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The domestic application of high-voltage electrical in coal mine systems is still very small, especially for 6kV fans, hoisting winches and water pumps. High-voltage electrical is almost not used. They are all fixed equipment, and the motor power is large, reaching more than 300kW. Huge power saving potential can be tapped. Even if other means are used to carry out energy-saving technological transformation, the effect of using high-voltage electrical is not the best, and high-voltage electric motors in coal mines have not been widely used so far. The reasons for this situation are: first, the withstand voltage of power electronic devices is not high (generally only 1.2kV), and corresponding high-voltage electrical products have not been launched in China; second, the reliability is not too high. These continuously operating equipment in coal mines must have high security.

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