6.6kV E-T方式CVケーブルの水トリー劣化の加速要因と絶縁破壊過程に関する研究

カテゴリ: 論文誌(論文単位)

グループ名: 【B】電力・エネルギー部門

発行日: 2023/02/01

タイトル(英語): Study on the Acceleration Factors and Dielectric Breakdown Process of Water-tree Degradation in 6.6kV E-T Type XLPE Power Cables

著者名: 杉本　修（東京電設サービス（株）），永原　茂樹（東京電設サービス（株）），小山　勇人（東京電設サービス（株））

著者名(英語): Shu Sugimoto (Tokyo Densetsu Service Co., Ltd.), Shigeki Nagahara (Tokyo Densetsu Service Co., Ltd.), Hayato Koyama (Tokyo Densetsu Service Co., Ltd.)

キーワード: CVケーブル，水トリー，電気トリー，6.6kV，絶縁破壊，E-T方式　　XLPE power cable，water tree，electrical tree，6.6kV，dielectric breakdown，E-T type

要約(英語): Some 6.6kV XLPE Power Cables are E-T type with the external semi-conductive layer wrapped with tape. In the E-T type cables, there have been many dielectric breakdown accidents due to water-tree degradation. The cables with dielectric breakdown were investigated. As a result, the unbridged water-tree was the cause of the breakdown. All of those cables were less than ten years old. In other words, the process of dielectric breakdown and the speed at which the water-tree develops were different from the knowledge of the water-tree. In the knowledge, first, the time to dielectric breakdown is at least 10 years due to the water-tree degradation. Second, the water-tree does not causes dielectric breakdown immediately even if it is bridged. Finally, the bridged water-tree causes dielectric breakdown due to the subsequent abnormal voltage. Therefore, in this study, the factors that accelerate the growth of the water-tree and the dielectric breakdown process were investigated. As a result, the acceleration factor was confirmed to be the ion products from the materials in the semi-conductive tape. Moreover, the dielectric breakdown process was considered through the shape of the water-tree and the aspect of the electrical-tree generated at the origin of the water-tree.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.143 No.2 （2023） 特集：令和4年電力・エネルギー部門大会

本誌掲載ページ: 107-117 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/143/2/143_107/_article/-char/ja/