Simulation and comparison are made on the variations of all the electric parameters when the failures of the excitation - loss and the three - phase short - circuit at the side of generator - transformer occur ; in which the dynamic process of the excitation - loss is deeply studied and then a excitation - loss protection plan more suitable for generator concerned is put forward herein as well 文中通过对发电机发生失磁故障及发电机变压器侧发生三相短路故障时各电气量的变化进行仿真、比较，深入研究了失磁的动态过程，提出了一种更合适的发电机失磁保护方案。
