电动机保护中,以熔断器保护方法最为简单。但为了满足起动要求,熔断器容量需选择在额定电流的二点五倍,这样,对电动机运行中的过负荷就不能起到保护作用。轿子山煤矿采用改装现用刀闸,安设两组熔断器的方法对电动机进行保护。将刀闸改成能上投和下投,并分别按起动电流值和额定电流值安装两组熔断器。起动时投上闸,通过起动电流熔断器接通电动机电路,起动后,改合下闸,通过额定电流熔断器接 Motor protection, the fuse protection method is the simplest. However, in order to meet the starting requirements, the fuse capacity should be selected at a rated current of 2.5 times, so that the motor overload can not play a protective role. Jiaozishan Coal Mine converted using the current knife gate, set up two groups of fuses to protect the motor. The knife switch can be cast and cast under the vote, respectively, according to the starting current value and rated current value to install two sets of fuses. Switch on the brake when it is started, turn on the motor circuit by starting the current fuse, after starting, change the brake, change the current through the fuse