1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationGuidance for production, testing and diagnostics of polymer insulators with respect to brittle fracture of core materialsPD CLC/TR 62662:2011National forewordThis Published Docum
2、ent is the UK implementation of CLC/TR 62662:2011. The UK participation in its preparation was entrusted to Technical Committee PEL/36, Insulators for power systems.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to
3、include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 75926 0 ICS 29.080.10This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 November 2010.Amendments and corrigenda i
4、ssued since publicationDate Text affectedPUBLISHED DOCUMENTPD CLC/TR 62662:201131 December 2011 This corrigendum renumbers PD IEC/TR 62662:2010as PD CLC/TR 62662:2011It supersedes PD IEC/TR 62662:2010, which is withdrawn.TECHNICAL REPORT CLC/TR 62662 RAPPORT TECHNIQUE TECHNISCHER BERICHT October 201
5、1 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved wo
6、rldwide for CENELEC members. Ref. No. CLC/TR 62662:2011 E 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 diagnostiques des isolateurs p
7、olymriques en rapport avec les brchures des matriaux du noyau (CEI/TR 62662:2010) Empfehlungen und Anleitungen fr die Herstellung, Prfung und Diagnose von Polymerisolatoren hinsichtlich Sprdbruch des Kernwerkstoffes (IEC/TR 62662:2010) This Technical Report was approved by CENELEC on 2011-10-24. CEN
8、ELEC 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
9、, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 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 pat
10、ent 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. PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 2 Annex
11、 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 editio
12、n 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 suspension and te
13、nsion insulators for a.c. systems with a nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria EN 61109 - IEC/TR 62039 - Selection guide for polymeric materials for outdoor use under HV stress - - PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 3 4 IEC/TR 62662Edition 1
14、.0 2010-08TECHNICAL REPORT Guidance for production, testing and diagnostics of polymer insulators with respect to brittle fracture of core materials INTERNATIONAL ELECTROTECHNICAL COMMISSION QICS 29.080.10 PRICE CODEISBN 978-2-88912-172-4 Registered trademark of the International Electrotechnical Co
15、mmission colourinsideCONTENTS FOREWORD.7INTRODUCTION.9 1 Scope.10 2 Normative references .10 3 Terms and definitions .10 4 Description of brittle fracture 11 5 Identification of brittle fracture 12 6 Failure mechanisms .12 6.1 Description of identified failure mechanisms12 6.2 Mechanism M1 Acid gene
16、rated by electrical activity .12 6.3 Mechanism M2 Acid ingress from environment .13 6.4 Mechanism M3 Acid generated inside the core .147 Risk assessment 14 7.1 FMEA approach 14 7.2 Results15 7.3 Discussions.17 8 Guidance for material selection and production 17 8.1 Rod materials and production proce
17、ss.17 8.1.1 Fibreglass .178.1.2 Resins .18 8.1.3 Rod production 18 8.2 Housing and sealing189 Preventive methods19 9.1 Sealing19 9.2 Corona rings .19 9.3 Material selection 20 9.4 Housing quality .209.5 Handling, transportation and storage.20 Bibliography21Figure 1 Typical brittle fracture 11 Table
18、1 Risk potential number (RPN) and standardized risk potential of brittle fracture failure modes .15Table 2 Risk assessment of the identified brittle fracture failure modes15 PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 6 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ GUIDANCE FOR PRODUCTION, TESTING AND
19、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
20、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 Gui
21、des (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
22、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 po
23、ssible, 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.
24、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 underta
25、ke 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 attest
26、ation 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
27、 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
28、 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 f
29、or 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 i
30、s 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 re
31、port, 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
32、 indicated in the above table. PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 7 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 sit
33、e 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 cov
34、er 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. PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 8 INTRODUCTION There is an urgent need within
35、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 CIGR
36、E-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
37、for suspension/tension composite insulators. This technical report presents more detailed guidance on this subject taking into account different insulator designs and production techniques. The risk of occurrence and the influencing parameters were evaluated by failure mode effect analysis (FMEA). B
38、rittle fracture is not the only failure mechanism for insulators in service and is generally less frequently observed than other modes, such as failure due to tracking and erosion. However, this subject is not yet covered by any IEC test procedures specifically designed to detect or prevent brittle
39、fracture. PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 9 GUIDANCE FOR PRODUCTION, TESTING AND DIAGNOSTICS OF POLYMER INSULATORS WITH RESPECT TO BRITTLE FRACTURE OF CORE MATERIALS 1 Scope This technical report presents an analysis of the risk of influencing factors for brittle fracture of composite ins
40、ulators that are mostly loaded in the tensile mode (suspension and tension insulators). Guidance is given to reduce the risk of in-service brittle fractures. This phenomenon is limited to tension and suspension insulators. However, the general information given concerning the importance of various p
41、arameters can be used as a guideline for the design and production of any kind of composite insulator. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the l
42、atest edition of the referenced document (including any amendments) applies: IEC 61109, Insulators for overhead lines Composite 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 gu
43、ide for polymeric materials for outdoor use under HV stress 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 fibre reinforced plastic material FRP composite material consisting of reinforcing components e.g. glass or synthetic fibres that are
44、embedded in a polymer matrix e.g. epoxy or polyester. The FRP core is the integral load-carrying part of a composite insulator 3.2 stress corrosion cracking SCC failure of material subjected to a constant tensile stress in a corrosive environment 3.3 brittle fracture abnormal and sudden breakage of
45、FRP core materials with well-defined characteristic fracture patterns NOTE Before brittle fracture, no apparent plastic deformation takes place. In the case of FRP core materials, brittle fracture is caused by SCC. 3.4 failure mechanism principal and fundamental process that leads to a characteristi
46、c failure, e.g. brittle fracture PD CLC/TR 62662:2011 CLC/TR 62662:2011 (E) 10 NOTE A failure mechanism may have several modes of final failure. 3.5 failure mode specific failure scenario or optional path of a failure mechanism 3.6 sealing system technical arrangement to prevent the ingress of moist
47、ure, gases, etc., at a material transition point exposed to the environment 3.7 failure mode effect analysis FMEA standardized risk assessment tool generally used for failure prevention 3.8 damage degradation of a component leading to penetration by acid or moisture 4 Description of brittle fracture
48、 Brittle fracture is the commonly used term for stress corrosion-induced failure of insulator core rods manufactured from resin bonded glass fibre material (RBGF, commonly known as fibre reinforced plastic FRP). This failure mechanism results in a complete mechanical separation of the core (normally
49、 near the energized end fitting), and can occur at tensile loads well below the rated mechanical strength of the insulators. In addition to a (minimum) tensile stress of approximately 50 MPa, the brittle fracture mechanism requires the presence of acid from either external or internal sources. The chemical process of stress corrosion is an ion exchange mechanism whereby ions in the glass fibres are replaced by hydrogen ions from the acid (see IEC/TR 62039). Figure 1 Typical brittle fracture IEC
