一种基于石墨注入的高压电缆缓冲层修复方法研究  

Research on a repair method of high-voltage cable buffer layer based ongraphite injection

作　　者：宋鹏先[1] 张华 朱晓辉[1] 房晟辰 魏占朋 杜伯学 李奇 刘浩 SONG Pengxian;ZHANG Hua;ZHU Xiaohui;FANG Shengchen;WEI Zhanpeng;DU Boxue;LI Qi;LIU Hao(Tianjin Electric Power Research Institute of State Grid Tianjin Electric Power Company,Tianjin 300384,China;State Grid Tianjin Cable Company,Tianjin 300171,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]国网天津市电力公司电力科学研究院,天津300384 [2]国网天津市电缆公司,天津300171 [3]天津大学电气自动化与信息工程学院,天津300072

出　　处：《绝缘材料》2023年第10期84-90,共7页Insulating Materials

基　　金：国网天津市电力公司科技项目(KJ21-1-8)。

摘　　要：近年来,高压电缆缓冲层烧蚀故障频发,为解决这一问题,本研究建立XLPE电缆仿真模型,研究不同电阻率下缓冲层的电场分布特性;基于故障机理提出了缓冲层修复方案与全套现场修复工艺,分别对长度为1.2 m和6 m的220kV高压交联聚乙烯故障电缆进行修复试验,并从接触电阻与电容电流两个角度对修复效果进行评价。结果表明:随着缓冲层体积电阻率的升高,缓冲层与铝护套之间电场畸变严重,极易引发局部放电,从而引起电缆故障;而随着缓冲层体积电阻率的下降,缓冲层与铝护套间的电气连接逐渐恢复,电场分布趋于均匀。注入导电修复介质后,缓冲层与铝护套之间的电阻下降幅度可达41.67%,表明缓冲层与铝护套电气连接性能得到恢复。In recent years,ablation failure of high-voltage cable buffer layer occurs frequently.In order to solve the problem,this paper established a simulation model for XLPE cables and studied the electric field distribution characteristics of buffer layers under different resistivity.Based on the fault mechanism,a buffer layer repair scheme and a full set of on-site repair process were proposed.Repair tests were conducted on 220 kV high-voltage cross-linked polyethylene fault cables with a length of 1.2 m and 6 m,respectively.The repair effect was evaluated from the perspectives of contact resistance and capacitance current.The results show that with the increase of volume resistivity of the buffer layer,the electric field distortion between the buffer layer and the aluminum sheath is serious,which is easy to cause partial discharge and lead to cable failure.With the decrease of volume resistivity of the buffer layer,the electrical connection between the buffer layer and the aluminum sheath gradually recovers,and the electric field distribution tends to be uniform.After the injection of conductive repair medium,the resistance between the buffer layer and the aluminum sheath decreases by 41.67%,indicating that the electrical connection performance between the buffer layer and the aluminum sheath has been restored.

关 键 词：缓冲层 电场畸变 导电修复介质 效果评价 

分 类 号：TM247[一般工业技术—材料科学与工程]