摘要
为了提升电场检测精度,研制配电网单相接地故障的电场检测装置。利用低通调理电路采集传感单元在电场中产生的感应电压,实时计算出线路附近的电场强度。使用COMSOL软件对输电线路单相接地故障情况进行有限元仿真,观察空间电场的变化情况。搭建工频均匀电场试验平台,对PCB传感单元进行电场强度测量校正,验证COMSOL电场强度仿真值。利用验证后的仿真值对平行半圆板电场测量传感单元进行校正,建立输电线路模型,对输电线路发生单相接地故障前后的电场强度进行测量。实验结果表明,当线路A相发生接地故障时,其周围电场强度迅速减小,而B、C两相周围电场强度增大,与仿真结果一致,电场检测精度较高。
In order to improve the accuracy of electric field detection,an electric field detection device for single-phase grounding fault in distribution network is developed.The low pass conditioning circuit is used to collect the induced voltage generated by the sensing unit in the electric field,and the electric field intensity near the line is calculated in real time.Use COMSOL software to carry out finite element simulation for single-phase grounding fault of transmission lines,and observe the changes of space electric field.Build a power frequency uniform electric field test platform,measure and calibrate the electric field strength of PCB sensor unit,and verify the COMSOL electric field strength simulation value.The verified simulation values are used to calibrate the electric field measurement sensor unit of the parallel semicircle plate,establish the transmission line model,and measure the electric field strength before and after the single-phase grounding fault occurs on the transmission line.The experimental results show that when phase A of the line has ground fault,the electric field intensity around it decreases rapidly,while the electric field intensity around phase B and C increases,which is consistent with the simulation results,and the electric field detection accuracy is high.
作者
陈继祥
张自伟
盛启玉
牟宪民
CHEN Jixiang;ZHANG Ziwei;SHENG Qiyu;MU Xianmin(Lianyungang Power Supply Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Lianyungang 223000,China;School of Electricle Engineering,Dalian Universy of Technology,Dalian 116000,China)
出处
《电子设计工程》
2024年第8期148-152,共5页
Electronic Design Engineering
基金
国网江苏省电力有限公司科技项目资助(J2020143)。
关键词
配电网
带电作业
单相接地故障
电场传感器
有限元分析
PCB传感单元
distribution network
live work
single-phase ground fault
electric field sensor
finite element analysis
PCB sensing unit
