1、 IEC 62568 Edition 1.0 2015-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Overhead lines Method for fatigue testing of conductors Lignes ariennes Mthode dessai de fatigue des conducteurs IEC 62568:2015-07(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switz
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19、us avez des questions contactez-nous: csciec.ch. IEC 62568 Edition 1.0 2015-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Overhead lines Method for fatigue testing of conductors Lignes ariennes Mthode dessai de fatigue des conducteurs INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECH
20、NIQUE INTERNATIONALE ICS 29.060, 29.240.20 ISBN 978-2-8322-2778-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuil
21、lez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 62568:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Terms and definitions 6 3 Symbols and abbreviated terms . 7 4 Requirements 7 5 Test method 7 5.1 Test set-up . 7 5.1.1 General .
22、 7 5.1.2 Clamp 7 5.1.3 Length of bench . 7 5.1.4 Conductor tension . 7 5.1.5 Sinusoidal excitation 8 5.1.6 Excitation frequency 8 5.2 Test parameters for resonance type benches 8 5.3 Termination of a test . 8 5.4 Number of tests 8 6 Test results . 9 Annex A (informative) Fatigue testing of conductor
23、s 10 A.1 Background. 10 A.2 Confirmation . 11 A.3 Present knowledge of fatigue endurance capability of conductors . 11 A.4 Important characteristics related to conductor fatigue . 11 A.5 Test details . 12 A.5.1 Typical test benches for fatigue tests of conductors . 12 A.5.2 Typical configuration rec
24、ommended . 12 A.6 Failure detection . 12 A.7 Collection of data base results 13 A.7.1 Simple analytical representation of fatigue phenomenon 13 A.7.2 Idealized stress . 14 A.8 Use of results 15 A.9 Type of clamps . 15 A.10 Performance comparison 15 Bibliography 16 Figure 1 Schematic representation o
25、f a resonance-type test bench 8 Figure A.1 Schematic representation of a typical resonance fatigue test bench 12 Figure A.2 Conductor supported in a typical short metallic clamp . 13 Figure A.3 Bending model of a conductor supported in a metallic clamp, cantilever beam in a square face block . 13 Fi
26、gure A.4 Free loop amplitude y max. 14 IEC 62568:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OVERHEAD LINES METHOD FOR FATIGUE TESTING OF CONDUCTORS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
27、 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 Sp
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36、 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 ident
37、ifying any or all such patent rights. International Standard IEC 62568 has been prepared by IEC technical committee 7: Overhead electrical conductors. The text of this standard is based on the following documents: FDIS Report on voting 7/638/FDIS 7/640/RVD Full information on the voting for the appr
38、oval 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. 4 IEC 62568:2015 IEC 2015 The committee has decided that the contents of this publication will remain unchanged until the stab
39、ility date indicated on the IEC website 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. IMPORTANT The colour inside logo on the cover page of this publication indic
40、ates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. IEC 62568:2015 IEC 2015 5 INTRODUCTION Fatigue behaviour of conductors cannot simply be calculated from the fatigue charac
41、teristics of the materials used and the stresses that occur. Fatigue characteristics of conductors must be determined by fatigue tests conducted on specific conductor/clamp systems reproducing as closely as possible the field loading conditions. In such tests, the fatigue life must be determined as
42、a function of some measure of vibration intensity rather than of the stress or stress combination that causes the failure. Fatigue test data are available for only a small fraction of the conductor sizes and types that are in use, and such data are expensive to acquire. Since none of the above param
43、eters is simply related to the fatigue-initiating stresses, results from tests on one conductor size are not necessarily applicable to others. This IEC Standard is based on these considerations and others explained in Annex A. The user of this standard is encouraged to consult this annex in order to
44、 understand the origin of some of the requirements herein. 6 IEC 62568:2015 IEC 2015 OVERHEAD LINES METHOD FOR FATIGUE TESTING OF CONDUCTORS 1 Scope This International Standard provides test procedures to measure the fatigue characteristics of conductor/clamp systems. For the purposes of this standa
45、rd, clamps shall be of the metallic type only. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 antinode amplitude mid-loop single peak vibration amplitude 2.2 bending amplitude peak-to-peak vibration amplitude of conductor with respect to the
46、 clamp, measured 89 mm from the last point of contact between the conductor and the clamp 2.3 failure criterion benchmark at which the test is deemed terminated. Note 1 to entry: Two different failure criteria may be chosen: a) failure of the first wire, or b) failure of three wires or of 10% of the
47、 total number of envelope wires for composite conductors, or of the total number of wires for homogeneous conductors 2.4 idealized bending stress alternating stress amplitude calculated based on the measured bending amplitude 2.5 idealized dynamic stress alternating stress amplitude calculated based
48、 on the measured fy maxproduct 2.6 idealized strain computed dynamic bending alternating strain obtained by dividing the idealised stress by the Youngs modulus of the outer layer material Note 1 to entry: This calculated idealized strain does not correspond to the strain measured on given wires at t
49、he exit of the clamp 2.7 resonance fatigue test cyclic motion imposed on a conductor in a vertical plane at a resonant frequency of the system IEC 62568:2015 IEC 2015 7 3 Symbols and abbreviated terms f frequency (Hz) i occurrence of wire failure (first = 1, second = 2, third = 3 ) N number of cycles of vibration N inumber of cycles corresponding to wire failure i Mc million cycle T conductor mechanical tension Y bbe
