Patents by Inventor Tomoaki Utsumi
Tomoaki Utsumi 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: 9437380Abstract: An object is to provide a switching unit or switching gear which enhances heat radiation performance and eliminates the need for an increase in unit size. In order to solve this problem the switching unit includes a switch and insulating resin located in a way to cover the periphery of the switch, in which the switch includes a fixed electrode, a movable electrode facing the fixed electrode and moving in an axial direction to contact or leave the fixed electrode, a bus side conductor connected to one of the electrodes and connected to a bus, and a load side conductor connected to the other electrode and connected to the load. The insulating resin has fins formed in a circumferential direction on the outer surface of the insulating resin and the distance between the periphery of the switch and the bottoms of the fins is almost constant in the circumferential direction.Type: GrantFiled: April 8, 2013Date of Patent: September 6, 2016Assignee: Hitachi, Ltd.Inventors: Miki Yamazaki, Tomoaki Utsumi, Masato Yabu, Ayumu Morita
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Publication number: 20150102013Abstract: An object is to provide a switching unit or switching gear which enhances heat radiation performance and eliminates the need for an increase in unit size. In order to solve this problem the switching unit includes a switch and insulating resin located in a way to cover the periphery of the switch, in which the switch includes a fixed electrode, a movable electrode facing the fixed electrode and moving in an axial direction to contact or leave the fixed electrode, a bus side conductor connected to one of the electrodes and connected to a bus, and a load side conductor connected to the other electrode and connected to the load. The insulating resin has fins formed in a circumferential direction on the outer surface of the insulating resin and the distance between the periphery of the switch and the bottoms of the fins is almost constant in the circumferential direction.Type: ApplicationFiled: April 8, 2013Publication date: April 16, 2015Inventors: Miki Yamazaki, Tomoaki Utsumi, Masato Yabu, Ayumu Morita
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Patent number: 8975550Abstract: A switch unit includes a plurality of switches, which are linearly disposed. The movable electrode in one switch and the fixed electrode in another switch are electrically connected to each other.Type: GrantFiled: January 5, 2012Date of Patent: March 10, 2015Assignee: Hitachi, Ltd.Inventors: Daisuke Sugai, Takashi Sato, Tomoaki Utsumi, Takashi Shirone, Kazuhiro Satou, Takafumi Hosono
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Patent number: 8872054Abstract: In order to improve cooling performance of a switch unit or switchgear equipped with the switch unit, the switch unit includes a switch having a movable electrode and a fixed electrode and is casted as one body with a resin, the resin is provided with resin fins, and the thickness of the resin fin is changed so that the resin fin has a thickness sloped in the longitudinal direction of the resin fin.Type: GrantFiled: November 17, 2011Date of Patent: October 28, 2014Assignee: Hitachi, Ltd.Inventors: Miki Yamazaki, Kenji Tsuchiya, Ayumu Morita, Tomoaki Utsumi
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Patent number: 8710388Abstract: A switchgear includes an earthing and disconnecting switch which linearly moves and is switchable to a disconnecting and an earthing positions, a vacuum valve which performs closing and breaking of a current in a vacuum container producing vacuum inside, and a solid insulator with which the earthing and disconnecting switch and the vacuum valve are covered, therein the earthing and disconnecting switch and the vacuum valve are electrically connected, and closing and breaking of a current is performed in the vacuum valve.Type: GrantFiled: August 11, 2010Date of Patent: April 29, 2014Assignee: Hitachi, Ltd.Inventors: Tomoaki Utsumi, Takashi Shirone, Takashi Sato, Kenji Tsuchiya, Ayumu Morita
