Measurement and Three-Dimensional Computational Analysis for Flow Electrification in Complex-Shaped Ducts

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): Measurement and Three-Dimensional Computational Analysis for Flow Electrification in Complex-Shaped Ducts

著者名: Naoya Miyamoto (Hitachi, Ltd.), Makoto Koizumi (Hitachi, Ltd.), Hiroshi Miyao (Hitachi, Ltd.), Takayuki Kobayashi (Tokyo Electric Power Company, Inc), Kojiro Aoki (Tokyo Electric Power Company, Inc)

著者名(英語): Naoya Miyamoto (Hitachi, Ltd.), Makoto Koizumi (Hitachi, Ltd.), Hiroshi Miyao (Hitachi, Ltd.), Takayuki Kobayashi (Tokyo Electric Power Company, Inc), Kojiro Aoki (Tokyo Electric Power Company, Inc)

キーワード: transformer，flow electrification，leakage current，shear stress，measurement，three-dimensional analysis

要約(英語): The flow electrification phenomenon is known as a major cause of failures in oil-cooled power transformers. To improve the reliability of transformers, we need to be able to predict the electric field caused by flow electrification in a transformer. We developed a three-dimensional (3D) flow electrification simulation model to predict the wall current distributions in complex-shaped pressboard ducts that produce complicated oil flows. First, we derived a flow electrification analysis model, which reflects the correlation between local wall current density and local wall shear stress. This analysis model was verified by measured data of wall current density generated in a straight pressboard duct. Then, we applied this analysis model to 3D simulation code and simulated flow electrification in two types of channel structure, a T junction structure and a narrow oil gap structure, which represent typical structures that often appear in real transformers. We compared the simulation results with the measurement results and confirmed that the prediction accuracy of the simulation code is at the practical level for estimating flow electrification in a transformer.

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: 318-324 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/136/3/136_318/_article/-char/ja/