Abstract: Operating shaft 4 allows disconnecting switch-side and earthing switch-side moving contacts 7a and 7b to linearly reciprocate with the rotation of operating shaft 4. Operating shaft 4 has two-hole lever 5 allow an arc motion. Each one end of two curved links 6a and 6b is connected to two-hole lever 5 and the other end of two curved links 6a and 6b is respectively connected to the disconnecting switch-side moving contact or the earthing switch-side moving contact. When the two connecting points are axisymmetric with respect to the bisector, both the disconnecting switch and the earthing switch are in an open state; when two-hole lever 5 moves at a predetermined angle to the disconnecting switch-side, the disconnecting switch is in a closed state; and when two-hole lever 5 moves at a predetermined angle to the earthing switch-side, the earthing switch is in a closed state.

Abstract: A large-capacity vacuum circuit breaker that can increase a current shutdown capacity and enables its rated current to be increased includes at least two vacuum circuit breaker units placed side by side and connected in parallel. The two vacuum circuit breaker units are operated by a single common operating unit to concurrently perform current shutdown operations. Each vacuum circuit breaker unit has a vertical magnetic field generating means for generating a vertical magnetic field when an operation to shut down current is performed. The vertical magnetic field generating means is formed by vertical magnetic field electrodes provided in a vacuum container of each of the vacuum circuit breaker unit units or by an external coil provided on the outer circumference of each vacuum container.

Abstract: The electron beam irradiating apparatus with the monitoring device has an electron beam irradiating means for irradiating materials in an irradiation chamber. The monitoring device has a photographing means for imaging a lights emitted by irradiating an electron beam to the materials; a storage means that stores state of electron beam irradiation in advance; and a calculating means that processes an image, which is captured by the photographing means, to decide a state of electron beam irradiation. The storage means has stored at least three state of electron beam irradiation and also has stored image luminance associated with those states of electron beam irradiation. The calculating means loads the image, which is captured by the photographing means, to compare the loaded image with the image luminance stored in the storage means, thereby deciding a state of electron beam irradiation.

Abstract: The apparatus has a rotating body 11 in an irradiation processing chamber 10. Outside the rotating body 11, plural retaining mechanisms 2 are installed at regular interval to retain open-mouthed containers. Above the conveying path, an electron beam generating means 40 is arranged. The rotating body 11 has a rotary shaft 12 that penetrates into the electron beam generating means 40. On the rotary shaft 12, a grid plate 45 of an electron beam source 41 of the electron beam generating means 40 is rotatively installed. On the grid plate 45, plural emission holes 46 are provided at the same interval as that of the retaining mechanisms 2 on the rotating body 11. In an predetermined irradiation area, the emission holes 46 and a irradiation windows 43 on the irradiation processing chamber 10 and the retaining mechanism 2 for holding the container are aligned approximately on the same axes.

Abstract: 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.

Abstract: Sealed chamber for monitoring pressure 23 is provided on sealed tank 37. Sealed tank 37 is filled with insulating gas. And, a connection using insulated pipe 19 is provided between medium-pressure space 18 that makes a medium pressure and sealed chamber for monitoring pressure 23. In sealed chamber for monitoring pressure 23, a pressure monitoring and controlling means is provided for monitoring the internal pressure thereof to activate the pressure-release control in response to the situation where the monitored internal pressure has reached the predetermined setting value. The pressure monitoring and controlling means includes solenoid valve 28 that is capable of opening sealed chamber for monitoring pressure 23 to the atmosphere, pressure detector 26 that detects the internal pressure, and pressure monitor 27, which activates solenoid valve 28 for pressure-release when pressure detector 26 detects that the internal pressure has reached the predetermined abnormal pressure value.

Abstract: A vacuum circuit breaker includes a movable-side conductor that is tubular and comprises an inside cavity. A movable side contact case includes a chamber which communicates with a space on a non-vacuum side of a bellows. The chamber is isolated from a space filled with insulating gas in a ground tank by a sealing device. The chamber communicates with an outside atmosphere through the inside cavity of the movable-side conductor.

Abstract: Operating shaft 4 allows disconnecting switch-side and earthing switch-side moving contacts 7a and 7b to linearly reciprocate with the rotation of operating shaft 4. Operating shaft 4 has two-hole lever 5 allow an arc motion. Each one end of two curved links 6a and 6b is connected to two-hole lever 5 and the other end of two curved links 6a and 6b is respectively connected to the disconnecting switch-side moving contact or the earthing switch-side moving contact. When the two connecting points are axisymmetric with respect to the bisector, both the disconnecting switch and the earthing switch are in an open state; when two-hole lever 5 moves at a predetermined angle to the disconnecting switch-side, the disconnecting switch is in a closed state; and when two-hole lever 5 moves at a predetermined angle to the earthing switch-side, the earthing switch is in a closed state.

Abstract: Vertical type tank 1, in which vertical type interrupters 2 for three phases are arranged, has current transformer units 10 and 20. Main sections of current transformer 12 and 22 for three phases are respectively arranged in current transformer units 10 and 20 so that the lines connecting their centers form triangle. Current-carrying conductors 3 and 4 connected to vertical type interrupter 2 are made to pass through main section 12 and 22, respectively. Each of current-carrying conductors 3 and 4 is connected to first and second conductor members 31, 41 and 32, 42, which pass through the main section and connected severally and respectively by connection conductor members 33, 34, and 43, so that the current path on the primary of the current transformer form a two-turn winding. Connection conductor members 33, 34 and 43 of each phase are arranged in the space between main section 12 and 22.

