防止局扇发生事故保证其正常运转,是改善金属矿山井下劳动条件的重要措施,这在局扇实现自动运转以后,更加显得重要。局扇发生故障的原因很多,根据我矿多年来的统计,以单相运转烧毁电机为最多,每年烧坏电机达十几台至几十台。1964年,我矿曾全面推广了旁路继电器的保护方法。其 Prevention of accidents in the Bureau to ensure its normal operation is an important measure to improve the working conditions of metal mines downhole, which is more important when the fans are automatically operated. Bureau fan failure for many reasons, according to mine statistics over the years, with single-phase operation to burn the motor up to more than a dozen units burn each year to dozens of motors. In 1964, mine mine has comprehensively promoted the protection method of bypass relay. its