基于行波原理的10 kV电缆网络分布式故障定位方案

在线故障测距对于城市10 kV电缆线路的故障查找与修复非常重要，由于配电线路结构复杂，不能直接应用现有单端或双端行波测距技术，无法迅速对故障点进行准确测距和排查抢修，对居民生活和企业生产带来一定不便和经济损失。本文分析了典型10 kV电缆网络接地故障时的电压与电流行波特征及其在线路中（特别是环网柜、线路末端处）的折反射规律，阐述了一种安装于环网柜与线路末端的分布式故障行波测距系统的系统构成、工作原理，并给出了高速数据采集、传感器采集频带选取和线路末端电流行波获取方法等关键技术方案，利用多例现场实例验证了该技术与系统的可靠性和准确性。

Distributed fault location scheme for 10 kV cable network basedon traveling wave principle

On-line fault location distance measurement is very important for fault detection and repair of urban 10 kV cable lines. Because of the complex structure of distribution lines, the existing single-terminal or double-terminal traveling wave location technology for measuring distance cannot be directly appliedIt is impossible to locate the fault point accurately, check and repair it quickly, which brings certain inconvenience and economic loss to residents′ life and enterprise production. In this study, the characteristics of voltage and current traveling wave and the refraction and reflection laws in a typical 10 kV cable network are analyzed when grounding fault occurs, particularly in the ring cabinet and at the end of the line.This paper presents the system structure and working principle of a distributed fault traveling wave ranging system installed in the ring network cabinet and the end of the line, as well as the key technologies such as high-speed data acquisition, sensor acquisition frequency band selection and the end of the line current traveling wave acquisition method,The reliability and accuracy of the technology and system are verified using several field examples.