EN IEC 62631-3-4:2019

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

This part of IEC 62631 covers procedures for the determination of insulation resistance and volume resistivity of insulating materials by applying DC-voltage and temperatures up to 800 °C. The typical application materials include high temperature mica plate and alumina ceramics.

Dielektrische und resistive Eigenschaften fester Isolierstoffe – Teil 3-4: Bestimmung resistiver Eigenschaften (Gleichspannungsverfahren) – Durchgangswiderstand und spezifischer Durchgangswiderstand bei erhöhten Temperaturen

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

La présente partie de l'IEC 62631 couvre les procédures de détermination de la résistance d'isolement et de la résistivité transversale des matériaux isolants en appliquant une tension continue et des températures jusqu'à 800 °C. Les matériaux d'application classiques incluent les plaques de mica et les céramiques d'alumine haute température.

Dielektrične in uporovne lastnosti trdnih izolacijskih materialov - 3-4. del: Ugotavljanje uporovnih lastnosti (metode z enosmernim tokom) - Prehodna upornost in specifična prehodna upornost pri povišanih temperaturah (IEC 62631-3-4:2019)

Ta del standarda IEC 62631 zajema postopke za določanje izolacijske upornosti in specifične prehodne upornosti izolacijskih materialov z enosmernim tokom in temperaturami do 800 °C. Običajni uporabljeni materiali vključujejo visokotemperaturne ploščice iz sljude in aluminijevo oksidno keramiko.

General Information

• Status: Published
• Publication Date: 09-May-2019
• Withdrawal Date: 01-May-2022
• ICS: 17.220.99 - Other standards related to electricity and magnetism
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: CLC/SR 112 - Evaluation and qualification of electrical insulating materials and systems (to be defined)
• Drafting Committee: IEC/TC 112 - IEC_TC_112
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 10-May-2019
• Completion Date: 10-May-2019
• Ref Project: SIST EN IEC 62631-3-4:2019 - 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 (IEC 62631-3-4:2019)

Overview

EN IEC 62631-3-4:2019 (CLC adoption of IEC 62631-3-4:2019) specifies DC test methods for determining volume resistance and volume resistivity of solid insulating materials at elevated temperatures (up to 800 °C). It is part of the IEC 62631 series on dielectric and resistive properties of insulating materials and updates/replaces older guidance (IEC 60345). Typical target materials include high-temperature mica plates and alumina ceramics. The standard defines scope, terms, test significance, equipment, procedures, calibration and reporting requirements.

Key topics and requirements

• Test scope and limits
  • Measurement of insulation resistance and volume resistivity using DC voltages at temperatures up to 800 °C.
  • Applies to solid insulating materials used in high-temperature environments.
• Equipment and setup
  • Requirements for specimens and electrodes, heating chamber, measuring leads, and temperature control.
  • Annex A provides circuit, structure diagrams and apparatus photographs to aid implementation.
• Test procedures
  • Two principal temperature procedures: Method A (continuously increasing temperature) and Method B (temperature increased in steps).
  • Calibration and special precautions for accurate current and resistance measurement (error analysis aligned with IEC 62631-3-1).
• Calculations and reporting
  • Procedures for calculating volume resistivity from measured volume resistance and specimen geometry.
  • Mandatory report content (test conditions, specimen details, voltage, temperature profile, results).
• Normative references
  • Relies on IEC 60212 for standard atmospheric conditions and IEC 62631-3-1 for general DC resistive methods.

Applications and users

Who uses EN IEC 62631-3-4:2019:

• Manufacturers of high-temperature insulating materials (mica, ceramics, composites) for quality control and product development.
• Materials testing laboratories and R&D teams measuring volume resistivity and insulation behavior under thermal stress.
• Certification bodies and compliance engineers assessing long-term electrical performance at elevated temperatures.
• Designers of electrical equipment where insulation performance at high temperatures is critical (motors, generators, power electronics, high-temperature sensors).

Practical benefits:

• Enables consistent, reproducible DC testing of insulating materials at high temperatures.
• Supports material selection, failure analysis, quality assurance and comparative benchmarking using standardized volume resistance and volume resistivity data.

Related standards

• EN IEC 62631-3-1: General method for volume resistance/volume resistivity (DC methods)
• IEC 60212: Standard conditions for use prior to and during testing of solid electrical insulating materials
• IEC 62631 series: other parts covering dielectric and resistive properties

Keywords: EN IEC 62631-3-4:2019, volume resistivity, volume resistance, elevated temperatures, DC methods, insulating materials, high temperature mica, alumina ceramics, insulation resistance, test methods.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2019
Dielektrične in uporovne lastnosti trdnih izolacijskih materialov - 3-4. del:
Ugotavljanje uporovnih lastnosti (metode z enosmernim tokom) - Prehodna
upornost in specifična prehodna upornost pri povišanih temperaturah (IEC 62631-
3-4:2019)
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 (IEC 62631-3-4:2019)
Dielektrische und resistive Eigenschaften fester Isolierstoffe - Teil 3-4: Bestimmung
resistiver Eigenschaften (Gleichspannungsverfahren) - Durchgangswiderstand und
spezifischer Durchgangswiderstand bei erhöhten Temperaturen (IEC 62631-3-4:2019)
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 (IEC 62631-3-4:2019)
Ta slovenski standard je istoveten z: EN IEC 62631-3-4:2019
ICS:
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 62631-3-4

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2019
ICS 17.220.99; 29.035.01
English Version
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
(IEC 62631-3-4:2019)
Propriétés diélectriques et résistives des matériaux isolants Dielektrische und resistive Eigenschaften fester Isolierstoffe
solides - Partie 3-4: Détermination des propriétés résistives - Teil 3-4: Bestimmung resistiver Eigenschaften
(méthodes en courant continu) - Résistance transversale et (Gleichspannungsverfahren) - Durchgangswiderstand und
résistivité transversale aux températures élevées spezifischer Durchgangswiderstand bei erhöhten
(IEC 62631-3-4:2019) Temperaturen
(IEC 62631-3-4:2019)
This European Standard was approved by CENELEC on 2019-05-02. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62631-3-4:2019 E

European foreword
The text of document 112/406/CDV, future edition 1 of IEC 62631-3-4, 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 62631-3-4:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-02-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-05-02
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.

Endorsement notice
The text of the International Standard IEC 62631-3-4:2019 was approved by CENELEC as a
European Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62631-1 NOTE Harmonized as EN 62631-1

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 2010 Standard conditions for use prior to and during the EN 60212 2011
testing of solid electrical insulating materials
IEC 62631-3-1 -  Dielectric and resistive properties of solid insulating EN 62631-3-1 -
materials - Part 3-1: Determination of resistive
properties (DC methods) - Volume resistance and
volume resistivity - General method

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

IEC 62631-3-4:2019 © IEC 2019 – 3 –
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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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.
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 structure diagram and pictures
of test apparatus are added in Annex A.
h) The orders of part clauses are adjusted.
The text of this International Standard is based on the following documents:
CDV Report on voting
112/406/CDV 112/445/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 "http://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.
IEC 62631-3-4:2019 © IEC 2019 – 5 –
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

1 Scope
This part of IEC 62631 covers procedures for the determination of insulation resistance and
volume resistivity of insulating materials by applying DC-voltage and temperatures up to
800 °C. The typical application materials include high temperature mica plate and alumina
ceramics.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitute
...