Behaviour of electrical field intensification due to water droplet on solid dielectric surfaces

Abd Hamid, Siti Munirah (2015) Behaviour of electrical field intensification due to water droplet on solid dielectric surfaces. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Outdoor polymeric insulators subjected to electric stress as well as to environmental condition such as rain, fog and dew. The presence of water droplets on the surface of polymer tends to deform the electric field distribution. The deformation is more due to increasing of the electric field strength. Due to this phenomenon, deterioration of the insulator surface may occur. The difference in relative permittivity, shape, conductivity and quantity of the droplets are among the factors that contribute such a behavior. Those factors were simulated to analyze the behavior intensification of electric field due to water droplet presence using COMSOL Multiphysics version 3.5a. The electric potential contour and tangential electric field on the dielectric surface simulated and analyses in the absence of water drop as a reference value. The results help to understand how the electric field distribution will be change in the presence of water droplet. The different parameter; shape, permittivity, conductivity and number of droplet has been considered and the tangential electric field has been analyzed and compared to dry dielectric surface. The identified four parameters were changed to see the difference. The results showed that the presence of water droplet on the dielectric surface material might intense the electric field about 3.36 times for flattened shape of water droplet and 1.56 times for semispherical water droplet which was verified with comparison on dry dielectric surface. The result also strongly shows that the increment of electric field is at the interface of the water droplet, air and the insulating material or triple point junction of water droplet. Furthermore, water droplet with contact angle less than 90o will increases the tangential electric field almost twice. From this project, water droplet shows the significant in increment of electric field on outdoor polymeric insulator.

Item Type:Thesis (Masters)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3001-3521 Distribution or transmission of electric power
ID Code:7573
Deposited By:Normajihan Abd. Rahman
Deposited On:06 Mar 2016 17:10
Last Modified:06 Mar 2016 17:10

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