Electrical insulating materials - Thermal endurance properties - Part 3: Instructions for calculating thermal endurance characteristics

IEC 60216-3:2021 is available as IEC 60216-3:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.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

IEC 60216-3:2021 est disponible sous forme de IEC 60216-3:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.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.

General Information

Status
Published
Publication Date
15-Mar-2021
Current Stage
PPUB - Publication issued
Completion Date
16-Mar-2021
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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
IEC 60216-3:2021-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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
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ELECTROTECHNIQUE
INTERNATIONALE
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---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC 60216-3:2021 © IEC 2021 – 3 –

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

Table D.2 – Worked example 2 – Complete data (non-destructive tests: file

TEST2.DTA) ......................................................................................................................... 40

Table D.3 – Worked example 3 – Destructive tests ............................................................... 43

Table D.4 – Worked example 3 – Selection of groups ........................................................... 44

Table E.1 – Non-destructive test data ................................................................................... 49

Table E.2 – Destructive test data .......................................................................................... 49

Table E.3 – Non-destructive test data ................................................................................... 50

Table E.4 – Destructive test data .......................................................................................... 50

---------------------- Page: 5 ----------------------
– 4 – IEC 60216-3:2021 © 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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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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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 IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 60216-3 has been prepared by IEC technical committee 112: Evaluation and qualification

of electrical insulating materials and systems. It is an International Standard.

This third edition cancels and replaces the second edition published in 2006. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) a new computer program has been included;
b) Annex E " has been completely reworked.
---------------------- Page: 6 ----------------------
IEC 60216-3:2021 © IEC 2021 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
112/475/CDV 112/495/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,

available at www.iec.ch/members_experts/refdocs. The main document types developed by

IEC are described in greater detail at www.iec.ch/standardsdev/publications.

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 document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 60216-3:2021 © IEC 2021
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –
Part 3: Instructions for calculating
thermal endurance characteristics
1 Scope

This part of IEC 60216 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 [1] , 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:

Ageing procedures and evaluation of test results
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
ordered data

group of data arranged in sequence so that in the appropriate direction through the sequence

each member is greater than, or equal to, its predecessor

Note 1 to entry: In this document, ascending order implies that the data is ordered in this way, the first being the

smallest.
___________
Numbers in square brackets refer to the bibliography.
---------------------- Page: 8 ----------------------
IEC 60216-3:2021 © IEC 2021 – 7 –

Note 2 to entry: It has been established that the term "group" is used in the theoretical statistics literature to

represent a subset of the whole data set. The group comprises those data having the same value of one of the

parameters of the set (e.g. ageing temperature). A group may itself comprise a number of sub-groups

characterized by another parameter (e.g. time in the case of destructive tests).
3.1.2
order-statistic

assigned numerical position in the sequence of individual values in a group of ordered data

3.1.3
incomplete data
ordered data, where the values above and/or below defined points are not known
3.1.4
censored data
incomplete data, where the number of unknown values is known

Note 1 to entry: If the censoring is begun above/below a specified numerical value, the censoring is Type I.

If above/below a specified order-statistic it is Type II. This document is concerned only with Type II.

3.1.5
degrees of freedom
number of data values minus the number of parameter values
3.1.6
variance of a data group
sum of the squares of the deviations of the data from a reference level

Note 1 to entry: The reference level may be defined by one or more parameters, for example a mean value (one

parameter) or a line (two parameters, slope and intercept), divided by the number of degrees of freedom.

3.1.7
central second moment of a data group

sum of the squares of the differences between the data values and the value of the group

mean, divided by the number of data in the group
3.1.8
covariance of data groups

for two groups of data with equal numbers of elements where each element in one group

corresponds to one in the other, the sum of the products of the deviations of the

corresponding members from their group means, divided by the number of degrees of

freedom
3.1.9
regression analysis

process of deducing the best-fit line expressing the relation of corresponding members of two

data groups by minimizing the sum of squares of deviations of members of one of the groups

from the line
Note 1 to entry: The parameters are referred to as the regression coefficients.
3.1.10
correlation coefficient

number expressing the completeness of the relation between members of two data groups,

equal to the covariance divided by the square root of the product of the variances of the

groups

Note 1 to entry: The value of its square is between 0 (no correlation) and 1 (complete correlation).

