In order to provide a cubicle-type gas-insulated switching apparatus having an excellent insulating capability, and wherein electromagnetic force to be generated upon applying electricity thereto is minimized, the cubicle-type gas-insulated switching apparatus comprises: a bus-bar chamber tank and an apparatus-chamber tank that are connected in the up-down direction, and that have insulative gas enclosed therein; a vacuum valve arranged in the vertical direction within the apparatus-chamber tank; plate-formed contacts to be connected to the upper-end and lower-end sections of a valve that also has a shielding function; main circuit conductors within the apparatus-chamber tank that have finger contacts, which are to be intermeshed and connected with the plate-formed contacts, formed on the end sections thereof; and disconnectors connected to each of the main circuit conductors, and which are housed within the bus-bar chamber tank and the apparatus-chamber tank. The plate-formed contacts and the finger contacts are arranged on a line that links each of the plate-formed contacts, and are made to be capable of being abutted-to /separated-from each other from the side direction. The axis lines of the plate-formed contacts, the finger contacts, and the main circuit conductors in the longitudinal direction thereof are positioned in the vicinity of an extension line of an axis line of a movable lead and a fixed lead, which are arranged in opposition to each other within the vacuum valve.
A gas-insulated vacuum breaker configured in such a manner that the pressure in an intermediate-pressure space does not rise to an abnormal pressure value, the intermediate-pressure space being formed to reduce the difference between the inner and outer pressures which acts on a bellows due to a minute leakage from an air-tightness holding section. A pressure monitoring closed chamber (23) is formed on the closed container (37) side filled with an insulative gas, and insulated piping (19) connects the pressure monitoring closed chamber (23) and an intermediate-pressure space (18) which is formed in order to cause an intermediate pressure to act, on the basis of the operation of a movable electrode (5), on a bellows (8) on the surface thereof which is on the opposite side of the vacuum container (2), the bellows (8) retaining the vacuum in the vacuum container (2). The pressure monitoring closed chamber (23) is provided with a pressure monitoring and controlling means for monitoring the pressure in the chamber and performing control for opening the chamber when the pressure exceeds a predetermined set value. The pressure monitoring and controlling means comprises an electromagnetic valve device (28) capable of releasing the inside of the pressure monitoring closed chamber (23) to the atmosphere, a pressure detection device (26) for detecting the pressure in the chamber, and a pressure monitoring device (27) for operating and opening the electromagnetic valve device (28) when the pressure detection device (26) detects a previously set abnormal pressure value.
Provided is an integral three-phase gas insulated switchgear (GIS) which can be constituted without upsizing and can downsize a current transformer unit by an arrangement where a current-carrying conductor intersecting the main section of a current transformer has two turns. Current transformer units (10, 20) are fixed to the upper section and the lower section of the side surface of a vertical container (1) in which the vertical interrupter (2) for three phases is arranged. The main sections (12, 22) of a current transformer for three phases are arranged respectively in the current transformer units (10, 20) so that the lines connecting the centers form a triangle. Current-carrying conductors (3, 4) connected to the upper end or the lower end of the vertical interrupter (2) penetrate the main sections (12, 22) of the current transformer, respectively. The first and second conductor members (31, 41 and 32, 42) of the current-carrying conductors (3, 4) penetrating the main section of the current transformer are connected in series by connection conductor members (33, 34 or 43) so that the current path on the primary of the current transformer has a two turn configuration. The connection conductor member (33, 34 or 43) of each phase is arranged in the space between the main sections (12, 22) of the current transformer.
Disclosed is a compact gas-insulated switching device with a reduced number of components. A large-diameter part (16) is formed in the central part in the axial direction of a rotary shaft (15) which is driven and rotated by an operating device. An insulated operating rod (14) the other end of which is moved in an arc by the rotation of the rotary shaft (15) is formed by cast molding and encases and is formed integrally with the large-diameter part (16) of the rotary shaft (15) in a filler packed with resin. The contact connection part of the insulated operating rod (14) and a movable element (13) is formed for example on an elliptically shaped contact face (21) to contact at almost one point on the central axial line of the movable element (13) during the switching operation.
