4.44 A three-phase, 150kVA, 12,470/208 V distribution transformer bank supplies 150kVA to a balanced, three-phase load connected to its secondary-side terminals. Find the KVA rating and turns ratio of each single-phase transformer unit as well as their primary- and secondary-side voltages and currents, if the transformer bank is connected in (a) Wye-wye (b) Delta-delta