对于短时低电压扰动发生、恢复时刻的检测与定位则是电能质量监测和统计中获取相关指标首先要解决的问题。
The detection and location of the start point and end point of the voltage sag and swell is a key problem for the power quality monitoring.
低电压电路（即使它们是低电压）必须和保护地连接，这样危险电压才能被检测出来。
The low voltage circuit (even with low voltage on it) shall also be connected with protective earth, thus the dangerous voltage can be detected.
低电压电路（即使它们是低电压）必须和保护地连接，这样危险电压才能被检测出来。
The low voltage circuit (even with low voltage on it) shall also be connected with protective earth, thus the dangerous voltage can be detected.
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