Patents by Inventor Toshiaki Rokunohe
Toshiaki Rokunohe 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: 11494888Abstract: Provided is an oil leakage detection apparatus by which oil leakage detection is performed even for colorless oil with high detection accuracy and without complicating the apparatus. The oil leakage detection apparatus of the invention includes a distance measurement unit configured to measure a distance to the oil-input machine, an ultraviolet light source configured to irradiate the oil-input machine with ultraviolet light, a color imaging unit configured to capture an image of the oil-input machine irradiated with ultraviolet light, an image processing unit configured to diagnose oil leakage of the oil-input machine based on the distance measured by the distance measurement unit and the captured image of the color imaging unit, and a display unit configured to display a processed image processed by the image processing unit.Type: GrantFiled: November 5, 2018Date of Patent: November 8, 2022Assignee: Hitachi, Ltd.Inventors: Li Lu, Akira Nishimizu, Toshiaki Rokunohe, Akira Yamagishi
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Patent number: 11249137Abstract: A diagnostic method of switchgear and a device of switchgear that allow regularly grasping a state with high accuracy with a simple configuration is provided. The diagnostic method of switchgear includes: obtaining signals from an acceleration sensor mounted to a switchgear and a load current flowing through the switchgear; determining a frequency to be focused from a spectrum analysis result of the signals from the acceleration sensor in an advance preparation phase of diagnosis of the switchgear, generating learning data using at least the frequency and the load current as feature values; and regularly diagnosing the state of the switchgear from the feature values obtained during diagnosis and the learning data during the diagnosis of the switchgear.Type: GrantFiled: May 12, 2020Date of Patent: February 15, 2022Assignee: Hitachi, Ltd.Inventors: Masaru Tatemi, Toshiaki Rokunohe, Masanori Otsuki, Akira Takahama
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Publication number: 20210192710Abstract: Provided is an oil leakage detection apparatus by which oil leakage detection is performed even for colorless oil with high detection accuracy and without complicating the apparatus. The oil leakage detection apparatus of the invention includes a distance measurement unit configured to measure a distance to the oil-input machine, an ultraviolet light source configured to irradiate the oil-input machine with ultraviolet light, a color imaging unit configured to capture an image of the oil-input machine irradiated with ultraviolet light, an image processing unit configured to diagnose oil leakage of the oil-input machine based on the distance measured by the distance measurement unit and the captured image of the color imaging unit, and a display unit configured to display a processed image processed by the image processing unit.Type: ApplicationFiled: November 5, 2018Publication date: June 24, 2021Inventors: Li LU, Akira NISHIMIZU, Toshiaki ROKUNOHE, Akira YAMAGISHI
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Publication number: 20200363473Abstract: A diagnostic method of switchgear and a device of switchgear that allow regularly grasping a state with high accuracy with a simple configuration is provided. The diagnostic method of switchgear includes: obtaining signals from an acceleration sensor mounted to a switchgear and a load current flowing through the switchgear; determining a frequency to be focused from a spectrum analysis result of the signals from the acceleration sensor in an advance preparation phase of diagnosis of the switchgear, generating learning data using at least the frequency and the load current as feature values; and regularly diagnosing the state of the switchgear from the feature values obtained during diagnosis and the learning data during the diagnosis of the switchgear.Type: ApplicationFiled: May 12, 2020Publication date: November 19, 2020Inventors: Masaru TATEMI, Toshiaki ROKUNOHE, Masanori OTSUKI, Akira TAKAHAMA
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Patent number: 10755442Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: January 12, 2018Date of Patent: August 25, 2020Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Patent number: 10615590Abstract: A symptom of malfunction regarding operating characteristics of a switch should be detected exactly. A switch operating characteristic monitoring device is comprised of a current sensor that measures a close command current of a switch, an auxiliary switch that outputs signals from at least two or more auxiliary contacts with reference to positions of a contactor, a measurement unit that measures signals from the current sensor and the auxiliary switch, a diagnosis unit that judges whether or not a malfunction occurs, and a display unit that displays a malfunction when a malfunction has been determined. A threshold is obtained in advance from multiple results of an opening/closing test performed beforehand. A calculation is made for characteristic times which are obtained from the close command current and signals from the auxiliary switch during actual operation of a circuit breaker. If a deviation is found by comparison with a threshold, a malfunction is determined.Type: GrantFiled: August 11, 2017Date of Patent: April 7, 2020Assignee: Hitachi, Ltd.Inventors: Masaru Tatemi, Toshiaki Rokunohe, Makoto Hirose, Hideaki Uchiyama
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Patent number: 10509021Abstract: There is provided a diagnosing device for an on-load tap changing apparatus of a transformer, which can diagnose the degradation degree of insulating oil at high accuracy by a relatively simple device configuration. A diagnosing device for an on-load tap changing apparatus has an insulating oil tank in which insulating oil is sealed, a changeover switching device that is disposed within the insulating oil tank and performs the tap changing operation of a tap winding, a tap selector that selects the tap position of the tap winding, and a polarity (transposition) changer that inverts the polarity of the tap winding or a winding connected to the tap winding. The diagnosing device includes an arc discharge light detector that detects arc discharge light that is emitted at changing the tap position of the tap selector. The degradation degree of the insulating oil is diagnosed based on the arc discharge light detected by the arc discharge light detector.Type: GrantFiled: September 13, 2018Date of Patent: December 17, 2019Assignee: Hitachi, Ltd.Inventors: Li Lu, Yoshio Hamadate, Toshiaki Rokunohe, Akira Yamagishi, Hideyuki Miyahara
