SIST EN 62621:2016
(Main)Railway applications - Fixed installations - Electric traction - Specific requirements for composite insulators used for overhead contact line systems
Railway applications - Fixed installations - Electric traction - Specific requirements for composite insulators used for overhead contact line systems
This International Standard specifies characteristics for composite insulators of electric traction
overhead contact line systems for railways, as defined in IEC 60913. Insulators specified in this
standard are applied for electric traction supply voltages with a nominal voltage greater than
1 000 V for a.c. or a nominal voltage greater than 1 500 V for d.c.. Specific applications where
high torsional loads can occur are outside the scope of this standard and particular tests are
agreed between the supplier and customer to represent the critical loading arrangements.
This International Standard applies to composite insulators as defined in 3.1 below and not to
other polymeric insulators.
The provisions contained in this standard are intended for the design and construction of new
electric traction overhead contact line systems using insulators, or when complete
refurbishment of existing overhead contact line systems takes place.
This standard provides the purchaser and manufacturer with a range of tests which are used to
evaluate the suitability of an insulator product for a given railway environment. Additional tests
may be specified by the client to measure the compliance of the insulator under particular
operating conditions.
The standard establishes the product characteristics, the test methods and acceptance criteria.
The object of this standard is to stipulate the provisions for the design and provision of the
service indicated by the manufacturer to the customer or informed buyer for application on the
railway infrastructure.
Bahnanwendungen - Ortsfeste Anlagen - Zugförderung - Besondere Anforderungen an Verbundisolatoren für Oberleitungssysteme
Applications ferroviaires - Installations fixes - Traction électrique - Exigences particulières pour les isolateurs composites destinés aux réseaux de lignes aériennes de contact
La CEI 62621:2011 spécifie les caractéristiques des isolateurs composites destinés aux réseaux de lignes aériennes de contact de traction électrique ferroviaire, selon la définition de la CEI 60913. Les isolateurs spécifiés par la présente norme sont conçus pour les réseaux d'alimentation de traction électrique dont les tensions nominales sont supérieures à 1 000 V en courant alternatif ou 1 500 V en courant continu. La présente norme établit les caractéristiques de produit, les méthodes d'essai et les critères d'acceptation.
Železniške naprave - Stabilne naprave električne vleke - Posebne zahteve za kompozitne izolatorje za vozne vode omrežij
Ta mednarodni standard določa značilnosti kompozitnih izolatorjev sistemov kontaktnega vodnika za nadzemno električno vleko pri železnicah, kot je opredeljeno v standardu IEC 60913. Izolatorji, določeni v tem standardu, se uporabljajo pri napajalnih napetostih električne vleke z nazivno napetostjo več kot 1000 V pri izmeničnem toku ali z nazivno napetostjo več kot 1500 V pri enosmernem toku. Posebni načini uporabe, kjer lahko pride do visokih vrtilnih obremenitev, niso zajeti v tem standardu; dobavitelj in odjemalec se dogovorita o posameznih preskusih glede predstavitve ureditev s kritično obremenitvijo.
Ta mednarodni standard se uporablja za kompozitne izolatorje, kot je opredeljeno v spodnji točki 3.1, in ne za druge polimerne izolatorje.
Določbe v tem standardu so namenjene za zasnovo in izdelavo novih sistemov kontaktnega vodnika za nadzemno električno vleko z izolatorji ali za popolno obnovo obstoječih voznih vodov omrežij.
Ta standard podaja za kupca in proizvajalca številne preskuse, ki se uporabljajo za ocenjevanje primernosti izolatorjev za dano železniško okolje. Odjemalec lahko določi dodatne preskuse za izmero skladnosti izolatorja v določenih pogojih delovanja.
