P4. An insulator flashover causes a voltage surge with a peak of 55 kV that travels down one of the phases of a 3-phase 13.8 kV overhead distribution feeder (Zo = 300 per phase). The wave approaches a switch that is normally open. Answer the following: a. What is the peak value of the reflected voltage wave when it encounters the open point kV Close b. The switch connects to an underground cable (Zo = 150 per phase). What would be the magnitude of the reflected wave be if the switch would have been closed when the surge approached? kV C. For part b, what would be the maximum combined wave of the reflected wave and the incoming wave be. k V d. If the switch were a three-way switch and it connected the incoming overhead line to two parallel underground cables (Zo = 150 each), what is the reflection coefficient for wave traveling back on the overhead line?
P4. An insulator flashover causes a voltage surge with a peak of 55 kV that travels down one of the phases of a 3-phase 13.8 kV overhead distribution feeder (Zo = 300 per phase). The wave approaches a switch that is normally open. Answer the following: a. What is the peak value of the reflected voltage wave when it encounters the open point kV Close b. The switch connects to an underground cable (Zo = 150 per phase). What would be the magnitude of the reflected wave be if the switch would have been closed when the surge approached? kV C. For part b, what would be the maximum combined wave of the reflected wave and the incoming wave be. k V d. If the switch were a three-way switch and it connected the incoming overhead line to two parallel underground cables (Zo = 150 each), what is the reflection coefficient for wave traveling back on the overhead line?
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter7: Symmetrical Faults
Section: Chapter Questions
Problem 7.21MCQ
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Transcribed Image Text:P4. An insulator flashover causes a voltage surge with a peak of 55 kV that travels down one of the phases of a
3-phase 13.8 kV overhead distribution feeder (Zo = 300 per phase). The wave approaches a switch that
is normally open. Answer the following:
a. What is the peak value of the reflected voltage wave when it encounters the open point
kV
Close
b. The switch connects to an underground cable (Zo = 150
per phase). What would be the
magnitude of the reflected wave be if the switch would have been closed when the surge
approached?
kV
C.
For part b, what would be the maximum combined wave of the reflected wave and the incoming
wave be.
k V
d. If the switch were a three-way switch and it connected the incoming overhead line to two parallel
underground cables (Zo = 150 each), what is the reflection coefficient for wave traveling back
on the overhead line?
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