1、Design and Applications Second Edition,Revised and Expanded RUBEN D.GARZON Square D Co.Smyrna,Tennessee M A R C E L a%MARCEL DEKKER,INC.D E K K E R Copyright 2002 by Taylor&FrancisISBN:0-8247-0799-0 This book is printed on acid-free paper Headquarters Marcel Dekker,Inc.270 Madison Avenue,New York,NY
2、 1001 6 tel:2 12-696-9000:fax:2 12-685-4540 Eastern Hemisphere Distribution Marcel Dekker AG Hutgasse 4,Postfach 8 12,CH-4001 Basel,Switzerland tel:41-61-261-8482;fax:41-61-261-8896 World Wide Web http:/ The publisher offers discounts on this book when ordered in bulk quantities.For more infor-matio
3、n,write to Special SaledProfessional Marketing at the headquarters address above.Copyright O 2002 by Marcel Dekker,Inc.All Rights Resewed.Neither this book nor any part may be reproduced or transmitted in any form or by any means,electronic or mechanical,including photocopying,microfilming,and recor
4、ding,or by any information storage and retrieval system,without permission in writing from the publisher.Current printing(last digit):I 0 9 8 7 6 5 4 3 2 1 PRINTED IN THE UNITED STATES OF AMERICA Copyright 2002 by Taylor&Francishttp:/To m y grandson E d B.Dommers Copyright 2002 by Taylor&FrancisThe
5、need for a second edition arises from the fact that,although it is generally recognized that circuit breakers represent a relatively mature technology there are some areas of thls technology where changes are inevitable and where some of these changes take place continuously.The area of circuit brea
6、ker standards is one in which substantial changes have taken place.These changes have been hven primarily by the need and the desire to aclueve a high level of harmonization be-tween the International(IEC)and the American(ANSI)Circuit Breaker Stan-dards.New standards have recently been published and
7、 revisions to some others are in the process of being approved by both organizations.However,as new re-quirements are being established for the new generations of equipment,it must be recognized that a significant number of circuit breakers had been designed to meet what are now obsolete standards.T
8、hese circuit breakers are still in service and consequently there is a need for preserving this type of information.It is the hope that the readers will find this second edition to be usehl in providing a link be-tween the old and the new requirements and furthermore that it can be considered to be
9、a valuable source of information and guidance for the application of the older equipment.Experience with the first edition has suggested the addition of some topics,which would serve to strengthen the readers knowledge,related to the practical design and application of lugh voltage circuit breakers.
10、More specifically,topics dealing with dielectric design considerations are covered in a new chapter where the basic concepts of dielectric strength field strength and types of insulation are presented.The presentation of this material has maintained the original philosophy of treating the subject ba
11、sed on a practical approach rather than a detailed mathe-matical one.Also added are sections dealing with the application of circuit breakers that are connected to systems that have a large reactance to resistance(X/R)ratio and applications where the circuit breaker is connected directly to power ge
12、nerators.The application section on capacitance switching has been revised,ex-panded,and updated to include recent work-related changes in the standards.The coverage of switching series and shunt reactors and of temporary voltages has Copyright 2002 by Taylor&Francisvi Preface to the Second Edition
13、been expanded in the switchmg overvoltages chapter,and a method for evaluating the benefits of condition monitoring is included in the final chapter.A number of other minor corrections and additions have been made throughout the text in an attempt to provide the reader with an enhanced version of th
14、is book.Again I am grateful to all who encouraged me to work on the second edition and who offered their comments and suggestions to make this possible.Ruben D.Garzon Copyright 2002 by Taylor&FrancisPREFACE TO THE FIRST EDITION Ever since the time when electrical energy was beginning to be utilized,
15、a need existed for a suitable switchng device that was able to initiate and to interrupt the flow of the electric current.The early designs of such switching devices were relatively crude and the principles of their operation relied only on empiri-cal knowledge.Circuit breakers were developed on the
16、 basis of a cut and try approach,but as the electrical system capacity continued to develop and grow,a more scientific approach was needed to achieve optimized designs of circuit breakers that would offer higher performance capabilities and greater reliability.The transition of current interruption from being an empirical art to an ap-plied science began in the 1920s.It was only then that worldwide research started to unravel the subtleties of the electric arc and its significance to the cur-ren
