Effect of Water on AC Breakdown Properties of Mineral Oil and Vegetable-oil-based Insulating Fluid

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  • Hiramatsu Yushi
    Department of Electrical and Electronic Engineering, Faculty of Science and Technology, Meijo University
  • Murakami Yuichi
    Department of Electrical and Electronic Engineering, Faculty of Science and Technology, Meijo University
  • Muramoto Yuji
    Department of Electrical and Electronic Engineering, Faculty of Science and Technology, Meijo University

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Other Title
  • 鉱油および植物系絶縁油の交流絶縁破壊特性に及ぼす水分の影響
  • コウユ オヨビ ショクブツケイ ゼツエンユ ノ コウリュウ ゼツエン ハカイ トクセイ ニ オヨボス スイブン ノ エイキョウ

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<p>This paper reports AC breakdown properties of the mineral oil / the vegetable-oil-based insulating fluid containing water and the movement of water-drops under AC electric field in those oils. These results were showed as the following: (i) AC electric strength (Fb) of the mineral oil decreased sharply over several tens ppm of water. Fb of the vegetable-oil-based insulating fluid also decreased with the increase of water amount, but the low degree of inclination that compared with that of the mineral oil was showed. (ii) The water-drops movement in the mineral oil was active, but that in the vegetable-oil-based insulating fluid displayed the gentle movement in contrast.</p>

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