Monitoring and diagnosis methods for high voltage distribution cabinets

Online detection of mechanical characteristics, Power distribution cabinet monitoring contents include: closing and opening coil circuit, closing and opening coil current, voltage, circuit breaker moving contact stroke, circuit breaker contact speed, closing spring state, mechanical vibration during circuit breaker operation, circuit breaker operation times statistics, etc. At present, circuit breaker mechanical state monitoring mainly includes stroke and speed monitoring, vibration signal monitoring during operation, etc. The mechanical vibration signal monitoring during circuit breaker operation is based on the change of each vibration signal occurrence time and peak value, combined with the closing and opening coil current waveform to judge the mechanical state of the circuit breaker.