2) Draw equivalent diagram for this network with all per unit resistances and reactance near their respective elements 3) Calculate symmetrical rms short circuit current for the fault at bus 4. Use only first cycle data.

Introductory Circuit Analysis (13th Edition)
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1) Prepare data for fault analysis of the system
(see figure below). Recommended base MVA is
10 MVA.
3-phase Fault: SCA MVA = 1000 at 138 kV
138 kV bus
Transformer TI 138/13.8 kV
5 MVA, Z- 8%. X/R = 13
13.8 kV bus
Transformer T2 13.8/2.4 kV
2.4 MVA, Z- 5.5 %, X/R = 10
MI
Sync. Motor, 13.2 kV
1000 HP @ 0.8 PF
X/R = 25, X" - 0.15 pu
Aluminum Cable 900 feet
X- 0.0380 Ohms/1000 feet
R- 0.0547 Ohms/1000 feet
2.4 kV bus
Fault
2.3 kV, 1000 HP
Induction, X/R = 25
X" - 0.17 pu
2.3 kV, 750 HP Induction
X/R - 19
X - 0.17 pu
M2
M3
2) Draw equivalent diagram for this network with
all per unit resistances and reactance near their
respective elements
3) Са
for the fault at bus 4. Use only first cycle data.
ate symmetrical rms short circuit current
Transcribed Image Text:1) Prepare data for fault analysis of the system (see figure below). Recommended base MVA is 10 MVA. 3-phase Fault: SCA MVA = 1000 at 138 kV 138 kV bus Transformer TI 138/13.8 kV 5 MVA, Z- 8%. X/R = 13 13.8 kV bus Transformer T2 13.8/2.4 kV 2.4 MVA, Z- 5.5 %, X/R = 10 MI Sync. Motor, 13.2 kV 1000 HP @ 0.8 PF X/R = 25, X" - 0.15 pu Aluminum Cable 900 feet X- 0.0380 Ohms/1000 feet R- 0.0547 Ohms/1000 feet 2.4 kV bus Fault 2.3 kV, 1000 HP Induction, X/R = 25 X" - 0.17 pu 2.3 kV, 750 HP Induction X/R - 19 X - 0.17 pu M2 M3 2) Draw equivalent diagram for this network with all per unit resistances and reactance near their respective elements 3) Са for the fault at bus 4. Use only first cycle data. ate symmetrical rms short circuit current
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