灯泡贯流式水轮发电机转子采用悬臂式结构，整个机组安装在水里，机组转速低，磁极对数多，励磁回路发生接地的故障机率较大，而产生的后果严重。
The rotor of bulb tubular hydro generating unit adopts cantilever structure. The whole machine was installed under water with low rotation speed and more magnetic poles.
“发电厂并网运行安全性评价”要求验证低磁励限制与失磁保护的整定关系，在实际校核中，发现低磁励限制是在P-Q平面进行计算的，而阻抗型失磁保护是在R-X阻抗圆平面进行分析的。
Through check, it is found that minimum excitation limit is calculated in P-Q plane, while impedance type loss-of-field protection is analyzed in R-X plane.
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