
Three-phase Systems and Circuits 405
[Ans. Phase currents: 10∠−90°, 15.6 ∠−140°, 12.5 ∠ 120°;
Active powers: 0 W, 3662 W, 3125 W;
Reactive powers: 2500 VAR, 1333 VAR, 0 VAR]
24. Given a balanced three-phase, three-wire system with y-connected load for which line volt-
age is 230 V and impedance of each phase is (6 + j8) Ω. Find the line current and power
absorbed by each phase.
[Ans. I
L
= 13.3 A,
Power = 1061 W]
25. A three-phase 400-V, 50 Hz, AC supply is feeding a three-phase delta-connected load with
each phase having a resistance of 25 Ω , an inductance of 0.15 H and a capacitor of 120 µF
in series. Determine the line current, apparent ...