Comparative analysis of 3-D magnetic field for axial magnetic field vacuum interrupter contact with different iron core structure
The vacuum interrupter(VI) is the core of vacuum circuit breakers and the design of contact structure plays a vital role in improving vacuum switch current breaking capability. In this paper, a three-dimensional model of cup-shaped axial magnetic contact with core structure has been established. And the effects of different slotted depth and angle on axial magnetic field(AMF) distribution of arc center plane at current peak / zero and average phase shift time distribution has been simulated and analyzed by COMSOL multi-physics coupling simulation software based finite element method. The results show that the center magnetic field is weaken and the edge magnetic field is increased due to adding ring iron core. And axial magnetic flux density, residual magnetic flux density and magnetic field phase shift time are all decreased with the slotted depth and angle increasing.