Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 9RQ
A CT has a current flow of 80 amperes in its primary winding and a current of 2 amperes in its secondary winding. What is the ratio of the CT?
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What is the peak voltage of a 120V RMS AC voltage?
Question 2 Calculate the amount of DC current required for the magnetic circuit given below to generate a
flux density of 1.0 T in the airgap. The details are
Number of turns, N = 400
The core is made up of steel, the B-H characteristic has been given below
The magnetic core length, le = 500 mm
The airgap length, Ig = 2 mm
The cross-sectional area of the core, Ag = 100 mm²
Neglect leakage and fringing.
Core
Cross-sectional
i(1)
area
as
Air gap
Magnetic path
length
Figure 1
2.0
1.8
B-H Curves for Various Metals
Steel
1.6
1.4
Magnetic
Saturation
1.2
1.0
0.8
Iron
근 0.4
Air
0.2
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Magnetic Field Strength - H (A/m)
Figure 2
Flux Density - B (T)
Match the following:
Alternating current
Alternations
Cycle
Half cycle
Period
a. One alternation
b. The positive and negative transitions
c. Any current that periodically changes direction
d. The complete transition through one positive alternation and one negative
alternation
e. The time required to complete one cycle of an AC waveform
Chapter 6 Solutions
Electrical Transformers and Rotating Machines
Ch. 6 - Prob. 1RQCh. 6 - What is the standard current rating for the...Ch. 6 - Why should the secondary winding of a CT never be...Ch. 6 - A current transformer has a ratio of 600:5. If...Ch. 6 - Assume that a primary current of 75 amperes flows...Ch. 6 - What type of core is generally used in the...Ch. 6 - A current transformer has 4 turns of wire in its...Ch. 6 - Prob. 8RQCh. 6 - A CT has a current flow of 80 amperes in its...Ch. 6 - What is the most common use for a CT?
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A current transformer has a ratio of 600:5. If three loops of wire are wound through the transformer core, how much primary current is required to produce 5 amperes of current in the secondary winding?arrow_forwardA current transformer has 4 turns of wire in its primary winding. How many turns of wire are needed in the secondary winding to produce a current of 2 amperes when a current of 60 amperes flows in the primary winding?arrow_forwardAssume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?arrow_forward
- How many lines of magnetic flux must be cut in 1 s to induce a voltage of 1 V?arrow_forwardThree inductors are connected in parallel. Inductor 1 has an inductance of 0.06 H; inductor 2 has an inductance of 0.05 H; and inductor 3 has an inductance of 0.1 H. What is the total inductance of this circuit?arrow_forwardFour inductors, each having an inductance of 0.6 H, are connected in series. What is the total inductance of the circuit?arrow_forward
- If the secondary of the transformer in question 5 supplies a current of 9.6 amperes to a load, what is the primary current? (Disregard excitation current.)arrow_forwardA transformer has a turns ratio of 1:6. The primary current is 18 amperes. What is the secondary current?arrow_forwardAn AC power source is connected across 325 turns of an autotransformer, and the load is connected across 260 turns. What is the turns ratio of this transformer?arrow_forward
- How much current is flowing in the secondary winding?arrow_forwardWhat is the standard current rating for the secondary winding of a CT?arrow_forwardA load impedance of 52 Ω is connected to the secondary winding of the transformer in question 3. How much current will flow in the secondary?arrow_forward
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