Patents by Inventor Katsuhiko Sekiguchi
Katsuhiko Sekiguchi 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: 9548606Abstract: According to one embodiment, the A/D conversion unit includes a ?? modulating device which samples the analog electric quantity provided by the electric power system with a predetermined modulation frequency and outputs a bit stream changing over time of single bit obtained by performing ?? modulation, and the digital operation processing unit includes one or more digital filters which inputs the bit stream from the ?? modulating device and of which frequency characteristics differ according to a type of protection control operation, and one or more operation processing elements which perform different kinds of protection control operation processing, based on the bit stream provided by the digital filter.Type: GrantFiled: September 11, 2012Date of Patent: January 17, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, NATIONAL UNIVERSITY CORPORATION NAGOYA INSTITUTE OF TECHNOLOGYInventors: Daiju Itagaki, Shogo Miura, Katsuhiko Sekiguchi, Satoshi Hirano
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Patent number: 8767800Abstract: A protection relay device includes: an analog-to-digital converter that samples an analog signal inputted from an analog input unit and converts the analog signal into digital data; a variable filter that filters and outputs the digital data, the variable filter having a filter coefficient that is varied by external control; and an adaptive controller that variably controls the filter coefficient of the variable filter so that a difference between the digital data filtered by the variable filter and a target signal decreases.Type: GrantFiled: September 12, 2012Date of Patent: July 1, 2014Assignees: Kabushiki Kaisha Toshiba, Tohoku UniversityInventors: Takaaki Ohnari, Tomoyuki Kawasaki, Katsuhiko Sekiguchi, Shogo Miura, Masayuki Kawamata
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Patent number: 8547201Abstract: According to one embodiment, when sending a transmission target main data 21, an authentication-tag generator unit 13 generates an authentication tag 23 by using a main data 21 and a key data 22 stored in a key-data storage unit 12. A transmitter/receiver unit 14 adds the authentication tag 23 to the main data 32 sends as a transmission data. When receiving the received data 24a, the transmitter/receiver unit 14 divides the received data into a main data 21a and an authentication tag 23a. The authentication-tag generator unit 13 generates an authentication tag 23b for comparison. A received-data authentication unit 15 determines whether or not those the received authentication tag 23a and the authentication tag for comparison 23b match with each other. A different key data is used every time upon the authentication-tag generation and use time of each key data during a set period is restricted.Type: GrantFiled: December 28, 2009Date of Patent: October 1, 2013Assignees: Kabushiki Kaisha Toshiba, Yokohama National UniversityInventors: Shigeki Katayama, Katsuhiko Sekiguchi, Kazuto Fukushima, Tsutomu Matsumoto
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Publication number: 20130063205Abstract: A protection relay device includes: an analog-to-digital converter that samples an analog signal inputted from an analog input unit and converts the analog signal into digital data; a variable filter that filters and outputs the digital data, the variable filter having a filter coefficient that is varied by external control; and an adaptive controller that variably controls the filter coefficient of the variable filter so that a difference between the digital data filtered by the variable filter and a target signal decreases.Type: ApplicationFiled: September 12, 2012Publication date: March 14, 2013Applicants: TOHOKU UNIVERSITY, KABUSHIKI KAISHA TOSHIBAInventors: Takaaki Ohnari, Tomoyuki Kawasaki, Katsuhiko Sekiguchi, Shogo Miura, Masayuki Kawamata
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Publication number: 20130006433Abstract: According to one embodiment, the A/D conversion unit includes a ?? modulating device which samples the analog electric quantity provided by the electric power system with a predetermined modulation frequency and outputs a bit stream changing over time of single bit obtained by performing ?? modulation, and the digital operation processing unit includes one or more digital filters which inputs the bit stream from the ?? modulating device and of which frequency characteristics differ according to a type of protection control operation, and one or more operation processing elements which perform different kinds of protection control operation processing, based on the bit stream provided by the digital filter.Type: ApplicationFiled: September 11, 2012Publication date: January 3, 2013Applicants: NATIONAL UNIVERSITY CORPORATION NAGOYA INSTITUTE OF TECHNOLOGY, KABUSHIKI KAISHA TOSHIBAInventors: Daiju ITAGAKI, Shogo Miura, Katsuhiko Sekiguchi, Satoshi Hirano
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Publication number: 20120019355Abstract: According to one embodiment, when sending a transmission target main data 21, an authentication-tag generator unit 13 generates an authentication tag 23 by using a main data 21 and a key data 22 stored in a key-data storage unit 12. A transmitter/receiver unit 14 adds the authentication tag 23 to the main data 32 sends as a transmission data. When receiving the received data 24a, the transmitter/receiver unit 14 divides the received data into a main data 21a and an authentication tag 23a. The authentication-tag generator unit 13 generates an authentication tag 23b for comparison. A received-data authentication unit 15 determines whether or not those the received authentication tag 23a and the authentication tag for comparison 23b match with each other. A different key data is used every time upon the authentication-tag generation and use time of each key data during a set period is restricted.Type: ApplicationFiled: December 28, 2009Publication date: January 26, 2012Applicants: YOKOHAMA NATIONAL UNIVERSITY, KABUSHIKI KAISHA TOSHIBAInventors: Shigeki Katayama, Katsuhiko Sekiguchi, Kazuto Fukushima, Tsutomu Matsumoto
