Deformation of water droplets on solid surface in electric field

With the accelerating construction of strong smart grid, and the grid voltage level rising, performance requirements for the electrical insulation of electrical equipment also continue to increase. In terms of the advantages of RTV on antifouling, RTV-based paints coated insulator coating capacity of its flash tolerance can significantly increase, mainly due to RTV coating hydrophobic hydrophobicity and migration. But when the hydrophobic surface is in the fully wet, many small drops of water in the surface will be gathered into big drops of water, and these large droplets will distort the surface electric field of the medium. So the flashover voltage of the hydrophobic surface’s separated water droplets under DC electric field are analyzed comparatively in this paper, while some influencing factors such as different medias and volume of water drops, are introduced in specific experiments, and their effects on the flashover voltage are analyzed; under DC electric field experiment on the surface of hydrophobic and hydrophilic surface flashover voltage drops separation characteristics were studied.

Download Full-text

Direct measurements of coalescence efficiency and frequency of small water droplets in an electric field

Tellus ◽

10.1111/j.2153-3490.1973.tb01595.x ◽

1973 ◽

Vol 25 (1) ◽

pp. 63-68 ◽

Cited By ~ 1

Author(s):

LUAN PHAN-CONG ◽

PHUOC DINH-VAN

Keyword(s):

Electric Field ◽

Water Droplets ◽

Small Water ◽

Direct Measurements

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1025-1026.803 ◽

2014 ◽

Vol 1025-1026 ◽

pp. 803-808

Author(s):

Sackthavy Chandavong ◽

Kittipong Tonmitr ◽

Arkom Kaewrawang

Keyword(s):

Electric Field ◽

Water Droplets ◽

Insulating Material ◽

Field Stress ◽

Ac Electric Field ◽

Quality Of Water ◽

Electric Field Direction ◽

Surface Breakdown ◽

Dc 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.

Download Full-text