乾式架橋・三層同時押出（E-E方式）の6.6kV撤去CVケーブルの水トリー劣化調査

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: 2016/03/01

タイトル(英語): Investigation of Water Tree Degradation in Dry-cured and Extruded Three-layer (E-E Type) 6.6kV Removed XLPE Cables

著者名: 栗原　隆史（（一財）電力中央研究所），筒井　英司（四国電力（株）），中西　英治（（株）四国総合研究所），真木　清士（中国電力（株）），村川　健一（九州電力（株）），森本　光滋（関西電力（株）），高橋　俊裕（（一財）電力中央研究所），岡本　達希（（一財）電力中央研究所）

著者名(英語): Takashi Kurihara (Central Research Institute of Electric Power Industry), Eiji Tsutsui (Shikoku Electric Power Co., Inc.), Eiji Nakanishi (Shikoku Research Institute, Inc.), Kiyoshi Maki (The Chugoku Electric Power Co., Inc.), Kenichi Murakawa (Kyushu Electric Power Co., Inc.), Koji Morimoto (The Kansai Electric Power Co., Inc.), Toshihiro Takahashi (Central Research Institute of Electric Power Industry), Tatsuki Okamoto (Central Research Institute of Electric Power Industry)

キーワード: 高圧CVケーブル，三層同時押出，水トリー，破壊電圧，撤去品調査　　high voltage XLPE insulated cables，E-E type，water trees，breakdown voltage，investigation of removed cables

要約(英語): Dry-cured and extruded three-layer (E-E type) 6.6kV cross-linked polyethylene (XLPE) cables were introduced into electric power systems more than 30 years ago, but they do not experience failures because of water tree degradation. Also, the degradation index of water treeing for these cables has not been established. Therefore, investigating results of residual breakdown voltage and water tree degradation of these cables will help us plan for cable replacement and determine water tree degradation diagnosis scheduling, and will be fundamental data for cable lifetime evaluation. In this study, the authors measured the AC breakdown voltages of dry-cured and E-E type 6.6kV XLPE cables removed after 18-25 years of operation and observed the water trees in their XLPE insulation. As a result, it was observed that breakdown voltages were larger than the maximum operating voltage (6.9kV) and the AC voltage for the dielectric withstanding test (10.3kV). Water trees were mainly bow-tie water trees and their maximum length was approximately 1mm. Although the number of measured cables was limited, the lifetime of this type of cable was estimated to be approximately 40 years, even experiencing water immersion.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.136 No.3 （2016）

本誌掲載ページ: 333-343 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/136/3/136_333/_article/-char/ja/