我矿井下使用的局扇,都是无人监护运行的,经常由于一相熔丝熔断,电机长时间单相运行而烧坏,不但因设备损坏而增加修复费用,更严重的是因中断了矿井通风而威胁工人的安全健康。局扇发生单相运行的多数原因是:熔丝及开关接触不好,熔丝不合规格,或熔丝在井下潮湿空气中氧化、腐蚀和变质,以致在电机正常运转(或启 I use the bureau in the mine Fan, are unmanaged operation, often due to a fuse blown, the motor is burned out of single-phase operation for a long time, not only because of equipment damage and increase the cost of repair, more serious is interrupted Ventilation of the mine threatens workers’ safety and health. The most common reasons for the single-phase operation of the fan are: poor contact of the fuse and the switch, unacceptable fuses, or oxidation, corrosion and deterioration of the fuse in the moist air downhole, so that when the motor runs normally