A three-phase 69 / 7.2kV Y transformer feeds a balanced Y-connected load of 10 ohms/phase on the Delta side. The transformer is in a system with base power S = 50 MVA and base voltage V = 75 kV on the primary side of the transformer. Draw the single-phase equivalent circuit of the Y-transformer and indicate the value of the effective turns ratio ag: Calculate the per-unit load impedance Rpu on the low voltage side, and the per-unit load impedance Rpu referred to the high voltage side.