A three-phase generator operating with a terminal voltage of 115V is connected to a three- phase transformer rated 7.5MVA 115/13.2kV. The transformer has a per-phase series impedance of 0.007+j0.075 pu and is connected to a distribution line with series impedance of 0.02+j0.1 pu per phase on a base of 10MVA, 13.2kV. The line supplies a balanced three-phase load rated 6MVA, 13.2kV with 0.85 lagging power factor. a. Draw and equivalent per phase circuit of the system indicating all impedances in per unit. Use 10MVA, 13.2kV as the base at the load. b. Find the current at the generator in amperes. c. Determine the voltage regulation at the load.

A three-phase generator operating with a terminal voltage of 115V is connected to a three- phase transformer rated 7.5MVA 115/13.2kV. The transformer has a per-phase series impedance of 0.007+j0.075 pu and is connected to a distribution line with series impedance of 0.02+j0.1 pu per phase on a base of 10MVA, 13.2kV. The line supplies a balanced three-phase load rated 6MVA, 13.2kV with 0.85 lagging power factor. a. Draw and equivalent per phase circuit of the system indicating all impedances in per unit. Use 10MVA, 13.2kV as the base at the load. b. Find the current at the generator in amperes. c. Determine the voltage regulation at the load.

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

4.) A three-phase generator operating with a terminal voltage of 115V is connected to a three-
phase transformer rated 7.5MVA 115/13.2kV. The transformer has a per-phase series
impedance of 0.007+j0.075 pu and is connected to a distribution line with series impedance of
0.02+j0.1 pu per phase on a base of 10MVA, 13.2kV. The line supplies a balanced three-phase
load rated 6MVA, 13.2kV with 0.85 lagging power factor.
a. Draw and equivalent per phase circuit of the system indicating all impedances in per
unit. Use 10MVA, 13.2kV as the base at the load.
b. Find the current at the generator in amperes.
c. Determine the voltage regulation at the load.
5.) If the transformer of 4.) is connected in A(115)-Y(13.2K), find the phase current of the
generator.

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