BS EN 60034-18-34-2012 Rotating electrical machines Functional evaluation of insulation systems Test procedures for form-wound windings Evaluation of thermomechanical endurance of .pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRotating electrical machinesPart 18-34: Functional evaluation of insulation systems Test procedures for form-wound windings Evaluation of thermomechanical endurance of insulation

2、 systemsBS EN 60034-18-34:2012National forewordThis British Standard is the UK implementation of EN 60034-18-34:2012. It is identical to IEC 60034-18-34:2012. It supersedes DD CLC/TS 60034-18-34:2004 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/

3、2, Rotating electrical machinery.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institu

4、tion 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 65654 5 ICS 29.080.30; 29.160.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2012.Am

5、endments issued since publicationDate Text affectedBRITISH STANDARDBS EN 60034-18-34:2012EUROPEAN STANDARD EN 60034-18-34 NORME EUROPENNE EUROPISCHE NORM July 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr E

6、lektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60034-18-34:2012 E ICS 29.160 Supersedes CLC/TS 60034-18-34:2004English version Rotating electric

7、al machines - Part 18-34: Functional evaluation of insulation systems - Test procedures for form-wound windings - Evaluation of thermomechanical endurance of insulation systems (IEC 60034-18-34:2012) Machines lectriques tournantes - Partie 18-34: Evaluation fonctionnelle des systmes disolation - Pro

8、cdures dessai pour enroulement prforms - Evaluation de lendurance thermomcanique des systmes disolation (CEI 60034-18-34:2012) Drehende elektrische Maschinen - Teil 18-34: Funktionelle Bewertung von Isoliersystemen - Prfverfahren fr Wicklungen mit vorgeformten Elementen - Thermomechanische Bewertung

9、 von Isoliersystemen (IEC 60034-18-34:2012) This European Standard was approved by CENELEC on 2012-07-19. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alter

10、ation. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language

11、made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czec

12、h Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kin

13、gdom. BS EN 60034-18-34:2012EN 60034-18-34:2012 - 2 - Foreword The text of document 2/1660/FDIS, future edition 1 of IEC 60034-18-34, prepared by IEC/TC 2 “Rotating machinery“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60034-18-34:2012. The following dates are fixed

14、: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-04-19 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-07-19 This document supersedes CLC

15、/TS 60034-18-34:2004. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60

16、034-18-34:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60034-18-34:2012- 3 - EN 60034-18-34:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part,

17、 are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modi

18、fied by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60028 1925 International standard of resistance for copper - - IEC 60034-1 (mod) 2010 Rotating electrical machines - Part 1: Rating and performance EN 60034-1 + corr. October 2010 2010

19、 IEC 60034-15 - Rotating electrical machines - Part 15: Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines EN 60034-15 - IEC 60034-18-1 - Rotating electrical machines - Part 18-1: Functional evaluation of insulation systems - General guidelines EN 60034-18-1 - IEC

20、 60034-18-32 2010 Rotating electrical machines - Part 18-32: Functional evaluation of insulation systems - Test procedures for form-wound windings - Evaluation of electrical endurance EN 60034-18-32 2010 IEC/TS 60034-27 2006 Rotating electrical machines - Part 27: Off-line partial discharge measurem

21、ents on the stator winding insulation of rotating electrical machines CLC/TS 60034-27 2011 IEC 60093 1980 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials HD 429 S11) 1983 IEC/TR 60894 + corr. July 1987 1987 Guide for a test procedure for the me

22、asurement of loss tangent of coils and bars for machine windings - - 1) HD 429 S1 is superseded by EN 62631-1:2011, which is based on IEC 62631-1:2011. BS EN 60034-18-34:2012 2 60034-18-34 IEC:2012 CONTENTS INTRODUCTION . 5 1 Scope . 6 2 Normative references 6 3 General considerations . 6 3.1 Relati

23、onship to IEC 60034-18-1 . 6 3.2 Thermomechanical ageing process 7 3.3 Designation of test procedure 7 3.4 Reference insulation system 7 4 Test specimens and test objects . 7 4.1 Construction 7 4.2 Number of test specimens . 8 5 Heating and cooling cycles 8 5.1 Temperature and length of heating and

24、cooling cycles . 8 5.2 Number of cycles . 10 6 Test procedure 1 for bars/coils in model slots . 10 6.1 Model slot 10 6.2 Support for end parts of test objects 11 6.3 Methods of heating 11 6.4 Methods of cooling 12 7 Test procedure 2 for unrestrained bars/coils 12 7.1 Positioning the bars/coils for t

25、est . 12 7.2 Method of heating 12 7.3 Methods of cooling 13 8 Tests for qualification 13 8.1 Initial quality control tests. 13 8.2 Suggested diagnostic tests on individual bars/coils 13 8.3 Recommended frequency of diagnostic tests 14 8.4 Criterion for qualification 14 9 Analysis and reporting 15 Fi

26、gure 1 Details of stator bar and coil definitions . 8 Figure 2 Heating and cooling cycle schedule. 10 Figure 3 Example of the model slot with two bars 11 BS EN 60034-18-34:201260034-18-34 IEC:2012 5 INTRODUCTION IEC 60034-18-1 presents general guidelines for the evaluation and classification of insu

27、lation systems used in rotating electrical machines. This part deals with the evaluation of insulation systems for form-wound windings under thermal cycling operation. This kind of endurance is of special importance for long rotating machines (especially indirectly cooled) and machines that are expo

