高速铁路牵引网故障行波频谱成份分析

基于FFT频谱分析和FIR滤波技术原理对实际高速铁路牵引网馈线跳闸时的行波信号频谱进行了分析。结果显示:在(10～300)kHz频段,反射行波信号幅值较小,噪声信号幅值较大,整体波形在原点附近持续振荡;在(300～600)kHz频段,整体波形未发生明显的振荡,但在幅值较大的行波波头信号后,有较严重的拖尾峰存在。从600 kHz开始,随着频率的增加,行波信号的幅值慢慢下降,但主峰幅值信号下降的速度明显低于其后振荡过程中信号幅值的下降速度。

The Analysis of High Speed Railway Traction Nets Fault Traveling-wave Spectrum Component

The analysis of traveling wave signal spectrum of high speed railway traction nets feeder trip based on the FFT spectrum analysis and FIR filter technology principle in this paper, the results showed that in the 10KHz to 300KHz band, the amplitude of the traveling wave signal reflected was small, of which noise signal was large, whole waveform was sustained oscillation near the origin. In the 300KHz to 600KHz band, whole waveform did not produce significant oscillation, but existing a serious tailed peak after the larger amplitude traveling-wave head signal. From the beginning of 600KHz, the amplitude of the traveling-wave signal dropped slowly along with the increase of the frequency, but the descending speed of the amplitude of the main peak was significantly lower than the amplitude of the later oscillation signal in the process.