Space Charge Distributions in Two-layered LDPE/MgO Nanocomposites Exhibiting Superior Insulation Performance

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  • ２層誘電体構成の空間電荷分布が示すＬＤＰＥ／ＭｇＯナノコンポジットの良好な絶縁性
  • 2ソウ ユウデンタイ コウセイ ノ クウカン デンカ ブンプ ガ シメス LDPE MgO ナノコンポジット ノ リョウコウ ナ ゼツエンセイ

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Recently polymer nanocomposite has been attracting much attention as an emerging insulating material. In this paper, we measured space charge distributions for two-layered dielectric films consisting of certain combination of low-density polyethylene (LDPE) and its nanocomposite with magnesia nano-fillers during the application of dc electric field of 25 kV/mm or 100 kV/mm. Both at room temperature and 50°C, space charge is formed at the interface of two different materials to maintain the continuity of current when the electric field is 25 kV/mm, while packet-like charge appears only in the LDPE when the electric field is 100 kV/mm. These phenomena are explained by assuming that the nano-fillers effectively suppress the increase in conductivity induced by the high electric field.

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