How to select Capacitor size in KVAR for Power factor improvement.
Please find the attachment of PF improvement Table.
Example: Supplying load of 650Kw at a PF of 0.65. What size of capacitors is required to raise the PF to unity(1)? And how many more KW can connect for the same kVA loading when P.F improved.
Supplying kW = 650 kW
Multiplier to improve PF from 0.65 to unity (1) is 1.169.
Required Capacitor kVAR = kW x Table 1 Multiplier of 65 and 100
= 650kW x 1.169
= 759.85 kVAR
We know that P.F = Cosθ = kW/kVA . . .or
kVA = kW / Cosθ
= 650/0.65 = 1000 kVA
When Power Factor is raised to unity (1)
No of kW = kVA x Cosθ
= 1000 x 1 = 1000kW
Hence increased Power supplied
1000kW – 650kW = 350kW
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