A 25KVA 4800/240V distribution transformer shown in Figure 1 has the following impedances: Rp = (2 + 0.1a) N, Xp = (3 – 0.1a) N, Rs = 0.0075 N, Xs = 0.0025 N, Rc = (150 + 5a) kN Хм 3D (10 + 0.5а) kn Xp R, Np Ng R IM Vs Ep XM Es R Figure 1 (a) Draw the approximate equivalent circuit of this transformer referred to the secondary side. Label all the impedances accordingly, and show all calculations involved. (b) The transformer is supplying rated load at 240V and (0.75 + 0.01a) power factor lagging. By using the approximate equivalent circuit, determine the transformer's input voltage. (c) What is its voltage regulation under the conditions of part (b)?

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