7. A system operates at 220 kVA and 11 kV. Using these quantities as base values, find the base impedance for the system. a. 200 b. 100n c. 5500 d. 34.640 8. Three6.6 kV, 12 MVA, 3-phase alternators are connected to
7. A system operates at 220 kVA and 11 kV. Using these quantities as base values, find the base impedance for the system. a. 200 b. 100n c. 5500 d. 34.640 8. Three6.6 kV, 12 MVA, 3-phase alternators are connected to
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.25MCQ: In developing per-unit equivalent circuits for three-phase transformers. under balanced three-phase...
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answer 7 and 8
![7. A system operates at 220 KVA and 11 kV. Using these
quantities as base values, find the base impedance for the
system.
a. 200
b. 100n
c. 5500
d. 34.640
8. Three 6.6 kv, 12 MVA, 3-phase alternators are connected to
a common bus bars. Each has reactance to positive sequence
current of 15%. The reactance to negative and zero sequence
current are 75% and 30% of the positive sequence value. If
an earth fault occurs on one of bus bar, determine the
fault current when one of the alternator neutral is earthed
through a resistance of 0.25 ohm and the others are
isolated.
a. 30,813 A
b. 18,625 A
c. 23,717 A
d. 12,844 A](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F61b55f68-4b60-4f66-8625-3f77eca3719b%2F8c6c03af-236f-4e99-8891-2f154bb87c1c%2F7zznux_processed.png&w=3840&q=75)
Transcribed Image Text:7. A system operates at 220 KVA and 11 kV. Using these
quantities as base values, find the base impedance for the
system.
a. 200
b. 100n
c. 5500
d. 34.640
8. Three 6.6 kv, 12 MVA, 3-phase alternators are connected to
a common bus bars. Each has reactance to positive sequence
current of 15%. The reactance to negative and zero sequence
current are 75% and 30% of the positive sequence value. If
an earth fault occurs on one of bus bar, determine the
fault current when one of the alternator neutral is earthed
through a resistance of 0.25 ohm and the others are
isolated.
a. 30,813 A
b. 18,625 A
c. 23,717 A
d. 12,844 A
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