IEC 60216-8-2013 Electrical insulating materials - Thermal endurance properties - Part 8 Instructions for calculating thermal endurance characteristics using si.pdf

1、 IEC 60216-8 Edition 1.0 2013-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials Thermal endurance properties Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures Matriaux isolants lectriques Proprits dendurance thermique Part

2、ie 8: Instructions pour le calcul des caractristiques dendurance thermique en utilisant des procdures simplifies IEC 60216-8:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reprod

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16、ette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60216-8 Edition 1.0 2013-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials Thermal endurance properties Part 8: Instructions for calculating thermal endurance characteristics using simplified p

17、rocedures Matriaux isolants lectriques Proprits dendurance thermique Partie 8: Instructions pour le calcul des caractristiques dendurance thermique en utilisant des procdures simplifies INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 17.220.99; 29.035.01 PR

18、ICE CODE CODE PRIX ISBN 978-2-83220-679-9 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vou

19、s avez obtenu cette publication via un distributeur agr. 2 60216-8 IEC:2013 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms, definitions, symbols and abbreviations 7 3.1 Terms and definitions 7 3.2 Symbols and abbreviations 8 4 Thermal endurance test procedure .

20、 9 4.1 General . 9 4.2 Number of test specimens . 9 4.3 Preparation of test specimens . 10 4.4 Preparation of ageing processes . 11 5 Simplified numerical and graphical evaluation procedures 12 5.1 Outline description of procedures 12 5.2 Simplified calculation procedures 13 5.2.1 Validity of simpli

21、fied calculations . 13 5.2.2 Times to end-point . 13 5.2.3 Calculation of the regression line . 14 5.2.4 Calculation of deviation from linearity 15 5.2.5 Temperature index and halving interval . 15 5.3 Data rescue . 16 5.4 Determination of RTI . 16 5.5 Test report 18 Bibliography 19 Figure 1 Determi

22、nation of the time to reach the end-point at each temperature Property variation (according to IEC 60216-1) . 14 Figure 2 Thermal endurance graph Temperature index Halving interval . 16 Figure 3 Thermal endurance graph Relative temperature index . 17 Table 1 Suggested exposure temperatures and times

23、 for TI corresponding to 20 000 h . 12 60216-8 IEC:2013 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATING MATERIALS THERMAL ENDURANCE PROPERTIES Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures FOREWORD 1) The International Electrot

24、echnical Commission (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

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33、 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 that some of the elements of this

34、 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 60216-8 has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. The

35、 text of this standard is based on the following documents: FDIS Report on voting 112/236/FDIS 112/244/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. This publication has been drafted in accordance with the ISO/

36、IEC Directives, Part 2. 4 60216-8 IEC:2013 A list of all parts in the IEC 60216 series, published under the general title Electrical insulating materials Thermal endurance properties, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchang

37、ed until the stability 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. 60216-8 IEC:2013 5 INTRODUCTION The designation thermal en

38、durance is used here to refer to the test of thermal stress in air, excluding any other influence or stress applied to the test specimens. Thermal endurance properties evaluated in different environments and/or with different stresses applied to the test specimens require different test procedures.

39、In this part of IEC 60216, the study of the thermal ageing of materials is based solely on the change in certain properties resulting from a period of exposure to elevated temperature. The properties studied are always measured after the temperature has returned to ambient. Properties of materials c

40、hange at various rates on thermal ageing. To enable comparisons to be made of the thermal ageing of different materials, the criteria for judgment depend on the type of property to be studied and its acceptable limiting value. 6 60216-8 IEC:2013 ELECTRICAL INSULATING MATERIALS THERMAL ENDURANCE PROP

41、ERTIES Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures 1 Scope This part of IEC 60216 specifies the general ageing conditions and simplified procedures to be used for deriving thermal endurance characteristics, which are shown by temperature index (

42、TI) and/or relative temperature index (RTI) and the halving interval (HIC). The procedures specify the principles for evaluating the thermal endurance properties of materials exposed to elevated temperature for long periods. In the application of this standard, it is assumed that a practically linea

43、r relationship exists between the logarithm of the time required to cause the predetermined property change and the reciprocal of the corresponding absolute temperature (Arrhenius relationship). For the valid application of the standard, no transition, in particular no first-order transition should

44、occur in the temperature range under study. Throughout the rest of this standard the designation “insulating materials“ is always taken to mean “insulating materials and simple combinations of such materials“. 2 Normative references The following documents, in whole or in part, are normatively refer

45、enced 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 60085, Electrical insulation Thermal evaluation and designation IEC 60

46、216-1:2013, Electrical insulating materials Thermal endurance properties Part 1: Ageing procedures and evaluation of test results 1IEC 60216-2, Electrical insulating materials - Thermal endurance properties - Part 2: Determination of thermal endurance properties of electrical insulating materials -

47、Choice of test criteria IEC 60216-3, Electrical insulating materials Thermal endurance properties Part 3: Instructions for calculating thermal endurance characteristics IEC 60216-4-1, Electrical insulating materials Thermal endurance properties Part 4-1: Ageing ovens Single-chamber ovens 1A sixth ed

48、ition is due to be published shortly. 60216-8 IEC:2013 7 IEC 60216-5, Electrical insulating materials Thermal endurance properties Part 5: Determination of relative thermal endurance index (RTE) of an insulating material ISO 291, Plastics Standard atmospheres for conditioning and testing 3 Terms, de

49、finitions, symbols and abbreviations For the purposes of this document, the following terms, definitions, symbols and abbreviations apply. 3.1 Terms and definitions 3.1.1 temperature index TI numerical value of the temperature in degrees Celsius derived from the thermal endurance relationship at a time of 20 000 h (or other specified time) 3.1.2 halving interval HIC numeri