1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C12.11-2006 (R2014)Instrument Transformers for Revenue Metering 10kV BIL through 350 kV BIL (0.6 kV NSV through 69 kV NSV)ANSI C12.11-2006 (R2014) American National Standard for Instrument Transformers for Revenue Metering 1
2、0kV BIL through 350 kV BIL (0.6 kV NSV through 69 kV NSV) Secretariat: National Electrical Manufacturers Association Approved: May 27, 2014 Published: June 27, 2014 American National Standards Institute, Inc. 2014 National Electrical Manufactures Association NOTICE AND DISCLAIMER (ANSI Accredited St
3、andards Committee) The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participa
4、ting in the development of this document. ANSI standards, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered
5、by this publication. As Secretary of the ANSI Accredited Standards Committee, NEMA administers the process in accordance with the procedures of the American National Standards Institute to promote fairness in the development of consensus. As a publisher of this document, NEMA does not write the docu
6、ment and it does not independently test, evaluate or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property or other damages of any nature whatsoever, w
7、hether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or completeness of any information published her
8、ein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue of this standard or guide. In publishin
9、g and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity. Nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independ
10、ent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for
11、 additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test or inspect products, designs or installations for safety or health purposes. Any certification or
12、 other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. C12.11-2006 (R2014) Page i 2014 National Electrical Manufactures Association AMERICAN NATIONAL S
13、TANDARD 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, substantia
14、l 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 resolution. The us
15、e of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American Nation
16、al Standards Institute does not develop standards and will in no circumstances give an interpretation of 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 Standards In
17、stitute. Requests for interpretations should 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 Institute require
18、that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 130
19、0 North 17th Street, Suite 900, Rosslyn, VA 22209 Copyright 2014 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works,
20、 and the International and Pan American Copyright Conventions. No 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. Printed in the United States of America C12.11-2006 (R2014) Page ii 2014 Na
21、tional Electrical Manufactures Association C12.11-2006 (R2014) Page iii 2014 National Electrical Manufactures Association Contents Page 1 Scope 1 2 References . 1 3 Definitions . 1 3.1 Accuracy Class . 1 3.2 Indoor Applications of Instrument Transformers 1 4 General Requirements 1 4.1 IEEE Std C57.1
22、3 Provisions 1 4.2 Metric Conversion . 2 4.3 Space for User Identification . 2 4.4 Serial Numbers . 2 5 Current Transformers . 2 5.1 Nameplates . 2 5.1.1 Ratio Marking Syntax . 2 5.1.2 Ratio Marking . 2 5.1.3 Tapped-secondary Current Transformer Secondary Terminal Indication . 2 5.1.4 Indoor Applica
23、tion Rating Factor . 2 5.1.5 Bar Code 2 5.2 Primary Rating Marking on Body of Current Transformers 2 5.3 Terminals 3 5.3.1 Primary Terminals 3 5.3.2 Secondary Terminals and Voltage Terminals 3 5.4 Polarity Marking 3 5.4.1 Polarity Marking Permanence 3 5.4.2 Polarity Marking Contrast 3 5.4.3 Polarity
24、 Marking Relief . 3 5.4.4 Primary and Secondary Polarity Marks 3 5.4.5 Direct Burial Polarity Marking. 3 5.5 Test Card 3 5.6 Effect of Cooling Air Temperature on Permissible Temperature Rise for 55 C Rise Transformers 4 5.7 Indoor and Outdoor Current Transformers, 10 kV BIL (0.6 kV NSV) . 4 5.7.1 El
