SIST EN IEC 60216-6:2023

Electrical insulating materials - Thermal endurance properties - Part 6: Determination of thermal endurance indices (TI and RTI) of an insulating material using the fixed time frame method (IEC 60216-6:2022)

This part of IEC 60216 specifies the experimental and calculation procedures for deriving the thermal endurance characteristics, temperature index (TI) and relative temperature index (RTI) of an electrical insulating material (EIM) using the "fixed time frame method (FTFM)".
In this protocol, the ageing takes place for a small number of fixed times, using the appropriate number of ageing temperatures throughout each time, the properties of the specimens being measured at the end of the relevant time interval. This differs from the procedure of IEC 60216-1, where ageing is conducted at a small number of fixed temperatures, property measurement taking place after ageing times dependent on the progress of ageing.
The diagnostic tests employed in the fixed time frame method are restricted to destructive tests. The method has not yet been applied to non-destructive or proof test procedures.
Both the TI and the RTI determined according to the FTFM protocol are derived from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2 as modified in this part of IEC 60216. The calculation procedures and statistical tests are modified from those of IEC 60216-3 and IEC 60216-5.

Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens - Teil 6: Bestimmung der thermischen Langzeitkennwerte (TI und RTI) eines Isolierstoffes unter Anwendung des Festzeitrahmenverfahrens (IEC 60216-6:2022)

Matériaux isolants électriques - Propriétés d'endurance thermique - Partie 6: Détermination des indices d’endurance thermique (IT et ITR) d’un matériau isolant en utilisant la méthode de trame de durées fixes (IEC 60216-6:2022)

IEC 60216-6:2022 est disponible sous forme de IEC 60216-6:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 60216-6:2022 spécifie les procédures expérimentales et de calcul à utiliser pour déduire les caractéristiques d’endurance thermique, l’indice de température (IT) et l’indice de température relatif (ITR) d’un matériau isolant électrique (MIE) à l’aide de la "méthode de trame de durées fixes" (FTFM - fixed time frame method). Avec ce protocole, le vieillissement se produit après un petit nombre de durées déterminées, en utilisant le nombre approprié de températures de vieillissement tout au long de chaque durée pertinente, et les propriétés des éprouvettes sont mesurées à la fin de chaque intervalle de temps. Ce protocole diffère de la procédure de l’IEC 60216-1, dans laquelle le vieillissement est effectué à un petit nombre de températures déterminées, et le mesurage des propriétés des éprouvettes est effectué après des temps de vieillissement variables en fonction de la progression du vieillissement. Les essais de diagnostic utilisés dans la méthode de trame de durées fixes sont limités aux essais destructifs. La méthode n’a pas encore été appliquée aux essais non destructifs ni aux procédures d’essais d’épreuve.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- clarification de la définition des propriétés d’indice par rapport aux propriétés d’endurance;
- remaniement complet de l’Annexe G et du programme correspondant.

Elektroizolacijski materiali - Lastnosti v zvezi s toplotno vzdržljivostjo - 6. del: Ugotavljanje indeksov toplotne vzdržljivosti (TI in RTI) izolacijskega materiala z uporabo metode fiksnih časovnih okvirov (IEC 60216-6:2022)

Ta del standarda IEC 60216 določa eksperimentalne in računske postopke za izpeljavo lastnosti toplotne vzdržljivosti, toplotnega indeksa (TI) in relativnega toplotnega indeksa (RTI) elektroizolacijskega materiala (EIM) z uporabo metode »fiksnih časovnih okvirov (FTFM)«.
Po tem protokolu staranje poteka v fiksnih časovnih okvirih ob različnih temperaturah staranja skozi vsak interval, lastnosti vzorcev pa se merijo na koncu ustreznega časovnega intervala. Postopek je drugačen od tistega v standardu IEC 60216-1, kjer se staranje izvaja pri majhnem številu fiksnih temperatur, meritve lastnosti pa se izvajajo po časih staranja, ki so odvisni od napredka staranja.
Diagnostični preskusi, uporabljeni pri metodi fiksnih časovnih okvirov, so omejeni na porušitvene preskuse. Metoda še ni bila uporabljena za neporušitvene ali dokazne postopke preskušanja.
Tako toplotni indeks kot relativni toplotni indeks, določena v skladu s protokolom fiksnih časovnih okvirov, izhajata iz eksperimentalnih podatkov, dobljenih v skladu z navodili iz standardov IEC 60216-1 in IEC 60216-2, kot sta spremenjena v tem delu IEC 60216. Računski postopki in statistični preskusi dopolnjujejo postopke iz standardov IEC 60216-3 in IEC 60216-5.

