1、 IEC 61857-1 Edition 3.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems Procedures for thermal evaluation Part 1: General requirements Low-voltage Systmes disolation lectrique Procdures dvaluation thermique Partie 1: Exigences gnrales Basse tension IEC 61857-1:2008
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16、ents ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61857-1 Edition 3.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulation systems Procedures for thermal evaluation Part 1: General requirements Low-voltage Systmes disolation lectrique Procd
17、ures dvaluation thermique Partie 1: Exigences gnrales Basse tension INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE P ICS 29.080.30 PRICE CODE CODE PRIX ISBN 2-8318-1003-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Co
18、mmission Electrotechnique Internationale 2 61857-1 IEC:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references6 3 Terms and definitions .6 4 General information 8 4.1 Overview of test procedure 8 4.2 Basis of evaluation and qualification 8 4.3 Specific requirements 8 5 Test objects9
19、 5.1 General .9 5.2 Description 9 5.3 Number of test objects.9 6 Test procedures9 6.1 General .9 6.2 Initial screening tests.9 6.3 Thermal ageing .10 6.4 Prediagnostic mechanical stress11 6.5 Other prediagnostic conditioning11 6.6 Moisture exposure .12 6.7 Dielectric diagnostic tests 12 6.8 Other di
20、agnostic tests12 7 Analyzing, reporting and classification.12 7.1 End-point criterion .12 7.2 Method of determining life13 7.3 Extrapolation of data13 7.4 Report of results14 Bibliography16 Figure 1 Arrhenius graph for comparing a candidate system C with a reference system R.15 Table 1 Suggested age
21、ing temperatures and ageing periods.10 Table 2 Thermal class assignment .13 61857-1 IEC:2008 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 1: General requirements Low-voltage FOREWORD 1) The International Electrotechnical Commissio
22、n (IEC) is a worldwide organization for standardization 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 ad
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31、e of the referenced publications is indispensable for 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
32、rights. International Standard IEC 61857-1 has been prepared by IEC technical committee 112: Evaluation and 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 sta
33、ndard compatible with Parts 21 and 22. The text of this standard is based on the following documents: CDV Report on voting 112/92/CDV 112/102/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. 4 61857-1 IEC:2008 Thi
34、s 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 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
35、this publication will remain unchanged until the maintenance 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. 61857-1 IEC:2
36、008 5 INTRODUCTION This International Standard establishes a standardized test procedure for estimating by comparison the life expectancy of electrical insulation systems (EIS) in accordance with IEC 60505. An EIS contains many different components selected to withstand the varying electrical, mecha
37、nical, and thermal stresses occurring in the different parts of the structure of an electrotechnical product. The useful life of an EIS depends upon the way that its individual components are arranged, their interactions upon each other, and the contribution of each component to the electrical and m
38、echanical integrity of the EIS. Therefore, it is impossible to specify one test object to represent all electrotechnical products. It is incumbent upon the IEC equipment technical committees to address the test objects and application of this test procedure that will meet their specific needs. This
39、work is intended to proceed by cooperation between this technical committee and other IEC technical committees to develop a series of parts, each part to address a specific test object and/or application. This procedure permits approximate comparisons only, and cannot be relied upon to completely de
40、termine the merits of any particular EIS. Such information can be obtained only from extended service experience. 6 61857-1 IEC:2008 ELECTRICAL INSULATION SYSTEMS PROCEDURES FOR THERMAL EVALUATION Part 1: General requirements Low voltage 1 Scope This part of IEC 61857 specifies a general test proced
41、ure for the thermal evaluation and qualification of electrical insulation systems (EIS) and establishes a procedure that compares the performance of a candidate EIS to that of a reference EIS. This standard is applicable to existing or proposed EIS used in electrotechnical products with an input vol
42、tage of up to 1 000 V where the thermal factor is the dominating ageing factor. 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 re
43、ferenced document (including any amendments) applies. IEC 60085:2004, Electrical insulation Thermal evaluation and designation IEC 60216-4-1, Electrical insulating materials Thermal endurance properties Part 4-1: Ageing ovens Single chamber ovens IEC 60216-5, Electrical insulating materials Thermal
44、endurance properties Part 5: Determination of relative thermal endurance index (RTE) of an insulating material IEC 60493-1, Guide for the statistical analysis of ageing test data Part 1: Methods based on mean values of normally distributed test results IEC 60505:2004, Evaluation and qualification of
45、 electrical insulation systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60505, as well as the following definitions, apply. 3.1 electrical insulation system EIS insulating structure containing one or more electrical insulating materials (EIM)
46、together with associated conducting parts employed in an electrotechnical device IEC 60505, definition 3.1.1 NOTE EIM with different temperature indices (ATE/RTE according to IEC 60216-5) may be combined to form an EIS which has a thermal class that may be higher or lower than that of any of the ind
47、ividual components according to IEC 60505. 3.2 candidate EIS EIS under evaluation to determine its service capability (thermal) 61857-1 IEC:2008 7 3.3 reference EIS established EIS evaluated on the basis of either a known service experience record or a known comparative functional evaluation 3.4 the
48、rmal class designation of an EIS that is equal to the numerical value of the maximum use temperature in degrees Celsius (C) for which the EIS is appropriate (see IEC 60085) NOTE The EIS may be subjected to operating temperatures exceeding its thermal class which can result in shorter expected life.
49、3.5 EIS assessed thermal endurance index EIS ATE numerical value of temperature in degrees Celsius for the reference EIS as derived from known service experience or a known comparative functional evaluation 3.6 EIS relative thermal endurance index EIS RTE numerical value of the temperature in degrees Celsius for the candidate EIS which is relative to the known EIS ATE of a