H02B 13/02 - Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
H01H 33/64 - Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid wherein the break is in gas
Provided is an electrode structure for a vacuum circuit breaker, wherein dielectric breakdown on an outer circumferential section of a contact base arranged at the rear of a contact board is eliminated and interruption performance is further improved. A contact board (11) and a contact base (12) for generating vertical magnetic field are formed of a copper-based alloy, such as a copper-chromium alloy, and on an outer circumferential section of the contact base (12) for generating vertical magnetic field, an outer circumferential section film (17) is arranged by plasma irradiation of chrome, i.e., a high-resistance conductor having a melting point higher than that of the contact board (11).
An electrode material for a vacuum circuit breaker, which can further improve electrical characteristics required for a vacuum circuit breaker. A method for producing the electrode material for a vacuum circuit breaker. An atomized Cu-Cr alloy powder, 20-30% by weight of a thermite Cr powder and 5% by weight of an electrolytic Cu powder are mixed and sintered in the solid phase, thereby obtaining an electrode material for a vacuum circuit breaker, said material containing a solid phase sintered body having a total Cr content of 30-50%. When the electrode material for a vacuum circuit breaker is produced, the powders are mixed, then the powder mixture is compression molded into a compression molded compact, and then the compression molded compact is sintered in the solid phase in a non-oxidizing atmosphere at a temperature not higher than the melting point of Cu, thereby obtaining a solid phase sintered body.
A semiconductor laser can be used as a light source unit in an optical fiber current sensor, and measurement performance is maintained, economic manufacture is possible with reduced costs, and wider dissemination is achieved. An optical fiber (310), which constitutes the light path, goes around the outer periphery of a wire (4) in which the current to be measured flows. Linearly polarized light generated from the laser light of a light source unit (100) equipped with the semiconductor laser passes within the light path, and Faraday’s angle is rotated by the action of the magnetic field of the current to be measured. When the linearly polarized light is divided into orthogonal first and second detection light and the current to be measured is calculated in a calculation processor (140) based on first and second light quantities measured by photodiodes (120, 130), a DC drive current generation unit for generating a DC drive current and a high-frequency drive current generation unit for generating a high-frequency drive current are provided in a light source unit (100). A composite current in which the high-frequency drive current is superimposed on the DC drive current is input to the semiconductor laser, and multimode laser light is emitted. A temperature adjustment unit for adjusting the temperature of the semiconductor laser is also provided in the light source unit (100).
Provided is a gas-insulated switchgear wherein the reliability of the secondary circuit of a transformer is improved to stabilize a power system. A cylindrical bus container (1) is filled with an insulating gas and sealed, and a main circuit conductor (2) is contained therein. The bus container (1) has a flange (3). A transformer container (4) is provided adjacent to the bus container (1). The transformer container (4) comprises an inner cylinder (5) and an outer cylinder (6). Three transformers (11) are provided about an outer surface of the inner cylinder (5) via an insulating cushioning material (10). An insulating gap (9) is formed between the other longitudinal end of the inner cylinder (5) and the bus container (1). A varistor (nonlinear resistor) (15), the resistance of which varies with the magnitude of a voltage applied thereto, is electrically connected by a connecting conductor (16) between the inner cylinder (5) and the outer cylinder (6) on the side of the insulating gap (9). The varistor (15) is rendered conductive when a surge voltage, which is higher than a predetermined value, is applied to thereto.
Provided is an insulating spacer for gas-insulated electrical equipment, said spacer being highly reliable and capable of being economically manufactured, as well as having a simple structure. The insulating spacer (10) comprises a molded insulator (11) having an embedded central conductor (12), wherein the molded insulator (11) part is disposed between the flanges (1A, 2A) of metal containers (1, 2) and is coupled by means of multiple penetrating bolts (5). The external circumference of the molded insulator (11) of the insulating spacer (10) is made smaller than the flanges (1A, 2A), and the insulating spacer (10) is provided with a thin section (11A), one lateral side of which is formed into a thin ring. An annular metal fixture (14) having an L-shaped cross-section is fitted onto the thin section (11A) of the molded insulator (11), said fixture defining the dimensions of the space between the flanges (1A, 2A) and forming a current path between the metal containers (1, 2). The annular metal fixture (14) is affixed to the thin section (11A) of the molded insulator (11) by multiple coupling bolts (15).
