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某年12月,正值冬季锅炉运行供热时节,我厂锅炉房2号4t锅炉的40kW引风电机发生起动不了的故障。经现场寻查,发现该引风电机通过自耦减压起动器进行降压起动时声音异常,温升较高,在风门关闭的情况下无法带动引风机运转。将电机接线盒打开,拆下接线螺钉,将三根相线与电机绕组的连接脱开。用万用表检测三根相线,无短路、接地问题;测量三根相线电压,在起动过程中约250V,在35s之后(即起动结束进入正常运行时)为380V,而且三相电压基本平衡。接着使用万用表及绝缘电阻表(即
A certain year in December, coincided with the winter heating boiler running season, I boiler plant No. 4 4t boiler 40kW induced draft motor can not start the fault. After field investigation, it was found that the induced draft motor through the autoclave decompression starter for abnormal starting when the sound pressure, temperature rise is high, the damper can not be driven in the case of closure of the induced draft fan. Open the motor terminal box, remove the terminal screws, and disconnect the three phase wires from the motor windings. Use multimeter to detect three phase, no short circuit, ground problem; measure the three phase voltage, about 250V in the starting process, after 35s (that is, the start of the end into normal operation) is 380V, and three-phase voltage is basically balanced. Then use a multimeter and insulation resistance meter (ie