Standard določa karakteristike izdelka, preskusne metode in prevzemne kriterije. Cilj tega standarda je določiti določbe za zasnovo in zagotavljanje storitve, ki jih proizvajalec navede za kupca za namene uporabe v železniški infrastrukturi.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bahnanwendungen - Ortsfeste Anlagen - Zugförderung - Besondere Anforderungen an Verbundisolatoren für OberleitungssystemeApplications ferroviaires - Installations fixes - Traction électrique - Exigences particulières pour les isolateurs composites destinés aux réseaux de lignes aériennes de contactRailway applications - Fixed installations - Electric traction - Specific requirements for composite insulators used for overhead contact line systems29.280Electric traction equipment29.080.10IzolatorjiInsulatorsICS:Ta slovenski standard je istoveten z:EN 62621:2016SIST EN 62621:2016en01-julij-2016SIST EN 62621:2016SLOVENSKI
STANDARDSIST EN 50151:20041DGRPHãþD
SIST EN 62621:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 62621
February 2016 ICS 45.060
Supersedes
EN 50151:2003
English Version
Railway applications - Fixed installations - Electric traction - Specific requirements for composite insulators used for overhead contact line systems (IEC 62621:2011)
Applications ferroviaires - Installations fixes - Traction électrique - Exigences particulières pour les isolateurs composites destinés aux réseaux de lignes aériennes de contact (IEC 62621:2011)
Bahnanwendungen - Ortsfeste Anlagen - Zugförderung - Besondere Anforderungen an Verbundisolatoren für Oberleitungssysteme (IEC 62621:2011) This European Standard was approved by CENELEC on 2015-12-21. 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, 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: Avenue Marnix 17,
B-1000 Brussels © 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62621:2016 E SIST EN 62621:2016
EN 62621:2016 2 Foreword This document (EN 62621:2016) consists of the text of IEC 62621:2011 prepared by IEC/TC 9 "Electrical equipment and systems for railways". The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-12-21 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-12-21
This document supersedes EN 50151:2003.
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. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this document. Endorsement notice The text of the International Standard IEC 62621:2011 was approved by CENELEC as a European Standard without any modification. SIST EN 62621:2016
EN 62621:2016 3 Annex ZA (normative)
Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When 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 60587 -
Electrical insulating materials used under severe ambient conditions - Test methods for evaluating resistance to tracking and erosion EN 60587 -
IEC/TS 60815-1 2008
Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 1: Definitions, information and general principles - -
IEC/TS 60815-3 2008
Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 3: Polymer insulators for a.c. systems - -
IEC 60826 -
Design criteria of overhead transmission lines - -
IEC 60850 2007 1) Railway applications - Supply voltages of traction systems EN 50163 2004 - - + corr. May 2010 - - + AC
2013 - - + A1 2007 IEC 60913 -
Railway applications - Fixed installations - Electric traction overhead contact lines EN 50119 - IEC 61109 2008
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 EN 61109 2008
1) IEC 60850:2007 is replaced by IEC 60850:2014, Railway applications - Supply voltages of traction systems. SIST EN 62621:2016
EN 62621:2016 4 Publication Year Title EN/HD Year IEC 61467 2008
Insulators for overhead lines - Insulator strings and sets for lines with a nominal voltage greater than 1 000 V - AC power arc tests EN 61467 2008
IEC 61952 2008
Insulators for overhead lines - Composite line post insulators for A.C. systems with a nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria EN 61952 2008
IEC 62217 2005 2) Polymeric insulators for indoor and outdoor use with a nominal voltage > 1 000 V - General definitions, test methods and acceptance criteria EN 62217 2006 3) - -
+ corr. December 2006
IEC 62497-1 2010
Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances and creepage distances for all electrical and electronic equipment EN 50124-1 2001 - - + corr. December 2007 - - + corr. May 2010 - - + A1 2003 - - + A2 2005 ISO 34-1 -
Rubber, vulcanized or thermoplastic - Determination of tear strength - Part 1: Trouser, angle and crescent test pieces - -
ISO 37 -
Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties - -
2) IEC 62217:2005 is replaced by IEC 62217:2012, Polymeric HV insulators for indoor and outdoor use - General definitions, test methods and acceptance criteria. 3) EN 62217:2006 is replaced by EN 62217:2013, Polymeric HV insulators for indoor and outdoor use - General definitions, test methods and acceptance criteria (IEC 62217:2012). SIST EN 62621:2016
EN 62621:2016 5 Annex ZZ (informative)
Correspondence between this European Standard and the Essential Requirements of EU Directive 2008/57/EC This European Standard has been prepared under a mandate given to CENELEC by the European Union and the European Free Trade Association and within its scope the standard covers all relevant essential requirements as given in Annex lll of the EU Directive 2008/57/EC (also named as New Approach Directive 2008/57/EC Rail Systems: Interoperability). Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations. WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard. SIST EN 62621:2016
SIST EN 62621:2016
IEC 62621 Edition 1.0 2011-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Railway applications – Fixed installations – Electric traction – Specific requirements for composite insulators used for overhead contact line systems
Applications ferroviaires – Installations fixes – Traction électrique – Exigences particulières pour les isolateurs composites destinés aux réseaux de lignes aériennes de contact
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 45.060 PRICE CODE CODE PRIX ISBN 978-2-88912-569-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
SIST EN 62621:2016
– 2 – 62621 © IEC:2011 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references. 6 3 Terms and definitions . 7 4 Characteristics of composite insulators for overhead contact line systems . 8 4.1 General . 8 4.2 Environmental conditions . 8 4.3 System voltages and frequencies . 9 4.4 Creepage distance . 9 4.5 Mechanical requirements . 10 4.6 Corrosion . 11 4.7 Fire safety . 11 4.8 Tracking and erosion . 11 4.9 Arc protection . 11 4.10 In-running insulators . 12 5 Testing . 12 5.1 General . 12 5.2 Design tests . 12 5.3 Type tests . 14 5.3.1 General . 14 5.3.2 Electrical tests . 14 5.3.3 Mechanical tests . 14 5.3.4 Verification of dimensions . 14 5.4 Sample tests . 15 5.5 Routine tests . 15 6 Identification . 15 7 Transport, storage, installation and maintenance . 15 Annex A (informative)
Purchaser requirements . 16 Annex B (informative)
Principles of the damage limit, load coordination and testing . 17 Annex C (informative)
Guidance on non-standard mechanical stresses and dynamic mechanical loading . 21 Annex D (informative)
Determination of the equivalent bending moment caused by combined loads . 23 Bibliography . 26
cigure=B.N=−=ioad-time strength and damage limit of a core assembled with fittings . 18 Figure B.2 – Graphical representation of the relationship of the damage limit to the mechanical characteristics and service loads of an insulator with a 16 mm diameter core . 19 Figure B.3 – Test loads . 20 Figure D.1 – Combined loads applied to unbraced insulators . 24
Table 1 – Definition of relevant mechanical characteristics according to insulator type . 10 Table 2 – Design tests . 13
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fNqboNAqflNAi=bibCqolqbCeNfCAi=CljjfppflN ____________
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
ELECTRIC TRACTION –
SPECIFIC REQUIREMENTS FOR COMPOSITE INSULATORS
USED FOR OVERHEAD CONTACT LINE SYSTEMS
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. International Standard IEC 62621 has been prepared by IEC technical committee 9: Electrical equipment and systems for railways. This standard is based on EN 50151:2003. The text of this standard is based on the following documents: FDIS Report on voting 9/1539/FDIS 9/1560/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. SIST EN 62621:2016
– 4 – 62621 © IEC:2011 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.
