ANSI IEEE C62.92.3-2012 Guide for the Application of Neutral Grounding in Electrical Utility Systems Part III-Generator Auxiliary Systems.pdf

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1、IEEE Guide for the Application of Neutral Grounding in Electrical Utility Systems, Part IIIGenerator Auxiliary Systems Sponsored by the Surge Protective Devices Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA 22 February 2013 IEEE Power and Energy Society IEEE Std C62.92.3-2012(Revision of

2、IEEE Std C62.92.3-1993) IEEE Std C62.92.3-2012 (Revision of IEEE Std C62.92.3-1993) IEEE Guide for the Application of Neutral Grounding in Electrical Utility Systems, Part IIIGenerator Auxiliary Systems Sponsor Surge Protective Devices Committee of the IEEE Power and Energy Society Approved 5 Decemb

3、er 2012 IEEE-SA Standards Board Approved 27 Ocotber 2014American National Standards InstituteAbstract: Basic factors and general considerations in selecting the class and means of neutral grounding for electrical generating plant auxiliary power systems are given in this guide. Apparatus to be used

4、to achieve the desired grounding are suggested, and methods to specify the grounding devices are given. Sensitivity and selectivity of equipment ground-fault protection as affected by selection of the neutral grounding device are discussed, with examples. Keywords: electrical generating plants, elec

5、trical utility systems, generator auxiliary systems, ground-fault protection, grounding, IEEE C62.92.3TM, neutral grounding xThe Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2013 by The Institute of Electrical and Electronics Engineers

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17、erved. v Essential Patent Claims may exist for which a Letter of Assurance has not been received. The IEEE is not responsible for identifying Essential Patent Claims for which a license may be required, for conducting inquiries into the legal validity or scope of Patents Claims, or determining wheth

18、er any licensing terms or conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are expressly advised that determination of the validity of any patent rights, and the risk of inf

19、ringement of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association. Copyright 2013 IEEE. All rights reserved. vi Participants At the time this IEEE guide was completed, the Neutral Grounding Working Group had the following membersh

20、ip: Steven G. Whisenant, Chair Michael Champagne, Vice Chair Mike Comber Thomas Field Randy Goodrich Steven Hensley Joseph L. Koepfinger Iuda Morar Don Parker Emanuel Petrache Rusty Robbins Thomas Rozek Keith Stump Eva Tarasiewicz Ed Taylor Rao Thallam Mike Valenza Arnie Vitols Reigh Walling James W

21、ilson Jon Woodworth The following members of the individual balloting committee voted on this guide. Balloters may have voted for approval, disapproval, or abstention. William Ackerman Michael Adams Ali Al Awazi Roger Avery Gustavo Brunello Carl Bush William Bush Mark Bushnell William Byrd Paul Card

22、inal Arvind K. Chaudhary Stephen Conrad Jerry Corkran Alireza Daneshpooy Matthew Davis Gary Donner Douglas Dorr Randall Dotson Donald Dunn Gary Engmann Rostyslaw Fostiak George Gela Frank Gerleve Kenneth Gettman Saurabh Ghosh David Gilmer Jalal Gohari Stephen Grier Randall Groves Ajit Gwal David Har

23、ris Jeffrey Helzer Steven Hensley Gary Heuston Robert Hoerauf Ronald Hotchkiss John Houdek Joseph Jancauskas Sheldon Kennedy Vladimir Khalin Yuri Khersonsky Chad Kiger Joseph L. Koepfinger Boris Kogan Jim Kulchisky Chung-Yiu Lam Benjamin Lanz Raluca Lascu Paul Lindemulder Thomas Lundquist Greg Luri

24、Jinxi Ma Michael Maytum Omar Mazzoni William McBride William McCown James Michalec Jeffery Mizener Jerry Murphy R. Murphy Ryan Musgrove Pratap Mysore Arthur Neubauer Michael S. Newman Nick S. A. Nikjoo Lorraine Padden Mirko Palazzo Sergio A. Panetta Bansi Patel Shawn Patterson Christopher Petrola Al

25、varo Portillo Iulian Profir Michael Roberts Charles Rogers Marnie Roussell Thomas Rozek Bartien Sayogo Robert Seitz Devki Sharma Soorya Shrestha Gil Shultz James Smith Jerry Smith Gary Stoedter Keith Stump Charles Sufana Robert Thornton-Jones Wayne Timm Demetrios Tziouvaras Joe Uchiyama Eric Udren G

26、erald Vaughn John Vergis John Wang Steven Whisenant Kenneth White James Wilson John Wilson Richard Young Jian Yu Kipp Yule Copyright 2013 IEEE. All rights reserved. vii When the IEEE-SA Standards Board approved this guide on 5 December 2012, it had the following membership: Richard H. Hulett, Chair

27、John Kulick, Vice Chair Robert M. Grow, 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* John Kulick David J. L

28、aw Thomas Lee Hung Ling Oleg Logvinov Ted Olsen Gary Robinson Jon Walter Rosdahl Mike Seavey Yatin Trivedi Phil Winston Yu Yuan *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Richard DeBlasio, DOE Representative Michael Janezic, NIST Representative Julie