Required is a partial discharge detector which is easily installed, which has no possibility to fall off even if external force acts on a signal detecting cable or the like, and which is capable of stably transmitting a signal over a long period of time. Flanges (1A, 2A) of metal containers (1, 2) are connected by a plurality of stud bolts (4) through an insulating spacer (3). An antenna body (10) consisting of a planar antenna (11) and an insulating cover (12) is mounted at least on the outer peripheral surface of the insulating spacer (3). In the antenna body (10), an L-shaped support plate (13) is secured on the upper surface of the antenna body (10) and the support plate (13) is fixed to a mounting plate (15) and a connecting means (16), or is fixed directly to the stud bolts (4).
An electron beam irradiation device for an aperture vessel which significantly improves irradiation efficiency of an electron beam to the aperture vessel to achieve effective sterilization processing, as well as ensures reduced size and economical manufacturing. A rotary carrier (11) is arranged within an irradiation processing bath (10), and a plurality of holding mechanisms (2) for holding an aperture vessel (1) are provided at regular spacing intervals on the outer surface of the rotary carrier. A specific range of a carriage path formed between the irradiation processing bath (10) and the rotary carrier (11) is specified as an irradiation zone, and the inner and outer surfaces of the aperture vessel (1) are sterilized with an electron beam from an electron beam generator means (40) located above the carriage path. A rotary shaft (12) of the rotary carrier (11) is penetrated to a side of the electron beam generator means (40), and a grid plate (45) on an electron beam generation source (41) of the electron beam generator means (40) is rotatably attached to the rotary shaft (12). A plurality of emission outlets (46) are formed on the grid plate (45) at the same spacing intervals as the holding mechanisms (2) on the rotary carrier (11), and the emission outlets (46), an irradiation window (43) on the irradiation processing bath (10) and the holding mechanisms (2) for holding an aperture vessel (1) are located at almost the same vertical line within the irradiation zone.
An electron beam irradiation device for sterilizing a sheet material, wherein at least one surface of a sheet material to be used for manufacturing a paper pack can be sterilized effectively by a low-energy electron beam irradiation means under a reduced-pressure atmosphere, while generation of ozone being avoided. At a carrier path (10) for continuously carrying a sheet material (1), an electron beam irradiation means (20) is arranged in opposition to at least one surface of the sheet material (1), and at least one surface of the sheet material (1) is sterilized using such an electron beam. The carrier path (10) takes shape of a hollow box surrounding the sheet material (1), and has an electron beam irradiation zone (11) at a part of this area, while keeping a reduced-pressure state ranging from 10 to 80,000 Pa using a pressure reduction means (16). Further, the electron beam irradiation zone (11) where the electron beam irradiation means (20) is arranged has at least one sub-zone (12) at each of adjacent hollow box-shaped carrier path (10) at carry-in side and carry-out side of the sheet material, providing the pressure reduction means (16) for depressurizing the sub-zone (12).
Provided is an electron beam irradiating apparatus with a monitor device that can not only determine whether the electron beam irradiation is normal or abnormal but also specifically determine the causes of abnormalities if any, thereby shortening the time required to perform a check operation and that further can determine, by itself, the causes of a plurality of abnormalities if any. The electron beam irradiating apparatus with the monitor device has an electron beam irradiating means for irradiating an electron beam to a to-be-irradiated object in an irradiation chamber. The monitor device comprises an imaging means for imaging a light emitted by irradiating an electron beam to the to-be-irradiated object; a storing means that stores situations of electron beam irradiation in advance; and a calculating means that processes an image, which is captured by the imaging means, to determine a situation of electron beam irradiation. The storing means has stored at least three situations of electron beam irradiation and also has stored image brightnesses associated with those situations of electron beam irradiation. The calculating means acquires the image, which is captured by the imaging means, to compare the acquired image with the image brightnesses stored in the storing means, thereby determining a situation of electron beam irradiation.
