基于EEMD与边际谱能量的电缆局部放电定位方法  

Cable partial discharge location method based on EEMD and marginal spectral energy

作　　者：刘宇舜 程登峰 殷巧玲 李森林 夏令志 严波 LIU Yushun;CHENG Dengfeng;YIN Qiaoling;LI Senlin;XIA Lingzhi;YAN Bo(State Grid Anhui Electric Power Co.,Ltd.Research Institute,Hefei 230601,China;State Grid Hefei Power Supply Company of Anhui Electric Power Co.,Ltd.,Hefei 230061,China;State Grid Anhui Electric Power Co.,Ltd.,Hefei 230022,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,安徽合肥230601 [2]国网安徽省电力有限公司合肥供电公司,安徽合肥230061 [3]国网安徽省电力有限公司,安徽合肥230022

出　　处：《电力工程技术》2022年第1期156-164,共9页Electric Power Engineering Technology

基　　金：国家电网有限公司总部科技项目(52120517000X)。

摘　　要：振荡波局部放电试验在电缆绝缘缺陷检测中得到了越来越多的研究和应用,但背景噪声干扰和放电脉冲匹配的问题会影响局部放电定位的准确度。为实现振荡波电压下电缆绝缘缺陷的准确定位,提出一种基于集合经验模态分解与Hilbert边际谱能量的局部放电定位方法。首先采用移动窗口阈值法提取出局部放电脉冲信号,采用集合经验模态分解算法对信号进行分解,对得到的各分量进行Hilbert变换获得其边际谱能量值;然后选择不同本征模态函数分量在原始信号边际谱能量值的占比作为特征量,计算信号相似度进行入射脉冲信号和反射脉冲信号的匹配,最终采用时域反射法进行局部放电定位;最后对35 kV电缆进行振荡波耐压试验,对检测到的局部放电信号进行定位计算。结果表明,提出的方法可以在高斯白噪声较强的情况下实现电缆绝缘缺陷定位,定位平均误差可以达到1.15%。The oscillation wave partial discharge test has been used more and more in the detection of cable insulation defects,but the background noise interference and discharge pulse matching affect the accuracy of partial discharge location.A partial discharge localization method based on ensemble empirical mode decomposition and Hilbert marginal spectral energy is proposed to locate cable insulation defects accurately under oscillating wave voltage.Firstly,the partial discharge pulse signal is extracted by moving window threshold method.Then,the ensemble empirical mode decomposition algorithm is used to decompose the signal,and Hilbert transform is applied to each component to obtain its marginal spectral energy value.The proportion of different eigen modal function components in the original signal marginal spectral energy value is selected as the characteristic quantity,the signal similarity is calculated to match the incident pulse signal and the reflected pulse signal,and finally the partial discharge location is carried out by the time domain reflection method.The vibration wave withstand test is carried out on 35 kV cable,and the detected partial discharge signal is located and calculated.The results show that the pro-posed method can realize the location of cable insulation defect under the condition of strong Gaussian white noise,and the average location error can reach 1.15%.

关 键 词：电缆 振荡波 局部放电定位 集合经验模态分解 Hilbert边际谱能量 信号匹配 

分 类 号：TM844[电气工程—高电压与绝缘技术]