JP2015082368A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas circuit breaker capable of preventing vibrations at open/close operation.SOLUTION: A gas circuit breaker 1 includes: a movable contactor 20; and an opposite contactor 10 disposed in a closed vessel being opposed to each other, which are brought into contact with each other or separated from each other when turning ON or OFF the power and generates an arc discharge in the process of turning ON or OFF. The movable contactor 20 is inserted into a slide support cylinder 7 fixed in the closed vessel. The slide support cylinder 7 includes, on the inner periphery thereof, a sliding part 71 that slidably supports the movable contactor 20 so as to move therein. The sliding part 71 is provided with a conductor ring 74 and a sliding ring 73 each of which comes into contact with the movable contactor 20.

Description

  Embodiments of the present invention relate to a gas circuit breaker with a closing resistance contact that switches between current interruption and closing in a power system.

  In an electric power system, a gas circuit breaker is used when it is necessary to interrupt an excessive accident current, a small advance current, a delayed load current such as a reactor cutoff, or an extremely small accident current. The gas circuit breaker mechanically disconnects the contactor during the disconnection process, and extinguishes the arc discharge generated during the disconnection process by blowing arc-extinguishing gas.

  As this gas circuit breaker, a type called a puffer type is now widely used. The puffer type gas circuit breaker has a pressure accumulating chamber in an airtight container filled with an arc extinguishing gas. The pressure accumulating chamber is reduced in volume with the separation of the contact, and accumulates arc extinguishing gas inside. And the accumulator chamber blows off the fully extinguished arc extinguishing gas to the arc discharge, the arc discharge recovers the insulation performance of the arc part, extinguishes at the current zero point where the arc discharge becomes small, and interrupts the current To complete.

  Such a gas circuit breaker is required to have an increased required breaking capacity and high reliability as the capacity of the power transmission system increases. Therefore, for example, in a high voltage gas circuit breaker such as a 550 kV class, a closing resistance method is adopted in order to suppress a high surge voltage at the time of closing. In this closing resistance method, a closing resistance contact portion having a closing resistance is provided in parallel with the main contact portion of the gas circuit breaker, and the surge voltage at the time of closing is suppressed by this closing resistance. This is a method of throwing parts.

  In this gas circuit breaker, in the current application process, the input resistance contact portion is first connected to the power system, the energy generated by the surge voltage is absorbed, and then the main contact portion is connected. By this series of operations, application of overvoltage to the main contact portion is suppressed.

  This gas circuit breaker with a contact resistance contact may cause a serious problem such as a power failure in the transmission and transformation system due to a failure or the like, and higher reliability is required. In recent years, demands for downsizing and cost reduction of power equipment are increasing due to the background of the liberalization of power. Therefore, even a gas circuit breaker with a closing resistance contact is required to function with a small and simple configuration.

In other words, the closing resistance contact portion requires the following performance.
(1) In order to maintain high reliability in mechanical strength, vibration during opening and closing operations is suppressed to be small,
The structure does not generate excessive impact force.
(2) In order to maintain electrical performance, it has good sliding performance and energization performance with respect to repeated opening and closing operations.
(3) In order to reduce the size of the puffer type gas circuit breaker with closing resistance contact, the structure of the closing resistance contact is simple and small.

  In order to obtain these performances, various proposals have been made for gas circuit breakers with input resistance contacts. As an example, there has been proposed a gas circuit breaker including a damper in the operation direction of the electrode included in the making resistance contact portion. By reducing the moment of force with the damper, the impact force during the opening / closing operation can be reduced and the shut-off performance can be stabilized.

JP-A-4-282522

  In general, a gas circuit breaker is required to have a long life and reliability when used in a transmission and substation system. However, in a conventional gas circuit breaker with a closing resistance contact, even when a damper is provided, excessive wear and deformation occur in the sliding part and the current-carrying part during long-term use that requires repeated opening and closing operations. There was a fear.

  The cause of this excessive wear and deformation is an irregular phenomenon such as the entry of foreign matter into the sliding portion, vibration during opening and closing operations, and the like. This vibration during the opening / closing operation is a complex phenomenon that is affected by the material deterioration and usage conditions of the sliding part over time. To achieve a fundamental solution, the vibration of the sliding part and the current-carrying part is suppressed. There is a need.

  The present invention has been proposed to solve the above-described problems of the prior art, and an object of the present invention is to provide a gas circuit breaker that suppresses vibration during opening and closing operations.

