Hitachi, Ltd.

Akira Yamagishi

Li Lu

Akira Nishimizu

Toshiaki Rokunohe

Satoshi Ichimura

Jun Nukaga

Naoya Miyamoto

Tomohiro Moriyama

Yasutomo Saito

Yoshio Hamadate

Yasunori Ono

Kenichi Kawamura

Naoyuki Kurita

Chie Kobayashi

Mao Kawamoto

Shigeru Kakugawa

Kohei Yamaguchi

Kohhei Aida

Hisashi Morooka

Takahide Matsuo

Hiroshi Miyao

Taku Oyama

Yasunori Oono

Youichirou Yamada

Hideyuki Miyahara

The present invention is directed to a leakage oil detection device for detecting leakage oil in an oil filled apparatus including: a light source configured to irradiate the apparatus; an imaging device configured to capture an image of the apparatus; a control device configured to control operations of the light source and the imaging device; a storage device configured to store a captured image; an image processing device configured to process the stored image; and a display device configured to display a processing result. The light source and the imaging device are arranged to capture specular reflection light from a surface of the apparatus as a target object. The image processing device recognizes a brightest portion and an adjacent dark portion on the image as leakage oil adhesion portions when a three-layer structure of luminance having bright portions having different luminances and a dark portion is observed in the image.

Leakage oil detection device and leakage oil detection method

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.

Work terminal, oil leakage detection apparatus, and oil leakage detection method

The invention provides a core for a stationary induction apparatus including an amorphous core formed of an amorphous thin magnetic strip arranged inside the core, a silicon steel sheet core formed of a silicon steel sheet arranged on a side surface of the amorphous core, a wear plate arranged on the outermost peripheral surface of the silicon steel sheet core, an amorphous core frame arranged around the amorphous core including a space between the amorphous core and the silicon steel sheet core, and a support frame which supports and fixes the amorphous core and the silicon steel sheet core via the wear plate.

Core for stationary induction apparatus

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.

Oil leakage detector and oil leakage detection method and image processing unit

A stationary induction apparatus includes a main body tank and a stationary induction apparatus main body. The main body is accommodated in the tank. An electrostatic shield ring is placed on the upper and lower end parts of a winding. An electrostatic shield ring has a magnetic ring and two insulating rings vertically fixing the magnetic ring for a spool. A conductive tape is laid on an insulating tape. These tapes are wound around the spool. An insulating tape is wound around the wound tapes. The width of the insulating tape is equal to or greater than the width of the conductive tape. One end of the conductive tape is connected to one end part of the winding and to the magnetic ring. A gap is provided at at least one place on the magnetic ring. The winding direction of the conductive tape is inverted at at least one place.

Stationary induction apparatus

An object of the present invention is to improve a mechanical strength and to ensure a low magnetic loss without using a supporting member even when amorphous ribbons are used for an inner core. To attain the object, a stationary induction apparatus core of the present invention includes an inner core formed from the amorphous ribbons and outer cores formed from silicon steel sheets, the outer cores being disposed on two sides of the inner core in a depth direction as opposed to a standing direction of the inner core in such a manner as to sandwich the inner core therebetween.

Stationary induction apparatus core

To provide a safe stationary induction electrical apparatus that prevents a fragment coming off a magnetic shield, wound around an iron core leg portion of the stationary induction electrical apparatus, due to vibrations from being released in a tank accommodating the stationary induction electrical apparatus and thus prevents a trouble such as dielectric breakdown. Moreover, to provide a stationary induction electrical apparatus that does not need to be changed in the dimensions of an iron core for securing an insulation distance due to the placement of a magnetic shield and can reduce a compressive force generated in a winding. A magnetic material is provided in the interiors of insulating members whose interiors are hollow and which are provided in the vicinities of upper and lower ends of the winding wound around the iron core leg portion of the stationary induction electrical apparatus.

Stationary induction electrical apparatus

A stationary induction apparatus includes a cooled magnetic material ring disposed in an end portion of each winding and that can reduce an electromagnetic-mechanical force and improve reliability. The apparatus includes an iron core; a winding outside of the iron core; a plurality of iron core clamps that sandwich the winding from a longitudinal direction of the iron core; a magnetic material ring with a silicon steel plate wound outside of the iron core; a laminated magnetic material composite ring including an insulator on an outer circumference of the magnetic material ring; and a holding-and-cooling structure between the winding and the laminated magnetic material composite ring, in which a portion of the holding-and-cooling structure protruding from between the winding and the laminated magnetic material composite ring extends in the longitudinal direction, and the holding-and-cooling structure is a recess with respect to the winding and the laminated magnetic material composite ring.

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.

Diagnosing device for on-load tap changing apparatus, diagnosing method for on-load tap changing apparatus, and diagnosing device for transformer

A transformer of the invention includes a core which includes a main leg, a side leg, and a yoke, and a winding wire () which is wound around the main leg of the core, inside a tank () which is filled with an insulating medium, the main leg of the core includes a main wound core () having a square cross-section which is formed by winding the amorphous magnetic ribbon and a sub wound core () constituted by silicon steel plates which are stacked with curvatures provided at four sides thereof, and a cross-section of a part, where the winding wire () is disposed, in the main leg is approximately a circular shape.

Transformer

A leakage oil detection system includes a measurement device including 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 to detect leakage oil.

Leakage oil detection system

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.

Leakage oil detector system and method

Electrical insulating paper according to an embodiment of the present invention is used while being immersed in electrical insulating oil, and includes a paper base material mainly containing cellulose, an adsorption layer formed on an entire surface of the paper base material by adsorption, and a moisture barrier layer formed by being chemically bonded to the adsorption layer. The moisture barrier layer includes an amphipathic molecule containing both a hydrophobic hydrocarbon group and a hydrophilic functional group in one molecule. The amphipathic molecule is chemically bonded to the adsorption layer via the hydrophilic functional group. The hydrophobic hydrocarbon group covers the surface of the paper base material.

Electrical insulating paper and stationary induction electrical apparatus using the same

A stationary induction electric apparatus includes an iron core having legs of core and yokes of core; windings wound around the legs of core; coolant for cooling the windings; a cylindrical insulation structure that forms a flow of the coolant around the windings; baffle members alternately provided on the inner wall side and the outer wall side of the cylindrical insulation structure; and adjustment members for constricting the flow of the coolant. The adjustment members are provided on the same side of the respective baffle members and on the respective baffle members.

Growing community of inventors

Tokyo, Japan

Akira Yamagishi