Convert KVAR to Farads (For Power factor improvement)

Here is a simple calculation for converting KVAR to Farads and vice versa. It is help you to find actual capacitor size. 

Example for calculating KVAR values.

Example:

A Single phase 380V, 50Hz, motor with rated current of 30A at a P.F (Power factor) of 0.6. The motor power factor has to be improved to 0.9 by connecting a capacitor in parallel with it. Calculate the required capacity of Capacitor in both KVAR and Farads.

Solution: Two Methods for Finding KVAR

Method 1: (By PF Multiplier Table)

Motor Input Power, P = V x I x Cosθ

                        = 380V x 30A x 0.6

                        = 6840 W

                        = 6840 / 1000 KW

                        = 6.84 KW

From PF Multiplier Table, improve PF from 0.60 to 0.90 is 0.849

Required Capacitor KVAR to improve P.F from 0.60 to 0.90

Required Capacitor, KVAR = KW x Table Multiplier of 0.60 and 0.90

= 6.84 KW x 0.849

= 5.807 KVAR

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