Five Years' Field Trials of Detuning Pendulums for Galloping Control

Havard, D.G.; Pohlman, Joe C.

doi:10.1109/tpas.1984.318231

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…Several theories have been put forward to explain the galloping mechanisms, including the Den Hartog's vertical oscillation theory [11], Nigo's coupled vertical and torsional oscillation theory [12], the coupled vertical, horizontal and torsional vibration theories, and stability criteria presented by other researchers [13][14][15]. According to these galloping mechanisms, several measures have been presented to prevent galloping, such as the detuning pendulum [16], torsional damper and Generally, the bundle conductors are equipped with spacers. The spacer firstly could prevent the collision of adjacent transmission lines, and also could reduce the Aeolian vibration and sub-span oscillation, especially for the reduction of the sub-span oscillation.…”

Section: Introductionmentioning

confidence: 99%

Galloping Reduction of Transmission Lines by Using Phononic Crystal

Han

Zhang

et al. 2017

Crystals

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Considering the combination of the transmission lines and phononic crystals (PCs), we propose a new method to solve the problem of the galloping of overhead transmission lines. The method has two key points: attaching the suitable mass-spring system on each spacer, and periodically arranging the modified spacers along a transmission line. Based on the Bloch's theorem, the PC transmission lines could generate vibration band gaps (BGs), which would reduce galloping. In order to implement our point, we establish the two-dimensional model of the PC transmission lines and derive the transfer matrix method to calculate the frequency dispersion relation of the vertical transverse vibration. Then, the extremely low frequency BG, in the range of galloping frequency, is obtained and verified based on an example of single conductor. To widen the BG range, we also study the effects of the spacer and the attached mass-spring system on the BG. The wide BG, which even covers the range of 0.338-0.909 Hz, could be given just by using the suitable setting of the spacer and mass-spring system.

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Section: Introductionmentioning

confidence: 99%

Galloping Reduction of Transmission Lines by Using Phononic Crystal

Han

Zhang

et al. 2017

Crystals

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“…Up to now, several antigalloping devices have been developed and used for transmission lines . Havard and Pohlman conducted field trials of detuning pendulums for controlling galloping of iced conductors on operating single and bundle conductor lines for 5 years and have generated considerable observational data. Keutgen et al introduced a torsional damper and detuner antigalloping device, which was validated by both laboratory tests and observations on actual 400 kV 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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“…These devices have been evaluated in field trials by many utilities worldwide. Their performance data have been accumulated to the point where these devices show a capability to control galloping [24].…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Dynamics of a power line when supported by a compliant energy absorber

Teodoro

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The governing equation iS Both ends fixed 20 Mass and spring at the left end-right end fixed 22 Mass and spring support between ends while ends are fixed Cable with support and mass-spring attached at each end CHAPTER 4. DAMPED CABLE AND DAMPED SUPPORT SYS TEM The excitation load iii A damped taut string with both ends fixed 59 Damped cable with support and both ends fixed 68 Reduction in cable response due to the support damping 72 Transient response when left span is excited by a point load at the midpoint 76 Damped cable with damped support and damped mass-spring attachment at the ends 83 Transient response at selected points when exciting left span with a point load at its midpoint 86

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Five Years' Field Trials of Detuning Pendulums for Galloping Control

Cited by 16 publications

References 5 publications

Galloping Reduction of Transmission Lines by Using Phononic Crystal

Galloping Reduction of Transmission Lines by Using Phononic Crystal

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

Dynamics of a power line when supported by a compliant energy absorber

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