IEC 60216-3:2021
(Main)Electrical insulating materials - Thermal endurance properties - Part 3: Instructions for calculating thermal endurance characteristics
Electrical insulating materials - Thermal endurance properties - Part 3: Instructions for calculating thermal endurance characteristics
IEC 60216-3:2021 specifies the calculation procedures used for deriving thermal endurance characteristics from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2, using fixed ageing temperatures and variable ageing times. The experimental data can be obtained using non-destructive, destructive or proof tests. Data obtained from non-destructive or proof tests can be incomplete, in that it is possible that measurement of times taken to reach the end-point will have been terminated at some point after the median time but before all specimens have reached end-point. The procedures are illustrated by worked examples, and suitable computer programs are recommended to facilitate the calculations.
This edition includes the following significant technical changes with respect to the previous edition:
- a new computer program has been included;
- Annex E " has been completely reworked.
Matériaux isolants électriques - Propriétés d’endurance thermique - Partie 3: Instructions pour le calcul des caractéristiques d’endurance thermique
L'IEC 60216-3:2021 spécifie les méthodes de calcul utilisées pour obtenir les caractéristiques d'endurance thermique à partir des données expérimentales obtenues conformément aux instructions de l'IEC 60216-1 et de l'IEC 60216-2, en utilisant des températures de vieillissement fixes et des temps de vieillissement variables.
Les données expérimentales peuvent être obtenues en utilisant des essais non destructifs, des essais destructifs ou des essais d'épreuve. Les données obtenues à partir d'essais non destructifs ou d'essais d'épreuve peuvent être incomplètes, en ce sens que le mesurage des temps mis pour atteindre le point limite peut avoir été interrompu à un moment situé après le temps médian, mais avant que toutes les éprouvettes n'aient atteint le point limite. Les méthodes sont illustrées par des exemples pratiques, et des programmes informatiques adaptés sont recommandés pour faciliter les calculs.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- un nouveau programme informatique est inclus;
- l'Annexe E a été complètement remaniée.
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IEC 60216-3 ®
Edition 3.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
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Electrical insulating materials – Thermal endurance properties –
Part 3: Instructions for calculating thermal endurance characteristics
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 60216-3 ®
Edition 3.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 3: Instructions for calculating thermal endurance characteristics
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.99; 19.020 ISBN 978-2-8322-9583-0
– 2 – IEC 60216-3:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviated terms . 8
4 Principles of calculations . 10
4.1 General principles . 10
4.2 Preliminary calculations . 11
4.2.1 General . 11
4.2.2 Non-destructive tests . 11
4.2.3 Proof tests . 11
4.2.4 Destructive tests . 11
4.3 Variance calculations . 12
4.4 Statistical tests . 12
4.5 Results . 13
5 Requirements and recommendations for valid calculations . 13
5.1 Requirements for experimental data . 13
5.1.1 General . 13
5.1.2 Non-destructive tests . 13
5.1.3 Proof tests . 13
5.1.4 Destructive tests . 13
5.2 Precision of calculations . 14
6 Calculation procedures . 14
6.1 Preliminary calculations . 14
6.1.1 Temperatures and x-values . 14
6.1.2 Non-destructive tests . 14
6.1.3 Proof tests . 14
6.1.4 Destructive tests . 14
6.1.5 Incomplete data . 18
6.2 Main calculations . 18
6.2.1 Calculation of group means and variances . 18
6.2.2 General means and variances . 19
6.2.3 Regression calculations . 20
6.3 Statistical tests . 21
6.3.1 Variance equality test . 21
6.3.2 Linearity test (F-test) . 21
6.3.3 Confidence limits of X and Y estimates . 22
6.4 Thermal endurance graph . 23
7 Calculation and requirements for results . 23
7.1 Calculation of thermal endurance characteristics . 23
7.2 Summary of statistical tests and reporting . 24
7.3 Reporting of results . 24
8 Test report . 24
Annex A (normative) Decision flow chart . 26
Annex B (normative) Decision table . 28
Annex C (informative) Statistical tables . 29
Annex D (informative) Worked examples. 39
Annex E (informative) Computer program . 48
E.1 General . 55
E.1.1 Overview . 55
E.1.2 Convenience program execution . 56
E.2 Structure of data files used by the program . 58
E.2.1 Text file formats . 58
E.2.2 Office Open XML formats. 59
E.3 Data files for computer program . 60
E.4 Output files and graph . 65
Bibliography . 66
Figure 1 – Example of groups selection . 15
Figure A.1 – Decision flow chart . 27
Figure D.1 – Thermal endurance graph . 44
Figure D.2 – Example 3: Property-time graph (destructive-test data) . 46
Figure E.1 – Shortcut property dialog for program launch . 57
Figure E.2 – Thermal endurance graph of example N3 . 65
Table B.1 – Decisions and actions according to tests . 28
Table C.1 – Coefficients for censored data calculations . 29
Table C.2 – Fractiles of the F-distribution, F(0,95, f , f ) . 35
n d
Table C.3 – Fractiles of the F-distribution, F(0,995, f , f ) . 36
n d
Table C.4 – Fractiles of the t-distribution, t . 38
0,95
Table C.5 – Fractiles of the χ -distribution . 38
Table D.1 – Worked example 1 – Censored data (proof tests: file CENEX3.DTA) . 39
Table D.2 – Worked example 2 – Complete data (non-destructive tests: file
TEST2.DTA) . 41
Table D.3 – Worked example 3 – Destructive tests . 45
Table D.4 – Worked example 3 – Selection of groups . 47
Table E.1 – Non-destructive test data . 58
Table E.2 – Destructive test data . 58
Table E.3 – Non-destructive test data . 59
Table E.4 – Destructive test data . 59
– 4 – IEC 60216-3:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –
Part 3: Instructions for calculating
thermal endurance characteristics
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 to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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3) IEC Publications have the form of recommendations for international use and are accepted 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 respons
...