General Information

• Status: Published
• Publication Date: 30-Jan-2023
• ICS: 17.220.99 - Other standards related to electricity and magnetism
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: IIZS - Insulating materials and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Jan-2023
• Due Date: 30-Mar-2023
• Completion Date: 31-Jan-2023
• Ref Project: EN IEC 60216-6:2023 - Electrical insulating materials - Thermal endurance properties - Part 6: Determination of thermal endurance indices (TI and RTI) of an insulating material using the fixed time frame method

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60216-6:2023
01-marec-2023
Elektroizolacijski materiali - Lastnosti v zvezi s toplotno vzdržljivostjo - 6. del:
Ugotavljanje indeksov toplotne vzdržljivosti (TI in RTI) izolacijskega materiala z
uporabo metode fiksnih časovnih okvirov (IEC 60216-6:2022)
Electrical insulating materials - Thermal endurance properties - Part 6: Determination of
thermal endurance indices (TI and RTI) of an insulating material using the fixed time
frame method (IEC 60216-6:2022)
Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens - Teil
6: Bestimmung der thermischen Langzeitkennwerte (TI und RTI) eines Isolierstoffes
unter Anwendung des Festzeitrahmenverfahrens (IEC 60216-6:2022)
Matériaux isolants électriques - Propriétés d'endurance thermique - Partie 6:
Détermination des indices d’endurance thermique (IT et ITR) d’un matériau isolant en
utilisant la méthode de trame de durées fixes (IEC 60216-6:2022)
Ta slovenski standard je istoveten z: EN IEC 60216-6:2023
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
SIST EN IEC 60216-6:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60216-6:2023


EUROPEAN STANDARD EN IEC 60216-6

NORME EUROPÉENNE

EUROPÄISCHE NORM January 2023
ICS 17.220.99; 29.035.01 Supersedes EN 60216-6:2006
English Version
Electrical insulating materials - Thermal endurance properties -
Part 6: Determination of thermal endurance indices (TI and RTI)
of an insulating material using the fixed time frame method
(IEC 60216-6:2022)
Matériaux isolants électriques - Propriétés d'endurance Elektroisolierstoffe - Eigenschaften hinsichtlich des
thermique - Partie 6: Détermination des indices thermischen Langzeitverhaltens - Teil 6: Bestimmung der
d'endurance thermique (IT et ITR) d'un matériau isolant en thermischen Langzeitkennwerte (TI und RTI) eines
utilisant la méthode de trame de durées fixes Isolierstoffes unter Anwendung des
(IEC 60216-6:2022) Festzeitrahmenverfahrens
(IEC 60216-6:2022)
This European Standard was approved by CENELEC on 2023-01-02. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60216-6:2023 E

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SIST EN IEC 60216-6:2023
EN IEC 60216-6:2023 (E)
European foreword
The text of document 112/583/FDIS, future edition 3 of IEC 60216-6, prepared by IEC/TC 112
"Evaluation and qualification of electrical insulating materials and systems" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 60216-6:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-10-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-01-02
document have to be withdrawn

This document supersedes EN 60216-6:2006 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60216-6:2022 was approved by CENELEC as a European
Standard without any modification.
2

