50%闪络电压梯度
50% flashover voltage gradient
表面闪络放电
surface flashover discharge
不明原因工频闪络
unidentified power frequency flashover
冲击高压闪络法
impulse HV flashover method
冲击闪络电压
impulse flashover voltage
impulse discharge voltage
电网闪络
electrical network flashing
断口闪络保护
fracture flashover protection
breakage flashover protection