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Q1/ Equipment ratings for the four-bus power system shown in Figure are as follows: Generator G1: 500 MVA, 13.8 kV, X"= 0:20 per unit Generator G2: 750 MVA, 18 kV, X"= 0.18 per unit Generator G3: 1000 MVA, 20 kV, X"-0.17 per unit Transformer T1: 500 MVA, 13.8 A/500Y kV, X=0.12 per unit Transformer T2: 750 MVA, 18 A/500Y kV, X-0.10 per unit Transformer T3: 1000 MVA, 20 A/500Y kV, X 0.10 per unit Each 500-kV line: X1 =50 SN A line to ground short circuit occurs at bus 1, where the pre fault voltage is 525 kV. Pre fault Toad current is neglected. Draw the positive-sequence reactance diagram in per-unit on a 1000- MVA, 20-kVbase in the zone of generator G3. Determine (a) the Thevenin reactance in per- unit at the fault, (b) the sub transient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2. T1 G1 G3 50 N 50 う Son AY YA 50 N Yuw T2 G2

Q1/ Equipment ratings for the four-bus power system shown in Figure are as follows: Generator G1: 500 MVA, 13.8 kV, X"= 0:20 per unit Generator G2: 750 MVA, 18 kV, X"= 0.18 per unit Generator G3: 1000 MVA, 20 kV, X"-0.17 per unit Transformer T1: 500 MVA, 13.8 A/500Y kV, X=0.12 per unit Transformer T2: 750 MVA, 18 A/500Y kV, X-0.10 per unit Transformer T3: 1000 MVA, 20 A/500Y kV, X 0.10 per unit Each 500-kV line: X1 =50 SN A line to ground short circuit occurs at bus 1, where the pre fault voltage is 525 kV. Pre fault Toad current is neglected. Draw the positive-sequence reactance diagram in per-unit on a 1000- MVA, 20-kVbase in the zone of generator G3. Determine (a) the Thevenin reactance in per- unit at the fault, (b) the sub transient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2. T1 G1 G3 50 N 50 う Son AY YA 50 N Yuw T2 G2

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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Q1/ Equipment ratings for the four-bus power system shown in Figure are as follows: Generator G1: 500 MVA, 13.8 kV, X"= 0:20 per unit Generator G2: 750 MVA, 18 kV, X"= 0.18 per unit Generator G3: 1000 MVA, 20 kV, X"-0.17 per unit Transformer T1: 500 MVA, 13.8 A/500Y kV, X=0.12 per unit Transformer T2: 750 MVA, 18 A/500Y kV, X =0.10 per unit Transformer T3: 1000 MVA, 20 A/500Y kV, X=0.10 per unit Each 500-kV line: X1 =50 2 A line to ground short circuit occurs at bus 1, where the pre fault voltage is 525 kV. Pre fault Toad current is neglected. Draw the positive-sequence reactance diagram in per-unit on a 1000- MVA, 20-kV base in the zone of generator G3. Determine (a) the Thevenin reactance in per- unit at the fault, (b) the sub transient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2. T1 2) G1 G3 50 N 50 N AY YA j50 N T2 G2
Transcribed Image Text:Q1/ Equipment ratings for the four-bus power system shown in Figure are as follows: Generator G1: 500 MVA, 13.8 kV, X"= 0:20 per unit Generator G2: 750 MVA, 18 kV, X"= 0.18 per unit Generator G3: 1000 MVA, 20 kV, X"-0.17 per unit Transformer T1: 500 MVA, 13.8 A/500Y kV, X=0.12 per unit Transformer T2: 750 MVA, 18 A/500Y kV, X =0.10 per unit Transformer T3: 1000 MVA, 20 A/500Y kV, X=0.10 per unit Each 500-kV line: X1 =50 2 A line to ground short circuit occurs at bus 1, where the pre fault voltage is 525 kV. Pre fault Toad current is neglected. Draw the positive-sequence reactance diagram in per-unit on a 1000- MVA, 20-kV base in the zone of generator G3. Determine (a) the Thevenin reactance in per- unit at the fault, (b) the sub transient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2. T1 2) G1 G3 50 N 50 N AY YA j50 N T2 G2
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