Operation Analysis and Optimization of Leakage Drainage System of Hydropower Station
一起发电机注入式定子接地保护动作原因分析及检查处理

摘要

某水电站曾发生发电机组注入式定子接地保护动作导致停机事故，通过检查发现引起事故的原因为机组出口电压互感器A相熔断器熔丝断线，导致发电机出口零序电压异常，最终引起发电机A套注入式定子接地保护动作，本文从保护动作原理、保护动作报告、故障录波等信息着手，分析事故的原因，并进行检查处理，为了避免此类事故再次发生造成经济损失和不安全事件，根据发现的问题，提出预防措施。

Abstract

A hydropower station once had a shutdown accident caused by the injection type stator grounding protection action of the generator unit.Through inspection, it was found that the cause of the accident was that the fuse of phase A fuse of the voltage transformer at the outlet of the unit was broken, which led to the abnormal zero sequence voltage at the outlet of the generator, and finally caused the injection type stator grounding protection action of the generator set A. This paper starts from the protection action principle, protection action report, fault recording and other information, Analyze the cause of the accident and carry out inspection and handling.In order to avoid economic losses and unsafe events caused by such accidents, propose preventive measures according to the problems found.