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Patent number: 7930124Abstract: This invention provides a protection control measurement system, with excellent economy and maintainability. In the protection control measurement terminal 1, electric quantity acquisition and transmitter 14-1 determines synchro-phasor quantities from electric quantity data and transmits the synchro-phasor quantities to arrival time-guaranteed transmitter 15-1. The arrival time-guaranteed transmitter 15-1 transmits in real- time the synchro-phasor quantities to the parent station device 3. Setting value transmitter 14-2 transmits setting value data to the message transmitter 15-2, which performs message transmission to the parent station device 3 over the communication network 2. In the parent station device 3, electric quantity arithmetic processor 32-1 calculates electric quantities as close as possible to true values by multiplying received synchro-phasor quantities by setting value data.Type: GrantFiled: September 11, 2008Date of Patent: April 19, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Hironori Sakashita, Katsuhiko Sekiguchi, Yoshinori Takei
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Patent number: 7737677Abstract: The present invention provides a wide area protection control measurement system and method which excels in economy, reliability and expandability, in which applied arithmetic operation functions for protection, control and measurement can be freely added and changed, without adding or changing power monitoring terminals to be installed in the electric-supply station. The wide area protection control measurement system is configured from N number of power monitoring terminals 1 installed in an electric-supply station in a target range, one electric quantity aggregation device 3 connected with these power monitoring terminals 1 via a communication network 2, and M number of applied arithmetic operation devices 4 connected with the electric aggregation device 3 through an inter-device connection. Each power monitoring terminal 1 transmits electric quantity data to the electric quantity aggregation device 3 via the communication network 2.Type: GrantFiled: September 3, 2008Date of Patent: June 15, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Katsuhiko Sekiguchi, Hideyuki Takani, Hideaki Sugiura
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Publication number: 20100007333Abstract: The present invention provides a wide area protection control measurement system and method which excels in economy, reliability and expandability, in which applied arithmetic operation functions for protection, control and measurement can be freely added and changed, without adding or changing power monitoring terminals to be installed in the electric-supply station. The wide area protection control measurement system is configured from N number of power monitoring terminals 1 installed in an electric-supply station in a target range, one electric quantity aggregation device 3 connected with these power monitoring terminals 1 via a communication network 2, and M number of applied arithmetic operation devices 4 connected with the electric aggregation device 3 through an inter-device connection. Each power monitoring terminal 1 transmits electric quantity data to the electric quantity aggregation device 3 via the communication network 2.Type: ApplicationFiled: September 3, 2008Publication date: January 14, 2010Inventors: Katsuhiko Sekiguchi, Hideyuki Takani, Hideaki Sugiura
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Publication number: 20090076745Abstract: This invention provides a protection control measurement system, with excellent economy and maintainability, which collects protection control measurement data via a communication network from a plurality of terminals which acquire electric quantities. In the protection control measurement terminal 1, electric quantity acquisition and transmission means 14-1 determines synchro-phasor quantities from electric quantity data and transmits the synchro-phasor quantities to arrival time-guaranteed transmission means 15-1. The arrival time-guaranteed transmission means 15-1 transmits in real-time the synchro-phasor quantities to the parent station device 3. Setting value transmission means 14-2 transmits setting value data to the message transmission means 15-2, which performs message transmission to the parent station device 3 over the communication network 2.Type: ApplicationFiled: September 11, 2008Publication date: March 19, 2009Inventors: Hironori Sakashita, Katsuhiko Sekiguchi, Yoshinori Takei
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Publication number: 20070088777Abstract: In an agent system having a plurality of agents each of which executes predetermined processing while moving through a plurality of nodes connected to an information network, the plurality of nodes respectively have a plurality of agent platforms which receive and execute the agents, one of the agent platform and the node has synchronization means, and when the plurality of agents which are running on the same node should synchronously execute operation, the plurality of agents on the same node execute processing synchronously by sending a synchronization request message to the synchronization means.Type: ApplicationFiled: November 14, 2006Publication date: April 19, 2007Inventors: Takeshi MAEDA, Shigeki Katayama, Takahiro Hatanaka, Setsuo Tamura, Manabu Shimoo, Yoshihiro Koizumi, Tatsuji Tanaka, Takaya Shono, Katsuhiko Sekiguchi, Koichi Sawai
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Patent number: 6741916Abstract: An accident point locating system locates an accident point on a power transmission line. A digital protective control system has a plurality of digital protective controllers that receive state data representing a state of an electric power system and convert the same into corresponding digital state data. An absolute time acquiring means acquires an absolute time when the state data is sampled. A state data processing decides whether any malfunction occurred in the power transmission system on the basis of the digital state and executes a protective operation when it is decided that an accident occurred in the power transmission system. A recording device adds an absolute sampling time to the digital state data and records the digital state data with the absolute time. A digital data sending device provides the digital state data with the absolute time on a communication network.Type: GrantFiled: November 13, 2000Date of Patent: May 25, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Katsuhiko Sekiguchi, Yoshihiro Shirota
