Test itemStandard requirements
1 min outdoor termination rain power-frequency voltage test4.0U0, no flashover, no breakdown
5 min power-frequency withstand voltage test4.5U0, no flashover, no breakdown
Partial discharge testdischarge magnitude not greater than 10pC at 1.73U0
Constant-voltage load cycle voltage test (in air)2.5U0, conductor heated to (95-100)°C, each cycle 8h, heating 5h, cooling 3h, total 60 cycles
Lightning impulse voltage test95, 150, 170, 200kV, 10 times each of positive and negative polarity, no flashover, no breakdown
15 min AC withstand voltage test2.5U0, no flashover, no breakdown
Outdoor termination salt fog test1.25U0, 1000h, no flashover, no breakdown
Indoor termination damp test1.25U0, 300h, no flashover, no breakdown