输电线路暂态信号检测方法比较分析

输电线路发生故障产生的暂态行波是一个突变的、具有奇异性的信号，正确检测出信号的突变点即暂态行波波头是利用行波进行保护和测距的核心。对电网中断路器操作、电容投切、一次电弧、单相短路、雷击等产生的暂态信号进行了仿真．并分别利用小波变换模极大值、小波变换Lipischitz a、小波变换能量谱检测行波波头进行比较分析。EMTP仿真分析表明，三种方法均有提取行波特征，且采用小波能量谱检测输电线路暂态行波波头到达的时刻最精确，故障定位精度最高。

Comparative Study on Detection Scheme for Transient Signal of Transmission Line

Transient traveling wave, which come into being when a fauh occurs in a transmission line, is an abrupt and singular signal. It is the key to detect the mutational point or transient traveling wave head for protection or fault location by traveling wave. The transient signal generated by the breaker operation, switching of capacitors, arcing fault, single phase grounding fault and lighting fault are simulated by EMTP in this paper. The traveling wave head can be detected in comparison with the wavelet modulus maxima, wavelet Lipischitz a and the wavelet energy spectrum. EMTP simulation results show that the wavelet energy spectrum analysis is more effective and accurate.