Fundamental characteristics of overhead transmission line galloping determined by simulating calculation using equivalent single‐conductor method

Yamaoka, Masaru; Hasegawa, Jun

doi:10.1002/eej.4391150702

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…2). However, for this analysis, the four bundles were simulated by an equivalent single conductor model [4]. The center of mass and the center of stiffness of the section of ice-encrusted transmission line do not coincide, but because the eccentric distance is much smaller than the rotation radius of the equivalent section, the eccentricity is ignored.…”

Section: Analysis Model and Analysis Methodsmentioning

confidence: 99%

Numerical analysis of overhead transmission line galloping considering wind turbulence

et al. 2000

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This study aims at clarifying the factors that cause transmission line galloping and the conditions influencing it, and at determining response evaluation indices of gallopings in turbulent flows. This is done using a three‐dimensional analytical method considering a large deformation. The analysis is based on four‐bundle transmission lines. Obtained results are as follows: The occurrence of galloping in the smooth flow is limited by the combination of the following parameters: the initial angle of wind attack, the initial icing angle, and the wind speed. The galloping predominates mainly with one or two of the lowest in‐plane, out‐of‐plane, and torsional modes for the free vibration under the conditions that the transmission line is subject to dead load as well as static wind force. However, the galloping always occurs with torsional vibration. The shape of the Lissajous figure for displacement depends on the initial angle of wind attack and the initial icing angle, as well as wind speed. The main shapes are vertically elliptic, horizontally elliptic, and a configuration having the shape of a horizontally rotated figure of eight. The predominant frequency components of gallopings in turbulent flows are amplified and controlled by the turbulence intensity. Vibration frequency components unrelated to galloping increase linearly with rise in turbulence intensity. There is a time lag of 30 s between galloping vibration and the fluctuating wind speed. The relationships between mean wind speeds and both trend components and standard deviations of galloping in turbulent flows closely correspond to those relationships during the smooth flow, and they can be obtained using the average time of 10 times the shortest vibration period of the transmission line. That is, the response values of transmission lines in the smooth flow can be utilized to estimate gallopings in turbulent flows. To estimate the maximum amplitude of a galloping, a peak factor of approximately 2.5 can be used. © 2000 Scripta Technica, Electr Eng Jpn, 131(3): 19–33, 2000

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Section: Analysis Model and Analysis Methodsmentioning

confidence: 99%

Numerical analysis of overhead transmission line galloping considering wind turbulence

et al. 2000

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“…The mechanical behaviours of bundle conductors can be represented as an equivalent single conductor (Yamaoka and Hasegawa, 1995). Additional assumptions include the following: sub-conductors of the bundle conductors are uniformly distributed along the circumferential geometry and the relative motions between the sub-conductors are neglected; the longitudinal motions of sub-conductors of bundle conductors are identical; and the spacers are rigid.…”

Section: Mathematical Modelmentioning

confidence: 99%

Effect of temperature on galloping of iced conductors

2017

Advances in Structural Engineering

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This article investigates the effect of temperature on galloping of iced conductors, accounting for the influence of sagging and geometric nonlinearity. By extending Irvine’s cable theory to thermo-elasticity problems, an analytical model is proposed to evaluate the effect of thermal stress on galloping of transmission lines. The Lindstedt–Poincare method is then used to solve the model so that the closed-form approximate solution is derived. The derived solution is then verified using numerical examples, which also displays the variation in galloping amplitude with temperature, as well as with respect to static horizontal tension, span length and wind speed. It is concluded that the thermal stress may have effects on galloping amplitude and that the temperature effects should not be neglected. Furthermore, the effect of temperature on galloping amplitude is related to static horizontal tension, span length and wind speed, and a positive temperature change does not necessarily decrease the galloping amplitude.

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Design of Galloping Monitoring System of Transmission Line Based on Inertial Sensing Unit

et al. 2020

2020 IEEE 5th International Conference on Signal and Image Processing (ICSIP)

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Fundamental characteristics of overhead transmission line galloping determined by simulating calculation using equivalent single‐conductor method

Cited by 3 publications

References 2 publications

Numerical analysis of overhead transmission line galloping considering wind turbulence

Numerical analysis of overhead transmission line galloping considering wind turbulence

Effect of temperature on galloping of iced conductors

Design of Galloping Monitoring System of Transmission Line Based on Inertial Sensing Unit

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