《IEEE-429-1994.pdf》由会员分享，可在线阅读，更多相关《IEEE-429-1994.pdf（16页珍藏版）》请在三一文库上搜索。
1、 IEEE Std 429-1994 (Revision of IEEE Std 429-1972) IEEE Recommended Practice for Thermal Evaluation of Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Preinsulated Stator Coils for Machines Rated 6900 V and Below Sponsor Electric Machinery Committee of the IEEE Power Enginee
2、ring Society Approved September 24, 1994 IEEE Standards Board Approved April 17, 1995 American National Standards Institute Abstract: A test procedure for comparing two or more sealed insulation systems in accordance with their expected life at rated temperature is outlined. The procedure is limited
3、 to insulation systems for alternating- current (ac) electrical machines using form-wound preinsulated stator coils rated 6900 V and below. Keywords: ac electric machinery, insulation system, stator coils, thermal evaluation The Institute of Electrical and Electronics Engineers, Inc. 345 East 47 th
4、Street New York, NY 10017-2394, USA Copyright 1994 by The Institute of Electrical and Electronics Engineers Inc. All rights reserved. Published 1994. Printed in the United States of America ISBN 155937-455-1 No part of this publication may be reproduced in any form, in an electronic retrieval system
5、 or otherwise, without the prior written permission of the publisher IEEE Standards documents are developed within the Technical Committees of the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Board. Members of the committees serve voluntarily and without compensatio
6、n. They are not necessarily members of the Institute. The standards developed within IEEE represent a consensus of the broad expertise on the subject within the Institute as well as those activities outside of IEEE that have expressed an interest in participating in the development of the standard.
7、Use of an IEEE Standard is wholly voluntary. The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE Standard. Furthermore, the viewpoint expressed at the time a st
8、andard is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the standard. Every IEEE Standard is subjected to review at least every ve years for revision or reafrmation. When a document is more than ve years old an
9、d has not been reafrmed, it is reasonable to conclude that its contents, although still of some value, do not wholly reect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE Standard. Comments for revision of IEEE Standards are welco
10、me from any interested party, regardless of membership afliation with IEEE. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. Interpretations: Occasionally questions may arise regarding the meaning of portions of s
11、tandards as they relate to specic applications. When the need for interpretations is brought to the attention of IEEE, the Institute will initiate action to prepare appropriate responses. Since IEEE Standards represent a consensus of all concerned interests, it is important to ensure that any interp
12、retation has also received the concurrence of a balance of interests. For this reason IEEE and the members of its technical committees are not able to provide an instant response to interpretation requests except in those cases where the matter has previously received formal consideration. Comments
13、on standards and requests for interpretations should be addressed to: Secretary, IEEE Standards Board 445 Hoes Lane P.O. Box 1331 Piscataway, NJ 08855-1331 USA IEEE standards documents may involve the use of patented technology. Their approval by the Institute of Electrical and Electronics Engineers
14、 does not mean that using such technology for the purpose of conforming to such standards is authorized by the patent owner. It is the obligation of the user of such technology to obtain all necessary permissions. iii Introduction (This introduction is not part of IEEE Std 429-1994, IEEE Recommended
