【摘要】 基于多体动力学原理,建立低压塑壳断路器操作机构的仿真模型,并通过试验验证模型的正确性。依据电场、磁场、斥力之间的关系,建立了低压断路器分断过程中电动斥力的数学模型,通过计算不同电流和触头转角下导电回路的洛仑兹力,应用二元三次插值技术分析电动斥力。并且通过ADAMS二次接口的自编程实现了电路方程、电磁场和机构运动方程的耦合求解。结果表明,由于电动斥力的作用,加快了断路器的分断,低压断路器在预期短路电流10kA下,机构的动作时间比空载时缩短了1ms。更多还原

【Abstract】 Based on multi-body dynamics,a novel simulation model of low-voltage molded case circuit breaker operating mechanisms is built,which is confirmed by experiments. To analyze the influence of the electrodynamic force on the breaking process of the circuit breaker,a mathematic model of electrodynamic force is built according to the relation between electric and magnetic field and repulsion force. After calculating the Lorenz force in different current values and contact rotating angles,the repulsion force in the whole breaking process of circuit breaker is analyzed by binary-cubic interpolatation technology. The circuit,electromagnetic and mechanical coupling equations are solved by self-programming routine of ADAMS secondary development. The results show that the electrodynamic force expedited the breaking process of circuit breaker. Under the condition of the anticipated short circuit current 10kA,the breaking time is shortened about 1 ms.更多还原