Therefore, over-voltage is the key and decisive factor of insulation in 750KV & UHV power network.
因此，过电压是750kV及特高压输电技术的关键问题，也是750kV及特高压输电线设计的决定性因素。
2
The test results show that the power frequency voltage withstanding characteristics of the insulation of protective relays are the key factor influencing tolerable ground potential rise.