局扇是煤矿掘进工作的主要通风设备,能否保持局扇正常运转,对确保掘进供风、安全生产起着重要的作用。我矿已往由于对局扇管理不善,经常发生烧毁电机线包,直接影响了掘进任务。仅就1973年统计就烧毁局扇19台,每修一台费用600元,给国家造成损失很大。于是我们在学习京西矿务局的局扇单相保护的基础 The bureau fan is the main ventilation equipment for coal mining work. Whether the fan can keep the normal operation of the fan can play an important role in ensuring ventilation and safety in tunneling. In the past, due to poor management of the fans in the mine, the motor coil often burned, directly affecting the heading task. Only on the statistics of 1973 burned bureau fans 19, each repair a cost 600 yuan, causing great losses to the country. So we are studying the basis of fan-phase protection of Jingxi Mining Bureau