Proceedings ArticleDOI
Effect of resonance of a water droplet located on a hydrophobic sheet on AC flashover
Yoshio Higashiyama,T. Yamada,Toshiyuki Sugimoto +2 more
- Vol. 3, pp 2198-2203
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TLDR
In this article, the effect of resonance vibration on flashover via a water droplet was investigated experimentally, using two kinds of hydrophobic materials, silicone rubber (SR) and PTFE sheet.Abstract:
A water droplet on the hydrophobic sheet subjected by a tangential AC electric field manifests resonant vibration at a definite frequency for a given volume of the water droplet. The effect of resonance vibration on flashover via a water droplet was investigated experimentally, using two kinds of hydrophobic materials, silicone rubber (SR) and PTFE sheet. AC flashover voltage with resonance frequency via a 30 /spl mu/l water droplet was much lower than that with a frequency of 50 Hz. This is due to the extension of the water droplet The decrease of the flashover voltage depends on the kind of materials. Since a water droplet on the PTFE sheet tends to slide more easily than that on the SR sheet, the flashover voltage via the water droplet on the PTFE sheet is much lower than that on the SR sheet.read more
Citations
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Journal ArticleDOI
Stability of alternating current discharges between water drops on insulation surfaces
Simon M. Rowland,Fuchang Lin +1 more
TL;DR: In this paper, the authors consider discharges between water drops when a limited alternating current is available, as experienced by an ageing insulator in service, and identify a phenomenon in which the length of a discharge between two drops is reduced through a particular type of distortion of the drops.
Journal ArticleDOI
Resonant vibration and flashover phenomena of a water droplet located on a hydrophobic sheet under ac field
TL;DR: In this paper, the electrohydrodynamic behavior of a single water droplet located on a hydrophobic silicone rubber sheet under an ac electric field was investigated, and the effect of resonant vibration on flashover via the droplet clear was observed with a high-speed video camera.
Journal ArticleDOI
Electric-field-induced oscillations of water droplets deposited on insulating surfaces
TL;DR: In this article, the 3D oscillations of a water droplet under the effect of external fields, such as gravity and sinusoidal electric field, were investigated numerically.
Proceedings ArticleDOI
Wet conductor surfaces and the onset of corona discharges
Qi Li,Simon M. Rowland +1 more
TL;DR: In this paper, the size of droplets on conductors with a range of surface hydrophobicity is evaluated, and it is found that the droplet varies its shape at twice the power frequency through a semi-spherical, flattened (tortilla), and conical cycle.
Proceedings ArticleDOI
The Vibration Characteristics of Rain Droplet on the Surface of the Overhead Line Conductors
Qi Li,Simon M. Rowland +1 more
TL;DR: In this paper, the frequency response for rain droplet vibration is investigated through two experiments: one subjected to a mechanical vibration system, the other one subject to modulated electrical field, and it has been found that each vibration has a fixed natural/resonance frequency where the magnitude of vibration reaches its maxima, and this natural / resonance frequency is determined by its volume.
References
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Journal ArticleDOI
Disintegration of Water Drops in an Electric Field
TL;DR: In this article, it was shown that a conical interface between two fluids can exist in equilibrium in an electric field, but only when the cone has a semi-vertical angle 49.3$^\circ$.
Journal ArticleDOI
Electrical Coronas: Their Basic Physical Mechanisms
Leonard B. Loeb,Sanborn C. Brown +1 more
Journal ArticleDOI
Some investigations on the deformation and breaking of water drops in strong electric fields
TL;DR: In this paper, the authors studied the behavior of free water drops in strong electric fields such as exist in these storms and made a deduction of the fields required to produce instability in water drops.
Journal ArticleDOI
Free vibrations of a drop in partial contact with a solid support
M. Strani,F. Sabetta +1 more
TL;DR: In this article, the problem of the axisymmetric free vibrations of a liquid drop immersed in an outer fluid and in partial contact with a spherical bowl has been analyzed using the Green function method and expanding the velocity potentials in series of Legendre polynomials.
Journal ArticleDOI
Flashover mechanism of silicone rubber insulators used for outdoor insulation-II
TL;DR: In this paper, the authors investigated the flashover mechanism of silicone rubber composite insulators and found that it is attributed to the hydrophobicity of the silicone rubber and the diffusion of low molecular weight (LMW) polymer chains.