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This paper describes the results of experiments made to examine the erosion of alumina trihydrate filled silicone rubber exposed to dry band arc discharges. The eroded shape and weight loss of each sample, caused by the dry band arc discharges, were evaluated. The eroded amounts of the silicone rubbers aged in dry band arc discharge by changing in electrolyte conductivity were measured. The average...
This paper presents the results of an investigation on the DC flashover characteristic of contaminated glass insulators at natural high altitudes (1970 m). The arcing behavior on natural contaminated glass insulator surfaces was studied using a high-speed camera. The experimental results show that the DC arcs have a significant influence on the flashover performance of contaminated glass insulator...
Arc induced degradation of polymeric materials used for outdoor HV insulation has been studied using a 532 nm visible wavelength laser. The degradation behavior is modeled by a modified Helmholtz equation. Two parameters are introduced in the theoretical model developed; a propagation factor alpha which is predominantly dependent on the laser power, and an ablation factor beta , which is a function...
The paper presents results on eroded mass measurements for nanofilled silicone rubber by controlled infrared laser heating, which simulates hot spot heating by dry-band arcing on wet and polluted composite insulators. Improvement in dispersion by surface treatment of the nanofillers with surfactants and by calcination is demonstrated. Along with improved dispersion of the nanofillers, a significant...
This paper analyzes flashovers of apparatus insulators that occurred in a 345 kV generating station. It has been shown that flashovers can occur with low levels of surface contamination and is attributed to factors such as, wind blown cooling tower drifts and highly nonlinear electric field distribution on the insulator surface. Computation of the electric field on the insulator surface confirmed...
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