Omokeeva

 Currently, operation experience of vacuum and gas-insulated circuit breakers substituting oil ones in the  chain "generator - transformer" is not enough. Therefore, in each case, installation of switches of a new generation requires an analysis of the switching processes. For conducting a research, mathematical models of the block scheme for low power hydro-plants and switches of various types among EMTP-RV were created. The authors estimated the levels of overvoltage occurring in switching by power-producing switches for various combinations of parameters of the main equipment unit; they analyzed the influence of parameters and places of installation of overvoltage protection. The main provisions of the research can be used by design organizations for reconstruction of low-power hydro-plants; in preparation of instructions for use of overvoltage protection when overvoltage is caused by commutation of vacuum switches in circuits of power-producing stations.