一种不受波速影响的单端行波故障测距新算法

A new single termianal fault locating algorithm unaffeated by the traveling wave velocity

采用提升小波变换和奇异性检测原理对电流行波到达母线测量端的时刻进行检测.首先利用初始行波、故障点反射波及对端母线反射波计算出行波波速,然后在常规单端行波故障测距算法的基础上,通过消去行波波速参数,提出一种不受行波波速影响的单端行波故障测距新算法.PSCAD和MATLAB仿真验证结果证明该方法具有很高的测距精度和实用性.

The traditional single terminal traveling wave fault location algorithm needs to consider the wave velocity, and is prone to large range error. Traditional single terminal fault location methods consider the wave velocity and tend to be inaccurate. In this paper, lifting wavelet trans-form and singularity detection are used to detect the moment that current wave reaches the meas-uring terminals. Firstly, initial current wave, fault reflected wave as well as peer bus reflected wave are utilized to calculate wave velocity. Then, based on the traditional single terminal fault location algorithm, a new single terminal fault location algorithm unaffected by traveling wave velocity is put forward by eliminating wave velocity parameters. Finally, the high accuracy and practicality are proved by the results of PSCAD and MATLAB simulation.