Patents by Inventor Manabu Yoshimura

Manabu Yoshimura 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).

  • Patent number: 10317451
    Abstract: A partial discharge detection apparatus detects a plurality of discharge events, finds a time interval between the plurality of discharge events, and determines, where the discharge events occur at a time interval shorter than a threshold time, that a partial discharge has occurred within a metal enclosure, or determines, where the discharge events occur only at a time interval longer than the threshold time, that a discharge has occurred outside the metal enclosure. The partial discharge detection apparatus can thus readily distinguish between a partial discharge that occurs within the metal enclosure of a gas-insulated switchgear and a discharge that occurs outside the metal enclosure.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: June 11, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Manabu Yoshimura, Tatsuya Yabe, Takashi Ito
  • Publication number: 20190144703
    Abstract: A coating material of the present invention includes an insulating resin, and dispersion particles dispersed in the insulating resin. The dispersion particle includes a core particle containing zinc oxide as a main component and having nonlinear resistance, and a resin layer covering the surface of the core particle and having an average thickness being less than or equal to 5.0 ?m. The coating material of the present invention is a coating material for coating an inner surface of a ground tank of a gas insulated switchgear.
    Type: Application
    Filed: April 6, 2017
    Publication date: May 16, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoru SATO, Naoki YASUDA, Nobuo YOKOMURA, Ryoko KAWANO, Manabu YOSHIMURA, Shinichiro NAKAUCHI
  • Publication number: 20190109507
    Abstract: A stator coil accommodated in a slot of a rotary electric machine includes a coil conductor, a main insulating layer, a low resistance corona shield layer, and a stator coil extending outside the slot is provided with a first stator coil at the end of the low resistance corona shield layer has a first nonlinear resistance layer and a second nonlinear resistance layer partially overlapping with an end of the first nonlinear resistance layer, and a lower limit value of an electric resistivity of the second nonlinear resistance layer in a predetermined electric field is larger than an upper limit value of an electric resistivity of the first nonlinear resistance layer by one order of magnitude or more.
    Type: Application
    Filed: November 24, 2016
    Publication date: April 11, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro UMEMOTO, Yasutomo OTAKE, Manabu YOSHIMURA, Takashi NADA, Makoto TSUKIJI
  • Patent number: 10256611
    Abstract: A gas electrical apparatus includes: a container filled with insulating gas; a high voltage conductor arranged inside the container and applied with a prescribed voltage; and an insulating support member configured to insulate and support the high voltage conductor relative to the container. The high voltage conductor is covered by a first dielectric film. The first dielectric film includes a through hole extending from the first main surface to the second main surface. The through hole has an inner circumferential surface on which a first coating film is formed such that at least a hole diameter of the through hole is less than a diameter of an electron avalanche in a state where a gas insulated electrical apparatus is used.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: April 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Manabu Yoshimura, Shinichiro Nakauchi, Hitoshi Sadakuni, Shuhei Akashi, Hiroyuki Hama
  • Publication number: 20190058308
    Abstract: In a connecting device of an electrical apparatus in which a first solid insulator and a second solid insulator each molded as a solid insulator on a periphery of a center conductor are connected to each other via a flexible insulator, a high voltage electrode having an outer diameter larger than those of the center conductors is disposed in the second solid insulator, and a ground electrode having an inner diameter smaller than that of an outer ground layer of the second solid insulator and larger than the outer diameter of the high voltage electrode is disposed in the first solid insulator. Electric field directions at an interface between the first solid insulator and the flexible insulator and at an interface between the second solid insulator and the flexible insulator are directions along the respective interfaces.