  In order to achieve the above object, a gas circuit breaker for switching between current interruption and injection is disposed in a closed container filled with an arc-extinguishing gas and opposed to the inside of the closed container, and is in contact with each other at the time of injection or interruption. A movable contact portion and an opposed contact portion that are separated from each other and arc discharge is generated in the separation process; a sliding support cylinder that is fixed in the sealed container and through which the movable contact portion is inserted; and the slide A sliding portion provided on an inner periphery of the movable support cylinder and slidably supporting movement of the movable contact portion; an energization ring provided on the sliding portion and contacting the movable contact portion; A sliding ring provided on the sliding portion and in contact with the movable contact portion.

It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on this embodiment. It is an enlarged view of the sliding part of the sliding support cylinder which the gas circuit breaker concerning this embodiment has.

(Outline configuration)
Hereinafter, the gas circuit breaker according to the present embodiment will be described with reference to FIGS. 1 and 2. A gas circuit breaker 1 shown in FIG. 1 is configured by housing a main contact portion 2 and a closing resistance contact portion 3 in a sealed container (not shown) filled with an arc extinguishing gas. The main contact portion 2 and the closing resistor contact portion 3 are electrically connected in parallel. The main contact portion 2 and the closing resistance contact portion 3 are mechanically connected by a link mechanism 4 and operate synchronously.

  The main contact portion 2 includes an opposing contact portion 10 and a movable contact portion 20 that are opposed to each other in the sealed container. The gas circuit breaker 1 brings the opposing contact portion 10 and the movable contact portion 20 into contact with and away from each other for turning on and off the current. The making resistance contact portion 3 includes an opposing making resistance contact portion 30 and a movable making resistance contact portion 40 which are opposed to each other in the sealed container. The gas circuit breaker 1 suppresses the surge voltage applied to the main contact portion 2 by conducting the closing resistance contact portion 3 prior to the main contact portion 2 when turned on.

  Further, the gas circuit breaker 1 extinguishes the arc discharge generated in the current interruption process by blowing arc extinguishing gas. This gas circuit breaker 1 is a so-called puffer type, has a mechanical puffer chamber 23 composed of a cylinder 231 and a piston 232, and an insulating nozzle 24, and the mechanical puffer chamber 23 is moved by relative approach between the cylinder 231 and the piston 232. The arc extinguishing gas accumulated by the mechanical compression action is guided to arc discharge by the insulating nozzle 24 and blown strongly.

(Main contact)
In such a gas circuit breaker 1, the hermetic container is made of a material used for an insulator such as metal, porcelain or glass, and is grounded. The arc-extinguishing gas filled in the sealed container is, for example, sulfur hexafluoride gas (SF ₆ gas), air, carbon dioxide, oxygen, nitrogen, or a mixed gas thereof, and other arc extinguishing performance and insulation performance. Excellent gas. Desirably, the arc-extinguishing gas is a single gas or a mixed gas of a gas that has a lower global warming potential than sulfur hexafluoride gas, has a low molecular weight, and is in a gas phase at least 1 atm and 20 degrees centigrade. is there.

  The opposing contact portion 10 and the movable contact portion 20 are a composite body having a basic shape of an internal hollow cylinder or a solid column. The constituent members of the opposed contact portion 10 and the movable contact portion 20 have a concentric arrangement having a common center axis, and the related members function cooperatively by matching the diameters. . Hereinafter, the side of the opposed contact portion 10 and the movable contact portion 20 facing the other is referred to as the front end or the front, and the opposite side is referred to as the rear end or the rear.

  The opposing contact portion 10 is a fixed element having an opposing arc contact 11 and an opposing energizing contact 12 on a conductor plate 13 fixed in a sealed container. The conductor plate 13 has a plane orthogonal to the central axis and is fixed in the sealed container. The counter arc contact 11 and the counter energizing contact 12 are fixed to the plane of the conductor plate 13.

  The opposed energizing contact 12 is a cylindrical conductor. The opposite energizing contact 12 has one end face fixed to the surface of the conductor plate 13 on the movable contact portion 20 side, and extends to the movable contact portion 20 side. The opening edge of the tip of the opposed energizing contact 12 bulges inside. The counter arc contact 11 is a cylindrical conductor whose one end is rounded. The counter arc contact 11 has one end surface fixed to the surface of the conductor plate 13 on the movable contact portion 20 side, and extends on the central axis toward the movable contact portion 20 side.

