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

1、BSI Standards Publication Electrical insulation materials Thermal endurance properties Part 71: Accelerated determination of relative thermal endurance using analytical test methods (RTE A ) Instructions for calculations based on activation energy PD IEC/TS 60216-7-1:2015National foreword This Publi

2、shed Document is the UK implementation of IEC/TS 60216-7-1:2015. The UK participation in its preparation was entrusted to Technical Committee GEL/112, Evaluation and qualification of electrical insulating materials and systems. A list of organizations represented on this committee can be obtained on

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

4、Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 April 2015. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TS

5、60216-7-1:2015IEC TS 60216-7-1 Edition 1.0 2015-03 TECHNICAL SPECIFICATION Electrical insulation materials Thermal endurance properties Part 7-1: Accelerated determination of relative thermal endurance using analytical test methods (RTE A ) Instructions for calculations based on activation energy IN

6、TERNATIONAL ELECTROTECHNICAL COMMISSION 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

7、. 3 INTRODUCTION . 5 1 Scope 6 2 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

8、, r . 11 5.2 Extent of reaction 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 ref

9、erence point . 17 8 Calculation procedures 17 8.1 Determination of the kinetic parameters . 17 8.2 Determination of analytical temperature endurance index, RTE A , and halving interval, HIC A. 17 8.3 Determination of RTE A17 General . 17 8.3.1Calculation . 18 8.3.2 9 Test report. 19 Bibliography . 2

10、1 Figure 1 Thermal endurance graph for 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 determinatio

11、n of relative thermal endurance using analytical test methods (RTE A ) 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 Nat

12、ional 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 International Standards, Technical Specifications, Technical Reports, Publ

13、icly 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 this preparatory work. International, governmental and non- gover

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15、n technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepte

16、d by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international

17、 uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latte

18、r. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should

19、 ensure that they have the latest edition 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

20、 of any nature whatsoever, whether direct 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 th

21、e 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 rights.

22、 The main task of IEC technical committees 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 repeat

23、ed efforts, or the subject is still under 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 b

24、e transformed into International Standards. 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

25、technical specification is based on the 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

26、accordance with the ISO/IEC Directives, 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 un

27、changed 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 transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingu

28、al version of this publication may be issued 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 th

29、erefore of limited use during development 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) t

30、o reduce project times and cost. A short-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 f

31、urther test times is considered in this 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

32、 with the HIC of the thermal endurance. 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 se

33、lected life, typically 20 000 h, i.e. an 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 temperatur

34、e and environment as a reference material 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

35、restrictions these methods imply. At present, 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 genera

36、l assessment process of the procedures will 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 m

37、ethods (RTE A ) Instructions for calculations 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 t

38、hermal degradation reaction and a conventional 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 si

39、ngle reaction is predominant and directly 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 editio

40、n 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 60216-1, Electrical insulating materials Thermal endurance properties Part 1: Ageing procedures and evalu

41、ation of test results IEC 60216-2, Electrical 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: Determina

42、tion of relative thermal endurance index (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 calorimet

43、ry (DSC) Part 6: Determination of oxidation 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: Determinati

44、on of the activation energy using the Ozawa-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.

45、1 reaction rate r change of the concentration 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 o

46、f reaction SOURCE: IUPAC “Goldbook” 3.1.4 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

47、differential rate equation, an expression 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

48、2015 3.1.8 Arrhenius equation empirical exponential law relating reaction rate constant to reciprocal of absolute temperature SOURCE: IUPAC “Goldbook” 3.1.9 activation energy (Arrhenius activation energy) E aempirical parameter characterizing the exponential temperature dependence of the reaction ra

49、te constant SOURCE: IUPAC “Goldbook” 3.1.10 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 whi