摘要
近几年华东地区220kV及以下电压等级的变电站和电厂发生了多起与雷击相关的开关闪络和爆炸事件,2007年7月发生了一起某220kV线路遭雷击造成一侧变电所开关闪络和另一侧变电所CT击穿的故障。笔者结合实际运行情况,利用电磁暂态程序EMTP对此故障进行了雷电侵入波过电压模拟计算,根据计算结果对故障发生原因进行了分析和研究,提出了在220kV线路进线保护段末端装设避雷器来限制雷电侵入波过电压的防范措施。
Flashovers or even explosions of switchgears fixed on substations and power plant at the voltage rank of 220 kV or below, which were caused by lightning intrusive waves, have taken place frequently in east China in recent years. In July 2007, this kind of event occurred because of lightning strike on the 220 kV transmission line, which generated the circuit breaker flashover and current transformer dielectric breakdown. This paper simulates the accident considering the running condition, and obtains the lightning over-voltages by the software EMTP. According to the over-voltage values, the reasons of the accident are analysed, and some protection methods from over-voltage due to lightning intrusive wave are presented by installing MOAs at both ends of the 220 kV transmission lines.
出处
《高压电器》
CAS
CSCD
北大核心
2008年第5期428-431,共4页
High Voltage Apparatus
关键词
开关
闪络
击穿
雷电侵入波
过电压
circuit breaker
flashover
breakdown
lightning intrusive wave
over-voltage
