1978年1月,在石泉水电厂2号机组大修期间,对永磁机进行了吊转子检查。由于永磁发电机的永久磁钢处于磁开路状态达两个多小时,造成永磁机永久磁钢严重退磁,永磁机输出电压(见表1)大大低于额定电压,使水轮发电机组的安全运行受到影响。为此,必须对永磁发电机进行充磁处理。 In January 1978, during the overhaul of Unit 2 of Shiquan Hydropower Plant, a hanging rotor inspection of the permanent magnet machine was carried out. Permanent magnet permanent magnet generator in the state of magnetic open circuit for more than two hours, resulting in permanent magnet permanent magnet machine serious demagnetization, permanent magnet machine output voltage (see Table 1) is much lower than the rated voltage so that the hydro-generator The safe operation is affected. For this reason, the permanent magnet generator must be magnetized.