Design of selective leakage protector for underground power grid in coal mine
Based on the safety problem of underground coal mine leakage,combined with the demand of domestic electric shock and leakage protection system construction,a selective leakage protection device for underground coal mine power grid is studied and designed.This design is successfully based on the theory of directional selective leakage protection principle of zero-sequence current,and takes MSP430F149 as the control center.By measuring the zero-sequence current and zero-sequence voltage of the fault branch of the three-phase power grid,and comparing its amplitude and phase relationship,it can accurately determine the branch where leakage occurs and realize accurate selective leakage protection function,which has a certain positive significance to improve the safety of underground leakage in coal mines.
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