基于局放信号衰减的电缆故障定位方法及验证  

Cable Fault Location Method and Verification Based on Attenuation of Local Discharge Signal

作　　者：斯捷 陈植 金利引 赵建 曹铁军 Si Jie;Chen Zhi;Jing Liyin;Zhao Jian(Zhejiang Tusheng Power Transmission and Transformation Engineering Co.Ltd.,Wenzhou 325000,Zhejiang,China)

机构地区：[1]浙江图盛输变电工程有限公司,浙江温州325000 [2]重庆大学

出　　处：《云南电力技术》2025年第1期86-89,100,共5页Yunnan Electric Power

摘　　要：针对电缆局部放电定位困难问题,提出了一种利用局放信号在电缆中传输引起的脉宽变化的电缆故障定位的方法,以推算电缆局部放电源的位置。通过采集高频脉冲电流互感器获取局部放电信号波形,并提取波形中主峰的脉冲宽度。随后建立基于脉冲宽度变化的电缆局部放电源测距模型,计算互感器到局部放电源之间的距离,从而实现精确地定位电缆故障。使用注入模拟局放信号和真实的局部放电实验验证了该方法的有效性,结果表明该方法能够准确地确定局部放点信号源,并在实际条件下仍具有较高准确率。A method for locating partial discharge(PD)sources in power cables has been proposed,which utilizes the pulse width variation(PWV)of the PD signals transmitted through the cable to deduce the position of the PD source.By acquiring the PD signal waveforms using a high-frequency pulse current transformer(HFCT)and extracting the pulse width of the main peak in the waveform,a distance measurement model based on pulse width variation for cable PD sources is established.This model calculates the distance between the mutual inductor and the PD source,thereby achieving precise localization of cable faults.The effectiveness of this method was verified through experiments involving the injection of simulated PD signals and real PD events,demonstrating that the method can accurately identify the source of PD signals and maintains a high accuracy rate under practical conditions.

关 键 词：高压电缆 局部放电 电缆故障定位 

分 类 号：TM74[电气工程—电力系统及自动化]