    Type: Application
    Filed: September 30, 2016
    Publication date: February 21, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasutomo OTAKE, Takahiro UMEMOTO, Manabu YOSHIMURA, Katsushi NAKADA
  • Patent number: 10209292
    Abstract: A partial discharge determination method and apparatus, and a partial discharge determination system capable of indicating how much margin is left before dielectric breakdown, in a lighting impulse withstand voltage test, and a power device for which whether partial discharge is caused is determined by them, and a method for manufacturing a power device including the partial discharge determination method. A low-pass filter receives an acoustic signal resulting from application of an impulse voltage and acquired by an acoustic emission sensor, and removes an electromagnetic noise superimposed on the acoustic signal. A mechanical oscillation removal unit removes a mechanical oscillation component of a device under test, from the acoustic signal resulting from application of the impulse voltage which is a high voltage, based on the mechanical oscillation component acquired in advance and included in the acoustic signal resulting from application of the impulse voltage which is a low voltage.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Umemoto, Soichiro Kainaga, Manabu Yoshimura, Kazuaki Aono
  • Patent number: 10096979
    Abstract: A gas-insulated electrical device includes a covering film covering an inner surface of a ground tank filled with an insulation gas. The covering film is formed of an insulation dielectric covering film that becomes more positively charged than metals in a triboelectric series, and becomes positively charged upon contact with metal foreign matter. At the same time, the metal foreign matter becomes negatively charged upon contact with the covering film. In a case where the high-voltage conductor is charged to a negative polarity, a Coulomb's force acts on the metal foreign matter in contact with the covering film in a direction away from the high-voltage conductor. The metal foreign matter in the ground tank is thus suppressed from floating.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: October 9, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Manabu Yoshimura, Takashi Miyamoto, Soichiro Kainaga, Hitoshi Sadakuni
  • Patent number: 10069285
    Abstract: A gas-insulated switchgear includes a grounded tank filled with insulation gas, a center conductor which is disposed in the grounded tank and to which a voltage is applied, an insulating support member which insulates and supports the center conductor, and a nonlinear resistive part disposed at least on a vertically lower side inner surface of the grounded tank and formed by an insulation material containing a nonlinear resistive material. If an electric field applied to the nonlinear resistive part is higher than an electric field value in a vicinity of a contact point between the nonlinear resistive part and a metallic foreign substance mixed in the grounded tank during an operation, a resistivity of the nonlinear resistive part at the center conductor side is lower than a resistivity at which a discharge delay time is equal to an electric field relaxation time constant.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: September 4, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Soichiro Kainaga, Ryoko Kawano, Manabu Yoshimura, Takao Tsurimoto, Shinichiro Nakauchi
  • Patent number: 10043621
    Abstract: A non-linear resistance film including an insulating material and a non-linear resistance material is provided on an inner surface of a grounded tank. The non-linear resistance film is formed to contain a larger amount of the non-linear resistance material on a side of a central conductor than on a side of the grounded tank. Accordingly, a gas insulated switchgear that can suppress partial discharge around metallic foreign matters and also can suppress inflow of charges from the grounded tank to the metallic foreign matters can be provided.
    Type: Grant
    Filed: October 2, 2014
    Date of Patent: August 7, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Soichiro Kainaga, Manabu Yoshimura, Takao Tsurimoto, Shinichiro Nakauchi
  • Patent number: 10033169
    Abstract: A first opposing surface inclination angle of a protruding first solid insulating material of a first high-voltage device is smaller than a second opposing surface inclination angle of a dented second solid insulating material of a second high-voltage device. A hollow truncated-cone flexible insulating material of which the thickness before insertion between the first high-voltage device and the second high-voltage device is the same at every part and the elasticity modulus gradually increases from a small-diameter side toward a large-diameter side, or a hollow truncated-cone flexible insulating material of which the thickness before insertion gradually increases from a small-diameter side toward a large-diameter side and the elasticity modulus is the same at every part, is compressed and sandwiched between the first solid insulating material and the second solid insulating material.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: July 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Umemoto, Yasutomo Otake, Manabu Yoshimura, Katsushi Nakada
  • Patent number: 9972987
    Abstract: Provided is a gas insulation device that includes a grounded metal tank in which an insulation gas is encapsulated; a conductor which is provided in the tank, on a surface of which an alumite film on which sealing treatment is performed is formed, and across which a voltage is applied; an insulating coat provided on an inner surface of the tank; and a coat that is provided on the coat and that includes an insulation material containing a non-linear resistive material.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: May 15, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichiro Nakauchi, Manabu Yoshimura
  • Publication number: 20180034251
    Abstract: A first opposing surface inclination angle of a protruding first solid insulating material of a first high-voltage device is smaller than a second opposing surface inclination angle of a dented second solid insulating material of a second high-voltage device. A hollow truncated-cone flexible insulating material of which the thickness before insertion between the first high-voltage device and the second high-voltage device is the same at every part and the elasticity modulus gradually increases from a small-diameter side toward a large-diameter side, or a hollow truncated-cone flexible insulating material of which the thickness before insertion gradually increases from a small-diameter side toward a large-diameter side and the elasticity modulus is the same at every part, is compressed and sandwiched between the first solid insulating material and the second solid insulating material.
    Type: Application
    Filed: March 28, 2016
    Publication date: February 1, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro UMEMOTO, Yasutomo OTAKE, Manabu YOSHIMURA, Katsushi NAKADA
  • Publication number: 20170363675
    Abstract: A partial discharge determination method and apparatus, and a partial discharge determination system capable of indicating how much margin is left before dielectric breakdown, in a lighting impulse withstand voltage test, and a power device for which whether partial discharge is caused is determined by them, and a method for manufacturing a power device including the partial discharge determination method. A low-pass filter receives an acoustic signal resulting from application of an impulse voltage and acquired by an acoustic emission sensor, and removes an electromagnetic noise superimposed on the acoustic signal. A mechanical oscillation removal unit removes a mechanical oscillation component of a device under test, from the acoustic signal resulting from application of the impulse voltage which is a high voltage, based on the mechanical oscillation component acquired in advance and included in the acoustic signal resulting from application of the impulse voltage which is a low voltage.
