Journal ArticleDOI
Vibration of a water droplet on a polymeric insulating material subjected to AC voltage stress
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In this article, the behavior of a water droplet on a silicone rubber plate was observed with a high-speed camera under ac voltage application, and it was confirmed that water droplets vibrated and that a remarkable deformation from the original droplet form occurred at the mechanical resonance frequency.Abstract:Â
The behavior of a water droplet on a silicone rubber plate was observed with a high-speed camera under ac voltage application. It was confirmed that a water droplet vibrated and that a remarkable deformation from the original droplet form occurred at the mechanical resonance frequency. Vibration frequency of an uncharged water droplet was double the frequency of the applied voltage. On the contrary, in the case of an artificially charged droplet, vibration frequency was the same with that of the applied voltage. A macroscopic mechanical model was devised, to which the experimental data were well correlated. Flashover voltage via the water droplet was also measured. Lower flashover voltage was obtained at the mechanical resonance frequency.read more
Citations
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Electrified droplet on corona-charged surface of silicone rubber/SiO 2 nanocomposite
TL;DR: In this paper, the effect of nano-silica weight percent on the surface charge density and surface charge on contact angle was analyzed under dc voltage stress and the relationship among the charge density, the contact angle, and the flashover voltage via the droplet was obtained.
Journal ArticleDOI
Understanding the performance of corona aged epoxy nano micro composites
Belaguppa Manjunath Ashwin Desai,Palash Mishra,Nilesh J. Vasa,Ramanujam Sarathi,Takahiro Imai +4 more
TL;DR: In this paper, the authors used laser induced breakdown spectroscopy (LIBS) technique for characterisation of samples and measured threshold fluence and plasma temperatures through LIBS studies to classify the ageing condition of the composite material.
Journal ArticleDOI
Pattern identification of surface flashover induced by discrete water droplets on polymer insulator
TL;DR: In this paper, a histogram of surface discharge image shows the increasing number of discharge pixels at the side of higher gray-scale value, the total luminance emitted by surface discharges shows the significant increase at the stage of surface flashover.
Journal ArticleDOI
Hydrophobicity evaluation of silicone rubber insulator using PD-induced electromagnetic wave
TL;DR: In this article, an antenna is utilized to receive the high-frequency electromagnetic wave produced by the surface discharges, which are associated with the hydrophobicity variation, and the electromagnetic signals are analyzed by a signal processing system based on the wavelet transform theory.
References
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Journal ArticleDOI
The electrical performance of polymeric insulating materials under accelerated aging in a fog chamber
TL;DR: In this paper, a theoretical model to determine the effect of dry band discharges on material performance was presented, and good agreement between the predicted behavior and the experimental findings was shown.
Journal ArticleDOI
Aging of nonceramic insulators due to corona from water drops
TL;DR: In this article, the fundamental principles of water drop corona as an aging mechanism for nonceramic insulators are presented, and it is demonstrated that water drops in the shed and sheath regions enhance the electric field and may cause corona which can play an important role in long-term performance.
Journal ArticleDOI
Hydrophobic behavior of insulators coated with RTV silicone rubber
S.H. Kim,E.A. Cherney,R. Hackam +2 more
TL;DR: In this paper, the surface free energies due to London dispersion and hydrogen bonding forces on the surface of RTV coatings were calculated from the contact angle measurements using both water and methylene iodide.
Journal ArticleDOI
Water drop corona effects on full-scale 500 kV non-ceramic insulators
TL;DR: In this article, it was shown that certain regions of commercially available 500 kV non-ceramic insulators have surface electric fields that are above the threshold for water drop corona.
Journal ArticleDOI
Effect of Hydrophobicity on Electric Field Distribution and Discharges Along Various Wetted Hydrophobic Surfaces
TL;DR: In this article, a correlation was found between the distribution of the spectrum of surface discharges and hydrophobicity via the joint time and frequency analysis of discharges on various hydrophobic surfaces.
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