Abstract: A gas circuit breaker of an embodiment includes a sealed container, a first contact part and a second contact part, an operation mechanism, an insulating nozzle, a pressure accumulator, and an electric field shield. The insulating nozzle is displaced in conjunction with the first contact part in a separation process of the first contact part and the second contact part. The insulating nozzle surrounds arc discharge generated between the first contact part and the second contact part. The electric field shield is attached to the insulating nozzle. The electric field shield has a floating potential during a period of at least part of the separation process. The electric field shield is electrically connected to the second contact part such that the electric field shield has the same potential in a completely open electrode state in which separation between the first contact part and the second contact part is terminated.

Abstract: Disclosed is a supporting structure of a closing resistor unit for a circuit breaker which connects the closing resistor unit to the fixed portion through the first supporting plate and the second supporting plate to allow the closing resistor unit to move back and forth with respect to the fixed portion through the first supporting plate and to move up and down with respect to the fixed portion through the second supporting plate, whereby the closing resistor unit or its joints may be prevented from being damaged from impact.

Abstract: A circuit breaker, or transformer, or insulated bus for use with AC voltages greater than 30 kilovolts and AC currents greater than 400 amperes includes an elongated bushing made from electrically insulating material and having first and second ends. The first end of the bushing is coupled to a main enclosure of the circuit breaker, or transformer, or insulated bus and a terminal pad is coupled to the second end of the bushing. A conductor is disposed in an internal cavity of the bushing in spaced relation to an internal wall of the bushing that defines the internal cavity. The conductor includes first and second segments. A first end of the first segment is electrically connected to a contact of the circuit breaker, or transformer, or insulated bus and a first end of the second segment is electrically connected to the terminal pad. Second ends of the first and second segments are coupled together with a biasing element interposed between the second ends of the first and second segments.

Abstract: The present invention includes a wear-resistant material including: a base material formed of pure aluminum or an aluminum alloy having a finely asperity structure on a surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the surface of the base material. Further, the present invention including a puffer cylinder including: a finely asperity structure on an inner-wall surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the inner-wall surface of the puffer cylinder. The present invention also includes a puffer-type gas circuit breaker includes the above puffer cylinder.

Abstract: Provided is a gas circuit breaker. The gas circuit breaker includes a fixed part, a movable part, a piston, and a double compression mechanism. The fixed part includes a fixed arc contact and a first fixed contact maker. The movable part includes a movable arc contact selectively making contact with the fixed arc contact, a cylinder in which the movable arc contact is disposed, and a second fixed contact maker guiding a movement of the cylinder. The piston is disposed in the second fixed contact maker. The double compression mechanism is configured to move the piston in a direction opposite to a moving direction of the movable part when the movable part is moved to separate the fixed arc contact and the movable arc contact for interrupting a fault current.

Abstract: A gas-circuit breaker includes a cylinder, a stationary piston, and a moving piston. The cylinder has a moving contact that is fixed on one end of a rod and has a gas exhaust that faces a stationary contact. The rod is inserted into the cylinder. The stationary piston is fixed to the container, and is fitted in an opening of the cylinder to create a puffer chamber. Due to movement of the rod, the stationary piston compresses arc-extinguishing gas, and the gas blows onto the arc through gas exhaust. The moving piston partitions the puffer chamber into a first puffer chamber and a second puffer chamber. Sliding of the moving piston changes the capacity of the first puffer chamber and the second puffer chamber according to the difference in pressure in the first puffer chamber and the second puffer chamber.

Abstract: A gas-circuit breaker includes a cylinder, a stationary piston, and a moving piston. The cylinder has a moving contact that is fixed on one end of a rod and has a gas exhaust that faces a stationary contact. The rod is inserted into the cylinder. The stationary piston is fixed to the container, and is fitted in an opening of the cylinder to create a puffer chamber. Due to movement of the rod, the stationary piston compresses arc-extinguishing gas, and the gas blows onto the arc through gas exhaust. The moving piston partitions the puffer chamber into a first puffer chamber and a second puffer chamber. Sliding of the moving piston changes the capacity of the first puffer chamber and the second puffer chamber according to the difference in pressure in the first puffer chamber and the second puffer chamber.

