摘要
发电机中性点不同接地方式当主变压器高压侧出现单相接地时,经变压器高低压绕组耦合传递至发电机机端基波零序电压值,经计算其值相差很大,理论分析计算和运行实践证明,汽轮发电机中性点经消弧线圈欠补偿接地方式的发电机基波零序过电压保护不宜动作于跳闸方式,如必须由信号改为跳闸方式,宜将消弧线圈欠补偿接地改为专用配电变压器高阻接地。
This paper has found that the zero sequence voltage conveyed from the primary and secondary side of the transformer to generator terminal is so different when a single-phase-to-earth occurs on the primary side of the transformer for a non-neutral-grounding generator. Based on the results of theoretical calculation and confirmation from the field operation, with the arc-suppression-soil-earth system, the generator＇ s first harmonic zero sequence over voltage protection will be not good for trip, if it must, then should be changed to trip from single, the grounding of arc-suppression reactor under compensation should be changed to the distribution transformer with high-impedance grounding.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第20期88-92,共5页
Automation of Electric Power Systems
关键词
定子单相接地保护
发电机中性点
消弧线圈接地
高阻接地
电场耦合
零序电压
stator single phase ground fault protection
generator neutral
arc-suppression-coil earth
high-impedance ground
electric field linkage
zero sequence voltage
