CLC/TR 62662:2011

SLOVENSKI STANDARD
01-december-2011
Navodila za proizvodnjo, preskušanje in diagnosticiranje polimernih izolatorjev
glede na krhki prelom jedrnih materialov (IEC/TR 62662:2010)
Guidance for production, testing and diagnostics of polymer insulators with respect to
brittle fracture of core materials (IEC/TR 62662:2010)
Empfehlungen und Anleitungen für die Herstellung, Prüfung und Diagnose von
Polymerisolatoren hinsichtlich Sprödbruch des Kernwerkstoffes (IEC/TR 62662:2010)
Guide pour la production, les essais et diagnostiques des isolateurs polymériques en
rapport avec les ébréchures des matériaux du noyau (CEI/TR 62662:2010)
Ta slovenski standard je istoveten z: CLC/TR 62662:2011
ICS:
29.080.10 Izolatorji Insulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 62662
RAPPORT TECHNIQUE
October 2011
TECHNISCHER BERICHT
ICS 29.080.10
English version
Guidance for production, testing and diagnostics of polymer insulators
with respect to brittle fracture of core materials
(IEC/TR 62662:2010)
Guide pour la production, les essais et Empfehlungen und Anleitungen für die
diagnostiques des isolateurs polymériques Herstellung, Prüfung und Diagnose von
en rapport avec les ébréchures des Polymerisolatoren hinsichtlich Sprödbruch
matériaux du noyau des Kernwerkstoffes
(CEI/TR 62662:2010) (IEC/TR 62662:2010)

This Technical Report was approved by CENELEC on 2011-10-24.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 62662:2011 E
Foreword
This document (CLC/TR 62662:2011) consists of the text of IEC/TR 62662:2010 prepared by IEC TC 36
"Insulators".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the Technical Report IEC/TR 62662:2010 was approved by CENELEC as a Technical Report
without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60812:2006 NOTE  Harmonized as EN 60812:2006 (not modified).

- 3 - CLC/TR 62662:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 61109 - Insulators for overhead lines - Composite EN 61109 -
suspension and tension insulators for a.c.
systems with a nominal voltage greater than
1 000 V - Definitions, test methods and
acceptance criteria
IEC/TR 62039 - Selection guide for polymeric materials for - -
outdoor use under HV stress
IEC/TR 62662 ®
Edition 1.0 2010-08
TECHNICAL
REPORT
colour
inside
Guidance for production, testing and diagnostics of polymer insulators with
respect to brittle fracture of core materials

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
Q
ICS 29.080.10 ISBN 978-2-88912-172-4
– 2 – TR 62662 © IEC:2010(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Description of brittle fracture .7
5 Identification of brittle fracture .8
6 Failure mechanisms .8
6.1 Description of identified failure mechanisms.8
6.2 Mechanism M1 – Acid generated by electrical activity .8
6.3 Mechanism M2 – Acid ingress from environment .9
6.4 Mechanism M3 – Acid generated inside the core .10
7 Risk assessment .10
7.1 FMEA approach .10
7.2 Results.11
7.3 Discussions.13
8 Guidance for material selection and production .13
8.1 Rod materials and production process.13
8.1.1 Fibreglass .13
8.1.2 Resins .14
8.1.3 Rod production .14
8.2 Housing and sealing.14
9 Preventive methods.15
9.1 Sealing.15
9.2 Corona rings .15
9.3 Material selection .16
9.4 Housing quality .16
9.5 Handling, transportation and storage.16
Bibliography.17

Figure 1 – Typical brittle fracture .

Table 1 – Risk potential number (RPN) and standardized risk potential of brittle
fracture failure modes .11
Table 2 – Risk assessment of the identified brittle fracture failure modes.11

TR 62662 © IEC:2010(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE FOR PRODUCTION, TESTING
AND DIAGNOSTICS OF POLYMER INSULATORS
WITH RESPECT TO BRITTLE FRACTURE OF CORE 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62662, which is a technical report, has been prepared by IEC technical committee 36:
Insulators.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
36/294/DTR 36/297/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.

– 4 – TR 62662 © IEC:2010(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated 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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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.
TR 62662 © IEC:2010(E) – 5 –
INTRODUCTION
There is an urgent need within utilities and industry for material standards, which define the
physical properties of the polymers applied for outdoor insulation. As a first step, a state-of-
the-art report was issued by CIGRE which led to the publication of IEC 62039. This IEC
technical report presents – as a conclusion of the CIGRE-report – the important material
properties for polymeric materials used in outdoor insulation and, where applicable, lists the
standardized test methods including the minimum requirements. The acid (brittle fracture)
resistance of FRP core materials (see 3.7) was recognized as an important property for
suspension/tension composite insulators. This technical report presents more detailed
guidance on this subject taking into account different insulator designs and produ
...