基于双轴磁场轨迹的架空线路接地故障定位方法  

A Single Phase to Ground Fault Location Method for Overhead Lines Based on Dual-Axis Magnetic Field Trajectory

作　　者：郭亮 辛建波 杜欢[2] 黄瑶[3] 王晓卫 GUO Liang;XIN Jianbo;DU Huan;HUANG Yao;WANG Xiaowei(Electric Power Research Institute,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,Jiangxi,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,Shaanxi,China;Jiangxi Vocational&Technical College of Electricity,Nanchang 330000,Jiangxi,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330000 [2]西安理工大学电气工程学院,陕西西安710054 [3]江西电力职业技术学院,江西南昌330000

出　　处：《电网与清洁能源》2024年第4期28-34,共7页Power System and Clean Energy

基　　金：国家自然科学基金项目(52177114);国网江西省电力有限公司科技项目(521820210005)。

摘　　要：为解决当前配电网区段定位困难的问题,探究了架空线下磁场的分布及其与三相电流之间的关系,提出一种基于磁场的非接触式故障定位方法。通过最小二乘法拟合得到x轴、y轴上的磁场正弦函数;将合成的李萨如图形与椭圆一般方程相对应,得到磁场轨迹结构的特征量表达式;通过分析双轴合成的磁场椭圆在故障点上、下游特征量的差异来定位故障区段。相较于其他基于电气量的定位方法,所提方法因具有磁阻传感器低成本的优势,可获得更多的线路运行状态信息,更适用于复杂配电网的故障定位。大量仿真验证表明,该方法适应于不同类型的故障工况。To address difficulties in the section location of distribution networks,this paper explores the distribution of magnetic field under the overhead line and its relationship with three-phase current and proposes a non-contact fault location method based on magnetic field.First,the sine function of magnetic field on x-axis and y-axis is fitted by the least square method.Second,the characteristic quantity expression of the magnetic field trajectory structure is obtained by corresponding the synthesized Lissajous figure with the ellipse formula.Finally,the difference of the characteristic quantity between the upstream and downstream of the fault point is analyzed to locate the fault section.Compared with other location methods based on electrical quantity,this method can get more line operation state information because of the advantage of low-cost magnetic resistance sensors,and it is more suitable for the fault location of the real distribution of complex topology.Through an analysis of the simulation model built in PSCAD/EMTDC,the adaptability of this method under different working conditions is verified.

关 键 词：磁场测量 配电网 故障定位 李萨如图形 

分 类 号：TM77[电气工程—电力系统及自动化]