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Patent number: 8247725Abstract: A vacuum switchgear has a vacuum valve including a movable conductor connected to an insulating rod, and a fixed conductor connected to a bus bar or to a load cable, a vacuum chamber encasing the vacuum valve, an insulating envelope covering the vacuum chamber, the outer surface thereof being covered with an electro-conductive layer thereby to earth the envelope, and an insulating lid gas-tightly fitted to the insulating envelope. The lid has an insulating bushing through which an insulating rod penetrates, the insulating rod being connected to an operating mechanism, wherein the insulating rod except a portion exposed from the bushing is gas-tightly confined in insulating gas atmosphere formed between the insulating envelope and the insulating lid.Type: GrantFiled: November 12, 2009Date of Patent: August 21, 2012Assignee: Hitachi, Ltd.Inventors: Ayumu Morita, Takashi Sato, Tomoaki Utsumi, Makoto Yano, Kenji Tsuchiya, Masato Kobayashi, Shuichi Kikukawa, Junichi Katagiri
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Publication number: 20120175234Abstract: A switch unit includes a plurality of switches, which are linearly disposed. The movable electrode in one switch and the fixed electrode in another switch are electrically connected to each other.Type: ApplicationFiled: January 5, 2012Publication date: July 12, 2012Applicant: Hitachi, Ltd.Inventors: Daisuke SUGAI, Takashi Sato, Tomoaki Utsumi, Takashi Shirone, Kazuhiro Satou, Takafumi Hosono
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Publication number: 20120132622Abstract: In order to improve cooling performance of a switch unit or switchgear equipped with the switch unit, the switch unit includes a switch having a movable electrode and a fixed electrode and is casted as one body with a resin, the resin is provided with resin fins, and the thickness of the resin fin is changed so that the resin fin has a thickness sloped in the longitudinal direction of the resin fin.Type: ApplicationFiled: November 17, 2011Publication date: May 31, 2012Inventors: Miki YAMAZAKI, Kenji TSUCHIYA, Ayumu MORITA, Tomoaki UTSUMI
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Patent number: 7902479Abstract: A reliable, compact vacuum switchgear is provided at an inexpensive cost. The vacuum switchgear comprises a switch 1 having a fixed electrode 12 and a movable electrode 13 connectable to and disconnectable from the fixed electrode 12, another switch 2 having a fixed electrode 22 and a movable electrode 23 connectable to and disconnectable from the fixed electrode 22, conductors 3 connected to the fixed electrodes 12, 22 of the switches 1, 2, earth switches 4 connected to the conductors 3, a mold section 7 formed by molding the conductors 3 and the earth switches 4 with resin, and a vacuum container 8 accommodating the switches 1, 2 and disposed on the mold section 7.Type: GrantFiled: June 13, 2007Date of Patent: March 8, 2011Assignee: Hitachi, Ltd.Inventors: Kenji Tsuchiya, Makoto Yano, Ayumu Morita, Takashi Sato, Masato Kobayashi, Tomoaki Utsumi
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Publication number: 20110036811Abstract: A switchgear includes an earthing and disconnecting switch which linearly moves and is switchable to a disconnecting and an earthing positions, a vacuum valve which performs closing and breaking of a current in a vacuum container producing vacuum inside, and a solid insulator with which the earthing and disconnecting switch and the vacuum valve are covered, therein the earthing and disconnecting switch and the vacuum valve are electrically connected, and closing and breaking of a current is performed in the vacuum valve.Type: ApplicationFiled: August 11, 2010Publication date: February 17, 2011Applicant: Hitachi, Ltd.Inventors: Tomoaki Utsumi, Takashi Shirone, Takashi Sato, Kenji Tsuchiya, Ayumu Morita
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Publication number: 20100122967Abstract: A vacuum switchgear comprising: a vacuum valve comprising a movable conductor connected to an insulating rod, and a fixed conductor connected to a bus bar or to a load cable, a vacuum chamber encasing the vacuum valve, an insulating envelope covering the vacuum chamber, the outer surface thereof being covered with an electro-conductive layer thereby to earth the envelope, an insulating lid gas-tightly fitted to the insulating envelope, the lid having an insulating bushing through which an insulating rod penetrates, the insulating rod being connected to an operating mechanism, wherein the insulating rod except a portion exposed from the bushing is gas-tightly confined in insulating gas atmosphere formed between the insulating envelope and the insulating lid.Type: ApplicationFiled: November 12, 2009Publication date: May 20, 2010Applicant: HITACHI, LTD.Inventors: Ayumu MORITA, Takashi SATO, Tomoaki UTSUMI, Makoto YANO, Kenji TSUCHIYA, Masato KOBAYASHI, Shuichi KIKUKAWA, Junichi KATAGIRI
