The rated voltage of an electrical power source is defined as the terminal voltage at full rated load current. The output terminal voltage rises with decreasing load current, rising to its maximum value at zero load (no-load)
Ship power system voltage regulation
Voltage regulation is a common term used to describe the voltage change that a load connected to the ship transformer or ship generator terminals, or at the end of a long cable, would see. It indicates the voltage variation in the terminal voltage of the source from fully loaded to fully unloaded conditions.
All loads should be designed to withstand this voltage variation. Alternatively, if a constant voltage is desired at the load terminals, the source voltage must be regulated by automatic feedback control in the
percentage range equal to the percentage voltage regulation.
Voltage deviation in ship power system
Therefore, the voltage regulation defines the load voltage deviation without the voltage regulator, or the voltage range over which the regulator must control the source voltage.