一种新的单端行波测距方法

传统的单端行波测距方法存在远端故障测距不准确的问题。提出一种新的单端行波测距方案，其基本原理是故障点故障前电压与故障后初始行波电压相位差为 ，两者相关系数绝对值为1。通过测量点处故障前电压电流和故障后电压电流可以求出故障后初始行波和线路各点处的故障前电压。将各点处的故障前电压与所求初始行波进行相关性计算，得出相对应的相关系数的绝对值。在这些相关系数的绝对值中，数值最大且为1的点即为故障距离。与传统的行波测距方案相比，其测距具有单一值，远端故障也能准确测距。

A new method for single-ended traveling wave fault location

Conventional single-ended traveling wave fault location method exists inaccurate remote location problem. A new single-ended traveling wave solution is presented. The fundamental principle is that there exists phase difference between the fault point voltage before fault and the initial travelling wave voltage and the absolute value of the correlation coefficient between the two is 1. By measuring the pre-fault and after fault voltage and current the initial traveling wave and voltage of the transmission line can be obtained. Of all these absolute correlation coefficients, the one of the largest value is the distance of the fault point. Compared with the traditional traveling wave solutions, the new method can get the fault distance accurately even when the fault point is near the opposite bus bar.