【摘要】 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。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。更多还原

【Abstract】 The failure or disturbance of power system always follow along with the abrupt change of current and voltage.And the window size of wavelet transform has the adaptability,when reducing the values of scale parameter,the window width can be narrowed and the high-frequency window can be increased,which is beneficial to detect the signal of abrupt change.On the basis of the introduction of wavelet transform,the activated criterion method of transmission line fault location device based on the principle of traveling wave is constructed by establishing the relationship between the failure characteristics of fault traveling wave and the modulus maxima of wavelet transform,which can quickly detect the instant signal of abrupt change of current or voltage when fault occurs.更多还原