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公开(公告)号：US09711274B2
公开(公告)日：2017-07-18
申请号：US14743680
申请日：2015-06-18
申请人： Hitachi, Ltd.
发明人： Taku Oyama , Takahide Matsuo , Kenichi Kawamura , Akira Yamagishi
CPC分类号： H01F27/33 , H01F27/245 , H01F27/263 , H01F27/324
摘要： The invention provides a stationary induction apparatus excellent in core vibration damping, being capable of realizing reduction in core excitation-noise. The stationary induction apparatus according to the invention includes a core made up of plural of core-legs formed by lamination of electromagnetic steel sheets, and a core-yoke formed by lamination of electromagnetic steel sheets to join the plural core-legs together; a core-tightening clasp for tightening a joint between the core-yoke and the core-legs, in the direction of the lamination of the electromagnetic steel sheets, to be secured, a winding, a tank, and an insulating sheet disposed between the core-tightening clasp and the core-yoke. Further, a concave hollowed-out part or a notched part is provided on the insulating sheet, positioned at a joint between the core-yoke and the core-leg, and a vibration insulator is disposed in the concave hollowed-out part or the notched part.
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公开(公告)号：US09812250B2
公开(公告)日：2017-11-07
申请号：US14738993
申请日：2015-06-15
申请人： Hitachi, Ltd.
发明人： Yasunori Ono , Takahide Matsuo , Naoya Miyamoto , Taku Oyama , Kentaro Koseki , Ryoji Hirobe
CPC分类号： H01F27/365 , H01F27/02 , H01F2027/348
摘要： While the whole weight of magnetic shields provided in a tank of a transformer is reduced, eddy current loss by magnetic flux leaked from a winding is reduced. A transformer is configured using an iron core having an iron core leg and an iron core yoke, windings wound around the iron core leg, a tank having the iron core and the windings therein, and a first magnetic shield and second magnetic shields formed by laminating silicon steel sheets inside the tank. The first magnetic shield is arranged opposite to the windings, the second magnetic shields are arranged between the first magnetic shield and the tank, and the first magnetic shield and the second magnetic shields are fixed to the tank by different support members.
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