>IEEE IEEE Standard for High-Accuracy Instrument Transformers 6 IEEE Power Engineering Society Sponsored by the 3 Transformers Committee C5Z. IEEE IEEE Std C57.13.6TM-2005 3 Park Avenue New York, NY 10016-5997, USA 9 December 2005 IEEE Std C57.13.6-2005 IEEE Standard for High-Accuracy Instrument Transformers Sponsor Transformers Committee of the IEEE Power Engineering Society Approved 22 September 2005 IEEE-SA Standards Board Abstract: This standard defines one new 0.15 accuracy class for voltage transformers, two new 0.15 accuracy classes for current transformers, two new current transformer burdens, and two new current transformer routine accuracy test methods. Keywords: accuracy class, burden, CT, current transformer, high-accuracy， instrument transformer, metering, meters, phase angle, PT, ratio correction factor, RCF, relays, revenue metering, TCF, transformer correction factor, voltage transformer, VT The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright @ 2005 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 9 December 2005. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers,Incorporated. Print: ISBN0-7381-4828-8SH95386 PDF: ISBN 0-7381-4829-6 SS95386 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior writtenpermissionofthepublisher. IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its standards through a consensus development process, approved by the American National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of the Institute and serve without compensation. While the IEEE administers the process and establishes rules to promote fairness in the consensus development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the information contained in its standards. Use of an IEEE Standard is wholly voluntary. The IEEE disclaims liability for any personal injury, property or other damage, of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, or reliance upon this, or any other IEEE Standard document. The IEEE does not warrant or represent the accuracy or content of the material contained herein, and expressly disclaims any express or implied warranty, including any implied warranty of merchantability or fitness for a specific purpose, or that The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE Standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the standard. Every IEEE Standard is subjected to review at least every five years for revision or reaffirmation. When a document is more than five years old and has not been reaffirmed, it is reasonable to conclude that its contents, although still of some value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE Standard. In publishing and making this document available, the IEEE is not suggesting or rendering professional or other services for, or on behalf of, any person or entity. Nor is the IEEE undertaking to perform any duty owed by any other person or entity to another. Any person utilizing this, and any other IEE