Patents by Inventor Shiro Maruyama
Shiro Maruyama 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).
-
Publication number: 20140139959Abstract: According to one embodiment, an excitation inrush current suppression device for suppressing excitation inrush currents flowing through a breaker of the three-phase collective operation type for opening and closing connection is configured to measure a three-phase AC voltage of the power supply bus bar to calculate prospective magnetic fluxes of the transformer, and to measure a three-phase AC voltage on the transformer side to calculate residual magnetic fluxes of the transformer after shutoff, so as to set the breaker closed when polarities of the prospective magnetic fluxes respectively agree with polarities of the residual magnetic fluxes in all of the phases respectively.Type: ApplicationFiled: January 24, 2014Publication date: May 22, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kei KAWASAKI, Tadashi KOSHIZUKA, Shiro MARUYAMA, Minoru SAITO, Noriyuki NAGAYAMA
-
Publication number: 20140016235Abstract: According to one embodiment, there is provided an inrush current suppression apparatus that suppresses an inrush current generated when shunt capacitors are connected to a power system. The apparatus includes a power supply voltage measurement unit measuring a power supply voltage, a circuit breaker current measurement unit measuring a circuit breaker current, a residual voltage polarity determination unit determining the polarities of three phases of a residual voltage, a specific phase determination unit determining a specific phase, a closing phase detector detecting a closing phase, and a circuit breaker closing unit closing the circuit breaker in the closing phase.Type: ApplicationFiled: September 17, 2013Publication date: January 16, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Tadashi KOSHIZUKA, Minoru SAITO, Shiro MARUYAMA, Hiroyuki MAEHARA, Yoshimasa SATO
-
Publication number: 20130300215Abstract: According to one embodiment, there is provided an inrush current suppression apparatus that suppresses an inrush current generated when shunt capacitors are connected to a power system, the apparatus including a voltage measurement unit measuring power source voltages, a current measurement unit measuring circuit breaker currents, a polarity determination unit determining the polarities of residual voltages, a phase section detector detecting a phase section in which the polarities of the residual voltages match the polarities of the power source voltages, and a circuit breaker closing unit closing the circuit breaker within the phase section.Type: ApplicationFiled: September 20, 2011Publication date: November 14, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tadashi Koshizuka, Shiro Maruyama, Hiroyuki Maehara, Yoshimasa Sato
-
Patent number: 8564159Abstract: Inrush current suppression apparatus for suppressing a transformer inrush current including a transformer side voltage measurement unit which measures a voltage at a side of a transformer, a residual magnetic flux calculation unit which calculates three line-to-line residual magnetic fluxes, a power supply side voltage measurement unit which measures a voltage at a side of a power supply, a stable-state magnetic flux calculation unit which calculates three line-to-line stable-state magnetic fluxes, based on the voltage at the side of the power supply, a phase determination unit which determines a phase in which phases of the three line-to-line stable-state magnetic fluxes are respectively the same in polarity as phases of the three line-to-line residual magnetic fluxes, and a closing unit which closes the circuit breaker in the phase determined by the phase determination unit.Type: GrantFiled: January 27, 2011Date of Patent: October 22, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Keisuke Udagawa, Tadashi Koshizuka, Shiro Maruyama, Minoru Saito, Noriyuki Nagayama
-
Patent number: 8199445Abstract: A gas insulated circuit breaker system has: a container that encapsulates insulating gas; a main contact in the container that opens/closes the main circuit; a resistor contact in the container, connected in parallel to the main contact, to be opened after elapse of a predetermined time after the main contact is opened and to be closed at a predetermined time before the main contact is closed; a resistor in the container, serially connected to the resistor contact and connected in parallel to the main contact together with the resistor contact; a temperature sensor that measures temperature of surrounding of the resistor; and a temperature estimation section that estimates a temperature of the resistor based on a timing of opening/closing operation of the main contact, a current flowing through the main circuit and the measured temperature.Type: GrantFiled: October 16, 2009Date of Patent: June 12, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Shiro Maruyama, Takashi Nakajima, Hiroyuki Hayata, Kazuhide Bannai, Kozo Matsushita, Hideo Ishizuka
