The wavelet packet theory has the good hour-frequency characteristic, it can be availably used for the noise suppression processing of the digital signal and withdrawing the signal characteristic.
小波包分析具有优良的时频特性，可以有效地用于数字信号的消噪处理和对信号进行特征提取。
To the scheme of mechanical on load tap changer combined with thyristors, its characteristic of arc suppression is analyzed in details, and a corrected scheme is then present.
介绍了有载分接开关切换波形测试的意义、原理和方法，指出现场测试经常遇到的问题并分析了其原因，提出了根据现场所测波形判断有载分接开关能否正确切换的方法。
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