方向元件就是可以随意人为地控制某个设备的正常运行，达到定向效果的目的。
提出了基于故障分量正序电抗的方向元件。
A new directional element based on the fault component positive sequence reactance (FCPSR) is presented.
方向元件是基于行波或暂态量的超高速方向保护的核心元件。
Directional unit is the kernel unit of the traveling waves or transients based ultra-high-speed directional protection for transmission line.
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。
Analysis shows that the voltage operating dead zone is small and have more sensitivity than traditional power directional relay.
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