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INTRODUCTION This standard specifies requirements for the design and testing of composite insulators used on railway electric traction overhead contact line systems. Such insulators, which are installed at relatively low heights in the harsh environment of railway infrastructures, require specific considerations during design to reduce the effects of vandalism and environmental pollution from railway operations, especially when combined with a lack of natural washing. Insulators may be included in arrangements in tunnels and over bridges or be in contact with traction unit pantographs where combined mechanical loading (tension, bending and torsion) may require special consideration. The standard is intended to allow the manufacturer to comply with local working practices, to ensure compatibility with existing electric traction overhead contact line systems, and provide an insulator which will give reliable service over its target life span with minimum maintenance. Insulators intended for overhead lines are predominately designed to resist tension and/or bending loads and are not designed to resist torsional loads. Mitigating measures to reduce torsional loading are generally introduced by the overhead contact lines design engineer. Some combined loading (tension, compression and torsion) can be experienced and this is represented in the testing procedure specified in this document. The testing procedures given for railway applications in this standard are predominately referenced from IEC 61109, IEC 61952 and IEC 62217. SIST EN 62621:2016
– 6 – 62621 © IEC:2011 RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
ELECTRIC TRACTION –
SPECIFIC REQUIREMENTS FOR COMPOSITE INSULATORS
USED FOR OVERHEAD CONTACT LINE SYSTEMS
1 Scope This International Standard specifies characteristics for composite insulators of electric traction overhead contact line systems for railways, as defined in IEC 60913. Insulators specified in this standard are applied for electric traction supply voltages with a nominal voltage greater than 1 000 V for a.c. or a nominal voltage greater than 1 500 V for d.c. Specific applications where high torsional loads can occur are outside the scope of this standard and particular tests are agreed between the supplier and customer to represent the critical loading arrangements. This International Standard applies to composite insulators as defined in 3.1 below and not to other polymeric insulators. The provisions contained in this standard are intended for the design and construction of new electric traction overhead contact line systems using insulators, or when complete refurbishment of existing overhead contact line systems takes place. This standard provides the purchaser and manufacturer with a range of tests which are used to evaluate the suitability of an insulator product for a given railway environment. Additional tests may be specified by the client to measure the compliance of the insulator under particular operating conditions. The standard establishes the product characteristics, the test methods and acceptance criteria. The object of this standard is to stipulate the provisions for the design and provision of the service indicated by the manufacturer to the customer or informed buyer for application on the railway infrastructure. 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 latest edition of the referenced document (including any amendments) applies. IEC 60587, Electrical insulating materials used under severe ambient conditions – Test methods for evaluating resistance to tracking and erosion IEC 60815-1:2008, Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 1: Definitions, information and general principles IEC 60815-3:2008, Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 3: Polymer insulators for a.c. systems IEC 60826, Design criteria of overhead transmission lines IEC 60850:2007, Railway applications – Supply voltages of traction systems SIST EN 62621:2016
62621 © IEC:2011 – 7 –
IEC 60913, Electric traction overhead lines IEC 61109:2008, 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 61467:2008, Insulators for overhead lines – Insulator strings and sets for lines with a nominal voltage greater than 1 000 V – AC power arc tests IEC 61952:2008, Insulators for overhead lines – Composite line post insulators for A.C. systems with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria IEC 62217:2005, Polymeric insulators for indoor and outdoor use with a nominal voltage
> 1 000 V – General definitions, test methods and acceptance criteria IEC 62497-1:2010, Railway applications – Insulation cordination – Part 1: Basic requirements Clearances and creepage distances for all electrical and electronic equipment ISO 34-1, Rubber, vulcanized or thermoplastic- determination of tear strength – Part 1: Trouser, angle and crescent test pieces ISO 37, Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties 3 Terms and definitions For the purposes of this document, the following terms and definitions apply.
NOTE Certain terms from IEC 62217:2005 are reproduced here for ease of reference. Additional definitions applicable to insulators can be found in IEC 60050-471[1]1, IEC 61109:2008 and IEC 61952:2008. 3.1
composite insulator insulator made of at least two insulating parts, namely a core and a housing equipped with end fittings NOTE Composite insulator, for example, can consist either of individual sheds mounted on the core, with or without an intermediate sheath, or alternatively, of a housing directly moulded or cast in one or several pieces on to the core. 3.2
nominal design load load, specified by the customer, corresponding to the normal everyday permanent and dynamic loads ___________ 1
Figures in square brackets refer to the bibliography.
