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In this paper, we measured electric field in transformer oil / pressboard composite system, using a Kerr electro-optic method to discuss electric field distribution and charge behavior induced by flow electrification. We investigated electric field in both uncharged and charged oil, under different flowing conditions. From the experiments, we could quantitatively estimate and analyze the time transition of electric field by charge accumulation on the pressboard. Finally, we could propose charge behavior model in flowing transformer oil .