  The movable contact portion 20 is a movable element having a movable arc contact 21, a movable energizing contact 22, a mechanical puffer chamber 23, and an insulating nozzle 24. The movable contact portion 20 is configured with an operation rod 25 extending on the central axis as a core. That is, in the movable contact portion 20, the cylinder 231 constituting the mechanical puffer chamber 23 has a cup shape with one end, the bottom portion is fixed to the tip of the operation rod 25, and the peripheral surface portion extends rearward. . The piston 232, which is another component of the mechanical puffer chamber 23, has a disk shape having a plane orthogonal to the central axis, is inserted by the operation rod 25, and is fitted inside the cylinder 231.

  The movable arc contact 21, the movable energized contact 22, and the insulating nozzle 24 are erected on the bottomed portion of the cylinder 231 and extend toward the opposed contact portion 10. The movable arc contact 21 has the same diameter as the operation rod 25, extends from the front end surface of the operation rod 25, and has an opening facing the counter arc contact 11. The movable arc contactor 21 is a conductor having an internal hollow cylindrical shape with an opening on the front side. The inner diameter of the movable arc contact 21 coincides with the outer diameter of the opposed arc contact 11.

  In addition, the front-end | tip of the movable arc contactor 21 may be formed as a finger-like electrode by dividing | segmenting in the circumferential direction. The movable arc contact 21 has flexibility, and the inner diameter of the opening edge of the movable arc contact 21 is slightly smaller than the outer diameter of the counter arc contact 11.

  The movable energizing contact 22 is a ring-shaped conductor that has a larger diameter than the movable arc contact 21 and matches the inner diameter of the opposing energizing contact 12. The movable energizing contact 22 surrounds the movable arc contact 21 and is disposed on the bottomed portion of the cylinder 231 so that the opposing energizing contact 12 and the edge surface face each other.

  The insulating nozzle 24 is an internal hollow cylinder, is fixed to the front end face of the mechanical puffer chamber 23, and extends from between the movable arc contact 21 and the movable energizing contact 22 toward the opposing contact portion 10 side. .

  The movable contact portion 20 is supported by a double cylinder fixed in the sealed container so as to be movable in the thrust direction. The insulating cylinder 5 extends along the central axis in the sealed container, and the double cylinder stands on the front end face of the insulating cylinder 5 toward the opposed contact portion 10 side. The double cylinder is a base 6 on the inner shell side and a sliding support cylinder 7 on the outer shell side. There is a space between the base 6 and the sliding support cylinder 7. The movable contact portion 20 is fitted and supported from the front side in the space inside the base 6 and between the base 6 and the sliding support cylinder 7.

  Specifically, the base 6 has an opening having the same diameter as that of the operation rod 25 on the front end surface. The operating rod 25 is inserted into the base 6 and slides along the opening edge of the base 6 in the thrust direction. The cylinder 231 is supported by inserting a peripheral surface portion into a space between the base 6 and the sliding support cylinder 7. A sliding portion 71 is provided on the circular edge of the sliding support cylinder 7. The sliding portion 71 is in contact with the outer peripheral surface of the cylinder 231 and guides the moving direction of the cylinder 231.

  As shown in FIG. 2, the sliding portion 71 has a circular edge on the front side that bulges inward. A plurality of accommodation holes are provided on the inner peripheral surface of the sliding portion 71, one of the accommodation holes serves as a grease reservoir 72, and either the sliding ring 73 or the energization ring 74 is accommodated in the other accommodation hole. ing. The accommodation holes are arranged along the central axis. For example, the grease reservoir 72, the sliding ring 73, the energizing ring 74, and the sliding ring 73 are arranged in order from the front to the rear.

  The sliding ring 73 is desirably formed of a resin having a good PTFE sliding performance, but is not limited to this and may have any sliding performance. The energization ring 74 can be applied in the form of a ring having a wing-shaped protrusion, a ring-shaped coil spring, or the like, in addition to a copper-based metal ring having good energization performance, and is not limited to these, and the energization performance is good. Anything is acceptable.

(Release contact point)
Returning to FIG. 1, in the making resistance contact portion 3, the opposing making resistance contact portion 30 is a fixed element having a making resistor 31. The movable closing resistance contact portion 40 is a movable element that is connected to the operation rod 25 via the link mechanism 4 and is synchronized with the push-pull of the operation rod 25. Each of the constituent members of the opposing making resistance contact portion 30 and the movable making resistance contact portion 40 has a common central axis parallel to the central axis of the main contact portion 2.

