtransmissionlineswithatotallengthof3173km,andseveralsubstationsandswitchingstations,whicharemainlysituatedinthemosteconomy-developedcentral-southregionsandinthekeylocationsofnorth-southcorridorofBrazilianpowergrid,providingpowerforthecountry'sthreemostimportantcities-Brasilia,RiodeJaneiroandSaoPaulo.

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简介：Afewdaysago,thetransmissionschemeforLongtanHydropowerStationhasbeendefinite.ThestationwillbeconnectedwiththeSouthernInterconnectedPowerNetworkthroughfivecircuitsof500kVoutgoinglines.TheyincludeonecircuittoHechi,twocircuitstoLiuzhouandtwocircuitstoPingguo.Aft

简介：I.IntroductionA31.2km110kVtransmissionlineisdesignedtooperateunder35kVwithconductormodelAC-185(aluminiumstrand--28x2.87mm~2,steelcore--7x2.50mm~2)ataverageoper-atingstressof24.2%,andoverheadgroundwiremodelC-50(steelstrand--7x2.97mm~2)ataverageoperatingstressof20.6%.Thewholelinehas130pole-towers,mostofwhichareofprestressedconcretedouble-polestructure,asshowninFig.1.The

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简介：Basedontheexperienceofenvironmentalacceptancetestsforpowertransmissionprojects,theproblemsfoundinacceptancetestsandthesystemshortcomingsofacceptancetestitselfareanalyzed.Recommendationsareprovidedtoimprovethefuturework.

简介：As"congestioncosts"ofcoaltransportationarefairlyhigh,asoundcomparisonofeconomicefficiencybetweencoaltransportationandpowertransmissionshouldtake"congestioncosts"ofcoaltransportationintoaccount.Otherwise,itcannottrulyreflectpowertransmission’sefficiencyadvantage.Inadditiontoraisingrailwaycapacity,theChinesegovernmentshouldalsoincreasepowertransmissiontorelievethetransportationpressureonrailwaytocutdown"congestioncosts."

简介：±５００ＫＶＨＶＤＣＴｒａｎｓｍｉｓｓｉｏｎｐｒｏｊｅｃｔｆｒｏｍＴｉａｎｓｈｅｎｇｑｉａｏｔｏＧｕａｎｇｚｈｏｕＬｉＬｉｃｈｅｎｇ，ＰｅｎｇＢａｏｓｈｕ，ＹｕＪｉａｎｇｕｏ，ＷｕＺｅｈｕｉＰｏｗｅｒＮｅｔｗｏｒｋ，ＣｏｎｓｔｒｕｃｔｉｏｎＤｅｐａｒ...

简介：OnJanuary10,2011,the750-kVTurpan-Bayinguolengtransmission-substationprojectofXinjiangpowergrid,officiallywentintooperation.Henceforth,thehardtimeofstaggeringpowerutilizationandlimitingpowerutilizationinpeakperiodinBazhou,Aksu,Kashi,KezhouandHotanfiveprefecturesinsouthXingjiangwillneverreturn.

简介：1.IntroductionConductorgallopinghascausedmoreandmoredisturbancestothesecureoperationofpowersystemfrom1930untilnow.Al-thoughmanyauthorshavebeenstudyingitstheoryandpreventivemeasuresbywind-tunnelandfieldmodellingtestsandgettingsome

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简介：HoldingthegreatestpowertransmissioncapacityinChina,ThreeGorgespowertransmissionandsubstation(T&S)projectisanimportantlandmarkinthehistory

简介：AccordingtothepowersystemplanninginChina,500kVtransmissionlinewillbethetrunksinallregionalnetworksexcepttheNorthwestChinaSystem.Duetoshortofcapitalresources,however,mostofthose500kVtransmissionlinesareandwillbeoperatinginsinglecircuitforquitealongpe-riodoftime.So,tousetheliveworkingtechniqueson500kVlinesisanimportantproblemforstudy.Actually,wehadalreadybegunourstudyonliveworkingon500kVtransmissionlineseveralyearspriortothePing-Wu

简介：<正>InOctoberofthisyear,adesignevaluationmeetingonfeasibilitystudyofUHVDCtransmissionprojectwaspresidedoverbytheStateGridCorporation.Itindicatesthatthecorporationmadeagreatprogressinthepre-engineeringworkofUHVDCtransmission.TheUHVDCtransmissionprojects,whichsendelectricityfromJinshaRiverPhaseI(XiluoduandXiangjiabahydropowerstations)totheCentralandEasternChinaandfromJinping