28、sed to a very large number of considerable load changes during normal operation. The main ageing factor expected in this test procedure is a mechanical stress due to the thermal expansion difference between the conductor and the insulation, which is defined as a thermomechanical stress. In this test

29、, a transient temperature gradient from the conductor to the outer surface of the bar or coil is generated with similar time constant as those found in real generators. This thermal cycle is repeated to induce fatigue in the insulation system. In this test, the thermal ageing is negligible. For ther

30、mal functional test, see IEC 60034-18-31. BS EN 60034-18-34:2012 6 60034-18-34 IEC:2012 ROTATING ELECTRICAL MACHINES Part 18-34: Functional evaluation of insulation systems Test procedures for form-wound windings Evaluation of thermomechanical endurance of insulation systems 1 Scope This part of IEC

31、 60034 gives test procedures for the evaluation of thermomechanical endurance of insulation systems of form-wound windings. In this evaluation, the performance of a candidate system is compared to that of a reference insulation system with proven service experience. 2 Normative references The follow

32、ing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60028:1925, I

33、nternational standard of resistance for copper IEC 60034-1:2010, Rotating electrical machines Part 1: Rating and performance IEC 60034-15, Rotating electrical machines Part 15: Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines IEC 60034-18-1, Rotating electrical

34、machines Part 18-1: Functional evaluation of insulation systems General guidelines IEC 60034-18-32:2010, Rotating electrical machines Part 18-32: Functional evaluation of insulation systems Test procedures for form-wound windings Evaluation by electrical endurance IEC/TS 60034-27:2006, Rotating elec

35、trical machines Part 27: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machines IEC 60093:1980, Method of test for volume resistivity and surface resistivity of solid electrical insulating materials IEC/TR 60894:1987, Guide for a test procedure for t

36、he measurement of loss tangent of coils and bars for machine windings 3 General considerations 3.1 Relationship to IEC 60034-18-1 The principles of IEC 60034-18-1 should be followed, unless the recommendations of this part indicate otherwise. BS EN 60034-18-34:201260034-18-34 IEC:2012 7 3.2 Thermome

37、chanical ageing process As a result of thermomechanical cycling, the following mechanical degradations can occur in the insulation system of the windings: a) delamination between layers of the insulation; b) delamination between a layer of the insulation and the conductor; c) abrasion at the outer s

38、urface of the insulation; d) circumferential cracking of the insulation (tape separation/girth cracking), most likely in the extension of the straight part; e) mechanical damage to the insulation caused by distortion of the end turns of the winding. 3.3 Designation of test procedure Depending upon w

39、hich ageing processes are to be simulated, two test procedures will be described. Test procedure 1, in which the test bars/coils of the winding are assembled in model slots simulating the conditions in an actual machine, including the supports at both ends of the bars/coils. Test procedure 2, in whi

40、ch the bars/coils are free to move, without the restraints caused by the presence of model slots and end supports. Test procedure 1 can be used to simulate all the ageing processes listed in 3.2. This is the most informative method for assessing thermomechanical endurance performance because it simu

41、lates more precisely the conditions occurring in the windings of machines in service. Test procedure 2 can be used to simulate ageing process 3.2 a) and 3.2 b), namely when the winding design allows for free axial movement of the bars/coils in the slots. In both test procedures, the test objects are

42、 initially exposed to quality control tests and optional diagnostic tests. At certain prescribed times during and at the end of the thermal cycling, the diagnostic tests may be repeated. The ultimate final functional test is a destructive test. 3.4 Reference insulation system A reference insulation

43、system shall be tested using the same test procedure as for the candidate system. An insulation system qualifies to be used as a reference insulation system, if it has shown successful operation over suitably long periods of time at typical operating conditions for that insulation system. The class

44、temperature of the reference insulation system shall not differ from that of the candidate insulation system by more than one thermal class. If experience with a suitable reference system is not available, maximum permissible changes of the properties of the insulation system caused by the thermomec

45、hanical endurance test shall be specified, in some cases after an agreement between manufacturer and user. 4 Test specimens and test objects 4.1 Construction The test specimen shall be an actual bar or coil (see Figure 1) for a rotating machine. The test specimen shall have the same shape and the sa

46、me length as the bar/coil that could be used in an actual machine. It shall be manufactured by applying the insulation system to a conductor with the same design and materials and using the same procedure as an actual bar/coil. The conductor cross-section, insulation thickness, creeping distances an

47、d corona suppression shall be similar to those of an actual bar/coil of the maximum rated voltage to be tested. BS EN 60034-18-34:2012 8 60034-18-34 IEC:2012 In test procedure 1, the test object comprises a number of test specimens (see 4.2) assembled in model slots and supported as in a real machin

48、e. The bars or coils shall be fully cured as in the functional machine. Length of bar straight part Slot length Extension Bar end part IEC 1006/12 Figure 1a Stator bar Length of coil straight part Slot length Extension Coil end part IEC 1007/12 Figure 1b Stator coil Figure 1 Details of stator bar an

49、d coil definitions 4.2 Number of test specimens At least five bars or three coils shall be tested in each thermomechanical test. Additional coils/bars should be necessary to monitor the conductor temperature and to perform destructive tests on reference (non-cycled) set of bars/coils (see 5.1, 6.3 and 7.2). If the temperature is determined from the copper resistance variation, these additional coils/bars may not be needed. 5 Heating and cooling cycles 5.1 Temperature and length of heating