IEC 62631-3-4:2019

IEC 62631-3-4 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dielectric and resistive properties of solid insulating materials –
Part 3-4: Determination of resistive properties (DC methods) – Volume
resistance and volume resistivity at elevated temperatures

Propriétés diélectriques et résistives des matériaux isolants solides –
Partie 3-4: Détermination des propriétés résistives (méthodes en courant
continu) – Résistance transversale et résistivité transversale aux températures
élevées
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IEC 62631-3-4 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dielectric and resistive properties of solid insulating materials –

Part 3-4: Determination of resistive properties (DC methods) – Volume

resistance and volume resistivity at elevated temperatures

Propriétés diélectriques et résistives des matériaux isolants solides –

Partie 3-4: Détermination des propriétés résistives (méthodes en courant

continu) – Résistance transversale et résistivité transversale aux températures

élevées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99; 29.035.01 ISBN 978-2-8322-6688-5

– 2 – IEC 62631-3-4:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Significance . 6
5 Method of test . 6
5.1 General . 6
5.2 Power supply and test voltages . 6
5.3 Equipment . 6
5.3.1 Specimens and electrodes . 6
5.3.2 Heating chamber . 7
5.3.3 Measuring leads . 7
5.3.4 Temperature control . 7
5.3.5 Special precautions during measurements . 8
5.4 Calibration . 8
6 Procedure . 8
6.1 Continuously increasing temperature (method A) . 8
6.2 Increasing the temperature by steps (method B) . 8
6.3 Precautions to be taken . 9
6.4 Calculation of volume resistivity . 9
7 Report . 9
Annex A (informative) Principle of test apparatus . 11
Bibliography . 14

Figure A.1 – Circuit diagram of test apparatus . 11
Figure A.2 – Structure diagram of test apparatus . 12
Figure A.3 – Pictures of test apparatus . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIELECTRIC AND RESISTIVE PROPERTIES OF SOLID
INSULATING MATERIALS –
Part 3-4: Determination of resistive properties (DC methods) –
Volume resistance and volume resistivity at elevated temperatures

FOREWORD
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International Standard IEC 62631-3-4 has been prepared by IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems.
This edition of IEC 62631-3-4 cancels and replaces IEC 60345 “Method of test for electrical
resistance and resistivity of insulating materials at elevated temperatures”, published in 1971.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 60345:
a) The revised standard becomes part of the series IEC 62631-3-x. Title of the standard is
changed and adapted to the series as Part 3-4.
b) Clauses 2 "Normative references", 3 "Terms and definitions", and 4 "Significance" are
added.
– 4 – IEC 62631-3-4:2019 © IEC 2019
c) Subclauses 5.2 "Power supply, Voltage", 5.3.1.2 "Number of test specimens" and 5.3.1.3
"Conditioning and pre-treatment of test specimens" are added.
d) In 5.3.5 "Special precautions during measurements", errors analysis in the measurement
of current are modified, and aligned with IEC 62631-3-1.
e) In 6.2 "Increasing the temperature by steps (method B)", the method for more than one
specimen is removed.
f) The standard atmospheric conditions for testing and conditioning, especially the
temperature, are replaced according to IEC 60212.
g) The circuit diagram of test apparatus is modified, and the str
...