Answered: 4.- A 20-kVA , 8000 V / 277 V…

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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4.- A 20-kVA , 8000 V / 277 V transformer has the following resistances and
reactance's:
RP = 32Ω RS = 0.05Ω
XP = 45Ω XS = 0.06Ω
RC = 250 KΩ XM = 30 KΩ
The excitation branch impedances are given referred to the high-voltage side of the transformer.
a.- Find the equivalent circuit of this transformer referred to the high-voltage side.
b.- Assume the transformer is supplying rated load at 277 V and 0.8 pf lagging.

Whatis this transformer’s input voltage? (tip: assume the current through XM and RC is very small … negligible)

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Problem 4
4.-A 20-kVA, 8000 V/ 277 V transformer has the following resistances and
reactance's:
Rp = 320 Rs = 0.050
Xp = 450 Xs = 0.060
Rc = 250 KO XM = 30 KQ
%3D
%3D
%3D
%3D
!3D
The excitation branch impedances are given referred to the high-voltage side of the
transformer.
a.- Find the equivalent circuit of this transformer referred to the high-voltage side.
b.- Assume the transformer is supplying rated load at 277 V and 0.8 pf lagging. What
is this transformer's input voltage? (tip: assume the current through X,M and Re is very
small... negligible)
The resulting equivalent circuit is
32 2
45 Q
41.79
50.1 2
250 k2
30 k

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