Q1) Short answer questions: a. (True or False)A double line to ground short circuit fault at phases A and B will have the same magnitude as a double line to ground short circuit fault at phases A and C at the same location. b. How many unique symmetrical components are there for a set of three unbalanced phasors? c. (True or False)Symmetrical components are used to analyze symmetrical faults. d. (True or False) The negative sequence voltage of a generator have the same voltage magnitude and -120° phase shift between each consecutive phases. e. (True or False) The current passing through the zero sequence equivalent of a delta- delta connected three phase transformer in case of a solid double line to ground fault is larger in magnitude than that of a double line to ground fault through a grounding impedance. f. (True or False) The zero sequence components of three phase components are equal in phase but not equal in magnitude. g. When analyzing unbalanced three phase faults in class we always started with two constraints. What were these constraints on? What did the constraint depend on? h. Can we use the double line to ground fault analysis to analyze all double line faults? i. (True or False)A short circuit fault at a specific bus affects the injection current at all busses in the system. j. (True or False) A short circuit fault at a specific bus affects the voltage at all busses in the system.

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Power system analysis
Q1)
Short answer questions:
a. (True or False)A double line to ground short circuit fault at phases A and B will have
the same magnitude as a double line to ground short circuit fault at phases A and Cat
the same location.
b. How many unique symmetrical components are there for a set of three unbalanced
phasors?
c. (True or False)Symmetrical components are used to analyze symmetrical faults.
d. (True or False) The negative sequence voltage of a generator have the same voltage
magnitude and -120° phase shift between each consecutive phases.
e. (True or False) The current passing through the zero sequence equivalent of a delta-
delta connected three phase transformer in case of a solid double line to ground fault
is larger in magnitude than that of a double line to ground fault through a grounding
impedance.
f. (True or False) The zero sequence components of three phase components are equal
in phase but not equal in magnitude.
g. When analyzing unbalanced three phase faults in class we always started with two
constraints. What were these constraints on? What did the constraint depend on?
h. Can we use the double line to ground fault analysis to analyze all double line faults?
i. (True or False) A short circuit fault at a specific bus affects the injection current at all
busses in the system.
j. (True False) A short circuit fault at a specific bus affects the voltage at all busses in
the system.
k. Why is the pre-fault voltage at an unfaulted bus in the system assumed to be the same
as the pre-fault voltage at the faulted bus?
Transcribed Image Text:Q1) Short answer questions: a. (True or False)A double line to ground short circuit fault at phases A and B will have the same magnitude as a double line to ground short circuit fault at phases A and Cat the same location. b. How many unique symmetrical components are there for a set of three unbalanced phasors? c. (True or False)Symmetrical components are used to analyze symmetrical faults. d. (True or False) The negative sequence voltage of a generator have the same voltage magnitude and -120° phase shift between each consecutive phases. e. (True or False) The current passing through the zero sequence equivalent of a delta- delta connected three phase transformer in case of a solid double line to ground fault is larger in magnitude than that of a double line to ground fault through a grounding impedance. f. (True or False) The zero sequence components of three phase components are equal in phase but not equal in magnitude. g. When analyzing unbalanced three phase faults in class we always started with two constraints. What were these constraints on? What did the constraint depend on? h. Can we use the double line to ground fault analysis to analyze all double line faults? i. (True or False) A short circuit fault at a specific bus affects the injection current at all busses in the system. j. (True False) A short circuit fault at a specific bus affects the voltage at all busses in the system. k. Why is the pre-fault voltage at an unfaulted bus in the system assumed to be the same as the pre-fault voltage at the faulted bus?
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