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avr is an automayic voltage regulator ... it regulates
voltage before it synchronise with grid after
synchronisation it regulates power factor why....
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Answer Posted / k.prakashchandra
After synch,AVR keeps the gen voltage constant at the set
value. If the grid voltage is more than the gen voltage, the
pf becomes leading and lagging if the grid voltage is less
than the gen voltage.Then, in AVR mode the operator has to
reset the gen voltage so that the pf is slightly lagging.In
APF mode ,the pf always remains at the set value
irrespective of variations in grid voltage.
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