ANSI C57.12.22-1993 American National Standard for Transformers—Pad-Mounted Compartmental-Type Self-Cooled Three-Phase Distribution TransformersWith High-Voltage Bushings 2500 kVA .pdf

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1、 The Institute of Electrical and Electronics Engineers, Inc.3 Park Avenue, New York, NY 10016-5997, USACopyright 2003 by the Institute of Electrical and Electronics Engineers, Inc.All rights reserved. Printed in the United States of America.Print:ISBN 0-7381-3626-3 SH95109PDF:ISBN 0-7381-3627-1 SS95

2、109No 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.ANSI C57.12.22-1993(R1998)American National Standard for Transformers Pad-Mounted, Compartmental-Type, Self-Cooled Three-Phase Distribut

3、ion Transformers With High-Voltage Bushings, 2500 kVA and Smaller: High Voltage, 34 500 Grd Y/19 920 Volts and Below; Low Voltage, 480 Volts and BelowApproved July 1993American National Standards Institute, Inc.Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS und

4、er license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI

5、C57.12.22 - 1993 Approval of an American National Standard requires verification by ANSI that the requirements 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, s

6、ubstantial agreement has been reached by directly and materially affected interests. Substantial agreement means 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 resolutio

7、n. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the stand ards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The Ameri

8、can National Standards Institute does not develop standards and will in no circumstances give an interpretation o f 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 S

9、tandards Institute. Requests for interpretations shall be addressed to the secretariat or sponsor whose name appears 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 Institut

10、e require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Insti tute. Published by

11、National Electrical Manufacturers Association 1300 N. 17th Street, Rosslyn, Virginia 22209 Copyright 1998 National Electrical Manufacturers Association All rights reserved. No part of this publication may be reproduced i n any form, in an electronic retrieval system or otherwise, without prior writt

12、en permission of the publisher. Printed in the United States of America Am erican National Standard Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57

13、.12.22 - 1993 ii Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57.12.22 - 1993 i CONTENTS Page Foreword . iii 1 Scope . 1 2 Referenced American Nati

14、onal Standards . 1 3 Ratin gs . 2 3.1 Kilovolt - ampere ratings 2 3.2 Volt ratings and tap ratings 2 4 Basic lightning impulse insulation levels and dielectric test levels . 2 5 Impedance voltage . 2 5.1 Percent impedance voltage . 2 5.2 Tolerance on impedance voltage 2 5.3 Tolerance on impedance vo

15、ltage on a tap 3 6 Tests . 3 6.1 General 3 6.2 Dielectric tests . 3 7 Construction . 3 7.1 General 3 7.2 Bushings and terminals . 4 7.3 High - voltage and low - voltage compartments 4 7.4 Instruction nameplate 4 7.5 Oil preservation . 5 7.6 Tanks . 5 8 Storage and installation 6 8.1 Storage 6 8.2 In

16、stallation 6 9 Other requirements that may be specified for some applications 6 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57.12.22 - 1993 ii Cop

17、yright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57.12.22 - 1993 iii Foreword (This Foreword is not part of American National Standard C57.12.22) The Accr

18、edited Standards Committee on T ransformers, Regulators, and Reactors, C57, has for many years been developing and correlating standards on transformers and regulators. The data used in this work have been gathered from many sources, including the standard of the Institute of Electrical and Electron

19、ics Engineers and the National Electrical Manufacturers Association, reports of committees of the Edison Electric Institute, and others. This standard and the companion standard on single - phase transformers (ANSI C57.12.21) were prepared by th e Subcommittee on Distribution Transformers, Overhead

20、and Pad - mounted, C57.12.2. Suggestions for improvement of this standard will be welcome. They should be sent to the American National Standards Institute, 1430 Broadway, New York, 10018. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Transformer

21、s, Regulators, and Reactors, C57. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the C57 Committee had the following members. P. Hopkinson, Chairman J. Thompson, Vice Chairman J. A. Gauthier, Sec