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Patent number: 6618648Abstract: The control system for a plant comprises a rectifier connected to a network. The rectifier has a unit for acquiring precise time, a unit for sampling the state quantity on the precise time to convert the state quantity into digital data and a unit for adding the precise time at each sampling timing to the digital data to transmit the digital data each having the precise time to the network. A breaker is connected to the network. The breaker has a unit for receiving, through the network, a control command thereto and a unit for transmitting an operating state thereof to the network. A control apparatus is connected to the network. The control apparatus has a unit for performing an operation process on the digital data transmitted through the communication network and the operating state of the breaker transmitted therethrough and a unit for transmitting the control command through the communication network to the breaker in response to a result of the control operation process of the performing unit.Type: GrantFiled: March 4, 1999Date of Patent: September 9, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Yoshihiro Shirota, Katsuhiko Sekiguchi, Tetsuya Miyoshi, Yutaka Fuwa, Yoshiyuki Shimokawa, Hideki Sasaki, Masao Hori
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Patent number: 6598224Abstract: In a data management unit in a computer system, the computer system has a computer in which the data management unit is incorporated, and a terminal intercommunicates with the computer. In the data management unit, an object data storage unit (memory) stores in addresses thereon data items to which the terminal is adapted to make access. A parameter management file stores thereon parameters concerning a data structure of each data item. The parameters include a data name of each data item, a data type of each data item, an address related to each data item on the data storage unit and an array information of at least one data item. Then at least one data item has an array structure, and the array information includes a number of the array elements. On a number of bytes definition table, a number of bytes corresponding to each data type of each data item is stored.Type: GrantFiled: April 28, 2000Date of Patent: July 22, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Maeda, Yutaka Sakai, Yoshihiro Koizumi, Tatsuji Tanaka, Katsuhiko Sekiguchi
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Publication number: 20030135541Abstract: In an agent system having a plurality of agents each of which executes predetermined processing while moving through a plurality of nodes connected to an information network, the plurality of nodes respectively have a plurality of agent platforms which receive and execute the agents, one of the agent platform and the node has synchronization means, and when the plurality of agents which are running on the same node should synchronously execute operation, the plurality of agents on the same node execute processing synchronously by sending a synchronization request message to the synchronization means.Type: ApplicationFiled: January 31, 2003Publication date: July 17, 2003Inventors: Takeshi Maeda, Shigeki Katayama, Takahiro Hatanaka, Setsuo Tamura, Manabu Shimoo, Yoshihiro Koizumi, Tatsuji Tanaka, Takaya Shono, Katsuhiko Sekiguchi, Koichi Sawai
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Patent number: 6571153Abstract: In the electric power system protective control system, a plurality of protective control apparatuses each having a protective control function to an electric power system are distributed and connected through a communication network to each other so that data communication is permitted among the respective protective control apparatuses. Each of the protective control apparatuses is carried out a process of executing a control operation related to the protective control function of the own apparatus according to a program module. The program module migrates through the communication network to the own apparatus along a predetermined route of migration. Each of the protective control apparatuses executes a process of migrating the program module from the own apparatus to another protective control apparatus. The another protective control apparatus is determined to a next destination of migration according to the route of migration.Type: GrantFiled: October 22, 1999Date of Patent: May 27, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Maeda, Yoshihiro Koizumi, Tatsuji Tanaka, Katsuhiko Sekiguchi
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Patent number: 6285917Abstract: An electric power system protection and control system, including, a plurality of protection controllers, each for executing protection and control of an electric power system by inputting a status quantity of the electric power system and for converting the status quantity into digital data, and a display controller connected to each of the protection controllers via a communication network, for displaying and controlling an operation and status of each of the protection controllers for monitoring. The display controller is provided with a program module sending unit for sending out a program module corresponding to contents for display control in the display controller to one of the protection controllers via the communication network, respectively.Type: GrantFiled: December 3, 1997Date of Patent: September 4, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Katsuhiko Sekiguchi, Michio Masui
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Patent number: 5926089Abstract: An electric power system protection and control system including a plurality of protection controllers, each for executing protection and control of an electric power system by inputting a status quantity of the electric power system and for converting the status quantity into digital data, and a display controller connected to each of the protection controllers via a communication network, for displaying and controlling an operation and status of each of the protection controllers for monitoring. Each of the protection controllers includes a core area not directly connected to the communication network for executing the protection and control of the electric power system, and a web area for sending and receiving a program module to and from the display controller and another one of the protection controllers or sending an information in the core area to the program module via the communication network, respectively.Type: GrantFiled: December 2, 1997Date of Patent: July 20, 1999Assignee: Kabushikik Kaisha ToshibaInventors: Katsuhiko Sekiguchi, Michio Masui