flashover signal

例句：

1. 1. The engineers used a flashover signal to alert the workers.
   工程师们使用闪络信号来警告工人。
2. 2.The power grid experienced a flashover signal that caused widespread damage.
   电网经历了一次闪络信号，造成了广泛的破坏。
3. 3.During an electrical storm, a flashover signal could indicate a severe problem with the power grid.
   在电气风暴期间，一个闪络信号可能表明电力网有严重的故障。