There have been demands for wear of the contact surfaces of the movable and fixed electrodes of a vacuum circuit breaker to be reduced, for the withstand voltage capability and the shutoff capability between the electrodes to be improved, and for service life to be extended. Disclosed is a vacuum circuit breaker in which is constructed a valve body (10) with a fixed electrode (12) affixed to the end of a live conductor (13) and a movable electrode (15) affixed to the end of a live conductor (16) inside an insulated container (11), which maintains a vacuum. The operating system which operates the live conductor (13) of the movable electrode (15) is provided with a compression spring (20), and an auxiliary compression spring (21) that increases the initial separation speed of the movable electrode (15). The auxiliary compression spring (21) is disposed such that spring pressure energizing ends during shutoff operation by the movable electrode (15) and such that spring pressure accumulation begins during the turn-on operation.
The invention provides an electrode contact member of vacuum circuit breaker which is obtained by forming a thick Cr fine dispersion layer on the surface of a Cu-Cr alloy base metal and which brings about improved dielectric strength and interrupting performance and a process for easy production of the member though easy formation of a Cr fine dispersion layer. The electrode contact member comprises a Cu-Cr alloy base metal (1) comprising 40 to 80wt% of Cu and 20 to 60wt% of Cr and a Cr fine dispersion layer (2) of 500&mgr;m to 3mm in thickness formed on the surface of the base metal (1) through surface treatment by friction stir processing. The Cr fine dispersion layer (2) is subjected to surface flattening treatment prior to use.
C22F 1/08 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
C22F 1/11 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of chromium or alloys based thereon
Provided is a buffer type gas insulator, which can replace a buffer shaft easily and which can speed up an isolating action thereby to improve the mechanical strength. The buffer type gas insulator is constituted by arranging an isolating portion (2) in a container (1) to be filled with an insulating gas. This isolating portion (2) includes at least main contact elements (3) and (6) on a stationary side and on a movable side, arc contact elements (4) and (7) on the stationary side and on the movable side, a buffer device for compressing the insulating gas, and an insulating nozzle (10) for blowing an insulating gas to the arc which is generated between the individual arc contact elements (4) and (7). The insulating gas, which is blown to the arc so that it takes a high temperature, is discharged through a cylindrical buffer shaft (11). This buffer shaft (11) is constituted of a pipe member (11a) having the arc contact element (7) at its one end, and an end member (11b) formed by jointing its one end separably to the pipe member (11a) at a connected portion (11d) and by connecting its other end to a rod (12) leading to the side of an operator.
H01H 33/915 - Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by, or in conjunction with, the contact-operating mechanism the arc-extinguishing fluid being air or gas with closed circuit of air or gas
17.
STERILITY KEEPING METHOD AND APPARATUS FOR STERILIZATION ELECTRON BEAM IRRADIATING DEVICE
Provided are sterility keeping method and apparatus for a simple and economical sterilization electron beam irradiating device, which can prevent a target from being contaminated by germs during the entire irradiation treatment of an electron beam from the sending-in to the sending-out of the target, thereby to keep the sterilized state satisfactory. A pre-pressure adjusting bath (20) and a post-pressure adjusting bath (30) are integrally jointed to the side face portion of an irradiation treatment bath (10), which is equipped with pressure reducing means for keeping a negative pressure state, and rotary carriers (11, 21 and 31) for transferring continuously containers to be irradiated are rotatably arranged in the individual baths. The irradiation treatment bath (10) is equipped with at least one electron beam irradiating means for irradiating the target with the electron beam. Clean air feeding means (50) is connected through a blower duct (51) to the side of the post-pressure adjusting bath (30), and a discharge line (52) is connected to the side of the pre-pressure adjusting bath, thereby to adjust properly the pressure in the post-pressure adjusting bath (30) adjacent to the irradiation treating bath (10) and the pressure in the pre-pressure adjusting bath (20) adjacent to the irradiation treating bath (10).
[PROBLEMS] To stop the movable contact part of a ground disconnector at each position by a simplified operating mechanism. [MEANS FOR SOLVING THE PROBLEMS] A rotating panel (31) is rotated according to the rotation of a drive part (36). A spindle (4) is rotated by the rotation of the rotating panel (31). Stopping parts such as a ground hole (31C) are formed in the rotating panel (31) so that the movable contact part (7) is stopped at positions such as a connection position (A), a disconnection position (B), and a ground position (C). A plunger (41) is engaged with the ground hole (31C) to stop the rotating panel (31) at a specified position. Consequently, the movable contact part (7) can be maintained at each position in a stopped state by the simple mechanism in which merely the stopping parts are formed in the rotating panel (31).
