The Distinguishing Quality of Water Droplets on Insulating Surface under AC and DC Electric Field Stress

Abstract:

This paper presents the comparison of water droplets on insulating surface under alternating current (AC) and direct current (DC) electric field. Besides that, it is demonstrated about the insulator deterioration under both electric field stressed due to an ageing and partial discharge (PD) phenomenon. The vital parameters factors are water droplets conductivity, droplet volume, surface roughness and droplet positioning that they cause to occur the electric field intensification. The field is intensified at the interface between the droplet, air and insulating material. Thus, the PD occurred due to electric field intensification increases with the deformed droplet. The deformation of water droplet under AC electric field stress is more intense than DC field. The electrostatic forces change the droplet shapes and spread them along the electric field direction. The local electric field intensification provokes the PD giving way to reduction of hydrophobicity of insulator surfaces. In addition, the PD activity could appear as a trigger for a surface breakdown. And the localized arcs cause damage to insulating material then finally leads to deterioration of insulation materials and the pollutant contamination.

• Periodical: Advanced Materials Research (Volumes 1025-1026)
• Pages: 803-808
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1025-1026.803
• Online since: September 2014
• Authors: Sackthavy Chandavong*, Kittipong Tonmitr, Arkom Kaewrawang
• Keywords: Electric Field Stress, Partial Discharge (PD), Water Droplets

References

[1] S.S. Dessouky et al.: Online J. Power and Ener. Eng. Vol. 2, No. 1, p.161.

[2] J.S. Ivan Lopes et al.: in IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 8, No. 2 (2001), p.262.

[3] Y. Cheng et al.: J. Electr. Eng. Vol. 63, No. 3 (2012), p.196.

[4] K.L. Chrzan: Performance of Hydrophobic Epoxy Insulators under Industrial Pollution, in XVth International Symposium on High Voltage Engineering, (2007) p.1.

[5] S. Keim et al.: Experimental Investigations on Electrohydrodynamic Phenomena at Single Droplets on Insulating Surfaces, in IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), p.133 (2003).

DOI: 10.1109/ceidp.2003.1254812

[6] X. Zhang et al.: Behavior of Low Current Discharges between Water Drops, in IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), p.437 (2009).

DOI: 10.1109/ceidp.2009.5377867

[7] S. Feier-Iova et al.: Partial Discharge Inception Voltage of Water Drops on Insulating Surfaces Stressed by Electrical Field, in IEEE Electrical Insulation Conference, p.21 (2009).

DOI: 10.1109/eic.2009.5166318

[8] Konstantions et al.: J. Electr. Eng. Vol. 56, No. 7-8 (2005), p.169.

[9] Michael et al.: Analysis of Polymer Surface Modifications due to Discharges Initiated by Water Droplets under High Electric Fields, in Engineering and Technology, (2009), p.871.