1、IEEE Std 1776-2008IEEE Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and BelowIEEE3 Park Avenue New York, NY 10016-5997, USA13 February 2009 IEEE Power +1 978
2、750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. iv Copyright 2009 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std 1776-2008, IEEE Recommended Practice fo
3、r Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and Below. This recommended practice is intended to provide an evaluation of the thermal capability of an unsealed or sealed insulation
4、system. Other aging factors; electrical, mechanical, and environmental are also known to be important. Test procedures for evaluating those factors, both individually and in combination with each other, will be pursued by other working groups. Notice to users Laws and regulations Users of these docu
5、ments should consult all applicable laws and regulations. Compliance with the provisions of this standard does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory requirements. IEEE does
6、not, by the publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights This document is copyrighted by the IEEE. It is made available for a wide variety of both public and private uses. These in
7、clude both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making this document available for use and adoption by public authorities and private users, the IEEE does not waive any rights in co
8、pyright to this document. Updating of IEEE documents Users of IEEE standards should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of amendments, corrigenda, or errata. An official IEEE document at
9、any point in time consists of the current edition of the document together with any amendments, corrigenda, or errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of amendments, corrigenda, or errata, visit
10、 the IEEE Standards Association web site at http:/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.
11、v Copyright 2009 IEEE. All rights reserved. Errata Errata, if any, for this and all other 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 interpret
12、ations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html. Patents Attention is called to the possibility that implementation of this recommended practice may require use of subject matter covered by patent rights. By publication of this recommended practi
13、ce, no position is taken with respect to the 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 det
14、ermining whether 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 recommended practice are expressly advised that determination of the validity of any patent r
15、ights, 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 2009 IEEE. All rights reserved. Participants At the time this recommended practice was completed, this Working Group of the
16、Materials subcommittee of the Electric Machinery committee had the following membership: Chuck Wilson, Chair Nancy Frost, Secretary Dana Arndt Ray Bartnikas Kevin Becker Andrew Brown Weijen Chen Ian Culbert Paul Gaberson George Gao Bal K. Gupta Gary Heuston Richard Huber Jeff Hudson Aleksandra Jerem
17、ic Brandy LaBanca Lou Little David McKinnon Charles Millet Howard Penrose Lon Rux Meredith Stranges Ed Van Vooren Roger Wicks Joseph Williams Hugh Zhu The following members of the individual balloting committee voted on this recommended practice. Balloters may have voted for approval, disapproval, o
18、r abstention. Gabriele F. D. Alleva Anderson Paul Michael Bayer Thomas Bishop William Bloeth Andrew Brown Weijen Chen Roger Daugherty Matthew Davis John Densley Gary L. Donner Donald Dunn James Dymond Gary Engmann William Finley Rostyslaw Fostiak Carl Fredericks Nancy Frost Paul Gaberson J. Travis G
19、riffith Randall Groves Bal K. Gupta Gary Heuston Scott Hietpas Werner Hoelzl David Horvath Jeffrey Hudson Richard Hulett Innocent Kamwa Joeseph L. Koepfinger Brandy LaBanca Chung-Yiu Lam William Lockley Kevin Loving William McBride David McKinnon James Michalec Gary Michel G. Harold Miller Charles M
20、illet Glenn Mottershead Jerry Murphy Marcie Muzzey Paul Myers Arthur Neubauer Michael S. Newman Howard Penrose Christopher Petrola Alvaro Portillo Iulian Profir Madan Rana Gregory Stone Meredith Stranges S. Thamilarasan John Vergis Kenneth White Joseph Williams Chuck Wilson Hugh Zhu When the IEEE-SA
21、 Standards Board approved this recommended practice on 10 December 2008, it had the following membership: Robert M. Grow, Chair Thomas Prevost, Vice Chair Steve M. Mills, Past Chair Judith Gorman, Secretary Victor Berman Richard DeBlasio Andy Drozd Mark Epstein Alexander Gelman William Goldbach Arni
22、e Greenspan Ken Hanus Jim Hughes Richard Hulett Young Kyun Kim Joseph L. Koepfinger* John Kulick David J. Law Glenn Parsons Ron Petersen Chuck Powers Narayanan Ramachandran Jon Walter Rosdahl Anne-Marie Sahazizian Malcolm Thaden Howard Wolfman Don Wright vii Copyright 2009 IEEE. All rights reserved.
23、 *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal, NRC Representative Michael Janezic, NIST Representative Michelle Turner IEEE Standards Program Manager, Document Development Soo H. Kim IEEE Standards Program Manager, Technical Program
24、Development viii Copyright 2009 IEEE. All rights reserved. Contents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 2 1.3 General conditions. 2 1.4 Methods of evaluation . 2 2. Normative references 3 3. Definitions 3 4. Test models. 4 4.1 General 4 4.2 Construction of test models . 4 5. Text exposure . 8 5.