25、ectrical Characteristics and Dimensions 4 5.7.2 Current Ratings 4 5.8 Indoor Current Transformers, 60 kV BIL through 110 kV BIL (4.8 kV NSV through 14.4 kV NSV) . 12 5.8.1 Electrical Characteristics and Dimensions 12 5.8.2 Current Ratings 14 5.9 Outdoor Current Transformers, 60 kV BIL through 110 kV
26、 BIL (4.8 kV NSV through 14.4 kV NSV) . 14 5.9.1 Electrical Characteristics and Dimensions 14 5.9.2 Current Ratings 14 5.10 Small-Size Outdoor Current Transformers, 125 kV BIL through 200kV BIL (25 kV NSV through 34.5 kV NSV) . 14 5.10.1 Electrical Characteristics and Dimensions 14 5.10.2 Current Ra
27、tings 14 5.11 Large-Size Outdoor Current Transformers, 150 kV BIL through 350 kV BIL (25 kV NSV through 69 kV NSV) 15 5.11.1 Electrical Characteristics and Dimensions 15 5.11.2 Current Ratings 15 6 Voltage Transformers . 20 6.1 Terminals 20 6.1.1 Primary Terminals 20 C12.11-2006 (R2014) Page iv 2014
28、 National Electrical Manufactures Association 6.1.2 Secondary Terminals . 20 6.2 Identification 20 6.2.1 Terminal Identification 20 6.2.2 Rated Voltage Identification . 20 6.3 Test Card 20 6.4 Construction 20 6.4.1 Nameplates 20 6.4.2 Bar Code 21 6.5 Effect of Cooling Air Temperature on Permissible
29、Temperature Rise for 55 C Rise Transformers 21 6.6 Indoor or Outdoor Voltage Transformers, 10 kV and 30 kV BIL, and Indoor Voltage Transformers, 60 kV through 110 kV BIL . 21 6.6.1 Electrical Characteristics and Dimensions 21 6.6.2 Rated Voltages 21 6.7 Outdoor Voltage Transformers, 60 kV BIL throug
30、h 110 kV BIL 22 6.7.1 Electrical Characteristics and Dimensions 22 6.7.2 Rated Voltages 22 6.8 Small-Size Outdoor Voltage Transformers, with One Bushing, 125 kV through 200 kV BIL 25 6.8.1 Electrical Characteristics and Dimensions 25 6.8.2 Rated Voltages 26 6.9 Small-Size Outdoor Voltage Transformer
31、s, with Two Bushings, 125 kV through 200 kV BIL 26 6.9.1 Electrical Characteristics and Dimensions 26 6.9.2 Rated Voltages 26 6.10 Large-Size Outdoor Voltage Transformers, with One Bushing, 150 kV BIL through 350 kV BIL . 26 6.10.1 Electrical Characteristics and Dimensions 26 6.10.2 Rated Voltages 2
32、6 6.11 Large-Size Outdoor Voltage Transformers, with Two Bushings, 150 kV BIL through 350 kV BIL . 27 6.11.1 Electrical Characteristics and Dimensions 27 6.11.2 Rated Voltages 27 Annex A: Circle Method for Determination of Voltage Transformer Accuracy 31 Annex B: Suggested Utility Practices on Field
33、 Application of Current Transformers 33 B.1 Determination of 55 C Rise Current Transformer Capacity 33 B.2 Geographic Area . 33 B.3 Determination of 55 C Rise Current Transformer Replacement Need . 33 B.4 Determination of 55 C Rise Current Transformer Sizes for Specific Loading Conditions . 34 B.4.1
34、 Replacement of Existing CTs on Primary Service* (Primary Service is 2 kV or greater) . 34 B.4.2 Replacement of Existing CTs on Secondary Service (Secondary Service is 600 V or less) 34 Annex C: Bar Code . 35 C.1 Bar Code Characters 35 C.2 Bar Code Size and Format . 35 C.3 Bar Code Example 37 Annex
35、D: Historical Background . 38 D.1 Foreword to ANSI C12.11-1987 38 Tables 1 Current Ratings in Amperes for Small-Size Outdoor Current Transformers, 125 kV BIL through 200 kV BIL (25 kV NSV through 345 kV NSV) . 14 2 Current Ratings in Amperes for Large-Size, Outdoor Current Transformers, 150 kV BIL t
36、hrough 350 kV BIL (25 kV NSV through 69 kV NSV) 15 3 Electrical ratings for Indoor or Outdoor Voltage Transformers, 10 kV and 110 kV BIL . 21 4 Electrical Ratings for Small-Size Outdoor Voltage Transformers, with One Bushing, 125 kV through 200 kV BIL 26 C12.11-2006 (R2014) Page v 2014 National Elec
37、trical Manufactures Association 5 Electrical Ratings for Small-Size Outdoor Voltage Transformers, with Two Bushings, 125 kV through 200 kV BIL 26 6 Electrical Ratings for Large-Size Outdoor Voltage Transformers, with One Bushing, 150 kV through 350 kV BIL 27 7 Electrical Ratings for Large-Size Outdo