-
Patent number: 8018097Abstract: A switching control system of circuit breaker, including at least: one switching control unit per circuit breaker, each of which inputs electrical quantity of power system voltage and main circuit current, state quantity of a circuit breaker, and an opening command signal or closing command signal of the circuit breaker, and performs control to cause the circuit breaker to open or close at a desired phase of the power system voltage or main circuit current; and a display operation unit connected with the switching control unit via a communication network and performs display operation to operate and monitor the operation and state of the switching control unit of circuit breaker. The switching control unit includes a first area for causing the circuit breaker to open or close at a desired phase of the power system voltage or current; and a second area for transmitting/receiving information via the communication network.Type: GrantFiled: October 2, 2007Date of Patent: September 13, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Minoru Saito, Hiroyuki Maehara, Shiro Maruyama
-
Publication number: 20110181989Abstract: Inrush current suppression apparatus for suppressing a transformer inrush current including a transformer side voltage measurement unit which measures a voltage at a side of a transformer, a residual magnetic flux calculation unit which calculates three line-to-line residual magnetic fluxes, a power supply side voltage measurement unit which measures a voltage at a side of a power supply, a stable-state magnetic flux calculation unit which calculates three line-to-line stable-state magnetic fluxes, based on the voltage at the side of the power supply, a phase determination unit which determines a phase in which phases of the three line-to-line stable-state magnetic fluxes are respectively the same in polarity as phases of the three line-to-line residual magnetic fluxes, and a closing unit which closes the circuit breaker in the phase determined by the phase determination unit.Type: ApplicationFiled: January 27, 2011Publication date: July 28, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Keisuke UDAGAWA, Tadashi KOSHIZUKA, Shiro MARUYAMA, Minoru SAITO, Noriyuki NAGAYAMA
-
Publication number: 20110080161Abstract: A partial discharge detector for gas-insulated electric apparatus of an embodiment detects an electromagnetic wave ascribable to partial discharge in a gas-insulated electric apparatus which is filled with insulating gas, and in which a conductor to which high voltage is applied is supported in conductor supporting holes provided at centers of a plurality of disk-shaped insulating plates, and a plurality of flanged-conductive pipes form a hermetically sealed container, with flange portions thereof pressingly sandwiching and holding peripheral edge portions of the insulating plates from both surface sides. The partial discharge detector for gas-insulated electric apparatus of this embodiment is characterized in that an antenna detecting the electromagnetic wave is disposed in close contact on a portion, of each of the insulating plates, exposed from the flange portions of the flanged conductive pipes, via an elastic member capable of transmitting the electromagnetic wave.Type: ApplicationFiled: October 1, 2010Publication date: April 7, 2011Inventors: Shiro Maruyama, Toshihiro Hoshino, Takaaki Sakakibara
-
Patent number: 7868755Abstract: To shorten a period of time necessary for performing routine inspections and reduce costs by monitoring a state such as a contact failure of a switching equipment which constitutes a power reception circuit or a branch circuit of a substation through a simple construction. A sensor attached IC tag application high voltage equipment is constructed by detachably mounting a sensor attached IC tag at a position where a sensor of a sensor attached IC tag obtains a physical quantity of a detection target, wherein the sensor attached IC tag is configured to communicate with an externally located IC tag reader.Type: GrantFiled: October 5, 2007Date of Patent: January 11, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Hanai, Haruhisa Wada, Hirokazu Takagi, Shiro Maruyama, Masayuki Sato
-
Publication number: 20110000772Abstract: A power switchgear having an action monitoring function by an IC tag with a sensor includes: a main body including a switching section carrying out switching action; an operating mechanism including a switching operation section mechanically connected to the switching section so as to carry out switching operation of the switching section; and an action monitoring section monitoring an action of the switching operation section and wirelessly communicating with an external equipment. The action monitoring section includes an IC tag with sensor attached to a portion of the switching operation section and a case surrounding at least a portion of the switching operation section including the IC tag with a sensor.Type: ApplicationFiled: October 15, 2007Publication date: January 6, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masahiro Hanai, Haruhisa Wada, Shiro Maruyama
