The protective relay is a sensing device, which senses the fault, determines its location and then send command to the proper circuit breaker by closing its trip coil.

保护继电器是一个传感装置，感官的过错，确定其位置，然后发送命令关闭其旅行线圈到正确的断路器。

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The pilotless image transmission system based on satellite relay communication is very important in remote sensing transmission applications.

基于卫星中继的无人机图像传输系统在遥感图像的传输中有着十分重要的作用。

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That led the relay, a kind of sensing device, to incorrectly conclude there was an electrical problem and tell a nearby electrical switch to isolate the perceived problem, reducing the flow of power to the Superdome during the game's third quarter.

WSJ: Device Setting Triggered Super Bowl Outage