山西省稷山县下柏、邢堡等几个大队经反复试验,研究出几种自动掉闸装置,用以保护电动机等。现介绍如下,供参考。一、双闸保护选择一个能适应电动机起动电流的三相闸(称起动闸)和能适应正常运行电流的三相闸(称运转闸),使两闸并联(图1)。工作时,先合起动闸,电机便启动 Jishan County, Shanxi Province, next Park, Xing Fort and several brigade after repeated tests to study several automatic gate device to protect the motor. Now introduced as follows for reference. First, the double brake protection Select a three-phase brake (called the brake) that can adapt to the motor starting current and three-phase brake (call the brake) that can adapt to the normal operating current, so that the two gates in parallel (Figure 1). Work, the first joint brake, the motor will start