How to select Capacitor size in KVAR for Power factor improvement.

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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