核电厂直流系统接地故障查找与运行风险分析

Look for Grounding Fault and Risk Analysis in Nuclear Power Plant's Direct Current Supply System

直流接地是直流电力系统最常见的故障之一。直流系统负荷涉及面广、接线回路复杂,导致了接地故障的查找和处理十分困难。本文阐述了接地故障发生的原因,针对核电厂的特殊性对常见的查找接地方法进行了适用性分析,并结合作者自己查找故障的经验和历史检修方案,提出了适用于核电厂的故障查找方法。最后分析了故障不能处理的情况下对核电厂潜在的风险,并提出改进措施以供探讨。

Direct current grounding is one of the most common fault happens in DC power supply system.In nuclear power plant,direct current distribute to virous loads by complex conection loops,which makes locating and handing DC fault very difficult.In this paper,the author try to summarize reasons cause DC grounding faults happen in Nuclear plant.Considering nuclear safety,discuss of applicability the common ways to locate the fault.According to the author’s experience in looking for DC fault and overhaul program used before,a useable way to locate DC grounding fault is given.Farther more,when DC grounding fault can not be handled,analyse of nuclear safety risk and a measure to improve the reliability of DC supply system has been mentioned.