IEEE C57 12 40-2011 en Network Three-Phase Transformers 2500 kVA and Smaller High Voltage 34 500 GrdY 19 920 and Below Low Voltage 600 V and Below Subway and Va.pdf

1、 IEEE Std 90003-2008 IEEE Std 90003-2008 IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/ 19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed) Sponsored by the Transformers Committee IEEE 3 Park Avenue New York,

2、 NY 10016-5997 USA 25 January 2012 IEEE Power High Voltage, 34 500 GrdY/ 19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed) Sponsor Transformers Committee of the IEEE Power +1 978 750 8400. Permission to photocopy portions of any individual standard for educatio

3、nal classroom use can also be obtained through the Copyright Clearance Center. Copyright 2012 IEEE. All rights reserved. ivIntroduction This introduction is not part of IEEE Std C57.12.40-2011, IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/19 92

4、0 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed). This standard is an update to IEEE Std C57.12.40TM-2006 and is the first full technical update to this standard since it was published as a NEMA/ANSI standard called C57.12.40-2000. Revisions were made to the organi

5、zation of the clauses and major changes were made to clarify the requirements for the primary disconnect and grounding switch. 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 im

6、ply 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 publication of its standards, intend to urge action that is not in compliance with applicable laws, and t

7、hese 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 reference, in laws and regulations, and use in private self-regulation, standardization, and the p

8、romotion 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 document. Updating of IEEE documents Users of IEEE standards should be aware that these documents may

9、 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 any amendments, corrigenda, or errata

10、 then in effect. 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 the IEEE Standards Association web site at http:/ieeexplore.ieee.org/xpl/standards.jsp, or contact the IEEE at the a

11、ddress listed previously. For more information about the IEEE Standards Association or the IEEE standards development process, visit the IEEE-SA web site at http:/standards.ieee.org. Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:/standards.ieee.or

12、g/findstds/errata/index.html. Users are encouraged to check this URL for errata periodically. Copyright 2012 IEEE. All rights reserved. vInterpretations Current interpretations can be accessed at the following URL: http:/standards.ieee.org/findstds/interps/index.html. Patents Attention is called to

13、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 with respect to the existence or validity of any patent rights in connection therewith. The IEEE is not responsible for identifying E

14、ssential Patent Claims for which a license may be required, for 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

15、 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 from the IEEE Standards Association. Copyrig

16、ht 2012 IEEE. All rights reserved. viParticipants At the time this IEEE standard was completed, the C57.12.40 Working Group had the following membership: Brian Klaponski, Chair Edward Bertolini David Blew Thomas Callsen John Crouse Joseph Cultrera Larry Dix Mark Faulkner Richard Graham Said Hachichi

17、 Mohammad Hussain Kevin Jimenez Dennis Lee Daniel Mulkey Carl Niemann Pete Risse Kenneth Romano John Rossetti Dinesh Sankarakurup Stephen Schroeder Jeremy Sewell Giuseppe Termini Terry Turvey William Wimmer The following members of the individual balloting committee voted on this standard. Balloters

18、 may have voted for approval, disapproval, or abstention. William J. Ackerman Carlo Arpino Peter Balma Steven Bezner Wallace Binder Chris Brooks Stephen Conrad Jerry Corkran John Crouse Carlo Donati Gary Donner Donald Dunn Gary Engmann Michael Faulkenberry Marcel Fortin Fredric Friend Jalal Gohari J

19、ames Graham Richard Graham Randall Groves Said Hachichi Jeffrey Hartenberger Timothy Hayden Roger Hayes Gary Heuston John Houdek Charles Johnson John Kay Gary King Brian Klaponski Jim Kulchisky Chung-Yiu Lam Dennis Lee Greg Luri John W. Matthews Gary Michel Charles Morgan Kimberly Mosley Daniel Mulk

