Effect of electric arc resistance on the transition state due to the breakers switching in substations with air insulation

Switching operations in power plants and power substations is done due to different factors, like synchrotron or cutting of generators. This operation results into the formation of various volume of high excess frequency voltage and as a consequence, occurrence of fault in the function of the power system installations. In this paper, switching voltage excess due to connecting and disconnecting of breakers switches in substations with air insulation has been studied and an appropriate computer model been presented for the simulation of the transition events from switching in substation with air insulation. As these switches cut off, an arch is appeared between breaker connectors, we will study the resistance effect of this electric arch on the limit of transition voltages. ATEP-EMTP software has been employed for simulation and analysis.