发电机试验站灭磁保护方法的研究与实践

Research and Practice of De-excitation Protection of Generator Test Station

灭磁系统是发电机励磁系统的重要保护设施,是发电机内部短路故障时减小损失的唯一方法。在试验站励磁系统中,灭磁系统要求必须快速可靠,这样才能在各种事故中保护励磁线圈和整流装置。在该系统中,采用逆变灭磁,强制灭磁和自动灭磁几个级别,分别用继电器,PLC控制的组合方式来应对几个需要灭磁的特殊情况,提高了灭磁保护的可靠性,对灭磁开关的触点也有比较好的保护。在发电机型式试验站的实际使用中,效果良好。

De-excitation system is the important protection facility of generator excitation system , is the only method to reduce losses of generator internal fanlt. In the excitation system, de-excitation system is required fast and reliably, it can protect the excitation coil and rectifier device in a variety of accidents. In de-excitation system, the inverter de-excitation, forced de-excitation and automatic de-excitation several levels were used, combination of relay and PLC control was used to deal with several special cases of de-excitation. The reliability of de-excitation protection is improved, the magnetic switch contact is also quite good protected. In the actual use of generator test station, results are good.