光学的電界測定による変圧器油/プレスボード複合系電界分布の温度特性に対する検討

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  • Study on Temperature Dependence of electric Field Distribution in Transformer Oil/Pressboard Composite Insulation System by Optical Measurement of Electric Field
  • コウガクテキ デンカイ ソクテイ ニ ヨル ヘンアツキユ プレスボード フクゴ

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We measured an electric field in transformer oil / pressboard composite insulation system under dc voltage application using Kerr electro-optic measurement system. When a pressboard was inserted between two parallel-plane electrodes, the electric field between the pressboard and the cathode decreased monotonously with time. On the other hand, the electric field between the pressboard and the anode increased with time, reached a maximum value and then fell down. In this paper, we measured an electric field at different temperature of transformer oil and discussed the mechanism by charge accumulation model and potential distribution considering the difference in charge accumulation rate on the pressboard between positive and negative charges.

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