Grid voltage drop to 70%, can last for a few seconds

The duration of a voltage drop to 70% depends on the specific cause and location. If it is due to sudden load changes or line faults, etc. caused by the voltage drop, generally shorter duration, may be only a few milliseconds or a few seconds. Whereas, if the global grid voltage drop is due to a large-scale blackout, natural disaster, etc., it may last longer, even up to several hours or days, etc. In addition, a drop in grid voltage can have an impact on both power equipment and power-using equipment. In the case of a voltage drop, various electrical equipment may malfunction or be damaged, especially for some equipment with high voltage requirements (e.g., computers, medical equipment, etc.), which are easily affected. Therefore, in practical application, it is necessary to detect and deal with grid voltage drop events in a timely manner through power system monitoring and control technology, in order to ensure the stable and reliable operation of the power system.