1、Insulators for overhead lines Composite line post insulatorsfor A.C. systems with a nominalvoltage greater than 1 000 V Definitions, test methods andacceptance criteriaBS EN 61952:2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British Standar
2、dsNational forewordThis British Standard is the UK implementation of EN 61952:2008. It is identical to IEC 61952:2008. It supersedes BS EN 61952:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteePEL/36, Insulators for power systems.A list of organiza
3、tions represented on this committee can be obtained onrequest to its secretary.The attention of users is drawn to the flammability test in Tables 1 and 2 ofBS EN 61952:2008, which references BS EN 62217:2005, and is used as anindicator of power arc ignition and extinction performance. The UKCommitte
4、e is of the opinion that work carried out before and after BS EN62217:2005 was published shows that the flammability test is not suitablefor assessing the power arc performance of insulators. The correlationbetween performance in different flammability tests, laboratory power arctests and behaviour
5、in service is currently under investigation by theInternational Council on Large Electric Systems study committee on Materialsand Emerging Technologies (CIGRE SC D1). When applying this standard,users are recommended to consult the power arc tests in ANSI C29.18 or IEC60099-4 surge arrestor specific
6、ations in addition to the test in Tables 1 and 2.The ANSI test also usefully includes an end fitting seal test after power arcdamage.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 54321
7、 0ICS 29.080.10; 29.240.20BRITISH STANDARDBS EN 61952:2008Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text aff
8、ectedMarch 200931EUROPEAN STANDARD EN 61952 NORME EUROPENNE EUROPISCHE NORM October 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050
9、Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61952:2008 E ICS 29.080.10; 29.240.20 Supersedes EN 61952:2003English version Insulators for overhead lines - Composite line post insulators for A.C. systems with a nom
10、inal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria (IEC 61952:2008) Isolateurs pour lignes ariennes - Isolateurs composites rigides socle pour systmes courant alternatif de tension nominale suprieure 1 000 V - Dfinitions, mthodes dessai et critres dacceptation (CEI
11、 61952:2008) Isolatoren fr Freileitungen - Verbund-Freileitungssttzer fr Wechselstromsysteme mit einer Nennspannung ber 1 000 V - Begriffe, Prfverfahren und Annahmekriterien (IEC 61952:2008) This European Standard was approved by CENELEC on 2008-09-01. CENELEC members are bound to comply with the CE
12、N/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 Central Secretariat or to
13、 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 Central Secretariat has the same status as the official
14、versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Rom
15、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61952:2008 - 2 - Foreword The text of document 36B/273/FDIS, future edition 2 of IEC 61952, prepared by SC 36B, Insulators for overhead lines, of IEC TC 36, Insulators, was submitted to the IEC-CENELEC parallel vote and
16、was approved by CENELEC as EN 61952 on 2008-09-01. This standard supersedes EN 61952:2003. EN 61952:2008 includes the following significant technical changes with respect to EN 61952:2003: removal of tests procedures now given in EN 62217, inclusion of clauses on tolerances, environmental conditions
17、, transport, storage and installation, changes in the parameters determining the need to repeat design and type tests, clarification of the mounting arrangements for electrical type tests, modification of the specification of load application in bending tests to simplify testing, additional requirem
18、ents for the visual examination, removal of the annex explaining the concept of classes for design tests. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-06-01 latest dat
19、e by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-09-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61952:2008 was approved by CENELEC as a European Standard without any modification. In the official vers
20、ion, for Bibliography, the following notes have to be added for the standards indicated: IEC 60507 NOTE Harmonized as EN 60507:1993 (not modified). IEC 61462 NOTE Harmonized as EN 61462:2007 (not modified). _ BS EN 61952:2008- 3 - EN 61952:2008 Annex ZA (normative) Normative references to internatio
21、nal 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 amendm
22、ents) 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 60383-1 - 1)Insulators for overhead lines with a nominal voltage above 1 kV - Part 1: Ceramic or glass insulator unit
23、s for a.c. systems - Definitions, test methods and acceptance criteria EN 60383-1 + A11 1996 2)1999 IEC 60383-2 - 1)Insulators for overhead lines with a nominal voltage above 1 kV - Part 2: Insulator strings and insulator sets for a.c. systems - Definitions, test methods and acceptance criteria EN 6
24、0383-2 1995 2)IEC 62217 - 1)Polymeric insulators for indoor and outdoor use with a nominal voltage 1 000 V - General definitions, test methods and acceptance criteria EN 62217 + corr. December 2006 2)2006 ISO 3452 - 1)Non-destructive testing - Penetrant inspection - General principles - - 1)Undated
25、reference. 2)Valid edition at date of issue. BS EN 61952:2008 2 61952 IEC:2008 CONTENTS INTRODUCTION.6 1 Scope.8 2 Normative references .8 3 Terms and definitions .8 4 Abbreviations .10 5 Identification.10 6 Environmental conditions11 7 Transport, storage and installation11 8 Tolerances .11 9 Classi
26、fication of tests .11 9.1 Design tests 11 9.2 Type tests .12 9.3 Sample tests .12 9.4 Routine tests .12 10 Design tests .13 10.1 General .13 10.2 Test specimens for IEC 62217.14 10.2.1 Tests on interfaces and connections of end fittings14 10.2.2 Tracking and erosion test 14 10.2.3 Tests on core mate
27、rial .15 10.3 Product specific pre-stressing for IEC 62217 tests on interfaces and connections of end fittings.15 10.3.1 Thermal-mechanical pre-stressing .15 10.4 Assembled core load tests.15 10.4.1 Test for the verification of the maximum design cantilever load (MDCL)15 10.4.2 Tensile load test 16
28、11 Type tests 16 11.1 Electrical tests.17 11.1.1 Vertical mounting arrangement 17 11.1.2 Horizontal mounting arrangement 17 11.2 Mechanical tests .18 11.2.1 Cantilever failing load test .18 12 Sample tests 19 12.1 General rules 19 12.2 Verification of dimensions (E1 + E2)19 12.3 Galvanizing test (E1
