EN 62567-2013 en Overhead lines - Methods for testing self-damping characteristics of conductors.pdf

1、BSI Standards PublicationOverhead lines Methods for testing self-damping characteristics of conductorsBS EN 62567:2013National forewordThis British Standard is the UK implementation of EN 62567:2013. It is identical to IEC 62567:2013.The UK participation in its preparation was entrusted to Technical

2、Committee GEL/7, Overhead electrical conductors.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Stan

3、dards Institution 2013.Published by BSI Standards Limited 2013ISBN 978 0 580 61689 1ICS 29.060.01; 29.240.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 Dece

4、mber 2013.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62567:2013EUROPEAN STANDARD EN 62567 NORME EUROPENNE EUROPISCHE NORM November 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisch

5、es Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62567:2013 E ICS 29.060; 29.240.20 English version Overhead lines - Me

6、thods for testing self-damping characteristics of conductors (IEC 62567:2013) Lignes lectriques ariennes - Mthodes dessai des caractristiques dauto-amortissement des conducteurs (CEI 62567:2013) Freileitungen - Methoden zur Prfung der Eigendmpfungseigenschaften von Leitern (IEC 62567:2013) This Euro

7、pean Standard was approved by CENELEC on 2013-10-17. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical reference

8、s concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN

9、ELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugosla

10、v Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 62567:2013EN 62567:2013 - 2 - Foreword Th

11、e text of document 7/629/FDIS, future edition 1 of IEC 62567, prepared by IEC/TC 7 “Overhead electrical conductors“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62567:2013. The following dates are fixed: latest date by which the document has to be implemented at natio

12、nal level by publication of an identical national standard or by endorsement (dop) 2014-07-17 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-10-17 Attention is drawn to the possibility that some of the elements of this document may be the su

13、bject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62567:2013 was approved by CENELEC as a European Standard without any modification. BS EN 62567:2013- 3 - EN 62567:201

14、3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited a

15、pplies. 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 60050-466 1990 Int

16、ernational electrotechnical vocabulary (IEV) - Chapter 466: Overhead lines - - IEEE Std. 563 1978 IEEE Guide on conductor self-damping measurements - - IEEE Std. 664 1993 IEEE Guide for laboratory measurement of the power dissipation characteristics of aeolian vibration dampers for single conductors

17、 - - BS EN 62567:2013 2 62567 IEC:2013 CONTENTS 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 system 10 5.4 Location of the shaker . 12

18、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 Conductor conditioning . 16 6.1 General . 16 6.2 Cl

19、amping . 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 presentation 25 Annex A (normative) Recommended

20、 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 self-damping measurements . 9 Figure 2 Rigid

21、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 BS EN 62567:201362567 IEC:2013 3 Figure 8 Resonant con

22、dition 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 characteristics 29 Figure B.2

23、 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 BS EN 62567:2013 6 62567 IEC:2013 INTRODUCTION Conductor self-damping is

24、a physical characteristic of the conductor that defines its capacity to dissipate energy internally while vibrating. For conventional stranded conductors, energy dissipation can be attributed partly to inelastic effects within the body of the wires (hysteresis damping at the molecular level) but mos

25、tly to frictional damping, due to small relative movements between overlapping individual wires, as the conductor flexes with the vibration wave shape. Self-damping capacity is an important characteristic of the conductors for overhead transmission lines. This parameter is a principal factor in dete

26、rmining the response of a conductor to alternating forces induced by the wind. As the conductor self-damping is generally not specified by the manufacturer, it can be determined through measurements performed on a laboratory test span. Semi-empirical methods to estimate the self-damping parameters o

27、f untested conventional stranded conductors are also available but often lead to different results. Further, a great variety of new conductor types is increasingly used on transmission lines and some of them may have self-damping characteristics and mechanisms different from the conventional strande

28、d conductors. A “Guide on conductor self-damping measurements” was prepared jointly in the past by the IEEE Task Force on Conductor Vibration and CIGRE 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. Th

29、ree main methods are recognized in the above documents and divided into two main categories which are usually referred to as the “forced vibration“ and free vibration“ methods. The first forced vibration method is the “Power Test Method” in which the conductor is forced into resonant vibrations, at

30、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 second forced vibration method, known as the “Standing Wave Method” or more precisely “Inverse Standing Wave Ratio Test Method” (ISWR), determines the po

31、wer dissipation characteristics of a conductor by the measurement of antinodal and nodal amplitudes on the span, for a number of tunable harmonics. The free vibration method named “Decay Test Method” determines the power dissipation characteristics of a conductor by measuring, at a number of tunable