15、 Practice for Thermal Evaluation of Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 6900 V and Below.) The revision of this standard, originally issued in 1972, to an IEEE Recommended Practice brings it up to date with the curren
16、t IEEE policies and into conformance with the requirements of IEEE Std 99-1980 (Reaff 1992), IEEE Recommended Practice for the Preparation of Test Procedures for the Thermal Evaluation of Insulation Systems for Electric Equipment (which was revised to coordinate with international standards). This r
17、ecommended practice is intended to provide an evaluation of the thermal capability of a sealed insulation system. Other aging factorselectrical, mechanical, and environmentalare also known to be important. Test procedures for evaluating those factors, both individually and in combination with each o
18、ther, will be pursued by other working groups. Comments on, and suggestions for the improvement of, this standard are welcome, and should be sent to the IEEE Standards Board (see previous page). This standard was originally prepared by a Working Group of the Insulation Subcommittee (now the Material
19、s Subcommittee) of the Rotating Machinery Committee (now the Electric Machinery Committee) of the IEEE Power Engineering Society. This Working Group had the following membership: Walter G. Stiffler , Chair P. Alexander D. M. Bartos G. R. Betzhold R. Derber P. DiCerbo B. E. Ewers R. J. Flaherty M. Fr
20、omm G. Gibson W. Harvey P. Hernick A. Herreras L. M. Johnson J. Kuehlthau L. P. Mahon W. J. Martiny E. B. Mills W. Pendleton W. B. Penn R. Rhudy R. A. Roe V. R. Scardina R. M. Sexton H. P. Walker R. E. Weddel E. Yates R. H. Yerke L. E. Zenker The Working Group that submitted this revision had the fo
21、llowing membership: W. H. Gottung , Chair J. C. Botts L. F. Klataske W. B. Penn W. G. Stiffler J. J. Wilkes iv At the time that it balloted this standard for submission to the IEEE Standards Board, the Electric Machinery Committee of the IEEE Power Engineering Society had the following membership: R
22、. H. Auerbach R. G. Bartheld L. W. Buchanan G. W. Buckley A. W. Cameron C. C. Chan M. V. K. Chari J. L. Cohon N. A Demerdash J. S. Edmonds C. Flick N. K. Ghai B. E. B. Gott D. R. Green F. H. Grooms C. A. Gross B. Gupta H. Hamilton G. W. Herzog H. Hesse W. D. Jones H. E. Jordan J. L. Kirtley L. F. Kl
23、ataske S. B. Kuznetsov D. Lambrecht P. R. H. Landrieu T. A. Lipo T. J. Lorenz W. J. Martiny E. J. Michaels L. W. Montgomery S. A. Nasar T. W. Nehl N. E. Nilsson P. I. Nippes D. W. Novotny J. L. Oldenkamp J. A. Oliver M. Poloujadoff J. V. Pospisil M. A. Rahman C. M. Rowe S. J. Salon M. S. Sarma P. W.
24、 Sauer D. K. Sharma M. W. Sheets E. P. Smith J. F. Szablya P. J. Tsivitse P. Walker T. C. Wang R. F. Weddleton J. C. White J. J. Wilkes E. J. Woods When the IEEE Standards Board approved this standard on September 22, 1994, it had the following membership: Wallace S. Read , Chair Donald C. Loughry ,
25、 Vice Chair Andrew G. Salem , Secretary Gilles A. Baril Bruce B. Barrow Jos A. Berrios de la Paz Clyde R. Camp James Costantino Stephen L. Diamond Donald C. Fleckenstein Jay Forster * Ramiro Garcia Donald N. Heirman Richard J. Holleman Jim Isaak Ben C. Johnson Sonny Kasturi Lorraine C. Kevra E.G. Al
26、 Kiener Ivor N. Knight Joseph L. Koepfinger * D. N. Jim Logothetis L. Bruce McClung Marco W. Migliaro Mary Lou Padgett Arthur K. Reilly Ronald H. Reimer Gary S. Robinson Leonard L. Tripp * Member Emeritus Also included are the following nonvoting IEEE Standards Board liaisons: Satish K. Aggarwal Jam
27、es Beall Richard B. Engelman Robert E. Hebner David E. Soffrin Stephen J. Huffman| IEEE Standards Project Editor v CLAUSEPAGE 1. Overview1 1.1 Scope 1 1.2 Purpose. 1 1.3 General conditions . 2 1.4 Methods of evaluation 2 2. References.2 3. Test models.3 3.1 Scope 3 3.2 Models 3 4. Test exposure 4 4.
