In order to meet an emergency, three single-phase transformers with 12,470/7,200 V rms are connected in Δ -Y to form a three-phase transformer which is fed by a 12,470- V transmission line. If the transformer supplies 60 MVA to a load, find:
(a) The turns ratio for each transformer,
(b) The currents in the primary and secondary windings of the transformer,
(c) The incoming and outgoing transmission line currents.