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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
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.8P
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I need answers ASAP please
Problem 2.
In this problem, you are going to analvse system, presented on the figure below with
the following ratings.
20 kV
X1 = X2 = 0.2
Machines 1 and 2:
100 MVA
D0'0 = "x
20A/345Y kV
Xo = 0.04
Transformers 1 and 2:
100 MVA
X1 = X2 = Xo = 0.08
O T, 2
3.
Machine 1
Machine 2
A Y
Y A
The system operates with the base of 100 MVA, 345 kV for the transmission line.
On that base, the series reactances of the line are X1=X2=0.2 pu and Xo=0.7 per
unit. With a nominal voltage of 345 kV at bus 3, machine 2 is operating as a motor
drawing 50 MVA at 0.75 lagging pf.
a) Derive equivalent circuits for positive, negative and zero sequence
networks.
b) If the symmetric fault occurs in Bus 4, calculate the fault current.
c) What is the power factor in the receiving end?
Transcribed Image Text:Problem 2. In this problem, you are going to analvse system, presented on the figure below with the following ratings. 20 kV X1 = X2 = 0.2 Machines 1 and 2: 100 MVA D0'0 = "x 20A/345Y kV Xo = 0.04 Transformers 1 and 2: 100 MVA X1 = X2 = Xo = 0.08 O T, 2 3. Machine 1 Machine 2 A Y Y A The system operates with the base of 100 MVA, 345 kV for the transmission line. On that base, the series reactances of the line are X1=X2=0.2 pu and Xo=0.7 per unit. With a nominal voltage of 345 kV at bus 3, machine 2 is operating as a motor drawing 50 MVA at 0.75 lagging pf. a) Derive equivalent circuits for positive, negative and zero sequence networks. b) If the symmetric fault occurs in Bus 4, calculate the fault current. c) What is the power factor in the receiving end?
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