Connect 1 Semester Access Card For Electric Motors And Control Systems
2nd Edition
ISBN: 9781259550195
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 3.2, Problem 11RQ
The primary of a transformer is rated for 480 V and the secondary for 240 V. Which winding of the transformer has the larger-diameter conductor? Why?
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Students have asked these similar questions
The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz
transformer are to be determined. The open-circuit test and the short-
circuit test were performed on the primary side of the transformer, and
the following data were taken:
Open-circuit test
(on primary)
Short-circuit test
(on primary)
8000 V
V= 489 V
I0.214 A
2.5 A
P= 400 W
P= 240 W
Find the impedances of the approximate equivalent circuit referred to
the primary side, and sketch the circuit.
4. Why the efficiency of the transformer is high at half load compared to full load?
Q2 During routine tests of a three phase transformer, measurements of DC resistance between winding
terminals is noted down. What kind of information can be obtained from the values so noted?
Chapter 3 Solutions
Connect 1 Semester Access Card For Electric Motors And Control Systems
Ch. 3.1 - Prob. 1RQCh. 3.1 - a. If 1 MW of electric power is to be transmitted...Ch. 3.1 - Compare the type of AC power normally supplied to...Ch. 3.1 - a. Outline the basic function of a unit...Ch. 3.1 - list three factors taken into account in selecting...Ch. 3.1 - When motors and motor controllers are installed,...Ch. 3.1 - a. What types of conduit raceways are commonly...Ch. 3.1 - Compare the function of a switchboard, panelboard,...Ch. 3.2 - Define the terms primary and secondary as they...Ch. 3.2 - On what basis is a transformer classified as being...
Ch. 3.2 - Explain how the transfer of energy takes place in...Ch. 3.2 - In an ideal transformer, what is the relationship...Ch. 3.2 - A step-down transformer with a Wins ratio of 10:1...Ch. 3.2 - A step-up transformer has a primary current of 32...Ch. 3.2 - What is meant by the term transformer magnetizing,...Ch. 3.2 - Prob. 8RQCh. 3.2 - Prob. 9RQCh. 3.2 - Prob. 10RQCh. 3.2 - The primary of a transformer is rated for 480 V...Ch. 3.2 - A single-phase transformer is rated for 0.5 kVA, a...Ch. 3.3 - Explain the way in which the high-voltage and...Ch. 3.3 - Prob. 2RQCh. 3.3 - Prob. 3RQCh. 3.3 - Prob. 4RQCh. 3.3 - Prob. 5RQCh. 3.3 - Prob. 6RQCh. 3.3 - Prob. 7RQCh. 3.3 - Prob. 8RQCh. 3.3 - Explain the basic difference between the primary...Ch. 3.3 - Prob. 10RQCh. 3.3 - Prob. 11RQCh. 3.3 - Prob. 12RQCh. 3.3 - What important safety precaution should be...Ch. 3.3 - Prob. 14RQCh. 3.3 - The control transformer for an across-the-line...Ch. 3.3 - The two primary windings of a dual-primary control...Ch. 3.3 - Prob. 3TCh. 3.3 - A dry-type general-purpose power transformer is...Ch. 3.3 - A current transformer is to be tested in circuit...Ch. 3.3 - Discuss how electric power might be distributed...Ch. 3.3 - A block of several transformers arc fed from...Ch. 3.3 - How would you proceed with a DC resistance check...Ch. 3.3 - Prob. 5DT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What is the purpose of a transformer? Draw the symbols for a transformer.arrow_forwardAn open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 V, what is the high-leg voltage?arrow_forwardWhy is it important to reduce the moisture within a transformer to acceptable levels during transformer installation?arrow_forward
- For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50arrow_forwardRework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at (a) unity power factor, (b) 0.8 power factor leading. Compare the results with those of Problem 3.14. -arrow_forwardA single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.arrow_forward
- 1. Explain why transformer saturation occurs at a lower voltage value when the frequency of the ac power source is decreased?arrow_forwardExample 2-2. The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short-circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) Voc = 8000 V Vsc = 489 V loc = 0.214 A Isc = 2.5 A Voc = 400 W Ps = 240 Warrow_forwardHow do you calculate N1/N2? Ratio of primary to secondary turns of a transformer?arrow_forward
- The circuit for a 20-kVA, 220/3960 V, 50-Hz transformer is shown in Figure (1). The open- circuit test and the short-circuit test was performed on this transformer and the following data were taken: Open-Circuit test: Voc=240 V, Ioc=2.8 A, Poc=260 W Short-Circuit test: Vsc = 350 V, Isc=7.6 A, Psc = 420 W 1) Find the values of Rc, XM, Rp and Xs for this transformer. 2) Find the equivalent circuit of this transformer referred to the high-voltage side and draw the circuit. j 0.163 Q jXM 0.02 02 jXsarrow_forwardThe equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short- circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) Voc = 8000 V Ve = 489 V Ioc = 0.214 A Isc = 2.5 A Poc = 400 W Pyc = 240 W Find the impedances of the approximate equivalent circuit referred to the primary side, and sketch the circuit.arrow_forwardA normal transformer has a nominal 60 kVA. The nominal primary and secondary voltages are 600 V and 120 V respectively. a-) What is the rated current for each winding? b-) If the primary winding is connected to 600 Vac, how many kVA of load can be connected to the secondary?arrow_forward
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