The power system shown in Figure Q2.2 experiences a three-phase fault at Bus 5. The fault current at the fault point is measured to be 1.2 kA and it is known that the fault impedance is purely reactive (i.e. there is no resistive component). All system parameters are given in the network diagram. Assume that the system is unloaded and operating at its nominal voltage. Use a system base of 100 MVA for your calculations.

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c)
The power system shown in Figure Q2.2 experiences a three-phase fault at Bus 5.
The fault current at the fault point is measured to be 1.2 kA and it is known that the
fault impedance is purely reactive (i.e. there is no resistive component). All system
parameters are given in the network diagram. Assume that the system is unloaded and
operating at its nominal voltage. Use a system base of 100 MVA for your calculations.
External Grid
3
320 MVA
G1
10 kV
30 MVA
Xd" = 0.15 pu
1
T1
ta
2
132/33 kV
70 MVA
10%
T2
a
10/33 kV
40 MVA
10%
L1
0.3 + j0.6 02/km
8 km in length
Figure Q2.2
Calculate the value of the fault impedance in ohms.
T3
5
H
33/11 kV
20 MVA
12%
Transcribed Image Text:c) The power system shown in Figure Q2.2 experiences a three-phase fault at Bus 5. The fault current at the fault point is measured to be 1.2 kA and it is known that the fault impedance is purely reactive (i.e. there is no resistive component). All system parameters are given in the network diagram. Assume that the system is unloaded and operating at its nominal voltage. Use a system base of 100 MVA for your calculations. External Grid 3 320 MVA G1 10 kV 30 MVA Xd" = 0.15 pu 1 T1 ta 2 132/33 kV 70 MVA 10% T2 a 10/33 kV 40 MVA 10% L1 0.3 + j0.6 02/km 8 km in length Figure Q2.2 Calculate the value of the fault impedance in ohms. T3 5 H 33/11 kV 20 MVA 12%
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