Three single-phase two-winding transformers, each rated $25 mathrm{MVA},38.1/3.81mathrm{kV}$, are connected to form a three-phase $mathrm{Y}-Delta$ bank with

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Three single-phase two-winding transformers, each rated $25 \mathrm{MVA},38.1/3.81\mathrm{kV}$, are connected to form a three-phase $\mathrm{Y}-\Delta$ bank with a balanced $\mathrm{Y}$-connected resistive load of $0.6 \Omega$ per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and $66 \mathrm{kV}$ (line-to-line) for the high voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance $\mathrm{R}_{\mathrm{L}}$ in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.

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