On-line Monitoring and Evaluation of Mechanical Characteristic Condition of Switchgear

In this paper, through the monitoring case on the mechanical characteristics of the circuit breaker in service operation, analyzed the problems such as when the circuit breaker is in the running process whether is abnormal, potential faults or defect types, the potential fault parts, etc, and had a maintenance to the products with potential failures that may endanger the operation, and verified the potential fault diagnosis by the actual products. This paper uses the advanced on-line monitoring system of high voltage circuit breaker for monitoring circuit breaker closing and opening motions and current waveform of closing and opening coil, to obtain spring running state and monitoring the spring fatigue performance at any time. It solves the problem that the spring which is most important component of operating mechanism is difficult to monitoring in the running status. Meanwhile, we can determine common fault from the current waveform of closing/opening coil, such as whether the coil is binding or auxiliary switch is failures and so on. It provides effective guarantee of reliable safety runs for circuit breakers.