一种直流系统接地故障检测的新方法

A new method of detecting earthing fault in DC system

分析了现有的检测直流系统接地故障方法存在的死区 ,建议用一种新方法—综合判据 ,即通过检测正负母线电压、检测正负极绝缘电阻、检测支路漏电流来监视及查找直流系统接地故障。这种方法检测直流系统的接地故障 ,灵敏度高 ,用液晶屏在线中文显示 。

After analyzing the dead zone by usinge of existing method to detect earthing fault in DC system,this paper presents a new method-synthetic criterion,which monitors and finds out such earthing fauit in DC system by detecting the voltage of positive and negative buses,positive and negative pole insulation resistance,and the leaking current sub-circuit. The method is a high sensitivity and on-line chinese Character display by means of LCD,thus the insulation condition of DC system can be in time.