后备继电系统将设置第一、第二与第三区方向距离继电器，以防相位故障与接地故障。
The backup relaying system will have first, second, and third zone directional distance relays for protection against phase and ground faults.
差动测量探测器具有用于将差动探测尖端的外部屏蔽导体电连接在一起的接地夹系统。
A differential measurement probe has a ground clip system for electrically coupling outer shielding conductors of differential probing tips together.
系统地研究了架设在凹形接地面上的倒l天线的电特性。
This paper investigates the inverted L antennas mounted on a conducting concave surface.
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