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accessibility: For a conceptual single-phase, phase-shifting
transformer, the primary voltage leads the secondary voltage by
30degree. A load connected to the secondary winding absorbs 50
kVA at 0.9 power factor leading at a voltage E = 277 <0* volts.
Determine: The primary voltage; Primary and secondary current;
Load impedance referred to the primary winding; Complex power
supplied to the primary winding.  Want an answer?