一、失磁保护的简单原理同步发电机在运行中由于励磁回路的故障,发生励磁消失或低励磁运行时,将使发电机有可能失步,并从系统吸取大量的无功功率,使母线电压急剧下降、发电机定子端部及转子表面局部过热、机组产生振荡。大型机组在失去励磁后,还可能引起系统的电 First, the simple principle of loss of magnetic protection Synchronous generator in operation due to fault excitation circuit, the excitation disappears or low excitation operation, the generator may be out of step, and draw a lot of reactive power from the system, so that the bus The voltage drops sharply, the stator stator end and the rotor surface overheat, the unit produces oscillation. Large units in the loss of excitation, but also may cause the system power