The article is devoted to the analysis of emergency situations related to the damage of gas-insulated switches on ultrahigh-voltage lines. The results of mathematical modeling of aperiodic oscillatory process produced in the Simulink system, which occurs when a high-voltage power line containing shunt reactors is switched on under the nominal voltage, are presented. The variants of using a switch with a set of pre-switched resistors in order to minimize the destructive influence of the aperiodic process that occurs when an overvoltage pulse occurs are considered. The results of the simulation of the switching process in the application of high-voltage switches with a set of pre-switched resistors. The simulation was performed on the parameters of the current transmission line with a nominal voltage of 500 kV on the site of the substation "Eletskaya" - nuclear power plant "Donskaya".

Keywords: shunt reactor, aperiodic process, high-voltage power lines