基于S变换的行波法高压输电线路故障定位

Traveling Wave Fault Location Method for High Voltage Power Transmission Lines Based on S-transform

利用S变换可以独立地分析信号各个频率分量上的幅值变化,观察暂态行波频率的幅频特性可以判断信号突变的时刻,进而可以实现输电线路的故障定位。用GPS同步采集输电线路双端故障前后一段时间的电压数据,对其进行S变换得到幅值-时间曲线,确定突变点即行波波头到达时刻。仿真结果表明,该方法能准确捕捉行波波头的到达时刻,具有较高的定位精度。

S-transform can be independently used to analyze the amplitude variation of the signal on each frequency component. The moment of sahation in the signal can be determined by observing the amplitude and frequency charac- teristics of transient traveling waves, and the fault location of power transmission lines can be achieved. It is necessary to collect synchronously the voltage signals by GPS at both ends of the transmission lines before and after the fault hap- pened. Amplitude-time curve, which shows the amplitude saltation points, can be obtained by S-transform. Simula- tion results show that this method can precisely grab the arrival time of the wave head with high accuracy.