A delta wye transformer connection is shown in schematic form in Figure 2, This transformer is a step- down arrangement from 4.2kV, line-line, to 480V, line-ine, both RMS. See Figure 3. The resistor on the wye side is drawing 100 A. A b B Figure 2 Transformer Hookup iba lac icb Figue 3: Sngle-Phe Loaded Tranbmer Cnnecetion a) How much power is being drawn on the wye side from each of the three transformer secondaries? b) What is the turn's ratio between the physical transformers that make up the three-phase transformer bank? c) What are the three currents in the primary side of each of the three transformers? Show them in a reasonably proportioned vector diagram. Show the voltages as well across those transformer windings Now the situation is reversed asshowninFigure4. This, too, is a 4.2kV (line-line, RMS) to 480 V transformer, but this time the wye side is on the high voltage and the delta is on the low voltage. A single resistor, drawing 100 A, is connected across two of the terminals of the 600 V secondary. Initially the wye side of the transformer is ungrounded. 1 What is the physical turn's ratio of these transformers? 2. Assuming that the wye side of the transformer is connected to a voltage source, draw currents in the primary windings IA, IB and iC, in relationship to the voltages on the wye side. 3. Show that the sum of real and reactive powers on the wye side matches the same quantities on the delta side. 4. Now the wye side of the transformer is grounded. What changes? ele rele
A delta wye transformer connection is shown in schematic form in Figure 2, This transformer is a step- down arrangement from 4.2kV, line-line, to 480V, line-ine, both RMS. See Figure 3. The resistor on the wye side is drawing 100 A. A b B Figure 2 Transformer Hookup iba lac icb Figue 3: Sngle-Phe Loaded Tranbmer Cnnecetion a) How much power is being drawn on the wye side from each of the three transformer secondaries? b) What is the turn's ratio between the physical transformers that make up the three-phase transformer bank? c) What are the three currents in the primary side of each of the three transformers? Show them in a reasonably proportioned vector diagram. Show the voltages as well across those transformer windings Now the situation is reversed asshowninFigure4. This, too, is a 4.2kV (line-line, RMS) to 480 V transformer, but this time the wye side is on the high voltage and the delta is on the low voltage. A single resistor, drawing 100 A, is connected across two of the terminals of the 600 V secondary. Initially the wye side of the transformer is ungrounded. 1 What is the physical turn's ratio of these transformers? 2. Assuming that the wye side of the transformer is connected to a voltage source, draw currents in the primary windings IA, IB and iC, in relationship to the voltages on the wye side. 3. Show that the sum of real and reactive powers on the wye side matches the same quantities on the delta side. 4. Now the wye side of the transformer is grounded. What changes? ele rele
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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Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
Question
Transcribed Image Text:A deita wye transformer connection is shown in schematic form in Figure 2, This transformer is a step-
down arrangement from 4.2kV, line-line, to 480V, line-ine, both RMS. See Figure 3. The resistor on the
wye side is drawing 100 A.
b
Figure 2 Transformer Hookup
iba
b.
lac
Fizune 3: Single-Phve Loaded Trafoer Connecetion
a) How much power is being drawn on the wye side from each of the three transformer secondaries?
b) What is the turn's ratio between the physical transformers that make up the three-phase
transformer bank?
c) What are the three currents in the primary side of each of the three transformers? Show them in a
reasonably proportioned vector diagram. Show the voltages as well across those transformer
windings.
Now the situation is reversed asshowninFigure4. This, too, is a 4.2kV (line-line, RMS) to 480 V transformer,
but this time the wye side is on the high voltage and the delta is on the low voltage. A single resistor,
drawing 100 A, is connected across two of the terminals of the 600 V secondary. Initially the wye side of
the transformer is ungrounded.
1 What is the physical turn's ratio of these transformers?
2. Assuming that the wye side of the transformer is connected to a voltage source, draw currents in the
primary windings IA, IB and iC, in relationship to the voltages on the wye side.
3. Show that the sum of real and reactive powers on the wye side matches the same quantities on the
delta side.
4. Now the wye side of the transformer is grounded. What changes?
rele
ele
ele
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