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Publication number: 20190101521Abstract: There is provided a diagnosing device for an on-load tap changing apparatus of a transformer, which can diagnose the degradation degree of insulating oil at high accuracy by a relatively simple device configuration. A diagnosing device for an on-load tap changing apparatus has an insulating oil tank in which insulating oil is sealed, a changeover switching device that is disposed within the insulating oil tank and performs the tap changing operation of a tap winding, a tap selector that selects the tap position of the tap winding, and a polarity (transposition) changer that inverts the polarity of the tap winding or a winding connected to the tap winding. The diagnosing device includes an arc discharge light detector that detects arc discharge light that is emitted at changing the tap position of the tap selector. The degradation degree of the insulating oil is diagnosed based on the arc discharge light detected by the arc discharge light detector.Type: ApplicationFiled: September 13, 2018Publication date: April 4, 2019Inventors: Li LU, Yoshio HAMADATE, Toshiaki ROKUNOHE, Akira YAMAGISHI, Hideyuki MIYAHARA
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Patent number: 10190935Abstract: A gas leak detection device includes a learning section, which has a correlation between a gas temperature inside gas pressure containers and a surface temperature of the gas pressure containers in a learning period corresponding to a current value flowing in the conductor, to make database, and a diagnosis section, which extracts a gas temperature corresponding to the measured current value and the surface temperature from the learning section in a diagnosis period, corrects a gas pressure value corresponding to an arbitrary surface temperature to a gas pressure value of a reference temperature using the extracted gas temperature, and detects a leak of the insulating gas based on the corrected gas pressure value.Type: GrantFiled: July 22, 2016Date of Patent: January 29, 2019Assignee: Hitachi, Ltd.Inventors: Hisao Inami, Makoto Hirose, Hiroyuki Nakamichi, Masaru Tatemi, Toshiaki Rokunohe
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Patent number: 10113933Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: GrantFiled: March 27, 2015Date of Patent: October 30, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Toshiaki Rokunohe, Tomohiro Moriyama, Jun Nukaga, Akira Yamagishi, Yasutomo Saito
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Publication number: 20180137652Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: January 12, 2018Publication date: May 17, 2018Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20180062382Abstract: A symptom of malfunction regarding operating characteristics of a switch should be detected exactly. A switch operating characteristic monitoring device is comprised of a current sensor that measures a close command current of a switch, an auxiliary switch that outputs signals from at least two or more auxiliary contacts with reference to positions of a contactor, a measurement unit that measures signals from the current sensor and the auxiliary switch, a diagnosis unit that judges whether or not a malfunction occurs, and a display unit that displays a malfunction when a malfunction has been determined. A threshold is obtained in advance from multiple results of an opening/closing test performed beforehand. A calculation is made for characteristic times which are obtained from the close command current and signals from the auxiliary switch during actual operation of a circuit breaker. If a deviation is found by comparison with a threshold, a malfunction is determined.Type: ApplicationFiled: August 11, 2017Publication date: March 1, 2018Inventors: Masaru TATEMI, Toshiaki ROKUNOHE, Makoto HIROSE, Hideaki UCHIYAMA
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Patent number: 9898830Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: February 25, 2016Date of Patent: February 20, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Patent number: 9899172Abstract: The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.Type: GrantFiled: March 27, 2013Date of Patent: February 20, 2018Assignee: Hitachi, Ltd.Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Katsuhiko Shiraishi, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita
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Publication number: 20170234762Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: ApplicationFiled: March 27, 2015Publication date: August 17, 2017Applicant: HITACHI, LTD.Inventors: Li LU, Toshiaki ROKUNOHE, Tomohiro MORIYAMA, Jun NUKAGA, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20170030799Abstract: A gas leak detection device includes a learning section, which has a correlation between a gas temperature inside gas pressure containers and a surface temperature of the gas pressure containers in a learning period corresponding to a current value flowing in the conductor, to make database, and a diagnosis section, which extracts a gas temperature corresponding to the measured current value and the surface temperature from the learning section in a diagnosis period, corrects a gas pressure value corresponding to an arbitrary surface temperature to a gas pressure value of a reference temperature using the extracted gas temperature, and detects a leak of the insulating gas based on the corrected gas pressure value.Type: ApplicationFiled: July 22, 2016Publication date: February 2, 2017Inventors: Hisao INAMI, Makoto HIROSE, Hiroyuki NAKAMICHI, Masaru TATEMI, Toshiaki ROKUNOHE
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Patent number: 9520699Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.Type: GrantFiled: March 27, 2013Date of Patent: December 13, 2016Assignee: Hitachi, Ltd.Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita
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Publication number: 20160275699Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: February 25, 2016Publication date: September 22, 2016Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20160049268Abstract: Magnetic force of a permanent magnet can be converted into arc driving force efficiently, and the permanent magnet can be insulated from arc heat so as to suppress magnetic deterioration, whereby breaking performance can be secured over a long period of time.Type: ApplicationFiled: March 7, 2014Publication date: February 18, 2016Applicant: Hitachi, Ltd.Inventors: Toshiaki ROKUNOHE, Tatsuro KATO, Jun NUKAGA, Tomohiro MORIYAMA, Kenji TSUCHIYA
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Publication number: 20150131207Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.Type: ApplicationFiled: March 27, 2013Publication date: May 14, 2015Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita