1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C37.51a-2010for Switchgear Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear AssembliesConformance Test Procedures Amendment 1: Short-Time Withstand Current TestsANSI C37.51a-2010 American National Standard for
2、Switchgear Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies Conformance Test Procedures Amendment 1: Short-Time Withstand Current Tests Secretariat: National Electrical Manufacturers Association Approved November 16, 2010 American National Standards Institute, Inc. ANSI C37.
3、51a-2010 NOTICE AND DISCLAIMER 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 pers
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13、e standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus re
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17、 Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require 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 calli
18、ng or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 North 17th Street, Rosslyn, VA 22209 Copyright 2010 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under
19、 the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, 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 writ
20、ten permission of the publisher. Printed in the United States of America i ANSI C37.51a-2010 This page intentionally left blank. ii ANSI C37.51a-2010 CONTENTS Foreword .iv Section 2 REFERENCED STANDARDS 1 5.6.1.2 Circuit breaker compartment NOT represented by the circuit breaker test enclosure 2 iii
21、 ANSI C37.51a-2010 Foreword (This Foreword is not part of American National Standard C37.51a-2010.) This amendment has been developed to coordinate selected conformance tests and procedures with ANSI/IEEE C37.20.1-2002 Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear, and particularly,
22、 to recognize the amendment C37.20.1a-2005. C37.51 is published separately from ANSI/IEEE C37.20.1-2002 and C37.20.1a-2005 to facilitate its use and to permit timely revisions based on experience. This standard has been prepared by a Working Group sponsored by the Power Switchgear Assemblies Technic
23、al Committee of the Switchgear Section of the National Electrical Manufacturers Association (NEMA 8-SG-V). During the course of its preparation, coordination has been maintained with the Switchgear Committee of the Power Engineering Society of the Institute of Electrical and Electronics Engineers. P
24、roposed or recommended revisions should be submitted to: Vice President, Technical Services National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, VA 22209 This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Power Switchgear C37.
25、 Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time of its approval, the C37 Committee had the following members: T. Olsen, Chair Gerard Winstanley, Secretary Organization Represented: Name of Representative: Electric Light an
26、d Power Group Dave Galicia Joseph Koepfinger Yasin MusaRod SaulsInstitute of Electrical and Electronics Engineers Michael Wactor John LeachAnne MorganNational Electrical Manufacturers Association Ted Olsen Charles Ball Keith FlowersR. W. Long Carl SchneiderRichard Yorkiv AMERICAN NATIONAL STANDARD A
27、NSI C37.51a-2010For SwitchgearMetal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear AssembliesConformance Test Procedures Amendment 1: Short-Time Withstand Current Tests NOTEThe editing instructions contained in this amendment define how to merge the material contained herein into the exist
28、ing base standard and its amendments to form the comprehensive standard. The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace. Change is used to make small corrections in existing text or tables. The editing instruction specifies
29、the location of the change and describes what is being changed by using strikethrough (to remove old material) and underscore (to add new material). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbe
30、ring instructions are given in the editing instruction. Replace is used to make large changes in existing text, subclauses, tables, or figures by removing existing material and replacing it with new material. Editorial notes will not be carried over into future editions because the changes will be i
31、ncorporated into the base standard. Section 2 REFERENCED STANDARDS Change Section 2 as follows: When there is a conflict between this standard and these referenced standards, this standard shall apply. This standard is intended to be used in conjunction with the following American National Standards
32、. When these referenced standards are superseded by a revision approved by the American National Standards Institute, Inc., the revisions shall apply. ANSI C37.16-2000 SwitchgearLow-Voltage Power Circuit Breakers and AC Power Circuit ProtectorsPreferred Ratings, Related Requirements, and Application
33、 Recommendations ANSI C37.50-1989 (R2000) SwitchgearLow-Voltage AC Power Circuit Breakers Used in EnclosuresTest Procedures ANSI/IEEE C37.09-1999 Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis ANSI/IEEE C37.13-1990 (R1995) Low-Voltage AC Power Circuit Breake
34、rs Used in Enclosures ANSI/IEEE C37.20.1-2002 Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear ANSI/IEEE C37.20.1a-2005 Metal-Enclosed Low-Voltage Power Circuit Breaker SwitchgearAmendment 1: Short-Time and Short-Circuit Withstand Current TestsMinimum Areas for Multiple Cable Connections
35、1 ANSI C37.51a-2010 ANSI/IEEE C37.26-2003 Standard Guide for Methods of Power Factor Measurement for Low-Voltage Inductive Test Circuits ANSI/IEEE C37.100-1992 (R2000) Definitions for Power Switchgear ANSI/IEEE Std 4-1995 Standard Techniques for High Voltage Testing, including ANSI/IEEE Std 4a-2001,
36、 Amendment to IEEE Standard Techniques for High-Voltage Testing 5.6.1.2 Circuit breaker compartment NOT represented by the circuit breaker test enclosure Change 5.6.1.2 as follows: If the circuit breaker compartment is not physically equivalent to the circuit breaker test enclosure, the withstand cu
37、rrent tests shall include a circuit breaker and compartment. The test shall be made under the same conditions that resulted in the highest let-through current during the circuit breaker short-circuit current tests described in ANSI C37.50-1989. The circuit breaker shall be of a type that has previou
38、sly met the design test performance requirements as specified in ANSI C37.50-1989, and shall be one of the following: a. a circuit breaker without direct acting trip devices b. a circuit breaker in which the overcurrent trip device has been made inoperative c. an equivalently sized dummy breaker pro
39、vided its primary disconnecting devices are identical to the circuit breaker, and the circuit breaker has been qualified by previous testing. The circuit breaker shall be located in the uppermost compartment, and for the tests, the circuit breaker compartment outgoing terminals shall be connected together by a shorting bar or bars. 2 NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
