Relationship between overvoltage and Undervoltage protector and correction value

‌The relationship between overvoltage and Undervoltage protector and correction value is mainly reflected in the action threshold setting of the protector, namely undervoltage recovery value and overvoltage protection value‌. These values ​​are usually determined according to the stability of the power grid, the tolerance of the equipment, and the system requirements, and are directly related to the voltage conditions under which the protector will cut off or reconnect the power supply.

‌Undervoltage recovery value‌:

The undervoltage recovery value is usually set between 85% and 90% of the rated voltage‌.

This value determines the extent to which the voltage is restored before the protector reconnects the power supply to ensure the stable operation of the power grid and prevent the equipment from being damaged when the voltage is unstable‌.

The stability of the power grid, the tolerance of the equipment, and the system requirements are the main factors affecting the setting of the undervoltage recovery value‌.

‌Overvoltage protection value‌:

According to the technical requirements for grid-connected photovoltaic systems, the overvoltage protection range of the AC output side is 85% to 110% of the rated voltage. When this standard is exceeded, the inverter and other protective devices must stop running‌.
This means that if the voltage exceeds the set overvoltage protection value, the protector will immediately cut off the power supply to prevent the equipment from being damaged by overvoltage.

‌Importance of correction value‌:

Accurate setting of correction value (i.e. Undervoltage recovery value and overvoltage protection value) is crucial to protect electrical equipment and personal safety.

Reasonable correction value can ensure that the protector can act in time and accurately when the voltage is abnormal, thereby effectively avoiding equipment damage and safety accidents.

In summary, there is a close relationship between overvoltage and undervoltage protectors and correction values. By reasonably setting the under-voltage recovery value and overvoltage protection value, it can be ensured that the protector can act accurately and timely when the voltage is abnormal, thereby effectively protecting electrical equipment and personal safety.