IEEE Std C57.110-2008 IEEE Recommended Practice for Establishing Liquid-Filled and Dry- Type Power and Distribution.pdf
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1、IEEE Std C57.110-2008 (Revision of IEEE Std C57.110-1998) IEEE Recommended Practice for Establishing Liquid-Filled and Dry- Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents IEEE 3 Park Avenue New York, NY 10016-5997, USA 15 August 2008 IEEE Power Engineer
2、ing Society Sponsored by the Transformers Committee C57.110 TM IEEE Std C57.110TM-2008 (Revision of IEEE Std C57.110-1998) IEEE Recommended Practice for Establishing Liquid-Filled and Dry- Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents Sponsor Transform
3、ers Committee of the IEEE Power Engineering Society Approved 27 March 2008 IEEE-SA Standards Board Abstract: This recommended practice provides calculation methods to conservatively evaluate the feasibility for an existing installed dry-type or liquid-filled transformer, to supply nonsinusoidal load
4、 currents as a portion of the total load. This recommended practice also provides necessary application information to assist in properly specifying a new transformer expected to carry a load, a portion of which is composed of nonsinusoidal load currents. A number of examples illustrating these meth
5、ods and calculations are presented. Reference annexes provide a comparison of the document calculations to calculations found in other industry standards. Suggested temperature rise calculation methods are detailed for reference purposes. Keywords: accuracy, current transformer, instrument transform
6、er, primary winding, rated secondary voltage, routine tests, secondary winding, type tests, voltage transformer The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2008 by the Institute of Electrical and Electronics Engineers, Inc. All ri
7、ghts reserved. Published 15 August 2008. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center.
8、iv Copyright 2008 IEEE. All rights reserved. Introduction (This introduction is not part of IEEE Std C57.110-2008, IEEE Recommended Practice for Establishing Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents.) The widespread use of st
9、atic rectification equipment in industrial loads on small and medium power dry- type and liquid-filled transformers has resulted in a dramatic increase in the harmonic content of the load current of these transformers. It has become common for the harmonic factor of the current to exceed 0.05 per-un
10、it, which is the limit specified for “usual service conditions” in IEEE Std C57.12.00TM and IEEE Std C57.12.01TM. The higher harmonic content in the load current of these transformers causes higher eddy current loss in the windings and the structural parts linked by the transformer leakage flux and,
11、 consequently, higher operating temperatures. Users of this document should also recognize that liquid- filled transformers may have different load limitations than dry-type transformers and that the harmonic loading practices should treat the two types of transformers differently when necessary. Th
12、is recommended practice provides guidance for the conservative loading of transformers carrying nonsinusoidal load currents such that overheating is avoided. The intent of this document is to provide simple methods of calculating these effects on either a new transformer or an existing transformer.
13、More specifically, it is expected that this recommended practice would be used for the following situations: a) A new transformer required to carry some nonsinusoidal load currents, but will not be entirely devoted to a rectifier load. b) An existing transformer not originally specified for supplyin
14、g nonsinusoidal load currents, but is now required to supply a load, a portion of which is nonsinusoidal. Two methods are described in this recommended practice. The first method is intended to illustrate calculations by those with access to detailed information on loss density distribution within e
15、ach of the transformer windings. The second method is less accurate and is intended for use by those with access to transformer-certified test report data only. It is anticipated that the first method will emphasize the information necessary to specify a new transformer and show how this information
16、 is used by transformer design engineers, whereas the second method will be employed primarily by users. This recommended practice will provide methods for conservatively evaluating the feasibility of applying nonsinusoidal load currents to existing transformers and will clarify the requirements for
17、 specifying new transformers to supply nonsinusoidal loads. New transformers that are intended to supply loads with high harmonic content must be specified with a harmonic current distribution. The designer cannot “assume” nor can the user expect the designer to use “standard” or “typical” current d
18、istribution tables. If the harmonic content of the load is unknown, then both the user and the transformer designer are at risk and reasonable steps should be taken to ensure a conservative design for the application. Guidelines on how this information is used to develop proper transformer sizing is
19、 provided in this document, but appropriate calculations specific to the type of transformer design are the responsibility of the designer. Approximate calculation techniques that provide conservative results are provided for the typical user who has much less information than the transformer design
20、er. v Copyright 2008 IEEE. All rights reserved. Notice to users Laws and regulations Users of these documents should consult all applicable laws and regulations. Compliance with the provisions of this standard does not imply compliance to any applicable regulatory requirements. Implementers of the s
21、tandard are responsible for observing or referring to the applicable regulatory requirements. IEEE does not, by the publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights This document is co
22、pyrighted by the IEEE. It is made available for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations, and use in private self- regulation, standardization, and the promotion of engineering practices and methods. By making this document availab
23、le for use and adoption by public authorities and private users, the IEEE does not waive any rights in copyright to this document. Updating of IEEE documents Users of IEEE standards should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended f
24、rom time to time through the issuance of amendments, corrigenda, or errata. An official IEEE document at any point in time consists of the current edition of the document together with any amendments, corrigenda, or errata then in effect. In order to determine whether a given document is the current
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