1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Electrical insulation systems Procedures for thermal evaluation Part 21: Specific requirements for general-purpos
2、emodels Wire-wound applicationsBS EN 61857-21:2009National forewordThis British Standard is the UK implementation of EN 61857-21:2009. It isidentical to IEC 61857-21:2009. It supersedes BS EN 61857-21:2004 which iswithdrawn.The UK participation in its preparation was entrusted to Technical Committee
3、GEL/112, Evaluation and qualification of electrical insulating materials andsystems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its c
4、orrect application. BSI 2009 ISBN 978 0 580 62004 1 ICS 29.080.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 October 2009Amendments issued since publicatio
5、nAmd. No. Date Text affectedBRITISH STANDARDBS EN 61857-21:2009EUROPEAN STANDARD EN 61857-21 NORME EUROPENNE EUROPISCHE NORM July 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cent
6、ral Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61857-21:2009 E ICS 29.080.30 Supersedes EN 61857-21:2004English version Electrical insulation systems - Procedures for ther
7、mal evaluation - Part 21: Specific requirements for general-purpose models - Wire-wound applications (IEC 61857-21:2009) Systmes disolation lectrique - Procdures dvaluation thermique - Partie 21: Exigences particulires pour les modles dusage gnral - Applications aux enroulements fil (CEI 61857-21:20
8、09) Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung - Teil 21: Spezielle Bedingungen fr Mehrzweckmodelle - Anwendungen bei Drahtwicklungen (IEC 61857-21:2009) This European Standard was approved by CENELEC on 2009-06-01. CENELEC members are bound to comply with the CEN/CENELEC Inter
9、nal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC me
10、mber. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENEL
11、EC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
12、 Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61857-21:2009EN 61857-21:2009 - 2 - Foreword The text of document 112/120/FDIS, future edition 3 of IEC 61857-21, prepared by IEC TC 112, Evaluation and qualification of electrical insulating materials and systems, was submitted to
13、the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61857-21 on 2009-06-01. This European Standard supersedes EN 61857-21:2004. The editorial revisions make EN 61857-21:2009 compatible with Parts 1 and 22. The following dates were fixed: latest date by which the EN has to be implemented
14、at national level by publication of an identical national standard or by endorsement (dop) 2010-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Stand
15、ard IEC 61857-21:2009 was approved by CENELEC as a European Standard without any modification. _ BS EN 61857-21:2009- 3 - EN 61857-21:2009 Annex ZA(normative) Normative references to international publications with their corresponding European publications The following referenced documents are indi
16、spensable for the application of this document. 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 modified by common modifications, indicated
17、by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60455 Series Resin based reactive compounds used for electrical insulation EN 60455 Series IEC 60464 Series Varnishes used for electrical insulation EN 60464 Series IEC 60505 -1)Evaluation and qualification of electrical ins
18、ulation systems EN 60505 20042)IEC 61857-1 2008 Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage EN 61857-1 2009 1)Undated reference. 2)Valid edition at date of issue. BS EN 61857-21:2009 2 61857-21 IEC:2009 CONTENTS FOREWORD.3 INTRODUCTI
19、ON.5 1 Scope.6 2 Normative references6 3 Terms and definitions .6 4 Construction .7 4.1 General information .7 4.2 Model components 8 4.3 Assembly of the model.11 5 Number of test objects12 6 Test procedure .12 6.1 General .12 6.2 Initial screening test.12 6.2.1 General .12 6.2.2 Initial dielectric
20、test 12 6.3 Thermal endurance test .13 6.3.1 Endurance test cycle13 6.3.2 Thermal ageing13 6.3.3 Mechanical stress 13 6.3.4 Thermal shock.13 6.3.5 Moisture exposure .14 6.3.6 Dielectric diagnostic test 14 7 End-of-life criterion .14 8 Analysing, reporting and classification.15 Bibliography16 Figure
21、1 Photos of GPM and GPM-TC test objects7 Figure 2 Schematic drawing of a GPM frame .9 Figure 3 Manufacturing drawing of a GPM-TC frame.10 Table 1 Initial dielectric test13 Table 2 Dielectric diagnostic test 14 BS EN 61857-21:200961857-21 IEC:2009 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRI
22、CAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 21: Specific requirements for general-purpose models Wire-wound applications FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committe
23、es (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Re
24、ports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and
25、 non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreement
26、s of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and a
27、re accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote int