28、1 Scope 4 4.2 Temperature exposure 6 4.3 Mechanical stress exposure 7 4.4 Moisture exposure by humidification 7 4.5 Voltage exposure after humidification. 8 4.6 Moisture exposure by water immersion. 8 4.7 Voltage exposure during water immersion 9 4.8 Failure criteria 9 5. Procedure for reporting and
29、 analyzing9 5.1 Data 9 5.2 Analysis 9 5.3 Comparison 9 5.4 Extrapolation 9 5.5 Nonlinear or dissimilar curves. 10 5.6 System identification 10 IEEE Recommended Practice for Thermal Evaluation of Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Preinsulated Stator Coils for Ma
30、chines Rated 6900 V and Below 1. Overview 1.1 Scope This recommended practice outlines a test procedure for comparing two or more sealed insulation systems in accordance with their expected life at rated temperature. The procedure is limited to insulation systems for ac electrical machines using for
31、m-wound preinsulated stator coils rated 6900 V and below. The intent of this test procedure is to evaluate insulation systems for use with air cooling under severe environmental conditions, where the insulation is exposed to conducting contaminants. This procedure does not cover special requirements
32、, such as those for machines enclosed in gas atmospheres or machines subjected to strong chemicals or submersion in liquid, etc. The procedure includes instructions for testing candidate systems in comparison with known systems having a proven record of service experience and interpreting the result
33、s of these tests. 1.2 Purpose The purpose of this procedure is to classify sealed insulation systems for the machinery used in severe environmental conditions (and falling within the scope of this recommended practice) in accordance with their temperature capabilities by test, rather than by chemica
34、l composition. Data from such tests may be used to establish the temperature classication of new insulation systems before they are service-proven. In order to provide data from which a base of reference for temperature classication can be established, service- proven sealed systems should also be t
35、ested according to this test procedure. 2 Copyright 1998 IEEE All Rights Reserved IEEE Std 429-1994THERMAL EVALUATION OF SEALED INSULATION SYSTEMS FOR AC ELECTRIC 1.3 General conditions The concepts implemented in this recommended practice are based on IEEE Std 99-1980 . 1 The intent of this procedu
36、re is to classify insulation systems by comparing them to insulation systems in machines with service-proven classications in the Class A, B, F, or H categories. The temperatures for classication of insulation systems are 105 C, 130 C, 155 C, and 180 C, respectively. It is expected that the several
37、insulating materials or components that form any insulation system to, be evaluated by these procedures rst will be screened by the appropriate test procedures for each type of material. Thermal indexes for insulating materials can be obtained by following the procedures outlined in IEEE Std 98-1984
38、 . NOTE Thermal indexes of insulating 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 models suitable for use in insulation tests. The procedure recommends a serie
39、s of heat exposures to which the 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
40、 by electric failure. To obtain a good 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 test
41、temperatures for each insulation system to be evaluated. When nal results of the tests are reported, and the test life hours are projected to rated temperature, the ratio of such hours for a new insulation system to the test life hours for an old established insulation system provides a rough measur
42、e of the service life expectancy of the new system in relation to that of the old system. Based on the current state of the art in terms of test procedure, no accurate prediction of actual service life can be made from test results alone. This procedure will permit approximate comparisons only, and
43、cannot be relied upon to completely determine the merits of any particular insulation. Such information can be obtained only from the experience of extended service. By following the general procedures outlined above, the temperature classication in which any new insulation system belongs can be det
44、ermined. 2. References This recommended practice shall be used in conjunction with the following publications. IEEE Std 98-1984 (Reaff 1993), IEEE Standard for the Preparation of Test Procedures for the Thermal Evaluation of Solid Electrical Insulating Materials (ANS). 2 IEEE Std 99-1980 (Reaff 1992
45、), IEEE Recommended Practice for the Preparation of Test Procedures for the Thermal Evaluation of Insulation Systems for Electric Equipment (ANSI). IEEE Std 101-1987 (w1993), IEEE Guide for the Statistical Analysis of Thermal Life Test Data. 3 1 information on references can be found in clause 2 2 I
46、EEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855- 1331, USA. 3 IEEE Std 101-1987 has been withdrawn; however, copies can be obtained from the IEEE Standards Department, 445 Hoes Lane, P.O. Box 1331, Piscataw
47、ay, NJ 08855-1331, USA. Copyright 1998 IEEE All Rights Reserved 3 MACHINERY EMPLOYING FORM-WOUND PREINSULATED STATOR COILSIEEE Std 429-1994 IEEE Std 275-1992, IEEE Recommended Practice for Thermal Evaluation of Insulation Systems for Alternating- Current Electric Machinery Employing Form-Wound Prein
48、sulated Stator Coils for Machines Rated 6900 V and Below (ANSI). 3. Test models 3.1 Scope This clause makes general suggestions concerning appropriate samples of insulating systems that may be subject to the exposures outlined in clause 4. Size and convenience usually require that models, rather tha
49、n complete machines, be used for evaluation. Suitable models can be designed to adequately represent machines employing form-wound coils in the voltage class 6900 V and below. It is recognized that all machines covered by this range cannot be represented by any single model. 3.2 Models Models should be made to embody all the essential elements representing a complete winding system and its structural supports. The generic name formettes is applied to models coming within the scope of this procedure. Full and complete design information on th