Basic provisions for leakage protection

First, to prevent personal electric shock;

Second, continuously monitor the insulation status of the low-voltage power grid in the underground mining area, so as to take timely measures to prevent further deterioration of its insulation;

Third, reduce the risk of leakage current caused by gas, coal dust explosion. Prevent leakage current from detonating the electric detonator;

4. Prevent the arc generated by the short-circuit current from burning through the outer casing of the explosion-proof electrical equipment, or increase the temperature of the outer casing beyond dangerous values, causing gas and coal dust explosion; preventing phase-to-phase short-circuit faults caused by leakage of cables and electrical equipment. ;

5. The use of selective leakage protection device will shorten the power failure range of leakage, and it is easy to find leakage faults and eliminate them in time, thus shortening the leakage and power failure time.