20、ey Michael S. Newman Carl Niemann Nick S. A. Nikjoo Lorraine Padden Bansi Patel Christopher Petrola Alvaro Portillo Michael Roberts Charles Rogers Oleg Roizman Kenneth Romano John Rossetti Marnie Roussell Thomas Rozek M. Sachdev Dinesh Sankarakurup Bartien Sayogo Stephen Schroeder Charles McShane Gi

21、l Shultz Hyeong Sim Charles Simmons James Smith Jerry Smith Gary Stoedter John Teixeira David Tepen John Vergis Barry Ward William Wimmer Jian Yu Copyright 2012 IEEE. All rights reserved. viiWhen the IEEE-SA Standards Board approved this standard on 7 December 2011, it had the following membership:

22、Richard H. Hulett, Chair John Kulick, Vice Chair Robert M. Grow, Past President Judith Gorman, Secretary Masayuki Ariyoshi William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Philippe Faure Alexander Gelman Paul Houz Jim Hughes Joseph L. Koepfinger* David J. Law Thomas Lee Hung Ling Oleg Logvinov

23、 Ted Olsen Gary Robinson Jon Walter Rosdahl Sam Sciacca Mike Seavey Curtis Siller Phil Winston Howard L. Wolfman Don Wright *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish Aggarwal, NRC Representative Richard DeBlasio, DOE Representative Michael Ja

24、nezic, NIST Representative Julie Alessi IEEE Standards Program Manager, Document Development Erin Spiewak IEEE Standards Program Manager, Technical Program Development Copyright 2012 IEEE. All rights reserved. viiiContents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 1 2. Normative references 2 3. Transf

25、ormer performance requirements . 2 3.1 Kilovolt-ampere ratings. 2 3.2 Voltage rating and tap ratings 3 3.3 Angular displacement 3 3.4 Basic lightning impulse insulation levels (BILs). 3 3.5 Percent impedance. 4 3.6 Audible sound levels . 4 4. Tests . 4 5. Construction . 4 5.1 General 4 5.2 Corrosion

26、 resistance 5 5.3 Tank. 5 5.4 Cooling panels . 6 5.5 Primary switch chamber 6 5.6 Secondary network protector throat. 8 5.7 Accessory equipment for transformer tanks 8 5.8 Dimensions 10 6. Primary disconnect and grounding switch 11 6.1 General 11 6.2 Network switch electrical performance requirement

27、s . 11 7. Bushings . 15 7.1 Primary cable entrance 15 7.2 Other primary bushings . 16 7.3 Secondary bushings . 16 7.4 Terminal markings. 17 8. Neutral termination. 17 8.1 Primary neutral 17 8.2 Secondary neutral 17 9. Nameplate. 18 10. Connections of transformer for shipment by manufacturer 18 Annex

28、 A (informative) Bibliography . 24 Copyright 2012 IEEE. All rights reserved. 1IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed) IMPORTANT NOTICE: This standard

29、is not intended to ensure safety, 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 importan

30、t notices and legal disclaimers. 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:

31、/standards.ieee.org/IPR/disclaimers.html. 1. Overview 1.1 Scope This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of three-phase, 60-Hz, liquid-immersed, self-cooled, network transformers with a primary grounding

32、 switch. These transformers are rated 2500 kVA and below with high voltages of 34 500GrdY/19 920 volts and below. These transformers are generally used for step-down purposes from underground primary cables and supply a secondary network system through network protectors. These transformers are typi

33、cally installed below ground level. 1.2 Purpose This standard is intended for use as a basis for establishing the performance, electrical and mechanical interchangeability, safety of the equipment covered, and to assist in the proper selection of such equipment. IEEE Std C57.12.40-2011 IEEE Standard

34、 for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed) Copyright 2012 IEEE. All rights reserved. 22. Normative references The following referenced documents are indispensable for

35、 the application 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 explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (in

36、cluding any amendments or corrigenda) applies. IEEE Std 386, IEEE Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600 V.1,2IEEE Std C57.12.00, IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers. IEEE Std

