基于电容耦合高频脉冲电流法的开关柜局部放电在线监测系统研究

Research on On-line Monitoring System for Partial Discharge of Switchgear Based on Capacitive Coupled High Frequency Pulse Current Method

开关柜作为配网系统中的主要设备之一,其安全性及可靠性对于保证电网安稳运行至关重要。局部放电现象是造成开关柜绝缘故障的最主要表现,如何有效监测运行中的开关柜局部放电现象,及时发现潜在的绝缘风险是电力部门关心并亟待解决的问题。本文提出了一套开关柜局部放电在线监测系统,该系统基于电容耦合高频脉冲电流法,可对开关柜局部放电现象进行有效监测,并且通过试验方案对系统可行性进行了验证。

As one of the main equipments in distribution network system,the safety and reliability of switchgear is very important to ensure the safe operation of power grid.Partial discharge is the main cause of insulation failure of switchgear.How to find the partial discharge phenomenon of switchgear in operation effectively and how to monitor and find the potential insulation risk in time is an increasingly concerned and urgent problem to be solved by electric power supervision department.In view of this problem,a set of on-line monitoring system for partial discharge of switchgear is proposed in this paper.Based on capacitive coupling high frequency pulse current method,the partial discharge phenomenon of switchgear can be effectively detected.Finally,the feasibility of the system is verified by the test scheme.