基于高频脉冲电流传感器的局部放电实时监测系统设计与应用  

Design and Application of Real-time Monitoring System Based on High-frequency Pulse Current Sensor

作　　者：杨海鹏 许国澎 Yang Haipeng;Xu Guopeng(Guangzhou SCISUN Technology Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]广州长川科技有限公司,广州510663

出　　处：《机电工程技术》2025年第5期143-147,共5页Mechanical & Electrical Engineering Technology

摘　　要：研究一种能够实时识别运行中高压电缆缺陷隐患的方法,通过提前识别可能存在的缺陷隐患,主动快速消除隐患,避免故障延伸,保证钢铁企业电力系统可靠运行。研究利用高压电缆局部放电的形成机理及其信号特点,并通过对电缆局部放电常用监测方法进行分析与比较,选择脉冲电流法(HFCT)获取电缆局部放电信号,并利用宽频带测量、信号预处理、放大电路、数字分频处理及高频采样模块,提高测量的灵敏度、准确度及自适应自调节能力,由此设计建立一套基于高频脉冲电流传感器的局放无线实时监测系统,实时采集并展现高压电缆运行过程中的局部放电图谱。同时将该系统进行了现场化的应用,利用该系统发现某钢铁企业110 kV高压电缆中间接头的局部放电幅值异常,成功排查出高压电缆接地线护套破裂,线芯暴露且与交叉互联箱金属部位存在搭接的隐患,避免该回线路后续因环流异常及局部过热导致的生产安全事故,保障了该钢铁企业的生产运行安全。A method that can identify defects and hidden dangers of high-voltage cables in real-time during operation is studied.By identifying potential defects and hidden dangers in advance,actively and quickly eliminating them,avoiding fault extension,and ensuring the reliable operation of the power system in steel enterprises.The formation mechanism and signal characteristics of partial discharge in high-voltage cables are researched,and the commonly used monitoring methods for cable partial discharge are analyzed and compared.The pulse current method(HFCT)is choosed to obtain cable partial discharge signals,the broadband measurement,signal preprocessing,amplification circuit,digital frequency division processing,and high-frequency sampling modules are used to improve the sensitivity,accuracy,and adaptive self adjustment ability of the measurement.Based on this,a wireless real-time monitoring system is designed and established for partial discharge based on high-frequency pulse current sensors,the partial discharge map is collected and displayed during the operation of high-voltage cables in real time.At the same time,the system is applied on site,and the abnormal partial discharge amplitude of the intermediate joint of a 110 kV high-voltage cable in a certain steel enterprise is discovered.The hidden danger of the high-voltage cable grounding wire sheath breaking,exposed wire core,and overlapping with the metal part of the cross interconnection box is successfully identified,avoiding production safety accidents caused by abnormal circulation and local overheating in the circuit line,and ensuring the production and operation safety of the steel enterprise.

关 键 词：局部放电 在线监测 高频脉冲电流 高频信号采集 

分 类 号：TM247[一般工业技术—材料科学与工程]