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In this paper, we carried out an optical measurement of electric field in transformer oil by using Kerr effect to discuss electric field and charge behavior in transformer oil induced by flow electrification. We constructed a system which consisted of electro-optic field measurement part and an oil flowing part. By using this system, we measured electric field in charged transformer oil. When charged oil flew into the measurement system without voltage application, electric field appeared in the oil. Particularly, when a pressboard was placed in the field measurement system, electric field appeared strongly because of charge accumulation on the pressboard. We discussed experimental results from the viewpoints of leakage current and the time constant of electric field relaxation in equivalent circuit. Finally, we investigated charge behavior in flowing transformer oil, and proposed a model which could explain charge behavior associated with the flow electrification. キ ー ワ ー ド:カ ー効 果,流 動 帯 電,変 圧 器 油,プ レ ス ボ ー ド (Kerr effect, Flow electrification. Transformer oil, Pressboard)

Optical Measurement of Electric Field and Charge Behavior Induced by Flow Electrification in Oil Immersed Insulating System