SIST EN 62621:2016
– 8 – 62621 © IEC:2011 4 Characteristics of composite insulators for overhead contact line systems 4.1 General Composite materials and polymers permit the manufacture of insulators for use on outdoor overhead contact line systems. The insulators consist of an insulating core which bears the mechanical load, a polymeric housing which protects the core, and end fittings by which the load is transmitted to the core. These materials allow special applications in overhead contact line systems (including in-running section insulation and flexible supports) and are also used for their advantages of lightness, resistance to vandalism and pollution performance. Despite many common features of design, the materials used and the construction details employed by different manufacturers may be quite different and may lead to different performance parameters. Electric traction overhead contact line systems applied for railways have several characteristics not associated with power lines. They are of low height and run through urban areas, making them targets for vandalism. They are incorporated in bridges and tunnels, built for rolling stock only, and fit into small spaces. They suffer close proximity to railway generated pollution and, in tunnels and bridges are not washed by natural rainfall. They suffer movement and snatch loads due to normal pantograph contact with the wires. When used as in-running insulators, they suffer mechanical forces and abrasion by the pantograph passing at high speed where the polymeric housing may suffer deformation, tearing and parting from the core (see 4.10). Some tests have been grouped together in this standard as “design tests”, to be performed only once on insulators which satisfy the same design conditions. As far as practical, the influence of time, circumstance and climate on electrical and mechanical properties of the components (core material, housing, interfaces etc.) and of the complete composite insulators has been considered in specifying the design tests so that a satisfactory life-time may be expected under normally known stress conditions of overhead contact line systems. The high number of insulators installed in a restricted environment of an operational railway with limited access for maintenance or installed in harsh environmental conditions, requires a high level of reliability at the appropriate electrical insulation level for the system voltage, including temporary and transient overvoltages, and a high level of mechanical integrity. In this case, a reasonable safety factor for mechanical and electrical properties of the insulators shall be agreed between the manufacturer and customer.
4.2 Environmental conditions Environmental conditions such as temperature, humidity, vibration, solar radiation, pollution, etc., can have serious effects on the electrical and mechanical properties of insulators. The aging of housing material and interfaces, exposure of the core to environment and the corrosion of end fittings shall be given special consideration. When used for lower temperature, the behaviour or brittle property of the housing material and interfaces shall be considered.
NOTE When temperature falls below the crystallisation or glass transition temperature of the housing, its elasticity becomes lost. This change is reversible if a temperature increase takes place.
The normal environmental conditions to which insulators are submitted in service are defined in IEC 62217:2005. Since the insulators are intended for outdoor use and may be installed in harsh environmental conditions, pollution shall be considered. The pollution degrees are defined in Table A.4 of IEC 62497-1:2010.
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62621 © IEC:2011 – 9 –
4.3 System voltages and frequencies System voltages and frequencies specified by IEC 60850:2007 are generally applied for this standard. Values of standard system voltages (phase to ground) and the correlation between nominal voltages of the railway power distribution system and the required insulation voltages for circuits of equipment which are intended to be connected to these systems are shown in Table 1 of IEC 60850:2007. The purchaser shall provide information on the railway electrification system and operating requirements which may affect the design of insulators.
NOTE Purchaser requirements are given in Annex A. The dry lightning impulse withstand voltage shall be at least equal to the rated impulse voltage defined in IEC 62497-1:2010. The wet power frequency withstand voltage shall be at least equal to the short duration power frequency test level defined in IEC 62497-1:2010. The rated impulse voltage for circuits powered by electric traction contact lines are shown in Table A.2 of IEC 62497-1:2010. Overhead lines are considered a case of inherent control. The rated insulation level is based on statistical and risk considerations. There
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