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A 20-kVA, 8000:480-V distribution transformer has the following resistances and reactances: Rp= 32 ohm Rs=0.05 ohm Xp= 45 ohm Xs = 0.06 ohm Rc=250,000 ohm XM= 30,000 ohm %3D %3D The excitation branch impedances are referred to the high-voltage side. a) Find the equivalent circuit of the transformer referred to the high- voltage side. b) Find the per unit equivalent circuit of this transformer. c) Assume that the transformer is supplying rated load at 480 V and 0.8 power factor lagging. What is this transformer's input voltage? What is its voltage regulation? d) What is this transformer's efficiency under the conditions of part

A 20-kVA, 8000:480-V distribution transformer has the following resistances and reactances: Rp= 32 ohm Rs=0.05 ohm Xp= 45 ohm Xs = 0.06 ohm Rc=250,000 ohm XM= 30,000 ohm %3D %3D The excitation branch impedances are referred to the high-voltage side. a) Find the equivalent circuit of the transformer referred to the high- voltage side. b) Find the per unit equivalent circuit of this transformer. c) Assume that the transformer is supplying rated load at 480 V and 0.8 power factor lagging. What is this transformer's input voltage? What is its voltage regulation? d) What is this transformer's efficiency under the conditions of part

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 20-kVA, 8000:480-V distribution transformer has the following resistances and reactances: Rp=32 ohm Rs=0.05 ohm Xp= 45 ohm Xs = 0.06 ohm Rc=250,000 ohm XM= 30,000 ohm The excitation branch impedances are referred to the high-voltage side. a) Find the equivalent circuit of the transformer referred to the high- voltage side. b) Find the per unit equivalent circuit of this transformer. c) Assume that the transformer is supplying rated load at 480 V and 0.8 power factor lagging. What is this transformer's input voltage? What is its voltage regulation? d) What is this transformer's efficiency under the conditions of part (c)? 57 EMI Transformers Dr Thamir Hassan ATYIA Tikrit University
Transcribed Image Text:A 20-kVA, 8000:480-V distribution transformer has the following resistances and reactances: Rp=32 ohm Rs=0.05 ohm Xp= 45 ohm Xs = 0.06 ohm Rc=250,000 ohm XM= 30,000 ohm The excitation branch impedances are referred to the high-voltage side. a) Find the equivalent circuit of the transformer referred to the high- voltage side. b) Find the per unit equivalent circuit of this transformer. c) Assume that the transformer is supplying rated load at 480 V and 0.8 power factor lagging. What is this transformer's input voltage? What is its voltage regulation? d) What is this transformer's efficiency under the conditions of part (c)? 57 EMI Transformers Dr Thamir Hassan ATYIA Tikrit University
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