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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)
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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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
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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