Research on Combined Gap of Live Line Work for 750 kV Power Transmission Line

The switching impulse spark-over characteristics of side phase on suspension tower, middle phase on cup tower and combined gap of live line work on link strain insulators for 750 kV transmission line have been got through the testing, based on which, the calculation and analysis of dangerous rate for live line work are carried out, and combined gap for 750 kV live line work has been determined.