Answer Posted / k.prakashchandra

It keeps the gen voltage the same at the set value
irrespective of variation in speed , load and grid voltage
after synchronization. It is useful whenever there is grid
failure as the gen speed suddenly increases to an extent
depending on the load interrupted.Then AVR does not allow
for rise in voltage.It is also very helpful while
synchronizing as you do not have to vary the excitation
every now and then ,once you have matched the voltages.If
you desire to keep the pf constant after synch and loading
,you have to switch over to APF mode from AVR ,both being
available with Auto channel.

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