Analysis of Influence of Magnetic Field Distribution of HVDC Relays on Restriking

Arc restriking will increase the arc burning time, further ablate the contact, it seriously affect the breaking reliability and electrical endurance of the contact system. In this paper, based on the theory of magnetohydrodynamics (MHD), a two-dimensional mathematical model of arc plasma in HVDC relay is built by using COMSOL Multiphysics to analyze the arc reignition under different magnetic fields. The results show that the longitudinal magnetic field has little effect on the arc motion characteristics. Although increasing the magnetic flux density of the crossed magnetic field can reduce the arc stagnation time, when the magnetic flux density is greater than 35mT, the arc is easy to re ignite. The greater the magnetic flux density, the earlier the arc re ignites.