IEC 61952-2008 Insulators for overhead lines - Composite line post insulators for a.c systems with a nominal voltage greater than 1000 V - Definitions test meth.pdf

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1、 IEC 61952Edition 2.0 2008-05INTERNATIONAL STANDARD NORME INTERNATIONALEInsulators 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 ri

2、gides socle pour systmes courant alternatif de tension nominale suprieure 1 000 V Dfinitions, mthodes dessai et critres dacceptation IEC61952:2008THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publicati

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17、EInsulators 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 suprieu

18、re 1 000 V Dfinitions, mthodes dessai et critres dacceptation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE UICS 29.080.10; 29.240.20 PRICE CODECODE PRIXISBN 2-8318-9784-X 2 61952 IEC:2008 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.8 2 Normative references .8 3

19、 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 10 Design tests .13 10.1 General .13

20、 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 fittings.15 10.3.1 Thermal-mechanical

21、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 mounting arrangement 17 11.2 Mechanical

22、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 Re-testing procedure.20 13 Routine

23、 tests 20 13.1 Tensile load test20 13.2 Visual examination 20 61952 IEC: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 te

24、st 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 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 acco

25、rding to lot size.19 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 CRITERIA FOREWORD 1) The International Electrotechnical

26、 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

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35、ation. 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 suc

36、h 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 edition constitutes a technical revision. This edition

37、 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 in the parameters determining the need to repeat

38、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, 61952 IEC:2008 5 additional requirements for the visual examination, removal of the annex explaining the concept of

39、 classes for design tests. The text of this standard is based on the following documents: FDIS Report on voting 36B/273/FDIS 36B/275/RVDFull 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 drafte

40、d in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged 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

41、publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 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 b

42、y 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 “design tests“, to be performed only once on insulators which satisfy the same design conditions. All the de

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

44、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 insulators are used in both a.c. and d.c. applications. In spite of this fact a specific tracking and erosio

45、n 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 for the tracking resistance of the housing material. The approach for mechanical testing under bending loa

46、ds 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 begins to occur. Annex A gives some notes on the mechanical loads and tests used in this standard. Line post i

47、nsulators 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 geometr

48、y 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 equivalent bending load or stress for design purposes. Further information is available from CIGRE 2. Compression l

49、oad 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 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 meanin