Galloping Stability and Wind Tunnel Test of Iced Quad Bundled Conductors considering Wake Effect

Liu, Xiaohui; Zou, Ming; Wu, Chuan; Cai, Mengqi; Min, Guangyun

doi:10.1155/2020/8885648

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Different ice types will cause aerodynamic differences. When the temperature is low (−8 °C ~−11 °C) and the rainfall is low (Liu et al, 2020b), the typical crescent-shape ice is easy to form because the small water droplets coagulate upon contact with the conductor surface. When the temperature is high and the rainfall is high, the water droplets cannot reach the contact point when they reach the surface of the conductor.…”

Section: Effect Of Ice Shape On Gallopingmentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

et al. 2022

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In this article, the numerical model of the multi-span iced eight-bundle conductor is established using the nonlinear finite element method, the galloping of the line under different parameters is simulated, and the tension in the galloping process is analyzed. Based on the aerodynamic characteristics and galloping characteristics of conductors, the galloping modes, frequency characteristics, vibration amplitudes, and galloping orbits of multi-span lines under different wind velocities, span lengths, ice shape, and number of spans are analyzed, compared with those of single-span lines. It is demonstrated that there are differences in galloping characteristics between multi-span transmission lines and single-span lines. Each span of the transmission line is different, so it should be fully considered in the research of galloping prevention and control technology.

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Section: Effect Of Ice Shape On Gallopingmentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

et al. 2022

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“…Tab. the dotted line represents the approximate analytical solution of the multiple scale method, which corresponds to equation (23). When the amplitude (p) of the excitation term in Fig.…”

Section: Approximate Analytical Solution Of Amplitude For Non-resonancementioning

confidence: 99%

Forced-self-excited system of iced transmission lines under planar harmonic excitations

et al. 2022

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This paper is concerned with the analysis of the self-excited vibrations and forced vibrations of the iced transmission lines. By introducing the external excitation load, the effect of dynamic wind on the nonlinear vibration equations of motion is reflected by vertical aerodynamic force. The approximate analytical solution of the non-resonance, and the amplitude frequency response relation of the principal resonance of the forced self-excited system are obtained by using the multiple scale method. With the increase in excitation amplitude, the nonlinearity of the system is enhanced, and the forced-self-excited system experiences three vibration stages (self-excited vibration, the superposition form of self-excited vibration and forced vibration, forced vibration controlled by nonlinear damping). Among them, the accuracy of the approximate analytical solution decreases with the increase of the nonlinear strength. And the excitation amplitude is greater than the critical value, the quenching phenomenon appear in the forced-self-excited system, and the discriminant formula is derived in this paper. In addition, the frequency of excitation term determines the vibration form of the system. The principal resonance, super-harmonic resonance and subharmonic resonance of the forced-self-excited system are analyzed by using different excitation frequencies. Compared with the principal resonance and the harmonic resonance, the meaningful transition from periodic response to quasi periodic response is easy to appear with the condition of the 1/3-order sub-harmonic and the 3-order super-harmonic. The conclusions would be helpful to the practical engineering of the iced transmission lines. More important, as a combination of Duffing equation and Rayleigh equation, the forced-self-excited system also has high theoretical research value.

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“…Because the conductor freezes in a low-temperature environment, the cross-section finally forms an asymmetric circular shape [2], The section shape will provide greater aerodynamic force for the conductors. Transmission lines will inevitably freeze in winter, and the natural wind would induce the iced lines to produce low-frequency and largeamplitude galloping under certain conditions [3]. Conductor galloping may damage conductors or other parts, or bring immeasurable economic losses such as line and tower breaking [4,5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors Tower Line System

Bowen

Cai

Zhou³

et al. 2022

Buildings

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The galloping condition of an iced eight-bundle conductor tower line system, under different parameters, is studied by using a finite element model of a multi-span iced eight-bundle conductor tower line system. The galloping frequency, amplitude, traces of multi-span iced eight-bundle conductors under different wind velocities, span lengths, and initial angles of wind attack are discussed. The different tower line connection methods are compared, based on existing research on the relationship between the aerodynamic characteristics of the conductor and galloping conditions. The results show that the galloping situation of a multi-span iced eight-bundle conductor tower line system varies greatly depending on the conditions, which has a significant impact on the tower line.

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Galloping Stability and Wind Tunnel Test of Iced Quad Bundled Conductors considering Wake Effect

Cited by 7 publications

References 23 publications

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors

Forced-self-excited system of iced transmission lines under planar harmonic excitations

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors Tower Line System

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