Abstract: Contact plate 11 and Contact base for generating axial magnetic field 12 are made of copper-based alloy such as copper-chromium alloy for example. On the periphery of contact base for generating axial magnetic field 12, Outer circumferential section film 17 is provided. Outer circumferential section film 17 is formed by plasma irradiation of chromium that is a arcing part having a melting point higher than the melting point of contact plate 11.

Abstract: Bus container 1 of cylindrical shape is filled with insulating gas and main circuit conductor 2 is housed with bus container 1 in taut condition. Bus container 1 has flange 3. Current transformer container 4 is installed adjacently to bus container 1. Current transformer container 4 includes inner cylinder 5 and outer sealing member 6. On the periphery of inner cylinder 5, three current transformers 11 are provided interposing insulative cushioning material 10. Other longitudinal end of inner cylinder 5 and bus container 1 are arranged so that insulation gap 9 is formed in between. Between inner cylinder 5 and outer sealing member 6 on insulation gap 9 side, varistor 15 of which resistance varies depending on a applied voltage is electrically connected through bonding conductor 16. Varistor 15 turns into a conducting state when a surge voltage over a predetermined intensity is applied.

Abstract: Atomized Cu—Cr alloy powder, 20 to 30 percent by weight of Thermite Cr powder and 5 percent by weight of electrolytic Cu powder are mixed together and undergo solid phase sintering treatment to form an electrode material for vacuum circuit breakers. The gross content of Cr of the electrode material is 30 to 50 percent by weight. In manufacturing the electrode material for vacuum circuit breakers, such powders are mixed together and then undergo compression molding to be formed into a compressed compact. The compressed compact is performed solid phase sintering at a temperature lower than the melting point of Cu in a non-oxidizing atmosphere to prepare a solid phase sintered body.

Abstract: 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 having 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 the support plate 13 is fixed directly to the stud bolts 4.

Abstract: The apparatus has a rotating body 11 in an irradiation processing chamber 10. Outside the rotating body 11, plural retaining mechanisms 2 are installed at regular interval to retain open-mouthed containers. Above the conveying path, an electron beam generating means 40 is arranged. The rotating body 11 has a rotary shaft 12 that penetrates into the electron beam generating means 40. On the rotary shaft 12, a grid plate 45 of an electron beam source 41 of the electron beam generating means 40 is rotatively installed. On the grid plate 45, plural emission holes 46 are provided at the same interval as that of the retaining mechanisms 2 on the rotating body 11. In an predetermined irradiation area, the emission holes 46 and a irradiation windows 43 on the irradiation processing chamber 10 and the retaining mechanism 2 for holding the container are aligned approximately on the same axes.

Abstract: An insulating spacer 10 includes a molded insulator 11 having a central conductor 12. The molded insulator 11 part is disposed between the flanges 1A, 2A of metal containers 1, 2 and is coupled by through bolts 5. The peripheral dimension of the molded insulator 11 is 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 shape. A ring-shaped metal fitting 14 having a cross-sectional L-shape is fitted onto the thin section 11A of the molded insulator 11, the ring-shaped metal fitting 14 defining the dimensions of the space between the flanges 1A, 2A and forming a current path between the metal containers 1, 2. The ring-shaped metal fitting 14 is affixed to the thin section 11A of the molded insulator 11 by multiple tightening bolts 15.

Abstract: At a conveying 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 conveying path 10 takes shape of a hollow box surrounding the sheet material, and has an electron beam irradiation area 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 area 11 where the electron beam irradiation means 20 is arranged at least one sub area 12 at each of adjacent hollow box-shaped conveying path 10 at carry-in side and carry-out side of the sheet material, providing the pressure reduction means 16 for depressurizing the sub area 12.

Abstract: The electron beam irradiating apparatus with the monitoring device has an electron beam irradiating means for irradiating materials in an irradiation chamber. The monitoring device has a photographing means for imaging a lights emitted by irradiating an electron beam to the materials; a storage means that stores state of electron beam irradiation in advance; and a calculating means that processes an image, which is captured by the photographing means, to decide a state of electron beam irradiation. The storage means has stored at least three state of electron beam irradiation and also has stored image luminance associated with those states of electron beam irradiation. The calculating means loads the image, which is captured by the photographing means, to compare the loaded image with the image luminance stored in the storage means, thereby deciding a state of electron beam irradiation.

Abstract: Vacuum circuit breakers are to gain an extended lifetime by reducing contact face damage of moving and fixed electrodes with improved voltage withstand performance therebetween and enhanced interruption performance. Vacuum circuit breaker of the present invention has bulb 10 having: insulative vacuum tube 11; and fixed electrode 12 on end of current-carrying conductor 13 and moving electrode 15 on end of another current-carrying conductor 16 arranged in insulative vacuum tube 11 with their electrode contact faces opposed each other. Operation system for manipulating current-carrying conductor 16 of moving electrode 15 is equipped with compression-spring 20 and auxiliary compression-spring 21 that increases initial opening speed of moving electrode 15. Auxiliary compression-spring 21 ceases energizing in the middle of a circuit breaking movement of moving electrode 15 and begins storing spring energy in the middle of a circuit closing movement of the same.

Abstract: A circuit breaker of different interruption speeds, and a spring operation mechanism is standardized for designing and manufacturing the circuit breaker. The circuit breaker has a power transmission mechanism for driving a movable contact 63 and a fixed contact 64 and an interruption spring 26 that imparts a driving force to separate the contacts through the power transmission mechanism. A latch mechanism restricts movement of the power transmission mechanism, and a pull-out operation section releases the restriction of the power transmission mechanism by the latch mechanism. The pull-out operation section is arranged to oppose a first arm of a lever to rotate the first arm. The lever is arranged so that a tip of a second arm is able to engage with and rest on the latch mechanism, and release the restriction of the power transmission mechanism by the latch mechanism.