Simulation of Arc Based on Mayr-Cassie Model under Restrike Overvoltage

Arc simulation under overvoltage in switchgear has great significance to its design and retrofit. This article simulated the thyristor switched capacitor in transformer substation by EMTDC/PSCAD, in which, different way of restrike was considered and overvoltage waveform was obtained. The arc model based on Mayr-Cassie model is estab- lished in MATLAB/Simlink. Through the simulation of different way of overvoltage, the voltage curve, current curve of arc is obtained. The simultaneous result shows: the model could reflect the external character of arc restrike under overvoltage.