    Type: Application
    Filed: December 8, 2015
    Publication date: December 21, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro UMEMOTO, Soichiro KAINAGA, Manabu YOSHIMURA, Kazuaki AONO
  • Publication number: 20170194773
    Abstract: A gas electrical apparatus includes: a container filled with insulating gas; a high voltage conductor arranged inside the container and applied with a prescribed voltage; and an insulating support member configured to insulate and support the high voltage conductor relative to the container. The high voltage conductor is covered by a first dielectric film. The first dielectric film includes a through hole extending from the first main surface to the second main surface. The through hole has an inner circumferential surface on which a first coating film is formed such that at least a hole diameter of the through hole is less than a diameter of an electron avalanche in a state where a gas insulated electrical apparatus is used.
    Type: Application
    Filed: November 13, 2014
    Publication date: July 6, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Manabu YOSHIMURA, Shinichiro NAKAUCHI, Hitoshi SADAKUNI, Shuhei AKASHI, Hiroyuki HAMA
  • Publication number: 20170194775
    Abstract: A gas-insulated switchgear includes a grounded tank filled with insulation gas, a center conductor which is disposed in the grounded tank and to which a voltage is applied, an insulating support member which insulates and supports the center conductor, and a nonlinear resistive part disposed at least on a vertically lower side inner surface of the grounded tank and formed by an insulation material containing a nonlinear resistive material. If an electric field applied to the nonlinear resistive part is higher than an electric field value in a vicinity of a contact point between the nonlinear resistive part and a metallic foreign substance mixed in the grounded tank during an operation, a resistivity of the nonlinear resistive part at the center conductor side is lower than a resistivity at which a discharge delay time is equal to an electric field relaxation time constant.
    Type: Application
    Filed: July 16, 2015
    Publication date: July 6, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Soichiro KAINAGA, Ryoko KAWANO, Manabu YOSHIMURA, Takao TSURIMOTO, Shinichiro NAKAUCHI
  • Publication number: 20170149226
    Abstract: Provided is a gas insulation device that includes a grounded metal tank in which an insulation gas is encapsulated; a conductor which is provided in the tank, on a surface of which an alumite film on which sealing treatment is performed is formed, and across which a voltage is applied; an insulating coat provided on an inner surface of the tank; and a coat that is provided on the coat and that includes an insulation material containing a non-linear resistive material.
    Type: Application
    Filed: June 25, 2014
    Publication date: May 25, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichiro NAKAUCHI, Manabu YOSHIMURA
  • Publication number: 20170069448
    Abstract: A non-linear resistance film including an insulating material and a non-linear resistance material is provided on an inner surface of a grounded tank. The non-linear resistance film is formed to contain a larger amount of the non-linear resistance material on a side of a central conductor than on a side of the grounded tank. Accordingly, a gas insulated switchgear that can suppress partial discharge around metallic foreign matters and also can suppress inflow of charges from the grounded tank to the metallic foreign matters can be provided.
    Type: Application
    Filed: October 2, 2014
    Publication date: March 9, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Soichiro KAINAGA, Manabu YOSHIMURA, Takao TSURIMOTO, Shinichiro NAKAUCHI
  • Patent number: 9508507
    Abstract: Gas insulated electrical equipment includes: a metal enclosure having an insulating gas introduced therein; a conductor that is accommodated inside the metal enclosure and to which voltage is applied; and an insulating and supporting member insulating and supporting the conductor relative to the metal enclosure. The conductor is circumferentially covered with a dielectric film, and furthermore, a nonlinear resistance film provided on the dielectric film and having a nonlinear volume resistivity decreasing when the nonlinear resistance film is acted on by an electric field higher than a critical value.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: November 29, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Manabu Yoshimura, Takashi Miyamoto, Soichiro Kainaga, Tsuyoshi Mori, Hitoshi Sadakuni
  • Publication number: 20160268784
    Abstract: A gas-insulated electrical device includes a covering film covering an inner surface of a ground tank filled with an insulation gas. The covering film is formed of an insulation dielectric covering film that becomes more positively charged than metals in a triboelectric series, and becomes positively charged upon contact with metal foreign matter. At the same time, the metal foreign matter becomes negatively charged upon contact with the covering film. In a case where the high-voltage conductor is charged to a negative polarity, a Coulomb's force acts on the metal foreign matter in contact with the covering film in a direction away from the high-voltage conductor. The metal foreign matter in the ground tank is thus suppressed from floating.
    Type: Application
    Filed: June 3, 2014
    Publication date: September 15, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Manabu YOSHIMURA, Takashi MIYAMOTO, Soichiro KAINAGA, Hitoshi SADAKUNI
  • Publication number: 20150355256
    Abstract: A partial discharge detection apparatus detects a plurality of discharge events, finds a time interval between the plurality of discharge events, and determines, where the discharge events occur at a time interval shorter than a threshold time, that a partial discharge has occurred within a metal enclosure, or determines, where the discharge events occur only at a time interval longer than the threshold time, that a discharge has occurred outside the metal enclosure. The partial discharge detection apparatus can thus readily distinguish between a partial discharge that occurs within the metal enclosure of a gas-insulated switchgear and a discharge that occurs outside the metal enclosure.
    Type: Application
    Filed: November 21, 2013
    Publication date: December 10, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Manabu YOSHIMURA, Tatsuya YABE, Takashi ITO