Abstract: A vacuum circuit breaker serving as a switch includes a pair of electrodes that serve as a stationary electrode and a movable electrode, a handler including a movable shaft and a housing that operate as a first mover in withdrawing the movable electrode from the stationary electrode and closing the movable electrode toward the stationary electrode, a movable shaft that is connected as a second mover to the movable electrode, a coil spring that is connected as an elastic between the first mover and the second mover to press the movable electrode against the stationary electrode, and a shock absorber that attenuates as an attenuator contraction of the elastic when the movable electrode is withdrawn from the stationary electrode.

Abstract: A vacuum circuit breaker includes: an insulating rod disposed within a grounded tank; a drive conductor connected to the insulating rod; a first bushing and a second bushing connected to the side of the grounded tank; vacuum valves including movable contacts; levers rotatably coupled at end portions on one side to the insulating rod or the drive conductor; movable conductors electrically connected at end portions on one side to the movable contacts; and links rotatably coupled at end portions on one side to the end portions on the other side of the movable conductors and rotatably coupled at end portions on the other side to the end portions on the other side of the levers.

Abstract: A gas circuit breaker including: a cylindrical tank; a stator fixed inside the tank; and a mover disposed so as to face the stator. The mover is movable between a closing position and a cutoff position, the mover is in contact with the stator when located in the closing position, and the mover is out of contact with the stator when located in the cutoff position. The stator includes: a stator-side main contact fixed inside the tank; a stator-side resistance contact having a ring shape surrounding the stator-side main contact; and a spring and a dashpot supporting the stator-side resistance contact from a direction opposite to a direction in which the stator-side resistance contact faces the mover. The mover includes: a mover-side main contact disposed so as to face the stator-side main contact; and a mover-side resistance contact disposed in such a way as to face the stator-side resistance contact.

Abstract: A vacuum circuit breaker includes: a vacuum valve that is insulated and supported inside a grounded tank; a movable-side frame connecting a lower end of a movable-side external conductor to a movable conductor; a stationary-side frame connecting a lower end of a stationary-side external conductor to a stationary conductor; a movable-side insulating support tube that supports the movable-side frame and insulates thereof from the grounded tank; a stationary-side insulating support tube that supports the stationary-side frame and insulates thereof from the grounded tank; a movable-side flange covering a movable-side end of the grounded tank; and a rubber piece on an inner peripheral surface of the movable-side flange. The movable-side insulating support tube is supported, at an end opposite from an end connected to the movable-side frame, by the movable-side flange via the rubber piece and is movable along an axis and a radius of an arc-extinguishing chamber.

Abstract: A vacuum circuit breaker includes: an insulating rod disposed within a grounded tank; a drive conductor connected to the insulating rod; a first bushing and a second bushing connected to the side of the grounded tank; vacuum valves including movable contacts; levers rotatably coupled at end portions on one side to the insulating rod or the drive conductor; movable conductors electrically connected at end portions on one side to the movable contacts; and links rotatably coupled at end portions on one side to the end portions on the other side of the movable conductors and rotatably coupled at end portions on the other side to the end portions on the other side of the levers.

Abstract: A vacuum circuit breaker serving as a switch includes a pair of electrodes that serve as a stationary electrode and a movable electrode, a handler including a movable shaft and a housing that operate as a first mover in withdrawing the movable electrode from the stationary electrode and closing the movable electrode toward the stationary electrode, a movable shaft that is connected as a second mover to the movable electrode, a coil spring that is connected as an elastic between the first mover and the second mover to press the movable electrode against the stationary electrode, and a shock absorber that attenuates as an attenuator contraction of the elastic when the movable electrode is withdrawn from the stationary electrode.

Abstract: A vacuum circuit breaker includes: a vacuum valve that is insulated and supported inside a grounded tank; a movable-side frame connecting a lower end of a movable-side external conductor to a movable conductor; a stationary-side frame connecting a lower end of a stationary-side external conductor to a stationary conductor; a movable-side insulating support tube that supports the movable-side frame and insulates thereof from the grounded tank; a stationary-side insulating support tube that supports the stationary-side frame and insulates thereof from the grounded tank; a movable-side flange covering a movable-side end of the grounded tank; and a rubber piece on an inner peripheral surface of the movable-side flange. The movable-side insulating support tube is supported, at an end opposite from an end connected to the movable-side frame, by the movable-side flange via the rubber piece and is movable along an axis and a radius of an arc-extinguishing chamber.

