Abstract
The insulation characteristics of HVDC cable factory joint are essential for the stable and efficient operation of power system. This paper analyzes the electric properties of materials interface in high voltage direct current (HVDC) cable factory joint. 500 kV XLPE pellets were used to prepare disc-shaped films by hot pressing. Then, 80, 400, 1000 and 2000 grit mesh sandpapers are used to polish the surface of the degassed film, respectively. Finally, XLPE pellets are hot pressed on the polished surface to produce the samples. Space charge distributions, electrical conductivity and DC breakdown strength of XLPE samples with different roughness were studied. The results show an homo charge accumulation near both electrodes with the different interface roughness. Furthermore, the samples of the interface polished by 1000 grit mesh show the largest electrical conductivity. Moreover, its space charge densities, electric field distortion and breakdown strength are the smallest among all the samples. It can be found that there may be a minimum breakdown strength and space charge accumulation between the grit mesh of 400 and 2000. Moreover, the space charge accumulation cannot be completely suppressed with the increase of interface smoothness. It can be inferred that ultra-smooth interface contributes to increase the breakdown strength of the samples.
Published Version
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