The monitoring principle of field windings inter-turn short circuits based on the unbalanced current root mean square(RMS) value in the main protection overcomes defects of the fault monitoring using the single harmonic detections,and can maximize the fault characteristics information extracted.The sensitivities of the Three Gorges and Pengshui generators are analyzed through simulations.Factors affecting their sensitivities are analyzed with respect to measured data.Based on the analysis,a monitoring schem...