摘要
为了解决用行波法定位雷击故障时,多级多分支的分流可能引起电流幅值衰减迅速以及低采样影响定位准确度等问题,仿真分析了分布式电流监测终端采样率对故障行波到达时间标定、故障定位精度的影响,以及分支数对雷电流沿线衰减率的影响规律。仿真结果显示:设备采样率达10MHz才可满足定位精度需求,相同距离内分支数越多雷电流衰减率越大。结果表明,采样率应不低于10MHz;终端布点原则为相邻终端间距离应小于3km,且分支节点数应小于5个。
In order to solve the problems of rapid attenuation of current amplitude and low sampling affecting positioning accuracy caused by multi-level and multi-branch diversion when using traveling wave method to locate lightning faults,the simulation analyses were conducted to the calibration of the arrival time of fault traveling waves and the impact of fault positioning accuracy on the sampling rate of distributed current monitoring terminals,as well as the influence of branch number on the attenuation rate of lightning current along the line.The simulation results indicate that a sampling rate of 10 MHz is necessary to meet the positioning accuracy requirements,and the more branches there are within the same distance,the greater the attenuation rate of lightning current.The experimental findings show that the sampling rate should not be lower than 10 MHz and the principle of terminal layout is that the distance between adjacent terminals should be less than 3 km,and the number of branch nodes should be less than 5.
作者
黄军杰
韩永霞
吴忠洋
冯瑞发
肖小兵
李立浧
Huang Junje;Han Yongxia;Wu Zhongyang;Feng Ruifa;Xiao Xiaobing;Li Licheng(South China University of Technology,Guangzhou Guangdong 510641,China;Electric Power Research Institute Co.,Ltd.,CSG,Guangzhou Guangdong 510663,China;Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang Guizhou 550002,China)
出处
《电气自动化》
2025年第3期90-93,共4页
Electrical Automation
基金
贵州电网有限责任公司电力科学研究院项目“山区配网线路雷害全过程协同防护关键技术研究及应用”(GZKJXM20200772)。
关键词
行波
配电线路
监测终端
采样频率
布点方案
traveling wave
distribution lines
monitoring terminal
sampling frequency
layout plan
