The figure below shows the one-line diagram of a three-phase power system. By selecting a common baseof 232.9 MVA and 23 kV on the generator side, draw an impedance diagram showing all impedancesincluding the load impedance in per-unit. The data are given as follows: [assume all transformers have thesame connection ^ so neglect the phase shifts associated with the the transformers]T₁25Line 1220 kVLine 2110 kV36T₂T₁4MLoadG:TV. 50 MVA90 MVAT2: 40 MVAT3:7\:M:40 MVA40 MVA66.5 MVA25 KV25/225KV225/11KV25/110KV110/11KV12 KVx = 0.18 per unitx = 0.10 per unitx = 0.06 per unitx = 0.064 per unitx = 0.08 per unit0.185 per unitLines 1 and 2 have a series reactance of 50 and 70 fl, respectively. At bus 4, the three-phase load absorbs 75 MVAat 12 kV and 0.7 power factor lagging.

In this question we need to draw a per unit impedance diagram of the given system.

The figure below shows the one-line diagram of a three-phase power system. By selecting a common base of 232.9 MVA and 23 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given as follows: [assume all transformers have the same connection^ so neglect the phase shifts associated with the the transformers] G 2 Line 1 220 kV Line 2 110 kV M Load G: TV 90 MVA M: 50 MVA T2: 40 MVA T3: 40 MVA 7: 40 MVA 66.5 MVA 25 KV 25/225 KV 225/11 KV 25/110 KV 110/11 KV 12 KV x= 0.18 per unit x= 0.10 per unit x = 0.06 per unit x = 0.064 per unit x=0.08 per unit x= 0.185 per unit Lines 1 and 2 have a series reactance of 50 and 70 fl, respectively. At bus 4, the three-phase load absorbs 75 MVA at 12 kV and 0.7 power factor lagging.

The figure below shows the one-line diagram of a three-phase power system. By selecting a common base of 232.9 MVA and 23 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given as follows: [assume all transformers have the same connection^ so neglect the phase shifts associated with the the transformers] G 2 Line 1 220 kV Line 2 110 kV M Load G: TV 90 MVA M: 50 MVA T2: 40 MVA T3: 40 MVA 7: 40 MVA 66.5 MVA 25 KV 25/225 KV 225/11 KV 25/110 KV 110/11 KV 12 KV x= 0.18 per unit x= 0.10 per unit x = 0.06 per unit x = 0.064 per unit x=0.08 per unit x= 0.185 per unit Lines 1 and 2 have a series reactance of 50 and 70 fl, respectively. At bus 4, the three-phase load absorbs 75 MVA at 12 kV and 0.7 power factor lagging.

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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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

The figure below shows the one-line diagram of a three-phase power system. By selecting a common base
of 232.9 MVA and 23 kV on the generator side, draw an impedance diagram showing all impedances
including the load impedance in per-unit. The data are given as follows: [assume all transformers have the
same connection ^ so neglect the phase shifts associated with the the transformers]
T₁
2
5
Line 1
220 kV
Line 2
110 kV
3
6
T₂
T₁
4
M
Load
G:
TV. 50 MVA
90 MVA
T2: 40 MVA
T3:
7\:
M:
40 MVA
40 MVA
66.5 MVA
25 KV
25/225
KV
225/11
KV
25/110
KV
110/11
KV
12 KV
x = 0.18 per unit
x = 0.10 per unit
x = 0.06 per unit
x = 0.064 per unit
x = 0.08 per unit
0.185 per unit
Lines 1 and 2 have a series reactance of 50 and 70 fl, respectively. At bus 4, the three-phase load absorbs 75 MVA
at 12 kV and 0.7 power factor lagging.

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