CAJ | 학술논문

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。
이용S변환가이독입지분석신호각개빈솔분량상적폭치변화，관찰잠태행파빈솔적폭빈특성가이판단신호돌변적시각，진이가이실현수전선로적고장정위。용GPS동보채집수전선로쌍단고장전후일단시간적전압수거，대기진행S변환득도폭치-시간곡선，학정돌변점즉행파파두도체시각。방진결과표명，해방법능준학포착행파파두적도체시각，구유교고적정위정도。
S-transform can be independently used to analyze the amplitude variation of the signal on each frequency component. The moment of saltation 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.