The per-unit equivalent circuit of two transformers (T_{a}) and (T_{b}) connected in parallel, with the same nominal

Question:

The per-unit equivalent circuit of two transformers \(T_{a}\) and \(T_{b}\) connected in parallel, with the same nominal voltage ratio and the same reactance of 0.1 per unit on the same base, is shown in Figure 3.43. Transformer \(T_{b}\) has a voltage-magnitude step-up toward the load of 1.05 times that of \(T_{a}\) (that is, the tap on the secondary winding of \(T_{b}\) is set to 1.05). The load is represented by \(0.8+j 0.6\) per unit at a voltage \(V_{2}=1.0 / 0^{\circ}\) per unit. Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive powers.

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