IEEE C37 04B-2008 en Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis Amendment 2 To Change the Description of Transie.pdf
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1、IEEE Std C37.04b-2008(Amendment to IEEE Std C37.04 -1999) IEEE Standard for Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis Amendment 2: To Change the Description of Transient Recovery Voltage for Harmonization with IEC 62271-100IEEE3 Park Avenue New York,
2、NY 10016-5997, USA3 April 2009IEEE Power +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Authorized licensed use limited to: IHS Stephanie Dejesus. Downloaded on April 17, 2009 at
3、02:30 from IEEE Xplore. Restrictions apply.Introduction This introduction is not part of IEEE Std C37.04-2008, IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current BasisAmendment 2: To Change the Description of Transient Recovery Voltage for Harmonizatio
4、n with IEC 62271-100. This standard has been revised to change the TRV descriptions to harmonize with IEC 62271-100 (Ed. 1.1)-2003 (formerly IEC 60056)aper Amendment 1 17A-625-FDIS as produced by IEC SC17A/WG23, which is a joint IEC and IEEE Working Group on the Harmonization of Power Test Procedure
5、s for AC High Voltage Circuit Breakers. Consistent with the changes discussed in this amendment of IEEE Std C37.04TM, changes are also proceeding in parallel in other standards to align the text and preferred ratings values with these new TRV requirements. The other standards being revised concurren
6、tly are IEEE Std C37.06TM, ANSI C37.06, IEEE Std C37.09TM-1999, and IEEE Std C37.011TM-2005. The major changes implemented in this amendment are listed as follows. The TRV capability of circuit breakers according to this amendment to IEEE Std C37.04 is described by two- or four-parameter envelopes i
7、n place of 1-cosine and exponential-cosine envelopes. For breakers rated 100 kV and above, the TRV envelope is defined by four parameters where the short-circuit currents are above 30% of the breakers capability. At 30% and below, the TRV envelope is described by two parameters. For breakers rated 7
8、2.5 kV and below, the TRV envelope is described by two parameters over the entire current range. Three-phase to ground faults are the basis for rating, in accordance with the present and revised IEEE Std C37.04-1999: a) 1) 2) b) 1) 2) For circuit breakers applied on systems less than 100 kV, the TRV
9、 ratings assume that the systems can be operated ungrounded. This is equivalent to defining three-phase ungrounded faults as the basis for rating. There are two choices for TRVs on systems less than 100 kV. The first choice is for line connected systems, and the TRV values are those referred to as o
10、utdoor circuit breakers in prior revisions of ANSI standards. The second choice is for cable connected systems, and the TRV values are those found in IEC 62271-100 (Ed. 1.1)-2003 and are similar to the values for indoor circuit breakers in prior revisions of ANSI standards. For circuit breakers appl
11、ied on systems of 100 kV and above, there is also a choice: For systems 100 kV through 170 kV, the systems can be operated either ungrounded or effectively grounded so two TRV ratings are available for these systems. For systems 245 kV and above, the preferred TRV ratings assume that the systems are
12、 all effectively grounded, and the first-pole-to-clear factor is 1.3, which is similar to the approach taken by the IEC. There is also another table of values based on a first-pole-to-clear factor of 1.5 that provides alternative TRV values, which are similar to the prior revision of ANSI standards
13、that use the three-phase ungrounded fault as the basis of rating. Annex A: The methods of drawing TRV envelopes are included to illustrate the application of the four-parameter and two-parameter methods of drawing TRV envelopes to various examples. aInformation on references can be found in Clause 2
14、. iv Copyright 2009 IEEE. All rights reserved. Authorized licensed use limited to: IHS Stephanie Dejesus. Downloaded on April 17, 2009 at 02:30 from IEEE Xplore. Restrictions apply. Annex B: A comparison between the TRV terminology and symbols is included as a cross-reference of TRV terms between th
15、ose terms previously used in IEEE standards and those now employed in this standard and in IEC standards. Annex C: TRV envelopes. Annex D: TRV multipliers for related required capabilities. Annex E: The origin of out-of-phase TRV envelopes and values is included to explain the reasoning behind the c
16、hoices for out-of-phase TRV descriptions. Annex F: A list of references is included to provide the background for various statements made in this standard about the historical origin of TRV descriptions and values and of the system study basis for recent revisions. Notice to users Laws and regulatio
17、ns Users of these documents should consult all applicable laws and regulations. Compliance with the provisions of this standard does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory re
18、quirements. IEEE does not, by the publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights This document is copyrighted by the IEEE. It is made available for a wide variety of both public and
19、private uses. These include both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making this document available for use and adoption by public authorities and private users, the IEEE does not
20、waive any rights in copyright to this document. Updating of IEEE documents Users of IEEE standards should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of amendments, corrigenda, or errata. An offi
21、cial IEEE document at any point in time consists of the current edition of the document together with any amendments, corrigenda, or errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of amendments, corrig
22、enda, or errata, visit the IEEE Standards Association web site at http:/ieeexplore.ieee.org/xpl/standards.jsp, or contact the IEEE at the address listed previously. For more information about the IEEE Standards Association or the IEEE standards development process, visit the IEEE-SA web site at http
23、:/standards.ieee.org. v Copyright 2009 IEEE. All rights reserved. Authorized licensed use limited to: IHS Stephanie Dejesus. Downloaded on April 17, 2009 at 02:30 from IEEE Xplore. Restrictions apply.Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:/
24、standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/.Patents Attention is called to the possibility that i
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