1、g3g3g3IEEE Guide for SwitchgearUnit SubstationRequirementsg3Sponsored by the Switchgear Committeeg3IEEE 3 Park Avenue New York, NY 10016-5997 USA 22 February 2013 IEEE Power and Energy SocietyIEEE Std C37.121-2012(Revision of IEEE Std C37.121-1989) IEEE Std C37.121-2012 (Revision of IEEE Std C37.121
2、-1989) IEEE Guide for SwitchgearUnit SubstationRequirements Sponsor Switchgear Committee of the IEEE Power and Energy Society Approved 5 December 2012 IEEE-SA Standards Board Approved 28 October 2014American National Standards InstituteAbstract: The basis for the coordination of equipment in unit su
3、bstations by assisting in the selection of components is intended as the use of this guide. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition sections. It is intended that the incoming, outg
4、oing, transformer, and transition sections included in a unit substation meet the basic requirements of applicable industry standards for those sections. This guide covers three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 3
5、8 kV. Keywords: control, dead-front switchboard, distribution, fuse, IEEE C37.121, metal-clad switchgear, metal-enclosed switchgear, metering, mobile unit substation, molded-case circuit breaker, motor control center, power circuit breaker, primary unit substation, radial substation, rectifier-type
6、substation, secondary selective substation, secondary unit substation, spot-network substation, substation, surge protection, switchgear, transformer, transition section, unit substation g120The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyr
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20、y of any patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association. vi Copyright 2013 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std C37.121-2012, IEEE G
21、uide for SwitchgearUnit SubstationRequirements. C37.121-1989 was originally developed by a working group sponsored by the Power Switchgear Assemblies Technical Committee of the Switchgear Section (8SG) of the National Electrical Manufacturers Association (NEMA/SG/5). The document was transferred fro
22、m NEMA to the IEEE Power and Energy Society Switchgear Committee, Switchgear Assemblies Subcommittee, in January of 2003. IEEE Std C37.121 was reaffirmed by the IEEE Standards Association Standards Board in 2006. The Switchgear Assemblies Subcommittee Task Force, created to review this document, det
23、ermined that this document did not meet the intent of a standard as it references applicable IEEE Standards for all requirements that must be met by each component of a Unit Substation. Based on this review, the Task Force recommended that this document be changed from a Standard to a Guide. The rec
24、ommendation was accepted by the Switchgear Assemblies Subcommittee. In the revision of this document from a standard to a guide, the document has been revised to reflect needed technical changes and to update the reference documents to the latest revisions. Other significant changes are as follows:
25、Subclauses 1.1 and 1.3 of IEEE Std C37.121-1989 have been combined to form the Scope and subclauses 1.2 and 1.4 have been combined to form the Purpose of the new document. Clause 2, Normative references, has been changed to remove dates and all informative standard references have been moved to Anne
26、x A. Clause 3, Definitions, has been arranged in alphabetical order. Table 1 has been redrawn and Table 2 through Table 5 have been combined into a new Table 2Primary unit substation transformers and Table 3Secondary unit substation transformers. Metal-enclosed bus as described in IEEE Std C37.23 ha
27、s been added to Clause 6Incoming section, Clause 7Outgoing section, 11.2Unusual service conditions, and 11.5.2Loading guides. All of the existing referenced figures in Clause 6, Clause 7, and Clause 10 have been redrawn, and moved into their respective sections. Figures that had previously shown a f
28、used and unfused figure have now been combined to show a figure with a fuse (when used) designation. Clause 8, Ratings, has been updated to reflect the latest rating names and definitions. vii Copyright 2013 IEEE. All rights reserved. Participants At the time this guide was submitted to the IEEE-SA
29、Standards Board for approval, the C37.121 Working Group had the following membership: James Smith, Chair Douglas Edwards, Vice-Chair P. Barnett Paul Barnhart J. Baskins Ted Burse L. Farr M. Flack Keith Flowers S. Gohil D. Hrncir A. Jivanani Harry Josten M. Lafond D. Lemmerman A. Livshitz D. Mazumdar
30、 S. Meiners A. Morgan Charles Morse Ted Olsen R. Parthasarathi A. Patel P. Sullivan C. Tailor J. Toney The following members of the individual balloting committee voted on this guide. Balloters may have voted for approval, disapproval, or abstention. William Ackerman Peter Balma Paul Barnhart Robert
31、 Beavers George Becker Steven Bezner Wallace Binder Ted Burse William Bush William Byrd Stephen Conrad Gary Donner Edgar Dullni Douglas Edwards Gary Engmann Patrick Fitzgerald Keith Flowers Frank Gerleve David Gilmer Mietek Glinkowski James Graham Randall Groves Timothy Hayden Jeffrey Helzer Gary He
