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In the mine protection of high voltage power grid, quick and accurate detection of network parameters and power quality parameters is significant for the reliability, security and continuity of the power supply system. Fast AC sampling algorithm with low computational complexity and high precision can obtain a variety of electrical parameters accurately, to guarantee real-time system monitoring and protection. In this paper, in-depth study on short-circuit protection and overload protection works of the mine high voltage power grid is undertaken, the advantages and disadvantages of Fourier algorithm and root mean square (RMS) algorithm in AC sampling algorithm as well as the application conditions are analyzed. On this basis, a fast Fourier AC sampling algorithm applied to mine high voltage grid parameters detection is proposed, and the algorithm is analyzed; at the same time, hardware circuit of mine high voltage power protection system and related software are designed based on Fast Fourier AC sampling algorithm, and the system is verified by experiments. Experimental results show that the system based on fast Fourier AC sampling algorithm is stable, and network parameter detection is accurate, with certain application value.

Realization of Fast Fourier AC Sampling Algorithm Applied to Mine High Voltage Grid Parameter Detection