Fault diagnosis of circuit breakers based on time–frequency and chaotic vibration analysis

Mechanical malfunction is a main failure mode for circuit breakers (CBs). Vibrations generated from CB switching operations contain rich information of its mechanical condition. However, the vibrations are highly time-varying and non-stationary, which makes it very difficult to precisely extract effective features for machinery fault diagnosis. This study presents a methodology to obtain the CB vibration characteristics based on time–frequency...