小孙是蓝天公司的电气工程师,多年来从事电子设备的维修工作。近几年来,各种设备里应用的变频器越来越多,小孙被安排来专门从事变频器的调试和维护。这一天,小孙从仓库里领出了一台变频器,打算配用到鼓风机上。按照规定,先通电测试一下。谁知一通电,就发现冒烟,立刻切断了电源。把盖打开后,发现有一个电阻很烫。小孙想, Xiao Sun is the blue sky company’s electrical engineer, for many years engaged in the maintenance of electronic equipment. In recent years, a variety of devices used in more and more frequency converter, Xiao Sun was arranged to specialize in the commissioning and maintenance of the inverter. On this day, Koshin leading a converter from the warehouse, intended to be used with the blower. In accordance with the provisions of the first electricity test. Who knows a power, found smoke, immediately cut off the power. Open the lid and found that there is a very hot resistance. Xiao Sun think,