Research of Typical Mechanical Fault Diagnosis for HV Circuit Breaker Based on Vibration Signals

High voltage circuit breaker is an important switchgear of the power system. For opening and closing within a few mili-seconds, it is highly sensitive with speedy transmission and great reliability. According to statistics, 63.8 percent of fault of high voltage circuit breakers is caused by mechanical faults. In this work, considering a high voltage circuit breaker as the subject, the vibration signal under typical mechanical faults are collected based on some testing, including spring failure, clearance error, cam eccentricity, over the dead point and so on. Then the intelligent diagnosis model for HV circuit breaker based on vibration signals is established to realize the feature extraction and fault identification. The results indicate that the fault diagnosis rate is up to 94% under the current samples.