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1、第40卷第9期:2627-2634高电压技术Vol.40,No.9:2627-26342014年9月30日HighVoltageEngineeringSeptember30,2014DOI:10.13336/j.1003-6520.hve.2014.09.004硅橡胶电导特性对XLPE绝缘高压直流电缆终端电场分布的影响121121韩宝忠,傅明利,李春阳,赵洪,侯帅,李忠华(1.哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080;2.南方电网科学研究院有限责任公司,广州510080
2、)摘要:交联聚乙烯(XLPE)绝缘高压直流电缆终端内各绝缘材料的电导率受温度和电场强度的影响差异较大,这是导致其电场分布复杂、研发难度大的关键因素之一。为此,利用多物理场耦合软件仿真计算了以不同性质硅橡胶为增强绝缘的高压直流电缆终端模型内的电场分布,分析了绝缘材料的电导特性对电场分布的影响与机理。研究结果表明:以高压交流电缆终端中常用的硅橡胶作为直流电缆终端的增强绝缘时,应力锥根部的硅橡胶内电场严重畸变,最大电场强度(简称场强)值约达到电缆本体平均场强的6.7倍;以具有合适非线性电导特性的硅橡胶做
3、增强绝缘时,直流电缆终端内电场分布均匀,且最大场强点位于电缆XLPE绝缘内。说明应用电导非线性硅橡胶是解决XLPE绝缘高压直流电缆终端制造瓶颈问题的有效方法之一。关键词:交联聚乙烯;高压直流电缆;电缆终端;硅橡胶;非线性电导;电场EffectofSiliconeRubberÊsElectricConductanceCharacteristiconElectricFieldDistributionInsideXLPEInsulatedHVDCCableTermination121121HANBaoz
4、hong,FUMingli,LIChunyang,ZHAOHong,HOUShuai,LIZhonghua(1.KeyLaboratoryofEngineeringDielectricsandItsApplicationoftheMinistryofEducation,HarbinUniversityofScienceandTechnology,Harbin150080,China;2.ElectricPowerResearchInstitute,ChinaSouthernPowerGrid,Gu
5、angzhou510080,China)Abstract:Theelectricalconductivityofinsulatingmaterialsinsidecrosslinkedpolyethylene(XLPE)insulatedHVDCcableterminationisstronglyaffectedbytemperatureandelectricfieldstrength,whichisakeyfactorleadingtothecom-plexelectricfielddistri
6、butionanddifficultdevelopmentoftermination.Thus,usingmultiphysicscouplingsimulatingsoftware,wecalculatedtheelectricfielddistributionwithintheterminationofHVDCcable,whichhaddifferentsiliconerubbersasitsreinforcementinsulation,andanalyzedtheinfluentialm
7、echanismoftheinsulatingmaterials’conductivityonthedistribution.Theresultsindicatethatwhenthereinforcementinsulationismadeofcommonsiliconerubber,theelectricfielddistortionatthefootofsiliconerubberstressreliefconeissignificant:themaximumfieldstrengthrea
8、ches6.7timestheaveragefieldstrengthinsidethecable.However,whenthesiliconerubberhavingapropernonlinearlycon-ductivepropertyisdeployedinthereinforcementinsulation,theelectricfieldwithintheterminationstructureismoreuniformlyprofiled,andthemaximum