基于内置差分电容的电缆接头局放检测技术研究  

Cable Joint Partial Discharge Detection Based on Built-in Differential Capacitance

作　　者：徐明忠 夏荣 欧阳本红 贾晓刚 陈杰 刘洋 臧磊 朱祖华 XU Mingzhong;XIA Rong;OUYANG Benhong;JIA Xiaogang;CHEN Jie;LIU Yang;ZANG Lei;ZHU Zuhua(China Electric Power Research Institute,Wuhan 430074,China;Zhejiang Tuwei Technology Co.Ltd.,Hangzhou 310027,China;State Grid Jiangsu Electric Power Company Ltd.,Nanjing 211106,China)

机构地区：[1]中国电力科学研究院有限公司,湖北武汉430074 [2]浙江图维科技股份有限公司,浙江杭州310027 [3]国网江苏省电力有限公司,江苏南京211106

出　　处：《智慧电力》2022年第7期37-44,共8页Smart Power

基　　金：国家重点研发计划资助项目(2017YFB0902705)。

摘　　要：实时准确测量电缆局部放电对电缆运行状态的评估意义重大,目前电缆局部放电主要运用高频互感技术,通过高频电流传感器检测电缆局部放电,但极易受环境噪声干扰,无法准确判断电缆局部放电。本文介绍一种基于差分电容的内置差分容式局放检测技术,该技术可以精确测量电缆局部放电。根据GB/T 7354-2003、IEC 60270:2000标准,通过模拟电缆典型缺陷,对基于差分电容的电缆接头局放检测技术的有效性进行试验验证,试验证明了本技术与实验室局部放电系统的放电相位及响应趋势完全一致,验证了该技术的可靠性和有效性。并将该技术应用于工程实践,极大地提高了电缆局放检测水平。The real-time and accurate measurement of cable partial discharge is of great significance to the evaluation of cable operating state.At present,high frequency mutual inductance technology is mainly used to detect cable partial discharge through high frequency current sensor,but it is easy to be disturbed by environmental noise,unable to accurately judge cable partial discharge.A built-in partial discharge detection technique is introduced based on differential capacitance,which can accurately measure partial discharge of cable.According to GB/T 7354-2003&IEC 60270:2000 standard,the effectiveness of built-in partial discharge detection technique based on differential capacitance is verified by simulating cable typical defects.The experimental results show that this technique is completely consistent with the discharge phase and response trend of the laboratory partial discharge system.The reliability and effectiveness of the technique are verified.The application of the proposed technology in engineering practice has greatly improved the level of cable PD detection.

关 键 词：局部放电 在线检测 差分电容 内置局放 

分 类 号：TM932[电气工程—电力电子与电力传动]