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Publication number: 20070228014Abstract: A reliable, compact vacuum switchgear is provided at an inexpensive cost. The vacuum switchgear comprises a switch 1 having a fixed electrode 12 and a movable electrode 13 connectable to and disconnectable from the fixed electrode 12, another switch 2 having a fixed electrode 22 and a movable electrode 23 connectable to and disconnectable from the fixed electrode 22, conductors 3 connected to the fixed electrodes 12, 22 of the switches 1, 2, earth switches 4 connected to the conductors 3, a mold section 7 formed by molding the conductors 3 and the earth switches 4 with resin, and a vacuum container 8 accommodating the switches 1, 2 and disposed on the mold section 7.Type: ApplicationFiled: June 13, 2007Publication date: October 4, 2007Inventors: Kenji TSUCHIYA, Makoto Yano, Ayumu Morita, Takashi Sato, Masato Kobayashi, Tomoaki Utsumi
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Patent number: 7244903Abstract: A main circuit switching unit and an isolator are accommodated in a vacuum container. A first conductor and a main circuit conductor are arranged to extend in and out of the vacuum container. A movable electrode of the main circuit switching unit is connected to the first conductor through a first flexible conductor, and a movable electrode of the isolator is connected to the main circuit conductor through a second flexible conductor. A shield is arranged around the first conductor and the main circuit conductor. Another shield is arranged around a connecting portion between the first flexible conductor and the movable electrode of the main circuit switching unit. A still another shield is arranged around the isolator. A further another shield is arranged around the second flexible conductor. These shields are secured to the vacuum container through insulating spacers.Type: GrantFiled: March 15, 2005Date of Patent: July 17, 2007Assignee: Hitachi, Ltd.Inventors: Tomoaki Utsumi, Kazuhiro Satou, Takashi Shirone, Kenji Tsuchiya, Masato Kobayashi
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Patent number: 7193172Abstract: In a gas-insulated switchgear tank in which an electric insulating characteristic is improved by a gas, and which has a vacuum circuit-breaker, a disconnecting switch, and a container in which container the vacuum circuit-breaker and the disconnecting switch are arranged and an inside of which container is adapted to be hermetically sealed and filled with the gas in such a manner that the vacuum circuit-breaker and the disconnecting switch are at least partially surrounded by the gas, the gas includes N2 and O2.Type: GrantFiled: August 20, 2004Date of Patent: March 20, 2007Assignees: Hitachi, Ltd., Japan AE Power Systems CorporationInventors: Toshiaki Rokunohe, Yoshitaka Yagihashi, Fumihiro Endo, Tomoaki Utsumi, Shunji Ito, Takashi Omori
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Publication number: 20060186091Abstract: In a gas-insulated switchgear tank in which an electric insulating characteristic is improved by a gas, and which has a vacuum circuit-breaker, a disconnecting switch, and a container in which container the vacuum circuit-breaker and the disconnecting switch are arranged and an inside of which container is adapted to be hermetically sealed and filled with the gas in such a manner that the vacuum circuit-breaker and the disconnecting switch are at least partially surrounded by the gas, the gas includes N2 and O2.Type: ApplicationFiled: April 25, 2006Publication date: August 24, 2006Applicants: Hitachi Ltd., Japan AE Power Systems CorporationInventors: Toshiaki Rokunohe, Yoshitaka Yagihashi, Fumihiro Endo, Tomoaki Utsumi, Shunji Ito, Takashi Omori
