Dynamic Characteristics Research on Single Stable Permanent Magnetic Actuator Applied in 12kV Vacuum Circuit Breaker

The permanent magnetic actuator is widely used in distribution network system for its advantages of few parts, high reliability and controllable parameters. In order to meet the development requirements of miniaturization and intelligence for the high voltage circuit breaker, the matching characteristics of circuit breaker and actuator are researched under the opening and closing operation. The single stable permanent magnetic actuator is designed and give out the structure size parameters, which the variation characteristics of magnetic field are analyzed during the opening and closing operation. So the stroke characteristic curve of contact are obtained under rated operating voltage and different operating voltage by establishing a test system. The results show that the single stable permanent magnetic actuator can meet the operating requirements of vacuum circuit breaker. In the rated operation, the average opening speed is about 1.2m/s, the average closing speed is about 0.53m/s, the maximum rebound of contact is 4mm. In the different operating voltage, the average closing speed or opening speed along with the increase of operating voltage. The operating voltage increases by 10V, the average opening speed increases 0.2m/s, and the average closing speed increases 0.1m/s.