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SIST EN IEC 60216-6:2023
EN IEC 60216-6:2023 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60212 - Standard conditions for use prior to and EN 60212 -
during the testing of solid electrical
insulating materials
IEC 60216-1 2013 Electrical insulating materials - Thermal EN 60216-1 2013
endurance properties - Part 1: Ageing
procedures and evaluation of test results
IEC 60216-2 - Electrical insulating materials - Thermal EN 60216-2 -
endurance properties - Part 2:
Determination of thermal endurance
properties of electrical insulating materials
- Choice of test criteria
IEC 60216-3 2021 Electrical insulating materials - Thermal EN IEC 60216-3 2021
endurance properties - Part 3: Instructions
for calculating thermal endurance
characteristics
IEC 60216-4-1 - Electrical insulating materials - Thermal EN 60216-4-1 -
endurance properties - Part 4-1: Ageing
ovens - Single-chamber ovens
IEC 60216-4-2 - Electrical insulating materials - Thermal EN 60216-4-2 -
endurance properties - Part 4-2: Ageing
ovens - Precision ovens for use up to 300
°C
IEC 60216-4-3 - Electrical insulating materials - Thermal EN 60216-4-3 -
endurance properties - Part 4-3: Ageing
ovens - Multi-chamber ovens
IEC 60216-5 2022 Electrical insulating materials - Thermal EN 60216-5 2022
endurance properties - Part 5:
Determination of relative temperature index
(RTI) of an insulating material
IEC 60493-1 - Guide for the statistical analysis of ageing - -
test data - Part 1: Methods based on mean
values of normally distributed test results

3

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SIST EN IEC 60216-6:2023




IEC 60216-6

®


Edition 3.0 2022-11




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Electrical insulating materials – Thermal endurance properties –

Part 6: Determination of thermal endurance indices (TI and RTI) of an insulating

material using the fixed time frame method



Matériaux isolants électriques – Propriétés d'endurance thermique –

Partie 6: Détermination des indices d’endurance thermique (IT et ITR) d’un


matériau isolant en utilisant la méthode de trame de durées fixes













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 17.220.99; 29.035.01 ISBN 978-2-8322-6022-7




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60216-6:2023
– 2 – IEC 60216-6:2022 © IEC 2022
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviated terms . 11
4 FTFM protocol . 12
4.1 Principles of FTFM protocol . 12
4.2 Objective of FTFM protocol . 12
5 TI determination . 13
5.1 Ageing procedures . 13
5.2 Ageing times and temperatures . 13
5.3 Test specimens . 13
5.3.1 Preparation . 13
5.3.2 Number of specimens . 14
5.4 Diagnostic tests . 14
5.5 Selection of end-points . 15
5.6 Establishment of initial property value . 15
5.7 Ageing conditions . 15
5.7.1 Ageing ovens . 15
5.7.2 Environmental conditions . 15
5.7.3 Conditions for property measurement . 16
5.8 Procedure for ageing . 16
6 Calculation procedures . 16
6.1 General principles . 16
6.1.1 Thermal endurance calculation . 16
6.1.2 Property value – equivalent temperature transform (Calculation of
hypothetical ageing temperature derived from the value of a property) . 17
6.2 Precision of calculations . 17
6.3 Derivation of temperatures equivalent to property values . 17
6.3.1 General . 17
6.3.2 Preliminary calculations . 17
6.3.3 Regression calculations (property on temperature) . 18
6.3.4 Linearity test . 20
6.3.5 Estimation of end-point temperatures equivalent to property values . 21
6.4 Regression analysis (temperature on time) . 21
6.4.1 General . 21
6.4.2 Group means and variances . 21
6.4.3 General means and variances . 21
6.4.4 Regression . 22
6.5 Statistical tests . 23
6.5.1 Variance equality test . 23
6.5.2 Linearity test (F-test) . 24
6.5.3 Estimates of x and y and their confidence limits . 24
6.6 Thermal endurance graph . 26
7 Calculation and requirements for results . 26

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SIST EN IEC 60216-6:2023
IEC 60216-6:2022 © IEC 2022 – 3 –
7.1 Calculation of thermal endurance characteristics . 26
7.2 Reporting of results . 27
7.2.1 Summary of statistical tests and reporting . 27
7.2.2 Report format . 27
8 Report . 27
9 RTI determination . 28
10 Additional symbols. 28
11 Experimental procedures . 29
11.1 Selection of reference EIM . 29
11.2 Selection of diagnostic test for extent of ageing . 29
11.3 Ageing procedures . 29
12 Calculation procedures . 29
12.1 General principles . 29
12.2 Input data . 29
12.3 RTI . 30
12.4 Confidence limits . 31
12.5 Extrapolation. 32
13 Results and report . 33
13.1 Results of statistical and numerical tests. 33
13.2 Result . 33
13.3 Report. 33
Annex A (normative) Decision flow chart . 34
Annex B (normative) Decision table . 36
Annex C (informative) Statistical tables . 37
Annex D (informative) Suggested ageing times and temperatures . 41
D.1 TI determination . 41
D.1.1 Correlation time (TI) = 20 000 h . 41
D.1.2 Other correlation times for TI calculation (see 12.3) . 41
D.2 RTI determination . 42
Annex E (informative) Figures . 43
Annex F (normative)  Statistical significance of the difference between two regression

estimates . 46
Annex G (informative)  Computer program . 47
G.1 General . 47
G.1.1 Overview . 47
G.1.2 Convenience program execution . 48
G.2.1 Content of file Control6.ftd . 50
G.2.2 Report . 52
G.2.3 Thermal endurance graph . 54

