IEEE C57 12 38-2014 en Pad-Mounted-Type Self-Cooled Single-Phase Distribution Transformers 250 kVA and Smaller High Voltage 34 500 GrdY 19 920 V and Below Low V.pdf

1、 IEEE Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 480/240 V and Below Sponsored by the Transformers Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA IEEE Power and Energy So

2、ciety IEEE Std C57.12.38-2014 (Revision of IEEE Std C57.12.38-2009) IEEE Std C57.12.38-2014 (Revision of IEEE Std C57.12.38-2009) IEEE Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 48

3、0/240 V and Below Sponsor Transformers Committee of the IEEE Power and Energy Society Approved 21 August 2014 IEEE-SA Standards Board Abstract: Certain electrical, dimensional, and mechanical characteristics are covered in this standard, and certain safety features of single-phase, 60-Hz, mineral-oi

4、l-immersed, self-cooled, pad-mounted, compartmental-type distribution transformers are taken into consideration. These transformers are rated 250 kVA and smaller with high voltages of 34 500 GrdY/19 920 V and below and with low voltages of 480/240 V and below. These transformers are generally used f

5、or step-down purposes from an underground primary cable supply. The connector, bushing, and terminal arrangements for radial or loop feed systems are covered in this standard. The electrical and mechanical requirements of any accessory devices that may be supplied with the transformer are not covere

6、d in this standard. Keywords: distribution transformers, IEEE C57.12.38, pad-mounted, padmounted, single phase, single-phase, transformer The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2014 by The Institute of Electrical and Electron

7、ics Engineers, Inc. All rights reserved. Published 5 September 2014. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent fitness for a particular purpose; non-infringement; and quality, accuracy, effectiveness, currency, or completeness of material. In addition

8、 IEEE disclaims any and all conditions relating to: results; and workmanlike effort. IEEE standards documents are supplied “AS IS” and “WITH ALL FAULTS.” Use of an IEEE standard is wholly voluntary. The existence of an IEEE standard does not imply that there are no other ways to produce, test, meas

9、ure, 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

10、 the standard. In publishing and making its standards available, IEEE is not suggesting or rendering professional or other services for, or on behalf of, any person or entity nor is IEEE undertaking to perform any duty owed by any other person or entity to another. Any person utilizing any IEEE Stan

11、dards document, should rely upon his or her own independent judgment in the exercise of reasonable care in any given circumstances or, as appropriate, seek the advice of a competent professional in determining the appropriateness of a given IEEE standard. IN NO EVENT SHALL IEEE BE LIABLE FOR ANY DIR

12、ECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO: PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

13、INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE PUBLICATION, USE OF, OR RELIANCE UPON ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE. Translations The IEEE consensus development process involves the review of do

14、cuments in English only. In the event that an IEEE standard is translated, only the English version published by IEEE should be considered the approved IEEE standard. Official statements A statement, written or oral, that is not processed in accordance with the IEEE-SA Standards Board Operations Man

15、ual shall not be considered or inferred to be the official position of IEEE or any of its committees and shall not be considered to be, or be relied upon as, a formal position of IEEE. At lectures, symposia, seminars, or educational courses, an individual presenting information on IEEE standards sha

16、ll make it clear that his or her views should be considered the personal views of that individual rather than the formal position of IEEE. Comments on standards Comments for revision of IEEE Standards documents are welcome from any interested party, regardless of membership affiliation with IEEE. Ho

17、wever, IEEE does not provide consulting information or advice pertaining to IEEE Standards documents. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. Since IEEE standards represent a consensus of concerned intere

18、sts, it is important that any responses to comments and questions also receive the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and Standards Coordinating Committees are not able to provide an instant response to comments or questions except in those

19、cases where the matter has previously been addressed. For the same reason, IEEE does not respond to interpretation requests. Any person who would like to participate in revisions to an IEEE standard is welcome to join the relevant IEEE working group. Comments on standards should be submitted to the

