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In this paper, the outline of the development history of HVDC cable with nanocomposite material is introduced. Nano-sized MgO-filler added into XLPE, which had been developed for HVDC cable insulation, was not investigated from the view point of nanocomposite material until 2001. Since then, nano-scale observation of the dispersion state of nano-sized MgO-filler in HVDC cable insulation has been carried out. It has been found that the dc material, which had been developed for 500 kV dc cable, is XLPE/MgO nanocomposite material in which nano-sized MgO homogeneously dispersed in nano-scale
Murata et al. (Thu,) studied this question.