The paper set forth the reasons and phenomenon that three phase asynchronous motor run on the condition of open phase in the coal preparation plant.And some protective methods were given when turning out open phase.For old coal mine or facture building,the protective methods was given,the methods were simple,convenient and easy and getting better result.%文章针对选煤厂三相异步电动机缺相运行产生的原因、现象进行阐述,列举了缺相故障的几种常见保护措施。同时针对运行较早矿区或厂房等,提出了一种简单的保护方法,该方法设计简单、方便易行,在生产中取得了较好的效果。
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