The stability of the operating time of the circuit breaker mechanism is a key indicator affecting the accuracy of phase selection control. To study the complete factors and their influence degrees that affect the operating time of the high-voltage circuit breaker with a spring mechanism

this paper establishes a coupled simulation model of the electromagnetic field - operating mechanism dynamics - arc extinguishing chamber airflow field starting from the geometric model of the mechanism

achieving a complete simulation chain of the high-voltage circuit breaker's entire process. The model's accuracy is verified through experiments The results show that the stroke

speed

coil current

and breaking point signal are all in good agreement with the simulation results. The error of each phase's opening and closing time is within ±5%. Based on the coupled simulation model

the mechanism analysis of the influence of control voltage

opening and closing spring force

air pressure

and friction coefficient of rotating parts on the operating time is further conducted; a unified quantitative assessment is made by defining the influence index of opening and closing time. The results indicate that among the rotating parts

the friction coefficient of the camshaft has the greatest influence index on the closing time(1.201)

and the friction coefficient of the outer rocker arm transmission shaft has the greatest influence index on the opening time(0.616). Besides the friction coefficient

the opening and closing spring force has the greatest influence index on the opening and closing time(0.497 for closing and 0.441 for opening)

and the air pressure has the smallest influence index(0.047 for closing and 0.063 for opening).