
Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 21.1, Problem 8R
To determine
Mention whether the plans indicate a wall switch for the controlling operation of a food waste disposer or not.
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The short-circuit test has been carried out on a single-phase transformer of 2500kVA,50kV/10kV, with the following results: 4000V, 50A , 50000 WIt is known that the transformer has a vacuum current equal to 2% and its efficiency at full load fp=1 is 97.5%.
Calculate:
A. Parameters of the excitation branch. Rfe, JXm, Pob. Relative voltage drops. εcc, εrcc, εxcc
Magnetic Field Analysis of a Helical Coil
In this lab you will analyse the inductive coil structure shown in Figure 1. It comprises a solid
round copper wire of radius a = 0.8mm, wound into a cylindrical spiral having N = 20 turns, major
radius R = 10mm and an axial pitch p = 2mm. The coil is excited by a dc current of 1A.
R
P
1
(a) Analytic Calculations
Figure 1: Helical Air-cored Coil
Using the expressions developed in the class, estimate the magnetic flux density B at the centre of
the coil. Recall from EN1216 that for a long solenoid, the flux density is given by:
HONI
B
l
As we saw in the class (see section 4) a modified expression can also be derived that eliminates
the need for the 'long' solenoid assumption:
R
α1
Р
â
B =
HONI
2l
(cosa₂-cosα1)
1
Compare the results obtained using equations (1) and (2) and state which solution you would
expect to give the best approximation to the real coil behaviour.
Chapter 21 Solutions
Electrical Wiring Residential
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