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
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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
