IEC 62567-2013 Overhead lines - Methods for testing self-damping characteristics of conductors《架空线路 导体自阻尼特性的试验方法》.pdf

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1、 IEC 62567 Edition 1.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Overhead lines Methods for testing self-damping characteristics of conductors Lignes lectriques ariennes Mthodes dessai des caractristiques dauto-amortissement des conducteurs IEC62567:2013 colourinsideTHIS PUBLICATION IS COP

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16、ead lines Methods for testing self-damping characteristics of conductors Lignes lectriques ariennes Mthodes dessai des caractristiques dauto-amortissement des conducteurs INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 29.060; 29.240.20 PRICE CODE CODE PRIX

17、 ISBN 978-2-8322-1056-7 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! Veuillez vous assurer que vous avez obtenu cett

18、e publication via un distributeur agr. colourinside 2 62567 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Symbols and units 8 5 Test span arrangements . 8 5.1 General . 8 5.2 Span terminations . 9 5.3 Shaker and vibration control

19、 system 10 5.4 Location of the shaker . 12 5.5 Connection between the shaker and the conductor under test . 12 5.5.1 General . 12 5.5.2 Rigid connection 13 5.5.3 Flexible connection 14 5.6 Transducers and measuring devices . 14 5.6.1 Type of transducers . 14 5.6.2 Transducer accuracy . 15 6 Conducto

20、r conditioning . 16 6.1 General . 16 6.2 Clamping . 16 6.3 Creep 16 6.4 Running-in . 16 7 Extraneous loss sources . 16 8 Test procedures . 17 8.1 Determination of span resonance 17 8.2 Power Method . 18 8.3 ISWR Method 20 8.4 Decay method . 22 8.5 Comparison between the test methods 24 8.6 Data pres

21、entation 25 Annex A (normative) Recommended test parameters . 27 Annex B (informative) Reporting recommendations 28 Annex C (informative) Correction for aerodynamic damping . 31 Annex D (informative) Correction of phase shift between transducers 33 Bibliography 34 Figure 1 Test span for conductor se

22、lf-damping measurements . 9 Figure 2 Rigid clamp 10 Figure 3 Electro-dynamic shaker 11 Figure 4 Layout of a test stand for conductor self-damping measurements . 12 Figure 5 Example of rigid connection . 13 Figure 6 Example of flexible connection . 14 Figure 7 Miniature accelerometer . 15 62567 IEC:2

23、013 3 Figure 8 Resonant condition detected by the acceleration and force signals . 18 Figure 9 Fuse wire system disconnecting a shaker from a test span; this double exposure shows the mechanism both closed and open. 23 Figure 10 A decay trace . 24 Figure B.1 Example of conductor power dissipation ch

24、aracteristics 29 Figure B.2 Example of conductor power dissipation characteristics 30 Table 1 Comparison of laboratory methods 25 Table 2 Comparison of Conductor Self-damping Empirical Parameters 26 Table C.1 Coefficients to be used with equation C-3 32 4 62567 IEC:2013 INTERNATIONAL ELECTROTECHNICA

25、L COMMISSION _ OVERHEAD LINES METHODS FOR TESTING SELF-DAMPING CHARACTERISTICS OF CONDUCTORS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IE

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35、nsable 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 such patent rights. International Standard IEC 62567 ha

36、s 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 7/629/FDIS 7/630/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in t

37、he above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62567 IEC:2013 5 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data

38、 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 indicates that it contains colours which are considered to be useful for the correct u

39、nderstanding of its contents. Users should therefore print this document using a colour printer. 6 62567 IEC:2013 INTRODUCTION Conductor self-damping is a physical characteristic of the conductor that defines its capacity to dissipate energy internally while vibrating. For conventional stranded cond

40、uctors, energy dissipation can be attributed partly to inelastic effects within the body of the wires (hysteresis damping at the molecular level) but mostly to frictional damping, due to small relative movements between overlapping individual wires, as the conductor flexes with the vibration wave sh

41、ape. Self-damping capacity is an important characteristic of the conductors for overhead transmission lines. This parameter is a principal factor in determining the response of a conductor to alternating forces induced by the wind. As the conductor self-damping is generally not specified by the manu

42、facturer, it can be determined through measurements performed on a laboratory test span. Semi-empirical methods to estimate the self-damping parameters of untested conventional stranded conductors are also available but often lead to different results. Further, a great variety of new conductor types

43、 is increasingly used on transmission lines and some of them may have self-damping characteristics and mechanisms different from the conventional stranded conductors. A “Guide on conductor self-damping measurements” was prepared jointly in the past by the IEEE Task Force on Conductor Vibration and C

44、IGRE SC22 WG01, to promote uniformity in measuring procedures. The Guide was published by IEEE as Std. 563-1978 and also by CIGRE in Electra n62-1979. Three main methods are recognized in the above documents and divided into two main categories which are usually referred to as the “forced vibration“

45、 and free vibration“ methods. The first forced vibration method is the “Power Test Method” in which the conductor is forced into resonant vibrations, at a number of tunable harmonics, and the total power dissipated by the vibrating conductor is measured at the point of attachment to the shaker. The

46、second forced vibration method, known as the “Standing Wave Method” or more precisely “Inverse Standing Wave Ratio Test Method” (ISWR), determines the power dissipation characteristics of a conductor by the measurement of antinodal and nodal amplitudes on the span, for a number of tunable harmonics.

47、 The free vibration method named “Decay Test Method” determines the power dissipation characteristics of a conductor by measuring, at a number of tunable harmonics, the decay rate of the free motion amplitude following a period of forced vibration. Several laboratories around the world have performe

48、d conductor self-damping measurements in accordance with the above mentioned Guide. However, large disparities in self-damping predictions have been found among the results supplied by the various laboratories. The causes of these disparities have been identified into five main points: 1) The differ

49、ent test methods adopted for the self-damping measurements. 2) The different span end conditions set up in the various test laboratories (rigid clamps, flexure members, etc.) 3) The different types of connection between the shaker and the conductor (rigid or flexible) and the different location of the power input point along the span. 4) The different conductor conditioning before the test (creep, running in