In computational process of very fast transient overvoltage, it is essential to find the exact model of the SF6-gas insulated switchgear. The arc model of disconnector is particularly important. In the paper, the segmental arc model, based on the distributed parameter theory and the physical process of arc, is proposed in comparison with the common arc model in the nowadays. Moreover combined with a 550kV station and utilized the FORTRAN and Matlab program, the VFTO is simulated in detail under the condition of varied arc models. It is indicated that the physical process of arc is modeled precisely by the segmental arc model, and the calculation of VFTO is used.
展开▼
