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A 400 V, 50 Hz, three phase balanced source supplies power to a star connected load whose rating is 12 √3 k VA, 0.8 pf (lag). The rating (in kVAR) of the delta connected (capacitive) reactive power bank necessary to bring the pf to unity is
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- 28.78
- 21.60
- 16.60
- 12.47
Correct Option: D
Given VA readings = 12 √3 kVA.
cos φ = 0.8 pf (lag)
To bring power factor to unity cos φ of delta connected network = 0.8 pf (leading)
sin φ = 0.6
kVAR (Reactive Power) = 12 √3 × 0.6 = 12.47 kVAR
