基于沿线电流故障分量差值的交叉互联电缆故障测距  

Fault location of cross connecting cable based on fault component difference of along current

作　　者：杨明嘉 夏成军[1,2] 池梓斌 赖胜杰 陈晓儒 黄龙毅 YANG Mingjia;XIA Chengjun;CHI Zibin;LAI Shengjie;CHEN Xiaoru;HUANG Longyi(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Guangdong Province’New Energy Power System Intelligent Operation and Control Enterprise Key Laboratory,Guangzhou 510663,China;Huizhou Power Supply Bureau,Guangdong Power Grid Limited Liability Company,Huizhou 516001,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东省新能源电力系统智能运行与控制企业重点实验室,广东广州510663 [3]广东电网有限责任公司惠州供电局,广东惠州516001

出　　处：《电力系统保护与控制》2023年第19期54-66,共13页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2022YFB2403500);南方电网公司科技项目资助(031300KK52200003)。

摘　　要：为解决长距离高压电缆采用交叉互联接地方式时故障测距较为复杂的问题,提出基于沿线电流故障分量差值分布的交叉互联电缆故障测距方法。首先,通过故障发生前后护层环流判断电缆故障区段。其次,考虑线芯与护层之间的耦合关系,基于双π模型推导电缆不同区段发生故障时的沿线电压、电流方程。在此基础上,通过求解电流故障分量差值函数零点得到故障距离,并结合切线方程对所得故障距离进行修正。最后,搭建电缆故障模型对测距方法进行仿真验证。结果表明,所提方法测距误差为1%左右,具有较高的准确性,对采用交叉互联接地方式的电缆实现故障测距具有一定的参考意义。In order to solve the complicated fault location problem for long distance high voltage cables using cross interconnection grounding method,a fault location method for cross interconnection cables based on the fault components difference distribution along the current is proposed.First,the cable fault section is determined by the sheath circulation before and after the fault occurs.Second,considering the coupling relationship between the core and the sheath,the voltage and current equations along the cable when faults occur in different sections are derived based on the doubleπmodel.On this basis,the fault distance is obtained by solving the fault component difference function zero,and the fault distance is modified by the tangent equation.Finally,a cable fault model is built to verify the ranging method.The results show that the proposed method location error is about 1%,which has a high accuracy,and has a certain reference significance for the fault location of cables using the cross-connected grounding mode.

关 键 词：高压电缆 交叉互联 双π模型 故障分量 故障测距 

分 类 号：TM75[电气工程—电力系统及自动化]