hw5s - EE 341 ENERGY CONVERSION Homework #5 Solutions 1. A...

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EE 341 – ENERGY CONVERSION 1 Homework #5 Solutions 1. A 100-kVA, 240/120-V Y-Y three-phase power transformer has a per-unit resistance of 0.01 pu and a per-unit reactance of 0.035 pu. The excitation branch elements are R C = 80 pu and X M = 20 pu. (a) If this transformer supplies a rated load at 0.8 PF lagging, draw the phasor diagram of one phase of the transformer. (b) What is the voltage regulation of the transformer bank under these conditions? (c) Sketch the equivalent circuit referred to the low-voltage side of one phase oh this transformer. Calculate all the transformer impedances referred to the low-voltage side. Solution: Select kVA S base 100 = , V V base P 240 , = , V V base S 240 , = (a) pu S o load 87 . 36 0 . 1 ) 8 . 0 ( cos 0 . 1 1 = = - o S V 0 0 . 1 = pu V S I o o o S load S 87 . 36 0 . 1 0 0 . 1 87 . 36 0 . 1 * * - = = = pu j Z I V V o o o eq S S P 225 . 1 0292 . 1 ) 035 . 0 01 . 0 ( 87 . 36 0 . 1 0 0 . 1 = + -
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This note was uploaded on 05/01/2008 for the course ECE 341 taught by Professor Keyhani during the Spring '08 term at Ohio State.

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hw5s - EE 341 ENERGY CONVERSION Homework #5 Solutions 1. A...

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