22、retary Organization Represented Name of Representative Electric Light and Power T. Diamantis J. W . Howard M. Mingoia (Alternate) P. Orehek (Delegation Chairman) S. Paiva J. Sullivan J. Thompson (Alternate) Institute of Electrical and Electronic Engineers J. Borst J. Davis J. H. Harlow L. Sa vio (De

23、legation Chairman) H. Smith (Alternate) R. Veitch National Electrical Manufacturers Association P. Coulter P. Dewever (Alternate) J. Douglas (Alternate) S. Endersbe A. Ghafourian P. Hopkinson (Delegation Chairman) K. Linsley R. Plaster (Alternate) H. Robin (Alternate) T. Reback Copyright The Institu

24、te of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57.12.22 - 1993 iv Underwriters Laboratories W. OGrady R. Seelbach (Alt.) U.S. Department of the Navy H. Stickley U.S. Depa

25、rtment of Energy K. Wolohan U.S. Department of the Interior R. Chadwick U.S. D.A. REA J. Bohlk American National Standards Institute C. Zegers Subcommittee C57.12.2, on Distribution Transformers, Overhead and Pad - Mounted which developed this standard, had the following members: K. Hanus, Chairman

26、Membe rs: G. Andersen J. Antweiler J. Bishop J. Corkran T. Diamantis D. Galloway A. Ghafourian G. Henry R. Hollingsworth J. Hunt R. Jordan J. Lazar M. Mingoia N. Mohesky G. Paiva C. Pearson T. Pekarek D. Rolling E. Smith R. Scheu R. Stahara A. Wilk sCopyright The Institute of Electrical and Electron

27、ics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 AMERICAN NATIONAL STANDARD ANSI C57.12.22 - 1993 Pad - Mounted, Compartmental - Type, Self Cooled Three Phase Distribution Transformers With High - Voltage

28、Bushings, 2500 kVA and Smaller: High Voltage, 34 500 Grd Y/19 920 Volts and Below; Low Vol tage, 480 Volts and Below 1 Scope 1.1 This standard is intended for use as a basis for determining performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of

29、 such equipment. 1.2 This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of three - phase, 60 Hz., mineral - oil - immersed, self - cooled, pad -mounted, compartmental - type distribution transformers with high - v

30、oltage bus hings. These transformers are rated 2500 kVA and smaller, with high voltages of 34 500 GrdY/19 920 volts and below, and with low voltages of 480 volts and below. These transformers are generally used for step - down purposes from an underground primary cable supply. NOTE Refer to latest f

31、ederal regulations concerning PCB contamination in transformers. 1.3 This standard covers the bushing and terminal arrangements for radial feed systems. Either certain minimum dimensions (see figures 1 - 3) or certain specif ic dimensions (see figures 4 - 6) shall be specified. 1.4 This standard doe

32、s not cover the electrical and mechanical requirements of any accessory devices that may be supplied with the transformer. 2 Referenced American National Standards All characteris tics, definitions, terminology, voltage designation, and tests, except as otherwise specified herein, shall be in accord

33、ance with the following American National Standards. When an American National Standard referred to in this document is superseded by a revision approved by the American National Standards Institute, Inc., the latest revision shall apply. ANSI/IEEE C57.12.00 - 1993, General Requirements for Liquid -

34、Immersed Distribution, Power, and Regulating Transformers ANSI/C57.12.20 - 1989, Requirements f or Overhead - Type Distribution Transformers, 500 kVA and Smaller: High - Voltage, 34 500 Volts and Below; Low - Voltage, 7970/13 800Y Volts and Below ANSI C57.12.28 - 19XX, Switchgear and Transformers Pa

35、d - Mounted Equipment Enclosure Integrity ANSI C57.12.70 - 197 8, Terminal Markings and Connections for Distribution and Power Transformers ANSI/IEEE C57.12.80 - 1978, Terminology for Power and Distribution Transformers ANSI/IEEE C57.12.90 - 1993, Test Code for Liquid - Immersed Distribution, Power,

