Generator loss of excitation protection is generally based on the R-X coordinate plane, while the low excitation limit is generally based on the P-Q coordinate plane. Due to the above two are not on the same coordinate plane, the coordination relationship between them cannot be shown intuitively. A0 reduction method suitable for engineering practice is proposed, that is, the setting of loss of excitation protection is mapped from R-X coordinate plane to P-Q coordinate plane. Based on P-Q coordinate plane, generator loss of excitation protection and low excitation limit are calculated, and the correctness of the method is verified with a cooperation of network related protection example of a power plant.
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