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1、IEEE Std C37.14-2002 (Revision of IEEE Std C37.14-1999) IEEE Standards C37.14 TM IEEE Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures Published by The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA 18 April 2003 IEEE Power En
2、gineering Society Sponsored by the Switchgear Committee IEEE Standards Print: SH95074 PDF: SS95074 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:55:21 MDTNo
3、 reproduction or networking permitted without license from IHS -,-,- 25 The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2003 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 25 April 2003.
4、Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent manually or power-operated; and with or without electromechanical or electronic trip devices. It deals with service conditions, ratings, func- tional components, temperature limitations and classification of i
5、nsulating materials, dielectric with- stand voltage requirements, test procedures, and application. Keywords: current-limiting, general purpose, high-speed, impulse trip device, reverse-current trip device, semi-high-speed or rectifier circuit breaker Copyright The Institute of Electrical and Electr
6、onics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:55:21 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Standards documents are developed within the IEEE Societies and the Stand
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23、 of those patents that are brought to its attention. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:55:21 MDTNo reproduction or networking permitted without
24、license from IHS -,-,- Copyright 2003 IEEE. All rights reserved.iii Introduction (This introduction is not part of IEEE Std C37.14-2002, IEEE Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures.) IEEE Std C37.14-1979 superseded IEEE Std C37.14-1969 to properly recognize the widespr
25、ead use of solid-state rectifiers in industry, particularly for the traction power systems that evolved in the 1970s. It was based on known applications as well as considerations for future system development, with basic ratings and tests evolving from the classic mathematical solutions available at
26、 the time. The revision working groups for IEEE Std C37.14-1992 concluded that certain major changes were neces- sary. One of the changes made was the replacement of the 1200 V maximum design rating, with a new 1000 V rating. Dielectric withstand test voltages were correspondingly increased. The 199
27、9 revision of IEEE Std C37.14 reestablished the 1200 V maximum design rating, and removed the 1000 V maximum design rating, while keeping the increased dielectric withstand voltages. This change rec- ognized the existence of installed 1200 V maximum design rated systems and also maintained a more un
28、i- form division between steps of preferred maximum design ratings. IEEE Std C37.14-1999 also clarified endurance design test requirements in order to eliminate confusion on the number of electrical operations required. There is a specific requirement to perform one group of no less than 120 consecu
29、tive close-open operations during electrical endurance testing. This latest revision, IEEE Std C37.14-2002, again reestablishes the 1000 V maximum design rating, while also retaining the 1200 V rating, in order to recognize the recent development and use of 1000 V maximum design-rated circuit breake
30、rs. Corresponding changes have been made by NEMA to Tables 11 and 11A of ANSI C37.16-2000, which establishes the preferred ratings for LV power circuit breakers. Dielectric with- stand test voltages have also been relaxed for the 800 V and 1000 V maximum design ratings so as to differ- entiate from
31、the 1200 V rating. Some considerations that were addressed in the IEEE Std C37.14-1992 revision and retained in the 2002 revision are as follows: a)The need for lower rated circuit breakers for light-duty transit systems, which are generally 800 V catenary surface systems, was recognized. The power
32、requirements are approximately one-half those of a heavy-duty transit system, with the rectifier circuit breakers requiring maximum continu- ous current ratings of 4000 A and feeder circuit breakers with proportionately lower ratings. Tables 12 and 12A were replaced with a new Table 12 in ANSI C37.1
33、6-2000, which was revised to reflect a reduced base rating of 4000 kW in order to provide a lower level of design rated circuit breakers, which allows the use of designs different from those utilized for heavy-duty systems. b)The question of rectifier and feeder circuit breakers being rated identica
34、lly was previously addressed in the IEEE C37.14-1979 appendix, but this was now recognized and addressed in the body of the standard. Specific installation applications normally differentiate rating requirements between recti- fier and feeder breakers in the reverse/forward-current tripping modes, a
35、s well as in the short-time/ momentary rating modes. Therefore, it is important to recognize this difference in rating structures to provide for realistic design ratings and testing. c)The designs of high-speed and semi-high-speed circuit breakers with two different rating/test tables were conceptua
36、lly reviewed, and recognition of actual field application conditions forced a concept change. A given track system will produce given short-circuit currents and circuit stored energy at various locations regardless of circuit breaker type applied. Thus, there is a need for only two tablesone for low
37、 frequency, and one for high-frequency impedance bonds. Actually, the high- speed type circuit breaker is truly current-limiting by limiting let-through current to less than the available (prospective) peak in all cases. The semi-high-speed type is “semi-current-limiting,” limit- ing let-through cur
38、rent to less than the sustained current in all cases except in allowing the maximum peak current available to flow on low-inductance (close-in) faults. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User
39、=Japan, IHS Not for Resale, 07/30/2008 02:55:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ivCopyright 2003 IEEE. All rights reserved. Any dc circuit breaker must be capable of handling all short-circuit conditions based on the speed of opera- tion, current interrupted
40、, and circuit energy interrupted as verified by the short-circuit tests “a,” “b,” “c,” and “d” of Tables 11, 11A, and 12 in ANSI C37.16-2000. It is noted for comparison that ac low-voltage power circuit breakers are required by ANSI C37.50-1989 to be tested in four (4) sequences for certification/co
41、n- formance. Similar analysis of required testing resulted in the assignment of two (2) sequences in the 1992 standard. Depending on transformer/rectifier design impedance coupled with primary short-circuit current capacity and a low dc inductance, it may be possible to obtain a higher peak current
42、and/or sustained current under certain conditions. This design combination needs to be properly investigated and applied to prevent over- rating of all circuit breakers that cannot be rated higher than the rated peak and sustained currents listed in the preferred rating tables in ANSI C37.16-2000. T
43、his standard represents the standard practice in the United States for low-voltage dc circuit breakers. Molded-case circuit breakers are covered by other standards, but in some instances may be able to meet this standard. There is presently no specific IEC LV dc circuit breaker standard. IEC 60947-2
44、-1995 applies to circuit breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1000 Vac or 1500 Vdc, but is limited to breakers of 2500 A rated current and 50 kA short-circuit breaking capacity. Circuit breakers for traction applica
45、tions are not addressed. There is also an IEC Standard 60077-1-1968 (1968-01), which applies only to electrical equipment installed on motive power units. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, U
46、ser=Japan, IHS Not for Resale, 07/30/2008 02:55:21 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2003 IEEE. All rights reserved.v Participants The Accredited Standards Committee on Power Switchgear, C37, which reviewed and approved this stan- dard, had the follo
47、wing members at the time of approval: T. W. Olsen, Acting Chair A. K. McCabe, Vice Chair, HV Standards J. C. Scott, Vice Chair, LV Standards D. L. Swindler, Vice Chair, IEC Activities N. Ahmad, Co-Secretary J. Collins, Co-Secretary Organization RepresentedName of Representative Electric Light the ma
48、nufacturer should be consulted for functional components. Rectifier or feeder, semi- high-speed and high-speed dc circuit breakers frame size 1200 to 12 000 A Operating mechanism type ManualPower a) Direct-acting trip device(s) calibrated in accor- dance with ANSI C37.17-1997 Xb bAs required by the
49、application. Xb b) Overcurrent release (trip) in response to forward or reverse-current flow as necessary Xb c) Manual trip deviceXXX d) Contact position indicatorin accordance with 6.2 XXX e) Manually operated mechanism, trip-free with standard operating handle Xc cManually operated circuit breakers 3000 A and above shall be furnished with closing mechanism