A three-phase synchronous generator is connected to a step-up 3¢ transformer T1, which isconnected to a 60 km transmission line. At the far end of the line, a step-down transformerbank T2 is connected. The secondary of T2 supplies two synchronous motor loads M1 andM2. The ratings of the equipment are as follows:10 MVA,12 MVA, 13.8/138 kV,12 MVA,4 MVA,3 MVA,X = 30%,X = 10%,X = 9%,X = 25%,X = 30%,X = 0.3 2/kmGen:13.8 kV,wyedelta-wyewye-deltaT1:138/12 kV,12 kV,12 kV,138 kV,T2:M1:wyeM2:wye%3|T-line:(a) Draw the per-phase equivalent circuit of the system showing all reactances inand the base voltages used at various parts of the network. Choose the generator ratingsas bases in the generator circuit.perunit(b) For a three-phase fault on the low-voltage terminals of transformer T2, calculate thesteady-state short-circuit current magnitude in amperes supplied by the generator as-suming that all internal voltages are 1.020° pu. Ignore the motor contributions to thefault current for now.

Answered: Image /qna-images/answer/16cb82bb-11a7-4630-a02e-648f4f7fe6e7.jpg

A three-phase synchronous generator is connected to a step-up 3¢ transformer T1, which is connected to a 60 km transmission line. At the far end of the line, a step-down transformer bank T2 is connected. The secondary of T2 supplies two synchronous motor loads M1 and M2. The ratings of the equipment are as follows: 10 MVA, 13.8 kV, 12 MVA, 13.8/138 kV, 138/12 kV, 12 kV, 12 kV, 138 kV, X = 30%, X = 10%, X = 9%, X = 25%, X = 30%, X = 0.3 N/km Gen: wye T1: T2: M1: 12 MVA, 4 MVA, 3 MVA, delta-wye wye-delta wye M2: wye T-line: %3| (a) Draw the per-phase equivalent circuit of the system showing all reactances in and the base voltages used at various parts of the network. Choose the generator ratings as bases in the generator circuit. per unit (b) For a three-phase fault on the low-voltage terminals of transformer T2, calculate the steady-state short-circuit current magnitude in amperes supplied by the generator as- suming that all internal voltages are 1.0° pu. Ignore the motor contributions to the fault current for now.

A three-phase synchronous generator is connected to a step-up 3¢ transformer T1, which is connected to a 60 km transmission line. At the far end of the line, a step-down transformer bank T2 is connected. The secondary of T2 supplies two synchronous motor loads M1 and M2. The ratings of the equipment are as follows: 10 MVA, 13.8 kV, 12 MVA, 13.8/138 kV, 138/12 kV, 12 kV, 12 kV, 138 kV, X = 30%, X = 10%, X = 9%, X = 25%, X = 30%, X = 0.3 N/km Gen: wye T1: T2: M1: 12 MVA, 4 MVA, 3 MVA, delta-wye wye-delta wye M2: wye T-line: %3| (a) Draw the per-phase equivalent circuit of the system showing all reactances in and the base voltages used at various parts of the network. Choose the generator ratings as bases in the generator circuit. per unit (b) For a three-phase fault on the low-voltage terminals of transformer T2, calculate the steady-state short-circuit current magnitude in amperes supplied by the generator as- suming that all internal voltages are 1.0° pu. Ignore the motor contributions to the fault current for now.

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

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.

Question

A three-phase synchronous generator is connected to a step-up 3¢ transformer T1, which is
connected to a 60 km transmission line. At the far end of the line, a step-down transformer
bank T2 is connected. The secondary of T2 supplies two synchronous motor loads M1 and
M2. The ratings of the equipment are as follows:
10 MVA,
12 MVA, 13.8/138 kV,
12 MVA,
4 MVA,
3 MVA,
X = 30%,
X = 10%,
X = 9%,
X = 25%,
X = 30%,
X = 0.3 2/km
Gen:
13.8 kV,
wye
delta-wye
wye-delta
T1:
138/12 kV,
12 kV,
12 kV,
138 kV,
T2:
M1:
wye
M2:
wye
%3|
T-line:
(a) Draw the per-phase equivalent circuit of the system showing all reactances in
and the base voltages used at various parts of the network. Choose the generator ratings
as bases in the generator circuit.
per
unit
(b) For a three-phase fault on the low-voltage terminals of transformer T2, calculate the
steady-state short-circuit current magnitude in amperes supplied by the generator as-
suming that all internal voltages are 1.020° pu. Ignore the motor contributions to the
fault current for now.

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