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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
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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
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...