基于暂态行波的10 kV自闭贯通线路单相接地故障定位研究  

Fault Location of Single-phase Earthing of 10 kV Automatic Blocking Through Line based on Travelling Wave

作　　者：谭贵宾 TAN Guibin

机构地区：[1]中国铁路南宁局集团有限公司供电部

出　　处：《电气化铁道》2022年第1期17-22,共6页Electric Railway

基　　金：中国铁路南宁局集团有限公司“电力贯通(自闭)线故障测距技术研究(供20-2)”。

摘　　要：10 kV自闭贯通线路一般为小电流接地系统,其在发生单相接地时一般可带故障运行2 h,目前尚无有效的自闭贯通线路故障距离保护方案。本文基于自闭贯通线路特殊的线路走廊和通信环境,对10 kV自闭贯通小电流接地系统行波法故障测距进行研究。采用A型单端行波故障测距法,对于单相接地时波形数据处理问题,利用小波变换监测信号奇异性来提取故障时刻暂态波头时刻,并根据单端法故障测距原则及折反射原理进行故障精确定位。针对不同的故障类型分别利用ATP-EMTP建模仿真分析,仿真结果表明,在不同故障类型下该故障测距方案具有较高的精确性和稳定性。10 kV automatic blocking through line is generally a low current earthing system,which is able to operate for 2 hours with fault when single-phase fault is presented.At present,there is still no effective fault distance protection scheme for the automatic blocking through line.The paper,based on the special line corridor and communication environment of the automatic blocking through line,studies the travelling wave fault location of low-current earthing system of 10 kV automatic blocking through line.A type single terminal travelling wave fault location method is adopted.For the issue of processing of travelling wave data when single-phase is earthed,the singularity of wavelet transform monitoring signal is used to extract the fault time and transient wave head time,and the fault is accurately located according to the fault location principle of single terminal method and catadioptric principle.According to different fault types,ATP-EMTP is used for modeling and simulation analysis.The simulation results show that the fault location scheme has high accuracy and stability under different fault types.

关 键 词：小电流接地系统 故障测距 小波变换 仿真研究 

分 类 号：U226.5[交通运输工程—道路与铁道工程]