  The opposing throwing resistance contact portion 30 is supported by the insulating spacer 32 provided on the opposing energizing contact portion 12 via the insulating spacer 32. The insulating spacer 32 is attached to the peripheral surface of the conductor plate 13. This opposing throwing resistance contact portion 30 is configured by placing a throwing resistor 31 and an opposing electrical shield 33 electrically in series.

  The input resistor 31 is a resistor that absorbs a surge voltage. The input resistor 31 is electrically connected to the conductor plate 13. The opposite-side electric shield 33 has a cylindrical shape with an opening at the front, and a circular edge is rounded into a curved surface so as to exhibit an electric shielding function.

  The opposing electrical shield 33 is provided with a return spring 34 with the inner bottom portion as a seating surface, and an opposing closing resistance contact 35 is connected to the free end of the return spring 34. The return spring 34 is urged toward the movable closing resistance contact 40 and functions as a shock absorber for the opposing closing resistance contact 35. The opposing input resistance contact 35 is a cylindrical conductor, and is slidably incorporated in the opposing electrical shield 33. The opposing electric shield 33 is provided with a through hole 33a that penetrates the inside and the outside.

  The movable input resistance contact portion 40 includes a movable electric shield 41 extending from the side surface of the base 6 as a casing, and a movable input resistance contact 42 is slidably incorporated in the movable electric shield 41. Yes. The movable making resistance contact 42 is a rod-shaped conductor extending toward the opposing making resistance contact 35.

(Link mechanism)
The link mechanism 4 has various links including a lever, a rod, and an intermediate link. The link mechanism 4 is connected to the movable contact portion 20 and the movable closing resistance contact portion 40 so that the driving force of a driving device (not shown) 20 and the movable input resistance contact 40. Then, the movable contact portion 20 and the movable closing resistance contact 40 are pulled in synchronously or pushed out toward the opposing contact portion 10 and the opposing closing resistance contact portion 30.

  That is, in the movable contact portion 20, the operation rod 25 is connected via the insulating rod 51, the first lever 52, and the intermediate link 53. The insulating rod 51 is a link that extends from the driving device and moves in the thrust direction along the central axis.

  Specifically, the rear end of the operation rod 25 is pin-coupled to one end of the intermediate link 53. The other end of the intermediate link 53 is pin-coupled to the free end of the first lever 52. The fixed end of the first lever 52 is a fulcrum that is pivotally supported in a sealed container. The first lever 52 is a third type lever as viewed from the intermediate link 53. The first lever 52 has an applied force point between a pin coupling portion with the intermediate link 53 and a fulcrum portion, and one end of the insulating rod 51 is pin-coupled to this applied force point.

  The movable making resistance contact 42 is connected to an operation rod 54 extending on the central axis of the movable making resistance contact 42 by pin coupling. The operation rod 54 is a rigid rod having insulating performance, and the front end is pin-coupled to the rear end of the movable input resistance contact 42. The rear end of the operation rod 54 is pin-coupled to the free end of the second lever 55.

  The second lever 55 is connected to the first lever 52 via the intermediate link 56. As viewed from the intermediate link 56, the first lever 52 is a second type lever, and the second lever 55 is a third type lever. That is, the first lever 52 sets an action point between a pin coupling portion with the insulating rod 51 and a fulcrum portion, and one end of the intermediate link 56 is pin-coupled to this action point.

  The second lever 55 extends from the movable contact portion 20 toward the movable closing resistance contact portion 40 so as to become a free end from the fixed end, and between the free end to which the operation rod 54 is pin-coupled and the fulcrum. An application force point is set on the other end, and the other end of the intermediate link 56 is pin-connected to the application force point.

(Function)
In the charging operation, the driving device operates to push the insulating rod 51 forward along the thrust direction. Then, the first lever 52 rotates around the fixed end so that the free end swings forward. At this time, on the closing resistance contact portion 3 side, as the first lever 52 rotates to swing the free end forward, the intermediate link 56 is pushed forward and is pin-coupled to the intermediate link 56. The second lever 55 rotates to swing the free end forward.

  By the rotation of the second lever 55, the operation rod 54 pin-coupled to the free end of the second lever 55 is pushed forward, and the movable closing resistance contact 42 pin-coupled to the operation rod 54 at the rear end is also electrically connected. While being guided by the shield, it is pushed out toward the opposing throwing resistance contact 35. As the closing operation proceeds, the movable closing resistance contact 42 is further pushed forward to come into contact with the opposing closing resistance contact 35. As a result, the circuit having the making resistor 31 is closed, and the energy for generating the surge voltage is absorbed by the making resistor 31.