20、following address: Secretary, IEEE-SA Standards Board 445 Hoes Lane Piscataway, NJ 08854 USA Laws and regulations Users of IEEE Standards documents should consult all applicable laws and regulations. Compliance with the provisions of any IEEE Standards document does not imply compliance to any appli

21、cable regulatory requirements. Implementers of the standard 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 c

22、onstrued as doing so. Copyrights IEEE draft and approved standards are copyrighted by IEEE under U.S. and international copyright laws. They are made available by IEEE and are adopted for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations, a

23、nd use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making these documents available for use and adoption by public authorities and private users, IEEE does not waive any rights in copyright to the documents. Photocopies Subject to payment o

24、f the appropriate fee, IEEE will grant users a limited, non-exclusive license to photocopy portions of any individual standard for company or organizational internal use or individual, non-commercial use only. To arrange for payment of licensing fees, please contact Copyright Clearance Center, Custo

25、mer Service, 222 Rosewood Drive, Danvers, MA 01923 USA; +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. Updating of IEEE Standards documents Users of IEEE Standards documents shoul

26、d be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from 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 an

27、y amendments, corrigenda, or errata then in effect. Every IEEE standard is subjected to review at least every ten years. When a document is more than ten years old and has not undergone a revision process, it is reasonable to conclude that its contents, although still of some value, do not wholly re

28、flect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE standard. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of amendments, corrigenda, or errata, visit

29、 the IEEE-SA Website at http:/ieeexplore.ieee.org/xpl/standards.jsp or contact IEEE at the address listed previously. For more information about the IEEE SA or IEEEs standards development process, visit the IEEE-SA Website at http:/standards.ieee.org. Errata Errata, if any, for all IEEE standards ca

30、n be accessed on the IEEE-SA Website at the following URL: http:/standards.ieee.org/findstds/errata/index.html. Users are encouraged to check this URL for errata periodically. Patents Attention is called to the possibility that implementation of this standard may require use of subject matter covere

31、d by patent rights. By publication of this standard, no position is taken by the IEEE with respect to the existence or validity of any patent rights in connection therewith. If a patent holder or patent applicant has filed a statement of assurance via an Accepted Letter of Assurance, then the statem

32、ent is listed on the IEEE-SA Website at http:/standards.ieee.org/about/sasb/patcom/patents.html. Letters of Assurance may indicate whether the Submitter is willing or unwilling to grant licenses under patent rights without compensation or under reasonable rates, with reasonable terms and conditions

33、that are demonstrably free of any unfair discrimination to applicants desiring to obtain such licenses. Essential Patent Claims may exist for which a Letter of Assurance has not been received. The IEEE is not responsible for identifying Essential Patent Claims for which a license may be required, fo

34、r conducting inquiries into the legal validity or scope of Patents Claims, or determining whether any licensing terms or conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are

35、 expressly advised that determination of the validity of any patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association. Participants At the time this IEEE standard was completed, the Singl

36、e-Phase, Pad-Mounted, Distribution Transformers Working Group had the following membership: Ali Ghafourian, Chair Michael D. Faulkenberry, Vice Chair Timothy Albers Kahveh Atef Adam Bromley Paul Buchanan Thomas Callsen Paul Chisholm Don Duckett James Gardner Carlos Gayton Said Hachichi Michael Hardi

37、n Thomas Holifield Gael Kennedy Kent Miller Michael Miller Jerry Murphy Robert Olen Justin Pezzin Martin Rave Juan Saldivar Stephen Shull Charles Simmons Ed Smith Ronald Stahara Christopher Sullivan Giuseppe Termini Al Traut Donnie Trivitt Shelby Walters Dave Wiegand Alan Wilks Baitun Yang The follo

38、wing members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Samuel Aguirre Roberto Asano Peter Balma Barry Beaster Steven Bezner Thomas Blackburn Adam Bromley Carl Bush William Byrd Thomas Callsen Paul Cardinal Paul Ch

