An adaptive impedance relay based on negativesequencevoltage polarization is proposed, and its operating characteristic is analyzed.
提出了一种基于负序电压极化的自适应接地阻抗继电器方案，并对其动作特性进行了分析。
2
The results from calculation and simulation show that the proposed method can effectively restrain the negativesequencevoltage and current caused by unbalanced parameters of transmission line.
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。
3
Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negativesequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.