Meidensha Corporation

Other

Tc-Tanic, Incorporated

Kaoru Kitakizaki

Keita Ishikawa

Shota Hayashi

Toshimasa Fukai

Nobutaka Suzuki

Kosuke Hasegawa

Eiichi Takahashi

Toru Tanimizu

Toshinori Tatsumi

Yuichi Nishikiori

Noboru Oyama

Osamu Hatozaki

Takayuki Noguchi

Yoshihito Watanabe

Masanori Haba

Tetsu Tatsuma

Takayoshi Tanimura

Kazuhiro Nagatake

Toru Nishizawa

Disclosed is a vacuum circuit breaker () including a vacuum interrupter () accommodated in a ground tank () filled with insulating gas. At least one of a fixed electrode () and a movable electrode () of the vacuum interrupter () uses an electrode material in which particles containing a solid solution of a heat resistant element and Cr are finely and uniformly dispersed and in which Cu textures as a high conductive component are finely and uniformly dispersed. The electrode material contains 20 to 70% by weight of Cu, 1.5 to 64% by weight of Cr and 6 to 76% by weight of the heat resistant element relative to a weight of the electrode material. The particles of the solid solution in the electrode material have an average particle size of 20 &#x3bc;m or smaller.

Vacuum circuit breaker

A process for producing an electrode material by infiltrating a highly conductive metal such as Cu into a porous object containing heat-resistant elements. Before an infiltration step in which the highly conductive metal is infiltrated, a HIP treatment is given to a powder containing the heat-resistant elements (or to a molded object obtained by molding a powder containing the heat-resistant elements). The composition is controlled so that the HIP treatment yields a porous object which has a degree of filling of 70% or higher, more preferably 75% or higher. The highly conductive metal is infiltrated into the porous object having the controlled composition.

Process for producing electrode material, and electrode material

What is disclosed is an electrode material including a sintered body containing a heat resistant element and Cr and being infiltrated with a highly conductive material. A powder mixture of a heat resistant element powder and a Cr powder is subjected to a provisional sintering in advance, thereby causing solid phase diffusion of the heat resistant element and Cr. After a Mo&#x2014;Cr solid solution obtained by the provisional sintering is pulverized, the pulverized Mo&#x2014;Cr solid solution powder is molded and sintered. A sintered body obtained by sintering is subjected to a HIP treatment. The highly conductive metal is disposed on the sintered body after the HIP treatment, and infiltrated into the sintered body by heating at a predetermined temperature. By conducting the HIP treatment, the withstand voltage capability and current-interrupting capability of the electrode material are improved.

Method for manufacturing electrode material and electrode material

A method for producing an electrode material, provided to involve: (i) a provisional sintering step of sintering a mixed powder containing a powder of a heat resistant element and a powder of Cr to obtain a solid solution where the heat resistant element and Cr are dissolved; (ii) a pulverizing step of pulverizing the solid solution to obtain a powder; (iii) a main sintering step of sintering a molded body obtained by molding the powder of the solid solution, to produce a sintered body; and (iv) a Cu infiltration step of infiltrating the sintered body with Cu.

Method for producing electrode material

A method for producing an electrode material, involving: (i) a step of preparing a powder of a solid solution of Cr and a heat resistant material selected from the group consisting of Mo, W, Ta, Nb, V and Zr, wherein either a peak corresponding to Cr element or a peak corresponding to the heat resistant element, which are observed by X ray diffraction measurement made on the powder of the solid solution, disappears; (ii) a step of molding the powder of the solid solution to obtain a molded body and then sintering the molded body to produce a sintered body; and (iii) a Cu infiltration step of infiltrating the sintered body with Cu.

Electrode material

A composite metal where a phase of particles of solid solution is uniformly dispersed in a Cu phase, the solid solution containing a solid solution of a heat resistant element selected from Mo, W, Ta, Nb, V and Zr and Cr. The composite metal is provided to contain: 20-70% of Cu; 1.5-64% of Cr; and 6-76% of a heat resistant element by weight relative to the composite metal, wherein a remainder is comprised of inevitable impurities. In the composite metal, the particles of the solid solution, contained in the composite metal, are provided to have an average particle diameter of not larger than 20 &#x3bc;m and to uniformly disperse in the Cu phase with an index of the dispersion state of not higher than 1.0.