Abstract: A gas circuit breaker includes: a fixed arc contact extending along an operating axis; a moving arc contact allowed to move to a position where the moving arc contact contacts the fixed arc contact and a position where the moving arc contact is separated from the fixed arc contact; a frame forming a puffer chamber around the moving arc contact; a nozzle having a cylindrical shape centered on the operating axis, the nozzle being fixed to the frame and projecting in a direction toward the fixed arc contact from the moving arc contact; and an arc extinction assisting portion provided on an inner surface of the nozzle and made of an ablation material. The nozzle and the arc extinction assisting portion are provided with a fall-off preventing portion to prevent the arc extinction assisting portion from falling off the nozzle.

Abstract: A gas circuit breaker includes: a fixed arc contact extending along an operating axis; a moving arc contact allowed to move to a position where the moving arc contact contacts the fixed arc contact and a position where the moving arc contact is separated from the fixed arc contact; a frame forming a puffer chamber around the moving arc contact; a nozzle having a cylindrical shape centered on the operating axis, the nozzle being fixed to the frame and projecting in a direction toward the fixed arc contact from the moving arc contact; and an arc extinction assisting portion provided on an inner surface of the nozzle and made of an ablation material. The nozzle and the arc extinction assisting portion are provided with a fall-off preventing portion to prevent the arc extinction assisting portion from falling off the nozzle.

Abstract: A gas circuit breaker that includes: a first tank filled with an insulating gas; a fixed contact provided inside the first tank; a movable contact provided inside the first tank; a nozzle that ejects the insulating gas toward the fixed contact when the movable contact moves in a first direction; a cylindrical body that guides the gas ejected from the nozzle in a second direction; and a second tank connected to the first tank in the second direction. The movable contact is movable between a position in contact with the fixed contact and a position separated from the fixed contact. The first direction is a direction in which the movable contact moves from the position in contact with the fixed contact to the position separated from the fixed contact. The second direction is a direction opposite to the first direction.

Abstract: A gas circuit breaker that includes: a first tank filled with an insulating gas; a fixed contact provided inside the first tank; a movable contact provided inside the first tank; a nozzle that ejects the insulating gas toward the fixed contact when the movable contact moves in a first direction; a cylindrical body that guides the gas ejected from the nozzle in a second direction; and a second tank connected to the first tank in the second direction. The movable contact is movable between a position in contact with the fixed contact and a position separated from the fixed contact. The first direction is a direction in which the movable contact moves from the position in contact with the fixed contact to the position separated from the fixed contact. The second direction is a direction opposite to the first direction.

Abstract: A gas circuit breaker includes a rod-shaped fixed arc contact, a cylindrical movable arc contact to contact or be separated from the fixed arc contact, a heat puffer chamber storing an arc-extinguishing gas to be blown to an arc generated between the fixed arc contact and the movable arc contact, and an insulator received within a receiving hole formed in a distal end part of the fixed arc contact. An end surface of the insulator on a side of the movable arc contact faces the side of the movable arc contact via an opening end of the housing hole, the end surface on the side of the movable arc contact is disposed closer to the inside of the housing hole than the opening end is, and the insulator is made of an ablation material that is vaporized by heat of the arc.

Abstract: An insulating support includes a pillar-shaped portion made of resin, a metal insert buried in one end surface of the pillar-shaped portion in an axial direction, a metal insert buried in the other end surface of the pillar-shaped portion in the axial direction, and one protrusion made of the resin and provided in a ring shape and integrally with the pillar-shaped portion on an outer circumferential surface of the pillar-shaped portion on a side of the metal insert. The metal insert includes a first cylindrical base portion and a first distal end portion. The metal insert includes a second cylindrical base portion and a second distal end portion. A whole of the first distal end portion is disposed within an extended range of the protrusion in the axial direction.

