由悬浮放电引发的绝缘放电缺陷带电检测及局放源定位分析

Analysis of Live Detection of Insulation Discharges Caused by Suspension Discharge and PD Source Location

针对1起由穿心电流互感器等电位屏蔽悬浮放电引发的绝缘放电缺陷进行了局放图谱定性分析和局放源精确定位。在此基础上,经设备停电检查,确认该柜内穿心电流互感器等电位屏蔽为金属铜带,粘于穿心电流互感器内表面,等电位屏蔽与电流互感器内表面间存在气隙,属设计缺陷。该缺陷导致穿心电流互感器运行中产生局部放电,给设备的安全稳定运行带来了隐患。

In this paper,the qualitative analysis of PD pattern and accurate localization of PD source were carried out for an insulating discharge defect caused by isopotential shielded suspension discharge of current transformer.On this basis,through the power failure inspection of equipment,it was confirmed that the current transformer equipotential shielding was made of metal copper tape and adhered to the inner surface of current transformer.There was air gap between the equipotential shielding and the current transformer inner surface,which was a design defect.This defect led to partial discharge during the operation of through-the-cabinet current transformer,which brought hidden trouble to the safe and stable operation of the equipment.