BS PD IEC TS 60216-7-1-2015 Electrical insulation materials Thermal endurance properties Accelerated determination of relative thermal endurance using analytical test methods (RTEAi.pdf

1、BSI Standards PublicationElectrical insulation materials Thermal endurance propertiesPart 71: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) Instructions for calculations based on activation energyPD IEC/TS 60216-7-1:2015National forewordThis Published D

2、ocument is the UK implementation ofIEC/TS 60216-7-1:2015.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/112, Evaluation and qualification of electrical insulatingmaterials and systems.A list of organizations represented on this committee can be obtained onrequest to

3、its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84730 1ICS 19.020; 29.020; 29.035.01Compliance with a

4、British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 30 April 2015.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD IEC/TS 60216-7-1:2015IEC TS 6021

5、6-7-1 Edition 1.0 2015-03 TECHNICALSPECIFICATION Electrical insulation materials Thermal endurance properties Part 7-1: Accelerated determination of relative thermal endurance usinganalytical test methods (RTEA) Instructions for calculations based onactivation energy INTERNATIONALELECTROTECHNICALCOM

6、MISSION ICS 19.020; 29.020; 29.035.01 ISBN 978-2-8322-2430-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC TS 60216-7-1:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2

7、 Normative references. 6 3 Terms, definitions and abbreviations 7 3.1 Terms and definitions 7 3.2 Abbreviations 9 4 General considerations 9 4.1 Thermal degradation kinetics . 9 4.2 Thermal analysis . 10 4.3 Thermal endurance . 10 5 General basics 11 5.1 Reaction rate, r . 11 5.2 Extent of reaction

8、12 5.3 Rate of conversion 12 5.4 Order of reaction, n . 12 5.5 Rate law . 13 6 Thermokinetic parameter estimation . 13 7 Analytical test methods 16 7.1 General . 16 7.2 Isothermal methods . 16 7.3 Model-free methods 16 7.4 Model-fitting methods 17 7.5 Conventional reference point . 17 8 Calculation

9、procedures 17 8.1 Determination of the kinetic parameters . 17 8.2 Determination of analytical temperature endurance index, RTEA, and halving interval, HICA. 17 8.3 Determination of RTEA17 General . 17 8.3.1Calculation . 18 8.3.29 Test report. 19 Bibliography . 21 Figure 1 Thermal endurance graph fo

10、r the determination of the relative temperature endurance (RTE) 18 PD IEC/TS 60216-7-1:2015IEC TS 60216-7-1:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATION MATERIALS THERMAL ENDURANCE PROPERTIES Part 7-1: Accelerated determination of relative thermal endurance using

11、 analytical test methods (RTEA) Instructions for calculations based on activation energy FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is

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19、n of 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 direc

20、t or 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 indispensab

21、le 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 rights. The main task of IEC technical committe

22、es is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still unde

23、r technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standar

24、ds. IEC TS 60216-7-1, which is a technical specification, has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulation materials and systems. PD IEC/TS 60216-7-1:2015 4 IEC TS 60216-7-1:2015 IEC 2015 The text of this technical specification is based on the

25、following documents: Enquiry draft Report on voting 112/298/DTS 112/314/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives,

26、Part 2. 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 unchanged until the stability date indicat

27、ed 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 transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be is

28、sued at a later date. PD IEC/TS 60216-7-1:2015IEC TS 60216-7-1:2015 IEC 2015 5 INTRODUCTION The existing procedures of the IEC 60216 series for the evaluation of thermal endurance of an electrical insulation material can be time consuming. These methods are therefore of limited use during developmen

29、t of new materials or screening of existing products for use as a material in an electrical insulation. There is an important demand from industry for a rapid test method of relative thermal endurance (RTE) / temperature index (TI) and halving interval (HIC) to reduce project times and cost. A short

30、-term test procedure for conventional thermal endurance characterization is proposed in IEC 60216-5 and a simplified approach to data processing is described in IEC 60216-8. Non-conventional methodology for thermal endurance characterization which can reduce further test times is considered in this

31、technical specification. The basic procedure is based on thermal analysis methods (DSC and TGA in particular, but not restricted to them) to evaluate the activation energy of the thermal degradation of the material. The activation energy is directly correlated with the HIC of the thermal endurance.