32、 harmonics, the decay rate of the free motion amplitude following a period of forced vibration. Several laboratories around the world have performed conductor self-damping measurements in accordance with the above mentioned Guide. However, large disparities in self-damping predictions have been foun

33、d among the results supplied by the various laboratories. The causes of these disparities have been identified into five main points: 1) The different test methods adopted for the self-damping measurements. 2) The different span end conditions set up in the various test laboratories (rigid clamps, f

34、lexure 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, etc.) 5) The different manufacturing pro

35、cesses of the conductor. BS EN 62567:201362567 IEC:2013 7 OVERHEAD LINES METHODS FOR TESTING SELF-DAMPING CHARACTERISTICS OF CONDUCTORS 1 Scope The scope of this Standard is to provide test procedures based on the above-mentioned documents and devoted to minimize the causes of discrepancy between te

36、st results, taking into consideration the large experience accumulated in the last 30 years by numerous test engineers and available in literature, including a CIGRE Technical Brochure specifically referring to this standard (see Bibliography). This Standard describes the current methodologies, incl

37、uding apparatus, procedures and accuracies, for the measurement of conductor self-damping and for the data reduction formats. In addition, some basic guidance is also provided to inform the potential user of a given methods strengths and weaknesses. The methodologies and procedures incorporated in t

38、his Standard are applicable only to testing on indoor laboratory spans. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated refere

39、nces, the latest edition of the referenced document (including any amendments) applies. IEC 60050-466:1990, International Electrotechnical Vocabulary. Chapter 466: Overhead lines IEEE Std. 563-1978, IEEE Guide on conductor self-damping measurements IEEE Std. 664-1993, IEEE Guide for laboratory measu

40、rement of the power dissipation characteristics of aeolian vibration dampers for single conductors 3 Terms and definitions For the purpose of this International Standard, the definitions of the International Electrotechnical Vocabulary (IEV) apply, in particular IEC 60050-466. Those which differ or

41、do not appear in the IEV are given below. 3.1 conductor self-damping: the self-damping of a conductor subjected to a tensile load T is defined by the power Pcdissipated per unit length by the conductor vibrating in a natural mode, with a loop length /2, an antinode displacement amplitude Y0and a fre

42、quency f 3.2 node in a vibrating conductor, nodes are the points in which the vibration amplitude is the smallest 3.3 anti-node in a vibrating conductor, anti-nodes are the points in which the vibration amplitude is the greatest BS EN 62567:2013 8 62567 IEC:2013 4 Symbols and units A forcing point t

43、ransverse acceleration, single amplitude m/s2anvibration amplitude at the nthnode mm D,d diameter of the conductor m logarithmic decrement Edisstotal energy dissipated by the vibrating conductor Joule Ekintotal kinetic energy of the vibrating conductor Joule F single amplitude exciting force N f vib

44、ration frequency Hz h non dimensional viscous damping coefficient L free length of the test span m wavelength m /2 loop length m m conductor mass per unit length kg/m n number of vibrating loops in the span ncnumber of vibration cycles nkjnumber of loops between loop k and loop j P power dissipated

45、by the conductor mW Pcpower dissipated by the conductor per unit length mW/m Pjpower dissipated by the conductor, measured at loop j mW Pkpower dissipated by the conductor, measured at loop k mW aphase angle between force and acceleration deg dphase angle between force and displacement deg v phase a

46、ngle between force and velocity deg SjInverse standing wave ratio (ISWR) at loop j SkInverse standing wave ratio (ISWR) at loop k SnInverse standing wave ratio (ISWR) at the nthloop T conductor tension N V forcing point transverse velocity, single amplitude m/s Vnvibration velocity at the nthantinod

47、e peak value m/s circular frequency rad Yasingle antinode amplitude at the first decay cyclemm Yfvibration single amplitude at the driving point mm Ynvibration single amplitude at the nthantinode mm Yovibration single amplitude at antinode mm Yzsingle antinode amplitude at the last decay cycle mm ch

48、aracteristic impedance of the conductor N s/m 5 Test span arrangements 5.1 General The laboratory test spans for conductor self-damping measurements are generally built indoor in still air areas where the variation of ambient temperature is minimal or can be suitably controlled. Ambient temperature

49、variations up to 0,2 C/h are considered acceptable. TmBS EN 62567:201362567 IEC:2013 9 The free span length L should preferably be at least ten times longer than the longest loop length used in the tests. For consistent results, a span length greater than 40m is recommended but satisfactory results can be obtained with spans in the range of 30m. For shorter spans, the influence of the termination losses and the distribution of the tensile load between the co