37、 C57.12.20, IEEE Standard for Overhead-Type Distribution Transformers, 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below. IEEE Std C57.12.32, IEEE Standard for Submersible Equipment Enclosure Integrity. IEEE Std C57.12.80, IEEE Standard Terminology for Powe

38、r and Distribution Transformers. IEEE Std C57.12.90, IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers. 3. Transformer performance requirements 3.1 Kilovolt-ampere ratings Kilovolt-ampere ratings shall be as specified in Table 1. Table 1 Kilovolt-ampere rat

39、ings 55 C 65 C 300 336 500 560 750 840 1000 1120 1500 1680 2000 2240 2500 2800 The base rating as listed in Table 1 shall not exceed a 55 C average winding temperature rise above standard ambient. The 65 C rating is based on not exceeding a 65 C average winding temperature rise or an 80 C hot-spot t

40、emperature rise, as specified in IEEE Std C57.12.00. The temperature rise of the insulating liquid shall not exceed 65 C measured near the top of the tank. The dual-rated transformers as shown in Table 1 are based on utilizing an insulation system that allows continuous operation at a 65 C rise and

41、112% of the 55 C base rating. Dual-rated transformers shall also 1The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers, Inc. 2IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 H

42、oes Lane, Piscataway, NJ 08854, USA (http:/standards.ieee.org/). IEEE Std C57.12.40-2011 IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/19 920 and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed) Copyright 2012 IEEE.

43、All rights reserved. 3be capable of delivering the 55 C base kilovolt-ampere rating when operated in a 40 C average ambient temperature with a maximum temperature not to exceed 50 C. When required, a kilovolt-ampere base rating with a 65 C average winding temperature rise can be specified. Nonsymmet

44、rical unbalanced excitation or loading of wye-wye-connected units may cause heating of their tanks in excess of that which would be produced by balanced conditions. To reduce the probability of this tank heating, such a unit shall be provided with a core construction that will not saturate when 33-p

45、ercent zero sequence voltage is applied. 3.2 Voltage rating and tap ratings Preferred voltage ratings and taps shall be in accordance with Table 2. All taps shall be at rated kilovolt-amperes. Table 2 Preferred ratings for subway-type and vault-type secondary network transformers Preferred nominal s

46、ystem voltage BILakV RatingbTransformer high-voltage taps Kilovolt-ampere ratings for low-voltage ratings of Above Below 216Y/125c480Y/277c2400/4160Y 60 4160 None None 3001000 5001000 4160Y/2400 None None 3001000 5001000 12 000 95 12 000 None 11 700/11 400/11 100/10 800 3001000 5002500 12 600/ 12 30

47、0 11 700/11 400 5002500 13 200 None 13 860/13 530 12 870/12 540/12 210/11 880 12 870/12 540 None 12 870/12 540/12 210/11 880 13 200 or 7620/13 200Y 95 13 200Y/7620 13 860/13 530 12 870/12 540 3001000 5002500 14 400 95 14 400 None 15 120/14 760 14 040/13 680/13 320/12 960 14 040/13 680 3001000 500250

48、0 23 000 150 22 900 24 100/23 500 22 300/21 700 5001000 5002500 34 500 200 27 060 29 090/28 414/27 737 26 383 5001000 5002500 34 500 200 34 400 36 200/35 300 33 500/32 600 5001000 5002500 aBIL = basic lightning impulse insulation level bAll windings are delta-connected unless otherwise indicated. cK

49、ilovolt-ampere ratings separated by an en-dash (-) include all ratings within that range. 3.3 Angular displacement The angular displacement between the primary and secondary terminal voltages of three-phase transformers with wye-wye connections shall be 0. The angular displacement between the primary and secondary terminal voltages of three-phase transformers with delta-wye connections shall be 30 with the primary leading the low voltage. 3.4 Basic lightning impulse insulation levels (BILs) The HV BIL shall be as specifie