Abstract
As DC transmission has been used widely, HVDC cables are the development direction of power grid in the future. Shielding materials for HVDC cables were prepared by mixing EEA with super conductive carbon black at different filling rates in this paper. Scanning electron microscope (SEM) was used to observe the morphology of carbon black particles in EEA. Volume resistivity, tensile properties and melt mass flow rate (MFR) of shielding materials were measured and analyzed. The pressure wave propagation (PWP) method was adopted to study space charge properties of shielding materials on XLPE insulation. Finally, recommended addition of super conductive carbon black was given. The results showed that super conductive carbon black in EEA existed in the state of long chains just like grapes rather than single particle and these long chains were well distributed. As addition of super conductive carbon black increased, volume resistivity, tensile properties and MFR of shielding materials decreased to different degree. The field enhancement factor (FEF) caused by space charges decreased gradually and tended to be invariant with super conductive carbon black increasing. Take all these properties into account, shielding materials with this type of super conductive carbon black at filling rates varying from 12 % to 15 % were enough to meet requirements.
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