Abstract

In the analysis of mechanical vibration signal of circuit breaker, the extraction of vibration event is an effective method for the signal time domain analysis and a reliab1e way to realize the fault diagnosis of the circuit breaker. The vibration signal is similar to the speech signal, both of them belong to the non-stationary signal, so in this paper, the short-time energy method is used in the analysis of vibration signal, after given the selection princip1 a of window function and window length, then analysis the effect of the method in improving signal SNR (Signal- Noise Ratio), highlighting and extracting the vibration events and compare with other method, the result shows that the short- time energy method not only can significantly improve the signal JVR, but also an effective way to extract the occurrence of vibration events.

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