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Draw the impedance diagram with all reactances marked in per unit. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1.

Draw the impedance diagram with all reactances marked in per unit. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1.

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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1. The one-line diagram of an unloaded power system is shown below. Reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows: Generator 1: 20 MVA, 13.8 kV, X = 0.20 p.u Generator 2: 30 MVA, 18 kV, X = 0.20 p.u Generator 3: 30 MVA, 20 kV, X = 0.20 p.u Transformer T1: 25 MVA, 220Y/13.8A kV, X = 10% Transformer T2: Three single-phase units each rated 10 MVA, 127/18 kV, X = 10% HT sides connected in wye LT sides connected in delta Transformer T3: 35 MVA, 220Y/22Y kV, X = 10% j80 2 j100 0 Line 1 Line 2 T T2 Draw the impedance diagram with all reactances marked in per unit. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1. 2. For the electric power system shown in the figure below, draw the impedance diagram with all impedance marked in per unit. Choose 100 MVA, 20-kV as base in the generator 1 circuit. The three-phase power and line-line ratings are given below: G1: 90 MVA, 20kV,X = 9% T1:80 MVA, 20/200 kV, X = 16% T2:80 MVA, 200/20 kV, X = 20% G2: 90 MVA, 18 kV, X = 9% Line: 200 kV, X = 120 0 Load: 48 + j64 MVA, 200 kV Line BO G2 T2 Load
Transcribed Image Text:1. The one-line diagram of an unloaded power system is shown below. Reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows: Generator 1: 20 MVA, 13.8 kV, X = 0.20 p.u Generator 2: 30 MVA, 18 kV, X = 0.20 p.u Generator 3: 30 MVA, 20 kV, X = 0.20 p.u Transformer T1: 25 MVA, 220Y/13.8A kV, X = 10% Transformer T2: Three single-phase units each rated 10 MVA, 127/18 kV, X = 10% HT sides connected in wye LT sides connected in delta Transformer T3: 35 MVA, 220Y/22Y kV, X = 10% j80 2 j100 0 Line 1 Line 2 T T2 Draw the impedance diagram with all reactances marked in per unit. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1. 2. For the electric power system shown in the figure below, draw the impedance diagram with all impedance marked in per unit. Choose 100 MVA, 20-kV as base in the generator 1 circuit. The three-phase power and line-line ratings are given below: G1: 90 MVA, 20kV,X = 9% T1:80 MVA, 20/200 kV, X = 16% T2:80 MVA, 200/20 kV, X = 20% G2: 90 MVA, 18 kV, X = 9% Line: 200 kV, X = 120 0 Load: 48 + j64 MVA, 200 kV Line BO G2 T2 Load
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