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公开(公告)号：US20190101521A1
公开(公告)日：2019-04-04
申请号：US16130308
申请日：2018-09-13
Applicant: Hitachi, Ltd.
Inventor： Li LU , Yoshio HAMADATE , Toshiaki ROKUNOHE , Akira YAMAGISHI , Hideyuki MIYAHARA
Abstract: 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.
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公开(公告)号：US20180137652A1
公开(公告)日：2018-05-17
申请号：US15869508
申请日：2018-01-12
Applicant: Hitachi, Ltd.
Inventor： Li LU , Satoshi ICHIMURA , Tomohiro MORIYAMA , Jun NUKAGA , Toshiaki ROKUNOHE , Akira YAMAGISHI , Yasutomo SAITO
Abstract: 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.
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公开(公告)号：US20240280635A1
公开(公告)日：2024-08-22
申请号：US18570157
申请日：2022-03-22
Applicant: Hitachi, Ltd.
Inventor： Takashi ENDO , Takeshi IWATA , Toshiaki ROKUNOHE , Hikaru KOYAMA , Kota DOHI
IPC: G01R31/327 , H04R3/00
CPC classification number: G01R31/327 , H04R3/00
Abstract: The acoustic diagnosis device extracts a second feature amount of an acoustic signal in which a delay of an acoustic signal collected by the microphone is corrected, the delay being generated from a relative distance between the circuit breaker and the microphone, during diagnosis of the circuit breaker, calculates a similarity between the second feature amount of the acoustic signal during the diagnosis and the first feature amount in the plurality of event models for each time, estimates the time at which the similarity becomes highest, as an occurrence timing of each event, and diagnoses the circuit breaker from a plurality of estimated occurrence timings.
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公开(公告)号：US20210192710A1
公开(公告)日：2021-06-24
申请号：US16771103
申请日：2018-11-05
Applicant: Hitachi, Ltd.
Inventor： Li LU , Akira NISHIMIZU , Toshiaki ROKUNOHE , Akira YAMAGISHI
Abstract: 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. Further, an oil leakage detection method of the invention includes measuring a distance from an oil-input machine, irradiating the oil-input device with ultraviolet light, capturing an image of the oil-input machine irradiated with ultraviolet light, diagnosing oil leakage of the oil-input machine based on the measured distance and the captured image, and displaying a processed image after the diagnosis processing.
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公开(公告)号：US20180062382A1
公开(公告)日：2018-03-01
申请号：US15674682
申请日：2017-08-11
Applicant: Hitachi, Ltd.
Inventor： Masaru TATEMI , Toshiaki ROKUNOHE , Makoto HIROSE , Hideaki UCHIYAMA
CPC classification number: H02H7/0854 , G01R31/3274 , G01R31/343 , H01H9/0066 , H01H33/59 , H02H3/04 , H02H3/044 , H02H5/00
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US20170030799A1
公开(公告)日：2017-02-02
申请号：US15216736
申请日：2016-07-22
Applicant: Hitachi, Ltd.
Inventor： Hisao INAMI , Makoto HIROSE , Hiroyuki NAKAMICHI , Masaru TATEMI , Toshiaki ROKUNOHE
CPC classification number: G01M3/3263 , H02B13/065 , H02B13/0655
Abstract: 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.
Abstract translation: 气体泄漏检测装置包括学习部，其在与在导体中流动的电流值相对应的学习时段内具有气体压力容器内的气体温度与气体压力容器的表面温度之间的相关性，以形成数据库;以及 在诊断期间，从学习部提取与测定的电流值和表面温度对应的气体温度的诊断部，使用该温度校正与任意表面温度对应的气体压力值为基准温度的气体压力值 提取气体温度，并且基于校正后的气体压力值检测绝缘气体的泄漏。
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公开(公告)号：US20170234762A1
公开(公告)日：2017-08-17
申请号：US15519301
申请日：2015-03-27
Applicant: HITACHI, LTD.
Inventor： Li LU , Toshiaki ROKUNOHE , Tomohiro MORIYAMA , Jun NUKAGA , Akira YAMAGISHI , Yasutomo SAITO
CPC classification number: G01M3/38 , G01N21/6456 , G01N33/28 , G01N2021/6465 , H01F27/12
Abstract: 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.
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公开(公告)号：US20160275699A1
公开(公告)日：2016-09-22
申请号：US15053294
申请日：2016-02-25
Applicant: Hitachi, Ltd.