---------------------- Page: 9 ----------------------
– 8 – IEC 60216-3:2021 © IEC 2021
3.1.11
end-point line

line parallel to the time axis intercepting the property axis at the end-point value

Note 1 to entry: For guidance on the choice of end-point value, refer to IEC 60216-2.

3.2 Symbols and abbreviated terms
Subclause
a Regression coefficient (y-intercept) 4.3, 6.2
a Regression coefficient for destructive test calculations 6.1
b Regression coefficient (slope) 4.3, 6.2
b Regression coefficient for destructive test calculations 6.1
b 6.3
Intermediate constant (calculation of )
c 6.3
Intermediate constant (calculation of χ )
f Number of degrees of freedom Table C.2 to
Table C.5
F Fisher distributed stochastic variable 4.2, 6.1, 6.3
F Tabulated value of F (linearity of thermal endurance graph) 4.4, 6.3
F Tabulated value of F (linearity of property graph – significance 6.1
0,05)
F Tabulated value of F (linearity of property graph – significance 6.1
0,005)
g Order number of ageing time for destructive tests 6.1
h Order number of property value for destructive tests 6.1
HIC Halving interval at temperature equal to TI 4.3, Clause 7
HIC Halving interval corresponding to TI 7.3
g g
i Order number of exposure temperature 4.1, 6.2
j Order number of time to end-point 4.1, 6.2
k Number of ageing temperatures 4.1, 6.2
m 4.1, 6.1
Number of specimens aged at temperature ϑ
N Total number of times to end-point 6.2
n Number of property values in group aged for time τ 6.1
g g
n 4.1, 6.1
Number of values of y at temperature ϑ
Mean value of property values in selected groups 6.1
p Value of diagnostic property 6.1
P Significance level of χ distribution 4.4, 6.3.1
p Value of diagnostic property at end-point for destructive tests 6.1
6.1
Mean of property values in group aged for time τ
p Individual property value 6.1
q Base of logarithms 6.3
r Number of ageing times selected for inclusion in calculation 6.1
(destructive tests)
r Square of correlation coefficient 6.2.3
s 2 2 6.3
Weighted mean of s and s
1 2
---------------------- Page: 10 ----------------------
IEC 60216-3:2021 © IEC 2021 – 9 –
Subclause
2 2
4.3, 6.1 to 6.3
s s
Weighted mean of , pooled variance within selected groups
1 1i
2 4.4, 6.3
Adjusted value of s
( 1 )
Variance of property values in group aged for time τ 6.1
s g
2 4.3, 6.2
Variance of y values at temperature ϑ
2 Variance about regression line 6.1 to 6.3
2 Adjusted value of s 6.3
2 Intermediate constant 6.3
2 Variance of Y 6.3
t Student distributed stochastic variable 6.3
t Adjusted value of t (incomplete data) 6.3
TC Lower 95 % confidence limit of TI 4.4, 7
TC Adjusted value of TC 7.1
TI Temperature index 4.3, Clause 7
TI Temperature index at 10 kh 7.1
TI Adjusted value of TI 7.3
TI Temperature index obtained by graphical means or without 7.3
defined confidence limits
x Independent variable: reciprocal of thermodynamic
temperature
Weighted mean value of x 6.2
X Specified value of x for estimation of y 6.3
Estimated value of x at specified value of y 6.3
6.3
ˆ Upper 95 % confidence limit of X
x 4.1, 6.1
Reciprocal of thermodynamic temperature corresponding to ϑ
Weighted mean value of y 6.2
y Dependent variable: logarithm of time to end-point
Estimated value of y at specified value of x 6.3
Y Specified value of y for estimation of x 6.3
6.3
Lower 95 % confidence limit of Y
y 4.3, 6.2
Mean values of y at temperature ϑ
ij i
y 4.1, 6.1
Value of y corresponding to τ
Mean value of z 6.1
...

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