Answer / guest

Increased freq will increase EMF generated which in turn
will increase KVA rating.

Answer / senthil nathan

If they increase frequency of the supply means perfomence
of the load will increased. number of cycles per second is
increased. that mean speed of the motor (load) is increased.

Answer / kj

The main reason for the increase in the kva is that the
diesel engine produces more HP at 1800 rpm than at 1500 rpm.
This allows a higher kw output. The alternator can also
handle the higher current and therefore the kva is
increased. Note that the rated power factor stays the same.
This is because the amount of cooling air is increased at
the higher speed.
The increase in the EMF per turn allows a higher voltage to
be generated but this is reduced by the AVR reducing the
excitation. This has no effect on the kva capacity of the
generator set.

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