高压开关柜异常局放故障电场数值计算与分析

Numerical Calculation and Analysis of Abnormal Partial Discharge Electric Field in High Voltage Switchgear

2015年以来,广西电网公司某站发生两起开关短路故障,针对该型故障的开关柜,全网进行了局放普测,结果发现个别同类型开关柜存在局放情况。就开关柜局放测试情况进行深入分析,另针对在运开关柜设备上安装无线测温装置的情况,使用COMSOL模拟软件对进线开关柜母线导体上安装无线测温装置后的电场分布进行了仿真分析,仿真结果表明,安装无线测温装置后,电场分布发生畸变,最大电场幅值增加了97.2%。

Since 2015, two switch short-circuit faults have occurred in a station in Guangxi power grid. In view of the switch cabinet of this type of switchgear, the whole network has been put into general survey, and the local release test of individual type switchgear is found. A thorough analysis is made on the test situation of the switch cabinet. Also aiming at the installation of the switchgear cabinet, a wireless temperature measuring device is installed, and the COMSOL simulation software is used to simulate the distribution of the electric field after installing the wireless temperature measuring device on the busbar conductor of the line switch cabinet. The simulation results show that the distribution of the electric field is distorted and the maximum electric field amplitude is increased by 97.2% after the installation of the wireless temperature measuring device.