An open-circuit test performed on a three-phase, 60-Hz synchronous generator shows that the rated open-circuit voltage of 13.8 kV is produced by a field current of 318 A. Extrapolation of the air-gap line from a complete set of measurements on the machine shows that the field- current corresponding to 13.8 kV on the air-gap line is 263 A. Calculate the saturated and unsaturated values of Laf.

An open-circuit test performed on a three-phase, 60-Hz synchronous generator shows that the rated open-circuit voltage of 13.8 kV is produced by a field current of 318 A. Extrapolation of the air-gap line from a complete set of measurements on the machine shows that the field- current corresponding to 13.8 kV on the air-gap line is 263 A. Calculate the saturated and unsaturated values of Laf.

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

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

An open-circuit test performed on a three-phase, 60-Hz synchronous generator shows that the
rated open-circuit voltage of 13.8 kv is produced by a field current of 318 A. Extrapolation
of the air-gap line from a complete set of measurements on the machine shows that the field-
current corresponding to 13.8 kV on the air-gap line is 263 A. Calculate the saturated and
unsaturated values of Laf.

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