Simulation of arc discharge modes in vacuum chamber

An interconnection between contact erosion and arc discharge formation was discovered. These results are explained by a mathematical model. The model describes a current density distribution in the arc contact system and takes into account the thermal processes in the intercontact gap. An electrical field instead of a magnetic field determines the formation of the arc mode to a greater degree. Simulations of processes occurring in the arc for some versions of contact system design have been carried out. Their defects and advantages are considered. The best design criterion is provided by a current-carrying electrode system where the conditions of arc motion, during action of the discharge on the electrode system, are minimized. These conditions are existent when the electric field intensity maximum is placed at the outside of the gap.