欠励限制与失磁保护的配合计算

Coordination calculation of underexcitation limitation and field failure protection

发电厂应对欠励限制保护与失磁保护的定值进行核算,确认两者是否配合。因失励限制保护与失磁保护原理不同,需将两者归化至同一平面才能进行比较。介绍了失磁保护阻抗圆转换为功率圆的方法,通过实例计算和实验验证了该方法的正确性。

In order to confirm whether the under-excitation limitation protection value coordinates with the field failure protection value,both of the values should be checked for power plant. Due to the principle of under-excitation limitation protection is different from that of field failure protection,the values must be normalized to the same plane to be compared. This paper introduced the method of converting impedance circle of field failure protection to power circle,which is verified to be correct by practical calculation and test.