Electric Arcs in Switching Devices
Switching arcs can be modeled using ANSYS EMAG to solve the magnetic field problem and Fluent to solve the fluid dynamics problem – coupled in volume through MpCCI CouplingEnvironment. Based on magneto-hydrodynamic (MHD) equations, a 3D model for a switching arc considering Lorentz forces, Ohmic heating, and radiation transport can be developed using a co-simulation approach.
Beside the co-simulation solution, which allows to subdivide a complex problem in smaller problems, the challenge still remains in modelling the plasma. The modelling of the electric arc behavior is governed by different stages, e.g. the arc motion, the arc elongation, the arc commutation, and arc cutting process. The inclusion of all these phenomena in the analysis requires to consider additional models like the arc root, the material erosion, etc. The resulting physical and material model of the electric arc provides methods and references for the optimization work of switching devices (MpCCI ArcLib).