28、ernational uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
29、 the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC
30、or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expe
31、nses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Atte
32、ntion is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61857-21 has been prepared by IEC technical committee 112: Evaluation a
33、nd qualification of electrical insulating materials and systems. This third edition cancels and replaces the second edition published in 2004, and constitutes editorial revisions to make this standard compatible with Parts 1 and 22. The text of this standard is based on the following documents: FDIS
34、 Report on voting 112/120/FDIS 112/126/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. BS EN 61857-21:2009 4 61857-21 IEC:2009 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
35、A list of all the parts in the IEC 61857 series, under the general title Electrical insulation systems Procedures for thermal evaluation, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated
36、 on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 61857-21:200961857-21 IEC:2009 5 INTRODUCTION A series of parts that will make up IEC 618
37、57 is currently being developed, each of which will address a specific test object and/or application with an associated test procedure. BS EN 61857-21:2009 6 61857-21 IEC:2009 ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 21: Specific requirements for general-purpose models W
38、ire-wound applications 1 Scope This part of IEC 61857 describes a general-purpose model (GPM) and a tall channel alternative model (GPM-TC) which can be used for the evaluation of wire-wound electrical insulation systems (EIS) where specific electrotechnical products are not available or required. 2
39、 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60455 (all parts), Resi
40、n based reactive compounds used for electrical insulation IEC 60464: (all parts), Varnishes used for electrical insulation IEC 60505, Evaluation and qualification of electrical insulation systems IEC 61857-1, 2008, Electrical insulation systems Procedures for thermal evaluation Part 1: General requi
41、rements Low-voltage 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60505 and IEC 61857-1, as well as the following definitions, apply. 3.1 earth ground make an electric connection between a given point in a system, an installation or in equipment an
42、d a local earth IEV 195-01-08 3.2 earth (ground) insulation electrical insulating material (EIM) between a coil and earthed metal 3.3 coil continuous winding of insulated wire 3.4 coil-to-coil insulation electrical insulating material (EIM) between individual coils BS EN 61857-21:200961857-21 IEC:20
43、09 7 4 Construction 4.1 General information General-purpose models are useful in evaluating the compatibility of the electrical insulation materials (EIM) being used in a candidate electrical insulation system (EIS). A GPM is not capable of simulating the influence of actual manufacturing processes
44、such as winding techniques. Consequently, the influence of the manufacturing processes will be minimal. A GPM may be assembled by hand, using simple facilities. The essential components of general-purpose models are either two coils (GPM) or three coils (GPM-TC) mounted in the same pair of channels,
45、 thus representing the windings in the window of a transformer, or the windings in the slots of a motor or generator, and EIM placed between the pairing(s) of coils and the coil-to-frame location representing coil-to-coil insulation and earth insulation, respectively (see Figure 1). NOTE The additio
46、nal height of the channel area in the GPM-TC allows for evaluation of three coils of winding wire and the extra pair of stand-offs allows for electrical testing of the additional coil. Figure 1 GPM test object The channels, representative of the laminations in an electrotechnical product, shall be f
47、ormed of stainless steel plates in an appropriate manner and fixed to the base. One or more EIM and/or different thicknesses of EIM may be used as earth insulation in the construction. Two insulators for each coil shall be fixed to the base. The coils shall be wound with two winding wires in paralle
48、l (bifilar winding). The sets of windings should fill the channels. Each coil may be wound with a different type of winding wire and each type of winding wire shall be in contact with the earth insulation and coil-to-coil insulation. The coils shall be connected to the insulators so as to facilitate
49、 the dielectric testing from coil-to-frame, coil-to-coil and conductor-to-conductor. Refer to Figure 2 for the principles of construction of the GPM and to Figure 3 for the principles of construction of the GPM-TC. IEC 665/09 BS EN 61857-21:2009 8 61857-21 IEC:2009 4.2 Model components The components of the model are as follows: a) Frame: The frame consists of a rigid supporting metal base with suitable stand-off insulators of porcela
