This paper mainly studies the coupling error caused by induction voltage phase difference, and fluctuation of directionalsensitivity caused by changes in near-field difference slope.
本文着重研究了因近场感应电压相位差引起的耦合误差，以及近场天线差斜率变化引起的定向灵敏度的变化；
2
Analysis shows that the voltage operating dead zone is small and have more sensitivity than traditional power directional relay.
分析表明其电压动作死区很小，比传统的功率方向元件具有更高的动作灵敏性。
3
Different conditions causing the sensitivity deficiency of pilot zero-sequence directional protection are analyzed and the necessity of adopting zero-sequence voltage compensation is discussed.