25、1 General 8 5.2 Temperature exposure . 8 5.3 Mechanical stress exposure . 10 5.4 Moisture exposure by humidification 10 5.5 Voltage exposure after humidification 11 5.6 Water immersion test (for sealed systems only) 12 5.7 Failure criteria 12 6. Procedures for reporting and analyzing results. 12 6.1
26、 Data . 12 6.2 Analysis . 13 6.3 Comparison 13 6.4 Extrapolation . 13 6.5 Nonlinear or dissimilar curves. 13 6.6 System identification . 13 Annex A (informative) Photos of various formette frames 14 Annex B (informative) Bibliography 15 1 Copyright 2009 IEEE. All rights reserved. IEEE Recommended Pr
27、actice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and Below IMPORTANT NOTICE: This standard is not intended to assure safety, security, health, or environmental protection in al
28、l circumstances. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requirements. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers a
29、ppear 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 from IEEE or viewed at http:/standards.ieee.org/IPR/ disclaimers.html 1. Overview 1.1 Scope
30、1 This recommended practice outlines test procedures for comparing two or more unsealed or sealed insulation systems in accordance with their expected life at rated temperature. The procedure is limited to insulation systems for AC electrical machines using form-wound pre-insulated stator coils rate
31、d 15 000 V and below. The intent of this test procedure is to evaluate unsealed insulation systems for use with air cooling under usual (normal) service conditions, or sealed insulation systems for use under severe environmental conditions (where the insulation is exposed to conducting contaminants)
32、. This procedure does not cover special requirements, such as those for machines enclosed in gas atmospheres or machines subjected to strong chemicals, metal dust or submersion in liquid, etc. The procedure includes instructions for testing candidate systems in comparison with known reference system
33、s, of the same type, having a proven record of service experience and interpreting the results of these tests. IEEE Std 1776-2008 IEEE Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Ma
34、chines Rated 15 000 V and Below 2 Copyright 2009 IEEE. All rights reserved. 1.2 Purpose The purpose of this procedure is to classify unsealed or sealed insulation systems for the machinery used in usual (normal) service or machinery used in severe environmental conditions (and falling within the sco
35、pe of this recommended practice) in accordance with their temperature capabilities by test, rather than by chemical composition. Data from such tests may be used to establish the temperature classification of new insulation systems before they are service-proven. In order to provide data from which
36、a base of reference for temperature classification can be established, service-proven (reference) unsealed or sealed systems should also be tested according to this test procedure. This document combines the procedures given in IEEE Std 275-1992 (for unsealed systems) with those of IEEE Std 429-1994
37、 (for sealed systems).11.3 General conditions The concepts implemented in this recommended practice are based on IEEE Std 99.2The intent of this procedure (Combination of IEEE Std 275-1992 and IEEE Std 429-1994) is to classify candidate insulation systems by comparing them to reference insulation sy
38、stems in machines with service-proven classifications in the Class A, B, F, H, N, S, R or C categories. The temperatures for classification of insulation systems are 105 C, 130 C, 155 C, 180 C, 200 C, 220 C, 240 C and over 240 C, respectively. It is expected that the several insulating materials or
39、components that form any insulation system to be evaluated by these procedures will first be screened by the appropriate test procedures for each type of material. Thermal indexes for insulating materials can be obtained by following the procedures shown in IEEE Std 98. Thermal indexes of insulating
40、 materials cannot be used to classify insulation systems. They are to be considered only as screening tests for this system test. 1.4 Methods of evaluation This test procedure describes test models suitable for use in insulation tests. The procedure recommends a series of heat exposures to which the
41、 test models may be subjected to represent, under accelerated conditions, the cumulative effects of long service. Procedures are given for applying periodic voltage checks, preceded by periods of mechanical stress and moisture, to establish the end point of insulation life by electric failure. To ob
42、tain an acceptable statistical average, for each chosen temperature of heat exposure, an adequate number of samples should be carried through the test procedure until failure occurs. It is recommended that the tests on the samples be performed at a minimum of three different aging (exposure) tempera
43、tures for each insulation system to be evaluated. 1IEEE Std 275-1992 and IEEE Std 429-1992 are withdrawn. 2Information on references can be found in Clause 2. IEEE Std 1776-2008 IEEE Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employ
44、ing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and Below 3 Copyright 2009 IEEE. All rights reserved. After the final results of the tests are known and the test life hours have been projected to a rated temperature, the ratio of the aging (exposure) hours of the candidate Elec
45、trical Insulation System (EIS) compared to the aging (exposure) hours of the reference EIS can provide a rough measure of the service life expectancy of the candidate system in relation to that of the reference system. Based on the current state of the art in terms of test procedures, no accurate pr
46、ediction of actual service life can be made from test results alone. This procedure will permit approximate comparisons only, and cannot be relied upon to completely determine the merits of any particular insulation system. Such information can be obtained only from the experience of extended servic
47、e. By following the general procedures outlined herein, the temperature classification in which any candidate insulation system belongs can be determined. 2. Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the
48、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. IEEE Std 98, IEEE Standard for the Preparation of Test Procedures for the Thermal Evaluation of Solid Electrical Insulating Materials (ANSI).3, 4IEEE Std 99
49、, IEEE Recommended Practice for the Preparation of Test Procedures for the Thermal Evaluation of Insulation Systems for Electric Equipment (ANSI). IEEE Std 101, IEEE Guide for the Statistical Analysis of Thermal Life Test Data. 3. Definitions For the purposes of this draft recommended practice, the following terms and definitions apply. The Authoritative Dictionary of IEEE Standards Terms B5should be referenced for terms not defined in this clause. 3.1 candidate insulation system: The proposed insulation system. 3.2 formette frame: The simulated metal sl
