SANS 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.pdf

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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21799-0 SANS 61952:2008 Edition 2 IEC 61952:2008 Edition 2SOUTH AFRICAN NATIONAL STANDARD Insulators for overhead lines Composite line pos

4、t insulators for A.C. systems with a nominal voltage greater than 1 000 V Definitions, test methods and acceptance criteria This national standard is the identical implementation of IEC 61952:2008 and is adopted with the permission of the International Electrotechnical Commission. Published by SABS

5、Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 61952:2008 Edition 2 IEC 61952:2008 Edition 2 Tabl

6、e of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 67D, Electricity distribution systems and components Insulators, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreeme

7、nt. This SANS document was published in September 2008. This SANS document supersedes SANS 61952:2003 (edition 1). This standard may only be used and printed by approved subscription and freemailing clients of the SABS. IEC 61952 Edition 2.0 2008-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Insula

8、tors 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 Isolateurs pour lignes ariennes Isolateurs composites rigides socle pour systmes courant alternatif de tension nominale suprieure 1 00

9、0 V Dfinitions, mthodes dessai et critres dacceptation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 29.080.10; 29.240.20 PRICE CODE CODE PRIX ISBN 2-8318-9784-XSANS 61952:2008This standard may only be used and printed by approved subscription and freemai

10、ling clients of the SABS. 2 61952 IEC:2008 CONTENTS FOREWORD.4 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 Classification of tests .11 9.1

11、 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 material.15 10.3 Product speci

12、fic 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 test16 11 Type tests 16 11.1 Electri

13、cal tests.17 11.1.1 Vertical mounting arrangement 17 11.1.2 Horizontal mounting arrangement17 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

14、 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 SANS 61952:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.61952 IEC

15、:2008 3 Annex A (informative) Notes on the mechanical loads and tests 22 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 ins

16、ulators 25 Figure B.2 Combined loads applied to braced insulators 26 Table 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 SANS 61952:2008This standard may only be used and

17、printed by approved subscription and freemailing clients of the SABS. 4 61952 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ 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 CRITER

18、IA 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

19、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 entruste

20、d 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 Internati

21、onal 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

22、 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

23、 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 thei

24、r 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declare

25、d to be in conformity with an IEC Publication. 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 C

26、ommittees 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 draw

27、n 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

28、be held responsible for identifying any or all such patent rights. International Standard IEC 61952 has been prepared by subcommittee 36B: Insulators for overhead lines, of IEC technical committee 36: Insulators. This second edition cancels and replaces the first edition published in 2002. This edit

29、ion constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: removal of tests procedures now given in IEC 62217, inclusion of clauses on tolerances, environmental conditions, transport, storage and installation, changes

30、 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, SANS 61952:2008This standard may only be used and printed by appr

31、oved subscription and freemailing clients of the SABS.61952 IEC:2008 5 additional requirements for the visual examination, removal of the annex explaining the concept of classes for design tests. The text of this standard is based on the following documents: FDIS Report on voting 36B/273/FDIS 36B/27

32、5/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. 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 u

33、nchanged until the maintenance result 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. SANS 61952:2008This standard may only be us

34、ed and printed by approved subscription and freemailing clients of the SABS. 6 61952 IEC:2008 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 fi

35、ttings. 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 “design tests“, to be performed only once on insulators which satisfy the same design conditions. All the design tests

36、 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 the electrical and mechanical properties of the components (core material, housing, interfaces, etc.) and of the comple

37、te 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 insulators are used in both a.c. and d.c. applications. In spite of this fact a specific tracking and erosion test pro

38、cedure 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 for the tracking resistance of the housing material. The approach for mechanical testing under bending loads used in

39、 this standard is based on the work of CIGRE 1 1 . This approach uses the concept of a damage 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 insulator

40、s 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 this standard and it would be very difficult to specify a general test which covers the majority of geometry and lo

41、ading 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 equivalent bending load or stress for design purposes. Further information is available from CIGRE 2. Compression load test

42、s 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 on the insulator. Compression loads applied on pre-deflected insulators will lead to results largely dependent on t

43、he 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 60507 3, are not included in this standard, their applicability to composite line post insulators not having been p

44、roven. 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 insulators are under consideration. 1Figures in square brackets refer to the bibliography. SANS 61952:2008This standard m

45、ay only be used and printed by approved subscription and freemailing clients of the SABS.61952 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 of the netw

46、ork 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 properly designed a

47、rc-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 standard since the

48、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 insulators. Tors

49、ion 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 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