320kV国产交联聚乙烯绝缘料高压直流电缆设计  

Design of the 320 kV Domestic Insulating Material XLPE DC Cable

作　　者：周朝阳 高寒 ZHOU Zhao-yang;GAO Han(State Grid Tianjin Electric Power Company, Tianjin 300250, China)

机构地区：[1]国网天津市电力公司,天津300250

出　　处：《电线电缆》2018年第2期9-13,17,共6页Wire & Cable

摘　　要：为促进国产交联聚乙烯绝缘料在高压直流电缆绝缘中的应用,根据实验数据推导出国产交联聚乙烯绝缘料的电导率方程,得到了电导率与温度和电场之间的关系;实验测得五种不同厚度薄试样的击穿场强,根据双参数威布尔分布推导出绝缘料的击穿场强与厚度的关系,得出厚度为26 mm下绝缘材料的击穿场强;根据TICW 7.2标准设计出320 kV高压直流电缆的结构,利用Comsol Multiphysics软件仿真得出电缆在不同负荷状态下的电场和温度场分布。仿真结果表明:当导体绝缘内温差大于5.3℃时,绝缘外部场强开始高于内部场强;当导体温度为70℃时,绝缘内部电场最大值为15.1 kV/mm,远低于材料的击穿场强。通过仿真分析,为成功设计320 kV高压直流电缆提供参考。To promote the application of domestically produced crosslinked polyethylene material in HVDC cable in-sulation,this paper has measured the conductivity property of domestic crosslinked polyethylene based on experimen-tal data,obtaining the relation among electrical conductivity and temperature and electric field.It has measured the breakdown strength of five samples of thin thickness.Based on test,it has derived the relation between breakdown strength and thickness by two-parameter Weibull distribution,and it has calculated the breakdown strength when insu-lation thickness is26mm.Then it has designed the structure of320kV HVDC cable according to TICW7.2.It has simulated the distribution of both electric field and temperature in cable under different loads through Comsol Mul-tiphysics.It has concluded that the cable begins to appear polarity reversal when the range of temperature in insula-tion is higher than5.3t.When the wire core is70,the maximum value of the electric field inside the insulationis15.1kV/mm which is far less than the breakdown strength of the material.Through analysis,it has provided the reference for the successful design of320kV HVDC cable.

关 键 词：高压直流电缆 交联聚乙晞 电导率 电场 

分 类 号：TM247.1[一般工业技术—材料科学与工程]