7. Three single-phase, three-winding transformers are connected for three-phase operation as shown. The following data were obtained on test. Short-Circuit Test Winding Excited Winding Excited S.C. V A Primary Secondary 525 600 Primary Tertiary 1220 601 Secondary Tertiary 4132 120 a) Draw the per unit equivalent circuit of the transformer using 15 MVA and 13.8 kV base at the primary winding (neglect the magnetizing reactance and the winding resistance). b) If a three-phase short circuit should occur at the terminals of the tertiary windings when the transformer is at no load and rated primary voltage, find the per unit values of the steady-state short circuit current and the voltage at the secondary terminals. c) With tertiary supplies a load at its rated current and voltage and 0.8 p.f. lagging and the secondary is at no-load, find the voltage regulation. 3 15 MVA, 13.8 kV Primary Yuu Secondary 15 MVA, 69 kV 5.25 MVA, 4.8 kV ww▲ Tertiary Y

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 3.34P: Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance...
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7. Three single-phase, three-winding transformers are connected for three-phase
operation as shown. The following data were obtained on test.
Short-Circuit Test
Winding
Excited Winding
Excited
S.C.
V
A
Primary
Secondary
525
600
Primary
Tertiary
1220
601
Secondary
Tertiary
4132
120
a) Draw the per unit equivalent circuit of the transformer using 15 MVA and
13.8 kV base at the primary winding (neglect the magnetizing reactance and
the winding resistance).
b) If a three-phase short circuit should occur at the terminals of the tertiary
windings when the transformer is at no load and rated primary voltage, find
the per unit values of the steady-state short circuit current and the voltage at
the secondary terminals.
c) With tertiary supplies a load at its rated current and voltage and 0.8 p.f.
lagging and the secondary is at no-load, find the voltage regulation.
3
15 MVA, 13.8 kV
Primary Yuu
Secondary
15 MVA, 69 kV
5.25 MVA, 4.8 kV
ww▲ Tertiary
Y
Transcribed Image Text:7. Three single-phase, three-winding transformers are connected for three-phase operation as shown. The following data were obtained on test. Short-Circuit Test Winding Excited Winding Excited S.C. V A Primary Secondary 525 600 Primary Tertiary 1220 601 Secondary Tertiary 4132 120 a) Draw the per unit equivalent circuit of the transformer using 15 MVA and 13.8 kV base at the primary winding (neglect the magnetizing reactance and the winding resistance). b) If a three-phase short circuit should occur at the terminals of the tertiary windings when the transformer is at no load and rated primary voltage, find the per unit values of the steady-state short circuit current and the voltage at the secondary terminals. c) With tertiary supplies a load at its rated current and voltage and 0.8 p.f. lagging and the secondary is at no-load, find the voltage regulation. 3 15 MVA, 13.8 kV Primary Yuu Secondary 15 MVA, 69 kV 5.25 MVA, 4.8 kV ww▲ Tertiary Y
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