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Abstract In order to meet the requirements of underground power supply system operation, two transformer operation modes of substation and power supply of different underground equipment, double power switching was applied in underground central substation incoming line, ground substation 6 kV system bus, ground wind machine room incoming line in Malan Mine, quick switching scheme of dual power supply in underground power supply system was studied. The practice showed that double power switching enabled to reduce the power cut of working face and ventilation system caused by single circuit loss.
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