OFケーブル油浸紙―絶縁油複合絶縁系の設計電界下における部分放電推移と劣化進展様相

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: 2015/04/01

タイトル(英語): Partial Discharge Characteristics and Degradation Progress of Oil Impregnated Insulation System with an Oil Gap at the Electric Field Adopted in the Design of OF Cables at 275kV Class

著者名: 岩下　雄宇（（一財）電力中央研究所電力技術研究所），牧野　裕太（（一財）電力中央研究所電力技術研究所），栗原　隆史（（一財）電力中央研究所電力技術研究所），高橋　俊裕（（一財）電力中央研究所電力技術研究所），岡本　達希（（一財）電力中央研究所電力技術研究所）

著者名(英語): Yuu Iwashita (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry), Yuuta Makino (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry), Takashi Kurihara (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry), Toshihiro Takahashi (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry), Tatsuki Okamoto (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry)

キーワード: OFケーブル，部分放電，劣化診断，油浸絶縁紙，油隙，劣化メカニズム　　oil filled cable，partial discharge，degradation diagnosis，oil impregnated insulation system，oil gap，degradation mechanism

要約(英語): Partial discharge (PD) characteristics and degradation mechanism of an oil-impregnated insulation system with an oil gap at the electric field adopted in the design of OF cables at 275kV class were investigated. First, we investigated its time transition of PD characteristics under a continuous alternating current (AC) voltage application. As a result, PDs continued with the AC voltage that was lower than that of the PD inception voltage and the test sample broke down after approximately 16 days. These results suggest that a certain amount of lead time is expected even when oil gaps are overlapped on the inner conductor or under the outer shield due to core movement of OF cables after lengthy operation and PDs continuously occur. Also, phase angle characteristics of PD charge magnitude (φ-q pattern) showed typical patterns of PDs in a void until before breakdown that changed just before that point. Therefore, φ-q patterns are useful for removing outer noises and for determining the occurrences of PDs in OF cable systems under operation. Finally, we observed insulation papers subjected PDs for certain time. As a result, carbonization due to PDs was found especially around the edge of an oil gap and a pin hole was formed in the carbonized area of the oil gap edge after more than 8 days. Based on this result, degradation progress and mechanism was discussed.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.135 No.4 （2015）

本誌掲載ページ: 265-271 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/135/4/135_265/_article/-char/ja/