29、 + E2).19 12.4 Verification of the SCL (E1).19 12.4.1 Test procedure 19 12.4.2 Acceptance criteria20 12.5 Re-testing procedure.20 13 Routine tests 20 13.1 Tensile load test20 13.2 Visual examination 20 BS EN 61952:200861952 IEC:2008 3 Annex A (informative) Notes on the mechanical loads and tests 22
30、Annex B (informative) Determination of the equivalent bending moment caused by combined loads.24 Bibliography27 Figure 1 Thermal-mechanical pre-stressing test Typical cycles .21 Figure B.1 Combined loads applied to unbraced insulators 25 Figure B.2 Combined loads applied to braced insulators 26 Tabl
31、e 1 Tests to be carried out after design changes .13 Table 2 Design tests 14 Table 3 Mounting arrangements for electrical tests 17 Table 4 Sample sizes according to lot size.19 BS EN 61952:2008 6 61952 IEC:2008 INTRODUCTION Composite line post insulators consist of a cylindrical solid insulating cor
32、e, bearing the mechanical load, protected by a polymeric housing, the loads being transmitted to the core by metal fittings. Despite these common features, the materials used and the construction details employed by different manufacturers may be different. Some tests have been grouped together as “
33、design tests“, to be performed only once on insulators which satisfy the same design conditions. All the design tests defined in IEC 62217 are applied for composite line post insulators; additional specific mechanical tests are given in this standard. As far as practical, the influence of time on th
34、e 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 to ensure a satisfactory life-time under normally known stress conditions of transmission lines. Composite i
35、nsulators are used in both a.c. and d.c. applications. In spite of this fact a specific tracking and erosion test procedure for d.c. applications as a design test has not yet been defined and accepted. The 1 000 h a.c. tracking and erosion test of IEC 62217 is used to establish a minimum requirement
36、 for the tracking resistance of the housing material. The approach for mechanical testing under bending loads used in this standard is based on the work of CIGRE 11. This approach uses the concept of a damage limit which is the maximum stress which can be developed in the insulator before damage beg
37、ins to occur. Annex A gives some notes on the mechanical loads and tests used in this standard. Line post insulators are often used in braced structures whose geometry varies from line to line. A combined loading test to reproduce the complex loading cases in such structures is outside the scope of
38、this standard and it would be very difficult to specify a general test which covers the majority of geometry and loading cases. In order to give some guidance, Annex B explains how to calculate the moment in the insulators resulting from combined loads. This moment can then be equated to an equivale
39、nt bending load or stress for design purposes. Further information is available from CIGRE 2. Compression load tests are not specified in this standard. The mechanical loads expected from service stress acting on line post insulators are mostly combined loads. These loads will cause some deflection
40、on the insulator. Compression loads applied on pre-deflected insulators will lead to results largely dependent on the pre-deflection. Therefore a pure compression test has little meaning since the deflection prior to the cantilever load test cannot be specified. Pollution tests, as specified in IEC
41、60507 3, are not included in this standard, their applicability to composite line post insulators not having been proven. Such pollution tests performed on insulators made of non-ceramic materials do not correlate with experience obtained from service. Specific pollution tests for non-ceramic insula
42、tors are under consideration. 1Figures in square brackets refer to the bibliography. BS EN 61952:200861952 IEC:2008 7 It has not been considered useful to specify a power arc test as a mandatory test. The test parameters are manifold and can have very different values depending on the configurations
43、 of the network and the supports and on the design of arc-protection devices. The heating effect of power arcs should be considered in the design of metal fittings. Critical damage to the metal fittings, resulting from the magnitude and duration of the short-circuit current can be avoided by properl
44、y designed arc-protection devices. This standard, however, does not exclude the possibility of a power arc test by agreement between the user and manufacturer. IEC 61467 4 gives details of a.c. power arc testing of insulator sets. Radio interference and corona tests are not specified in this standar
45、d since the RIV and corona performance are not characteristics of the insulator alone. Composite hollow core line post insulators are currently not dealt with in this standard. IEC 61462 5 gives details of tests on hollow core composite insulators, many of which can be applied to such line post insu
46、lators. Torsion loads are not dealt with in this standard since they are usually negligible in the configuration in which line post insulators are generally used. Specific applications where high torsion loads can occur are outside the scope of this standard. The application of this standard to hybr
47、id line post insulators (e.g. those having a core made of a material other than resin impregnated fibres) has not been fully studied. For example, in general the load-time mechanical tests and tests for core material are not applicable to porcelain cores. It is therefore recommended that this standa
48、rd be considered as a provisional standard for hybrid line post insulators, using an agreed selection of tests from this standard and from IEC 60383-1. Wherever possible, IEC Guide 111 6 has been followed for the drafting of this standard. BS EN 61952:2008 8 61952 IEC:2008 INSULATORS FOR OVERHEAD LI
49、NES COMPOSITE LINE POST INSULATORS FOR A.C. SYSTEMS WITH A NOMINAL VOLTAGE GREATER THAN 1 000 V DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA 1 Scope This International Standard applies to composite line post insulators consisting of a load-bearing cylindrical insulating solid core consisting of fibres usually glass in a resin-based matrix, a housing (outside the insulating core) made of polymeric material and end fittings permanentl
