The limit conditions for the end voltage of the induction machine are derived, according to the asymmetric condition of the machine stator winding.
考虑感应电机定子绕组接线的不对称情况，推导出电机端电压的约束条件。
2
Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.
In resonant ground systems, both asymmetric fault of high-voltage side and asymmetry of load cause the asymmetry of system electrical source voltage. Then they change neutral displacement voltage.