Question: Three single-phase two-winding transformers, each rated 25 MVA, 54.2 / 5.42 k V 54.2 / 5.42 k V , are connected to form a three-phase

Three single-phase two-winding transformers, each rated 25 MVA, $54.2 / 5.42 k V$ , are connected to form a three-phase $Y - Δ$ bank with a balanced Y-connected resistive load of $0.6 Ω$ per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and $94 k V$ (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 $R_{L}$ 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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