For the system shown in figure Q5. а. Determine the three-phase fault power (in MVA) and the short circuit current (in kA) for a three- phase fault on busbar A. b. How could the fault power to both parts of busbar A be reduced without additional capital expenditure? С. For your chosen arrangement what would the new level of three-phase fault power be at busbar A? T2

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 7.15P
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For the system shown in figure Q5.
а.
Determine the three-phase fault power (in MVA) and the short circuit current (in kA) for a three-
phase fault on busbar A.
b. How could the fault power to both parts of busbar A be reduced without additional capital
expenditure?
С.
For your chosen arrangement what would the new level of three-phase fault power be at busbar
A?
T2
30 MVA
132 kV
132/33 kV
A
Grid Supply
X = 0.1 pu
Underground cable
X = 24.3 Q/ph
10,000 MVA fault infeed
*Y
0+
T1
Overhead line
X = 36.45 Q/ph
60 MVA
50 MVA
11 kV
11/132 kV
X = 12 %
X = 11%
figure Q5
Transcribed Image Text:For the system shown in figure Q5. а. Determine the three-phase fault power (in MVA) and the short circuit current (in kA) for a three- phase fault on busbar A. b. How could the fault power to both parts of busbar A be reduced without additional capital expenditure? С. For your chosen arrangement what would the new level of three-phase fault power be at busbar A? T2 30 MVA 132 kV 132/33 kV A Grid Supply X = 0.1 pu Underground cable X = 24.3 Q/ph 10,000 MVA fault infeed *Y 0+ T1 Overhead line X = 36.45 Q/ph 60 MVA 50 MVA 11 kV 11/132 kV X = 12 % X = 11% figure Q5
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