8.7/15kV12/20 kV / 18/30 kV / 26/35 kV
5min power-frequency withstand voltage test39 kV / 54 kV / 81 kV / 117 kV
Partial discharge test15 kV / 20 kV / 30 kV / 45 kV
Load cycle test in air22 kV / 30 kV / 45 kV / 65 kV
Impulse voltage test95 kV / 125 kV / 170 kV / 200 kV
Outdoor termination salt mist test11 kV, 1000h / 15kV, 1000h / 22.5kV, 1000h / 32.5kV, 1000h
Indoor termination dampness test11 kV, 300h / 15kV, 300h / 22.5kV, 300h / 32.5kV, 300h
Maximum allowable temperature during normal operation90℃ / 90℃ / 90℃ / 90℃
Maximum allowable temperature under short circuit250℃ / 250℃ / 250℃ / 250℃
1min power-frequency withstand voltage test4kV no flashover, no breakdown / 4kV/1min, no flashover, no breakdown / passed
Load cycle test (three cycles)5h heating, 3h cooling, conductor temperature 75℃ during heating / assessed by the following / passed
4h power-frequency withstand voltage test2.4kV no flashover, no breakdown / 2.4kV/4h, no flashover, no breakdown / passed