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在某啤酒厂制冷车间的电气安装中,出一台配电屏控制的三台水泵的电气安装已经完毕,电气线路已配好接好,电机已空载试运转一切正常。电气安装人员在配电屏内切断电源,并上了锁,准备以后带负荷运行。就在断电待运行当中,出现了意想不到的事故,由该配电屏控制的三台水泵中有两台水泵的电源线和电机接线盒的端子被烧坏,配电屏内也有烧的痕迹。经检查分析,
In the electrical installation of a brewer’s refrigeration plant, the electrical installation of three water pumps controlled by a power distribution screen has been completed, the electrical lines have been properly connected, and the motors have been tested for no-load operation. The electrical installer cuts off the power supply in the power distribution panel and locks it up for operation with load. In the middle of a power outage, an unexpected accident occurred. The power lines of the two pumps and the terminals of the motor terminal box in the three pumps controlled by the power distribution screen were burned out, and the power distribution screen was burned. trace. After inspection and analysis,