基于抗分布电容法直流接地故障查找与分析

Searching and Analysis of DC Grounding Fault with Anti-distributed Capacitance Method

分布电容给直流接地查找带来很多不利影响,造成误报或检测灵敏度不够等,严重时还可能在接地查找过程中导致保护误动。从直流系统架构、故障类型及接地查找原理切入,分析了分布电容对直流接地查找的影响,并从相位比较和特征频率的角度,探讨区分大分布电容支路以实现抗分布电容接地查找的方法。

Distributed capacitance has an adverse effect on the DC ground fault search,resulting in false alarms or insufficient detection sensitivity.It may also cause protection malfunctions during the grounding fault search.This paper analyzes the impact of distributed capacitance on DC grounding fault search from the perspective of DC system architecture,fault type and grounding fault search principle,and distinguishes large distributed capacitance branches from the perspective of phase comparison and characteristic frequency to achieve anti-distributed capacitance during grounding fault search.