The above two conditions are not conducive to the normal operation of electrical equipment, severe will lead to the incineration of electrical equipment.

There are three problematic factors for the supply voltage:

There are doubts about the voltage regulator configuration of the generator in the power plant, resulting in unstable output voltage. These are usually small hydropower plants.

The function of power transformers in substations or distribution stations is reduced, usually due to severe disrepair and aging.

The total electricity consumption in the region greatly exceeds the power supply load, resulting in continued low power supply voltage, and even the severe low power supply frequency will cause the grid to collapse and cause a large area of power outage.

If the power supply network presents a long-term supply voltage instability, the voltage may continue to be low or high; Then you should choose a regulator to stabilize the voltage.