32、uston Scott Hietpas Andrew Jones Harry Josten John Kay Chad Kennedy Yuri Khersonsky Joseph L. Koepfinger Jim Kulchisky Saumen Kundu Chung-Yiu Lam Albert Livshitz Frank Mayle Kenneth McClenahan Gary Michel Georges Montillet Charles Morse Jerry Murphy K. R. M. Nair Dennis Neitzel Arthur Neubauer Micha
33、el S. Newman Joe Nims Ted Olsen Lorraine Padden Mirko Palazzo Bansi Patel Christopher Petrola Iulian Profir Robert Puckett Reynaldo Ramos John Roach Michael Roberts Thomas Rozek Bartien Sayogo Gil Shultz Veselin Skendzic James Smith James Smith Jeremy Smith Jerry Smith Gary Stoedter James Swank Davi
34、d Tepen Wayne Timm Joe Uchiyama John Vergis Yingli Wen Kenneth White Larry Yonce Jian Yu viii Copyright 2013 IEEE. All rights reserved. When the IEEE-SA Standards Board approved this guide on 5 December 2012, it had the following membership: Richard H. Hulett, Chair John Kulick, Vice Chair Robert Gr
35、ow, Past Chair Konstantinos Karachalios, Secretary Satish Aggarwal Masayuki Ariyoshi Peter Balma William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Philippe Faure Alexander Gelman Paul Houz Jim Hughes Young Kyun Kim Joseph L. Koepfinger* David J. Law Thomas Lee Hung Ling Oleg Logvinov Ted Olsen
36、Gary Robinson Jon Walter Rosdahl Mike Seavey Yatin Trivedi Phil Winston Yu Yuan *Member EmeritusAlso included are the following nonvoting IEEE-SA Standards Board liaisons: Richard DeBlasio, DOE Representative Michael Janezic, NIST Representative Catherine Berger IEEE Standards Program Manager, Docum
37、ent Development Erin Spiewak IEEE Program Manager, Technical Program Development ix Copyright 2013 IEEE. All rights reserved. Contents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 2 2. Normative references 2 3. Definitions 4 4. Service conditions 5 4.1 General 5 4.2 Usual service conditions 5 4.3 Unusual
38、 service conditions 6 5. Transformer section 6 5.1 Primary unit substation transformers . 6 5.2 Secondary unit substation transformers . 7 6. Incoming section 7 6.1 High-voltage (or primary) bushings on the transformer cover 7 6.2 Primary terminal chamber on the transformer . 8 6.3 Metal-enclosed bu
39、s 8 6.4 Metal-clad or metal-enclosed switchgear 8 6.5 Metal-enclosed interrupter switchgear . 9 6.6 Cutout, fuse, or fuse link.10 7. Outgoing section 11 7.1 Metal-clad switchgear .11 7.2 Metal-enclosed interrupter switchgear 11 7.3 Metal-enclosed bus .11 7.4 Metal-enclosed, low-voltage, power circui
40、t breaker switchgear 11 7.5 Molded-case, circuit-breaker, dead-front switchboards 11 7.6 Motor control centers 12 8. Ratings .12 8.1 Rated power frequency .12 8.2 Rated kVA 12 8.3 Rated high voltage (or primary voltage) and rated low voltage (or secondary voltage) .12 8.4 Rated continuous current 12
41、 8.5 Rated short-time withstand current .12 8.6 Rated momentary withstand current .13 8.7 Rated power frequency withstand voltages 13 8.8 Rated lightning impulse withstand voltage (BIL) .13 9. Construction 13 9.1 Phase and polarity arrangements 13 9.2 Phase sequence .14 9.3 Metal barriers 14 9.4 Int
42、erlocks 14 9.5 Grounding .14 9.6 Nameplates .14 9.7 Drawings Diagrams Instructions 15 x Copyright 2013 IEEE. All rights reserved. 9.8 Coordination .15 10. Typical arrangements 16 10.1 Primary unit substations .16 10.2 Secondary unit substations .18 11. Guide for selection, application, installation
43、and maintenance of unit substations .22 11.1 Application considerations .22 11.2 Unusual service conditions .22 11.3 System conditions .22 11.4 Location transformer selection 23 11.5 Load requirements 23 11.6 Miscellaneous design considerations 24 11.7 Installation, field-testing, operation, and mai
44、ntenance .26 Annex A (informative) Bibliography 29 1 Copyright 2013 IEEE. All rights reserved. IEEE Guide for SwitchgearUnit SubstationRequirements IMPORTANT NOTICE: IEEE Standards documents are not intended to ensure safety, health, or environmental protection, or ensure against interference with o
45、r from other devices or networks. Implementers of IEEE Standards documents are responsible for determining and complying with all appropriate safety, security, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available f
46、or use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request fr
47、om IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. 1. Overview 1.1 Scope This guide covers three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 38 kV. This guide does not cover the following installations: a)
48、Substations in which the transformer section includes load-tap-changing equipment. b) Substations in which the transformer section is described and defined as “network,” “subway,” “vault,” or “underground” in IEEE Std C57.12.24 B14 and IEEE Std C57.12.40 B18. c) Substations in which the transformer
49、section is described and defined as “pad-mounted” in ANSI C57.12.22 and IEEE Std C57.12.27 B16. d) Gas-insulated substations as described in IEEE Std C37.122 B13. e) Rectifier-type substations. f) Mobile unit substations. g) Installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles. h) Installations for mines. IEEE Std C37.121-2012 IEEE Guide for SwitchgearUnit SubstationRequirements 2 Copyright 2013 IEEE. All rights reserved. i) Installations of railways for generation, transformatio
