Test itemStandard requirements
1-minute outdoor termination rain test at power frequency voltage35 kV, no flashover, no breakdown
5-minute power frequency withstand voltage test39 kV, no flashover, no breakdown
Partial discharge testdischarge magnitude not greater than 10 pC at 15 kV
Constant voltage load cycle voltage test (in air)23 kV, conductor heated to (95-100) °C, each cycle 8 h (5 h heating, 3 h cooling), total 60 cycles
Lightning impulse voltage test95 kV, 10 times each of positive and negative polarity, no flashover, no breakdown
15-minute AC withstand voltage test23 kV, no flashover, no breakdown
Outdoor termination salt mist test11 kV, 1000 h, no flashover, no breakdown
Indoor termination damp test11 kV, 300 h, no flashover, no breakdown