摘要
变压器局部放电超声波信号在变压器内部中传播复杂 ,探头所接受到的超声波信号是一种时频有限的非平稳信号 ,所以运用小波分析处理超声波信号十分有效。通过实验得到处理超声波信号最合适的小波 ,同时给出合适的小波参数 ,最后对实际得到的超声波信号进行处理 。
Monitoring partial discharge is important for diagnosing insulation fault in transformers. Ultrasonic signal method is the main way to locate partial discharge in transformers, because transmitting modes of ultrasonic signal in transformers are very complicated. The ultrasonic signal is non smoothness signal with finite time frequency, so it is very effective to process ultrasonic signal utilizing wavelet conversion. The most ideal wavelet for analyzing ultrasonic signal and the way to select parameters of wavelets are presented. Finally, the actual ultrasonic signal in transformers model is processed. A conclusion can be drawn that the method of using wavelet analysis to process ultrasonic signal can improve the partial discharge location precision in transformers.
出处
《电力情报》
2002年第1期30-31,43,共3页
Information on Electric Power
