Optimization Analysis of Underground 6 kV Grid Structure

For the disadvantages of coal mine high voltage grid multi-level power supply way, the paper proposed a reliable simple power supply structure for mine 6 kV power structure. The optimized grid structure is three level main type power supply. This method can solve technical problems of multi-level longitudinal grid over-current and leakage protection setting difficult,eliminate the long-standing problems of override trip for coal mine high-voltage power grid.