Inventor： Li LU , Satoshi ICHIMURA , Tomohiro MORIYAMA , Jun NUKAGA , Toshiaki ROKUNOHE , Akira YAMAGISHI , Yasutomo SAITO
CPC classification number: G06T7/90 , G01V8/00 , G06T7/0004 , G06T7/136 , G06T2207/10024 , H04N9/045
Abstract: 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.
Abstract translation: 本发明的漏油检测器包括图像处理单元，其中，图像处理单元计算在紫外线照射之后物体的彩色图像中的每个像素的饱和度和强度值，绘制强度饱和度 以X轴表示的饱和特性曲线和Y轴表示的强度，以每个饱和度的强度的上限和下限为基准，基于在 并且在强度 - 饱和度特性线中确定与强度超过上限阈值的像素组相对应的区域和强度低于下限阈值的像素组， 漏油附着区域。
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公开(公告)号：US20160049268A1
公开(公告)日：2016-02-18
申请号：US14783000
申请日：2014-03-07
Applicant: HITACHI, LTD.
Inventor： Toshiaki ROKUNOHE , Tatsuro KATO , Jun NUKAGA , Tomohiro MORIYAMA , Kenji TSUCHIYA
IPC: H01H33/18
CPC classification number: H01H33/182 , H01H1/385 , H01H9/443 , H01H33/64
Abstract: 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. In order to solve the above-described problems, the switchgear of the present invention includes: a fixed side contactor that is provided to a fixed side conductor; a moving contact that can be driven reciprocally with respect to the fixed side contactor, the moving contact being supported by a movable side conductor via a movable side contactor, the moving contact performing opening and closing operation by contacting to and separating from the fixed side contactor; and a permanent magnet generating a magnetic field on an arc to extinguish the arc through the opening operation, the arc being generated between the fixed side contactor and the moving contact, and the permanent magnet is provided on a tip portion of the fixed side conductor to be positioned closer to the movable side contactor side than the fixed side contactor, and the permanent magnet is covered with an insulating member.
Abstract translation: 永磁体的磁力可以有效地转换为电弧驱动力，并且永磁体可以与电弧热绝缘，以便抑制磁性劣化，从而可以长时间确保断裂性能。 为了解决上述问题，本发明的开关装置包括：固定侧接触器，其设置在固定侧导体上; 能够相对于固定侧接触器往复运动的移动接触件，可动接触件通过可动侧接触器由可动侧导体支撑，所述移动接触件通过接触和分离固定侧接触器进行开闭操作 ; 以及在电弧上产生磁场以通过打开操作熄灭电弧的永磁体，在固定侧接触器和可移动触点之间产生电弧，并且永磁体设置在固定侧导体的尖端部分上 比固定侧接触器更靠近可动侧接触器侧，并且永磁体被绝缘构件覆盖。
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公开(公告)号：US20150054524A1
公开(公告)日：2015-02-26
申请号：US14451141
申请日：2014-08-04
Applicant: Hitachi, Ltd.
Inventor： Chie KOBAYASHI , Toshiaki ROKUNOHE , Yoshiharu WADA , Go KOBAYASHI , Ken OBAYASHI
CPC classification number: G01R31/1227
Abstract: A partial discharge measurement device according to the present invention includes a frequency separation unit for separating a partial discharge signal which occurs in an apparatus under diagnosis and is detected by a sensor into the partial discharge signal and a main circuit voltage phase signal, an arithmetic device which receives the partial discharge signal and the main circuit voltage phase signal separated by the frequency separation unit and calculates a partial discharge signal synchronized with a main circuit voltage based on the partial discharge signal and the main circuit voltage phase signal, a power supply device for extracting a voltage obtained by dividing the main circuit voltage and supplying a power supply voltage to the arithmetic device, and a control unit for issuing an instruction for powering on or off at least the arithmetic device to the power supply device.
Abstract translation: 根据本发明的局部放电测量装置包括：频率分离单元，用于将在诊断中发生的并且由传感器检测到的局部放电信号分离成局部放电信号和主电路电压相位信号;运算器件 其接收由频率分离单元分离的局部放电信号和主电路电压相位信号，并且基于部分放电信号和主电路电压相位信号计算与主电路电压同步的局部放电信号;电源装置， 提取通过划分主电路电压而获得的电压并将电源电压提供给运算装置;以及控制单元，用于向至少一个运算装置发送接通或关闭供电装置的指令。
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