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how to caluculate APFC panel rating, my running Load is
1320KW, Present P.F 0.76 to 0.8 we need 0.98 p.f
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Answer Posted / maprayil
KVAr is square root of (KVA2-kW2). In your case the system KVAr at P.F. 0.76 lag is 1129 KVAr; and P.F. 0.80, it is 990 KVAr. (These are the KVAr values required to take your system P.F. to Unity or 1.00). Please note the following values:-
With a running load of 1320 kW, the Maximum Demand (KVA) of your system at 0.76 PF is 1737 KVA; and at P.F. 0.80, it is 1650 KVA. At a P.F. of 0.98, the Max Demand would be 1347 KVA (KVA = kW/P.F.).
Now that you have the system KVAR & KVA values, the simplest way is to calculate the system KVAR after P.F. is improved to 0.98 lag (your desired value). This can be worked by (considering initial P.F. 0.76):-
KVAR = Square root ((KVA+kW)*(KVA-kW))
= Square root ((1347+1320)*(1347-1320)
= Square root (2667 * 27) = SQRT 72009
= 268 KVAr.
So KVAR required for improving the P.F. of 1320 kW running load from 0.76 to 0.98 is 1129 KVAR (initial system KVAR) minus 268 KVAr (final system KVAR), i.e., 861 KVAr. This KVAR needs to be installed in multiple steps with automatic switching arrangement.
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