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1、IEEE Std C37.20.7-2001 IEEE Standards C37.20.7 TM IEEE Guide for Testing Medium-Voltage Metal-Enclosed Switchgear for Internal Arcing Faults Published by The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA 20 May 2002 IEEE Power Engineering Society
2、 Sponsored by the Switchgear Committee IEEE Standards Print: SH94967 PDF: SS94967 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 21:00:38 MDTNo reproducti
3、on or networking permitted without license from IHS -,-,- IEEE Std C37.20.7-2001TM IEEE Guide for Testing Medium-Voltage Metal-Enclosed Switchgear for Internal Arcing Faults Sponsor Switchgear Committee of the IEEE Power Engineering Society Approved 7 December 2001 IEEE-SA Standards Board Abstract:A
4、 procedure for testing and evaluating the performance of medium-voltage metal- enclosed switchgear for internal arcing faults is covered in this guide. A method of identifying the capabilities of this equipment is given. Service conditions, installation, and application of equipment are also discuss
5、ed. Keywords:accessibility, arc, internal arcing fault, bus, compartment, metal-clad switchgear, metal-enclosed interrupter switchgear, metal-enclosed switchgear, overpressure, protection The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyrigh
6、t ? 2002 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 20 May 2002. Printed in the United States of America. Print: ISBN 0-7381-3076-1SH94967 PDF: ISBN 0-7381-3077-XSS94967 No part of this publication may be reproduced in any form, in an electronic ret
7、rieval system or otherwise, without the prior written permission of the publisher. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 21:00:38 MDTNo reproduct
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26、tworking permitted without license from IHS -,-,- IEEE-SA Trademark Usage/Compliance Statement Proper usage of the trademark IEEE Std C37.20.7.2001TMis mandatory and is to be followed in all references of the Standard. The mark IEEE?is the registered trademark of the Institute of Electrical and Elec
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31、02 IEEE. All rights reserved.iii Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 21:00:38 MDTNo reproduction or networking permitted without license from I
32、HS -,-,- Introduction (This introduction is not a part of IEEE Std C37.20.7-2001, IEEE Guide for Testing Medium-Voltage Metal- Enclosed Switchgear for Internal Arcing Faults.) The standards and guides in the C37 series have been developed over a period of many years through the cooperative eff orts
33、of users, specifi ers, manufacturers, and other interested parties. Failure within a switchgear assemblywhether from a defect, an unusual service condition, lack of maintenance, or mis-operationmay initiate an internal arc. There is little likelihood of an internal arc in equipment meeting the requi
34、rements of IEEE Std C37.20.2-1999 or IEEE Std C37.20.3-2001,abut the possibility cannot be completely disregarded. The intent of this guide is to address the testing procedure for internal arcing faults in metal-enclosed switchgear. In the 1970s, principally in Europe, interest arose in evaluating e
35、lectrical equipment under conditions of internal arcing. As a result, a draft Annex AA to IEC 298, A.C. Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to and Including 52kV, was prepared in 1976 and approved by the IEC in 1981. The present edition of IEC 298 (currently
36、 IEC 60298 B1)bwas approved in 1990. Knowledge of the arc resistance testing guide in IEC 298 spread to North America and was used as the basis for EEMAC G14-1, 1987, Procedure for Testing the Resistance of Metal-Clad Switchgear Under Conditions of Arcing Due to an Internal Fault. EEMAC G14-1 incorp
37、orated improvements in knowledge and understanding in more than a decade of use of Annex AA of IEC 298-1981 in Europe. The development of IEEE Std C37.20.7-2001 rests heavily on Annex AA of IEC 298-1981 and Amendment 1-1994, and incorporates many of the refi nements originated in EEMAC G14-1. Even w
38、hen arc-resistant construction is specifi ed, it is strongly recommended that supplemental power system protection be provided. This supplemental protection should limit the total energy that can be delivered in the event of internal arcing faults. This protection can be provided in a variety of way
39、s, depending on the nature of the system. Among the forms of protection that may be appropriate are current-limiting fuses on the primary side of power transformers, zone diff erential or bus diff erential relaying, ground diff erential protection, or arc sensing systems sensitive to light or pressu
40、re eff ects that accompany internal arcing faults. The objective of such protection must be to cause the interruption of all sources of power to the arcing fault in a time interval that is shorter than the arcing duration capability demonstrated by the tests contained within this guide (see 4.3). iv
41、Copyright ? 2002 IEEE. All rights reserved. aInformation on references can be found in Clause 2. bThe numbers in brackets correspond to those of the bibliography in Annex B. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Empl
42、oyees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 21:00:38 MDTNo reproduction or networking permitted without license from IHS -,-,- Participants The Standards Committee on Power Switchgear, C37, who reviewed and approved this guide, had the following personnel at the time of approv
43、al: E. R. Byron, Chair M. Calwise, Co-Secretary, NEMA N. Ahmad, Co-Secretary, IEEE D. L. Swindler, Executive Vice-Chair of IEC Activities Organization RepresentedName of Representative Electric Light however, special consideration must be given to the building size and construction for indoor applic
44、ations (not addressed by this guide). The tests and assessments described in this guide are only applicable to arcing faults occurring entirely in air within the enclosure when all doors and covers are properly secured. This guide does not apply to arcing faults that occur within a component of the
45、switchgear assembly, such as instrument transformers, sealed interrupting devices, fuses, etc. Switchgear designs that meet the requirements of this guide will be referred to as arc-resistant metal- enclosed interrupter switchgear or arc-resistant metal-clad switchgear as applicable, or, generally,
46、as arc-resistant switchgear. 1.2 Background 1.2.1 Consequences of internal arc faults The occurrence of arcing inside switchgear produces a variety of physical phenomena. For example, the arc energy resulting from an arc developed in air at atmospheric pressure will cause a sudden pressure increase
47、inside the enclosure and localized overheating. This results in both severe mechanical and thermal stresses on the equipment. Moreover, the materials involved in or exposed to the arc can produce hot decomposition products, either gaseous or particulates, which could be discharged to the outside of
48、the enclosure. The procedures outlined in this guide make it possible to evaluate the eff ect of abnormal internal pressure acting on properly latched or secured covers, doors, inspection windows, etc. The procedures Copyright ? 2002 IEEE. All rights reserved.1 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 21:00:38 MDTNo reproduction or networking permitted without license from IHS -,-,- also take into consideration the thermal eff ects of the