| Test sequence |
Item
|
Requirements acc. to IEC 60502.4 |
Remarks |
| 6.35/11(12)kV |
8.7/15(17.5)kV
|
12/20(24)kV |
IEC 60502.4
|
| 1 |
AC withstand voltage test (in air and ambient temperature) |
AC for 5 min. at 29kV.No breakdown, No flashover
|
AC for 5 min. at 39kV. No breakdown, No flashover |
AC for 5 min. at 54kV. No breakdown, No flashover |
PASS |
| 2 |
Partial discharge |
10pC max. at 11kV |
10pC max. at 15kV |
10pC max. at 20kV |
PASS |
| 3 |
Impulse withstand test |
10 impulses of each polarity at 75kV |
10 impulses of each polarity at 95kV |
10 impulses of each polarity at 125kV |
PASS |
| 4 |
Heating cycles in air |
30 cycles at 95℃--100℃ and 16kV in air, No breakdown, No flashover |
30 cycles at 95℃--100℃ and 22kV in air, No breakdown, No flashover |
30 cycles at 95℃--100℃ and 30kV in air, No breakdown, No flashover |
PASS |
| 5 |
Heating cycles under water |
30 cycles at 95℃--100℃ and 16kV under water, No breakdown, No flashover |
30 cycles at 95℃--100℃ and 22kV under water, No breakdown, No flashover |
30 cycles at 95℃--100℃ and 30kV under water, No breakdown, No flashover |
PASS |
| 6 |
Partial discharge at 95℃--100℃ |
10pC max. at 11kV |
10pC max. at 15kV |
10pC max. at 20kV |
PASS |
| 7 |
Thermal short-circuit (screen) |
No visible deterioration at 3.0 kA, 1s |
No visible deterioration at 3.0 kA, 1s |
No visible deterioration at 3.0 kA, 1s |
PASS |
| 8 |
Thermal short-circuit (conductor) |
No visible deterioration at 23.0 kA, 2s |
No visible deterioration at 23.0 kA, 2s |
No visible deterioration at 23.0 kA, 2s |
PASS |
| 9 |
Dynamic short-circuit |
No visible deterioration at 81.0 kA, not less than 10 ms |
No visible deterioration at 81.0 kA, not less than 10 ms |
No visible deterioration at 81.0 kA, not less than 10 ms |
PASS |
| 10 |
Impulse withstand test at 95℃--100℃ |
10 impulses of each polarity at 95kV |
10 impulses of each polarity at 95kV |
10 impulses of each polarity at 125kV |
PASS |
| 11 |
AC withstand voltage test |
AC for 15 min. at 16kV. No breakdown, No flashover |
AC for 15 min. at 22kV. No breakdown, No flashover |
AC for 15 min. at 30kV. No breakdown, No flashover |
PASS |