Parameter Study on Galloping of Iced Bundled Conductors

Hu, Jing; Yan, Bo; Song, Zhiyao; Zhang, Hongyan; Li, Hao; Miao, Changsheng

doi:10.1109/appeec.2010.5449435

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…4 Galloping occurs at temperatures around or below 0°C, as non-symmetrical ice aggregations along the transmission lines are usually initiating this low frequent vibration phenomenon associated with large vibration amplitudes (0.1-1 Hz). 5,6 The increase of structural damping is an effective way to raise the critical wind speed for the onset of galloping. 7 Nanoparticles, such as nanoclay (NC) and nanotubes (NT) within composite materials, have been found to enhance the static and dynamic material properties, specifically with regard to damping.…”

Section: Introductionmentioning

confidence: 99%

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Kliem

Høgsberg

Wang

et al. 2017

Advances in Mechanical Engineering

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The effect of nanoclay on various material properties like damping and strength of typical thermoset polymers, such as epoxy and vinyl ester, was investigated. Different environmental conditions typical for high-voltage transmission pylons made of composite materials were taken into account. Resin samples were prepared with various clay weight fractions ranging from 0% to 3%. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and rheological analysis were used to study the morphology and the structure of the nanocomposites. For all nanoclay-modified thermoset polymers, the morphology was found to be of exfoliated structure mainly. Static, uniaxial tensile tests showed that the addition of nanoclay to thermoset polymers led to a beneficial effect on the stiffness, whereas the tensile strength and ductility significantly decreased. When exposed to different environmental conditions, nanoclay was found to have a positive influence on the dynamic properties, analysed by a dynamic mechanical thermal analysis. The addition of nanoclay to the thermoset resin led to an increase of the damping properties by up to 28% for vinyl ester and up to 6% for epoxy at 220°C. The dielectric properties were evaluated by electrical breakdown strength tests resulting in 11% better insulating behaviour for nanoclay-modified vinyl ester.

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Section: Introductionmentioning

confidence: 99%

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Kliem

Høgsberg

Wang

et al. 2017

Advances in Mechanical Engineering

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“…As expected, only small variations between DMTArelated damping properties with unbalanced and balanced stacking sequences are observed. The difference in loss factor at ' ¼ 30 and ' ¼ 60 are similar (see Figure 18) and will therefore cancel each other out, when calculating the shear damping 12 based on equations (5) and (6). The damping prediction for laminates with stacking sequences at large fibre angles [þ60,À60] s is equally inaccurate for both DMTA-related damping input parameter sets.…”

Section: Comparison Of Numerical and Experimental Damping Analysismentioning

confidence: 96%

“…Due to the linear strain-rate behaviour, a global amplitude of 150 mm was chosen for all DMTA tests. The test conditions were chosen so that they resemble those in a galloping-prone environment with frequencies between 0.5 Hz and 2.0 Hz and temperatures between À20 C and 0 C. 5,6 Additional damping measurements were carried out with the vibrating beam test (VBT) method at 20 C in order to verify the comparability of the two common damping measurement techniques.…”

Section: Dynamic Mechanical Thermal Analysismentioning

confidence: 99%

“…As the self-damping capability of the transmission lines is limited, [2][3][4] the amplitude level associated with cable vibration phenomena, such as the severe galloping instability, is one of the main design drivers for the overall architecture of large transmission line systems. The long-wave galloping vibration is characterized by very low frequencies of 0:1 À 1 Hz and temperatures below 0 C. 5,6 Non-symmetrical ice aggregations along the overhead transmission lines in combination with wind speeds between 4 and 20 m/s 7,8 can initiate self-excitation which may lead to catastrophic failure of the entire structure due to excessive vibration amplitudes at resonance. 9,10 This issue can be mitigated by increasing the energy dissipation in the material used in the power pylon.…”

Section: Introductionmentioning

confidence: 99%

“…Overview of the different specimen configurations. Â 10 mm Â 1.5 mm AE 0.1 mm AF[']5 60 mm Â 10 mm Â 0.9 mm AE 0.1 mm GF j GF j GF j AF [']5 220 mm Â 15 mm Â 1.9 mm AE 0.1 mm GF j AF j GF j AF j GF VBT: vibrating beam test; DMTA: dynamic mechanical thermal analyser.…”

mentioning

confidence: 99%

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Damping properties of non-conductive composite materials for applications in power transmission pylons

Kliem¹,

Rüppel

Høgsberg³

et al. 2018

Journal of Composite Materials

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A Review of Icing and Anti-Icing Technology for Transmission Lines

Zhang

Yue

et al. 2023

Energies

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This paper reviews the application of various advanced anti-icing and de-icing technologies in transmission lines. Introduces the influence of snowing and icing disasters on transmission lines, including a mechanical overload of steel towers, uneven icing or de-icing at different times, Ice-covered conductors galloping and icing flashover of insulators, as well as the icing disasters of transmission lines around the world in recent years. The formation of various icing categories on transmission lines, as well as the effect of meteorological factors, topography, altitude, line direction, suspension height, shape, and electric field on ice-covered transmission lines, are all discussed in this study. The application of various advanced anti/de-icing technologies and their advantages and disadvantages in power transmission lines are summarized. The anti/de-icing of traditional mechanical force, AC/DC short-circuit ice melting, and corona effect is introduced. Torque pendulum and diameter-expanded conductor (DEC) have remarkable anti-icing effects, and the early investment resources are less, the cost is low, and the later maintenance is not needed. In view of some deficiencies of AC and DC ice melting, the current transfer intelligent ice melting device (CTIIMD) can solve the problem well. The gadget has a good effect and high reliability for de-icing conductors in addition to being compact and inexpensive. The application of hydrophobic materials and heating coatings on insulators has a certain anti-icing effect, but the service life needs further research. Optimizing the shed’s construction and arranging several string kinds on the insulators is advisable to prevent icing and the anti-icing flashover effect. In building an insulator, only a different shed layout uses non-consumption energy.

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Parameter Study on Galloping of Iced Bundled Conductors

Cited by 3 publications

References 6 publications

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Damping properties of non-conductive composite materials for applications in power transmission pylons

A Review of Icing and Anti-Icing Technology for Transmission Lines

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