Answer Posted / sunil kumar sinha
An AVR is automatic voltage regulator. This device is
mainly used for keeping the terminal volage of generator at
constant level irrespective of load. This is normally used
to avoid over voltage & under volage of generator terminal
voltage.
over voltage on generator may cause generator stator
insulation failure and undervolage may cause supply of bad
quality of electricity.
AVR system all the time monitors terminal voltage of
generator and the current. This also sees whether the
connected load is inductive,resistive or capacitive and
regulates the excitation in such a way that terminal
voltage remains fixed at the set value.
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