1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA C37.50-2012Switchgear Low Voltage AC Power Circuit Breakers Used in Enclosures Test ProceduresANSI C37.50-2012 American National Standard Switchgear Low Voltage AC Power Circuit Breakers Used in Enclosures Test Procedur
2、es Secretariat: National Electrical Manufacturers Association Approved February 2012 Published November 29, 2012 American National Standards Institute, Inc. C37.50-2012 Page ii Copyright 2012 by the National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publicati
3、on 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 participating in the development of this document. American N
4、ational Standards Institute (ANSI) standards and guideline publications, 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
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12、MA and is solely the responsibility of the certifier or maker of the statement.C37.50-2012 Page iii Copyright 2012 by the National Electrical Manufacturers Association AMERICAN NATIONAL STANDARD Approval of an American National Standard requires verification by ANSI that the requirements for due pro
13、cess, 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, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more
14、 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 use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone
15、, 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 National Standards Institute does not develop standards and will in no circumstances give an interpretation of any Amer
16、ican 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 Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the
17、 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 that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National
18、 Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 North 17th Street, Rosslyn, VA 22209 g164 Copyright 2012 by National Electrical Manufacturers Association All r
19、ights reserved including translation into other languages, reserved under 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 for
20、m, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Printed in the United States of America.C37.50-2012 Page iv Copyright 2012 by the National Electrical Manufacturers Association C37.50-2012 Page v Copyright 2012 by the National Electrical Manuf
21、acturers Association Table of Contents Page 1 SCOPE . 1 2 REFERENCES . 1 3 GENERAL TEST CONDITIONS AND REQUIREMENTS . 2 4 DESIGN TEST REQUIREMENTS . 2 4.1 General 2 4.2 Specific Test Requirements . 2 4.3 Test Conditions 3 4.4 Direct-Acting Overcurrent Trip Devices . 6 4.5 AC Dielectric Withstand-Vol
22、tage Test 8 4.6 Continuous-Current Test 9 4.7 Overload Switching Test 11 4.8 Endurance Tests 12 4.9 Short-Circuit Current Tests 13 4.10 Short-Time Current Test 20 5 ACCESSORY DEVICES 21 5.1 General 21 5.2 Alarm and Auxiliary Switches . 21 5.3 Undervoltage Trip Devices . 22 5.4 Mechanical Accessory D
23、evices . 24 6 TREATMENT OF FAILURES WITHIN TEST SEQUENCES 24 7 PRODUCTION TESTS 24 7.1 General 24 7.2 Calibration 24 7.3 Control, Secondary Wiring, and Devices Check Test 25 7.4 AC Dielectric Withstand Test . 25 7.5 No-Load Operation Test 25 7.6 Open-Fuse Trip Device 25 8 PRODUCTION MONITORING AND P
24、RODUCT RETEST REQUIREMENTS . 26 8.1 General 26 8.2 Production Monitoring 26 8.3 Product Retest Requirements 26 Tables 1 Test Sequences.5 2 Copper Conductors for Use in Continuous Current Tests10 3 Fused Circuit Breaker Intermediate Short Circuit Tests14 4 Short Circuit Tests.15 5 Overload Test Condi
25、tions.22 6 Endurance Test Conditions23 7 Retest Series (Unfused Circuit Breakers)27 C37.50-2012 Page vi Copyright 2012 by the National Electrical Manufacturers Association FOREWORD (This Foreword is not part of American National Standard C37.50-2012.) This standard was first published in 1973 as a r
26、eplacement for section 9 (Test Requirements) of American National Standard for Low-Voltage AC Power Circuit Breakers (600-Volt Insulation Class), ANSI C37.13-1969. In 1975, ANSI C37.50a-1975 American National Standard Test Procedures for Low-Voltage AC Integrally Fused Power Circuit Breakers, then a
27、 supplement, was published as a replacement for section 8 (Test Requirements) of ANSI C37.28-1969 Standard for Low-Voltage AC Integrally Fused Power Circuit Breakers and section 8 of ANSI C37.13a-1975. The contents of ANSI C37.50-1973 and C37.50a-1975 were combined for ANSI C37.50-1981 in accordance
28、 with the IEEE Low-Voltage Switchgear Devices Subcommittee revision and combination of ANSI C37.13-1969 and ANSI C37.13a-1975 into ANSI/IEEE C37.13-1981. The 1989 revision of the 1981 standard was developed to clarify miscellaneous areas of interpretation within the document. The present revision in
29、cludes changes to coordinate with updated requirements in ANSI/IEEE C37.13 and with the rating structure in ANSI/IEEE C37.16, as well as accepting the trip system design and production test requirements from ANSI/IEEE C37.17. This standard was originally written as a description of design test requi
30、rements and the performance criteria outlined established the basis for certification of low voltage ac-power circuit breakers used in enclosures for use in nonutility installations subject to regulation by public authorities and similar agencies concerned with laws, ordinances, regulations, adminis
