Electric Machinery and Power System Fundamentals

1st Edition

ISBN: 9780072291353

Author: Stephen J. Chapman, Stepehn J. Chapman

Publisher: McGraw-Hill Companies, The

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Textbook Question

Chapter 2, Problem 2.1P

A 100-kVA, 8000/277-V distribution transformer has the following resistances and reactances: R P = 5 Ω R S = 0.005 Ω X P = 6 Ω X S = 0.006 Ω R C = 50 kΩ X M = 10 kΩ

The excitation branch impedances are given referred to the high-voltage side of the transformer.

Find the equivalent circuit of this transformer referred to the low-voltage side.
Find the per-unit equivalent circuit of this transformer.
Assume that this transformer is supplying rated load at 277 V and 0.85 PF lagging. What is this transformer’s input voltage? What is its voltage regulation?
What are the copper losses and core losses in this transformer under the conditions of part (c)?
What is the transformer’s efficiency under the conditions of part (c)?

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Chapter 2, Problem 2.21Q

Chapter 2, Problem 2.2P

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Chapter 2 Solutions

Electric Machinery and Power System Fundamentals

Ch. 2 - Is the turns ratio of a transformer the same as...Ch. 2 - Why does the magnetization current impose an upper...Ch. 2 - What components compose the excitation current of...Ch. 2 - What is the leakage flux in a transformer? Why is...Ch. 2 - List and describe the types of losses that occur...Ch. 2 - Why does the power factor of a load affect the...Ch. 2 - Why does the short-circuit test essentially show...Ch. 2 - Why does the open-circuit test essentially show...Ch. 2 - How does the per-unit system of measurement...Ch. 2 - Why can autotransformers handle more power than...

Ch. 2 - What are transformer taps? Why are they used?Ch. 2 - What are the problems associated with the Yâ€”Y...Ch. 2 - What is a TCUL transformer?Ch. 2 - How can three-phase transformation be accomplished...Ch. 2 - Prob. 2.15Q Ch. 2 - Can a 60-Hz transformer be operated on a 50-Hz...Ch. 2 - What happens to a transformer when it is first...Ch. 2 - What is a potential transform? How is it used?Ch. 2 - What is a current transformer? How is it used?Ch. 2 - A distribution transformer is rated at 18 kVA,...Ch. 2 - Why does one hear a hum when standing near a large...Ch. 2 - A 100-kVA, 8000/277-V distribution transformer has...Ch. 2 - A single-phase power system is shown in Figure...Ch. 2 - Consider a simple power system consisting of an...Ch. 2 - The secondary winding of a real transformer has a...Ch. 2 - When travelers from the USA and Canada visit...Ch. 2 - A 1000-VA, 230/115-V transformer has been tested...Ch. 2 - A 30-kVA, 8000/230-V distribution transformer has...Ch. 2 - A 150-MVA, 15/200-kV, single-phase power...Ch. 2 - A 5000-kVA, 230/13.8-kV, single-phase power...Ch. 2 - A three-phase transformer bank is to handle 500...Ch. 2 - A 100-MVA, 230/115-kV, Y three-phase power...Ch. 2 - Three 20-kVA, 24,000/277-V distribution...Ch. 2 - A 14,000/480-V, three-phase, Y-connected...Ch. 2 - A 13.8-kV, single-phase generator supplies power...Ch. 2 - An autotransformer is used to connect a 12.6-kV...Ch. 2 - Prove the following statement: If a transformer...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - Two phases of a 14.4-kV, three-phase distribution...Ch. 2 - A 50-kVA, 20,000/480-V, 60-Hz, single-phase...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - A single-phase, 10-kVA, 480/120-V transformer is...Ch. 2 - Figure P2-4 shows a one-line diagram of a power...

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