Electric Power Transformer Engineering.pdf

ELECTRIC

TRANSFORMER

ENGINEERING

POWER

Library of Congress Cataloging-in-Publication Data

Electric power transformer engineering / edited by James H. Harlow.

p. cm. — (The Electric Power Engineering Series ; 9)

Includes bibliographical references and index.

ISBN 0-8493-1704-5 (alk. paper)

1. Electric transformers. I. Harlow, James H. II. title. III. Series.

TK2551.E65 2004

621.31d4—dc21

2003046134

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Preface

Transformer engineering is one of the earliest sciences within the ﬁeld of electric power engineering, and

power is the earliest discipline within the ﬁeld of electrical engineering. To some, this means that

transformer technology is a fully mature and staid industry, with little opportunity for innovation or

ingenuity by those practicing in the ﬁeld.

Of course, we in the industry ﬁnd that premise to be erroneous. One need only scan the technical

literature to recognize that leading-edge suppliers, users, and academics involved with power transformers

are continually reporting novelties and advancements that would have been totally insensible to engineers

of even the recent past. I contend that there are three basic levels of understanding, any of which may

be appropriate for persons engaged with transformers in the electric power industry. Depending on day-

to-day involvement, the individual’s posture in the ﬁeld can be described as:

• Curious — those with only peripheral involvement with transformers, or a nonprofessional lacking

relevant academic background or any particular need to delve into the intricacies of the science

• Professional — an engineer or senior-level technical person who has made a career around electric

power transformers, probably including other heavy electric-power apparatus and the associated

power-system transmission and distribution operations

• Expert — those highly trained in the ﬁeld (either practically or analytically) to the extent that

they are recognized in the industry as experts. These are the people who are studying and pub-

lishing the innovations that continue to prove that the ﬁeld is nowhere near reaching a techno-

logical culmination.

So, to whom is this book directed? It will truly be of use to any of those described in the previous

three categories.

The curious person will ﬁnd the material needed to advance toward the level of professional. This

reader can use the book to obtain a deeper understanding of many topics.

The professional , deeply involved with the overall subject matter of this book, may smugly grin with

the self-satisfying attitude of, “I know all that!” This person, like myself, must recognize that there are

many transformer topics. There is always room to learn. We believe that this book can also be a valuable

resource to professionals.

The expert may be so immersed in one or a few very narrow specialties within the ﬁeld that he also

may beneﬁt greatly from the knowledge imparted in the peripheral specialties.

The book is divided into three fundamental groupings: The ﬁrst stand-alone chapter is devoted to

Theory and Principles . The second chapter, Equipment Types , contains nine sections that individually treat

major transformer types. The third chapter, which contains 14 sections, addresses Ancillary Topics asso-

ciated with power transformers. Anyone with an interest in transformers will ﬁnd a great deal of useful

information.

I wish to recognize the interest of CRC Press and the personnel who have encouraged and supported

the preparation of this book. Most notable in this regard are Nora Konopka, Helena Redshaw, and

Gail Renard. I also want to acknowledge Professor Leo Grigsby of Auburn University for selecting me to

edit the “Transformer” portion of his The Electric Power Engineering Handbook (CRC Press, 2001), which

forms the basis of this handbook. Indeed, this handbook is derived from that earlier work, with the

addition of four wholly new chapters and the very signiﬁcant expansion and updating of much of the

other earlier work. But most of all, appreciation is extended to each writer of the 24 sections that

comprise this handbook. The authors’ diligence, devotion, and expertise will be evident to the reader.

James H. Harlow

Editor

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