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1- Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 20-kV base in the zone of generator G3. Neglect A -Y transformer phase shifts. 2- Assume that the fault is at bus 1, determine the Thevenin equivalent of cach sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y phase shifts are neglected. 3- Determine the subtransient fault current in per-unit and in kA during a bolted three phase fault at the fault bus (bus 1).

1- Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 20-kV base in the zone of generator G3. Neglect A -Y transformer phase shifts. 2- Assume that the fault is at bus 1, determine the Thevenin equivalent of cach sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y phase shifts are neglected. 3- Determine the subtransient fault current in per-unit and in kA during a bolted three phase fault at the fault bus (bus 1).

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Equipment ratings for the four-bus power system are given as follows: T1 0 3 T3 G3 j50 N |50 1 A Y YA j50 N T2 G2 Generator G1: 500 MVA, 13.8 kV, X"=X= 0.20, Xo = 0.10 per unit Generator G2: 750 MVA, 18 kV, X" =X2 = 0.18, Xo = 0:09 per unit Generator G3: 1000 MVA, 20 kV, X" = 0.17, X2 = 0.20, X, = 0.09 per unit %3D Transformer T1: 500 MVA, 13.8 kV A/500 kV Y, X = 0.12 per unit Transformer T2: 750 MVA, 18 kV A/500 kV Y, X = 0.10 per unit Transformer T3: 1000 MVA, 20 kV A/500 kV Y, X = 0.10 per unit Each line: X1 = 50 ohms, X, = 150 ohms The inductor connected to generator G3 neutral has a reactance of 0.028 2. 1- Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 20-kV base in the zone of generator G3. Neglect A -Y transformer phase shifts. 2- Assume that the fault is at bus 1, determine the Thevenin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y phase shifts are neglected. 3- Determine the subtransient fault current in per-unit and in kA during a bolted three phase fault at the fault bus (bus 1).
Transcribed Image Text:Equipment ratings for the four-bus power system are given as follows: T1 0 3 T3 G3 j50 N |50 1 A Y YA j50 N T2 G2 Generator G1: 500 MVA, 13.8 kV, X"=X= 0.20, Xo = 0.10 per unit Generator G2: 750 MVA, 18 kV, X" =X2 = 0.18, Xo = 0:09 per unit Generator G3: 1000 MVA, 20 kV, X" = 0.17, X2 = 0.20, X, = 0.09 per unit %3D Transformer T1: 500 MVA, 13.8 kV A/500 kV Y, X = 0.12 per unit Transformer T2: 750 MVA, 18 kV A/500 kV Y, X = 0.10 per unit Transformer T3: 1000 MVA, 20 kV A/500 kV Y, X = 0.10 per unit Each line: X1 = 50 ohms, X, = 150 ohms The inductor connected to generator G3 neutral has a reactance of 0.028 2. 1- Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 20-kV base in the zone of generator G3. Neglect A -Y transformer phase shifts. 2- Assume that the fault is at bus 1, determine the Thevenin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y phase shifts are neglected. 3- Determine the subtransient fault current in per-unit and in kA during a bolted three phase fault at the fault bus (bus 1).
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