Abstract:

The dynamic model of air circuit breaker mechanism is established in the NX Motion software,and motion joins,contacts and springs are created according to physical truth.Many performance parameters are obtained by the dynamic simulation analysis of air circuit breaker,such as the principle axis rotation angle,closing and opening time,the angle between the upper and lower links,final pressure,opening range,overtravel,energy storage torque,tripping force and so on.The angle between the upper and lower links is go through the dead point angle,when closing the air circuit breaker.The correctness of the simulation model is verified by the comparison between dynamic simulation results and experimental results.The results of the dynamic simulation provide reference basis for the design and optimization of air circuit breaker.The dynamic simulation technique shortens the development cycle and reduces development costs compared with traditional method.

Key words: air circuit breaker, operating mechanism, dynamic simulation, NX Motion, motion simulation