不明原因工频闪络
unidentified power frequency flashover
工频X射线摄影机
Mains frequency radiographic equipment
工频X线机
industrial frequency X-ray unit
工频变化量距离保护
power frequency variation distance protection
工频变化量距离继电器
incremental power frequency distance relay
工频变化量元件
Power frequency variety element
工频调制
Industry frequency modulation
工频分流系数
working frequency current division factor
工频分压特性试验
power frequency voltage distribution characteristics test
工频接地电阻
frequency grounding resistance
工频接地电阻值
power frequency grounding resistance value
工频接地干扰
grounding power frequency interference
工频炉
Frequency induction furnace