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Voltage Regulation of Synchronous Generator:

The Voltage Regulation of Synchronous Generator is defined on lines similar to that of a transformer. Consider the generator supplying full-load current at a specified power factor and rated terminal voltage, Vt (rated).

As the load is thrown off keeping the field current constant, the terminal voltage rises to

Voltage Regulation of Synchronous Generator

The percentage voltage regulation of synchronous generator is then defined as

Voltage Regulation of Synchronous Generator