32、With this information, a single-point thermal endurance test, according to IEC 60216-1 and IEC 60216-5, at the highest temperature of those selected for the conventional thermal ageing procedure, is sufficient to calculate the temperature corresponding to a selected life, typically 20 000 h, i.e. an

33、 estimate of TI. However, due to the inherent uncertainty associated with this analytical approach, only RTE can be provided for material characterization. This is obtained performing the single-point thermal endurance test in the same conditions of temperature and environment as a reference materia

34、l of known thermal endurance characteristics, i.e. TI and HIC. The analytical test methods described in this technical specification may satisfy the demand of shortening the insulating material characterization procedure, if used with care and considering the restrictions these methods imply. At pre

35、sent, the universal applicability and the accuracy of these methods is not validated, thus a round robin test is required to provide an IEC standard based on these procedures. This part of IEC 60216 is therefore published as a technical specification. A general assessment process of the procedures w

36、ill be developed in other sub-parts of IEC 60216-7. PD IEC/TS 60216-7-1:2015 6 IEC TS 60216-7-1:2015 IEC 2015 ELECTRICAL INSULATION MATERIALS THERMAL ENDURANCE PROPERTIES Part 7-1: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) Instructions for calculati

37、ons based on activation energy 1 Scope This technical specification describes the procedure for the evaluation of the thermal endurance of electrical insulating materials, based on thermal analysis methods for the evaluation of the activation energy of the thermal degradation reaction and a conventi

38、onal life test providing a life point in the thermal endurance graph. The purpose of the test procedure is to estimate the relative temperature index (RTE). Predictions of thermal endurance based on this procedure are limited to ageing reactions where one single reaction is predominant and directly

39、correlated to the end-point criteria for a specific application. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, t

40、he latest edition of the referenced document (including any amendments) applies. IEC 60085, Electrical insulation Thermal evaluation and designation IEC 60216-1, Electrical insulating materials Thermal endurance properties Part 1: Ageing procedures and evaluation of test results IEC 60216-2, Electri

41、cal insulating materials Thermal endurance properties Part 2: Determination of thermal endurance properties of electrical insulating materials Choice of test criteria IEC 60216-5, Electrical insulating materials Thermal endurance properties Part 5: Determination of relative thermal endurance index (

42、RTE) of an insulating material. IEC 60216-8, Electrical insulating materials Thermal endurance properties Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures ISO 11357-6, Plastics Differential scanning calorimetry (DSC) Part 6: Determination of oxidatio

43、n induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) ISO 11358-2, Plastics Thermogravimetry (TG) of polymers Part 2: Determination of activation energy ISO 11358-3, Plastics Thermogravimetry (TG) of polymers Part 3: Determination of the activation energy using the Ozaw

44、a-Friedman plot and analysis of the reaction kinetics PD IEC/TS 60216-7-1:2015IEC TS 60216-7-1:2015 IEC 2015 7 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 reaction rate r change of the concentrat

45、ion of a chemical entity as a function of time SOURCE: IUPAC “Goldbook” 3.1.2 extent of reaction progress of a chemical reaction equal to the number of chemical transformations SOURCE: IUPAC “Goldbook” 3.1.3 rate of conversion time derivative of the extent of reaction SOURCE: IUPAC “Goldbook” 3.1.4

46、order of reaction n indication of the number of entities affecting the macroscopic rate of reaction SOURCE: IUPAC “Goldbook” 3.1.5 diagnostic property p property to which TI is related Note 1 to entry: See definition in IEC 60216-1. 3.1.6 rate law empirical differential rate equation, an expression

47、for the rate of a particular reaction in terms of concentrations of chemical species SOURCE: IUPAC “Goldbook” 3.1.7 reaction rate constant k proportionality factor k of a rate law SOURCE: IUPAC “Goldbook” PD IEC/TS 60216-7-1:2015 8 IEC TS 60216-7-1:2015 IEC 2015 3.1.8 Arrhenius equation empirical ex

48、ponential law relating reaction rate constant to reciprocal of absolute temperature SOURCE: IUPAC “Goldbook” 3.1.9 activation energy (Arrhenius activation energy) Eaempirical parameter characterizing the exponential temperature dependence of the reaction rate constant SOURCE: IUPAC “Goldbook” 3.1.10

49、 pre-exponential factor A coefficient of the Arrhenius equation SOURCE: IUPAC “Goldbook” 3.1.11 end-point limit for a diagnostic property value based on which the thermal endurance is evaluated 3.1.12 time to end-point failure time time to reach the end-point or conventional failure 3.1.13 relative temperature endurance index RTE numerical value of the temperature in degrees Celsius at which the estimated time to end-point of the ca