Abstract:In view of the fact that the commonly used arc model cannot simulate the entire process of a single arc discharge, which affects the calculation and simulation of very fast transient overvoltage (VFTO), a single arc breakdown model is proposed. Arc reignition is a practical case that must be considered in the study of arc, so a new arc reignition model is designed based on the joint arc reignition criterion based on the single arc breakdown model. The whole process of a single arc discharge consists of three stages: prebreakdown, steady state combustion and arc extinguishing. The single arc breakdown model comprehensively considers the three stages, and the corresponding models to simulate the corresponding arc states are built in each stage. The transition of the three stages is completed by tracking the arc current. At present, the arc model only considers a single breakdown, but ignores the influence of reignition, so the arc process cannot be accurately simulated. The arc reignition model can accurately simulate the actual state of the arc. The applicability of single arc breakdown model is verified by simulation, and it can be found that the waveform of VFTO in the arc reburning model is significantly different from that in the single arc breakdown model.