-
Patent number: 7746082Abstract: The present invention provides a high-performance partial discharge detection device which is user-friendly and compact and which allows detection of the electromagnetic waves caused by partial discharge, over a wide bandwidth with a simple constitution and a favorable S/N ratio. The waveguide antenna which receives electromagnetic waves that leak from the insulating spacer is attached to the outer circumferential face of the insulating spacer. The waveguide antenna is constituted by a waveguide portion and a coaxial cable connector which is installed on the waveguide portion. The waveguide portion has a metal short-circuit plate provided at one end thereof, and an opening formed at the other end thereof, which covers part of the outer circumferential face of the insulating spacer.Type: GrantFiled: December 3, 2007Date of Patent: June 29, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Shiro Maruyama, Takaaki Sakakibara, Toshihiro Hoshino
-
Publication number: 20100141050Abstract: A switching control system of circuit breaker is provided, which can easily connect with such an external equipment as a PC, both at the work site and remote side, without using dedicated software, and can implement efficient maintenance and data collection. The system comprises: one or more switching control units of circuit breaker 100 each of which inputs electrical quantity of power system voltage and main circuit current, state quantity of a circuit breaker, and an opening command signal or closing command signal of the circuit breaker, and performs control to cause the circuit breaker to open or close at a desired phase of the power system voltage or main circuit current; and a display operation unit 700, which is connected with the switching control unit of circuit breaker via a communication network 500 and performs display operation to operate and monitor the operation and state of the switching control unit of circuit breaker.Type: ApplicationFiled: October 2, 2007Publication date: June 10, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Minoru Saito, Hiroyuke Maehara, Shiro Maruyama
-
Publication number: 20100102036Abstract: A gas insulated circuit breaker system has: a container that encapsulates insulating gas; a main contact in the container that opens/closes the main circuit; a resistor contact in the container, connected in parallel to the main contact, to be opened after elapse of a predetermined time after the main contact is opened and to be closed at a predetermined time before the main contact is closed; a resistor in the container, serially connected to the resistor contact and connected in parallel to the main contact together with the resistor contact; a temperature sensor that measures temperature of surrounding of the resistor; and a temperature estimation section that estimates a temperature of the resistor based on a timing of opening/closing operation of the main contact, a current flowing through the main circuit and the measured temperature.Type: ApplicationFiled: October 16, 2009Publication date: April 29, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shiro MARUYAMA, Takashi Nakajima, Hiroyuki Hayata, Kazuhide Bannai, Kozo Matsushita, Hideo Ishizuka
-
Publication number: 20090027062Abstract: The present invention provides a high-performance partial discharge detection device which is user-friendly and compact and which allows detection of the electromagnetic waves caused by partial discharge, over a wide bandwidth with a simple constitution and a favorable S/N ratio. The waveguide antenna which receives electromagnetic waves that leak from the insulating spacer is attached to the outer circumferential face of the insulating spacer. The waveguide antenna is constituted by a waveguide portion and a coaxial cable connector which is installed on the waveguide portion. The waveguide portion has a metal short-circuit plate provided at one end thereof, and an opening formed at the other end thereof, which covers part of the outer circumferential face of the insulating spacer.Type: ApplicationFiled: December 3, 2007Publication date: January 29, 2009Inventors: Shiro MARUYAMA, Takaaki Sakakibara, Toshihiro Hoshino
-
Publication number: 20080087115Abstract: To shorten a period of time necessary for performing routine inspections and reduce costs by monitoring a state such as a contact failure of a switching equipment which constitutes a power reception circuit or a branch circuit of a substation through a simple construction. A sensor attached IC tag application high voltage equipment is constructed by detachably mounting a sensor attached IC tag at a position where a sensor of a sensor attached IC tag obtains a physical quantity of a detection target, wherein the sensor attached IC tag is configured to communicate with an externally located IC tag reader.Type: ApplicationFiled: October 5, 2007Publication date: April 17, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masahiro Hanai, Haruhisa Wada, Hirokazu Takagi, Shiro Maruyama, Masayuki Sato
