The per-unit equivalent circuit of two transformers, Ask an Expert

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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.

Transformer T_b has a voltage-magnitude step-up toward the load of 1.05 times that of T_b (that is, the tap on the secondary winding of Ta is set to 1.05). The load is represented by 0.8 + j0.6 per unit at a voltage V₂ = 1.0/0° 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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