Patents by Inventor Jun Nukaga
Jun Nukaga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11070039Abstract: An insulating spacer and a gas insulation shutoff apparatus each having a high dielectric strength against adhesion of a metal foreign substance are provided without increasing size or complicating a shape of the insulating spacer. In an insulating spacer of a gas insulation shutoff apparatus including a grounded tank filled with an insulating gas, a high-voltage conductor provided within the grounded tank, and the insulating spacer supporting and fixing the high-voltage conductor within the grounded tank, the insulating spacer includes a conductor to be connected to the high-voltage conductor, an insulating structure supporting and fixing the conductor within the grounded tank, and a nonlinear resistance layer provided on a creepage surface of the insulating structure, and the nonlinear resistance layer is provided in a portion to be a high-field portion of the creepage surface of the insulating structure.Type: GrantFiled: May 14, 2018Date of Patent: July 20, 2021Assignee: Hitachi, Ltd.Inventors: Hirokazu Furui, Jun Nukaga, Makoto Hirose
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Patent number: 10991529Abstract: An object is to enhance direct-current insulating performance of a gas-blast circuit breaker. The gas-blast circuit breaker includes: a pair of main contacts disposed in a gas tank to face each other and configured to operate for opening and closing a circuit; a pair of arc contacts disposed to face each other and configured to operate for opening and closing the circuit, the arc contacts being disposed coaxially with the main contacts at locations close to the centers of the main contacts, respectively; and an elastic electrically conductive material disposed on an outer surface of an insulating nozzle facing an inner surface of one of the main contacts.Type: GrantFiled: August 3, 2018Date of Patent: April 27, 2021Assignee: Hitachi, Ltd.Inventors: Hideyuki Kotsuji, Jun Nukaga, Makoto Hirose, Takahiro Nishimura
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Publication number: 20200279704Abstract: An object is to enhance direct-current insulating performance of a gas-blast circuit breaker. The gas-blast circuit breaker includes: a pair of main contacts disposed in a gas tank to face each other and configured to operate for opening and closing a circuit; a pair of arc contacts disposed to face each other and configured to operate for opening and closing the circuit, the arc contacts being disposed coaxially with the main contacts at locations close to the centers of the main contacts, respectively; and an elastic electrically conductive material disposed on an outer surface of an insulating nozzle facing an inner surface of one of the main contacts.Type: ApplicationFiled: August 3, 2018Publication date: September 3, 2020Inventors: Hideyuki KOTSUJI, Jun NUKAGA, Makoto HIROSE, Takahiro NISHIMURA
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Patent number: 10755442Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: January 12, 2018Date of Patent: August 25, 2020Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Publication number: 20200083678Abstract: An insulating spacer and a gas insulation shutoff apparatus each having a high dielectric strength against adhesion of a metal foreign substance are provided without increasing size or complicating a shape of the insulating spacer. In an insulating spacer of a gas insulation shutoff apparatus including a grounded tank filled with an insulating gas, a high-voltage conductor provided within the grounded tank, and the insulating spacer supporting and fixing the high-voltage conductor within the grounded tank, the insulating spacer includes a conductor to be connected to the high-voltage conductor, an insulating structure supporting and fixing the conductor within the grounded tank, and a nonlinear resistance layer provided on a creepage surface of the insulating structure, and the nonlinear resistance layer is provided in a portion to be a high-field portion of the creepage surface of the insulating structure.Type: ApplicationFiled: May 14, 2018Publication date: March 12, 2020Inventors: Hirokazu FURUI, Jun NUKAGA, Makoto HIROSE
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Patent number: 10234355Abstract: A leakage oil detection system includes a measurement device including a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process to detect leakage oil.Type: GrantFiled: July 8, 2016Date of Patent: March 19, 2019Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Akira Yamagishi, Yasutomo Saito
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Patent number: 10113933Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: GrantFiled: March 27, 2015Date of Patent: October 30, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Toshiaki Rokunohe, Tomohiro Moriyama, Jun Nukaga, Akira Yamagishi, Yasutomo Saito
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Patent number: 10090095Abstract: 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.Type: GrantFiled: April 12, 2017Date of Patent: October 2, 2018Assignee: HITACHI, LTD.Inventors: Li Lu, Kenichi Kawamura, Hiroshi Miyao, Hiroshi Morita, Satoshi Ichimura, Jun Nukaga, Shinji Fujita, Kohei Yamaguchi, Hideki Ogata, Masato Suzuki
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Publication number: 20180137652Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: January 12, 2018Publication date: May 17, 2018Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Patent number: 9898830Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: February 25, 2016Date of Patent: February 20, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Publication number: 20170301454Abstract: 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.Type: ApplicationFiled: April 12, 2017Publication date: October 19, 2017Applicant: HITACHI, LTD.Inventors: Li LU, Kenichi KAWAMURA, Hiroshi MIYAO, Hiroshi MORITA, Satoshi ICHIMURA, Jun NUKAGA, Shinji FUJITA, Kohei YAMAGUCHI, Hideki OGATA, Masato SUZUKI
