Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 9, Problem 3RQ
If a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?
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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)
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Chapter 9 Solutions
Electrical Transformers and Rotating Machines
Ch. 9 - How does the National Electrical Code specify that...Ch. 9 - An open-delta three-phase transformer system has...Ch. 9 - If a single-phase load is connected across the two...Ch. 9 - Prob. 4RQCh. 9 - A three-phase transformer connection has a...Ch. 9 - A three-phase transformer bank has the secondary...Ch. 9 - A three-phase transformer bank has the primary and...Ch. 9 - Prob. 8RQ
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- A 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_forwardHow much current will flow in the primary of the transformer in question 4?arrow_forward#2arrow_forward
- No need to explain. Just please answer the 2 questions, thank you.arrow_forwardDC and AC subject: 1. Consider a wire carrying a current in the presence of a magnetic field, and a given flux density of 0.25 T. If the wire is 1.0 m long and carries a 0.5 A current, what is the magnitude of the force induced in the wire? 2. The wire shown is moving in the presence of a magnetic field. With the information given in the figure, determine the magnitude and direction of the induced voltage in the wire. (see the figure below)arrow_forwardIf the load in question 7 is connected in a wye, what would be the line voltage and line current supplying the load?arrow_forward
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