Answer / velusamy

This problem can be solved by switching off all capacitor
banks during low load. we have faced Similar type of
problem in our cement plant loads which are fluctuating in
nature which causes export / import of power fluctuation(
loads go +500kw and - 500kw withing 1 or two seconds).

The main reason for this low power factor is due to
reactive power consumption of your 12.5 MVA power
transformer.

Answer / s.balasubramanian

If you can furnish me the scheme used by you for import
export ontrol I will be able to review
balasubramanian

Answer / k.prakashchandra

During export, it may be possible to improve pf with
excitation.The low pf may also be attributed to erroneous
measurement by CT's at very low loads.Tr may also contribute
to low pf to some extent depending on positions of pf meter
and capacitor bank .

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