一起干式高压电流互感器爆炸事故原因分析

为了提高干式高压电流互感器在电网中运行的稳定、安全性,笔者检查分析了某110kV变电所一起干式高压电流互感器爆炸事故,判明事故原因为设备末屏线不合理的焊接结构以及生产过程中末屏铜编织线机械损伤造成的末屏接地不良。提出了干式高压电流互感器箱体设计需具有防爆功能,改进末屏线焊接结构为压接结构等反措措施,对干式高压电流互感器安全稳定运行具有重要意义。

Explosion Accident Analysis of Dry-type High Voltage Current Transformer

This paper analyzes an explosion accident of a dry-type high voltage current transformer in Hengyu 110 kV substation,and find the accident is due to improper welded structure of the end shield and mechanical damage of the braiding copper wire,which causes the end shield imperfectly earthing.Some countermeasures against the explosion accident are suggested,including that the current transformer cabinet should have explosion-proof function in design,and the welded structure of the end shield wire should be improved,etc.