  On the other hand, on the main contact portion 2 side, the intermediate link 53 that is pin-coupled to the free end of the first lever 52 moves forward. As the intermediate link 53 moves forward, the operating rod 25 moves toward the opposing contact portion 10 in the thrust direction. The movable contact portion 20 having the operation rod 25 as a core moves to the counter contact portion 10 side in synchronization with the movement of the operation rod 25. When the closing operation further proceeds after connection of the closing resistance contact portion 3, the movable energizing contact 22 is connected to the opposing energizing contact 12, and the movable arc contact 21 is connected to the opposing arc contact 11 to be in an energized state. It reaches.

  In the energized state, the conduction plate 13, the opposed energizing contact 12, the movable energizing contact 22, and the cylinder 231 are electrically connected to form an electric circuit. Although not particularly illustrated, two conductors are fixed to the opposed contact portion 10 side and the movable contact portion 20 side by spacers in the sealed container. The spacer insulates the sealed container from the conductor and supports the conductor. In the energized state, the current flows into the gas circuit breaker 1 through a bushing (not shown), and from the conductor on the opposed contact portion 10 side through the conductor and the conductor on the movable contact portion 20 side and the bushing (not shown). And flows out of the gas circuit breaker 1.

  In this charging operation, the cylinder 231 provided in the movable contact portion 20 moves while sliding the sliding portion 71 of the sliding support cylinder 7 via the sliding ring 73. Therefore, the vibration room accompanying the movement of the movable contact portion 20 is greatly suppressed. Further, by suppressing the vibration, the cylinder 231 and the energization ring 74 continue to contact stably, and the energization performance is stably maintained. In addition, since the grease reservoir 72 is provided in the sliding portion 71, grease is applied in the length direction of the cylinder 231 due to the movement of the cylinder 231, and even if the opening / closing operation of the gas circuit breaker 1 is repeated, the lubrication effect is applied. Stable sliding performance and energization performance are maintained.

  Here, since the arrangement direction of the sliding ring 73, the energization ring 74, and the grease reservoir 72 coincides with the opening / closing operation direction of the main contact portion 2, the movement trajectory of the sliding ring 73 and the energization ring 74 that are likely to be worn. It is possible to effectively generate a lubricating action, and the vibration suppressing effect is also dramatically increased.

(effect)
As described above, in the gas circuit breaker 1 according to the present embodiment, the sliding support cylinder 7 through which the movable contact portion 20 is inserted is fixed in the sealed container so that the movement of the movable contact portion 20 can be slid. The sliding portion 71 to be supported is provided on the inner periphery of the sliding support cylinder 7, and the energization ring 74 and the sliding ring 73 are provided on the sliding portion 71 so as to contact the movable contact portion 20.

  As a result, the movement of the movable contact portion 20 is guided by the sliding portion 71 to reduce the room for vibration, and the vibration of the gas circuit breaker 1 when the current is interrupted and turned on is greatly suppressed. Therefore, excessive wear and deformation factors are reduced, and high reliability in mechanical strength can be maintained.

  The energizing ring 74 and the sliding ring 73 are provided in a straight line along the moving direction of the movable contact portion 20, and the sliding portion 71 has a grease reservoir 72 in the energizing ring 74 and the sliding ring 73. On the other hand, they were arranged in a straight line. As a result, the lubrication effect due to grease acts on areas where wear and deformation are likely to occur, and excessive wear and deformation are further reduced. It is possible to maintain the energization performance.

  Further, the gas circuit breaker 1 is provided with a closing resistance contact portion 3 electrically connected in parallel with the main contact portion 2. The making resistance contact portion 3 contacts or separates from each other at the time of making or shutting off, and the movable making resistance contact portion 40 and the opposing making resistance contact that come into contact with each other prior to the contact of the movable contact portion 20 and the facing contact portion 10. Part 30. A link mechanism 4 is provided which is pin-coupled to both the movable input resistance contact portion 40 and the movable contact portion 20 and transmits a moving force to both.

  For example, the link mechanism 4 is interposed between an insulating rod 51 extending from a driving device that generates a moving force, a first lever 52 having the insulating rod 51 as an application point, and the first lever 52 and the movable contact portion 20. One or a plurality of links such as the intermediate link 53, and one or a plurality of links such as the intermediate link 56 and the second lever 55 interposed between the first lever 52 and the movable closing resistance contact portion 40. I made it.

