Q5. The single-line diagram of an unloaded power system is shown in Fig.(3). The reactances of the power system elements (based on a common MVA base) are : Generator 1: 50 MVA, 13.8 kV, Xa"=0.5 pu , XGI=0.3 pu , XG1=0.2 pu , Xni=0.08 pu Generator 2 :50 MVA, 13.8 kV, Xa"=0.333 pu ,XG2)=0.15 pu , XG2=0.11 pu Generator 3: 50 MVA, 22 kV, Xa"=0.275 pu, XG3=0.16 pu , XG30)=0.09 pu , Xn3=0.06 pu Transformer T1: 50 MVA, 220 Y/13.8 A kV, XT1=20%, XT10=10%, Transformer T2: 50 MVA, 220 Y/13.8 A kV, XT2"=16.66%, XT2=10%, Transformer T3: 50 MVA, 220 Y/22 Y kV, XT3(1)=14.38%, XT3=10%, Line 1 : 220 kV, XLine 1=0.1033 pu, XLine 10=0.54 pu Line 2 : 220 kv, XLine 2=0.0826 pu, XLine 20=0.27 pu Find the fault current in amperes when a a double line to ground fault occurs at phase b & phase c (at point A) T1 C Line 2 Line 1 E G1 G2 ulu T3 Fig. 3 D G3 人以 B.

Power System Analysis and Design (MindTap Course List)
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ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter2: Fundamentals
Section: Chapter Questions
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Q5. The single-line diagram of an unloaded power system is shown in Fig.(3). The reactances of the
power system elements (based on a common MVA base) are :
Generator 1: 50 MVA, 13.8 kV, Xa"=0.5 pu , XG1=0.3 pu , XG1®=0.2 pu , Xnl=0.08 pu
Generator 2 :50 MVA, 13.8 kV, Xa"=0.333 pu , XG2)=0.15 pu , XG2®=0.11 pu
Generator 3: 50 MVA, 22 kV, Xa"=0.275 pu, XG32)-0.16 pu , XG3(0)-0.09 pu , Xn3=0.06 pu
Transformer T1: 50 MVA, 220 Y/13.8 A kV, XT1"=20%, XT1®=10%,
Transformer T2: 50 MVA, 220 Y/13.8 A kV, XT2=16.66%, Xr2=10%,
Transformer T3: 50 MVA, 220 Y/22 Y kV, XT30)=14.38%, XT30=10%,
Line 1 : 220 kv, XLine 1=0.1033 pu, XLine 10=0.54 pu
Line 2 : 220 kV, XLine 20)=0.0826 pu, XLine 20=0.27 pu
Find the fault current in amperes when a a double line to ground fault occurs at phase b & phase c (at
point A)
T1
C
T2
A
B
Line 2
Line 1
E
F
G1
G2
mm T3
Fig. 3
G3
Transcribed Image Text:Q5. The single-line diagram of an unloaded power system is shown in Fig.(3). The reactances of the power system elements (based on a common MVA base) are : Generator 1: 50 MVA, 13.8 kV, Xa"=0.5 pu , XG1=0.3 pu , XG1®=0.2 pu , Xnl=0.08 pu Generator 2 :50 MVA, 13.8 kV, Xa"=0.333 pu , XG2)=0.15 pu , XG2®=0.11 pu Generator 3: 50 MVA, 22 kV, Xa"=0.275 pu, XG32)-0.16 pu , XG3(0)-0.09 pu , Xn3=0.06 pu Transformer T1: 50 MVA, 220 Y/13.8 A kV, XT1"=20%, XT1®=10%, Transformer T2: 50 MVA, 220 Y/13.8 A kV, XT2=16.66%, Xr2=10%, Transformer T3: 50 MVA, 220 Y/22 Y kV, XT30)=14.38%, XT30=10%, Line 1 : 220 kv, XLine 1=0.1033 pu, XLine 10=0.54 pu Line 2 : 220 kV, XLine 20)=0.0826 pu, XLine 20=0.27 pu Find the fault current in amperes when a a double line to ground fault occurs at phase b & phase c (at point A) T1 C T2 A B Line 2 Line 1 E F G1 G2 mm T3 Fig. 3 G3
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