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1:52 PM | 0.7KB/s.. 2/8 la 35% 第2克共8页 PART II. Transformer problem (Total 45 points) 1. A 50-kVA, 7200/480-V transformer
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1:52 PM | 0.7KB/s.. 2/8 la 35% 第2克共8页 PART II. Transformer problem (Total 45 points) 1. A 50-kVA, 7200/480-V transformer
1:52 PM | 0.7KB/s.. 2/8 la 35% 第2克共8页 PART II. Transformer problem (Total 45 points) 1. A 50-kVA, 7200/480-V transformer has been tested to determine its equivalent circuit. The results of the tests are shown below. Voltage(V) Current(A) 5.2 Power(W) 245 Open circuit 480 Performed on Low voltage side High voltage side of the Short circuit 157 615 (a) Find the equivalent circuit of this transformer referred to the low-voltage side of transformer. (b) Find the transformer's voltage regulation at rated conditions and (1) 0.9 PF lagging. (2) 1.0 PF, (3) 0.9 PF leading (c) Determine the transformer's efficiency at rated conditions and 0.8 PF lagging. (15 points)