PER-UNIT SYSTEM TUTORIALTutorial 3Draw an impedance diagram for the electric power system shown in Figure 3showing all impedances in per unit on a 100-MVA base. Choose 20 kV as thevoltage base for generator. The three-phase power and line-line ratings aregiven below.X = 9%X = 16%X = 20%X = 9%X = 120 QS = 48MW + j64MVarG1:90MVA20kVT1:80MVA20/200kVT2:80MVA200/20kVG2:90MVA18kVLine:200kVLoad:200kV PER-UNIT SYSTEM TUTORIALTutorial 3Answer:j0.2j0.3 j0.25j0.1j0.0810.75 + j1.0(G1G2Figure 3 – Per-unit impedance diagram for Tutorial 3

The equivalent circuit of a power system is the impedance diagram, in which the various components…

Draw an impedance diagram for the electric power system shown in Figure 3 showing all impedances in per unit on a 100-MVA base. Choose 20 kV as the voltage base for generator. The three-phase power and line-line ratings are given below.

Draw an impedance diagram for the electric power system shown in Figure 3 showing all impedances in per unit on a 100-MVA base. Choose 20 kV as the voltage base for generator. The three-phase power and line-line ratings are given below.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.26MCQ: In per-unit equivalent circuits of practical three-phase transformers, under balanced thr-phase...

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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

PER-UNIT SYSTEM TUTORIAL
Tutorial 3
Draw an impedance diagram for the electric power system shown in Figure 3
showing all impedances in per unit on a 100-MVA base. Choose 20 kV as the
voltage base for generator. The three-phase power and line-line ratings are
given below.
X = 9%
X = 16%
X = 20%
X = 9%
X = 120 Q
S = 48MW + j64MVar
G1:
90MVA
20kV
T1:
80MVA
20/200kV
T2:
80MVA
200/20kV
G2:
90MVA
18kV
Line:
200kV
Load:
200kV

PER-UNIT SYSTEM TUTORIAL
Tutorial 3
Answer:
j0.2
j0.3 j0.25
j0.1
j0.081
0.75 + j1.0
(G1
G2
Figure 3 – Per-unit impedance diagram for Tutorial 3

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