Rated voltage UO/U (Um) kV |
6/10(12.5) |
8.7/15(17.5) |
26/35(40.5) |
Railway Uo=27.5 |
Test result |
5min frequency voltage test |
no flashover, without breakdown under 4.5Uo |
no flashover, without breakdown |
1min frequency voltage under rain test |
no flashover, without breakdown under 4Uo |
no flashover, without breakdown |
Partial discharge at room temperature test |
discharge volume under 1.73Uo ≤10PC |
≤1.6pC |
Constant voltage load cycle in the air test |
heated 2.5Uo and conductor to a temperature to 95-100°C three times, no flashover, without breakdown |
no flashover, without breakdown |
Partial discharge at high temperature test |
heated cable conductor to 95-100°C, discharge volume under 1.73Uo ≤10PC |
≤1.6pC |
Partial discharge at room temperature test |
discharge volume under 1.73Uo ≤10PC |
≤1.6pC |
Impulse voltage at high temperature test |
75kV |
95kV |
200kV |
25kV |
no flashover, without breakdown |
heated cable conductor to 95-100°C,both positive and negative polarity 10 times, no flashover, without breakdown |
Constant voltage load cycle test |
heated 2.5Uo and conductor to a temperature to 95-100°C sixty times, no flashover, without breakdown |
no flashover, without breakdown |
Partial discharge at high temperature test |
heated cable conductor to 95-100°C, discharge volume under 1.73Uo ≤10PC |
≤1.6pC |
Partial discharge at room temperature test |
discharge volume under 1.73Uo ≤10PC |
≤1.6pC |
Impulse voltage test |
75kV |
95kV |
200kV |
250kV |
no flashover, without breakdown |
both positive and negative polarity 10 times, no flashover, without breakdown |
15min frequency voltage test |
no flashover, without breakdown under 2.5Uo |
no flashover, without breakdown |
Outdoor termination salt spray test |
1.25Uo,1000h, no flashover, without breakdown, no significant electrical corrosion and mechanical damage |
no flashover, without breakdown |
Indoor termination wet test |
1.25Uo, 300h, no flashover, without breakdown, no significant electrical corrosion and mechanical damage |
no flashover, without breakdown |