The Simulation Study of VFTO in the 550 kV GIS System

This essay discusses about the influence of different ways of tripping and reclosing on VFTO in a 550 kV GIS system by means of EMTP.According to the results,the situation of overvoltage is more serious in tripping than in reclosing.The amplitude of VFTO is maximum near the console switch.The amplitude of overvoltage on the main transformer is less than 1.3 p.u,which has weaker influence on the major insulation.However,the cumulation of it may cause great harm.