煤矿井下刮板输送机、皮带输送机、空气压缩机的负载经常变化,平均负载偏低,“大马拉小车”的情况比较严重。与此同时,功率因数也在经常变化,采区负载的功率因数在0.3～0.6之间。但异步电动机的无功功率基本不变,几乎是一个定值。异步电动机的无功功率由本身结构特性所决定:铁芯大、磁间隙大的,无功功率大。在这个基础上选择补偿电容器的容 Coal mine scraper conveyor, belt conveyor, air compressor load often changes, the average load is low, “big horse car” is more serious. At the same time, the power factor is also changing frequently, the power factor of the mining area load is between 0.3 ~ 0.6. However, the reactive power of asynchronous motor basically unchanged, almost a fixed value. Induction motor reactive power by its own structural characteristics of the decision: core, magnetic gap, reactive power. On this basis, select the compensation capacitor capacity