1、 IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers Sponsored by the Transformers Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA 7 February 2012 IEEE Power +1 978 750 8400. Permission to photocopy portions of any individual standard for edu
2、cational classroom use can also be obtained through the Copyright Clearance Center. . Introduction This introduction is not part of IEEE Std C57.12.70-2011, IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers. In 1964, the first version of this standa
3、rd was prepared. It replaced the material that originally appeared in a separate section of Part O of NEMA TR 1-1962, Transformers, Regulators, and Reactors. Moreover, it was intended that this standard would supersede the terminal markings and connections provided in ASA C6.1-1956, Standard Termina
4、l Markings for Electric Apparatus. After reaffirmation of this standard in 1971, it was revised and published as IEEE Std C57.12.70-1978. Significant revisions to this edition involved utilizing modern terminology, addition of zigzag phasor diagrams, inclusion of figures showing additional grounding
5、 connections, addition of figures showing “standard” and “reverse” arrangement commonly used in unit substations, and inclusion of a new “preferred” connection arrangement for three-phase delta-connected windings with a mid-tap in one winding. In 2000, the standard was again revised as IEEE Std C57.
6、12.70-2000 (Reaff 2006). The primary intent of that revision was to update the standard to comply with the approved style of currently published standards, to update reference standards, and to add terminal markings for padmounted compartmental transformers. In this version of the standard, the refe
7、rences have again been updated. Also an informative Annex A, Winding Connections Details and Explanations was added to introduce the clock face notation method for the transformer winding connection symbols. This is similar to the IEC method outlined in IEC standard 60076-1. A bibliography has been
8、added in Informative Annex B. Further, the standard has again been updated to match current Style Guide requirements, text was generally revised, and many figures have been redrawn to improve clarity. Notice to users Laws and regulations Users of IEEE Standards documents should consult all applicabl
9、e laws and regulations. Compliance with the provisions of any IEEE Standards document does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory requirements. IEEE does not, by the publicat
10、ion 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 copyrighted by the IEEE. It is made available for a wide variety of both public and private uses. These include both use, by r
11、eference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making this document available for use and adoption by public authorities and private users, the IEEE does not waive any rights in copyright to this docu
12、ment. Copyright 2012 IEEE. All rights reserved. ivUpdating of IEEE documents Users of IEEE Standards documents should 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 err
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14、ents, corrigenda, or errata, visit the IEEE-SA website or contact the IEEE at the address listed previously. For more information about the IEEE Standards Association or the IEEE standards development process, visit the IEEE-SA website. Errata Errata, if any, for this and all other standards can be
15、accessed at the following URL: http:/standards.ieee.org/findstds/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can be accessed at the following URL: http:/standards.ieee.org/findstds/interps/ index.html. Patents Attention i
16、s called to the possibility that implementation of this standard may require use of subject matter covered 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
17、 patent applicant has filed a statement of assurance via an Accepted Letter of Assurance, then the statement is listed on the IEEE-SA website http:/standards.ieee.org/about/sasb/patcom/patents.html. Letters of Assurance may indicate whether the Submitter is willing or unwilling to grant licenses und
18、er patent rights without compensation or under reasonable rates, with reasonable terms and conditions 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 I
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20、f any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are 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 fro
21、m the IEEE Standards Association. Copyright 2012 IEEE. All rights reserved. vParticipants At the time this standard was completed, the C57.12.70 Working Group had the following membership: Stephen Shull, Chair Jerry Murphy, Vice Chair William Bartley Charles Drexler David Harris Rich Hollingsworth G
22、ael Kennedy Charles Simmons Charles Sweetser Alan Traut The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. William J. Ackerman Samuel Aguirre Stephen Antosz Carlo Arpino Robert Ballard Peter Balma Bar
23、ry Beaster Steven Bezner Wallace Binder Thomas Bishop Thomas Blackburn W. Boettger Adam Bromley Chris Brooks Darren Brown Carl Bush William Bush Kurt Clemente Craig Colopy Jerry Corkran John Crouse Jorge Fernandez Daher Willaim Darovny Dieter Dohnal Gary Donner Randall Dotson Charles Drexler Fred El
24、liott Gary Engmann Dan Evans Michael Faulkenberry Joseph Foldi Marcel Fortin Jalal Gohari Edwin Goodwin James Graham Randall Groves Said Hachichi J. Harlow Jerry Harness David Harris Jeffrey Hartenberger Timothy Hayden Gary Heuston Timothy Holdway Philip Hopkinson Gael Kennedy Sheldon Kennedy Jim Ku
25、lchisky Saumen Kundu John Lackey Chung-Yiu Lam Thomas La Rose Larry A. Lowdermilk Greg Luri J. Dennis Marlow Lee Matthews William McBride John Miller Daleep Mohla Charles Morgan Daniel Mulkey Jerry Murphy Dennis Neitzel Arthur Neubauer Michael S. Newman Carl Niemann Joe Nims Mohamed Omran Bansi Pate
26、l Shawn Patterson Brian Penny Paul Pillitteri Donald Platts Alvaro Portillo Lewis Powell Iulian Profir Jeffrey Ray Michael Roberts John Rossetti Marnie Roussell Thomas Rozek Daniel Sauer Bartien Sayogo Stephen Schroeder Devki Sharma Stephen Shull James Smith Jerry Smith Steve Snyder Gary Stoedter Pe
27、ter Sutherland David Tepen Alan Traut Eric Udren John Vergis Jane Verner David Wallach John Wang Kenneth White Matthew Wilkowski Alan Wilks John Wilson Jian Yu Matthew Zeedyk Copyright 2012 IEEE. All rights reserved. viWhen the IEEE-SA Standards Board approved this standard on 7 December 2011, it ha
