某农村小型水电站一台带直流励磁机的老式发电机,在停机后再次开机不能建压。一般这类经几十年运行的带直流励磁机的发电机,停机后再次开机不能建压,多数是励磁系统发生了故障。所以,我们首先对这台发电机的励磁回路进行认真检查,果然在发电机励磁回路中发现了断线,将断线故障 A rural small hydropower station with a DC excitation of the old generator, the machine can not start again after the shutdown pressure. In general, this type of generator with DC exciter which has been operated for several decades can not build pressure after it is switched on again, and most of the faults occur in the excitation system. Therefore, we first carefully examine the excitation circuit of this generator, and sure enough, we found a broken wire in the excitation circuit of the generator,