Abstract: An opening/closing device of an embodiment has first to third movable contacts, first to third transmission mechanisms, first to third containers, a crankshaft, an operating mechanism, and a shock absorbing mechanism. The first to third movable contacts are accommodated in the first to third containers. The first to third transmission mechanisms are connected to the first to third movable contacts. The first to third containers accommodate at least the first movable contact. The crankshaft operates the first to third transmission mechanisms and changes the first to third movable contacts from a closed state to an open state. The operating mechanism is disposed on the side of the first transmission mechanism to rotate the crankshaft. The shock absorbing mechanism is disposed on the side of the third transmission mechanism to absorb a shock of rotational movement of the crankshaft.

Abstract: There are provided a row of external permanent magnets and a row of internal permanent magnets; a floating output ring is provided on which is wound a 3-phase coil, between these rows. The floating output ring has no mechanical restraining relationship with any other member in the linear motor). Instead, a controller that controls a PWM inverter that injects AC exciting current into the 3-phase coil brings the central axes of the double cylinder and the floating output ring into coincidence by generating supporting force with respect to the floating output ring by magnetism, by controlling the d axis current component of the exciting current.

Abstract: A switch capable of easily accomplishing current cutoff roles required for a high-voltage switch, and which has a short breaking time. The switch includes pressure housings filled with an insulative medium, a plurality of contactors each including a contact, a plurality of operation units actuating the contacts, an insulative spacer dividing the interiors of the pressure housings into the same number of internal spaces as the number of contacts, and an electrode passing completely through the insulative spacer and fastened to the insulative spacer. The contactor is provided one by one for each internal space, and all contacts are electrically connected in series via the electrode, and the operation units actuate the corresponding contacts, respectively.

Abstract: A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.

Abstract: An electromagnetic rebound mechanism unit and a magnetic latch unit are fixedly installed between a switchgear and a spring drive unit by virtue of a rebound fixing member and a fixing yoke. The electromagnetic rebound mechanism unit includes a rebound coil fixedly secured to the rebound fixing member, a reinforcing plate fixedly secured to a movable shaft and a rebound ring fixedly secured to the reinforcing plate. The magnetic latch unit includes a permanent magnet fixedly secured to the rebound fixing member, a latch ring fixedly secured to the permanent magnet and a movable yoke fixedly secured to the movable shaft. The spring drive unit includes a support frame, a spring retaining plate, a circuit-opening spring, a damper unit, and first and second electromagnetic solenoids.

Abstract: A switch capable of easily accomplishing current cutoff roles required for a high-voltage switch, and which has a short breaking time. The switch includes pressure housings filled with an insulative medium, a plurality of contactors each including a contact, a plurality of operation units actuating the contacts, an insulative spacer dividing the interiors of the pressure housings into the same number of internal spaces as the number of contacts, and an electrode passing completely through the insulative spacer and fastened to the insulative spacer. The contactor is provided one by one for each internal space, and all contacts are electrically connected in series via the electrode, and the operation units actuate the corresponding contacts, respectively.

Abstract: A current-limiting reactor that is capable of decreasing an increase rate of a fault current without increasing a handling energy by a surge absorber of a DC breaker provided in a DC system. A current-limiting reactor apparatus includes a reactor connected in series with a DC breaker, a surge absorber connected in parallel with the reactor, and a switch connected in series with the surge absorber. The switch is loaded before the DC breaker cuts off a current and after a fault occurs in a power system.

Abstract: A switchgear operating mechanism has: a ratchet wheel that rotates together with a closing shaft; a stop lever that enables contact between an energy storing cam and a roller; a motor that transmits power to a feed lever; a feed pawl; stop pawls that suppresses reverse rotation of the feed pawl; a closing lever that expands/contracts a closing spring; a catch mechanism for energy storage for the closing lever; a closing cam; a stopper unit that suppresses rotation of the stop lever; a first sprocket; second and third sprockets that are capable of rotating together with an intermediate shaft; a fourth sprocket rotatably fastened to an energy storing cam shaft; a first chain that engages with the first and second sprockets; and a second chain that engages with the third and fourth sprockets.

Abstract: An electromagnetic rebound mechanism unit and a magnetic latch unit are fixedly installed between a switchgear and a spring drive unit by virtue of a rebound fixing member and a fixing yoke. The electromagnetic rebound mechanism unit includes a rebound coil fixedly secured to the rebound fixing member, a reinforcing plate fixedly secured to a movable shaft and a rebound ring fixedly secured to the reinforcing plate. The magnetic latch unit includes a permanent magnet fixedly secured to the rebound fixing member, a latch ring fixedly secured to the permanent magnet and a movable yoke fixedly secured to the movable shaft. The spring drive unit includes a support frame, a spring retaining plate, a circuit-opening spring, a damper unit, and first and second electromagnetic solenoids.

