There is provided a gas circuit breaker that can reduce deformation of an insulation nozzle and leakage of arc-extinguishing gas compressed to be sprayed to an arc, and can more surely maintain electric insulation performance. A gas circuit breaker 1 includes a trigger electrode 31 which is arranged to be movable between a first arc contactor 21 and a second arc contactor 41, which ignites an arc generated between the first arc contactor 21 and the trigger electrode along with a movement in a first half of a current breaking action, and which ignites the arc on the second arc contactor 41 along with the movement in a latter half of the current breaking action, a compression chamber 36 for pressurizing arc-extinguishing gas, the compression chamber 36 being formed by a cylinder 42 which has an outer wall 51 and an inner wall 52, each being formed in a cylindrical shape, and which is provided to the second arc contactor 41, and a piston 33 that slides between the outer wall 51 and the inner wall 52 in conjunction with the trigger electrode 31, and an insulation nozzle 23 that guides the arc-extinguishing gas pressurized in the compression chamber 36 to an arc ignited between the first arc contactor 21 and the second arc contactor 41. The insulation nozzle 23 is supported by the inner wall 52 of the cylinder 42.

A gas circuit breaker 1 includes an insulation nozzle 23 that guides arc-extinguishing gas to an arc between a first arc contactor 21 and a second arc contactor 41 when a trigger electrode 31 becomes an opened state relative to the first arc contactor 21. The second arc contactor 41 has an opening 41a for spraying the arc-extinguishing gas, and the opening 41a is closed by the trigger electrode 31 in the first half of a current breaking action, and is opened by separation of the trigger electrode in the latter half of the current breaking action. An opening area of a first exhaust port 41b formed between the second arc contactor 41 and the insulation nozzle 23 for exhausting the arc-extinguishing gas is 0.2 times or more and two times or less of an opening area of the opening 41a of the second arc contactor 41.

A fluid flow and cooling system and method are provided. The system has a substantially cylindrical tube shape and is configured to be installed in a circuit breaker for allowing the flow of fluids while dissipating heat from said fluids. The system comprises a plurality of openings on each of front and back surfaces, the openings of the front surface being connected to the openings of the back surface by a plurality of side passages. By having a plurality of side passages for the flow of fluids, heat dissipation may be improved compared to previous circuit breakers tubes for dispensing arc quenching fluid. The method cools a fluid flowing in a cooling device having side passages.

A fluid flow and cooling system and method are provided. The system has a substantially cylindrical tube shape and is configured to be installed in a circuit breaker for allowing the flow of fluids while dissipating heat from said fluids. The system comprises a plurality of openings on each of front and back surfaces, the openings of the front surface being connected to the openings of the back surface by a plurality of side passages. By having a plurality of side passages for the flow of fluids, heat dissipation may be improved compared to previous circuit breakers tubes for dispensing arc quenching fluid. The method cools a fluid flowing in a cooling device having side passages.

An electrical switching device includes a switching path and a flow device with a control valve. By way of the flow device, a fluid can flow on the switching path. The control valve additionally has a valve body. The valve body is pressed into a sealing position by the flow pressure of the flowing fluid.

The present invention relates to a device for interrupting non-short circuit currents only, and in particular relates to a disconnector, more particularly high voltage disconnector, or to an earthing switch, more particularly make-proof earthing switch, and further relates to a low voltage circuit breaker. The device comprises at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present. According to the application, a counter-arcing component is allocated to the arcing region, the counter-arcing component being designed for counteracting the generation of an arc and/or being designed for supporting the extinction of an arc.

The present invention relates to a device for interrupting non-short circuit currents only, and in particular relates to a disconnector, more particularly high voltage disconnector, or to an earthing switch, more particularly make-proof earthing switch, and further relates to a low voltage circuit breaker. The device comprises at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present. According to the application, a counter-arcing component is allocated to the arcing region, the counter-arcing component being designed for counteracting the generation of an arc and/or being designed for supporting the extinction of an arc.

A gas-insulated switch has a first contact and a second contact. A contact unit is connected to the first contact as a movement contact unit having a drive unit and is movably mounted along a switch axis. The gas-insulated switch further has a multi-part insulation nozzle system with a primary nozzle and an auxiliary nozzle. A heating channel is formed between the primary nozzle and the auxiliary nozzle. The heating channel originates from an electric arc chamber and opens in a gas reservoir, wherein the gas reservoir is delimited by a ram. The gas reservoir is radially delimited by a wall, in respect of the switch axis, which is not a component of the movement contact unit, and the ram is part of the movement contact unit and is movably mounted such that the ram moves along the switch axis away from the second contact to enlarge the gas reservoir.

Embodiments of the disclosure include systems and methods for providing an electric high-voltage circuit breaker. In one embodiment, a circuit breaker includes a primary chamber; and a compression chamber, wherein the circuit breaker further includes a valve configured to control a fluid flow between the primary chamber and the compression chamber, wherein the valve includes a valve body, a first valve plate that is arranged axially movable with respect to the valve body, and a second valve plate that is arranged between and movable with respect to the valve body and the first valve plate, wherein said first valve plate includes at least one opening enabling the fluid flow through the first valve plate, wherein a first surface of the valve body forms a valve seat for the first valve plate, and wherein a first surface of the first valve plate forms a valve seat for the second valve plate.

The present invention relates to a method for controlling a motor-driven vacuum circuit breaker. The method comprises initiate opening (S100) the circuit breaker, wherein the circuit breaker moves with an average opening speed of a contact pair of the circuit breaker, from a closed position to an open position of the circuit breaker, and decelerating (S110) the opening speed of the contact pair to below the average opening speed before the open position is reached to avoid overshoot, and initiate closing (S120) the circuit breaker, wherein the circuit breaker moves with an average closing speed of the contact pair, from the open position to the closed position, and decelerating (S130) the closing speed of the contact pair to below the average closing speed before contact touch at the closed position, wherein the circuit breaker moves with the decelerated speed at contact touch. A motor-driven vacuum circuit breaker, a computer program and a computer program product are also presented.