H01H 31/02 - Air-break switches for high tension without arc-extinguishing or arc-preventing means Details
H01H 31/28 - Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
Provided is a breaker, which can match different breaking rate specifications and which is made common and standard in a spring operation mechanism thereby to reduce the number of steps of designing and manufacturing the breaker. This breaker comprises a power transmission mechanism for bringing a movable contact element (63) and a stationary contact element (62) constituting an ON/OFF contact, into and out of contact with each other, a breaking spring (26) for applying a driving force in a direction to release the movable contact element (63) from the stationary contact element (62) through the power transmission mechanism, a latch mechanism for constricting the motion of the power transmission mechanism at a position to hold the biasing state of the breaking spring (26), and a pullout operation unit for releasing the constriction of the power transmission mechanism by the latch mechanism. The pullout operation unit includes activation means and is arranged to confront a first arm of a lever thereby to turn the first arm. The lever includes a second lever arranged to have its leading end retained by the latch mechanism, and is turned to release the constriction of the power transmission mechanism by the latch mechanism. Moreover, the length size from the turning center of the first arm of the lever to the operation axis of the activation means, and the gap between the first arm of the lever and the activation means are different according to the breaking rate specifications.
[PROBLEMS] To prevent a bellows of a vacuum circuit breaker of tank type from being damaged, reduce the size of the vacuum circuit breaker, and prevent global warming from occurring. [MEANS FOR SOLVING THE PROBLEMS] A high-pressure dry air is fed into a ground tank (2). A movable contact case (8) is supported at one end inside the ground tank (2) through an insulating supporting tube (5) and an insulating support (7), and a fixed contact case (9) is supported at the other end inside the ground tank (2) through a supporting insulator (6). A vacuum interrupter (10) is supported between the contact cases (8, 9). Bush terminals (20, 21) are connected to the top ends of conductors (35, 15) the bottom ends of which are connected to the contact cases (8, 9). The conductors (35, 15) are surrounded by the bushes (16, 17). The movable conductor (35) is formed in a pipe shape. Hermetical seal parts (37 to 41) are so formed that the inner peripheral side of a bellows (25) the outside of which is vacuum, the inside of the movable conductor (35), the inside of the support (7), and the inside of the movable contact case (8) is kept at the atmospheric pressure and the inside of the insulating support tube (5) is filled with the high-pressure dry air.
To ensure a surface pressure on the interface between the insertion hole in a bushing and a rubber mold body to prevent a void from occurring. The inventive bushing (2) is provided with an insertion hole (3a) for housing an arrester mold body (6), and a tapered insertion hole (53a) spreading in a conical shape from the high pressure side of the bushing (2) to the low pressure side is provided in a region where electric field of the insertion hole (3a) concentrates. The arrester mold body (6) is provided with a rubber mold body (67) consisting of silicone rubber or the like integrally molded around the outer periphery of an arrester element laminate (61), and the rubber mold body (67) is provided with a conical portion (67b) to be able to be fitted to the tapered inner surface of the tapered insertion hole (53a).
H02B 13/02 - Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
H01C 7/10 - Non-adjustable resistors formed as one or more layers or coatingsNon-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
There are provided an electron beam application method and an electron beam application device capable of uniformly applying electron beams to an object even if the electron beams have a low energy. For this, electron beams (EB) are applied to a beverage container (30) (object) within a magnetic barrier (MF) formed by combining a plurality of magnetic fields generated in an electron beam application region.
G21K 5/04 - Irradiation devices with beam-forming means
A23L 3/26 - Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
Disclosed is a base agent for electrical insulating oils, which mainly contains an esterified product of glycerin and a linear or branched, saturated or unsaturated fatty acid having 6-14, preferably 8-12 carbon atoms. This base agent for electrical insulating oils is excellent in electrical characteristics, oxidation stability, cooling characteristics, flame retardance and safety. In particular, this agent for electrical insulating oils can meet energy/environmental problems by using an edible oil and fat, which is obtained by using a fatty acid derived from a vegetable oil as a raw material, as the linear or branched, saturated or unsaturated fatty acid having 6-14 carbon atoms.
H01B 3/20 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
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