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Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: X-Y 15 MVA, 13.8/138 kV, leakage reactance 10% Y-Z 15 MVA, 138/69 kV, leakage reactance 8% With the base in circuit Y chosen as 15 MVA, 138 kV, determine the per-unit im- pedance of the 500 Q resistive load in circuit Z, referred to circuits Z, Y, and X. Ne- glecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.

Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: X-Y 15 MVA, 13.8/138 kV, leakage reactance 10% Y-Z 15 MVA, 138/69 kV, leakage reactance 8% With the base in circuit Y chosen as 15 MVA, 138 kV, determine the per-unit im- pedance of the 500 Q resistive load in circuit Z, referred to circuits Z, Y, and X. Ne- glecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.

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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Subject: Power

Book Name: Power System Analysis and Design,. Fifth Edition. J. Duncan Glover, Mulukutla S. Sarma, and Thomas J

Page: 147

problem no: 3.25

3.25 Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: X-Y 15 MVA, 13.8/138 kV, leakage reactance 10% Y-Z 15 MVA, 138/69 kV, leakage reactance 8% With the base in circuit Y chosen as 15 MVA, 138 kV, determine the per-unit im- pedance of the 500 Q resistive load in circuit Z, referred to circuits Z, Y, and X. Ne- glecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit. FIGURE 3.33 1:10 2:1 Single-phase electric ystem for Problem 3.25 Y 500 N X- Y Y-Z u
Transcribed Image Text:3.25 Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: X-Y 15 MVA, 13.8/138 kV, leakage reactance 10% Y-Z 15 MVA, 138/69 kV, leakage reactance 8% With the base in circuit Y chosen as 15 MVA, 138 kV, determine the per-unit im- pedance of the 500 Q resistive load in circuit Z, referred to circuits Z, Y, and X. Ne- glecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit. FIGURE 3.33 1:10 2:1 Single-phase electric ystem for Problem 3.25 Y 500 N X- Y Y-Z u
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