Tóm tắt:

phase ỉeakage to the groundin the mine grid is the most unexpected type of tault, chapscterized by high levels oíọdanger for people and eỉectriqạỊ equipmsnt át the mines. Ọne of the most effective solutions to prevent the risk of electric shock and,ị equipment damage is to be equipped with single phase earth-ieakage protection devices. This paper presents the theoretical basis for the creation of ao single phase leakage protection devíce basefl on the logicaỉ principle of comparision of the current’ direction betvveen the power supply line faí!ing to the ground and all the others in the mirte network of 6-10 kV.