摘要
对某电厂两台机组并网运行时发生保护误动的故障情况进行了分析。事故原因是1号机组在并网时发生了非同期并网,在1号主变压器和1号发电机定子线圈产生了很大的冲击电流和非周期分量电流,在发电机转子回路也感应出很大的电流造成灭磁断路器跳闸,同时在2号机组产生和应涌流造成2号机组差动跳闸。和应涌流由于具有涌流特征,其幅值很大,且其持续时间较长,容易造成保护误动。
The protection misoperation during the grid connected operation of two units in some power plant is analyzed. The reason for the accident was that the asynchronous grid connected operation of Unit 1 caused great impulse current and acylic component current to Main Transformer 1 and the stator winding of Generator 1 ; the considerable induced current in the generator rotor circuit led to the trip of field discharge circuit breaker, and the ensuing sympathetic inrush in Unit 2 gave rise to the differential trip of Unit 2. Having inrush property, great magnitude and long duration, sympathetic inrush may cause protection misoperation easily.
出处
《广东电力》
2009年第6期57-59,66,共4页
Guangdong Electric Power
关键词
变压器
非同期
和应涌流
误动
transformer
asynchronous
sympathetic inrush
misoperation
