Corona discharge phenomenon and behavior of water droplets on the surface of polymer in the AC electric field

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.

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Partial discharge investigation and electric field analysis of different oscillation modes of water droplets on the surface of polymeric insulator under tangential AC electric field stress

2013 IEEE International Conference on Solid Dielectrics (ICSD) ◽

10.1109/icsd.2013.6619788 ◽

2013 ◽

Cited By ~ 6

Author(s):

M. H. Nazemi ◽

V. Hinrichsen

Keyword(s):

Electric Field ◽

Partial Discharge ◽

Field Analysis ◽

Water Droplets ◽

Field Stress ◽

Ac Electric Field ◽

Oscillation Modes ◽

Electric Field Analysis

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Investigation of Uniform and Non-Uniform Water Droplets on Different Configurations of Silicon Rubber Composite Insulators Subjected to AC Electric Field Stress

2020 3rd International Conference on Energy, Power and Environment: Towards Clean Energy Technologies ◽

10.1109/icepe50861.2021.9404509 ◽

2021 ◽

Author(s):

H.P. Shrimathi ◽

Mithun Mondal

Keyword(s):

Electric Field ◽

Water Droplets ◽

Silicon Rubber ◽

Field Stress ◽

Ac Electric Field ◽

Rubber Composite

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.979 ◽

2014 ◽

Vol 931-932 ◽

pp. 979-983

Author(s):

Sackthavy Chandavong ◽

Kittipong Tonmitr ◽

Arkom Kaewrawang

Keyword(s):

Electric Field ◽

Water Drop ◽

Partial Discharge ◽

Water Droplets ◽

Humidity Effect ◽

Insulator Surface ◽

Ac Electric Field ◽

Flashover Voltage ◽

Alternative Current ◽

Lower Voltage

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.

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