IEC TS 61244-3:2005

Long-term radiation ageing in polymers - Part 3: Procedures for in-service monitoring of low-voltage cable materials

Summarizes the main cable monitoring techniques which are currently being assessed worldwide. These techniques are primarily aimed at monitoring degradation of low-voltage cables. Most of the methods are at the development stage and require more in-plant evaluation before they could be recommended as standard techniques. The advantages and disadvantages of each method, and its current state of development, are outlined in the following clauses. The main technical changes with regard to the previous edition are as follows: a) as there have been technical advances in established test methods and newer methods have become available, several additions have been made to the techniques available in Clause 5; b) some of the techniques listed in the previous edition were found to be either unsuitable for use as cable monitoring methods in plants, or less sensitive to radiation ageing than other methods; these techniques have now been removed; c) a list of abbreviations and their meanings has been added.

General Information

• Status: Withdrawn
• Publication Date: 15-Nov-2005
• Withdrawal Date: 30-Dec-2013
• ICS: 17.240 - Radiation measurements
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 112 - Evaluation and qualification of electrical insulating materials and systems
• Drafting Committee: WG 2 - TC 112/WG 2
• Current Stage: WPUB - Publication withdrawn
• Completion Date: 31-Dec-2013

Relations

• Revises: IEC TS 61244-3:1998 - Long-term radiation ageing in polymers - Part 3: Procedures for in-service monitoring of low-voltage cable materials
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TECHNICAL IEC
SPECIFICATION TS 61244-3
Second edition
2005-11
Long-term radiation ageing in polymers –
Part 3:
Procedures for in-service monitoring
of low-voltage cable materials

Reference number
IEC/TS 61244-3:2005(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to
search by a variety of criteria including text searches, technical committees
and date of publication. On-line information is also available on recently issued
publications, withdrawn and replaced publications, as well as corrigenda.
• IEC Just Published
This summary of recently issued publications (www.iec.ch/online_news/ justpub)
is also available by email. Please contact the Customer Service Centre (see
below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:

Email: [e-mail]
Tel: [phone]
Fax: [phone]
TECHNICAL IEC
SPECIFICATION TS 61244-3
Second edition
2005-11
Long-term radiation ageing in polymers –
Part 3:
Procedures for in-service monitoring
of low-voltage cable materials

 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale U

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – TS 61244-3  IEC:2005(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Abbreviations .7
4 Requirements of a monitoring technique.8
5 Techniques available.8
5.1 General .8
5.2 Local tests without sampling.9
5.3 Local tests with micro-sampling.11
6 Summary.14

Bibliography.28

Figure 1 – Schematic diagram showing the operating principles of the sonic velocity
meter [1] .16
Figure 2 – Sonic velocity test results [3].17
Figure 3 – Variation in IR absorbance with wavelength for PVC material and the use of
first derivative to eliminate baseline shifts [1].18
Figure 4 – Correlation of first derivative of IR absorbance at 1 640 nm to 1 650 nm and
elongation at break for thermal ageing of PVC at 110 °C [1] .19
Figure 5 – Schematic diagram and photographs of prototype torque tester .20
Figure 6 – Elongation at break versus torque value for flame-retardant PVC cables
thermally aged at 158 °C [5] .21
Figure 7 – Elongation at break versus torque value for PVC cables exposed to
sequential radiation ageing to 0,5 MGy and thermal ageing at 120 °C [5].21
Figure 8 – Elongation at break versus torque value for PVC cables thermally aged at
120 °C [5] .22
Figure 9 – Correlation of tensile elongation with modulus measurements made using
the modulus profiling apparatus for a CSPE jacket aged at the five indicated
temperatures [6] .22
Figure 10 – Correlation of tensile elongation with modulus measurements made using
the modulus profiling apparatus for a CP jacket aged at the three indicated
temperatures (from Reference [8]) .23
Figure 11 – Correlation of tensile elongation with modulus measurements made using
the modulus profiling apparatus for a CSPE jacket aged at the four indicated combined
environments [9] .23
Figure 12 – Correlation of tensile elongation with NMR relaxation time measurements
for a CP jacket aged at the three indicated temperatures (from Reference [8]).24
Figure 13 – Correlation of tensile elongation with NMR relaxation time measurements
for a XLPO insulation aged at the two indicated temperatures [12].24
Figure 14 – Carbonyl absorbance as a function of the radiation dose for XLPE [15].25

TS 61244-3  IEC:2005(E) – 3 –
Figure 15 – Carbonyl absorbance as a function of thermal ageing for XLPE [14].25
Figure 16 – Correlation of tensile elongation with solvent uptake factor for a CP jacket
aged at the three indicated temperatures [8] .26
Figure 17 – Elongation results compared to uptake and gel results for XLPE insulation
aged at 130 °C [18].26
Figure 18 – Elongation results compared to uptake and gel results for an XLPO
insulation aged at 125 °C [18].27

Table 1 – Summary of currently available techniques for cable condition monitoring.15

– 4 – TS 61244-3  IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
LONG-TERM RADIATION AGEING IN POLYMERS –

Part 3: Procedures for in-service monitoring
of low-voltage cable materials

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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) 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.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 61244-3, which is a technical specification, was prepared by subcommittee 15E: Methods
of test, of IEC technical committee 15: Insulating materials, which has now been merged with
IEC technical committee 98: Electrical insulation systems into IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems (provisional title).

TS 61244-3  IEC:2005(E) – 5 –
This second edition cancels and replaces the first edition, published in 1998, and constitutes
a technical revision. The main technical changes with regard to the previous edition are as
follows:
a) as there have been technical advances in established test methods and newer methods
have become available, several additions have been made to the techniques available in
Clause 5;
b) some of the techniques listed in the previous edition were found to be either unsuitable for
use as cable monitoring methods in plants, or less sensitive to radiation ageing than other
methods; these techniques have now been removed;
c) a list of abbreviations and their meanings has been added.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
15E/252/DTS 15E/258/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61244 consists of the following parts, under the general title Long-term radiation ageing
in polymers:
Part 1 Techniques for monitoring diffusion-limited oxidation
Part 2: Procedures for predicting ageing at low dose rates
Part 3: Procedures for in-service monitoring of low-voltage cable materials
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result dateindicated on the IEC web site under "http://webstore.iec.ch" in the
data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – TS 61244-3  IEC:2005(E)
INTRODUCTION
Polymers are widely used as e
...