Test itemStandard requirement
1min outdoor termination rain test at power frequency voltage48kV, no flashover, no breakdown
5min power frequency withstand voltage test54kV, no flashover, no breakdown
Partial discharge testdischarge magnitude not greater than 10pC at 20kV
Constant voltage load cycle test (in air)30kV, conductor heated to (95-100)°C, each cycle is 8h, including 5h heating and 3h cooling, total 60 cycles
Lightning impulse voltage test125kV, 10 times each of positive and negative polarity, no flashover, no breakdown
15min AC withstand voltage test30kV, no flashover, no breakdown
Outdoor termination salt spray test15kV, 1000h, no flashover, no breakdown
Indoor termination moisture test15kV, 300h, no flashover, no breakdown