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Due to the excellent electrical properties, such as low dielectric loss, extremely low conductivity and high breakdown strength, polyimide film is widely applied as a kind of engineering plastic film and a type of insulating material in industry. However, with the disadvantage of organic polymer, its corona-resistance property is not good enough. During service operation, partial discharge (PD) may...
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...
Moisture in oil-immersed transformer will become small bubbles suspending in insulation oil at high temperature. In order to investigate the influence of suspending bubbles on tracking failure of oil-impregnated pressboard in oil-paper insulation, a model based on needle-plate electrodes was established. This model was used to study effect of the number of suspending bubbles generated by dropped distilled...
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...
Hydrophobicity performance of polymeric insulator in severe condition has caused more concern about reliability of power system, which increasingly requires the evaluation method for the surface hydrophobicity. In this research, based on the dynamic dropping test (DDT) method, infrared characteristics of surface discharges induced by dynamic behaviors of water droplet were investigated to carry out...
With the wide application of outdoor insulators made from silicone rubber, the electrical accidents induced by the ageing of silicone rubber insulators cause the increasing concern of researchers. Based on a dynamic drop test, this paper focuses on the discharge characteristics generated by the dynamic behavior of water droplet to evaluate the hydrophobicity for different service time of silicone...
This paper presents a study on effects of flammation retardant in polycarbonate (PC) on the luminescence phenomena during the tracking tests. A photo multiplier tube was employed to measure the light intensity, which is found to be well in accordance with the development of tracking failure. The results obtained reveals that light is easily emitted when the phase angle of applied voltage is around...
Faulty insulators change voltage distribution and field distribution in the vicinity of insulator string, which will exacerbate corona discharge, and in extreme cases the amplify can exceed 100%. This paper introduces an UV detector, which detects defective insulators by measuring the UV-light from the discharging insulator. Some tests were carried out. The results indicate that this method can identify...
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