報告書番号

W92023

タイトル（和文）

超低密度ポリエチレンによるＣＶケーブル絶縁体の耐水トリー性の向上

タイトル（英文）

Improvement of Water Tree Retardancy of XLPE Cables Using Very Low-Density Polyethyle

概要 （図表や脚注は「報告書全文」に掲載しております）

概要 （英文）

The objective of this research work is to find and evaluate the cable insulation materials that have a good water tree retardation.Water tree region in polyethylene was observed by transmission electron microscope.It was shown that the water tree is composed of micro voids that tends to grow parallel to lamella structure.This suggests the possibility of upgrading water tree retardation by changing morphology.Several samples of deferent morphology were subjected to water tree test.Among these samples,"very low density polyethlene(VLDPE)"showed the best water tree retardation.To evaluate water tree condition of these samples non-destructively,space charge distribution was measured by applying DC voltage.A good correlation was seen among water tree degradation and space charge accumulation properties.

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