低压电器中关键参数仿真设计的研究

Research on Simulation of the Key Parameters in Low Voltage Circuit Breaker

总结了低压电器产品设计中的关键参数。针对低压电器中的稳态发热特性、短时大电流情况下动热稳定性、脱扣系统动力学特性以及灭弧特性,分别详细介绍了目前可以实现的仿真方法。前三者所采用的方法包括基于有限元分析的热电耦合、电磁耦合、热电磁耦合、热结构耦合等多种不同种类的耦合场计算。针对灭弧特性采用了基于有限体积法的磁流体动力学计算,并展示了对应的仿真计算结果。通过对关键参数设计方法的总结,展示了目前为止可以实现的整套低压电器设计的方法,为低压电器产品的研发、设计以及产品优化提供了全面的理论体系。

The key parameters in the design of the low voltage circuit breakers were summarized. The simulation methods for the temperature rise at steady-state, the dynamic thermal stability during the short term high current, the dynamics characteristics system and the arcing characteristics in the arc chamber were introduced. The methods for the first three properties were realized by the finite element method based on the thermo-electrical- magnetic coupling and the thermo-structure coupling. As to the simulation of the arc behavior, the magneto-hydro- dynamics based on the finite volume method was adopted. By this summary, the feasible whole simulation system in the low-voltage circuit breaker was presented, which provided the complete theory for the development and optimization of the practical products.