基于对称分量法理论，提出了基于检测正序、负序、零序电流分量的电动机保护方法。
Based on the symmetry component theory, a method of the motor protection is presented by measuring positive, negative and zero sequence current component.
不对称度的增加将进一步增大电容电压的脉动和负序电流的大小。
Larger system voltage unbalance degree causes larger capacitor voltage pulsation and negative sequence current.
计算分析结果表明，该方法能够有效抑制由线路参数不对称产生的负序电流和电压。
The results from calculation and simulation show that the proposed method can effectively restrain the negative sequence voltage and current caused by unbalanced parameters of transmission line.
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