直流系统接地点探测新原理

A NEW METHOD OF DETECTING GROUNDING POINT IN DC SYSTEM

对现有几种直流系统接地点探测方法进行了比较分析 ,指出它们的优缺点。提出了一种简便、操作安全、灵敏度高的直流系统接地点探测新原理——电流相位比较法。该方法使用两个低频电流钳型探头 ,比较这两个探头测量到的低频电流相位 。

s: After comparing and analyzing several methods of detecting grounding fault point in DC system, this paper pointsout their advantages and shortcomings. Then a simple, secure method with high sensitlvity is proposed that is the method ofcomparing current phase positions. Two low-frequency current probes are used in this method. By comparing the phasepositions of low-frequency currents measured by these two probes. the conclusion may be drawn that the grounding faultpoint is on the circuit with lagging phase angle.