公开(公告)号：US20200219646A1

公开(公告)日：2020-07-09

申请号：US16638005

申请日：2018-05-15

Applicant: Hitachi, Ltd.

Inventor： Satoshi ICHIMURA ,  Daigo KOMESU ,  Shinji FUJITA ,  Hiroshi MORITA ,  Li LU

IPC: H01F27/28 ,  H01F27/32 ,  H01F27/36

Abstract: An object of the present invention is to provide a stationary induction electric apparatus that can improve insulating performance with a few additional structures. In the stationary induction electric apparatus comprising: an iron core 1; a low-voltage coil conductor 400 wound on the iron core; an insulator 3 enclosing the low-voltage coil conductor; and a high-voltage coil conductor 2 which is wound on the insulator and to which a voltage is applied from the outside, a first shield conductor 5 wound adjacent to the inner peripheral surface of the insulator, a second shield conductor 4 wound adjacent to the outer peripheral surface of the insulator, one end of the first shield conductor, and one end of the second shield conductor are electrically connected to any region of the high-voltage coil conductor.

公开(公告)号：US20230317318A1

公开(公告)日：2023-10-05

申请号：US18022328

申请日：2021-08-06

Applicant: HITACHI, LTD.

Inventor： Shinji FUJITA ,  Yota ICHIKI ,  Motomune KODAMA ,  Tsuyoshi WAKUDA

IPC: H01B12/08 ,  H01B1/02

CPC classification number: H01B12/08 ,  H01B1/02

Abstract: In the connection portion for a superconducting wire, a plurality of superconducting wires are integrated by a sintered body containing MgB2, end portions of the superconducting wires each having an outer peripheral surface of a superconducting filament exposed are inserted into a container in parallel. The container has an opening having a diameter larger than a wire diameter of the superconducting wires on at least one side in a longitudinal direction of the superconducting wires, and the sintered body is in contact with the outer peripheral surfaces of the superconducting filaments. The method for connecting a superconducting wire includes: exposing the outer peripheral surfaces of the superconducting filaments; inserting the superconducting wires into the container; filling the container with a raw material; and heat-treating the raw material to generate the sintered body. The raw material is pressurized in parallel to the longitudinal direction of the superconducting wires and then heat-treated.

公开(公告)号：US20170301454A1

公开(公告)日：2017-10-19

申请号：US15485855

申请日：2017-04-12

Applicant: HITACHI, LTD.

Inventor： Li LU ,  Kenichi KAWAMURA ,  Hiroshi MIYAO ,  Hiroshi MORITA ,  Satoshi ICHIMURA ,  Jun NUKAGA ,  Shinji FUJITA ,  Kohei YAMAGUCHI ,  Hideki OGATA ,  Masato SUZUKI

IPC: H01F27/28

CPC classification number: H01F27/289 ,  H01F27/2823 ,  H01F27/2871 ,  H01F27/2876 ,  H01F27/323

Abstract: A stationary induction electrical apparatus includes a disc winding having a structure in which a flow path for a cooling medium is provided between coils where a low voltage is generated between shield wires, an L-shaped insulation barrier is provided between coils where a high voltage is generated between the shield wires, a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, a tip end portion in an axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to a pressboard insulation cylinder, and a height of the tip end portion in the axial direction is lower than a thickness of one coil.

公开(公告)号：US20210272722A1

公开(公告)日：2021-09-02

申请号：US17186223

申请日：2021-02-26

Applicant: HITACHI, LTD.

Inventor： Shinji FUJITA ,  Tsuyoshi WAKUDA ,  Yota ICHIKI ,  Motomune KODAMA

IPC: H01B12/02 ,  H01L39/02 ,  H01L39/14 ,  H01R4/68

Abstract: A superconducting wire connector includes superconducting wires and a sintered body containing MgB2. The superconducting wires are connected by the sintered body. At least one of the superconducting wires includes a superconducting core having a first outer surface. The sintered body is in contact with the first outer surface. A method of connecting superconducting wires by a sintered body containing MgB2 includes exposing a superconducting core of at least one of the superconducting wires by removing a portion, positioned in the middle in a longitudinal direction of the at least one of the superconducting wires, of a metal sheath disposed around the superconducting core, disposing the at least one of the superconducting wires through a container, filling the container with a raw material of MgB2, and forming the sintered body being in contact with an outer surface of the superconducting core by sintering the raw material filled in the container.

公开(公告)号：US20240045009A1

公开(公告)日：2024-02-08

申请号：US18267504

申请日：2021-12-23

Applicant: HITACHI, LTD.

Inventor： Motomune KODAMA ,  Yota ICHIKI ,  Shinji FUJITA

IPC: G01R33/3815 ,  G01R33/28 ,  G01R33/38

CPC classification number: G01R33/3815 ,  G01R33/288 ,  G01R33/3804

Abstract: A superconducting magnet apparatus includes a superconducting coil, a persistent current switch, a cryostat, an external resistance element that attenuates energy accumulated in the superconducting coil when the superconducting coil is demagnetized, an external power supply capable of energizing a reverse current of a persistent current to the superconducting coil, and a circuit breaker capable of freely cutting off energization between the external power supply and the superconducting coil. A method for demagnetizing a superconducting magnet includes causing the reverse current of the persistent current to flow from the external power supply, and switching the persistent current switch to an off-state and switching the circuit breaker to an off-state, and demagnetizing the superconducting magnet by causing a current flowing through the superconducting coil to flow to an external resistance element when the amount of current flowing through the persistent current switch decreases.