| Test item |
8.7/15(17.5)kV |
12/20(24)kV |
26/35(42)kV |
| A.C. voltage withstand test |
No flashover, no breakdown at 39kV for 5min. |
No flashover, no breakdown at 54kV for 5min. |
No flashover, no breakdown at 117kV for 5min. |
| Partial discharge test |
15kV, <2pC |
20kV, <2pC |
45kV, <2pC |
| Heating cycles voltage test |
63 cycles at 95-100°C, 23kV |
63 cycles at 95-100°C, 30kV |
63 cycles at 95-100°C, 65kV |
| Impulse voltage withstand test at 95- 100°C |
No flashover, no breakdown at 10 positive and 10 negative impulses at 95kV |
No flashover, no breakdown at 10 positive and 10 negative impulses at 125kV |
No flashover, no breakdown at 10 positive and 10 negative impulses at 200kV |
| Thermal short-circuit test |
No deformation or welding at 31.0kA,2.02s and 31.1kA,2.02s |
No deformation or welding at 31.0kA,2.03s and 31.0kA,2.02s |
No deformation or welding at 31.0kA,2.03s and 30.8kA,2.04s |
| Dynamic short-circuit test |
No deformation or welding at 112.3kA,60ms |
No deformation or welding at 111.3kA,60ms |
No deformation or welding at 112.2kA,60ms |
| 15min, A.C. voltage withstanding test |
23kV, 15min. no flashover, no breakdown |
30kV, 15min. no flashover, no breakdown |
65kV, 15min.no flashover, no breakdown |
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