Figure A.1 – Decision flow chart . 35
Figure E.1 – Property-temperature graph with regression line . 43
Figure E.2 – Thermal endurance graph . 43
Figure E.3 – Ageing times and temperatures in relation to thermal endurance graph. 44
Figure E.4 – Ageing times and temperatures in relation to thermal endurance graph. 44
Figure E.5 – Ageing times and temperatures in relation to thermal endurance graph. 45

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SIST EN IEC 60216-6:2023
– 4 – IEC 60216-6:2022 © IEC 2022
Figure G.1 – Shortcut property dialog for program launch . 49
Figure G.2 – Thermal endurance graph . 54

Table 1 – Intermediate data values . 30
Table B.1 – Decision table . 36
2
Table C.1 – χ -function . 37
Table C.2 – t-function . 37
Table C.3 – F-function, P = 0,05 . 38
Table C.4 – F-function, P = 0,005 . 39
Table D.1 – Ageing temperatures and times . 41

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SIST EN IEC 60216-6:2023
IEC 60216-6:2022 © IEC 2022 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –
Part 6: Determination of thermal endurance indices (TI and RTI)
of an insulating material using the fixed time frame method
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 this end and
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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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 60216-6 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) clarification of definition of index properties vs. endurance properties;
b) complete rework of Annex G and the corresponding program.

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SIST EN IEC 60216-6:2023
– 6 – IEC 60216-6:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
112/583/FDIS 112/589/RVD

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 document 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.

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SIST EN IEC 60216-6:2023
IEC 60216-6:2022 © IEC 2022 – 7 –
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 6: Determination of thermal endurance indices (TI and RTI)
of an insulating material using the fixed time frame method



1 Scope
This part of IEC 60216 specifies the experimental and calculation procedures for deriving the
thermal endurance characteristics, temperature index (TI) and relative temperature index (RTI)
of an electrical insulating material (EIM) using the “fixed time frame method (FTFM)”.
In this protocol, the ageing takes place for a small number of fixed times, using the appropriate
number of ageing temperatures throughout each time, the properties of the specimens being
measured at the end of the relevant time interval. This differs from the procedure of IEC 60216-
1, where ageing is conducted at a small number of fixed temperatures, property measurement
taking place after ageing times dependent on the progress of ageing.
The diagnostic tests employed in the fixed time frame method are restricted to destructive tests.
The method has not yet been applied to non-destructive or proof test procedures.
Both the TI and the RTI determined according to the FTFM protocol are derived from
experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2
as modified in this part of IEC 60216. The calculation procedures and statistical tests are
modified from those of IEC 60216-3 and IEC 60216-5.
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 60212, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216-1:2013, Electrical insulating materials –Thermal endurance properties – Part 1:
Ageing procedures and evaluation 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 60216-3:2021, Electrical insulating materials – Thermal endurance properties – Part 3:
Instructions for calculating thermal endurance characteristics
IEC 60216-4-1, Electrical insulating materials – Thermal endurance properties – Part 4-1:
Ageing ovens – Single-chamber ovens
IEC 60216-4-2, Electrical insulating materials – Thermal endurance properties – Part 4-2:
Ageing ovens – Precision ovens for use up to 300 °C

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SIST EN IEC 60216-6:2023
– 8 – IEC 60216-6:2022 © IEC 2022
IEC 60216-4-3, Electrical insulating materials – Thermal endurance properties – Part 4-3:
Ageing ovens – Multi-chamber ovens
IEC 60216-5:2022, Electrical insulating materials – Thermal endurance properties – Part 5:
Determination of relative temperature index (RTI) of an insulating material
IEC 60493-1, Guide for the statistical analysis of ageing test data –
...