基于小波变换的电力系统故障测距装置启动判据方法

A Method of Power System Fault Location Device Activated Criterion Based on Wavelet Transform

电力系统故障或扰动时伴随着电流电压的突变,而小波变换的窗口大小具有自适应性,当减小尺度参数a的取值时,可以使时窗宽度变窄、频窗高度增大,有利于检测突变信号。本文在介绍小波变换的基础上,通过建立故障行波的故障特征与小波变换模极大值之间的关系,构造了一种基于行波原理的输电线路故障测距装置启动判据方法,可以在故障发生的瞬间快速检测出电流或电压突变量信号。

Power system failure or disturbance, along with the current and voltage mutation, and wavelet transform window size of adaptability, when a reduced scale parameter values, the window width can be narrowed,high-frequency window increases,beneficial mutation detection signal.This paper introduces wavelet transform, on the basis of failure to wave through the establishment of the failure characteristics and wavelet transform modulus maxima of the relationship between structure, which is based on the principle of traveling wave transmission line fault location device activated criterion method ,Fault occurred in the instant quickly detected mutation of current or voltage signal.