基于虚拟样机技术的真空断路器合闸动态特性计算及影响因素分析OA

Research on how to improve the dynamic characteristics of permanent magnet operating mechanism to re⁃duce the contact closing bounce phenomenon is of great significance for enhancing the operating performance of vac⁃uum circuit breakers.Ansoft Maxwell is used in this paper to set up the electromagnetic field simulation model of the permanent magnet operating mechanism for 12 kV vacuum circuit breaker.The size parameters of the perma⁃nent magnet and the plunger of the mechanism are optimized by parametric modeling and simulation technology,and the dynamic characteristics of the permanent magnet mechanism during the closing process is calculated.AD⁃AMS is used to set up the dynamic simulation model of vacuum circuit breaker,and the dynamic calculation results of the permanent magnet mechanism are imported into ADAMS as the closing speed drive control to obtain the mo⁃tion characteristic of the contact by calculating the closing process of the circuti breaker.The influence of the clsing coil parameters,the pre⁃pressure of contact spring and the pre⁃pressure of opening spring on the contact dynamic characteristics of vacuum circuit breaker is analyzed.The calculation results show that the diameter of coil has a pos⁃itive increase relationship with the closing speed and the bounce time of contact,a negative relationship with the closing response time of the mechansim,and the pre⁃pressure of the opening spring has a positive relationship with the closing response time of the mechanism.The pre⁃pressure of contact spring has a significant negative impact on contact bounce time,but has little influence on contact closing speed and response time which can be neglected.