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Publication number: 20170234762Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: ApplicationFiled: March 27, 2015Publication date: August 17, 2017Applicant: HITACHI, LTD.Inventors: Li LU, Toshiaki ROKUNOHE, Tomohiro MORIYAMA, Jun NUKAGA, Akira YAMAGISHI, Yasutomo SAITO
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Patent number: 9613762Abstract: 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.Type: GrantFiled: July 30, 2015Date of Patent: April 4, 2017Assignee: Hitachi, Ltd.Inventors: Jun Nukaga, Yoshio Hamadate, Tomohiro Moriyama, Yoshiaki Seya
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Publication number: 20170016796Abstract: There is provided a leakage oil detection system including: a measurement device that includes a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process.Type: ApplicationFiled: July 8, 2016Publication date: January 19, 2017Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20160275699Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: February 25, 2016Publication date: September 22, 2016Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20160049268Abstract: Magnetic force of a permanent magnet can be converted into arc driving force efficiently, and the permanent magnet can be insulated from arc heat so as to suppress magnetic deterioration, whereby breaking performance can be secured over a long period of time.Type: ApplicationFiled: March 7, 2014Publication date: February 18, 2016Applicant: Hitachi, Ltd.Inventors: Toshiaki ROKUNOHE, Tatsuro KATO, Jun NUKAGA, Tomohiro MORIYAMA, Kenji TSUCHIYA
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Publication number: 20160035501Abstract: 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.Type: ApplicationFiled: July 30, 2015Publication date: February 4, 2016Inventors: Jun NUKAGA, Yoshio HAMADATE, Tomohiro MORIYAMA, Yoshiaki SEYA
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Publication number: 20140360984Abstract: Compact lightweight gas insulated switchgear which assures sufficient electrode fixing strength equivalent to the fixing strength given by brazing and is structurally simple and enables efficient arc rotation with low operating energy. In the switchgear, a movable arcing contact is located on a movable element, opposite to a fixed arcing contact and electrically connected to, or disconnected from, the fixed arcing contact as the movable element moves. The movable arcing contact includes, in order from its tip opposite to the fixed arcing contact, a first electrode as a convex hollow coaxial cylindrical electrode, hollow coaxial cylindrical first spacer, and second electrode as a hollow coaxial cylindrical electrode and has electric conduction means to connect the first and second electrodes electrically through the first spacer. The first and second electrodes are fixed through the first spacer by a fixing member having higher resistivity than the first and second electrodes.Type: ApplicationFiled: June 4, 2014Publication date: December 11, 2014Applicant: HITACHI, LTD.Inventors: Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Masashi KAWAMATA
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Patent number: 7885381Abstract: The pipe inspection method and apparatus can be used to implement rapid, tomographic inspection of a pipe set up at a narrow location. The pipe inspection method includes: a first step for scanning the pipe by translating a radiation source and radiation detector arranged opposedly to the pipe; a second step for the radiation detector to detect radiation that the radiation source has emitted, at given scanning distance intervals; a third step for creating a transmission image of the pipe, based on a radiation dose that the radiation detector has detected; and a fourth step for constructing a tomogram or stereoscopic image of the pipe, based on the transmission image. Thus, it is possible to provide the pipe inspection method and apparatus that can be used to implement rapid, tomographic inspection of the pipe set up at a narrow location.Type: GrantFiled: April 23, 2008Date of Patent: February 8, 2011Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Yasushi Nagumo, Jun Nukaga, Hiroshi Kamimura, Noriyuki Sadaoka, Satoshi Takemori, Kojirou Kodaira
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Publication number: 20080267345Abstract: The pipe inspection method and apparatus can be used to implement rapid, tomographic inspection of a pipe set up at a narrow location. The pipe inspection method of the present invention includes: a first step for scanning the pipe by translating a radiation source and radiation detector arranged opposedly to the pipe; a second step for the radiation detector to detect radiation that the radiation source has emitted, at given scanning distance intervals; a third step for creating a transmission image of the pipe, based on a radiation dose that the radiation detector has detected; and a fourth step for constructing a tomogram or stereoscopic image of the pipe, based on the transmission image. According to this invention, it is possible to provide the pipe inspection method and apparatus that can be used to implement rapid, tomographic inspection of the pipe set up at a narrow location.Type: ApplicationFiled: April 23, 2008Publication date: October 30, 2008Inventors: Yasushi NAGUMO, Jun Nukaga, Hiroshi Kamimura, Noriyuki Sadaoka, Satoshi Takemori, Kojirou Kodaira