28、d the following membership: Richard H. Hulett, Chair John Kulick, Vice Chair Robert M. Grow, Past Chair Judith Gorman, Secretary Masayuki Ariyoshi William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Philippe Faure Alex Gelman Paul Houz Jim Hughes Joseph L. Koepfinger* David Law Thomas Lee Hung Li
29、ng Oleg Logvinov Ted Olsen Gary Robinson Jon Rosdahl Sam Sciacca Mike Seavey Curtis Siller Phil Winston Howard Wolfman Don Wright * Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish Aggarwal, NRC Representative Richard DeBlasio, DOE Representative Mic
30、hael Janezic, NIST Representative Catherine Berger IEEE Standards Project Editor Erin Spiewak IEEE Standards Program Manager, Technical Program DevelopmentCopyright 2012 IEEE. All rights reserved. viiContents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 1 2. Normative references 1 3. Marking of terminals
31、 and identification of windings . 2 3.1 General 2 3.2 Sequence designation 2 3.3 External and Internal terminal designation 2 3.4 Neutral terminal designation 3 3.5 Grounded terminal designation 3 4. Single-phase transformers 3 4.1 Types of transformers 3 4.2 Polarity 4 4.3 Order of numbering termin
32、als of any winding 9 4.4 Order of numbering terminals of different windings. 9 4.5 Location of H1terminal .9 4.6 Parallel operation. 10 5. Angular displacement and connections for single-phase transformers in three-phase and six-phase banks. 11 6. Phase relationships and terminal markings for three-
33、phase transformers. 15 6.1 Relation between highest voltage winding and other windings. 15 6.2 Phase relationships and terminal markings 17 6.3 Marking of full winding terminals. 17 6.4 Tap leads 18 6.5 Location of external terminals . 19 6.6 Interphase connections made outside of case 21 6.7 Parall
34、el operation. 21 7. Terminal markings for three-phase to six-phase transformers22 7.1 General 22 7.2 Marking of full winding terminals. 22 7.3 Relation between three phase and six phase windings 23 7.4 Tap leads 23 8. Use of transformers with standard voltage diagrams in connecting systems of variou
35、s phase displacements . 24 Annex A (informative) Winding connection details and explanations. 25 A.1 Wye windings configurations . 25 A.2 Delta windings configurations 26 A.3 Zigzag (interconnected star) winding configurations . 27 A.4 Combining the various winding configurations28 A.5 Examples 36 A
36、.6 Winding combinations and explanation drawings 37 Annex B (informative) Bibliography 45 Copyright 2012 IEEE. All rights reserved. viiiIEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers IMPORTANT NOTICE: This standard is not intended to ensure safet
37、y, security, health, or environmental protection. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requirements. This IEEE document is made available for use subject to important notices and legal disclaimers
38、. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclai
39、mers.html. 1. Overview 1.1 Scope This standard defines the terminal markings and connections for distribution, power, and regulating transformers covered in the IEEE C57 series of standards, guides, and recommended practices. 1.2 Purpose The standard provides a consistent method for terminal marking
40、s and connections for single-phase and three-phase distribution, power, and regulating transformers. It designates terminal markings for interchangeability showing the sequence, external terminations, neutral terminations, grounded terminations, and marking of full and tap winding terminations. It a
41、lso puts forth the connections of single-phase transformers in various configurations and describes the angular displacement of three-phase transformers when connected to various system phase displacements. 2. Normative references The following referenced documents are indispensable for the applicat
42、ion of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is Copyright 2012 IEEE. All rights reserved. 1IEEE Std C57.12.70-2011 IEEE Standard for Standard Terminal Markings and Connections for Distribution and Pow
43、er Transformers explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. IEEE Std C57.12.00-2010, IEEE Standard for General Requirements for Liquid-Immersed Distribution,
44、Power, and Regulating Transformers.1,2IEEE Std C57.12.01-2005, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers, Including Those with Solid-Cast and/or Resin Encapsulated Windings. 3. Marking of terminals and identification of windings 3.1 General The windings of a
45、 transformer shall be distinguished from one another as follows. Two winding transformers shall have their windings designated as high voltage (HV or H) and low voltage (LV or X). Transformers with more than two windings shall have their windings designated as H, X, Y, and Z except where a specific
46、IEEE C57 standard calls for a different designation e.g., IEEE Std C57.18.10-1998 B15,36.9.3(b). 3.2 Sequence designation The highest voltage winding shall be designated as HV or H, except for transformers designed for three- phase to six-phase transformation (see Clause 7). The other windings, in o
47、rder of decreasing voltage, are designated as X, Y, and Z. If two (or more) windings have the same voltage and different kVA (kilovolt ampere) ratings, the higher kVA winding receives the prior letter designation of the two (or more) letters available, according to the sequence by voltage as explain
48、ed above. If two or more windings have the same kVA and voltage rating, the designations of these windings are arbitrarily assigned. 3.3 External and Internal terminal designation In general, external terminals shall be distinguished from one another by marking each terminal with a capital letter, f
49、ollowed by a subscripted number. The terminals of the H winding are marked H1, H2, H3, etc. The terminals of the X winding are marked X1, X2, X3, etc. When two external terminals are connected to the same end of a winding, such as the terminals on loop feed transformers, they shall be identified by the same capital letter and subscripted numeral followed by an additional subscripted letter A or B, for example, H1Aand H1B, H2Aand H2B. The identification of external terminals shall be accomplished either by the use of the sketches on the nameplate showing locations of sp
