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High voltage equipment designed for DC applications is stressed differently from ac equipment. Most notably, the load conditions of the equipment play a major role in determining the electric field distribution in insulation under dc, due to the temperature dependence of conductivity. Additionally, polarization and space charge phenomena impose a time dependent behavior on the stress distribution...
Whatever our specific field of expertise, we all have to deal with interfaces, whether we are involved in designing the large interfaces in high voltage cable accessories or whether we try to tailor the interface properties on a very small scale in nanocomposites. Whereas many of us study the properties of new insulating materials and their bulk properties, this paper focuses on what we think we know...
In electrical insulating systems, breakdown is usually triggered by macroscopic defects or interfaces. The focus of this paper is on two phenomena that are of prime importance for understanding degradation and breakdown processes at DC voltage, i.e. partial discharge and space charge. An overview is given of the work that was performed in Delft, often in collaboration with other institutes, in the...
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