35kV配电网单相接地故障综合定位方法

A Compositive Fault Location Method for Single-Phase Earth Fault in 35kV Distribution Network

基于C型行波法和交流信号注入法提出35 kV配电网单相接地故障的综合定位方法:首先采用C型行波法进行初步定位,确定故障距离和故障所在区段,然后用交流信号注入法进行精确定位。文章给出了基于综合定位法的故障定位装置的软、硬件设计方案,采用C8051F310单片机实现了高压脉冲信号发生器和交流信号发生器的一体化智能控制。综合定位法充分发挥了行波法定位速度快、交流注入法定位误差小的优点,适用于过渡电阻小于3 kΩ的35 kV配电网铁塔线路单相接地故障的定位。

Integrating C-type of traveling wave location method with AC signal injection method, a compositive location method for single-phase earth fault in 35kV distribution network is proposed, in which firstly the fault is presumedly located by C-type of traveling wave location method to preliminarily determine the position where fault occurs; then the fault is accurately located by AC signal injection method. Based on the proposed location method, the design scheme of software and hardware for location device of 35kV single-phase earth fault in distribution network is given, and by use of single chip microprocessor C8051F310 the integrated intelligent control of high voltage pulse signal generator and AC signal generator is implemented. The proposed compositive location method gives full play to the advantage of high location speed of traveling wave location method and that of low location error of AC signal injection method, the designed device is suitable to the fault location of single-phase earth fault of 35kV transmission lines erected on iron towers and their transition resistances are less than 3kΩ.