波形捕捉下避雷器暂态高频大脉冲阻性电流感知  

Sensing of transient high⁃frequency large pulse resistive current in lightning arrester under waveform capture

作　　者：叶涛 仇利辉 杨晨 刘志远 王晓东 YE Tao;QIU Lihui;YANG Chen;LIU Zhiyuan;WANG Xiaodong(State Grid Ningxia Ultrahigh Voltage Company,Yinchuan 750011,China;Eco-Tech Research Institute of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750002,China)

机构地区：[1]国网宁夏超高压公司,宁夏银川750011 [2]国网宁夏电力有限公司经济技术研究院,宁夏银川750002

出　　处：《电子设计工程》2025年第1期122-126,共5页Electronic Design Engineering

基　　金：国网宁夏电力有限公司科技项目(5229CG220002)。

摘　　要：针对避雷器暂态高频大脉冲波形感知容易受到干扰信号影响,无法获取有效阻性电流的问题,提出了波形捕捉下避雷器暂态高频大脉冲阻性电流感知方法。根据采集的避雷器暂态高频大脉冲阻性电流,分离弱阻性电流与容性电流。计算拟合残差平方,采用最小二乘法求解多项式系数,使拟合残差平方达到最小,以此捕获暂态高频大脉冲波形。分析由拟合点构成的瞬时高频大脉冲信号,区分放电脉冲和干扰信号,采用均方根法计算得到阻性电流。通过实验结果可知,该方法感知的阻性电流变化趋势与实际结果一致,电流感知结果与实际数据最大误差为20μA,能够精准感知阻性电流。To address the issue of lightning arrester transient high⁃frequency large pulse waveform perception being easily affected by interference signals and unable to obtain effective resistive current,a waveform capture based method for lightning arrester transient high⁃frequency large pulse resistive current perception is proposed.Based on the collected transient high⁃frequency large pulse resistive current of the lightning arrester,separate the weak resistive current from the capacitive current.Calculate the square of the fitting residual and use the least squares method to solve for the polynomial coefficients,so as to minimize the square of the fitting residual and capture the transient high⁃frequency large pulse waveform.Analyze the instantaneous high⁃frequency large pulse signal composed of fitting points,distinguish the discharge pulse and interference signal,and calculate the resistive current using the root mean square method.According to the experimental results,it can be seen that the perceived trend of resistive current by this method is consistent with the actual results.The maximum error between the current perception results and the actual data is 20μA,which can accurately perceive resistive current.

关 键 词：波形捕捉 避雷器 暂态高频 大脉冲 阻性电流感知 

分 类 号：TN87[电子电信—信息与通信工程]