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1. The flash-over ground relay is essential for protecting the power grid from faults.
过电压保护继电器对于保护电网免受故障至关重要。
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2. The engineer installed a new flash-over ground relay to improve the reliability of the power system.
工程师安装了一个新的过电压保护继电器，以提高电力系统的可靠性。
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3. During a lightning storm, the flash-over ground relay quickly detected and isolated the faulty section of the power line.
在雷暴期间，过电压保护继电器迅速检测并隔离了电力线路的故障部分。