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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Chapter 3.3, Problem 5DT
To determine
The procedure to verify the test using an Ohm-meter.
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Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its
excitation branch components, its series impedances, and its voltage regulation. The fol-
lowing test data have been taken from the transformer:
Open-circuit test
(low voltage side)
Voc 230 V
loc= 2.1 A
Voc = 50 w
Short-circuit test
(high voltage side)
Vsc = 47 V
sc = 6.0 A
Psc 160 W
Find the equivalent circuit parameters Xp,Rp,Xs, Rs, Xm,Rc
Q5. For the following center tapped transformer, show the waveform across each half of
the secondary winding and across R, when a 100 V peak sine wave is applied to the
primarywinding. What is the PIV rating must the diodeshave?
(Use constant voltage drop model for the Silicon diode)
D
IN4001
OV
10 kN
IN4001
DELL
1) what is the potential transformer used for in power substation?
2) what is process leads to lowering the number of free electrons?
3) what is The Townsend's Criterion
4) why Sulphur Hexafluorid has good insulation strength?
5) What is Intrinsic Breakdown
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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- b) A certain winding made up of copper has a resistance of 100 Q at room temperature. If resistance temperature coefficient of copper at 0 C° is 0.00428/C°, calculate the winding resistance if temperature is increased to 45 C°. Assume room temperature as 25 C°.arrow_forward3. Show full solution. Magnetically coupled circuits.arrow_forward2-An ideal transformer consists of a primary winding (100 turn) and a secondary winding (1000 turn). The secondary winding is connected to a resistance (50 ohm). The amount of electric current in the secondary winding which equil to , when the voltage on the secondary winding is 100 voltsarrow_forward
- Describe the four tests carried out on the transformer and state their purposearrow_forwardIn the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?arrow_forward1) what is the potential transformer used for in power substation? 2) what is process leads to lowering the number of free electrons? 3) what is The Townsend's Criterion 4) why Sulphur Hexafluorid has good insulation strength? 5) What is Intrinsic Breakdown 6) why do bubbles lead to breakdown of liquid?arrow_forward
- a) The transformer has a turns ratio of 9.45, what is the dc load voltage considering the ripple voltage? b) The transformer has a turns ratio of 9.45, what is the dc load voltage without considering the ripple voltage?in 2 decimal places.arrow_forwardWhat is the type of core material of the transformer? a. Iron O b. Silicon steel O c. Graphite O d. Copperarrow_forwardAnswer only please The resistance of a transformer winding is 0.25 ohm at 25oC. When operating at full load, the temperature of the winding is 75oC. The temperature coefficient of resistance for copper at 0oC is 0.00427 per oC. What is the winding resistance at full load? a. 0.512 ohm b. 0.315 ohm c. 0.298 ohm d. 0.271 ohmarrow_forward
- A voltage transformer in Figure 8 has 1,500 turns of wire on its primary winding and 500 turns of wire for its secondary winding. What will be the turns ratio, a of the transformer. If 240 volts is applied to the primary winding, what will be the resulting secondary voltage. And if a 400 n resistor is connected to the secondary winding, what are the values of current Is and Ip. primary Vp Transformer Core NF Ns Figure 8 secondary Vsarrow_forwardWhat is current transformer? 2 difference between current and potential transformers.arrow_forwardHow does a transformer work in a power system, and what are its applications in voltage conversion?arrow_forward
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