38、or Voltage Transformers, with Two Bushings, 150 kV through 350 kV BIL 27 Figures 1 Small-Size Window-Type Current Transformers, 10 kV BIL . 5 2 Intermediate-Size Window-Type Current Transformers, 10 kV BIL 6 3 Large-Size Window-Type Current Transformers, 10 kV BIL . 7 4 Large-Size Window-Type Curren
39、t Transformers, 10 kV BIL . 8 5 Small-Size Wound or Bar-Type Current Transformers, 10 kV BIL . 9 6 Intermediate-Size Wound or Bar-Type Current Transformers, 10 kV BIL 10 7 Large-Size Wound or Bar-Type Current Transformers 10 kV BIL 11 8 Window-Type Current Transformers, 10 kV BIL for Application in
40、Secondary Compartment of Pad-Mounted Distribution Transformers . 12 9 Indoor Current Transformers, 60 kV BIL through 110 kV BIL . 13 10 Outdoor Current Transformers, 60 kV BIL through 110 kV BIL 16 11 Small-Size Outdoor Current Transformers, 125 kV BIL through 200 kV BIL 17 12a Large-Size Outdoor Cu
41、rrent Transformers, 150 kV BIL through 350 kV BIL 18 12b Primary Terminal Dimensions for Large- Size Outdoor Current Transformers, 150 kV BIL through 350 kV BIL . 19 13 Indoor or Outdoor Voltage Transformers, 10 kV BIL through 30 kV BIL Indoor Voltage Transformers, 60kV BIL through 110 kV BIL 23 14
42、Outdoor Voltage Transformers, 60 kV BIL through 110 kV BIL 24 15 Small-Size Outdoor Voltage Transformers, with One Bushing, 125 kV BIL through 200 kV BIL . 25 16 Small-Size Outdoor Voltage Transformers, with Two Bushings, 125 kV BIL through 200 kV BIL . 28 17 Large-Size Outdoor Voltage Transformers,
43、 with One Bushing, 150 kV BIL through 350 kV BIL . 29 18 Large-Size Outdoor Voltage Transformers, with Two Bushings, 150 kV BIL through 350 kV BIL . 30 C12.11-2006 (R2014) Page vi 2014 National Electrical Manufactures Association C12.11-2006 (R2014) Page vii 2014 National Electrical Manufactures Ass
44、ociation Foreword (This Foreword is not part of American National Standard C12.11-2006 (R2014).) This Standard was developed by the Accredited Standards Committee on Electricity Metering, C12, for full consensus approval as an American National Standard. This revised edition supersedes ANSI C12.11-1
45、987. The new edition differs from the previous one in both technical and editorial content. Besides several minor revisions, technical changes include: increased focus on Current Transformer Rating Factors when ambient temperature is not 30 C, and revisions to Rating Factor and Burden & Accuracy per
46、formance to fit established industry practice. Editorial revisions included the redrawing of all figures. This Standard provides recommended minimum requirements for current and voltage transformers used for electricity metering. It is to be used in conjunction with the latest revision of IEEE C57.1
47、3 and IEEE Std C57.13.6. Comments on standards and requests for interpretations should be addressed to ANSI Committee C12 Secretary, National Electrical Manufacturers Association, 1300 North 17th Street, Rosslyn, Virginia, 22209. This Standard was processed and approved for submittal to ANSI by Accr
48、edited Standards Committee on Electricity Metering C12. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time of its approval, the C12 Committee had the following members: Tom Nelson, Chairman Paul Orr, Secretary Organization Rep
49、resented Name of Representative Ameren Services J. West Austin Energy H. Millican Baltimore Gas & Electric Company J. Thurber Center for Neighborhood Technology L. Kotewa Consumers Energy D. Jirikovic DTE Energy K. Tolios Duke Power Company T. Morgan Elster Solutions S. Weikel EnerNex Corporation A. Snyder Florida Power & Light J. DeMars Future DOS R&D Inc. A. Moise GE Energy C. Crittenden Georgia Power L. Barto Itron, Inc. B. Cain JECARRCO, LLC J. Carr Landis+Gyr J. Voisine MET Laboratories, Inc. J. Reed Milbank Manufacturing Co. S. Glasgow National Institute of
