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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：US20170016796A1
公开(公告)日：2017-01-19
申请号：US15205504
申请日：2016-07-08
Applicant: Hitachi, Ltd.
Inventor： Li LU , Satoshi ICHIMURA , Tomohiro MORIYAMA , Jun NUKAGA , Akira YAMAGISHI , Yasutomo SAITO
CPC classification number: G01M3/20 , G01M3/38 , G06T7/0004 , H04N5/2256 , H04N5/2351 , H04N5/2353 , H04N9/045
Abstract: There is provided a leakage oil detection system including: a measurement device that includes a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process. The imaging device controls exposure according to an exposure control value provided in the imaging device, and the analysis device calls the imaged image which is recorded in the recording unit for the image processing unit, calculates brightness values of respective pixels in the imaged image, determines a maximum brightness value which has the largest value among the brightness values of the respective pixels, compares the maximum brightness value with a reference brightness value which is determined in advance, acquires the exposure control value of the imaging device, in which the nearest brightness value that is smaller than the reference brightness value is acquired, images the measured object again by the imaging device using the acquired exposure control value, transmits the acquired image to the image processing unit, and detects leakage oil by performing the image process by the image processing unit.
Abstract translation: 提供一种漏油检测系统，包括：测量装置，其包括使包含要用紫外线照射的泄漏油附着部的测量对象的光源，以及检测从漏油附件发出的荧光的成像装置 用紫外线照射的部分，对测量对象进行成像; 以及分析装置，其包括控制光源和成像装置的操作的驱动控制单元，记录由成像装置成像的被测量物体的成像图像的记录单元和调用该成像装置的图像处理单元 记录在记录单元中并进行图像处理的成像图像。 成像装置根据成像装置中提供的曝光控制值控制曝光，并且分析装置调用记录在图像处理单元的记录单元中的成像图像，计算成像图像中的各个像素的亮度值，确定 在各像素的亮度值中具有最大值的最大亮度值将最大亮度值与预先确定的参考亮度值进行比较，获取摄像装置的曝光控制值，其中最接近亮度值 小于参考亮度值，利用获取的曝光控制值，通过成像装置再次对被测量物体进行成像，将所获取的图像发送到图像处理单元，并通过图像处理执行图像处理来检测泄漏油 单元。
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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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Patent Agency Ranking
公开(公告)号：US20170301454A1
公开(公告)日：2017-10-19
申请号：US15485855
申请日：2017-04-12
Applicant: HITACHI, LTD.
Inventor： Li LU , Kenichi KAWAMURA , Hiroshi MIYAO , Hiroshi MORITA , Satoshi ICHIMURA , Jun NUKAGA , Shinji FUJITA , Kohei YAMAGUCHI , Hideki OGATA , Masato SUZUKI
IPC: H01F27/28
CPC classification number: H01F27/289 , H01F27/2823 , H01F27/2871 , H01F27/2876 , H01F27/323
Abstract: A stationary induction electrical apparatus includes a disc winding having a structure in which a flow path for a cooling medium is provided between coils where a low voltage is generated between shield wires, an L-shaped insulation barrier is provided between coils where a high voltage is generated between the shield wires, a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, a tip end portion in an axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to a pressboard insulation cylinder, and a height of the tip end portion in the axial direction is lower than a thickness of one coil.
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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：US20200219646A1
公开(公告)日：2020-07-09
申请号：US16638005
申请日：2018-05-15
Applicant: Hitachi, Ltd.
Inventor： Satoshi ICHIMURA , Daigo KOMESU , Shinji FUJITA , Hiroshi MORITA , Li LU
Abstract: An object of the present invention is to provide a stationary induction electric apparatus that can improve insulating performance with a few additional structures. In the stationary induction electric apparatus comprising: an iron core 1; a low-voltage coil conductor 400 wound on the iron core; an insulator 3 enclosing the low-voltage coil conductor; and a high-voltage coil conductor 2 which is wound on the insulator and to which a voltage is applied from the outside, a first shield conductor 5 wound adjacent to the inner peripheral surface of the insulator, a second shield conductor 4 wound adjacent to the outer peripheral surface of the insulator, one end of the first shield conductor, and one end of the second shield conductor are electrically connected to any region of the high-voltage coil conductor.
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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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