39、isholm Craig Colopy Stephen Conrad Willaim Darovny Gary Donner Randall Dotson Charles Drexler Don Duckett Michael D. Faulkenberry Bruce Forsyth Marcel Fortin Fredric Friend Doaa Galal James Gardner Carlos Gayton Frank Gerleve Ali Ghafourian Jalal Gohari James Graham Randall Groves Ajit Gwal Said Hac

40、hichi David Harris Jeffrey Hartenberger Jeffrey Helzer Reid Herzog Gary Heuston Thomas Holifield Philip Hopkinson Song Jin John Kay Gael Kennedy Gary King Jim Kulchisky Saumen Kundu John Lackey Chung-Yiu Lam Aleksandr Levin Lee Matthews Daleep Mohla Charles Morgan Daniel Mulkey Jerry Murphy Ryan Mus

41、grove K. R. M. Nair Dennis Neitzel Michael Newman Robert Olen Tim Olson Lorraine Padden Dwight Parkinson Bansi Patel Wesley Patterson Brian Penny Alvaro Portillo Lewis Powell Martin Rave Robert Resuali Michael Roberts Charles Rogers Oleg Roizman John Rossetti Thomas Rozek Daniel Sauer Bartien Sayogo

42、 Nikunj Shah Devki Sharma Stephen Shull Charles Simmons Jerry Smith Steve Snyder Ronald Stahara David Stankes Michael Swearingen Alan Traut Donnie Trivitt John Vergis David Wallace Shelby Walters Kenneth White Alan Wilks James Wilson William Wimmer Donald Zipse Copyright 2014 IEEE. All rights reserv

43、ed. vi When the IEEE-SA Standards Board approved this standard on 21 August 2014, it had the following membership: John Kulick, Chair Jon Walter Rosdahl, Vice Chair Richard H. Hulett, Past Chair Konstantinos Karachalios, Secretary Peter Balma Farooq Bari Ted Burse Clint Chaplin Stephen Dukes Jean-Ph

44、ilippe Faure Gary Hoffman Michael Janezic Jeffrey Katz Joseph L. Koepfinger* David J. Law Hung Ling Oleg Logvinov Ted Olsen Glenn Parsons Ron Petersen Adrian Stephens Peter Sutherland Yatin Trivedi Phil Winston Don Wright Yu Yuan *Member Emeritus Also included are the following nonvoting IEEE-SA Sta

45、ndards Board liaisons: Richard DeBlasio, DOE Representative Michael Janezic, NIST Representative Patrick Gibbons IEEE-SA Content Publishing Erin Spiewak IEEE-SA Technical Community Programs Copyright 2014 IEEE. All rights reserved. vii Introduction This introduction is not part of IEEE Std C57.12.38

46、2014, IEEE Standard for Pad-Mounted-Type, Self-Cooled, Single-Phase Distribution Transformers 250 kVA and Smaller: High Voltage, 34 500 GrdY/19 920 V and Below; Low Voltage, 480/240 V and Below. The Accredited Standards Committee on Transformers, Regulators, and Reactors, C57, has for many years be

47、en developing standards on transformers, regulators, and reactors. The data has been obtained from many sources including the standards of the Institute of Electrical and Electronics Engineers (IEEE) and the National Electrical Manufacturers Association (NEMA), reports of committees of the Edison El

48、ectrical Institute, and others. In 2009, the first version of this standard was prepared. It replaced and combined ANSI C57.12.21-1992 and ANSI C57.12.25-1990 and was generally revised to comply with the then approved style for published standards. In this version of the standard, the ratings have b

49、een increased to include a 250-kVA rating, additional figures for low-voltage line and neutral terminal arrangements and dimensions have been added, and the details for low-voltage line and neutral studs were expanded. This standard was prepared by the Single-Phase, Pad-Mounted, Distribution Transformers Working Group of the Distribution Transformers Subcommittee of the IEEE Power and Energy Society. Copyright 2014 IEEE. All rights reserved. viii Contents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 2 2. Normative references 2 3. Definitions 2 4. Ratings 3 4.1 Kilovolt-ampere rati