-
Patent number: 6845301Abstract: The present invention relates to a system for protecting and controlling main-circuit components of an electricity transmission substation. The system includes devices for digital data output, protection-and-controlling, component controlling-and-monitoring, and communication. The digital data output devices input analogue AC electric values and output digital data. The protection-and-controlling devices input the data from the digital data output devices, and further control, monitor, and protect the substation main-circuit components. The component controlling-and-monitoring devices receive commands from the protection-and-controlling devices or from the substation controlling-and-monitoring equipment, and further control and monitor the substation main-circuit components. The devices for digital data output, the protection-and-controlling, and component controlling-and-monitoring are disposed near or within their corresponding substation main-circuit components.Type: GrantFiled: January 30, 2002Date of Patent: January 18, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Koichi Hamamatsu, Tokuo Ito, Hachidai Ito, Yoshito Sameda, Toshiyuki Saida, Noriyoshi Suga, Hiromi Nagasaki, Yuuji Minami, Takashi Nakajima, Shiro Maruyama, Minoru Saito, Tatsuji Tanaka, Masao Takahashi, Setsuo Tamura, Masayuki Kosakada
-
Patent number: 6522247Abstract: A data acquisition and transmitting unit samples the signal indicating the apparatus state quantity from a sensor provided on an apparatus, converts the signal into absolute-time-tagged monitoring data S(t), stores the data S(t), and transmits the data S(t) to a network. A digital protection and control unit takes in the quantity data E about the system of the apparatus and the operating state data P about the apparatus, converts these data into absolute-time-tagged data E(t) and operating state data P(t), stores these converted data, and transmits these data E(t) and P(t) to the network. A data display unit receives the data S(t), E(t), and P(t) from the data acquisition and transmitting unit and digital protective and control unit via the network and displays the state of the apparatus on the basis of the data S(t), E(t), and P(t).Type: GrantFiled: May 22, 2001Date of Patent: February 18, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Shiro Maruyama, Takaaki Sakakibara, Kyoichi Uehara, Masayuki Akazaki
-
Publication number: 20020116092Abstract: A system for protecting and controlling substation main-circuit components. The system comprises: digital data output means for inputting analogue AC electric values and outputting digital data; protection-and-controlling means for inputting the data from the digital data output means, and for controlling, monitoring and protecting the substation main-circuit components; component controlling-and-monitoring means for receiving commands from the protection-and-controlling means or the substation controlling-and-monitoring equipment, and for controlling and monitoring the substation main-circuit components; and communication means. The digital data output means, the protection-and-controlling means and the component controlling-and-monitoring means are built in their corresponding substation main-circuit components.Type: ApplicationFiled: January 30, 2002Publication date: August 22, 2002Inventors: Koichi Hamamatsu, Tokuo Ito, Hachidai Ito, Yoshito Sameda, Toshiyuki Saida, Noriyoshi Suga, Hiromi Nagasaki, Yuuji Minami, Takashi Nakajima, Shiro Maruyama, Minoru Saito, Tatsuji Tanaka, Masao Takahashi, Setsuo Tamura, Masayuki Kosakada
-
Publication number: 20010048375Abstract: A data acquisition and transmitting unit samples the signal indicating the apparatus state quantity from a sensor provided on an apparatus, converts the signal into absolute-time-tagged monitoring data S(t), stores the data S(t), and transmits the data S(t) to a network. A digital protection and control unit takes in the quantity data E about the system of the apparatus and the operating state data P about the apparatus, converts these data into absolute-time-tagged data E(t) and operating state data P(t), stores these converted data, and transmits these data E(t) and P(t) to the network. A data display unit receives the data S(t), E(t), and P(t) from the data acquisition and transmitting unit and digital protective and control unit via the network and displays the state of the apparatus on the basis of the data S(t), E(t), and P(t).Type: ApplicationFiled: May 22, 2001Publication date: December 6, 2001Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shiro Maruyama, Takaaki Sakakibara, Kyoichi Uehara, Masayuki Akazaki