1:52 PM | 0.9KB/s 0. 35% 401831 3. A single-phase 10-kVA 480/120-V transformer is to be used as an autotransformer tying

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1 52 Pm 0 9kb S 0 35 401831 3 A Single Phase 10 Kva 480 120 V Transformer Is To Be Used As An Autotransformer Tying 1 (31.27 KiB) Viewed 13 times

1:52 PM | 0.9KB/s 0. 35% 401831 3. A single-phase 10-kVA 480/120-V transformer is to be used as an autotransformer tying a 600-V distribution line to a 480-V load. When it is tested as a conventional transformer, the following values are measured on the primary (480-V) side of the transformer: Voltage(V) Current(A) Power (W) 0.41 Open circuit Short circuit 480 10 38 26 10.6 (a) Find the per-unit equivalent circuit of this transformer when it is connected in the conventional manner. What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? (b) Sketch the transformer connections when it is used as a 600/480-V step-down autotransformer. (c) What is the apparent power of this transformer when it is used in the autotransformer connection? (d) Answer the questions in (a) for the autotransformer connection. (15 points)