Engineering Electromagnetics
9th Edition
ISBN: 9781260029963
Author: Hayt
Publisher: MCG
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Chapter 12, Problem 12.7P
The semi-infinite regions z < 0 and z > 1m are free space. For 0
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Q2.
a) Two three-phase transformers, designated A and B, have the following
secondary equivalent circuit parameters per phase:
R₁ = 0.002 Q, XA = 0.03 Q, RB = 0.004 Q, X = 0.012 Q
Transformer A is 250 kVA and transformer B is 450 kVA. Calculate how
they share a load of 650 KVA when connected in parallel (assume the
voltage ratios are equal)
b) A step-up transformer is being specified for the beginning of a 3-phase, 4
wire high voltage transmission line. Discuss your recommendation for the
configuration of the transformer connections on both the primary and
secondary side of the transformer.
c)
Define power system protection and describe its fundamental purpose.
Discuss the following key concepts including discrimination, stability,
speed of operation, sensitivity, and reliability in the context of the power
system protection components and schemes.
Q3.
a) Given the unsymmetrical phasors for a three-phase system, they can be
represented in terms of their symmetrical components as follows:
[Fa]
[1 1
Fb = 1 a²
[Fc.
11[Fao]
a Fai
1 a a2F a2-
where F stands for any three-phase quantity. Conversely, the sequence
components can be derived from the unsymmetrical phasors as:
[11 1] [Fal
Faol
Fa1 =
1 a a² F
1 a²
a
a2.
Given the unbalanced three-phase voltages:
V₁ = 120/10° V, V₂ = 200/110° V, V = 240/200° V
Calculate in polar form the sequence components of the voltage.
Complete the table of values for this circuit:
Chapter 12 Solutions
Engineering Electromagnetics
Ch. 12 - Prob. 12.1PCh. 12 - Prob. 12.2PCh. 12 - A uniform plane wave m region 1 is normally...Ch. 12 - Prob. 12.4PCh. 12 - Prob. 12.5PCh. 12 - In the beam-steering prism of Example 12.8,...Ch. 12 - The semi-infinite regions z 0 and z 1m are free...Ch. 12 - Prob. 12.8PCh. 12 - Prob. 12.9PCh. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - Prob. 12.13PCh. 12 - Prob. 12.14PCh. 12 - Prob. 12.15PCh. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - Prob. 12.18PCh. 12 - You are given Four slabs of lossless dielectric,...Ch. 12 - Prob. 12.20PCh. 12 - Prob. 12.21PCh. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Prob. 12.24PCh. 12 - Prob. 12.25PCh. 12 - Show how a single block of glass can be used to...Ch. 12 - Prob. 12.27PCh. 12 - Over a small wavelength range, the refractive...Ch. 12 - Prob. 12.29PCh. 12 - Prob. 12.30P
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