Q2) In the network in the figure below Y-Y connected transformers, each with grounded neutrals, are at the ends of each transmission line that is not terminating at bus 3. The transformers connecting the lines to bus 3 are Y-A, with the neutral of the Y solidly grounded and the A sides connected to bus 3. All the line reactances shown in the figure between busses include the reactances of the transformers. Zero sequence values for these lines including transformers are 2.0 times those shown in the figure. Both generators are Y-Connected. Zero-sequence reactances of the generators connected to bus 1 and bus 3 are 0.04 and 0.08 per unit, respectively. The neutral of the generator at bus 1 is connected to ground through a reactor of 0.02 per unit; the generator at bus 3 has a solidly ground neutral. (2) (0) Find the bus impedance matrices ZS, Z, Zus for the given network and bus bus then compute the Subtransient current in per unit for a single line-to-ground fault on bus 2 and the fault current contribution flowing in the transmission line connected busses 1 and 2. Assume no pre-fault current is flowing and all pre-fault voltages at all the buses is 1/0° per unit.

Q2) In the network in the figure below Y-Y connected transformers, each with grounded neutrals, are at the ends of each transmission line that is not terminating at bus 3. The transformers connecting the lines to bus 3 are Y-A, with the neutral of the Y solidly grounded and the A sides connected to bus 3. All the line reactances shown in the figure between busses include the reactances of the transformers. Zero sequence values for these lines including transformers are 2.0 times those shown in the figure. Both generators are Y-Connected. Zero-sequence reactances of the generators connected to bus 1 and bus 3 are 0.04 and 0.08 per unit, respectively. The neutral of the generator at bus 1 is connected to ground through a reactor of 0.02 per unit; the generator at bus 3 has a solidly ground neutral. (2) (0) Find the bus impedance matrices ZS, Z, Zus for the given network and bus bus then compute the Subtransient current in per unit for a single line-to-ground fault on bus 2 and the fault current contribution flowing in the transmission line connected busses 1 and 2. Assume no pre-fault current is flowing and all pre-fault voltages at all the buses is 1/0° per unit.

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

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Q2) In the network in the figure below Y-Y connected transformers, each with
grounded neutrals, are at the ends of each transmission line that is not
terminating at bus 3. The transformers connecting the lines to bus 3 are Y-A, with
the neutral of the Y solidly grounded and the A sides connected to bus 3. All the
line reactances shown in the figure between busses include the reactances of the
transformers. Zero sequence values for these lines including transformers are 2.0
times those shown in the figure.
Both generators are Y-Connected. Zero-sequence reactances of the
generators connected to bus 1 and bus 3 are 0.04 and 0.08 per unit, respectively.
The neutral of the generator at bus 1 is connected to ground through a reactor
of 0.02 per unit; the generator at bus 3 has a solidly ground neutral.
Find the bus impedance matrices (¹), (²), z for the given network and
'bus' 'bus' bus
then compute the Subtransient current in per unit for a single line-to-ground fault
on bus 2 and the fault current contribution flowing in the transmission line
connected busses 1 and 2.
Assume no pre-fault current is flowing and all pre-fault voltages at all the buses
is 1/0° per unit.
j0.5
j0.28
voo
#
X = 0.2
Gen. 1
j0.4
X = 0.25
Gen. 2

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