A Discussion on Optimal Wavelet Basis for Data De-Noising of Insulator Leakage Current

Insulator leakage current contains important information which can reflect the condition of insulators. However, it is always swallowed by many other noises which hinder us to get precise signals. Wavelet transform is a kind of new method which has been widely used in signal-de-noising because of its good frequency effect. However, suitable wavelet bases should be used to guarantee better effect. In this paper, we compared three groups of wavelet basis: db/coif/sym in hunt for the most relative suitable wavelet basis for insulator leakage current signal. Experiment results prove the conclusion later.