Experimental research of efficiency of cascade substations' Lightning protection

Experimental research results of lightning protection schemes at inoperative circuit area 110 kV have been showed in this work. The experiments have been carried out during pulses generation up to 40 kV with protective devices modeling, overhead transmission line insulation "direct" flashovers and "back" flashovers. The results have shown high efficiency of cascade substations lightning protection even under application of III group valve dischargers at transmission line approach. Experiments in operative circuit allow taking information about overvoltages development, which rationally can be used under mathematical models' validity control.