電力ケーブルの水トリー劣化位置標定に関する基礎検討

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2015/07/01

タイトル(英語): Fundamental Study for Locating Water Tree Degradation in XLPE Cables

著者名: 金　明煥（豊橋技術科学大学），村上　義信（豊橋技術科学大学），長尾　雅行（豊橋技術科学大学），穂積　直裕（豊橋技術科学大学），栗原　隆史（（一財）電力中央研究所），岡本　達希（（一財）電力中央研究所），内田　克己（中部電力（株）），辻　泰三（中部電力（株））

著者名(英語): MyongHwan Kim (Toyohashi University of Technology), Yoshinobu Murakami (Toyohashi University of Technology), Masayuki Nagao (Toyohashi University of Technology), Naohiro Hozumi (Toyohashi University of Technology), Takashi Kurihara (Central Research Institute of Electric Power Industry), Tatsuki Okamoto (Central Research Institute of Electric Power Industry), Katsumi Uchida (Electric Power R & D Center, Chubu Electric Power Co., Inc.), Taizo Tsuji (Electric Power R & D Center, Chubu Electric Power Co., Inc.)

キーワード: 電力ケーブル，劣化診断，水トリー，残留電荷法　　power cable，diagnosis，water tree，residual charge method

要約(英語): Water tree is a significant degradation mode of power cable with polymeric insulation. As those installed long time ago is supposed to be degraded with water trees, their diagnosing technique is being required for effective replacement. Especially locating the degraded region along the length would be helpful, since only a part of the cable line is usually degraded. As inside of the water tree is filled with trap sites, it is polarized with a certain distribution of relaxation time when a DC poling voltage is applied. Although its depolarization process after removing the poling voltage is determined by ambient temperature, applying a “depolarizing voltage” with the opposite polarity can accelerate the process. If a short pulse propagating through the cable is employed as a depolarization voltage, we may locate the water tree through looking at the time-resolved pulse response. This would lead to a diagnosing method with spatial resolution. In order to retain 100 m of spatial resolution, the response should be as sharp as 1 µs. As a preliminary study, a coaxial communication cable was employed as the specimen. An experiment using 405 m-long cable, with 5 m of degraded length in the middle, was performed. Two cables, one of which included degradation and the other did not, were oppositely coupled with a current transformer in order to cancel a rush current when the pulse voltage was applied. A sharp current response was observed, suggesting that a rapid depolarization took place. No such response was seen when the cable specimen was not applied with a poling bias voltage. The spatial resolution was equivalent to 50 m. We concluded that the technique is quite feasible.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.135 No.7 （2015） 特集：電気機器の低損失・高効率化に向けた電力用磁性材料の評価活用技術

本誌掲載ページ: 424-430 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/ieejfms/135/7/135_424/_article/-char/ja/