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公开(公告)号：US20190101521A1
公开(公告)日：2019-04-04
申请号：US16130308
申请日：2018-09-13
申请人： Hitachi, Ltd.
摘要： There is provided a diagnosing device for an on-load tap changing apparatus of a transformer, which can diagnose the degradation degree of insulating oil at high accuracy by a relatively simple device configuration. A diagnosing device for an on-load tap changing apparatus has an insulating oil tank in which insulating oil is sealed, a changeover switching device that is disposed within the insulating oil tank and performs the tap changing operation of a tap winding, a tap selector that selects the tap position of the tap winding, and a polarity (transposition) changer that inverts the polarity of the tap winding or a winding connected to the tap winding. The diagnosing device includes an arc discharge light detector that detects arc discharge light that is emitted at changing the tap position of the tap selector. The degradation degree of the insulating oil is diagnosed based on the arc discharge light detected by the arc discharge light detector.
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公开(公告)号：US20160035501A1
公开(公告)日：2016-02-04
申请号：US14813723
申请日：2015-07-30
申请人： Hitachi, Ltd.
发明人： Jun NUKAGA , Yoshio HAMADATE , Tomohiro MORIYAMA , Yoshiaki SEYA
CPC分类号： H01H1/385 , H01H1/60 , H01H3/62 , H01H2001/406
摘要： Disclosed is a power switch gear that includes: a fixed electrode and a movable electrode disposed opposite to each other in a tank filled with insulting gas; and a movable conductor electrically connecting the fixed electrode and the movable electrode together. The fixed electrode and the movable electrode have a contactor through which current flows to the movable conductor. At least one of the fixed electrode and the movable electrode has ring-shaped sliding members, the ring-shaped sliding members being disposed, on both sides of the contactor. At least one grease pool is provided between the contactor and the sliding members.
摘要翻译： 公开了一种功率开关装置，其包括：在填充有绝缘气体的罐中彼此相对设置的固定电极和可动电极; 以及将固定电极和可动电极电连接在一起的可动导体。 固定电极和可动电极具有电流流过可动导体的接触器。 固定电极和可动电极中的至少一个具有环形滑动构件，环形滑动构件设置在接触器的两侧。 在接触器和滑动构件之间至少设置一个油池。
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公开(公告)号：US20180204670A1
公开(公告)日：2018-07-19
申请号：US15850206
申请日：2017-12-21
申请人： Hitachi, Ltd.
发明人： Naoya MIYAMOTO , Yoshio HAMADATE , Akira YAMAGISHI , Mao KAWAMOTO
CPC分类号： H01F27/343 , H01F3/14 , H01F27/025 , H01F27/06 , H01F27/12 , H01F27/2885 , H01F27/289 , H01F27/323 , H01F27/324 , H01F27/346 , H01F27/362
摘要： A stationary induction apparatus includes a main body tank and a stationary induction apparatus main body. The main body is accommodated in the tank. An electrostatic shield ring is placed on the upper and lower end parts of a winding. An electrostatic shield ring has a magnetic ring and two insulating rings vertically fixing the magnetic ring for a spool. A conductive tape is laid on an insulating tape. These tapes are wound around the spool. An insulating tape is wound around the wound tapes. The width of the insulating tape is equal to or greater than the width of the conductive tape. One end of the conductive tape is connected to one end part of the winding and to the magnetic ring. A gap is provided at at least one place on the magnetic ring. The winding direction of the conductive tape is inverted at at least one place.
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公开(公告)号：US20180068785A1
公开(公告)日：2018-03-08
申请号：US15683104
申请日：2017-08-22
申请人： HITACHI, LTD.
摘要： To provide a safe stationary induction electrical apparatus that prevents a fragment coming off a magnetic shield, wound around an iron core leg portion of the stationary induction electrical apparatus, due to vibrations from being released in a tank accommodating the stationary induction electrical apparatus and thus prevents a trouble such as dielectric breakdown. Moreover, to provide a stationary induction electrical apparatus that does not need to be changed in the dimensions of an iron core for securing an insulation distance due to the placement of a magnetic shield and can reduce a compressive force generated in a winding. A magnetic material is provided in the interiors of insulating members whose interiors are hollow and which are provided in the vicinities of upper and lower ends of the winding wound around the iron core leg portion of the stationary induction electrical apparatus.
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