大型水电站机组定子一点接地保护动作故障分析

Fault Finding and Analysis of Stator Ground Protection Action of Large Hydropower Station Coping Measures

发电机定子一点接地故障是发电机常见故障之一,但由于发电机直连一次设备与发电机定子电气参数相似,目前常规定子接地保护装置无法准确定位故障点给事故排查造成困扰。本文针对某大型水电站一起发电机定子一点接地保护动作跳闸事故,结合发电机定子一点接地保护配置,辅助以故障录波图分析,可以达到迅速定位故障点的目的,为事故应急处置提供依据,大大缩短了机组故障停运的时间,具备一定的行业参考意义。

One point grounding fault of generator stator is one of the common faults of generator.However,because the electrical parameters of generator stator are similar to those of generator stator,the current conventional stator grounding protection device can not accurately locate the fault point,which causes trouble for accident investigation.This paper aims at a large hydropower station generator stator one point grounding protection action trip accident,combined with the generator stator one point grounding protection configuration,assisted by fault recording diagram analysis,can achieve the purpose of rapid fault location,provide a basis for the emergency treatment of the accident,greatly shorten the time of unit fault outage,has a certain industry reference significance.