1、IEEE Std C62.21-2003/Cor 1-2008(Corrigendum to IEEE Std C62.21-2003)IEEE Guide for the Application of Surge Voltage Protective Equipmenton AC Rotating Machinery 1000 V and Greater Corrigendum 1: Correct Table 2, A.1,and A.2IEEE3 Park Avenue New York, NY 10016-5997, USA26 November 2008IEEE Power +1 9
2、78 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Introduction This introduction is not part of IEEE Std C62.21-2003/Cor 1-2008, IEEE Guide for the Application of Surge Voltage Protectiv
3、e Equipment on AC Rotating Machinery 1000 V and GreaterCorrigendum 1: Correct Table 2, A.1, and A.2. This guide started with the publishing of an IEEE Transactions paper in 1981 by a Working Group of the Rotating Machinery Committee. That paper, “Impulse Voltage Strength of AC Rotating Machines,” ma
4、de a significant contribution to the ease of protecting electric utility rotating machines from surges. The paper indicated that ac machines could be expected to withstand surge fronts of 5 s with magnitude equal to the crest of the factory test voltage, and could withstand surge fronts as short as
5、200 ns with magnitude equal to two times crest line-to-ground rated voltage. At that time, ac machine manufacturers were usually recommending that large motors be surge protected on the grounds that protection was cheap and failure was costly. It was recognized that most of the knowledge was with th
6、e manufacturers, not the users. There was little measured data on the actual surge environment experienced by machines, nor was there measured data of actual withstand voltage or voltage to breakdown of machines in service. In addition, a survey of several thousand motors in industrial service showe
7、d that few were equipped with surge protection, and there was almost no evidence of failure due to absence of surge protection. A survey by WG3.4.9 of the Surge Protective Devices Committee found (from a small sample of utility installations) that surge protective capacitors were failing at about th
8、e same rate as those motor insulation failures that were not caused by overheating. It was also recognized that capacitor leads as usually installed, and even when of quite short lengths, have sufficient inductance to prevent the capacitor from protecting the machine from steep-front surges. Motor s
9、tarting surge fronts as short as 200 ns had been measured. At the instigation of an Edison Electric Institute committee and with electric utility support, the Electric Power Research Institute (EPRI) undertook a research program to investigate the surge environment being experienced by ac rotating m
10、achines, and machine surge withstand strength. The effort was directed to understand and be able to predict whether a particular machine was at risk. Both motors and generators were investigated. Particular attention was given to the problem of steep-front surges produced by full-voltage starting of
11、 motors (across-the-line). Much of the field and analytical work was contracted by EPRI to Ontario Hydro. By courtesy of EPRI and Ontario Hydro, and at their expense, IEEE Transactions papers were prepared to make the substance of their research generally available to the electric power industry and
12、 for preparation of IEEE guides. Concurrent with the EPRI/Ontario Hydro work, the National Electrical Manufacturers Association (NEMA), the International Electrotechnical Commission (IEC), and the IEEE have developed factory surge test standards for some ac machines. This corrigendum makes two corre
13、ctions to the keywords currently found in the frontmatter of IEEE Std C62.21-2003 by changing groundwall installation to groundwall insulation and changing turn installation to turn insulation. This corrigendum also corrects Table 2 found in 5.3.4 by correcting the K value for Y grounded primary to
14、Delta secondary connection; and by clarifying the ambiguity in Y ungrounded primary to Y grounded and Y ungrounded secondary connections. In A.1 of Annex A, errors in Equation (A.3) and Equation (A.6) are corrected. In A.2 of Annex A, errors and units in Equation (A.7), Equation (A.8), and Equation
15、(A.9) have been corrected; the example calculations for surge voltage magnitude and front duration at the motor terminal have been corrected; and the word as, where defined in the text as the attenuation factor for semi-conductive layer loss, has been corrected to the variable s. The corrections to
16、A.1 and A.2 in Annex A are detailed individually; afterwards, the changes are incorporated into what appears as a corrected version of these two clauses. iv Copyright 2008 IEEE. All rights reserved. Notice to users Laws and regulations Users of these documents should consult all applicable laws and
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22、ttp:/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:/standards.ieee.org. Errata Errata, if any, for this and all other
23、 standards can be accessed at the following URL: http:/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
24、/ index.html. Patents Attention is called to the possibility that implementation of this corrigendum may require use of subject matter covered by patent rights. By publication of this corrigendum, no position is taken with respect to the v Copyright 2008 IEEE. All rights reserved. vi Copyright 2008
25、IEEE. All rights reserved. existence or validity of any patent rights in connection therewith. 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 whether a
26、ny 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 corrigendum are expressly advised that determination of the validity of any patent rights, and the risk of infr
27、ingement of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association. Participants At the time this corrigendum was completed, the 3.4.9 Application Guide for Surge Voltage Protective Equipment on AC Rotating Machinery Working Group h
28、ad the following membership: David W. Jackson, Chair Dilip Biswas James J. Burke E. Peter Dick Dan Dunlap Thomas Field Ronald W. Hotchkiss E. W. Knapp Joseph L. Koepfinger Jody Levine Bert Parsons Russell A. Robbins Thomas J. Rozek Keith B. Stump Eva J. Tarasiewicz Edgar Taylor Ron Wellman Steve G.
