Given the inadequacy of insufficient coupling of the all the fields in the existing simulation models, a new model, one which can forecast the operating time of the vacuum circuit breaker with permanent magnetic actuator, is proposed. The model considers the influence of the eddy current. This itself is mainly affected by the excitation variations and the velocity effect of the movable parts. Different from existing models, the new model obtains the coupling solution of the complex mechanical movement, the electronic transient circuit and the transit magnetic field with eddy current influence involved. The paper forecasts the operating time of a vacuum circuit with permanent magnetic actuator. The experiment shows the accuracy of the model. Then, this paper analyzes the influence factors, such as the excitation voltage, the environmental temperature, the iron material and the excitation mode, for the time dispersion of the breaker. The results also reveal the influencing mechanisms of the factors on the time dispersion of the breaker.

This work is supported by the National Natural Science Foundation of China (No. 51777005).