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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...
Epoxy resin (EX) is widely used for insulation in electric devices, but it has a relatively low thermal conductivity. One approach to obtain a higher thermal conductivity is to introduce inorganic fillers which have high thermal conductivity. Tracking failure is a thermal breakdown phenomenon which has a close relation with the thermal accumulation. In this paper, epoxy samples with boron nitride...
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...
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...
Epoxy resin used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the dielectric properties comparing with the undoped materials. However, due to the change of the material structure, trap characters and charge behaviors are altered as a response. This possibly leads to a great risk of electric...
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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