Study on the Impact of Overvoltage Generated by the Operation of 110kV GIS Switch on the System

VFTO caused by the switch operation of GIS seriously threatens the safety of electric power system operation. In order to find out the causes of VFTO, this paper decides related parameters, establishes a simulation model with ATP-EMTP software, and analyzes the VFTO of all nodes inside GIS in case of different types of switch operation, by aiming at a certain 110kV GIS. The research results indicate that the switching-off operation may generate greater amplitude of VFTO than switching-on operation, disconnector operation may generate far greater amplitude of VFTO than any other ways of operation do, the switch of bus may generate high VFTO, the VFTO amplitude at the operated switch and bus end is far higher than that of other nodes, which may reach 2.382 p.u at the maximum.