The Effect of Deterioration on Insulating Surface due to Flashover under AC Electric Field Stressed by Water Droplets

Abstract:

This paper presents the effect of the flashover on insulating surface under alternative current (AC) electric field stressed by humidity factor. It is obviously demonstrated about the insulator deterioration due to an ageing, partial discharge (PD) when it is used in services. Epoxy resin with the water droplets is brought to test by high voltage AC until flashover voltage levels. The flashover level on insulator surface depends on the volume and the number of the water droplets. The highest flashover voltage is 52.2 kV for the insulator surface without humidity, but the lowest voltage is 43.5 kV for water droplets of 1, 2, 3 and 4 drops (0.5, 1.0, 1.5 and 2.0 ml). Consequently, it leads to use the lower voltage respectively. The deformation of the water drop was oscillated, moved, elongated and broken up in to a several small drops on insulating surface. PD was the result of the flashover phenomena which causes the damage of the insulator. These results lead to protect the insulator surface under humidity effect from flashover phenomena.

• Periodical: Advanced Materials Research (Volumes 931-932)
• Pages: 979-983
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.931-932.979
• Online since: May 2014
• Authors: Sackthavy Chandavong, Kittipong Tonmitr*, Arkom Kaewrawang
• Keywords: Electric Field Stress, Epoxy Resin (ER), Flashover Phenomena, Leakage Current, Partial Discharge (PD), Water Drop

References

[1] K.L. Chrzan, Performance of hydrophobic epoxy insulators under industrial pollution, University of Ljubljana, 27-31 Aug, 2007, pp.1-4.

[2] T. Braunsberger, Water drop corona on hydrophobic epoxy, International conference on solid dielectrics, 5-9 July, 2004, pp.1-4.

DOI: 10.1109/icsd.2004.1350385

[3] D. kaerner, High-Voltage Insulation Technology, Vieweg & Sohn, Braunschweig Germany, 985.

[4] I.J.S., Lopes, A Study of Partial Dishcharge from water drops on a silicone rubber insulating surface, IEEE Transactions on Dielectrics and Electrical Insulation, vol. 8, 2001, pp.262-268.

DOI: 10.1109/94.919951

[5] S.S. Dessouky, Influence of water contents on the electrical behavior of polymeric insulator, OJPEE, vol. 2, pp.161-167.

[6] S. Feier-Iova, Partial Discharge Inception Voltage of Water Drops on Insulating Surfaces Stressed by Electrical Field, IEEE Electrical Insulation Conference, Canada, 31 May -3June 2009, pp.21-25.

DOI: 10.1109/eic.2009.5166318

[7] M.G. Danikas, A Study of the behavior of water droplets on polymeric surface under the influence of electric field in an inclined test arrangement, J. Electrical Engineering, vol. 60, 2009, pp.94-99.

[8] Y. Cheng, A study of the behavior of water droplets under the influence of uniform electric field in epoxy resin samples, J. Electrical engineering, vol. 63, 2012, pp.196-200.

DOI: 10.2478/v10187-012-0029-3

[9] M.G. Danikas, Analysis of polymer surface modification due to discharge initiated by water droplets under high electric fields, World Academy of Science, Engineering and Technology, 2009, pp.871-876.