Abstract: A switch includes: a hermetic vessel filled with an insulating medium; an insulating spacer dividing the hermetic vessel into a first heretic space and second heretic space; an electrode fixedly penetrating through the insulating spacer; and a first circuit breaker part inserted between a first conductor and the electrode in the first hermetic space and serially connecting a second conductor in the second heretic space in a closed state, and having a first contact including the electrode and a first driver driving the first contact. The first circuit breaker part is a vacuum circuit breaker having the first contact housed in a vacuum vessel and a second circuit breaker part having the second contact larger in dielectric strength than in the vacuum circuit breaker. In an interrupting operation from the closed state, the first contact and the second contact are opened, and the first contact is closed when or after the second contact is opened.

Abstract: A switch includes: a second conductor; a second movable electrode provided in a second hermetic space so as to be movable in a first direction in which it parts from the fixed electrode and in a second direction opposite the first direction; an opposed electrode slidably provided in the fixed electrode to face the second movable electrode so as to open from and be in contact with the second movable electrode in an open state and a closed state respectively; a second driver which generates a driving force and moves the second movable electrode in the first direction when performing an opening operation; and a driving force transmitting mechanism which moves the opposed electrode in the second direction by converting a direction of the driving force for moving the second direction opposite the moving direction of the second movable electrode when the second driver generates the driving force for moving the second movable electrode in the first direction.

Abstract: A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.

Abstract: A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.

Abstract: A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.

Abstract: There are provided a row of external permanent magnets and a row of internal permanent magnets; a floating output ring is provided on which is wound a 3-phase coil, between these rows. The floating output ring has no mechanical restraining relationship with any other member in the linear motor). Instead, a controller that controls a PWM inverter that injects AC exciting current into the 3-phase coil brings the central axes of the double cylinder and the floating output ring into coincidence by generating supporting force with respect to the floating output ring by magnetism, by controlling the d axis current component of the exciting current.

Abstract: Provided is a switchgear which is capable of easily accomplishing an interruption task required in a high-voltage-purpose switchgear and which is short in the interruption time. The switchgear includes a pressure container 1 and 2 filled with an insulating medium, a plurality of contact point units 7 and 9, an insulation spacer 3 configured to divide the inside of the pressure containers 1 and 2 into the same number of internal spaces 101 and 102 as the number of the contact point units, and a spacer electrode 6 extending through the insulation spacer 3 and fixed to the insulation spacer 3. The contact point units 7 and 9 include contact points and an operating unit 29 for operating the contact points. The contact point units 7 and 9 are installed in the internal spaces 101 and 102, one in each space.

Abstract: The circuit opening operation section of an embodiment of switchgear operation mechanism comprises: a circuit opening electromagnetic solenoid having a fitting structure that is provided with a step; and a solenoid spacer for adjusting the distance between a circuit opening trigger mechanism and the circuit opening electromagnetic solenoid. The circuit opening solenoid has: a solenoid housing fixed in position by way of the solenoid spacer; a plunger; and a stopper fitted to the solenoid housing so as to limit the sliding motion of the plunger in the plunger returning direction when the coil is not supplied with electric power. The limiting position of the stopper is adjustable.

Abstract: A switch includes: a hermetic vessel filled with an insulating medium; an insulating spacer dividing the hermetic vessel into a first heretic space and second heretic space; an electrode fixedly penetrating through the insulating spacer; and a first circuit breaker part inserted between a first conductor and the electrode in the first hermetic space and serially connecting a second conductor in the second heretic space in a closed state, and having a first contact including the electrode and a first driver driving the first contact. The first circuit breaker part is a vacuum circuit breaker having the first contact housed in a vacuum vessel and a second circuit breaker part having the second contact larger in dielectric strength than in the vacuum circuit breaker. In an interrupting operation from the closed state, the first contact and the second contact are opened, and the first contact is closed when or after the second contact is opened.

Abstract: A switch includes: a second conductor; a second movable electrode provided in a second hermetic space so as to be movable in a first direction in which it parts from the fixed electrode and in a second direction opposite the first direction; an opposed electrode slidably provided in the fixed electrode to face the second movable electrode so as to open from and be in contact with the second movable electrode in an open state and a closed state respectively; a second driver which generates a driving force and moves the second movable electrode in the first direction when performing an opening operation; and a driving force transmitting mechanism which moves the opposed electrode in the second direction by converting a direction of the driving force for moving the second direction opposite the moving direction of the second movable electrode when the second driver generates the driving force for moving the second movable electrode in the first direction.

Abstract: A gas circuit breaker includes movable and fixed electrode parts arranged to face each other in an engaging/separating manner in a container filled with an insulating gas, an operating mechanism attached to a partition of the container and configured to output an operating force to the movable electrode part, an operating rod attached to the movable electrode part, a first link rotatably attached to the operating rod, a lever rotatably attached to the first link, a support bearing fixed to the partition of the container via an insulating spacer, a second link rotatably attached to the lever and also rotatably attached to the support bearing, a seal bearing connected through the partition of the container, a seal rod rotatably attached to the center of the lever and slidably supported to the seal bearing, and a third link rotatably attached to the seal rod and also attached to the operating mechanism.