摘要
110kV母差保护误动作跳闸后,排查了相关电流互感器饱和、损坏、极性接线错误、二次回路短路及母差保护装置本身故障等原因,采用带负荷进行回路测试分析,发现2#主变电流互感器二次负载异常,进一步检查出中性线在母差保护屏电流端子排处断路,二次侧没有了零序回路,使区外故障造成了误动作跳闸。中性线断路隐蔽性极强、潜在危害性极大,对此提出了加强二次回路的细致检查、生产厂家研发检测技术等措施,以防范类似事故的发生。
After one 110 kV bus difference protection tripped breakers incorrectly,the issues, such as saturation or broken down of current transformer, improper polarity, short-circuit of secondary loop, fault of bus protection relay were excluded one by one. Then, the abnormal secondary loop load of the current transformer of 2# power transformer was found by load test of the loop. Broken of the neutral line at terminal board in bus protection panel was found at last. The incorrect trip due to short circuit beyond protection bound was arisen from shortage of zero sequence loop. Broken of neutral line is easy to conceal itself. It has great potential harm. This paper proposes to strengthen inspection on secondary loop for maintenance people and R＆D of watchdog device for manufacturer. So that this kind of incident will be avoided.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第7期129-131,共3页
Power System Protection and Control
关键词
母线
差动保护
中性线
断线
跳闸
bus
difference protection
neutral line
break line
trip
