基于振动信号的交流中压真空断路器故障诊断技术研究

The vibration signal during the breaking process of a circuit breaker contains a wealth of mechanical features, so mechanical fault diagnosis of the equipment can be studied by extracting the vibration signal. In this paper, for a 12 kV AC medium-voltage vacuum circuit breaker, its vibration signals in normal and fault conditions are collected by the self-made on-line monitor of circuit breaker. The short-time energy method, the total energy analysis method and the information entropy method are employed to analyze and process the vibration signals. This monitor device can capture characteristic information of vibration event and distinguish normal or fault state, hence it can be taken as a tool for implementation of on-line fault diagnosis technology of circuit breakers.