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、dsLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSINational 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 It supersedes BS EN 61952:2003 which is withdrawn.The UK participation in its prep
3、aration was entrusted to Technical CommitteePEL/36, Insulators for power systems.A list of organizations 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 6221
4、7:2005, and is used as anindicator of power arc ignition and extinction performance. The UKCommittee 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 corre
5、lationbetween performance in different flammability tests, laboratory power arctests and behaviour 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
6、are recommended to consult the power arc tests in ANSI C29.18 or IEC60099-4 surge arrestor specifications 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 provi
7、sions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 54321 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
8、StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedMarch 200931Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61952 NORME EUROPENNE EUROPISCHE NORM October 2008 CENELEC Europ
9、ean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for
10、 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 nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria (IEC 61952:2008)
11、 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 61952:2008) Isolatoren fr Freileitungen - Verbund-Freileitungssttzer fr Wechselstromsysteme mit einer
12、 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 CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
13、atus 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 any CENELEC member. This European Standard exists in three official versions (English, French, German
14、). 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 versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria,
15、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. Licensed Copy: Wang Bin,
16、ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSIEN 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 was
17、 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, t
18、ransport, 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 requirement
19、s 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 date b
20、y 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 version
21、, 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 61952:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncon
22、trolled Copy, (c) BSI- 3 - EN 61952:2008 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 appl
23、ies. 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 60383-1 - 1)Insulator
24、s for overhead lines with a nominal voltage above 1 kV - Part 1: Ceramic or glass insulator units 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 stri
25、ngs and insulator sets for a.c. systems - Definitions, test methods and acceptance criteria EN 60383-2 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
26、 ISO 3452 - 1)Non-destructive testing - Penetrant inspection - General principles - - 1)Undated reference. 2)Valid edition at date of issue. BS EN 61952:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSI 2 61952 IEC:2008 CONTENTS INTRODUCTION.6 1
27、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 Classification of tests .11 9.1 Design tests 11 9.2 Type tests .12 9.3 Sample tests .12 9.4 Routine tests .12 1
28、0 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 material .15 10.3 Product specific pre-stressing for IEC 62217 tests on interfaces and connections of end fit
29、tings.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 11 Type tests 16 11.1 Electrical tests.17 11.1.1 Vertical mounting arrangement 17 11.1.2 Horizontal mount
30、ing 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 + E2).19 12.4 Verification of the SCL (E1).19 12.4.1 Test procedure 19 12.4.2 Acceptance criteria20 12.5
31、 Re-testing procedure.20 13 Routine tests 20 13.1 Tensile load test20 13.2 Visual examination 20 BS EN 61952:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSI61952 IEC:2008 3 Annex A (informative) Notes on the mechanical loads and tests 22 Annex
32、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 Table 1 Te
33、sts 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 61952:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSI 6 61952 IEC:2
34、008 INTRODUCTION Composite line post insulators consist of a cylindrical solid insulating core, 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 emp
35、loyed by different manufacturers may be different. Some tests have been grouped together as “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
36、mechanical tests are given in this standard. As far as practical, the influence of time on the 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 sat
37、isfactory life-time under normally known stress conditions of transmission lines. Composite insulators 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
38、 000 h a.c. tracking and erosion test of IEC 62217 is used to establish a minimum requirement 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 damag
39、e limit which is the maximum stress which can be developed in the insulator before damage begins 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 lo
40、ading test to reproduce the complex loading cases in such structures is outside the scope of 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
41、 the insulators resulting from combined loads. This moment can then be equated to an equivalent 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 acti
42、ng on line post insulators are mostly combined loads. These loads will cause some deflection 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
43、 prior to the cantilever load test cannot be specified. Pollution tests, as specified in IEC 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 cor
44、relate with experience obtained from service. Specific pollution tests for non-ceramic insulators are under consideration. 1Figures in square brackets refer to the bibliography. BS EN 61952:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2009 07:16, Uncontrolled Copy, (c) BSI61952 I
45、EC: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 of the network and the supports and on the design of arc-protection devices. The heating effect of power ar
46、cs 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 properly designed arc-protection devices. This standard, however, does not exclude the possibility of a power arc t
47、est 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 standard since the RIV and corona performance are not characteristics of the insulator alone. Composite hollow core
48、 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 insulators. Torsion loads are not dealt with in this standard since they are usually negligible in the configura
49、tion 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 hybrid 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 th
