电缆局部放电带电检测技术在东北电网的应用分析

Analysis of Cable Partial Discharge On-Line Hydrophobicity Detectionin Application Case in Northeast Grid

首次利用局部放电检测设备检测东北地区在运高压电缆线路内部缺陷并进行解剖验证。在66 kV华裕右线电缆的局部放电检测中发现2号接头存在局部放电,定位信号来自A相接头。根据测试结果,对2号A相接头进行更换,对接头进行解剖,发现接头内部存在明显放电痕迹。此案例证明,局部放电检测设备能够检测运行电缆中存在的放电缺陷,是一种有效的检出手段。

This paper introduces the case of first using partial discharge detection equipment in the northeast region to find defects inside the high-voltage cable line in operation and to be anatomically verified.In the partial discharge test of the 66 kV Huayu right-line cable,it is found that there is partial discharge in the No.2 joint.The positioning signal comes from the A-phase joint.According to the test results,the No.2 A phase joint is replaced and the replaced joint is dissected,it is found that there is obvious discharge trace inside the joint.This case demonstrates that PD detection is an effective way to detect defects which already occurred in the running cable.