A 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and 0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The transmission line is connected to another Wye-Delta transformer and then to a three-phase load with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0. A single line-to-line fault occurs at the end of the transmission line on phases B and C. a. Draw the sequence networks b. Compute the Sequence currents c. Compute the faulted phase currents

A 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and 0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The transmission line is connected to another Wye-Delta transformer and then to a three-phase load with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0. A single line-to-line fault occurs at the end of the transmission line on phases B and C. a. Draw the sequence networks b. Compute the Sequence currents c. Compute the faulted phase currents

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and
0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye
grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence
reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive
and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The
transmission line is connected to another Wye-Delta transformer and then to a three-phase load
with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0.
A single line-to-line fault occurs at the end of the transmission line on phases B and C.
a. Draw the sequence networks
b. Compute the Sequence currents
c. Compute the faulted phase currents

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