The voltage regulation of an alternator is defined as the percentage rise in voltage when full‒load is removed, (field excitation and speed remaining the same) divided by the rated terminal voltage.
VOLTAGE
REGULATION
It is clear that with
change in load, there is a change is terminal voltage of an alternator. The
magnitude of this change depends not only on the load but also on the load
power factor.
The voltage regulation
of an alternator is defined as the percentage rise in voltage when full‒load is
removed, (field excitation and speed remaining the same) divided by the rated
terminal voltage.
% regulation up = [ (E0‒V) / V ] ×
100

Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Tag: Basic Engineering : Synchronous Machines - Voltage Regulation
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