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1、IEEE Std C37.013-1997 Interpretation IEEE Standards Interpretations for IEEE Std 37.013-1997 Copyright 2005 by the Institute of Electrical and Electronics Engineers, Inc. Three Park Avenue New York, New York 10016-5997 USA All Rights Reserved. This is an interpretation of IEEE Std 37.013-1997. Inter
2、pretations are issued to explain ad clarify the intent of a standard and are not intended to constitute an alteration to the original standard or to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduc
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4、New Jersey 08855-1331, USA May 2005 Interpretation #1 Does the Scope of IEEE Std C37.013-1997 include the generator circuit breakers for an application of this nature? A review of the Standard would suggest not for the following reasons: 1) Subclass 5.3 Rated continuous current. This subclause state
5、s that typical values are 6.3kA, 8kA,20kA, etc. In the application under consideration, the circuit breaker rated current is 0.63kA. 2) Subclause 5.8.1 Rated short-circuit current. This subclause states that typical values are http:/standards.ieee.org/reading/ieee/interp/C37.013-1997.html (1 of 3) 2
6、009/01/06 6:38:38 PM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/06/2009 02:39:18 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.013-1997 Inte
7、rpretation 63kA, 80kA, 160kA, etc. In the application under consideration, the circuit breaker rated short-circuit current is 25kA. 3) Subclause 5.8.2.5 Required interrupting capability for single-phase-to-ground faults. This subclause states that: “Generator circuit breakers are designed for use on
8、 high- impedance grounded systems where the single phase-to ground short-circuit current will not exceed 50 A. In no case are the capabilities for single phase-to-ground faults required to exceed this value.” As is quite often the case with diesel-driven generator applications, we propose low resist
9、ance grounding of the Generator neutral, as allowed for in IEEE Std 143 Application Guide for Grounding of Synchronous Generator Systems. The current would not be limited to 50 A, as required by this subclause. 4) Subclause 6.3.3.5 Interrupting capability for single-phase-to-ground faults. This subc
10、lause states that: “As all known applications of generator circuit breakers are for high- impedance grounded systems, the single-phase-to-ground short-circuit current is always significantly lower than the three-phase short-circuit current and its demonstration is included with the three-phase short
11、-circuit current test defined in 6.2.3.1.” The application would not be high impedance grounded as already stated in item 3) above. 5) Clause 7. Application guide. This Clause refers to a typical example in Annex A. This example shows a Generator unit rated 588 MVA; a factor of 100 times the rating
12、of the Generator in the application under consideration. Interpretation #1 IEEE Std C37.013-1997 The original document was aimed at circuit breakers for protecting generators and main step- up unit transformers like those applied in the largest power generating stations. This was mostly because the
13、engineers who developed the original IEEE Std C37.013 document had experience mainly with the larger applications and they had little experience with the smaller applications. The result was that there is too little information specifically about Gen. CBs for use with smaller generators. Concerns si
14、milar to yours have been addressed in the new supplement to IEEE Std C37.013, which is identified as PC37.013a, and is titled Draft Standard for AC High Voltage Generator Circuit Breakers Rated on a Symmetrical Current Basis Amendment 1: Supplement for use with Generators Rated 10-100 MVA IEEE PC37.
15、013a is focused on breakers for generators rated in the 10-100 MVA range, though http:/standards.ieee.org/reading/ieee/interp/C37.013-1997.html (2 of 3) 2009/01/06 6:38:38 PM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=HP Moni
16、toring/1111111164 Not for Resale, 02/06/2009 02:39:18 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.013-1997 Interpretation your concern is for breakers applied with machines smaller than that, it is getting closer, and would be within the right “order of mag
17、nitude.“ Back to Available IEEE Standards Interpretations Online Copyright IEEE-SA Contact IEEE-SA For questions or comments, please contact the IEEE-SA Webmaster. http:/standards.ieee.org/reading/ieee/interp/C37.013-1997.html (3 of 3) 2009/01/06 6:38:38 PM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/06/2009 02:39:18 MSTNo reproduction or networking permitted without license from IHS -,-,-