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XLPE-silicon rubber interface is the weakest part of cable system. Dielectric breakdown called tracking failure of the interface often occurs. The failure endangers the reliability of power delivery. Massive application of power electronics easily causes over voltage or high electric field of impulse in power system, and leads to discharge or tracking failure of the interface. Therefore, it is very...
Micro-cavity may possibly be introduced into the XLPE-silicon rubber interface in installation of XLPE cable joint. This type of defect greatly decreases the interfacial breakdown strength and endangers the stability of power system. However, the tracking failure process is still unknown. In this paper, three types of interfaces with different dimension of micro cavity were setup by pressing together...
This paper investigates the effect of nano-scale Al2O3 on the tracking failure resistance of silicone rubber nanocomposites. The samples were prepared by filling nano-scale Al2O3 in silicone rubber with the weight ratios of 0.25, 0.5, 1, 1.5, 3 wt%. AC voltage (0 kV-50 kV) was applied on a pair of needle-plate electrodes on the nanocomposites surface with insulation distance of 10 mm. The weight loss,...
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...
This paper investigated the effects of interfacial pressure on the discharge and tracking failure at the interface between XLPE and silicon rubber by analyzing the distribution of discharge light emitted during the failure process. The test sample was made by pressing together a piece of XLPE and a piece of transparent silicon rubber with the pressure of 20 kN/cm2, 100 kN/cm2 and 300 kN/cm2, respectively...
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...
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