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Patent number: 7064267Abstract: The present invention combines sensor portions 22, 23 of the device for measuring either current flowing through the line from the power inlet to the power outlet or voltage, or both, and bushings 150, 160 installed at either the power inlet or the power outlet, or both, so as to reduce the size of the gas insulating apparatus. Specifically, the above-mentioned sensor portions 22, 23 are installed in the space inside the porcelain tube 15 that constitutes the bushings 150, 160. As this space, it is preferable to use the space on the outer-periphery side of the electric field relaxation member 21 provided inside the porcelain tube 15.Type: GrantFiled: January 12, 2005Date of Patent: June 20, 2006Assignee: Hitachi, Ltd.Inventors: Tatsuro Kato, Tomoaki Utsumi, Fumihiro Endo, Kazuo Kobayashi, Kazuhiro Saito
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Patent number: 7027280Abstract: The present invention combines sensor portions 22, 23 of the device for measuring either current flowing through the line from the power inlet to the power outlet or voltage, or both, and bushings 150, 160 installed at either the power inlet or the power outlet, or both, so as to reduce the size of the gas insulating apparatus. Specifically, the above-mentioned sensor portions 22, 23 are installed in the space inside the porcelain tube 15 that constitutes the bushings 150, 160. As this space, it is preferable to use the space on the outer-periphery side of the electric field relaxation member 21 provided inside the porcelain tube 15.Type: GrantFiled: January 12, 2005Date of Patent: April 11, 2006Assignee: Hitachi, Ltd.Inventors: Tatsuro Kato, Tomoaki Utsumi, Fumihiro Endo, Kazuo Kobayashi, Kazuhiro Saito
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Publication number: 20050173143Abstract: A main circuit switching unit and an isolator are accommodated in a vacuum container. A first conductor and a main circuit conductor are arranged to extend in and out of the vacuum container. A movable electrode of the main circuit switching unit is connected to the first conductor through a first flexible conductor, and a movable electrode of the isolator is connected to the main circuit conductor through a second flexible conductor. A shield is arranged around the first conductor and the main circuit conductor. Another shield is arranged around a connecting portion between the first flexible conductor and the movable electrode of the main circuit switching unit. A still another shield is arranged around the isolator. A further another shield is arranged around the second flexible conductor. These shields are secured to the vacuum container through insulating spacers.Type: ApplicationFiled: March 15, 2005Publication date: August 11, 2005Inventors: Tomoaki Utsumi, Kazuhiro Satou, Takashi Shirone, Kenji Tsuchiya, Masato Kobayashi
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Publication number: 20050135028Abstract: The present invention combines sensor portions 22, 23 of the device for measuring either current flowing through the line from the power inlet to the power outlet or voltage, or both, and bushings 150, 160 installed at either the power inlet or the power outlet, or both, so as to reduce the size of the gas insulating apparatus. Specifically, the above-mentioned sensor portions 22, 23 are installed in the space inside the porcelain tube 15 that constitutes the bushings 150, 160. As this space, it is preferable to use the space on the outer-periphery side of the electric field relaxation member 21 provided inside the porcelain tube 15.Type: ApplicationFiled: January 12, 2005Publication date: June 23, 2005Inventors: Tatsuro Kato, Tomoaki Utsumi, Fumihiro Endo, Kazuo Kobayashi, Kazuhiro Saito
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Publication number: 20050135029Abstract: The present invention combines sensor portions 22, 23 of the device for measuring either current flowing through the line from the power inlet to the power outlet or voltage, or both, and bushings 150, 160 installed at either the power inlet or the power outlet, or both, so as to reduce the size of the gas insulating apparatus. Specifically, the above-mentioned sensor portions 22, 23 are installed in the space inside the porcelain tube 15 that constitutes the bushings 150, 160. As this space, it is preferable to use the space on the outer-periphery side of the electric field relaxation member 21 provided inside the porcelain tube 15.Type: ApplicationFiled: January 12, 2005Publication date: June 23, 2005Inventors: Tatsuro Kato, Tomoaki Utsumi, Fumihiro Endo, Kazuo Kobayashi, Kazuhiro Saito