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在矿山的生产过程中,有不少中、小型低压电动机,经常是无人看管的,如局扇、水泵等,往往由于熔丝熔断一相,电缆被砸或烧断一相,磁力起动器或接触器一相接触不良等多方面的因素,造成电机单相运转,烧毁电机。就我矿而言,因单相运转烧毁的电机,约占整个损坏总数的75％以上。为了解决这个问题,我们参考有关资料,作了一些工作,现将我们运用比较成熟的两种低压电机单相运转保护方案介绍如下:
In the mine production process, there are many medium and small low-voltage motors, often unattended, such as bureau fans, pumps, etc., often due to the fuse fuse one phase, the cable is smashed or blown one phase, the magnetic starter Or contact with a bad contact and many other factors, resulting in single-phase motor operation, burning motor. In mine, the motors burned by single-phase operation account for more than 75% of the total damage. In order to solve this problem, we refer to the relevant information, made some work, now we use the more mature two kinds of low-voltage motors single phase operation protection scheme is as follows: