IEEE-C57.110-1998-R2004.pdf
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1、 The Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street, New York, NY 10017-2394, USA Copyright 1999 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 30 March 1999. Printed in the United States of America. Print: ISBN 0-7381-0431
2、-0 SH94670 PDF: ISBN 0-7381-0841-3 SS94670 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. IEEE Std C57.110-1998 (Revision of IEEE Std C57.110-1986) IEEE Recommended Practice for Establi
3、shing Transformer Capability When Supplying Nonsinusoidal Load Currents Sponsor Transformers Committee of the IEEE Power Engineering Society Approved 2 July 1998 IEEE-SA Standards Board Abstract: Methods are developed to conservatively evaluate the feasibility of supplying additional nonsinusoidal l
4、oad currents from an existing installed dry-type or liquid-lled transformer, as a por- tion of the total load. Clarication of the necessary application information is provided to assist in properly specifying a new transformer expected to carry a load, a portion of which is composed of nonsinusoidal
5、 load currents. A number of examples illustrating these methods and calculations are presented. Reference annexes make a comparison of the document calculations to calcula- tions found in other industry standards and suggested temperature rise methods are detailed for reference purposes. Keywords: c
6、urrent, eddy-current losses, harmonic current, harmonic load losses, harmonic loss factor, harmonics, K-factor, load currents, nonsinusoidal, transformer Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9
7、972545001 Not for Resale, 04/25/2007 03:06:08 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C57.110-1998(R2004) Reaffirmed 25 March 2004 IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinat- ing Committees of the IEEE Stand
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18、sibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying pa
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20、chnical Standards 1/9972545001 Not for Resale, 04/25/2007 03:06:08 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 1999 IEEE. All rights reserved. iii Introduction (This introduction is not part of IEEE Std C57-110-1998, IEEE Recommended Practice for Establishing
21、Transformer Capability When Supplying Nonsinusoidal Load Currents.) The widespread use of static rectication equipment in industrial loads on small and medium power trans- formers has resulted in a dramatic increase in the harmonic content of the load current for this equipment. It is quite common f
22、or the harmonic factor of the current to exceed 0.05 per unit, which is the limit specied for usual service conditions in IEEE Std C57.12.00-1993 and IEEE Std C57.12.01-1998. It is also well known that higher harmonic content in the current causes higher eddy current loss in winding conductors and s
23、truc- tural parts linked by the transformer leakage ux eld and, consequently, higher operating temperatures. For a number of years this recommended practice has provided guidance in conservative loading practices so that overloading could be avoided for transformers carrying nonsinusoidal load curre
24、nts. However, users have communicated the need for certain clarications to the IEEE Transformers Committee. A working group was formed to respond to this need and has revised the subject recommended practice. Precise deter- mination of the extra eddy-current loss produced by harmonic currents is a c
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