The Flashover Phenomena due to Water Drops on Insulating Surface under DC Electric Field

2014 ◽  
Vol 931-932 ◽  
pp. 962-967 ◽  
Author(s):  
Sackthavy Chandavong ◽  
Kittipong Tonmitra ◽  
Arkom Kaewrawang
Keyword(s):  
Electric Field ◽  
Epoxy Resin ◽  
Direct Current ◽  
Water Drop ◽  
Tap Water ◽  
Water Volume ◽  
Electric Field Line ◽  
Insulating Surfaces ◽  
Dc Electric Field ◽  
Water Drops

This paper presents the flashover between the electrodes conducted the current by the water drop on insulating surfaces. It causes ageing to the insulator and leads to deterioration when the insulator is used for over years. In the experiments, epoxy resin with the water drop is tested by using direct current until flashover of 70 kV. Besides that, the effect of the water volume, the number of the water drop and the water types - tap and aqua water on flashover are investigated. The flashover of tap water grows faster when increases the volume of water drop. The flashover of aqua water does not depend on the volume of water drop. The deformation and elongate of water drop is in the direction of electric field line. The results lead to protect the damage of insulator caused by the humidity and the loss of their efficiency insulators.

Study on Discharge of Separated Water Droplets in DC Field

2011 ◽  
Vol 130-134 ◽  
pp. 3276-3279
Author(s):  
Zong Xi Zhang ◽  
Shan Feng Yin
Keyword(s):  
Electric Field ◽  
Hydrophobic Surface ◽  
Electrical Equipment ◽  
Water Droplets ◽  
Surface Flashover ◽  
Voltage Drops ◽  
Flashover Voltage ◽  
Dc Electric Field ◽  
Water Drops ◽  
And Migration

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.

Environmental Study on the Behavior of Water Drops with Circular Resin Insulator Material under DC Electric Field Stress

2014 ◽  
Vol 979 ◽  
pp. 111-114
Author(s):  
Soukvilay Phimmasene ◽  
Kittipong Tonmitra ◽  
Apirat Siritaratiwat ◽  
Arkom Kaewrawang
Keyword(s):  
Distribution System ◽  
Water Drop ◽  
Environmental Study ◽  
Single Drop ◽  
Electrical Field ◽  
High Voltage Direct Current ◽  
Dc Electric Field ◽  
Water Drops ◽  
The Stability ◽  
Lower Voltage

The influence of damages on the insulator’s surface in the distribution system is investigated in this paper. The circular resin is used as the specimen under high voltage direct current (HVDC) between the electrodes with diameter of 2 mm and distance between both electrodes are 35 mm. There are three cases in the experiment and it was tested in environmental condition under dry surface, single droplet and double droplets. The HVDC had been applied to the electrodes, the level of applied were 5, 10, 15, 20, 25, 30 and 35 kV. The results show that the arc occurs rapidly in the case of single and double drops with compared to dry surface. The movements of the water drop of the single and doubles are pretty similar, but the arc occurs quickly in the double drop in comparison with single drop owing to double drops stretch to each other. The double drops take a lower voltage on stretching, whereas the single drop takes higher because the double drops have much more densities than single drop. Besides, the double drops act as a bridge allow the electrical field generated from both electrodes pulled them resulting in arcing easily. In conclusion, the droplets on the surfaces cause the leakage current and it has an effect on the stability of the distribution system.

Effect of Direct Current Electric Field Assisted Heat Treatment on the Luminescence Properties of TeO2-ZnO-Bi2O3 Glasses Containing Silver Nanoparticles

2021 ◽  
Vol 66 ◽  
pp. 13-25
Author(s):  
Min Hui Zhang ◽  
Jian Lin ◽  
Song Ye ◽  
Zi Min Zhu
Keyword(s):  
Heat Treatment ◽  
Silver Nanoparticles ◽  
Electric Field ◽  
Direct Current ◽  
Emission Intensity ◽  
Metallic Nanoparticles ◽  
Luminescence Properties ◽  
Luminescence Efficiency ◽  
Dc Electric Field ◽  
Current Electric Field

Introduction of metallic nanoparticles into glasses can obviously improve the up-conversion luminescence efficiency through surface plasmon resonance (SPR). In this research, the Er3+/Yb3+ co-doped TeO2-ZnO-Bi2O3 glasses containing silver nanoparticles and nanocrystals were prepared by direct current(DC) electric field assisted heat treatment, to study the effect of silver nanoparticles on the up-conversion luminescence properties of Er3+. The results show that, although the introduction of AgNO3 will weaken the thermal stability of TZB-ErYb to some extent, the number and size of silver nanoparticles can be increased after DC electric field treated at 100°C for 10 minutes. Meanwhile, the nanocrystals do not grow too large to affect the up-conversion emission intensity of Er3+. The up-conversion emission intensity of Er3+ in TZB-ErYb-6AgNO3-100°C-150V-10min is 43 times stronger than that of TZB-ErYb. These results indicate that DC electric field assisted heat treatment can synergistically adjust the silver nanoparticles and nanocrystals and is a promising method to improve the luminescence properties of tellurite glasses.

The Effect of Growth, Migration and Bacterial Cellulose Synthesis of Gluconacetobacter xylinus in Presence of Direct Current Electric Field Condition

2012 ◽  
Vol 550-553 ◽  
pp. 1108-1113 ◽  
Author(s):  
Lin Yan ◽  
Shi Ru Jia ◽  
Xin Tong Zheng ◽  
Cheng Zhong ◽  
Miao Liu ◽  
...  
Keyword(s):  
Electric Field ◽  
Bacterial Cellulose ◽  
Electric Fields ◽  
Direct Current ◽  
Cellulose Fiber ◽  
Sem Analysis ◽  
Cellulose Synthesis ◽  
Gluconacetobacter Xylinus ◽  
Growth State ◽  
Dc Electric Field

In this study, the movement and orientation of bacteria cells were controlled by direct current(DC) electric fields, result in altering alignment of bacterial cellulose nanofiber and further changing the 3-dimensional network structure of bacterial cellulose. A modified swarm plate assay was performed to investigate the migration of Gluconacetobacter xylinus cells which exposed in DC electric field. It suggested that the cells moved toward to negative pole and with the increasement of the electric field strength the velocity will also increase. The SEM analysis demonstrated that the cellulose fiber bundles which synthesized at 1V/cm have lager diameter and a trend toward one direction. Meanwhile the growth state of G.xylinus in the presence of DC electric field was also being observed.

Mono-emulsion droplet stretching under direct current electric field

Soft Matter ◽  
2019 ◽  
Vol 15 (11) ◽  
pp. 2328-2335 ◽  
Author(s):  
Muhammad Salman Abbasi ◽  
Ryungeun Song ◽  
Sung-Min Kim ◽  
Hyoungsoo Kim ◽  
Jinkee Lee
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Experimental Studies ◽  
Emulsion Droplet ◽  
Direct Current Electric Field ◽  
Dc Electric Field ◽  
Current Electric Field

Theoretical, numerical and experimental studies on transient stretching and breakup of a mono-emulsion droplet under DC electric field.

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