31、trative orders, and similar instruments. It was established as a separate document to facilitate its use by test laboratories and its timely revision based on experience. This revision supports that original proposition. Experience has also indicated that there have been misinterpretations regarding
32、 the testing requirements for field design-change modifications. This has resulted in circuit breaker modifications without sufficient testing to properly recertify the modified products. Any change to a basic design should be coordinated with the original manufacturer. Otherwise, the original certi
33、fication responsibility cannot be continued. Conversions of circuit breakers are discussed in detail in ANSI/IEEE C37.59 Requirements for Conversion of Power Switchgear Equipment. This standard was prepared by a working group sponsored by the Power Switchgear Assemblies Technical Committee of the Sw
34、itchgear Section of the National Electrical Manufacturers Association (NEMA 8SG-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. Through this joint effor
35、t over many years, the switchgear assemblies standards have been of extreme value to the industry and further suggestions for improvement gained in the use of this standard will be welcomed. Suggestions for improvement of this standard will be welcome. They should be sent to: National Electrical Man
36、ufacturers Association 1300 North 17th Street Rosslyn, VA 22209 C37.50-2012 Page vii Copyright 2012 by the National Electrical Manufacturers Association This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Power Switchgear C37. Committee approval of the
37、 standard does not necessarily imply that all committee members voted for its approval. At the time of its approval, the ASC C37 Committee had the following members: T. W. Olsen, Chair G. MacFadden, Secretary Organizations Represented: Name of Representative: Electric Light and Power Group D. E. Gal
38、icia J. L. Koepfinger D. Lemmerman A. Morgan R. SaulsInstitute of Electrical and Electronics Engineers K. Flowers J. LeachA. Morgan C. Reigart R. SaulsM. Wactor National Electrical Manufacturers Association C. Ball K. FlowersR. W. Long S. MeinersD. Moser T. W. Olsen C. SchneiderInternational Electri
39、cal Testing Association A. Peterson Testing Laboratory Group P. Barnhart The following members composed the NEMA Power Switchgear Assemblies Technical Committee at the time of publication of this standard: C. Schneider, Chair G. MacFadden, Secretary C. Ball J. Baskins A. Bonner E. Byron K. Flowers L
40、. Grahor R. W. Long D. Moser T. W. Olsen C. Schneider R. Yanniello C37.50-2012 Page viii Copyright 2012 by the National Electrical Manufacturers Association The following members of the NEMA Power Switchgear Assemblies Technical Committee worked on this standard prior to its publication: K. Flowers,
41、 Chair B. Long T. W. Olsen C. Schneider R. Yanniello C37.50-2012 Page ix Copyright 2012 by the National Electrical Manufacturers Association C37.50-2012 Page 1 Copyright 2012 by the National Electrical Manufacturers Association AMERICAN NATIONAL STANDARD ANSI C37.50-2012 Low Voltage AC Power Circuit
42、 Breakers Used in EnclosuresTest Procedures 1 SCOPE This standard covers the test procedures for enclosed low-voltage ac power circuit breakers as follows: a) Stationary or drawout circuit breakers of two-or three- or four-pole construction, with one or more rated maximum voltages of 635 V (600 for
43、units incorporating fuses), 508 V, and 254 V for application on systems having nominal voltages of 600, 480, and 240 V. b) Unfused or fused type circuit breakers c) Manually operated or power-operated circuit breakers with or without electromechanical or solid-state trip devices. d) Fused drawouts c
44、onsisting of current-limiting fuses in a drawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a non-integrally fused circuit breaker. Note: In this standard the term circuit breaker shall mean enclosed low-voltage ac power circuit breaker, either fu
45、sed or unfused. The term unfused circuit breaker shall mean a circuit breaker without either integrally or non-integrally mounted fuses, and the term fused circuit breaker shall mean a circuit breaker incorporating either integrally or non-integrally mounted current limiting fuses. This document app
46、lies to both integrally and nonintegrally fused circuit breakers. 2 REFERENCES The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
47、ding any amendments or corrigenda) applies. ANSI/IEEE 4 Standard Techniques for High-Voltage Testing ANSI/IEEE C37.09-1999 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis ANSI/IEEE C37.13-2008 Standard for Low-Voltage AC Power Circuit Breakers Used i
48、n Enclosures ANSI/IEEE C37.16-2009 Standard for Preferred Ratings, Related Requirements, and Application Recommendations for Low-Voltage AC (635V and below) and DC (3200V and below) Power Circuit Breakers ANSI/IEEE C37.17 Standard for Standard for Direct-Acting Trip Systems for Low-Voltage (1000 V a
49、nd below) AC and General Purpose Low Voltage (1500 V and below) DC Power Circuit Breakers ANSI/IEEE C37.26 Guide for Methods of Power-Factor Measurement for Low-Voltage Inductive Test Circuits ANSI/IEEE C37.90.1 Standard for Surge Withstand Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus ANSI/IEEE C37.90.2 Standard for Withstand Capability of Relay Systems t
