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Influence of the Electric Field and Temperature on Space Charge in DC Cable Joints

Space charge behavior in cross-linked polyethylene (XLPE), ethylene-propylene rubber (EPR) and multi-layered XLPE/EPR subjected to electric field and temperature has been investigated using the pulsed electro acoustic (PEA) technique. A dual-layer structure constituted of two flat sheets, where one is XLPE and the other is EPR was used to study the charging properties of the electrode/dielectric and dielectric/dielectric interfaces. The time dependence of the space charge distribution was recorded at different temperatures and fields and short circuit condition. The results show that the increase of the electric field leads to an increase of the space charge density values, and the increase of temperature leads to an increase of the space charge density in the entire sample, excepting the area near the ground electrode.