  In this way, the movable input resistance contact portion 40 and the movable contact portion 20 are not fixed, but the vibration is directly transmitted to the other even if vibration is generated on one side through the link mechanism 4. Therefore, the cause of wear and deformation can be reduced, and high reliability in mechanical strength can be maintained. In addition, the puffer-type gas circuit breaker 1 having a small and simple configuration and a highly reliable input resistance contact can be provided.

(Other embodiments)
In the present specification, an embodiment according to the present invention has been described. However, this embodiment is presented as an example, and is not intended to limit the scope of the invention. Combinations of all or any of the configurations disclosed in the embodiments are also included. The above embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

  For example, the gas circuit breaker 1 may employ a heat puffer chamber instead of the mechanical puffer chamber 23, or may employ a series puffer type in which the mechanical puffer chamber 23 and the heat puffer chamber are used in combination. The thermal puffer chamber is a gas flow generating means for accumulating the arc-extinguishing gas in the room by using the thermal energy of the arc-extinguishing gas that has been heated by arc discharge.

  Moreover, in this embodiment, although comprised with the two sliding rings 73 and the one electricity supply ring 74, it is not limited to this. For example, each combination may be composed of three or more slide rings 73 and two or more energization rings 74.

  Furthermore, it is also possible to configure the gas circuit breaker 1 having no closing resistance contact portion 3 with the same configuration as that of the present embodiment. Even with such a configuration, if the sliding portion 71 of the sliding support cylinder 7 is provided, stable sliding performance and energization performance can be maintained even if the opening / closing operation is repeated.

DESCRIPTION OF SYMBOLS 1 Gas circuit breaker 2 Main contact part 3 Input resistance contact part 4 Link mechanism 5 Insulating cylinder 6 Base 7 Sliding support cylinder 71 Sliding part 72 Grease pool 73 Sliding ring 74 Current carrying ring 10 Opposing contact part 11 Opposing arc contact DESCRIPTION OF SYMBOLS 12 Opposite energizing contact 13 Conductor plate 20 Movable contact part 21 Movable arc contact 22 Movable energizing contact 23 Mechanical puffer chamber 231 Cylinder 232 Piston 24 Insulation nozzle 25 Operation rod 30 Opposing throwing resistance contact part 31 Throwing resistance body 32 Insulation Spacer 33 Opposing side electric shield 33a Through hole 34 Return spring 35 Opposing closing resistance contact 40 Movable closing resistance contact portion 41 Moving side electric shield 42 Movable closing resistance contact 51 Insulating rod 52 First lever 53 Intermediate link 54 Operation rod 55 Second lever 56 Intermediate link

Claims (5)

A gas circuit breaker that switches between current interruption and input,
A sealed container filled with arc-extinguishing gas;
A movable contact portion and an opposing contact portion, which are disposed opposite to each other in the closed container, contact or separate from each other at the time of charging or shutting off, and arc discharge is generated in the process of separation;
A sliding support cylinder fixed in the sealed container and through which the movable contact portion is inserted;
A sliding portion that is provided on an inner periphery of the sliding support cylinder and supports the movement of the movable contact portion in a slidable manner;
An energization ring that is provided on the sliding portion and contacts the movable contact portion;
A sliding ring provided on the sliding portion and abutting against the movable contact portion;
Providing
A gas circuit breaker characterized by The energization ring and the sliding ring are provided in a straight line along the moving direction of the movable contact portion,
The sliding portion has a grease reservoir that is aligned with the energization ring and the sliding ring and contacts the movable contact portion,
The gas circuit breaker according to claim 1. The energization ring is a ring having a wing-shaped protrusion or a ring-shaped coil spring;
The gas circuit breaker according to claim 1 or 2. The movable contact portion and the opposed contact portion are electrically connected in parallel, and are brought into contact or separated from each other when being turned on or off, and contacted prior to the contact of the movable contact portion and the opposed contact portion. A movable closing resistance contact portion and an opposing closing resistance contact portion;
A link mechanism that is pin-coupled to both the movable input resistance contact portion and the movable contact portion, and transmits a moving force to both.
Further comprising,
The gas circuit breaker according to any one of claims 1 to 3. The link mechanism is
An insulating rod extending from the driving device for generating the moving force;
A lever having the insulating rod as an application point;
One or a plurality of links interposed between the lever and the movable contact portion;
One or a plurality of links interposed between the lever and the movable input resistance contact portion;
Providing
The gas circuit breaker according to claim 4.

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