1、 IEC 61857-21 Edition 3.0 2009-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems Procedures for thermal evaluation Part 21: Specific requirements for general-purpose models Wire-wound applications Systmes disolation lectrique Procdures dvaluation thermique Partie 21: Exige
2、nces particulires pour les modles dusage gnral Applications aux enroulements fil IEC 61857-21:2009 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
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16、es commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61857-21 Edition 3.0 2009-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems Procedures
17、 for thermal evaluation Part 21: Specific requirements for general-purpose models Wire-wound applications Systmes disolation lectrique Procdures dvaluation thermique Partie 21: Exigences particulires pour les modles dusage gnral Applications aux enroulements fil INTERNATIONAL ELECTROTECHNICAL COMMIS
18、SION COMMISSION ELECTROTECHNIQUE INTERNATIONALE P ICS 29.080.30 PRICE CODE CODE PRIX ISBN 2-8318-1041-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61857-21 IEC:2009 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6
19、 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 test12 6.3 The
20、rmal endurance test.13 6.3.1 Endurance test cycle13 6.3.2 Thermal ageing13 6.3.3 Mechanical stress13 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 1 Photos of GPM a
21、nd 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 61857-21 IEC:2009 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATION SYSTEMS PROCEDURES FO
22、R 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 committees (IEC National Committees). The ob
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31、, 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) Attention is drawn to the possibility t
32、hat 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 and qualification of electrical insu
33、lating 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 Report on voting 112/120/FDIS 112/
34、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. 4 61857-21 IEC:2009 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 61857 series, under
35、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 on the IEC web site under “http:/webstore.iec.ch“ in t
36、he data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61857-21 IEC:2009 5 INTRODUCTION A series of parts that will make up IEC 61857 is currently being developed, each of which will address a specific tes
37、t object and/or application with an associated test procedure. 6 61857-21 IEC:2009 ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 21: Specific requirements for general-purpose models Wire-wound applications 1 Scope This part of IEC 61857 describes a general-purpose model (GPM)
38、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 Normative references The following referenced documents are indispensable for the application
39、 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), Resin based reactive compounds used for electrical insulation IEC 60464: (all parts), Varnishes us
40、ed 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 requirements Low-voltage 3 Terms and definitions For the purposes of this document, the terms and d
41、efinitions 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 and a local earth IEV 195-01-08 3.2 earth (ground) insulation electrical insulating material (EI
42、M) 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 61857-21 IEC:2009 7 4 Construction 4.1 General information General-purpose models are useful in evaluating the compatibility of
43、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 such as winding techniques. Consequently, the influence of the manufacturing processes will be minimal. A GPM may
44、 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, thus representing the windings in the window of a transformer, or the windings in the slots of a motor or genera
45、tor, 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 additional height of the channel area in the GPM-TC allows for evaluation of three coils of winding wire and the extra p
46、air 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 formed of stainless steel plates in an appropriate manner and fixed to the base. One or more EIM and/or different
47、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 parallel (bifilar winding). The sets of windings should fill the channels. Each coil may be wound with a different type
48、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 the dielectric testing from coil-to-frame, coil-to-coil and conductor-to-conductor. Refer to Figure 2 for the pr
49、inciples of construction of the GPM and to Figure 3 for the principles of construction of the GPM-TC. IEC 665/09 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 porcelain or other appropriate material bolted to one end,
