New principle for feeder grounding fault protection based on zero sequence admittance is presented in this paper. Criterions for the line ground relay with zero sequence admittance are also discussed.

提出了采用测量线路零序导纳进行接地保护的新原理，讨论了直线式导纳继电器的接地保护判据。

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Using the company's UAS battle-management software, airborne operators issued NATO-standard sensor and air-vehicle commands via a UHF satellite communication link and ground-station relay.

采用波音公司无人机战斗管理软件，机载操作人员通过特高频卫星通信链路和地面站中继发布北约标准传感器和飞行器命令。

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It is also using these facilities to relay information from employees on the ground to its senior managers, and to get instructions from Cisco's leaders back out to its 67,000 staff.

公司还利用这些设施及时将采自最基层的信息逐级反馈给各级管理者，并能够将Cisco公司首脑们的指令迅速传达给公司所有的6.7万名员工。

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In April, China launched its first tracking data relay satellite to lessen its dependency on ground satellite control and relay stations.

CENTERFORSECURITYPOLICY: China��s one world?

But like radar technology, ADS-B currently relies on ground stations to relay information, making it useless over remote areas.

BBC: The key to preventing lost planes

Both spacecraft make use of the US space agency's Tracking and Data Relay Satellite System (TDRSS) to speak to the ground and controllers do not want any conflicts.

BBC: Total cargo: 4,860kg