Journal ArticleDOI
UHF technique for identification of discharges initiated by liquid droplet in epoxy nanocomposite insulation material under ac voltages
Ramanujam Sarathi,G Nagesh +1 more
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In this article, the feasibility of using a ultra-high frequency (UHF) technique for identification of any corona discharge/arcing in insulating material due to water droplets was made.Abstract:
In this work, an attempt has been made to understand the feasibility of using a ultrahigh frequency (UHF) technique for identification of any corona discharge/ arcing in insulating material due to water droplets. The sensors of broadband type are useful for the identification of such discharges. It is realized that corona discharges/arcing initiated by liquid droplet radiates UHF signals in the entire bandwidth up to 2 GHz. The frequency content of the UHF signal generated due to corona/arcing is not much varied in epoxy nanocomposites with different weight percentage of clay content. The exfoliated/intercalated properties were analysed through TEM studies. It is realized that corona initiated discharges are of intermittent process. It is observed that the permittivity and tan(δ) reduces with increase in percentage of clay in epoxy nanocomposite material up to 3 wt%. The hydrophobicity of the material is characterized through contact angle measurement. It is realized that low weight percentage of nanoclay content in epoxy resin reduces the surface carbonization due to arcing.read more
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Impact of shear mixing time of epoxy-silica nanocomposites on its electrical and mechanical properties
TL;DR: In this paper, the shear mixing time was varied to study its influence on electrical and mechanical behavior of epoxy-silica nanocomposites, and a marginal increase in contact angle was noticed.
Influence of Corona Ageing on Electrical and Mechanical Behaviour of Epoxy Micro-Nanocomposites
TL;DR: In this paper, the authors used UHF and fluorescence techniques to determine the inception voltage (CIV) and surface potential decay analysis showed an increment in decay rate of surface potential and left shift of trap density curves with increment in corona ageing period.
Journal ArticleDOI
Investigation of water droplet-initiated discharges on laser textured silicone nano-micro composites using UHF and fluorescent fibre techniques
Somasundaram Karthikeyan Amizhtan,Parvathy Ganesh,Balaji Srinivasan,Nilesh J. Vasa,Sivanandam Aravindan,Ramanujam Sarathi +5 more
Journal ArticleDOI
Flashover characteristics of a droplet impacting the silicone rubber surface
TL;DR: In this paper , the dynamic flashover characteristics of the water droplets impacting the SIR surface are studied, and the minimum flashover voltage occurs at the moment when the spreading area of a water droplet reaches the maximum.
References
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Journal ArticleDOI
Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materials
TL;DR: In this article, a review of polymer-layered silicate nanocomposites is presented, where the polymer chains are sandwiched in between silicate layers and exfoliated layers are more or less uniformly dispersed in the polymer matrix.
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Synthesis and Characterization of Layered Silicate-Epoxy Nanocomposites
Journal ArticleDOI
Polymer nanocomposites as dielectrics and electrical insulation-perspectives for processing technologies, material characterization and future applications
TL;DR: In this article, the future of mesoscopic properties of nanocomposite polymers is discussed, and several interesting results to indicate the foreseeable future have been revealed, some of which are described on materials and processing, together with basic concepts and future direction.
Journal ArticleDOI
Partial discharge monitoring of power transformers using UHF sensors. Part I: sensors and signal interpretation
TL;DR: In this article, the propagation velocity matrix (PVM) and propagation time matrix (PTM) were introduced to detect partial discharge (PD) in power transformers, which can be used to index a database of physical descriptions of the transformer that could provide additional information to assist with diagnosis.
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