# HW3 - ECE 3070 1 Homework#3 The resistances and leakage...

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ECE 3070 Homework #3 1. The resistances and leakage reactances in ohms of a 25-kVA, 60-Hz, 2400:240-V distribution transformer are R 1 = 0.650 R 2 = 0.00650 X l1 = 8.40 X l2 = 0.0840 where subscript 1 denotes the 2400-V winding and subscript 2 denotes the 240-V winding. Each quantity is referred to its own side of the transformer. (a) Draw the equivalent circuit referred to (i) the high- and (ii) the low-voltage sides. Label the impedances numerically. (b) Consider the transformer to deliver its rated kilovoltamperes at 0.80 power factor lagging to a load on the low-voltage side with 240 V across the load. Find the high- side terminal voltage. 2. A 550-kVA 60-Hz transformer with a 13.8-kV primary winding draws 4.55 A and 3250 W at no load, rated voltage and frequency. Another transformer has a core with all its linear dimensions 2 times as large as the corresponding dimensions of the first transformer. The core material and lamination thickness are the same in both transformers. If the primary

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HW3 - ECE 3070 1 Homework#3 The resistances and leakage...

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