Dynamic arcing model of switching and its effect on VFTO

In computational process of very fast transient over-voltage, it is essential to find an accurate model of the gas insulated substation. The arcing model of disconnector is particularly important. The general arc-resistance model is not available to give better simulation for the changing of status during the development of arc. In the paper, based on the sical process of arc and the analysis of existing arc model: the exponential time-varying resistance and segmental arcing model, dynamic arcing model is proposed, which is divided into two stages before arc current zero and after arc current zero. Dynamic arcing model combine time-varying resistance and mayer model to describe the dynamic process of arc. Create the arc model blockset upon matlab/simulink software platform, calculating a 1100kV GIS internal VFTO on the condition of dynamic arcing model. At the same time, The VFTO is simulated in detail under the condition of varied arcing models, It is indicated that the sical process of arc is modeled precisely by the dynamic arcing model, and it is useful to improve the accuracy of VFTO simulation.