Abstract: The present invention relates to an insulating support for a power switchgear that insulates and supports the main body of a power switchgear provided in atmospheric air between a generator and a main transformer. The insulating support includes a core part that is molded only from a resin material and has a cylindrical shape; an exterior covering part that is molded only from a rubber material, is attached to an outer peripheral face of the core part, and includes a plurality of pleated parts; an end metal fitting that is attached to one end of the core part and is attached to the main body of the power switchgear; and an end metal fitting that is attached to the other end of the core part and is provided on the ground surface.

Abstract: A gas circuit breaker includes a rod-shaped fixed arc contact, a cylindrical movable arc contact to contact or be separated from the fixed arc contact, a heat puffer chamber storing an arc-extinguishing gas to be blown to an arc generated between the fixed arc contact and the movable arc contact, and an insulator received within a receiving hole formed in a distal end part of the fixed arc contact. An end surface of the insulator on a side of the movable arc contact faces the side of the movable arc contact via an opening end of the housing hole, the end surface on the side of the movable arc contact is disposed closer to the inside of the housing hole than the opening end is, and the insulator is made of an ablation material that is vaporized by heat of the arc.

Abstract: An adapter with an insertion guide for connection between a porcelain tube and a branch tube is provided at an upper end portion of the branch tube. The adapter with the insertion guide includes an insertion guide portion extending in an axial direction of the branch tube. After inserting a lower end of a central conductor into an insertion portion of an arc-extinguishing chamber, a flange of the porcelain tube is inserted into the adapter with the insertion guide by guidance of the insertion guide portion. Accordingly, in a state where a bushing and the branch tube are self-aligned with each other, a lower end portion of the central conductor is inserted into the insertion portion.

Abstract: An insulating support includes a pillar-shaped portion made of resin, a metal insert buried in one end surface of the pillar-shaped portion in an axial direction, a metal insert buried in the other end surface of the pillar-shaped portion in the axial direction, and one protrusion made of the resin and provided in a ring shape and integrally with the pillar-shaped portion on an outer circumferential surface of the pillar-shaped portion on a side of the metal insert. The metal insert includes a first cylindrical base portion and a first distal end portion. The metal insert includes a second cylindrical base portion and a second distal end portion. A whole of the first distal end portion is disposed within an extended range of the protrusion in the axial direction.

Abstract: An adapter with an insertion guide for connection between a porcelain tube and a branch tube is provided at an upper end portion of the branch tube. The adapter with the insertion guide includes an insertion guide portion extending in an axial direction of the branch tube. After inserting a lower end of a central conductor into an insertion portion of an arc-extinguishing chamber, a flange of the porcelain tube is inserted into the adapter with the insertion guide by guidance of the insertion guide portion. Accordingly, in a state where a bushing and the branch tube are self-aligned with each other, a lower end portion of the central conductor is inserted into the insertion portion.

Abstract: The present invention relates to an insulating support for a power switchgear that insulates and supports the main body of a power switchgear provided in atmospheric air between a generator and a main transformer. The insulating support includes a core part that is molded only from a resin material and has a cylindrical shape; an exterior covering part that is molded only from a rubber material, is attached to an outer peripheral face of the core part, and includes a plurality of pleated parts; an end metal fitting that is attached to one end of the core part and is attached to the main body of the power switchgear; and an end metal fitting that is attached to the other end of the core part and is provided on the ground surface.

Abstract: A piston rod includes a large-diameter portion that is formed on the side of a movable contact, and a small-diameter portion that is formed on the side of an insulating operation rod relative to the large-diameter portion, and that is formed with an outer diameter smaller than the inner diameter of an inner peripheral surface of an insulating cylindrical member. The insulating cylindrical member includes a cylindrical portion that is interposed between the outer peripheral surface of the small-diameter portion and the inner peripheral surface of the insulating operation rod, a bottom portion that is arranged opposed to the distal end of the small-diameter portion, and a through hole through which a coupling pin is inserted through the piston rod and the insulating operation rod.