Answered: b) A 20kVA 8000/277V distribution…

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 3.14P: A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down...

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Mechanical Engineering Course, Electrical subject questions! (refer attached pic)

A 20kVA 8000/277V distribution transformer has the following resistances and reactances:
Re
, = 32 ohm
Rs
0.050 ohm
Xp
45 ohm
Xs
0.060 ohm
R. = 250k ohm
XM
30k ohm
The excitation branch impedances are
given referred to the high-voltage
side of the
transformer. Assume that this transformer is supplying rated load at 277 V and 0.85 pf
lagging, determine the following:
=:
Draw and label the equivalent circuit of transformer referred to primary side
in)
Determine its voltage regulation and efficiency.

b)
A 20kVA 8000/277V distribution transformer has the following resistances and reactances:
Rp = 32 02
Xp = 450
Rs = 0.05 0
Xs = 0.06 0 Ω
XM
30k Q
SEMIGHT
Rc = 250k Ω
The excitation branch impedances are given referred to the high-voltage side of the
transformer. Assume that this transformer is supplying rated load at 277 V and 0.85 pf
lagging, determine the following:
i) Draw and label the equivalent circuit of transformer referred to primary side
Determine its voltage regulation and efficiency.
ii)
(12 marks)

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