EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Textbook Question
Chapter 1, Problem 9R
Name two nationally recognized testing laboratories. __________
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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 1 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 1 - Prob. 1RCh. 1 - Prob. 2RCh. 1 - Does the NEC provide minimum or maximum standards?...Ch. 1 - What do the letters UL signify?Ch. 1 - What section of the NEC states that all listed or...Ch. 1 - Prob. 6RCh. 1 - Prob. 7RCh. 1 - Does compliance with the NEC always result in an...Ch. 1 - Name two nationally recognized testing...Ch. 1 - Prob. 10R
Ch. 1 - Prob. 12RCh. 1 - A junction box on a piece of European equipment is...Ch. 1 - Prob. 14RCh. 1 - You will learn in Chapter 3 that residential...Ch. 1 - Prob. 16RCh. 1 - What can you do to reduce or eliminate the...Ch. 1 - What is the NEC definition of a qualified person?Ch. 1 - Are low-voltage systems totally safe? Explain.Ch. 1 - Prob. 21RCh. 1 - What do the letters PPE stand for?...Ch. 1 - Prob. 23RCh. 1 - Where might you obtain information about...Ch. 1 - Prob. 25R
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