36、 and Regulating Transf ormers and Guide for Short Circuit Testing of Distribution and Power Transformers Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANS

37、I C57.12.22 - 1993 2 ANSI/IEEE C57.91 - 1979, Guide for Loading Mineral Oil -Immersed Overhead and Pad - Mounted Distribution Transformers Rated 500 kVA and less with 65 C or 55 C Average Winding R ise ANSI/IEEE C57.92 - 1981, Guide for Loading Mineral Oil -Immersed Power Transformers up to and incl

38、uding 100 MVA with 55 C or 65 C Average Winding Rise 3 Ratings 3.1 Kilovolt - ampere ratings Kilovolt -ampere ratings are continuous and based on not exceed ing either a 65 C average winding temperature rise or an 80 C hot - spot conductor temperature rise. The temperature rise of the insulating oil

39、 shall not exceed 65 C when measured near the top of the tank. These kilovolt - ampere ratings are based on the usual temperature and altitude service conditions specified in ANSI/IEEE C57.12.00. The kilovolt -ampere ratings shall be as follows: 75 750 112 - 1/2 1000 150 1500 225 2000 300 2500 500 3

40、.2 Voltage ratings and tap ratings 3.2.1 Voltage ratings shall be in accordance with table 1. 3.2.2 Voltage taps shall be as given in table 2. The tap changer handle, or the area next to the handle, in the terminating compartment shall be marked indicating suitability for de - energized operation on

41、ly. 4 Basic lightn ing impulse insulation levels and dielectric test levels 4.1 Basic lightning impulse insulation levels (BILs) shall be in accordance with tables 1 and 3. 4.2 Dielectric test levels shall be in accordance with the distribution levels in table 4 of ANSI/IE EE C57.12.00. 5 Impedance

42、voltage 5.1 Percent impedance voltage The percent impedance voltage, as measured on the rated voltage connection, shall be as follows: kVA Rating Percent impedance voltage 75 1.00 5.00 112 - 1/2 300 1.20 6.00 500 1.50 7.00 750 2500 5.75 5.2 Tolerance on impedance voltage The tolerance shall be as sp

43、ecified in 9.2 of ANSI/IEEE C57.12.00. 5.3 Tolerance on impedance voltage on a tap Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C57.12.22 - 1993 3 T

44、he percent departure of the tested impedance voltage on any tap from the tested imp edance voltage at rated voltage shall not be greater than the total tap voltage range and shall be expressed as a percentage of the rated voltage. 6 Tests 6.1 General Except as specified in 6.2, tests shall be perfor

45、med as specified in ANSI/IEEE C57.12. 00 and ANSI/IEEE C57.12.90. 6.2 Dielectric tests For wye - wye connected units, the transformer primary is designed for solidly grounded application, and no applied voltage test is required on the high - voltage winding. Induced voltage tests shall be perform ed

46、 by applying between the terminals of each winding a voltage that will develop from the high - voltage line terminals to ground a voltage of 1000 volts plus 3.46 times the rated transformer winding voltage, but in no case shall the line - to - ground voltage d eveloped exceed 40 000 volts for 125 kV

47、 BIL and 50 000 volts for 150 kV BIL. For this test, the neutral terminal shall be grounded. However, under conditions whereby the neutral terminal ground connection can be removed, both the applied voltage test and t he induced voltage test as specified in ANSI/IEEE C57.12.00 may be performed. 7 Co

48、nstruction 7.1 General A pad - mounted, compartmental - type transformer shall conform to ANSI C57.12.28 and consist of a tank with high - voltage and low - voltage cable terminat ing compartments, as shown in figure 2 or figure 5. The compartment shall be separated by a barrier of metal or other ri

49、gid material. 7.1.1 The high - voltage and low - voltage compartments shall be located side - by - side on one side of the transformer tank. W hen viewed from the front, the low - voltage compartment shall be on the right. 7.1.2 Each compartment shall have a door so constructed as to provide access to the high - vo