Patents by Inventor Ryoko KAWANO
Ryoko KAWANO 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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Publication number: 20220224086Abstract: A gas-insulated electrical apparatus according to the present invention comprises a grounded tank, a conductor placed inside the grounded tank, and an insulation gas filling the grounded tank. The insulation gas is a mixed gas comprising a first gas mainly responsible for insulation performance and having a global warming potential less than 6500, and a second gas having a small molecular weight, a low insulation performance, and a low global warming potential, as compared to the first gas. The insulation performance of the insulation gas is lower than the insulation performance of the first gas at a same pressure.Type: ApplicationFiled: July 12, 2019Publication date: July 14, 2022Applicant: Mitsubishi Electric CorporationInventors: Ryoko KAWANO, Manabu YOSHIMURA
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Patent number: 11031765Abstract: A gas-insulated electric apparatus includes: a sealed container made of metal; a high-voltage conductor, housed within the sealed container, that receives voltage; an insulating support member that insulates the high-voltage conductor from the sealed container and support the high-voltage conductor to the sealed container; and a nonlinear-resistance film covering at least a portion of an inner surface of the sealed container, the portion being on a lower side of the inner surface with respect to the high-voltage conductor. The nonlinear-resistance film is formed by particles of a nonlinear-resistance material and an insulating material, and the particles of the nonlinear-resistance material are dispersed in the insulating material. The particles of the nonlinear-resistance material are placed in the insulating material such that one or more of the particles of the nonlinear-resistance material is in constant contact with a conductive foreign object trapped inside the sealed container.Type: GrantFiled: January 30, 2017Date of Patent: June 8, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Manabu Yoshimura, Ryoko Kawano, Soichiro Kainaga, Nobuo Yokomura, Satoru Sato, Shinichiro Nakauchi
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Patent number: 11001729Abstract: 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: GrantFiled: April 6, 2017Date of Patent: May 11, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoru Sato, Naoki Yasuda, Nobuo Yokomura, Ryoko Kawano, Manabu Yoshimura, Shinichiro Nakauchi
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Patent number: 10965106Abstract: A gas-insulated electrical equipment includes: a grounded tank filled with an insulating gas; a central conductor which is disposed inside the grounded tank and to which to apply a voltage; a high-resistance insulating portion which is disposed on an inner surface of the grounded tank and which is configured of an insulating material of high resistivity; a low-resistance insulating portion which is disposed on at least a partial front surface of the high-resistance insulating portion and which has a resistivity lower than that of the high-resistance insulating portion, and a non-linear resistance insulating portion which is disposed on at least a partial front surface of the low-resistance insulating portion and which is configured of a non-linear resistance material, which exhibits a non-linear resistivity relative to a change in electric field, and an insulating material of high resistivity, wherein the low-resistance insulating portion has a floating potential.Type: GrantFiled: September 15, 2016Date of Patent: March 30, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryoko Kawano, Soichiro Kainaga, Manabu Yoshimura, Takao Tsurimoto
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Publication number: 20200091698Abstract: A gas-insulated electric apparatus includes: a sealed container made of metal; a high-voltage conductor, housed within the sealed container, that receives voltage; an insulating support member that insulates the high-voltage conductor from the sealed container and support the high-voltage conductor to the sealed container; and a nonlinear-resistance film covering at least a portion of an inner surface of the sealed container, the portion being on a lower side of the inner surface with respect to the high-voltage conductor. The nonlinear-resistance film is formed by particles of a nonlinear-resistance material and an insulating material, and the particles of the nonlinear-resistance material are dispersed in the insulating material. The particles of the nonlinear-resistance material are placed in the insulating material such that one or more of the particles of the nonlinear-resistance material is in constant contact with a conductive foreign object trapped inside the sealed container.Type: ApplicationFiled: January 30, 2017Publication date: March 19, 2020Applicant: Mitsubishi Electric CorporationInventors: Manabu Yoshimura, Ryoko Kawano, Soichiro Kainaga, Nobuo Yokomura, Satoru Sato, Shinichiro Nakauchi
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Publication number: 20190372318Abstract: A gas-insulated electrical equipment includes: a grounded tank filled with an insulating gas; a central conductor which is disposed inside the grounded tank and to which to apply a voltage; a high-resistance insulating portion which is disposed on an inner surface of the grounded tank and which is configured of an insulating material of high resistivity; a low-resistance insulating portion which is disposed on at least a partial front surface of the high-resistance insulating portion and which has a resistivity lower than that of the high-resistance insulating portion, and a non-linear resistance insulating portion which is disposed on at least a partial front surface of the low-resistance insulating portion and which is configured of a non-linear resistance material, which exhibits a non-linear resistivity relative to a change in electric field, and an insulating material of high resistivity, wherein the low-resistance insulating portion has a floating potential.Type: ApplicationFiled: September 15, 2016Publication date: December 5, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryoko KAWANO, Soichiro KAINAGA, Manabu YOSHIMURA, Takao TSURIMOTO
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Publication number: 20190144703Abstract: 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: ApplicationFiled: April 6, 2017Publication date: May 16, 2019Applicant: Mitsubishi Electric CorporationInventors: Satoru SATO, Naoki YASUDA, Nobuo YOKOMURA, Ryoko KAWANO, Manabu YOSHIMURA, Shinichiro NAKAUCHI
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Patent number: 10069285Abstract: 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: GrantFiled: July 16, 2015Date of Patent: September 4, 2018Assignee: Mitsubishi Electric CorporationInventors: Soichiro Kainaga, Ryoko Kawano, Manabu Yoshimura, Takao Tsurimoto, Shinichiro Nakauchi
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Publication number: 20170194775Abstract: 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: ApplicationFiled: July 16, 2015Publication date: July 6, 2017Applicant: Mitsubishi Electric CorporationInventors: Soichiro KAINAGA, Ryoko KAWANO, Manabu YOSHIMURA, Takao TSURIMOTO, Shinichiro NAKAUCHI