IEC 60216-3 ®
Edition 3.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 3: Instructions for calculating thermal endurance characteristics
Matériaux isolants électriques – Propriétés d'endurance thermique –
Partie 3: Instructions pour le calcul des caractéristiques d'endurance thermique
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
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IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
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If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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IEC 60216-3 ®
Edition 3.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 3: Instructions for calculating thermal endurance characteristics
Matériaux isolants électriques – Propriétés d'endurance thermique –
Partie 3: Instructions pour le calcul des caractéristiques d'endurance thermique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99; 19.020 ISBN 978-2-8322-9440-6
– 2 – IEC 60216-3:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviated terms . 8
4 Principles of calculations . 10
4.1 General principles . 10
4.2 Preliminary calculations . 10
4.2.1 General . 10
4.2.2 Non-destructive tests . 11
4.2.3 Proof tests . 11
4.2.4 Destructive tests . 11
4.3 Variance calculations . 12
4.4 Statistical tests . 12
4.5 Results . 13
5 Requirements and recommendations for valid calculations . 13
5.1 Requirements for experimental data . 13
5.1.1 General . 13
5.1.2 Non-destructive tests . 13
5.1.3 Proof tests . 13
5.1.4 Destructive tests . 13
5.2 Precision of calculations . 14
6 Calculation procedures . 14
6.1 Preliminary calculations . 14
6.1.1 Temperatures and x-values . 14
6.1.2 Non-destructive tests . 14
6.1.3 Proof tests . 14
6.1.4 Destructive tests . 14
6.1.5 Incomplete data . 18
6.2 Main calculations . 18
6.2.1 Calculation of group means and variances . 18
6.2.2 General means and variances . 19
6.2.3 Regression calculations . 20
6.3 Statistical tests . 21
6.3.1 Variance equality test . 21
6.3.2 Linearity test (F-test) . 21
6.3.3 Confidence limits of X and Y estimates . 22
6.4 Thermal endurance graph . 23
7 Calculation and requirements for results . 23
7.1 Calculation of thermal endurance characteristics . 23
7.2 Summary of statistical tests and reporting . 24
7.3 Reporting of results . 24
8 Test report . 24
Annex A (normative) Decision flow chart . 26
Annex B (normative) Decision table . 27
Annex C (informative) Statistical tables . 28
Annex D (informative) Worked examples. 38
Annex E (informative) Computer program . 46
E.1 General . 46
E.1.1 Overview . 46
E.1.2 Convenience program execution . 47
E.2 Structure of data files used by the program . 48
E.2.1 Text file formats . 48
E.2.2 Office Open XML formats. 50
E.3 Data files for computer program . 51
E.4 Output files and graph . 56
Bibliography . 57
Figure 1 – Example of groups selection . 15
Figure A.1 – Decision flow chart . 26
Figure D.1 – Thermal endurance graph . 42
Figure D.2 – Example 3: Property-time graph. 44
Figure E.1 – Shortcut property dialog for program launch . 47
Figure E.2 – Thermal endurance graph of example N3 . 56
Table B.1 – Decisions and actions according to tests . 27
Table C.1 – Coefficients for censored data calculations . 28
Table C.2 – Fractiles of the F-distribution, F(0,95, f , f ) . 34
n d
Table C.3 – Fractiles of the F-distribution, F(0,995, f , f ) . 35
n d
Table C.4 – Fractiles of the t-distribution, t . 37
0,95
Table C.5 – Fractiles of the χ -distribution . 37
Table D.1 – Worked example 1 – Censored data (proof tests: file CENEX3.DTA) . 38
Ta
...
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