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4. When a generator has terminal a open and the other two terminals are connected to each other with a short circuit from the connection to ground, typical values for the symmetrical components of current in phase a are Ia (1) = 600/-90°, Ia(2) - 250/90°and Ia (0)= 350/90°A. Find the current into the ground a. 1700 A b. 1920 A c. j1050 A d. ji180 A

4. When a generator has terminal a open and the other two terminals are connected to each other with a short circuit from the connection to ground, typical values for the symmetrical components of current in phase a are Ia (1) = 600/-90°, Ia(2) - 250/90°and Ia (0)= 350/90°A. Find the current into the ground a. 1700 A b. 1920 A c. j1050 A d. ji180 A

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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4. When a generator has terminal a open and the other two terminals are connected to each other with a short circuit from the connection to ground, typical values for the symmetrical components of current in phase a are Ia (1) = 600/-90°, Ia(2) - 250/90°and Ia (0)= 350/90°A. Find the current into the ground a. 1700 A b. 1920 A c. j1050 A d. j1180 A
Transcribed Image Text:4. When a generator has terminal a open and the other two terminals are connected to each other with a short circuit from the connection to ground, typical values for the symmetrical components of current in phase a are Ia (1) = 600/-90°, Ia(2) - 250/90°and Ia (0)= 350/90°A. Find the current into the ground a. 1700 A b. 1920 A c. j1050 A d. j1180 A
5. A generator is rated 500 MVA, 22 kv. The positive, negative and zero sequence components of the generator are 0.20, 0.20 and 0.05 per unit respectively. What is the ratio of the fault current for a single line to ground fault to the fault current for a three-phase fault? а. 1.50 b. 1.42 с. 1.33 d. 1.25 6. A 30 MVA generator with 15% reactance is connected to a bus bar. A 25 MVA transformer with 10% reactance is also connected through a 10% bus bar reactor to the same bus bar. Both of these reactance is based on 25 MVA. If a feeder taken out from the bus bars through a circuit breaker develops a three-phase fault, what should be the appropriate rating of the circuit breaker? a. 923 MVA b. 325 MVA c. 675 MVA d. 500 MVA
Transcribed Image Text:5. A generator is rated 500 MVA, 22 kv. The positive, negative and zero sequence components of the generator are 0.20, 0.20 and 0.05 per unit respectively. What is the ratio of the fault current for a single line to ground fault to the fault current for a three-phase fault? а. 1.50 b. 1.42 с. 1.33 d. 1.25 6. A 30 MVA generator with 15% reactance is connected to a bus bar. A 25 MVA transformer with 10% reactance is also connected through a 10% bus bar reactor to the same bus bar. Both of these reactance is based on 25 MVA. If a feeder taken out from the bus bars through a circuit breaker develops a three-phase fault, what should be the appropriate rating of the circuit breaker? a. 923 MVA b. 325 MVA c. 675 MVA d. 500 MVA
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