【摘要】 应用虚拟样机技术,建立了低压塑壳断路器MCCB操作机构运动特性的仿真模型,并用实验验证了模型的正确性。采用三维有限元分析计算出电动斥力与电流和触头开距之间的定量关系,然后通过对ADAMS的二次开发,耦合电路、电磁场和机械运动方程,考虑电动斥力的作用,分析了预期短路电流、机构开始动作时间以及气动斥力对于MCCB三相短路开断过程的影响。结果表明,提出的方法对于MCCB的分析、设计及优化是有效的。更多还原

【Abstract】 A set of differential equations describes the coupling of electric circuit, electromagnetic field and mechanism system of molded case circuit breaker (MCCB) . With virtual prototyping technology, the simulation model for the operation mechanism of MCCB can be built, and experiments have verified the model. With 3-D finite element analysis, the electrodynamic repulsion force varied with the current and contact gap can be calculated. Then, with the existence of electro-dynamic repulsion force, the 3-phase short circuit interruption process of the MCCB has been investigated with the influence of prospective current, mechanism starting motion time and blow open force. It demonstrates the proposed method is effective and is capable of evaluating new design of MCCB products.更多还原