EN IEC 62631-2-3:2024

SLOVENSKI STANDARD
01-julij-2024
Dielektrične in uporovne lastnosti trdnih izolacijskih materialov - 2-3. del:
Relativna permitivnost in faktor dielektričnih izgub - Metoda kontaktne elektrode
za izolacijske folije - Metode AC (IEC 62631-2-3:2024)
Dielectric and resistive properties of solid insulating materials - Part 2-3: Relative
permittivity and dissipation factor - Contact electrode method for insulating films - AC
methods (IEC 62631-2-3:2024)
Dielektrische und resistive Eigenschaften fester Isolierstoffe - Teil 2-3: Bestimmung der
relativen Permittivität und des dielektrischen Verlustfaktors
(Wechselspannungsverfahren) - Kontaktelektrodenverfahren für Isolierschichten (IEC
62631-2-3:2024)
Propriétés diélectriques et résistives des matériaux isolants solides - Partie 2-3 :
Permittivité relative et facteur de dissipation - Méthode d'électrode de contact pour films
isolants - Méthodes en courant alternatif (IEC 62631-2-3:2024)
Ta slovenski standard je istoveten z: EN IEC 62631-2-3:2024
ICS:
17.220.99 Drugi standardi v zvezi z Other standards related to
elektriko in magnetizmom electricity and magnetism
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62631-2-3

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 17.220.99; 29.035.01
English Version
Dielectric and resistive properties of solid insulating materials -
Part 2-3: Relative permittivity and dissipation factor - Contact
electrode method for insulating films - AC methods
(IEC 62631-2-3:2024)
Propriétés diélectriques et résistives des matériaux isolants Dielektrische und resistive Eigenschaften fester Isolierstoffe
solides - Partie 2-3 : Permittivité relative et facteur de - Teil 2-3: Bestimmung der relativen Permittivität und des
dissipation - Méthode d'électrode de contact pour films dielektrischen Verlustfaktors (Wechselspannungsverfahren)
isolants - Méthodes en courant alternatif - Kontaktelektrodenverfahren für Isolierschichten
(IEC 62631-2-3:2024) (IEC 62631-2-3:2024)
This European Standard was approved by CENELEC on 2024-05-10. 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62631-2-3:2024 E

European foreword
The text of document 112/631/FDIS, future edition 1 of IEC 62631-2-3, 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 62631-2-3:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-10
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-10
document have to be withdrawn
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 62631-2-3:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62631-2-1:2018 NOTE Approved as EN IEC 62631-2-1:2018 (not modified)
ISO 25178-2 NOTE Approved as EN ISO 25178-2
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60674-2 — Specification for plastic films for electrical EN 60674-2 —
purposes - Part 2: Methods of test
ISO 4593 — Plastics - Film and sheeting - — —
Determination of thickness by mechanical
scanning
ISO 14644-1 — Cleanrooms and associated controlled EN ISO 14644-1 —
environments – Part 1: Classification of air
cleanliness by particle concentration
ISO 21920-2 — Geometrical product specifications (GPS) – EN ISO 21920-2 —
Surface texture: Profile – Part 2: Terms,
definitions and surface texture parameters

IEC 62631-2-3 ®
Edition 1.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Dielectric and resistive properties of solid insulating materials –

Part 2-3: Relative permittivity and dissipation factor – Contact electrode method

for insulating films – AC methods

Propriétés diélectriques et résistives des matériaux isolants solides –

Partie 2-3 : Permittivité relative et facteur de dissipation – Méthode d'électrode

de contact pour films isolants – Méthodes en courant alternatif

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99, 29.035.01 ISBN 978-2-8322-8684-5

– 2 – IEC 62631-2-3:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviated terms and symbols . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms and symbols . 9
4 Principle of method . 10
4.1 Principle of measurement. 10
4.2 Edge effect of electrodes . 11
5 Electrodes . 11
5.1 Design and manufacture of electrodes . 11
5.2 Edge effect of the measuring electrode . 13
6 Samples . 13
7 Measuring voltage . 13
8 Environmental conditions for measurements . 13
9 Measurement of thickness for films . 14
10 Measurement procedure . 14
11 Report . 14
12 Repeatability, reproducibility and replicability . 14
Annex A (normative) Correction method of measured permittivity and dielectric
dissipation factor for a sample with scabrous surfaces . 15
A.1 General . 15
A.2 Physical model . 15
A.3 Relationship between the measured permittivity and the real permittivity . 16
A.4 Relationship between the measured dielectric dissipation factor and the real
dielectric dissipation factor . 21
A.5 Method of correction for the sample with scabrous surfaces . 25
Annex B (informative) Suggestions for the manufacture of electrodes . 26
B.1 General . 26
B.2 Materials . 26
B.3 Manufacture of electrodes . 26
B.4 Evaluation methods of flatness and roughness. 26
B.5 Resistance of the measuring electrode system. 26
Bibliography . 27

Figure 1 – Diagram of the three-electrode system . 12
Figure A.1 – Schematic diagram of the profile including scabrous surfaces of sample
and polished flat electrodes, with the density thickness and apparent thickness
(mechanical thickness) . 15
Figure A.2 – Physical model of the scabrous surfaces of the sample and polished flat
electrodes . 15

