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The influence of ozone surface treatment on surface flashover performance of epoxy resin/AhO3 microcomposites was investigated. Epoxy resin/AhO3 microcomposite samples with a diameter of 50 mm and a thickness of 1 mm were prepared and treated by ozone for various periods. Surface potential decay, surface conductivity, secondary electron emission coefficient, and surface flashover voltage in SF6 of...
This paper focuses on the impulse and DC surface flashover performance of LDPE/TiO2 nanocomposites, which is beneficial to the improvement of electric discharge in power equipment. The results point out that both impulse and DC surface flashover voltages initially increase and then decrease with the increase of nanoparticle loading (DC flashover voltage is higher than that of impulse). Samples with...
It is known that nanocomposites may have better surface flashover properties, which are important to the use of dielectrics in electrical equipment. By changing the content of nanoparticles added into polymers, the surface flashover voltage of nanocomposites can be increased by 30 %. One reason is that the changing of nanoparticles makes a contribution to different trap characteristics. As the density...
Because of the special surface energy of nanoparticles, the electrical, thermal and mechanical properties of nanocomposties may be improved. In general, emission of electrons at cathode leads to charging of the surface and thus results in surface flashover. Since flashover happens at the interface between dielectrics and atmosphere, different characteristics of atmosphere and dielectric may influence...
Surface flashover is one of the main factors leading to insulation failure. For example, epoxy insulator in Gas Insulated Switchgear (GIS) is the most vulnerable insulation components; the failure endangers the reliability of GIS and even leads to accidents and economic losses. Thus, developing advanced materials to be much more safely used in GIS is significant. Here we report the study on surface...
Compared with breakdown strength of insulating material used in power equipments, insulator employed in power system is easy suffered from surface flashover in vacuum. So, surface flashover has become a mainly restricted factor for developing high voltage and efficiency power equipments in vacuum. Although many works have been done to investigate the characteristics of surface flashover in vacuum,...
In the paper, the influences of trap levels on both DC and impulse surface flashover voltage of semi-crystalline cross-linked polyethylene (XLPE) in vacuum were investigated. With different heat-treatment, the electrical properties and trap distribution of samples were studied. It is proposed that the trap levels are changed by heat treatment leading to the improvement of surface flashover properties...
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