Question: A balanced Y-connected voltage source with (E_{a g}=277 / 0^{circ}) volts is applied to a balanced- (Y) load in parallel with a balanced- (Delta) load

A balanced Y-connected voltage source with $E_{a g}=277 / 0^{\circ}$ volts is applied to a balanced- $Y$ load in parallel with a balanced- $\Delta$ load where $Z_{Y}=20+$ $j 10$ and $Z \Delta=30-j 15$ ohms. The $\mathrm{Y}$ load is solidly grounded. Using base values of $S_{\text {basel } \phi}=10 \mathrm{kVA}$ and $\mathrm{V}_{\text {baseLN }}=277$ volts, calculate the source current $I_{a}$ in per-unit and in amperes.

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