It is necessary to use two-stage selective earthing protective device in the power supply system of open-pits.

露天矿供电系统中采用两级选择性接地保护装置十分必要。

youdao

It is necessary to use two-stage selective earthing protective device in the power supply system of open-pits.

露天矿供电系统中采用两级选择性接地保护装置十分必要。

youdao