4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the secondary line-to-line voltage is 208 V. Take
4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the secondary line-to-line voltage is 208 V. Take
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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...
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![4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical
single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the
secondary line-to-line voltage is 208 V. Take <Van = 0 as the angle reference. (Note that
and n are on the secondary side. )
a) Calculate the secondary side line currents, Ia, Ib, and Ic (magnitude and angle).
b) Calculate the primary side line currents IA, IB, and the neutral current IN
(magnitude and angle).
c) Calculate the power factor for the "a-b" and "-c" portion of the transformer.
Indicate whether the power factor is leading or lagging.
12.47kV / 208V
3-phase
Load
Ic
60 kVA
20
kVA
PF=0.9
PF=1
(lag)
IB](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3e56de43-1442-468e-8af6-5dd9930fa32d%2F45b5c46d-6065-4f9a-aec1-f9833d9ecd8c%2Fl41kt7w.jpeg&w=3840&q=75)
Transcribed Image Text:4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical
single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the
secondary line-to-line voltage is 208 V. Take <Van = 0 as the angle reference. (Note that
and n are on the secondary side. )
a) Calculate the secondary side line currents, Ia, Ib, and Ic (magnitude and angle).
b) Calculate the primary side line currents IA, IB, and the neutral current IN
(magnitude and angle).
c) Calculate the power factor for the "a-b" and "-c" portion of the transformer.
Indicate whether the power factor is leading or lagging.
12.47kV / 208V
3-phase
Load
Ic
60 kVA
20
kVA
PF=0.9
PF=1
(lag)
IB
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