鉱油中における熱および課電加速劣化したポリビニルホルマール線の絶縁特性

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: 2023/03/01

タイトル(英語): Electrical Insulation Properties of Polyvinyl Formal Wire in Mineral Oil Under Thermal and Electrical Accelerated Aging

著者名: 善田　優希（九州工業大学），小迫　雅裕（九州工業大学），匹田　政幸（九州工業大学），大久保　祐輔（（株）ダイヘン），下村　好亮（（株）ダイヘン），田中　剛（（株）ダイヘン）

著者名(英語): Yuki Zenda (Kyushu Institute of Technology), Masahiro Kozako (Kyushu Institute of Technology), Masayuki Hikita (Kyushu Institute of Technology), Yusuke Okubo (DAIHEN Corporation), Kosuke Shimomura (DAIHEN Corporation), Takeshi Tanaka (DAIHEN Corporation)

キーワード: 柱上変圧器，PVF線，絶縁油，部分放電，絶縁破壊，油中水分量_x000D_　　pole transformer，PVF wire，insulating oil，partial discharge，breakdown，water content in insulating oil

要約(英語): This paper deals with partial discharge inception voltage (PDIV) and long-term voltage-time (V-t) characteristics of Polyvinyl Formal (PVF) wires in mineral oil under thermal and electrical aging. The reliability of the long-term insulation performance was evaluated considering the thermal aging of PVF wire and the aging due to humidification of the insulating oil. The results showed that PDIV decreases with an increase in the temperature of heat treatment in the oil. It was also found that the lifetime of specimens subjected to the thermal aging up to 180℃ was reduced compared to that of non-treated specimens. In order to examine the reduction in the long-term charge life of thermally aged specimens, chemical analysis was performed using a Fourier transform infrared spectrometer (FT-IR). The results suggest that the decrease in the long-term voltage application lifetime of the thermally aged specimens is caused by the low molecular weight of the PVF wire coating due to thermal aging. From the above experimental results and discussion, it was concluded that the PVF wire thermally aged at 180℃ for 2 months, which corresponds to 60 years of operation according to the 10℃ half-life law, maintains sufficient insulation performance at 1 kV stressed to the coatings and can be expected to have a service life of more than 30 years.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.143 No.3 （2023）

本誌掲載ページ: 98-104 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/143/3/143_98/_article/-char/ja/