29、Whisenant James Wilson The following members of the individual balloting committee voted on this corrigendum. Balloters may have voted for approval, disapproval, or abstention. William J. Ackerman Paul Anderson Steven Bezner Thomas Blackburn William Bloethe Steven Brockschink Kenneth Brown Gustavo B
30、runello William Bush William Byrd Robert Carruth James Case Michael Champagne Weijen Chen Michael Comber Tommy Cooper Jerry Corkran Matthew Davis Carlo Donati Donald Dunn James Dymond Gary Engmann Paul Forquer Carl Fredericks Waymon Goch Randall Groves Steve Hamilton Evans Heacock Steven Hensley Gar
31、y Heuston Raymond Hill Ronald W. Hotchkiss John Houdek David W. Jackson R. Jackson James Jones Joseph L. Koepfinger Jim Kulchisky Stephen Lambert Gerald Lee Dennis Lenk Jason Jy-Shung Lin Paul Lindemulder Albert Livshitz William Lockley Federico Lopez Jinxi Ma Keith N. Malmedal Omar Mazzoni Gary Mic
32、hel Georges Montillet Jerry Murphy Michael S. Newman Hans-Wolf Oertel Donald Parker Bansi Patel Shawn Patterson Christopher Petrola Alvaro Portillo Iulian Profir Johannes Rickmann Charles Rogers Thomas J. Rozek Bartien Sayogo Carl Schneider Tarkeshwar Singh Jerry Smith Raymond Strittmatter Keith B.
33、Stump Charles Sufana Edgar Taylor S. Telander James Thompson James Timperley Joe Uchiyama John Vergis James Wilson Larry Yonce Richard Young Contents Keywords2 5. Sources of surges .2 5.3 Remote origin surges .2 5.3.4 Surges transferred through local transformer .2 Annex A (normative) Formulas for c
34、alculators or personal computers 3 A.1 Surge Level, cables with no phase-to-phase coupling 3 A.2 Surge time constants .3 vii Copyright 2008 IEEE. All rights reserved. IEEE Guide for the Application of Surge Voltage Protective Equipment on AC Rotating Machinery 1000 V and Greater Corrigendum 1: Corre
35、ct Table 2, A.1, and A.2 IMPORTANT NOTICE: This standard is not intended to assure safety, security, health, or environmental protection in all circumstances. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory
36、requirements. 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 document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE
37、 Documents.” They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. NOTEThe editing instructions contained in this corrigendum define how to merge the material contained therein into the existing base standard and its amendments to form the compreh
38、ensive standard. The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace. Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change and describes what is being changed
39、 by using strikethrough (to remove old material) and underscore (to add new material). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replac
40、e is used to make changes in figures or equations by removing the existing figure or equation and replacing it with a new one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the changes will be incorporated into the base standard. 1 Copyrig
41、ht 2008 IEEE. All rights reserved. IEEE Std C62.21-2003/Cor 1-2008 Corrigendum 1: Correct Table 2, A.1, and A.2 Frontmatter Keywords Change the keywords groundwall installation and turn installation as follows: groundwall installation insulation, turn installation insulation 5. Sources of surges 5.3
42、 Remote origin surges 5.3.4 Surges transferred through local transformer Change Table 2 as follows: Table 2Single-phase surge magnetic coupling through 2-winding transformer B35 Primary connection Secondary connection K for (E2= N K E1) Y grounded Y grounded 1 Y grounded Y ungrounded 2/3 Y grounded
43、Delta Y ungrounded Y 2/3 Y ungrounded3/2Y grounded 2/3 Y ungrounded Y ungrounded 2/3 Y ungrounded Delta 13Delta Y grounded 13Delta Y ungrounded 13Delta Delta 2/3 2 Copyright 2008 IEEE. All rights reserved. IEEE Std C62.21-2003/Cor 1-2008 Corrigendum 1: Correct Table 2, A.1, and A.2 Annex A (normativ
44、e) Formulas for calculators or personal computers A.1 Surge Level, cables with no phase-to-phase coupling Replace the existing Equation (A.3) with the following equation that does not contain the square-root radical around the natural logarithm. rcrrZ=12ln x 60() (A.3) Change the first sentence in t
45、he paragraph following Equation (A.5) as follows: The external impedance of the shielded cable Zecan be calculated from Equation (A.4) using the radius of the shield for r1B22. Replace the existing Equation (A.6) with the following equation that does not contain an upper denominator (Rm+ Zc), and th
46、at corrects Rsto Rmin the first term of the lower denominator. ()()csecmmZRZZRV+=cmPZRV 2(A.6) A.2 Surge time constants Change the third sentence of the first paragraph as follows: The time constant sdue to metalclad switchgear bus and breaker inductance is: Replace the existing Equation (A.7) with
47、the following equation that contains the number 1000 in the numerator in front of the variable Ls, and that contains the unit for nanoseconds in parentheses to the right of the equation. csssZRL+=1000 (ns) (A.7) Replace the existing Equation (A.8) with the following equation that contains a rearrang
48、ed sequence of variables in the numerator, that contains the number 1000 in the denominator in front of the summation term so that the ratio Cm/1000 precedes the other variables, and that contains the unit for nanoseconds in parentheses to the right of the equation. 3 Copyright 2008 IEEE. All rights
49、 reserved. IEEE Std C62.21-2003/Cor 1-2008 Corrigendum 1: Correct Table 2, A.1, and A.2 ()cmcmmmZRZRC+=1000 (ns) (A.8) Replace the existing Equation (A.9) with the following equation that contains the variable L under the square-root radical and in front of the summation term, and that contains the unit for nanose
