IEC 61857-22-2008 Electrical insulation systems - Procedures for thermal evaluation - Part 22 Specific requirements for encapsulated-coil model - Wire-wound ele.pdf

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1、 IEC 61857-22 Edition 2.0 2008-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems Procedures for thermal evaluation Part 22: Specific requirements for encapsulated-coil model Wire-wound electrical insulation system (EIS) Systmes disolation lectriques Procdures dvaluation th

2、ermique Partie 22: Exigences particulires pour modle de bobine encapsule Systme disolation lectrique (SIE) enroulements fil IEC 61857-22:2008 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication m

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17、LE Electrical insulation systems Procedures for thermal evaluation Part 22: Specific requirements for encapsulated-coil model Wire-wound electrical insulation system (EIS) Systmes disolation lectriques Procdures dvaluation thermique Partie 22: Exigences particulires pour modle de bobine encapsule Sy

18、stme disolation lectrique (SIE) enroulements fil INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE M ICS 29.080.30 PRICE CODE CODE PRIX ISBN 2-8318-9945-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotec

19、hnique Internationale 2 61857-22 IEC:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 4 Construction.7 4.1 General information.7 4.2 ECM components 7 4.3 Assembly of the ECM 7 4.4 Similarity of reference and candidate ECM 8 5 Number of test objec

20、ts8 6 Test procedure .8 6.1 General .8 6.2 Initial screening test 8 6.2.1 General .8 6.2.2 Initial dielectric test .8 6.3 Thermal endurance test.9 6.3.1 Endurance test cycle .9 6.3.2 Thermal ageing .9 6.3.3 Mechanical stress10 6.3.4 Thermal shock.10 6.3.5 Moisture exposure.10 6.3.6 Dielectric diagno

21、stic test10 7 End-of-life criterion.11 8 Analysing, reporting and classification11 Annex A (informative) Similarity of reference and candidate specimens .12 Bibliography13 Table 1 Initial dielectric tests for ECM9 Table 2 Dielectric diagnostic tests for ECM10 61857-22 IEC:2008 3 INTERNATIONAL ELECTR

22、OTECHNICAL COMMISSION _ ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 22: Specific requirements for encapsulated-coil model Wire-wound electrical insulation system (EIS) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardiza

23、tion comprising all national electrotechnical committees (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 Internati

24、onal Standards, Technical Specifications, Technical Reports, 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

25、this preparatory work. International, governmental and 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

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29、l or regional publication shall be clearly indicated in 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

30、 this publication. 7) No liability shall attach to IEC 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

31、 indirect, or for costs (including legal fees) and expenses 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 f

32、or the correct application of this publication. 9) Attention 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 61857-22 has bee

33、n prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. This second edition cancels and replaces the first edition published in 2002, and constitutes editorial revisions to make this standard compatible with Parts 1 and 21. The text of

34、this standard is based on the following documents: CDV Report on voting 112/91/CDV 112/99/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directive

35、s, Part 2. 4 61857-22 IEC:2008 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 ma

36、intenance result date indicated 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. 61857-22 IEC:2008 5 INTRODUCTION A series of parts that will mak

37、e up IEC 61857 is currently being developed, each of which will address a specific test object and/or application with an associated test procedure. Additional parts will be developed in cooperation with IEC technical committees responsible for equipment. 6 61857-22 IEC:2008 ELECTRICAL INSULATION SY

38、STEMS PROCEDURES FOR THERMAL EVALUATION Part 22: Specific requirements for encapsulated-coil model Wire-wound electrical insulation system (EIS) 1 Scope This part of IEC 61857 provides a general-purpose procedure for the evaluation of wire- wound systems using a general purpose encapsulated-coil mod

39、el (ECM) where the application is unknown. 2 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 amen

40、dments) applies. IEC 61857-1:2004, 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 definitions given in IEC 61857-1, as well as the following definitions, apply. 3.1 enca

41、psulant electrical insulating material (EIM) that completely encases the coil except for connections to the exterior, and is part of the electrical insulation system (EIS) NOTE The encapsulated-coil model (ECM) does not employ a supplemental shell. 3.2 encapsulation process of applying an encapsulan

42、t NOTE For the purpose of evaluating an electrical insulation system (EIS), the process may consist of injection moulding, compression moulding, casting or other techniques. 3.3 bobbin form around which a coil is wound 3.4 coil continuous winding of insulated wire 3.5 coil-to-coil insulation electri

43、cal insulating material (EIM) between individual coils 61857-22 IEC:2008 7 3.6 earth ground (US) make an electric connection between a given point in a system or in an installation or in equipment and a local earth IEV 195-01-08 3.7 earth (ground) insulation electrical insulating material (EIM) betw

44、een a coil and earthed metal 4 Construction 4.1 General information The ECM is useful in evaluating the compatibility of EIM used in a candidate EIS. It is equally capable of simulating the influences of actual manufacturing processes such as winding techniques, termination techniques and encapsulat

45、ion. The essential parts of the ECM are a bobbin, winding wire, wire connectors and encapsulant. The winding wires may be connected to binding posts or to lead wires, either of which extends through the encapsulant wall. 4.2 ECM components The components of the encapsulated-coil model are as follows

46、: a) Coil: the coils may be wound with two wires in parallel (bifilar winding) or may be wound with a single wire. b) Wire: winding wire, heavy film coated; 0,4 mm to 0,6 mm diameter wire size is preferred. c) Earth insulation: the EIM used as the bobbin and the EIM used as the encapsulant function

47、as coil-to-earth insulation. An EIM evaluated only as a coil bobbin shall not also be used as an encapsulant material. An EIM used as an encapsulant shall be evaluated as such. d) Tape: electrical tape may be used but unless electrically stressed and evaluated is not part of the EIS. e) Connectors:

48、the winding wires are connected inside the encapsulant to binding posts or lead wires. These connections are essential parts of the ECM. f) Electrical impregnating resin/varnish: this may be part of the EIS if applied prior to the encapsulation process. NOTE A metal frame or a lamination stack that

49、may be incorporated into the test object is not an essential part of the test object if it does not function as a fault path. 4.3 Assembly of the ECM Assemble the ECM as follows: a) Wind the winding wire over the bobbin using accepted winding techniques. b) As appropriate, use electrical grade tape or other components to secure the winding wire in place. c) Connect