1.After synchronising the alternator to the grid,how we r
delivering power to the grid?if the i/p increases does the
speed hence frequency increases?
2.y the power factor is changing when exitation changes?what
is the relation with p.f and flux?
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Answer Posted / k.prakashchandra
If you want to increase the speed more input to prime mover
is required.As the grid is very large ,this will result only
in more sharing of load.You can not change the frequency.If
you increase the excitation, the terminal voltage of gen
will increase ,and you can not increase the entire grid
voltage . This additional voltage will drop in the gen
itself and a small portion of grid ,resulting in more gen
current and increased lagging pf.If the terminal voltage of
the gen is less than grid voltage the power will be
evacuated at leading pf and again more gen current.
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