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The performance of outdoor insulation greatly influences the reliable and safe operation of the electric power transmission and distribution systems. The two most commonly used accelerated aging tests are the application of rotating wheels and fog chambers. The paper first reviews the setup and the application of these two methods. The comparison of the two methods is a significant part of the paper...
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 investigation is dedicated to the development of a new class of nanostructured composite material from cycloaliphatic epoxy polymers with nanoclay and microsilica as the fillers and the analysis of the behavior associated in the inclined plane tracking test (IEC 60587). Composite materials with different weight percentages of fillers were prepared and subjected to electrical tracking according...
This paper proposes a method to distinguish the tracking process only in terms of voltage waveforms. Tracking is simulated using the IEC (International Electrotechnical Commission) 60112 method. The tracking process is observed in 5 stages - static state, discharge inception, discharge in progress, carbon formation, and tracking breakdown. The measured voltage waveforms are analyzed by two signal...
Utilities continue to experience electrically induced manhole events. Eighty-five percent of manhole events are caused by insulation breakdown, and 97% of the breakdowns occur on secondary cable insulation. The vast majority of manhole events involve only smoke, but a very small minority involve more serious phenomena. The restrictive conditions under which secondary cable insulation breakdown leads...
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