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I hv a question regarding power factor improvement just
after transformer. I request you to reply me plzz. thank
you sir.
My friend has a small unit of fabrication. in his factory
the main load is a welding machine, lathe machine, grinding
machine. this load is not continuous type. now our
electricity board has installed 16 KVA, 11000/433 V
transformer for our factory. In the energy meter (trivector
meter) at LV side of transformer, i hv seen power factor
value of 0.15 only when only 3 KW load was flowing. Further
electricity board has suggested to install 4 KVAR capacitor
at LV side after energy meter. Now my question is that if
we permanantly install and switch on 4 KVAR capacitor after
energy meter, during some load on transformer and also
without any load on transformer, wht will be the power
factor shown in energy meter?i dont want to get any penalty
by electricity board, so plz suggest me if i can
permanantly install and switch on the 4 kvar capacitor or
not at LV side of transformer just after energy meter?
Thank you again and awaiting for ur positive reply soon.
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Answer Posted / ranadev datta
The transformer at no load has a pf depending on relative
values of its no-load kW loss and the apparent no-load kVA.
A capacitor permanently connected to the LV side should be
of a kVAR value to just correct the inductive kVAR at no-
load and no more.
Separate sets of capacitors should be judiciously applied
to correct the pf on load. The best thing to do is to
switch the pf-improvement capacitors on and off along with
the switching of the individual offending loads (e.g., by
connecting the capacitors of appropriate ratings to the
motor terminals) thereby bringing about
inherently 'automatic' control of capacitor switching.
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