Equipment ratings and per-unit reactances for the system shown in the below figure are given as follows: Synchronous generators: GI 100 MVA 25 kV X = X2 = 0.2 Xo = 0.05 G2 100 MVA 13.8 kV X = X2 0.2 Xo = 0.05 Transformers: TI 100 MVA 25/230 kV X = X2 = Xo = 0.05 T2 100 MVA 13.8/230 kV X = X2 = Xo = 0.05 Transmission lines: TL12 100 MVA 230 kV X = X2 = 0.1 Xo = 0.3 TL13 100 MVA 230 kV X = X2 = 0.1 Xo = 0.3 TL23 100 MVA 230 kV X = X2 =0.1 Xo = 0.3 %3D Using a 100-MVA, 230-kV base for the transmission lines, draw the per-unit sequence networks and reduce them to their Thévenin equivalents, "looking in" at bus 3. Neglect A-Y phase shifts. Compute the fault currents for a bolted three-phase fault at bus 3. 2 T2 b T1 TL12 G1 G2 TL13 TL23 j0,03 j0,03

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Equipment ratings and per-unit reactances for the system shown in the below figure are given as
follows:
Synchronous generators:
GI 100 MVA
25 kV
X1 = X2 = 0.2
Xo = 0.05
G2 100 MVA
13.8 kV
X = X2 = 0.2
Xo =0.05
Transformers:
TI 100 MVA
25/230 kV
X = X2 = X, = 0.05
T2 100 MVA
13.8/230 kV
X = X2 = Xo = 0.05
Transmission lines:
TL12 100 MVA
230 kV
X = X2 = 0.1
Xo =0.3
TL13 100 MVA
230 kV
X = X2 = 0.1
Xo = 0.3
%3D
TL23 100 MVA
230 kV
X = X2 = 0.1
Xo = 0.3
%3D
Using a 100-MVA, 230-kV base for the transmission lines, draw the per-unit sequene
networks and reduce them to their Thévenin equivalents, “looking in" at bus 3. Neglect
A-Y phase shifts. Compute the fault currents for a bolted three-phase fault at bus 3.
2
T2 b
T1
TL12
to
G1
G2
TL13
TL23
j0,03
j0,03
3
Transcribed Image Text:Equipment ratings and per-unit reactances for the system shown in the below figure are given as follows: Synchronous generators: GI 100 MVA 25 kV X1 = X2 = 0.2 Xo = 0.05 G2 100 MVA 13.8 kV X = X2 = 0.2 Xo =0.05 Transformers: TI 100 MVA 25/230 kV X = X2 = X, = 0.05 T2 100 MVA 13.8/230 kV X = X2 = Xo = 0.05 Transmission lines: TL12 100 MVA 230 kV X = X2 = 0.1 Xo =0.3 TL13 100 MVA 230 kV X = X2 = 0.1 Xo = 0.3 %3D TL23 100 MVA 230 kV X = X2 = 0.1 Xo = 0.3 %3D Using a 100-MVA, 230-kV base for the transmission lines, draw the per-unit sequene networks and reduce them to their Thévenin equivalents, “looking in" at bus 3. Neglect A-Y phase shifts. Compute the fault currents for a bolted three-phase fault at bus 3. 2 T2 b T1 TL12 to G1 G2 TL13 TL23 j0,03 j0,03 3
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