IEC 62631-2-3:2024 © IEC 2024 – 3 –
Figure A.3 – Equivalent circuits with the sample, the gap and the electrodes . 16
Figure A.4 – Relationship between the measured permittivity, the real permittivity, the
void ratio and the contact ratio . 21
Figure A.5 – Relationship between the measured dielectric dissipation factor, the real
dielectric dissipation factor, the void ratio and the contact ratio . 25

Table 1 – Dimensional parameters of the three-electrode system and the relationship
between the measured ε for the thickness of sample and the measured capacitance . 12
x
– 4 – IEC 62631-2-3:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIELECTRIC AND RESISTIVE PROPERTIES OF
SOLID INSULATING MATERIALS –
Part 2-3: Relative permittivity and dissipation factor –
Contact electrode method for insulating films – AC methods

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
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly 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-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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
interested IEC National Committees.
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 responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international 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 latter.
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 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 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 the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 62631-2-3 has been prepared by IEC technical committee 112: Evaluation and qualification
of electrical insulating materials and systems. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
112/631/FDIS 112/641/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
IEC 62631-2-3:2024 © IEC 2024 – 5 –
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/publications.
A list of all parts in the IEC 62631 series, published under the general title Dielectric and
resistive properties of solid insulating materials, 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, or
• revised.
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.

– 6 – IEC 62631-2-3:2024 © IEC 2024
INTRODUCTION
Measuring the relative permittivity and the dielectric dissipation factor (tan δ) of thin insulating
polymer films with a thickness of approximately 10 μm to 100 μm without any additional layer
is important for insulation applications. There is currently a lack of suitable technology and
standard for the measurement of the relative permittivity and dielectric dissipation factor of very
thin single-layer polymer films. By using multilayer polymer films with 20 to 50 layers, it can be
feasible to get the average value of the relative permittivity and dielectric dissipation factor of
an insulating polymer film, but the effect of air gap inside should not be ignored. With metallized
electrodes on the surface of the polymer film, it is possible to get acceptable results of the
relative permittivity and dielectric dissipation factor of an insulating polymer film in research
laboratory. This document provides the measuring technology and the test method for the
relative permittivity and dielectric dissipation factor of thin insulating polymer films without any
additional layer or metallization on the sample, under technical frequency.

IEC 62631-2-3:2024 © IEC 2024 – 7 –
DIELECTRIC AND RESISTIVE PROPERTIES OF
SOLID INSULATING MATERIALS –
Part 2-3: Relative permittivity and dissipation factor –
Contact electrode method for insulating films – AC methods

1 Scope
This part of IEC 62631 specifies the measuring technology and the test method for the relative
permittivity and dielectric dissipation factor of thin single layer insulating polymer film without
any additional metallization on the sample surface. The adaptive thickness range is
approximately 10 μm to 100 μm. The proposed frequency is the power frequency (50 Hz or
60 Hz), and it is also suitable in the technical frequency range from 1 Hz to 1 MHz.
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 60674-2, Specification for plastic films for electrical purposes – Part 2: Methods of test
ISO 4593, Plastics – Film and sheeting – Determination of thickness by mechanical scanning
ISO 14644-1, Cleanrooms and associated controlled environments – Part 1: Classification of
air cleanliness by particle concentration
ISO 21920-2, Geometrical product specifications (GPS) – Surface texture: Profile – Part 2:
Terms, definitions and surface texture parameters
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
thin insulating polymer film
insulating polymer film, planar, even and smooth, without any additional layer, with a 10 μm to
100 μm uniform thickness
– 8 – IEC 62631-2-3:2024 © IEC 2024
3.1.2
AC bridge
instrument that uses the balance method to measure the capacitance and loss of a capacitor
sample under AC voltage
EXAMPLE Capacitor bridge.
Note 1 to entry: The AC bridge usually works under power frequency with a very high accuracy and with a low
applied voltage.
Note 2 to entry: In some special cases, the AC bridge can also work under a technical frequency.
3.1.3
impedance material analyser
instrument that uses the AC current method to measure the capacitance and dielectric loss of
a capacitor
Note 1 to entry: The impedance material analyser works under a relatively low voltage and with a large band range,
but its accuracy is usually relatively low.
Note 2 to entry: The impedance material analyser uses five terminals to measure the device parameters and
therefore a suitable adaptor for the three-electrode sample is necessary.
3.1.4
power frequency
frequency used for the power system, which is usually of 50 Hz or 60 Hz
3.1.5
apparent thickness
mechanical thickness
thickness of a sample measured by a mechanical apparatus, which is equivalent to the "bulking
thickness" specified in IEC 60674-2
3.1.6
density thickness
thickness of a sample measured from the density of the sample, which is equivalent to the
"gravimetric thickness" specified in IEC 60674-2
3.1.7
void ratio
α
percentage increase between the apparent thickness and the density thickness, which is
dependent on the surface roughness
Note 1 to entry: For a sample with a scabrous surface, the apparent thickness and the density thickness are
different.
Note 2 to entry: The void ratio α is expressed in per cent (%) and is defined by Formula (1):
d − d
xd
α ⋅100(%)
(1)
d
x
where
d is th
...