Alloy

[Task] The present invention aims to provide a vacuum capacitor instrument voltage transformer by which current and voltage can be much precisely measured. [Means for achieving task] The means is so made that a main capacitor portionand a voltage dividing capacitor portionare installed in a earthed vacuum vessel, a main ground circuitis provided through which a leak current Iflows from an outer surface of the primary line-path side vacuum vessel to the earth E, and a voltage dividing ground circuitis provided through which a leak current Iflows to the earth E through a voltage dividing insulating cylindrical memberthat is disposed between an earthed portion and each of the main capacitor portion and the voltage dividing capacitor portion.

Vacuum capacitor-voltage-transformer

A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. The fixed electrode is formed from a plurality of electrode members in a vacuum casing. The movable electrode is formed from a plurality of electrode members arranged in gaps formed between the electrode members of the fixed electrode in the vacuum casing. The movable electrode shaft supports the movable electrode. Capacitance appearing between the movable electrode and the fixed electrode is varied by rotation of the movable electrode shaft. The magnetic flux receiving unit rotates the movable electrode shaft in the vacuum casing. The magnetic flux generating unit is located outside the vacuum casing and rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.

Vacuum capacitor

A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. A plurality of electrode members in a vacuum casing form the fixed electrode. The fixed electrode is divided into a plurality of fixed electrodes, and each fixed electrode is lead outside the vacuum casing and electrically connected to each other in series. A plurality of electrode members arranged in gaps between the electrode members of the fixed electrode form the movable electrode. Rotating the movable electrode shaft, which supports the movable electrode, varies capacitance between the movable electrode and the fixed electrode. The magnetic flux receiving unit rotates the movable electrode shaft. The magnetic flux generating unit, located outside the vacuum casing, rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.

The present invention can easily adjust capacitance of a vacuum capacitor while maintaining a vacuum state in a vacuum chamber of the vacuum capacitor. A fixed electrodeis formed by arranging a plurality of flat electrode membersin layers at a certain distance in an axial direction of a vacuum chamber. A movable electrodeis formed by arranging a plurality of flat electrode membersin layers at a certain distance in the axial direction of the vacuum chamberand fixing the electrode membersto a movable electrode shaft. By rotation of the movable electrode shaft, each electrode memberis inserted into and extracted from a gap between the electrode membersof the fixed electrodein noncontact with the electrode membersof the fixed electrode. A magnetic flux receiving portionis fixed to a seal memberside of a disk memberthat is provided at the movable electrode shaft. A magnetic flux generating unitprovided at a capacitance control unitis arranged in a direction parallel to the movable electrode shaftwith respect to the magnetic flux receiving portion. By rotating the capacitance control unitalso rotating the magnetic flux receiving portionby magnetic attraction of the magnetic flux generating unit, an overlap area of the movable electrodewith respect to the fixed electrodeis changed, capacitance is then adjusted.

A QCM sensor including a sensor device, the sensor device having a crystal substrate, on both of front and rear surfaces of which a pair of electrodes are disposed so as to oppose with each other and the QCM sensor detecting and quantitatively analyzing components of a sample from either a variation in a fundamental resonant frequency or a variation in an impedance when a surface of one of the pair of electrodes is immersed into either a sample gas or a sample solution. The sensor device is arranged in a multi-channel structure such that four mutually opposing electrodes ( A through A, B through B) are disposed on both front and rear surfaces of the crystal substrate each electrode being arranged to enable a fixation of a receptor which is different for each component of a sample to be detected and quantitatively analyzed, whereby the QCM sensor detects and quantitatively analyzes once the components of one sample different for different electrodes.

Growing community of inventors

Saitama, Japan

Kaoru Kitakizaki