Wind and Structures

  • 제11권4호
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  • Pages.303-321
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  • 2008
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Galloping analysis of stranded electricity conductors in skew winds

  • Macdonald, J.H.G. (Department of Civil Engineering, University of Bristol, Queen's Building, University Walk) ;
  • Griffiths, P.J. (Department of Civil Engineering, University of Bristol, Queen's Building, University Walk) ;
  • Curry, B.P. (Department of Civil Engineering, University of Bristol, Queen's Building, University Walk)
  • 투고 : 2007.02.20
  • 심사 : 2008.06.23
  • 발행 : 2008.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

When first commissioned, the 1.6 km span 275kV Severn Crossing Conductor experienced large amplitude vibrations in certain wind conditions, but without ice or rain, leading to flashover between the conductor phases. Wind tunnel tests undertaken at the time identified a major factor was the lift generated in the critical Reynolds number range in skew winds. Despite this insight, and although a practical solution was found by wrapping the cable to change the aerodynamic profile, there remained some uncertainty as to the detailed excitation mechanism. Recent work to address the problem of dry inclined cable galloping on cable-stayed bridges has led to a generalised quasi-steady galloping formulation, including effects of the 3D geometry and changes in the static force coefficients in the critical Reynolds number range. This generalised formulation has been applied to the case of the Severn Crossing Conductor, using data of the static drag and lift coefficients on a section of the stranded cable, from the original wind tunnel tests. Time history analysis has then been used to calculate the amplitudes of steady state vibrations for comparison with the full scale observations. Good agreement has been obtained between the analysis and the site observations, giving increased confidence in the applicability of the generalised galloping formulation and providing insight into the mechanism of galloping of yawed and stranded cables. Application to other cable geometries is also discussed.

키워드

참고문헌

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피인용 문헌

  1. The response of an overhead electrical power transmission line to two types of wind forcing vol.100, pp.1, 2012, https://doi.org/10.1016/j.jweia.2011.10.005
  2. Review on dynamic and quasi-static buffeting response of transmission lines under synoptic and non-synoptic winds vol.112, 2016, https://doi.org/10.1016/j.engstruct.2016.01.003
  3. Aerodynamics of nominally circular cylinders: A review of experimental results for Civil Engineering applications vol.137, 2017, https://doi.org/10.1016/j.engstruct.2017.01.023
  4. Misconceptions and Generalizations of the Den Hartog Galloping Criterion vol.140, pp.4, 2014, https://doi.org/10.1061/(ASCE)EM.1943-7889.0000697
  5. Galloping of an elliptical cylinder at the critical Reynolds number and its quasi-steady prediction vol.168, 2017, https://doi.org/10.1016/j.jweia.2017.04.022
  6. A quasi-steady 3 degree-of-freedom model for the determination of the onset of bluff body galloping instability vol.27, pp.7, 2011, https://doi.org/10.1016/j.jfluidstructs.2011.04.006
  7. Full Scale Experiment for Vibration Analysis of Ice-Coated Bundled-Conductor Transmission Lines vol.26, pp.1, 2022, https://doi.org/10.1007/s12205-021-0814-2