29、 Alessi IEEE Standards Program Manager, Document Development Malia Zaman IEEE Standards Program Manager, Technical Program Development Copyright 2013 IEEE. All rights reserved. viii Introduction This introduction is not part of IEEE Std C62.92.3-2012, IEEE Guide for the Application of Neutral Ground

30、ing in Electrical Utility Systems, Part IIIGenerator Auxiliary Systems. This guide is a part of a series of standards on neutral grounding in electrical utility systems. When the series was first approved and published, it replaced IEEE Std 143-1954, IEEE Guide for Ground-Fault Neutralizers, Groundi

31、ng of Synchronous Generator Systems, and Neutral Grounding of Transmission Systems. In this series of documents, individual considerations and practices have been given to the grounding of synchronous generator systems, generator-station auxiliary systems, and distribution systems. IEEE Std 143-1954

32、 is a revision of AIEE No. 954, October 1954, which was a compilation of the following three AIEE Transaction papers: AIEE Committee Guide Report, “Application of Ground-Fault Neutralizers,” AIEE Transactions (Power Apparatus and Systems), vol. 72, pt. III, pp. 183-190, April 1953. AIEE Committee Re

33、port, “Application Guide for the Grounding of Synchronous Generator Systems,” AIEE Transactions (Power Apparatus and Systems), vol. 72, pt. III, pp. 517-530, June 1953. AIEE Committee Report, “Application Guide on Methods of Neutral Grounding of Transmission Systems,” AIEE Transactions (Power Appara

34、tus and Systems), vol. 72, pt. III, pp. 663-668, August, 1953. The contents of Part I through PartV of the revision of IEEE Std 143-1954 are based on the foregoing documents but are amplified and updated with new material from the IEEE tutorial course “Surge Protection in Power Systems” (79EH0144-6-

35、PWR) and other sources. In Part I through Part V of this series, emphasis is on power system grounding practices as contrasted with the grounding, for example, of industrial systems, which is covered in other guides and standards. These guides and standards should be referenced, when appropriate, to

36、 gain a full picture of other grounding practices. It is impossible to give recognition to all those who have contributed to the technology and practices of grounding of power systems, since work involving the preparation of this guide has been in progress for more than 30 years. However, the assist

37、ance of members, past and present, of the Neutral Grounding Devices Subcommittee of the Surge-Protective Devices Committee, and other similar groups with comparable purposes, should be acknowledged. Copyright 2013 IEEE. All rights reserved. ix Contents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 1 2. No

38、rmative references 2 3. Definitions 2 4. Introduction 3 4.1 Principal characteristics . 3 4.2 Past and present practice 3 5. Basic considerations . 4 5.1 Basic factors 4 5.2 Service continuity 5 5.3 Damage criterion . 5 5.4 Magnitude of overvoltages 7 5.5 Sensitivity and selectivity of ground-fault

39、relaying . 9 5.6 Magnitude of ground-fault current .11 5.7 Emergency, standby, vital, and safety-related ac and dc systems .11 6. Grounding classes usually applied.12 6.1 Ungrounded 12 6.2 Resistance grounding 13 6.3 Effective grounding (solid or direct) 13 6.4 Grounding dc control systems 13 7. Sel

40、ecting the grounding device 14 7.1 Groundinggeneral .14 7.2 Selection of a neutral grounding resistor 14 Annex A (normative) Ground-fault protection .19 A.1 Automatic or manual .19 A.2 Low-resistance grounded systems .19 A.3 Ungrounded and high-resistance grounded systems 20 Annex B (normative) Grou

41、nd-fault location 21 B.1 General .21 B.2 Automatic ground-fault location 21 B.3 Manual ground-fault location .21 Annex C (informative) Bibliography23 Copyright 2013 IEEE. All rights reserved. 1 IEEE Guide for the Application of Neutral Grounding in Electrical Utility Systems, Part IIIGenerator Auxil

42、iary Systems IMPORTANT NOTICE: IEEE Standards documents are not intended to ensure safety, health, or environmental protection, or ensure against interference with or from other devices or networks. Implementers of IEEE Standards documents are responsible for determining and complying with all appro

43、priate safety, security, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this doc

44、ument and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. 1. Overview 1.1 Scope The scope of this project is to summarize the

45、 general considerations in grounding of generating station auxiliary power systems, the factors to be considered in selecting between the appropriate grounding classes, and specifying equipment ratings. This guide applies to both medium-voltage (1 kV-15 kV) and low-voltage (less than 1 kV) auxiliary

46、 power systems. The intent of this guide is to discuss grounding methods which may be used to limit equipment damage. The emphasis is on reliability and availability of auxiliary power system service, achieved through control of ground-fault currents and transient overvoltages. 1.2 Purpose The purpo

47、se of this guide is to present some basic considerations for the selection of neutral grounding parameters that will provide for the control of ground-fault currents and overvoltage on auxiliary systems of electrical utility three-phase generators. The purpose of this revision is to update 5.3 with

48、current IEEE Std C62.92.3-2012 IEEE Guide for the Application of Neutral Grounding in Electrical Utility Systems, Part III-Generator Auxiliary Systems Copyright 2013 IEEE. All rights reserved. 2 research on equipment damage, update all references, and to ensure no intrusion or overlap with IEEE Std

49、1584.1,22. Normative references The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. IEEE Std 142, IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems (IEEE Gr