Field Observations on Wind-Induced Conductor Motions

Hardy, C.; Dyke, P. Van

doi:10.1006/jfls.1995.1003

Cited by 21 publications

(10 citation statements)

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“…References [11], [12] determined the forces acting at the spacer clamp and developed a mathematical model for vortexinduced vibrations in bundled conductors with spacer dampers. The severity of wake-induced oscillations of bundled conductors was examined on a full-scale experimental line in [13]. In the present study, a finite element model of spacers is constructed and is integrated to the model of one span of an overhead transmission line with bundled conductors as discussed in the subsequent section.…”

Section: Bundled Conductors With Spacersmentioning

confidence: 99%

Vibration of Bundled Conductors Following Ice Shedding

Kollár

Farzaneh

2008

IEEE Trans. Power Delivery

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Section: Bundled Conductors With Spacersmentioning

confidence: 99%

Vibration of Bundled Conductors Following Ice Shedding

Kollár

Farzaneh

2008

IEEE Trans. Power Delivery

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“…N s is a constant known as the Strouhal number and takes a typical value in the order of 0.185 for OHL conductors . For a flexibly mounted conductor span in a steady wind, these effects can result in an oscillatory motion.…”

Section: Wind‐induced Conductor Motionsmentioning

confidence: 99%

“…The amplitude of vibration experienced by a conductor in a cross flow is minimal, however, until the Strouhal frequency closely matches a natural mode of the conductor. The nth order natural modes of overhead conductors can be found using equation , where T is the tension (N), w is the mass per unit length (kg m −1 ), l is the span length of the conductor (m) and n is the modal order such that n = 1 gives the fundamental frequency of the conductor . Typical values for the fundamental frequency of conductor lines are discussed in Annex 1.3 but tend to be of very low magnitude in the order of 0.1–0.3 Hz for HV transmission lines .…”

Section: Wind‐induced Conductor Motionsmentioning

confidence: 99%

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Effect of wind turbine wakes on wind‐induced motions in wood‐pole overhead lines

et al. 2014

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Wood-pole overhead conductor lines are known to be subject to different wind-induced motions, some which lead to conductor fatigue over long periods and others that can cause severe damage over short, isolated incidences. These lines are often located in rural areas, and, with the ever increasing deployment of onshore wind farms, the potential impact of the wind turbine wakes on these conductor motions is a matter of interest. Discussion of the potential effects of conductor fatigue on wood-pole overhead conductor lines is important as this could impact the planning, modelling and siting of onshore wind farms. This paper presents a literature analysis of both the mechanism by which different conductor motions are excited and wind turbine wake characteristics with specific interest at low levels akin to wood-pole height. The archival value of this paper is that experimental data from an active wind farm, at wood-pole overhead line heights, is analysed and discussed for the first time, and the results show that wake effects at these heights are likely to be minimal. However, turbulent buffeting in particular is cited as a problem of interest, and the potential effects on wood-pole motions are outlined.

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“…In existing guidelines or standards, the wind load is still the key load during the design of a transmission tower and line. According to the causes and characteristics of transmission line vibration induced by the wind load, the conductor vibration can be divided into four types: the aeolian vibration, subspan oscillation, conductor galloping, and fluctuating vibration . These vibration types can lead to fatigue, abrasion, and even break of conductor and its metal fittings, which will greatly threaten the safe operation of transmission lines.…”

Section: Introductionmentioning

confidence: 99%

A pounding spacer damper and its application on transmission line subjected to fluctuating wind load

et al. 2016

Struct. Control Health Monit.

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In this paper, a new pounding spacer damper (PSD) is proposed, and the control effect on the transmission line under the fluctuating wind load is validated. At first, the schematic of the proposed PSD is provided, and the mechanical models of elastic, damping, and pounding forces are then obtained. After that, the dynamic equations of transmission line equipped with the PSD are derived. On the basis, the finite element model of transmission line-PSD system with the ANSYS software is established, and the pounding force of the PSD is calculated and applied through the ANSYS Parametric Design Language. Then the response induced by the fluctuating wind load is simulated, and meanwhile, the control effects of the PSD and spacer damper without pounding force are compared, of which the results illustrate that the minimal reduction ratio for the conductor span can reach to 11.10%, indicating that the proposed PSD can effectively control the vibration of the conductor span under the fluctuating wind load. In addition, the parametric analysis of gap, frequency, and damping ratios is conducted and demonstrates that the gap and frequency ratio have great impact on the control effect while the influence of damping ratio is not very significant.

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Field Observations on Wind-Induced Conductor Motions

Cited by 21 publications

References 0 publications

Vibration of Bundled Conductors Following Ice Shedding

Vibration of Bundled Conductors Following Ice Shedding

Effect of wind turbine wakes on wind‐induced motions in wood‐pole overhead lines

A pounding spacer damper and its application on transmission line subjected to fluctuating wind load

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