IEC 60544-5:2022

IEC 60544-5 ®
Edition 3.0 2022-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical insulating materials – Determination of the effects of ionizing
radiation –
Part 5: Procedures for assessment of ageing in service

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IEC 60544-5 ®
Edition 3.0 2022-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical insulating materials – Determination of the effects of ionizing
radiation –
Part 5: Procedures for assessment of ageing in service
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.240; 29.035.01 ISBN 978-2-8322-3936-0

– 2 – IEC 60544-5:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope and object . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 7
4 Background . 7
4.1 General . 8
4.2 Diffusion-limited oxidation (DLO). 8
4.3 Dose rate effects (DRE) . 9
4.4 Accelerated radiation ageing . 9
4.5 Accelerated thermal ageing . 10
5 Approaches to ageing assessment . 10
6 Identifying components of concern . 10
6.1 General . 10
6.2 Priorities for ageing management . 10
6.3 Environmental monitoring . 11
6.4 Localized severe environments . 11
6.5 Worst case components . 11
7 Condition monitoring techniques . 11
7.1 General . 11
7.2 Establishing correlation curves for CM methods . 12
7.3 CM methods . 12
7.4 Using CM for short-term troubleshooting . 13
7.5 Using CM for long-term degradation assessment . 16
8 Predictive modelling . 17
9 Sample deposit . 18
9.1 General . 18
9.2 Requirements of a deposit . 18
9.3 Pre-ageing samples for a deposit . 18
9.4 Installation of a sample deposit . 19
9.5 Testing of samples from the deposit . 19
9.6 Determination of sampling intervals . 19
9.7 Real time aged materials . 20
Annex A (informative) Example of a CM correlation curve . 21
Annex B (informative) Use of a deposit . 22
B.1 Typical sample in a deposit . 22
B.2 Typical testing schedule for a deposit . 22
Bibliography . 23

Figure 1 – Development of ageing data on changes in tensile elongation and a
condition indicator (e.g. indenter modulus) – Schematic representation . 15
Figure 2 – Correlation curve derived from data in Figure 1 – Schematic representation . 16
Figure 3 – Estimation of elongation from a correlation curve . 17

Figure 4 – Modification of sampling interval dependent on values of the CM indicator –
Schematic representation . 20
Figure A.1 – Correlation curve for indenter modulus against tensile elongation for a

CSPE cable jacket material [24] . 21

– 4 – IEC 60544-5:2022 RLV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
DETERMINATION OF THE EFFECTS OF IONIZING RADIATION –

Part 5: Procedures for assessment of ageing in service

FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60544-5:2011. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 60544-5 has been prepared by IEC technical committee TC 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 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) added recent references in 7.4 showing that some electrical condition monitoring methods
show promising correlations with ageing;
b) updated recommendations for implementation of a sample deposit in 9.2, installation of a
sample deposit in 9.3 and testing of samples from the deposit in 9.4;
c) updated list of references.
The text of this International Standard is based on the following documents:
Draft Report on voting
112/523/CDV 112/553/RVC
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 60544 series, published under the general title Electrical insulating
materials – Determination of the effects of ionizing radiation, 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 rev
...