基于基频电气量的输电线路故障测距的滤波探讨

Discussion on fault location filter of transmission line based on basic frequency measurement

对于采用基频电气量进行输电线故障测距的方法,基频分量提取的精度与故障测距的精度有着直接的关系。本文总结了故障测距过程中遇到的问题及解决方法,通过对不同滤波器的性能的比较,发现故障测距中,滤波的作用非常大。测距结果表明,当电力系统中存在着大量的非周期分量和高次谐波时,只有当滤波的精度满足一定的要求后,故障测距的精度才能完全满足现场要求。

When applying basic frequency measurement to fault location of transmission line, the extracting accuracy of fundamental component is influenced by fault location accuracy. On the basis of problem related to fault location and its solution, the authors consider that filter accuracy is very important in fault location through comparison of different filter methods. Fault location result indicates that there is much non-periodic component and high harmonics when fault occurs. Only if the filter accuracy is very high,can the fault location accuracy meet the running requirements of power system.