Abstract: A circuit-breaker includes two contacts which are disposed in an interrupting space filled with a dielectric gas under pressure and between which an electric arc strikes during circuit-breaker opening, a thermal blast chamber communicating directly with the interrupting space, and a piston-driven compression chamber communicating with the thermal blast chamber. The piston-driven compression chamber communicates with the interrupting space via a discharge channel that is separate from the thermal blast chamber and that is closed by a discharge valve.

Abstract: The arc blast switch can have single or dual contact movement and possesses a break chamber with low gas compression, the switch includes a first contact and a second contact, the first contact being movable in a longitudinal axis and being secured to the break chamber in which the gas is compressed by a piston. A device for displacing the piston is arranged so that its movement changes direction inside the case of the switch after the gas compression stage, and the device includes a telescopic link connected to the piston. The length of the displacement of the piston inside the case during the compression stage is not less than the length of the displacement of the first contact during the compression stage.

Abstract: The arc blast switch can have single or dual contact movement and possesses a break chamber with low gas compression, the switch comprises a first contact and a second contact, the first contact being movable in a longitudinal axis and being secured to the break chamber in which the gas is compressed by a piston. Means for displacing said piston are arranged so that its movement changes direction inside the case of the switch after the gas compression stage, and said means include a telescopic link connected to said piston. The length of the displacement of the piston inside said case during said compression stage is not less than the length of the displacement of said first contact during said compression stage.

Abstract: This power circuit-breaker has at least one cylindrically constructed arcing chamber which is provided with a stationary contact, with a moving contact and with a quenching zone between the two contacts. A shaft of the moving contact is permanently connected to a blowout volume which is closed off on the stationary contact side by an insulating nozzle through which at least one flow channel passes. The arcing chamber has a first compression volume which is operatively connected to the blowout volume and to a second compression volume. It is intended to provide a power circuit-breaker in which the blowing-out of the arc with pure SF.sub.6 gas is made stronger. This is achieved by providing a moving auxiliary piston between the first compression volume and the second compression volume and by the auxiliary piston being connected to the moving contact via a direction-changing device.

Abstract: In a gas-blast switch with a compression device with a compression piston and a compression cylinder, at least one of which can be moved by the drive during the cut-off process, starting from a cut-in position, reducing a compression space delimited by them, the initial quenching gas pressure is increased in that the compression piston is moved toward the compression cylinder in advance. In order to take advantage of the magnetic effect of the break current, an armature which can be moved by the magnetic field of a stator which can be excited by the break current is provided, producing a pressure influence causing the advance movement of the compression piston via a compression chamber.

Abstract: A gas-dielectric high-tension interrupter of the arc-puffer type in which the puff of gas is brought about by the combined effect of an excess pressure developed in a compression chamber and intensified by the heating caused by the arc radiation, which is optically guided from an arcing chamber to the compression chamber, and of the vacuum developed in a suction chamber which is put into communication with the arcing chamber at a predetermined minimum arcing time (TAM).

Abstract: A circuit-breaker including two arcing contacts that co-operate with each other, at least one of which is part of a moving contact assembly that is secured to a drive member and that is constituted by a first tube carrying the moving arcing contact at its end, and by a second tube that is coaxial with the first tube so as to define firstly an expansion chamber on one side of an annular wall, and secondly a compression chamber on the other side of the annular wall, the compression chamber being closed by a piston. A compression device is provided for compressing the gas in the compression chamber during a first portion of the displacement of the moving contact assembly, and a pressure-reducing device is provided for reducing the pressure of the gas in the compression chamber during a second portion of the same displacement of the moving contact assembly.