Simulation Study of Arc Characteristics During the Breaking Process of Molded Case Circuit Breaker

With the development and promotion of arc theory and computer technology, arc simulation technology has become an important reference for product development and performance evaluation. Based on the theory of magnetohydrodynamics, an actual molded case circuit breaker model was simulated and studied. Considering the complex multi-physical field coupling characteristics of air arc plasma, ANSYS is used to calculate electromagnetic field, FLUENT to calculate air flow field and thermal field, and the interface program is used to realize data transfer and exchange during the solution process. The analysis of the arc motion during the simulation shows that the grid structure and its spatial distribution affect the arc voltage and the performance of the circuit breaker.