According to the query of Baidu Library, the standard of power company's flash stop is mainly voltage sag. This is a common power problem. Because the power supply system is disturbed, the voltage drops temporarily. There are many reasons for voltage sag, including system failure, lightning, flashover, animal contact and so on. This kind of fault will lead to the interruption of power supply, which usually lasts between tens of milliseconds and 200 milliseconds. Due to the short duration, it usually has little impact on power equipment.
However, for some enterprises that require high power stability, such as hospitals and data centers, voltage sag may still cause great losses. Therefore, these enterprises need to take measures to reduce the impact of voltage sag, such as using uninterruptible power supply (UPS) and other equipment.