摘要
瑞明电厂2号发电机采用中性点经配电变压器高阻接地方式,1号发电机采用中性点经单相电压互感器接地方式,通过对二者接地方式不同特点的比较及对2号发电机接地保护的分析,提出瑞明电厂2号发电机定子单相接地保护的基波零序电压出口方式应该由信号改为投延时5s跳闸,3次谐波电压比值出口则继续投信号位置的建议。
The neutral point of Unit 2 generator in Ruiming Power Plant is earthed through distribution transformer （high resistance）, while that of Unit 1 through monophase voltage transformer. Based on the comparison of the two neutral-point earthing methods and the analysis of stator ground fault protection of Unit 2, it is suggested that the export way of fundamental-wave zero-sequence voltage of Unit 2 generator stator single-phase earth fault protection should be changed from emitting signal to 5 s delayed tripping, and the third-harmonic voltage ratio export maintain signal position.
出处
《广东电力》
2007年第2期55-57,75,共4页
Guangdong Electric Power
关键词
中性点接地
定子接地保护
基波零序电压
3次谐波电压
neutral-point earthing
stator ground fault protection
fundamental-wave zero-sequence voltage
third-harmonic voltage
