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时间:2020-03-28
《特高压交流系统合闸过电压特点研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第39卷第14期电力系统保护与控制Vbl-39NO.142011年7月16日PowerSystemProtectionandControlJuly16,2011特高压交流系统合闸过电压特点研究计荣荣,周浩,易强,苏菲,孙可,陈稼苗(1.浙江大学电气工程学院,浙江杭州310027;2.湖州市电力局,浙江湖州313000;3.浙江省电力公司,浙江杭州310007;4.浙江省电力设计院,浙江杭州310012)摘要:由于特高压交流系统采用高阻抗电源、长距离线路和大功率输电的方式,其合闸过电压出现了一些与其他电压等级合闸过电压不同的特性,在系统研究特高压合闸过电压的基
2、础上,对这些新特点进行了深入研究。研究表明,单回线路的合空线过电压一般高于单相重合闸过电压,但在长距离、大功率输电时,后者可能更为严重,应引起重视;在电源容量较小时,双回线路一回运行情况下另一回线路进行合空线操作时,其过电压往往较高,应重点限制;双回线路的单相重合闸过电压与小电抗的取值密切相关,故小电抗取值应在各种运行方式下进行综合选择。此外,特高压交流系统通常应采用合闸电阻限制合闸过电压,且较长线路宜采用较低阻值,较短线路宜采用较高阻值。关键词:特高压交流;合闸过电压;双回线路;运行方式;小电抗;合闸电阻Studyoncharacteristicofswi
3、tchingsurgeduetoclosinglinesinUHVACsystemJIRong.rong,一,ZHOUHao,YIQiang,SUFei,SUNKe,CHENJia-miao(1.CollegeofElectricalEngineering,Zh~iangUniversity,Hangzhou310027,China;2.HuzhouElectricityBureau,Huzhou313000,China;3.Zh~iangElectricPowerCorporation,Hangzhou310007,China;4.Zh~iangElect
4、ricPowerDesignInstitute,Hangzhou310012,China)Abstract:Becauseoftheapplicationofhigh—impedancepowersupply,long—distancetransmissionlinesandlarge—capacitypowertransmissioninUHVACsystem,theclosingovervoltageofUHVhasitsownfeaturescomparedwiththatinothervoltagegrade.Inthispaper,basedont
5、hesystematicalstudyoftheUHVovervoltage,theresearchonthosenewfeaturesisdonefurtherly.TheresultsshowthatswitchingsurgeduetOclosingnoloadlinesisgenerallyhigherthansingle—phasereclosingovervoltageinsingle—circuitlines.Butwhenitcomestolongdistanceandlarge—capacitytransmission,thelatterm
6、aybemoreserious,SOitshouldbepaidmoreattention.Whenthepowersupplycapacityissmallerandonecircuitisstillinrunningindouble-circuitlines,theovervoltageofclosinganothernoloadlinestendstobehigh,itoughttobealsofocusedtorestrict.Fortheamplitudeofthesingle-phasereclosingovervoltageindouble—c
7、ircuitlinesiscloselyrelatedwiththevalueofsmallreactor,theselectionofsmallreactancemustconsiderallkindsofoperationmodes.Inaddition,asforUHVACpowersystem,generallyclosingresistorsisconfiguredtolimitovervoltage,anditisbe~ertoadoptclosingresistorswithlowresistancevaluesforlongertransmi
8、ssionlinesandthatwithhighr
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