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中文摘要：
提出一种用于超高压和特高压输电线路上的分相方向元件。通过比较故障分量补偿电压和故障前电压的相位，从而判断是否正方向故障。该分相方向元件具有极强的方向性，能反应系统全相、非全相和振荡状态下的各种对称和不对称故障，具有很高的承受过渡电阻的能力。通过各种情况下大量仿真试验证明了此原理的优越性。
英文摘要：
A segregated phase directional relay is proposed, which can be used on EHV and UHV transmission lines. Faults in the protected and reverse directions can be reliably identified by comparing the phase angles of the fault component compensated voltage and voltage prior to fault. With its remarkable directional identifying capability, the relay proposed can maintain reliable operation even under fault in power swing and two-phase operation conditions and allows for great fault resistances. Its excellent properties have been proved by numerous digital simulations.
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