The mechanical fault diagnosis for hv breakers on the wavelet packet analysis

AIn this paper, a fault diagnosis method to vibration signals of high voltage breakers is introduced The new method is based on the waveletpacket transform and the energy spectrum of wavelet packet is as the characteristic parameter of the fault diagnosis for the high voltage breakers. The given signal is decomposed to thefiner frequency band by the random time and frequency resolution nnd the frequency resolution of signal processing is improved using the wavelet packet transform. The signal from the wavelet packet orthogonal decomposition in each frequency band is independent and its energy is conserve. The simulating results demonstrate that it is valid to use the wavelet packet analysis transform in mechanic fault diagnosis of high voltage breakers.