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The incorporation of inorganic nano particles (TiO2, Al2O3 and SiO2 etc.) with polyimide (PI) greatly improves its dielectric property. The dielectric properties of PI films are largely influenced by the absorbed water and humidity. What is more, the water absorption will be affected greatly by nano particles. In this paper, to study the effects of absorbed water on dielectric properties of moistened...
Nano-MgO particles were added in epoxy with particle weight ratios of 1, 3, 5, 7 wt%. Tracking experiments were carried out by using dc voltage. The tracking process was recorded by a high speed camera. The relation of tracking failure with the adding rate and applied voltage was investigated. Obtained results indicated that with increasing adding rate from 0 to 5 wt%, number of drops needed in tracking...
Silicon rubber is widely employed as insulating materials in transmission lines due to its excellent electrical and mechanical properties. The discharges that happen inevitably during the operation of the composite insulators release too much heat that can cause electrical erosion on the surface of silicon rubber (SiR) insulators. It is known that the aim of improving the resistance to tracking and...
Epoxy/MgO nanocomposites were obtained by mixing nano-MgO particles into neat epoxy with filler loading of 1, 3, 5, 7 wt%. To study the effects of nano-particle content on the tracking failure under dc stress, tracking experiments were carried out. The dc resistance to tracking failure, tracking process and discharge current were measured in relation with the content and the applied voltage. The results...
Epoxy insulator has been widely used in railway transmission line due to its excellent physical and chemical properties. On these transmission lines, corona could occur even on well designed hardware and insulators, which can inject the charge in the surface of insulators and damage the polymer insulators. When a composite insulator is moistened by fog or rain, charged water droplets are formed on...
The 800kv dc transmission line is now in experimental operation in china. Recently, polymer nanocomposites have attracted wide interest as a method of enhancing polymer properties, which may apply as insulators in the UHV and EHV transmission line. A number of papers have reported enhanced electrical performance (aging and breakdown) of silicone rubber nanocomposite, but little attention has been...
Epoxy resin (EX) has been widely used as electrical insulating materials in power systems. It is important to assess the situation of EX insulating materials. As a major factor to result in the deterioration of insulating materials, the space charge behavior in the EX materials is investigated in this paper. To investigate the effect of nano segmentation on the insulation performance and space charge...
This paper investigates the effect of nano-scale SiO2 on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO2 powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation distance of 10 mm. The time to tracking failure and discharge current were recorded...
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