IEC 62631-2-3:2024

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
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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

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
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