IEEE-C57.12.50-1981-R1998.pdf
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1、ANSI C57.12.50-1981 (RI 998) American National Standard Re uirements forventilated Dr -T pe Dis 1 ributionTransformers I to w O kVA, Single-Phase and 15 to 500 kVA Three-phase, with ki h-Volta e 601 t8 Volts 34 500 Volts, Low-Vo 4 age 12 8 to 600 Approved 811 5/80 American National Standards Institu
2、te, Inc. The Institute of Electrical and Electronics Engineers, Inc 3 Park Avenue, NewYork, NY 10016-5997, USA Copyright O 2003 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Printed in the United States of America. Print: ISBN 0-7381-3643-3 SH95118 PDF: ISBN 0-7
3、381-3644-1 SS95118 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. American National Standard Approval of an American National Standard requires verification by ANSI that the requirement
4、s for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement me
5、ans much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect pr
6、eclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretatio
7、n of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name a
8、ppears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of Amer
9、ican National Standards may receive current information on all standards by calling or writing the American National Standards Institute. 11 -,-,- Foreword (This Foreword is not a part of American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-
10、phase, and 15 to 500 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 to 600 Volts, ANSI C57.12.50-1981.) This new dry-type transformer standard describes ventilated dry-type transformers with self-cooled kVA ratings 1- 500, and high voltages 2400-34 500 volts. (Forced-air-co
11、oled ratings for certain sizes are listed in Part Il.) It is also applicable from 601-2400 volts, but not for high voltages 600 volts and below, since American National Standards Committee C89 on Specialty Transformers has responsibility for transformers with high voltages 600 volts and below. This
12、standard is part of a new series of standards for dry-type transformers that also includes American National Standard General Requirements for Dry-Type Distribution and Power Transformers, ANSUIEEE C57.12.01-1979; American National Standard Test Code for Dry-Type Distribution and Power Transformers,
13、 ANSUIEEE C57.12.91- 1979; American National Standard Requirements for Ventilated Dry-Type Power Transformers, 501 kVA and Larger, Three-phase, with Highvoltage 601-34 500 Volts, Low-Voltage 208Y/120 to 4160 Volts, ANSI C57.12.51-1981; and American National Standard Requirements for Sealed Dry-Type
14、Power Transformers, 501 kVA and Larger, Three- Phase, with High-Voltage 601-34 500 Volts, Low-Voltage 208Y/120 to 4160 Volts, ANSI C57.12.52-1981. Dry-type transformers have been covered in the past by a variety of documents, including American National Standard General Requirements for Distribution
15、, Power, and Regulating Transformers, ANSI C57.12.00- 1973; American National Standard Test Code for Distribution, Power, and Regulating Transformers, ANSI C57.12.90- 1973; American National Standard Dry-Type Transformers for General Applications, ANSUNEMA ST 20-1 972; and Commercial, Institutional,
16、 and Industrial Dry-Type Transformers, NEMA TR 27-1965 (R1976). The new standards are the result of an effort encompassing the interests of users, manufacturers, and others dedicated to developing voluntary consensus standards primarily for dry-type transformers. They have various significant change
17、s, including higher BILs (for most voltages), more stringent and meaningful short-circuit requirements, improved descriptions of “usual” and “unusual” service conditions, and numerous other improvements. The new standards should be easier and more efficient to use, since they are arranged according
18、to the sequence in which information is normally needed. ANSI C57.12.50-1981 includes customary units and metric (SI) units, in accordance with ANSI policy. Sound levels were discussed in the preparation of this standard, but are not included at present. As a matter of information, NEMA TR 1-1974, T
19、ransformers, Regulators, and Reactors, includes data concerning dry-type transformer sound levels. It should be noted that ANSI C57.12.50-1981 covers some of the scope of ANSI (39.2-1972 (NEMA ST 20-1972). It is understood from the chairman of American National Standards Committee on Specialty Trans
20、formers, C89, that the committee will delete that portion of the scope of C89.2 relating to transformers 601 volts and above to eliminate duplication. This standard is a voluntary consensus standard. Its use is mandatory only when required by a duly constituted legal authority or when specified in a
21、 contractual relationship. To meet specialized needs and to allow innovation, specific changes are permissible when mutually determined by the user and the producer, provided such changes do not violate existing laws and are considered technically adequate for the function intended. When this docume
22、nt is used on a mandatory basis, the word “shall” indicates mandatory requirements, and words “should” and “may” refer to matters which are recommended and permitted, respectively, but not mandatory. The applicable ANSI rules and procedures for the preparation and approval of voluntary consensus sta
23、ndards have been followed. These speciSl procedures for voting, review and attempted reconciliation of dissenting viewpoints, a 60-day public review period, and final review and approval by the ANSI Board of Standards Review. Suggestions for improvement of this standard will be welcome. They should
24、be sent to the American National Standards Institute, Inc, 1430 Broadway, New York, N.Y. 10018. . 1 1 1 This standard was processed and approved for submittal to ANSI by American National Standards Committee on Transformers, Regulators, and Reactors, C57. Committee approval of the standard does not
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- IEEE C57 12.50 1981 R1998
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