6. The star-connected load having impedance of \( 40-\mathrm{j} 20 \Omega \) per phase is connected in parallel with the delta-connected load having impedance of \( 20+j 40 \Omega \) per phase. With both the loads being balanced, and fed from a three-phase, \( 230 \mathrm{~V} \), balanced supply, with the phase sequence as R-Y-B. Find the line current, power factor, total power \& reactive VA, and also total volt-amperes (VA).
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The phase voltage for a star-connected load is equal to the line voltage, which is 230V. The phase impedance is given as 40-j20 Ω. So, the phase current, I1 = V/Z = 230/(40-j20) = 4.6+j2.3 A Show more…
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