5-Assignment5_Solution

# 5-Assignment5_Soluti - ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University EE 255 Assignment#5 Solution Problem#1 A delta-wye

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ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University EE 255 Assignment #5 Solution Problem #1 A delta-wye three-phase transformer bank is supplying a balanced three-phase load of 750-KVA and 0.85 lagging power-factor. The line-to-line input voltage to the high side is 12-KV at 60 Hz. The phase-to-phase turns ratio of the transformer is 5:1. Determine the line voltage, phase voltage, line current, and phase current for both high and low sides. AB Ph Line V KV V V = = = 12 . (HVS) ph AB an V V V V = = = = 2400 5 12000 5 (LVS) Line an ab V V V V = = = 92 4156 3 . (LVS) A I I I ph Line a 17 104 2400 3 750000 . * = = = = A I I I a ph AB 83 20 5 17 104 5 . . = = = = A I I I ph Line A 08 36 3 . = = = Problem #2 b I AB I BC I CA I b I c I N A I B I C I a I c I lagging pf KVA 85 0 750 . - + KV 12

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Three 500-KVA, 7200/480-V, 60-Hz distribution transformers are connected wye-delta on a 12470 V, three-phase line. If the load is 1200 KVA, calculate the line and phase currents for both high and low sides. V
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## This note was uploaded on 12/19/2011 for the course EE 295 taught by Professor Alishaban during the Fall '11 term at Cal Poly.

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5-Assignment5_Soluti - ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University EE 255 Assignment#5 Solution Problem#1 A delta-wye

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