220kV电缆终端击穿故障分析

Analysie of Terminal Breakdown Accident for 220kV Cable

针对一起220k V电缆终端击穿故障,结合解剖检查,笔者分析认为,故障原因为应力锥安装工艺质量不佳,造成应力锥与电缆接触面位置存在局部放电,持续作用下造成电缆绝缘和应力锥绝缘老化且绝缘强度下降,最终导致电缆击穿,由此提出相应的防范措施。

This paper analysed a terminal breakdown accident of a220kV cable.Based on the strpped and checkedterminal,the reason of cable breakdown was caused by the poor quality of installation technology which result of partial discharge between stress cone and the interface of power cable.The insulation strength of power cable and stresscone was reduced by the continued partial discharge with the aging of parts.Preventive measures were proposed.