考虑金属护层耦合的高压电缆单相接地故障定位方法  

Single phase ground fault location method for high voltage cables considering the metal sheath coupling

作　　者：袁超[1] 储海军 陈燕擎 梅睿 钱鹏 王冠华 郭振华[2] 梁睿[2] YUAN Chao;CHU Haijun;CHEN Yanqing;MEI Rui;QIAN Peng;WANG Guanhua;GUO Zhenhua;LIANG Rui(Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211100,China;China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211100 [2]中国矿业大学,江苏徐州221116

出　　处：《电力系统保护与控制》2021年第2期115-120,共6页Power System Protection and Control

基　　金：2017年国家重点研发计划(2017YFC0804400);国家自然科学基金项目资助(52077215);江苏方天电力技术有限公司科技项目资助(KJ201914)。

摘　　要：针对电缆导芯和金属护层之间存在电磁耦合影响故障定位准确精度的问题,提出一种考虑金属护层耦合的高压电缆故障定位方法。该方法通过双τ分布参数模型建立电缆导芯和金属护层耦合关系,利用首末端的电气量,进而确定电缆导芯分布电压的表达式。然后以首末端分别计算的故障点导芯电压瞬时值差值来构造定位判据,同时对不良数据进行有效剔除,采用混沌粒子群搜索法求解故障精确位置。利用PSCAD/EMTDC仿真模型所得数据进行计算,结果表明在不同故障距离、故障电阻下所提故障定位算法都具有较高的精度。Aiming at the problem of electromagnetic coupling between the cable core and metal sheath,which has impact on the accuracy of fault location,a method for fault location of high-voltage cables considering the metal sheath coupling is proposed.This method establishes the coupling relationship between the cable core and metal sheath through a doubleτdistribution parameter model,and uses the double-end electrical quantity of the cable to determine the expression of the cable core distributed voltage.Then the locating criterion is constructed by using the difference between the instantaneous value of the core voltage at the fault point.At the same time,the bad data is effectively eliminated,and the chaotic particle swarm search method is used to solve the exact fault location.The calculation results of the data obtained by establishing the PSCAD/EMTDC simulation model show that the proposed fault location algorithm has high accuracy under different fault distance and fault resistance.

关 键 词：配电网 单芯电缆 分布参数 金属护层 故障定位 

分 类 号：TM75[电气工程—电力系统及自动化] TM862