JPH11162303A - Switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch gear reduced in size and production cost, and generating no explosion in an occurrence of an arc short circuit accident therein. SOLUTION: A fixed electrode 3 for a main circuit is provided at one end of the inside of one vacuum ground vessel 1 while a fixed electrode 5 for a ground circuit is provided at the other end thereof, wherein the number of each electrode 3 on 5 corresponds to the style of single phase on multi-phase. A moving conductor 7 which is connected to a load side conductor 6 for each phase is insulation-supported between the fixed electrodes 3, 5 so that it can move linearly. A movable electrode 8 for the main circuit is provided at one end of the moving conductor 7 while movable electrode 9 for the ground circuit is provided at the other end thereof. A driver for moving the moving conductor 7 is provided at the outer side of the vacuum ground vessel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes an electrode for a main circuit for contacting / separating a bus-side conductor and a load-side conductor, and an electrode for a ground circuit for contacting / separating a load-side conductor and a ground-side conductor. Switchgear.

[0002]

2. Description of the Related Art A switchgear used for distributing power received from a bus to various load devices and other electric rooms includes a bus-side conductor for connection to the bus, and a connection between a power transmission cable and a load. Circuit switch for connecting / disconnecting the bus-side conductor and load-side conductor together with connection conductors such as the load-side conductor for grounding, grounding switch for grounding the load-side conductor, and control equipment necessary for monitoring and control. The internal device is appropriately arranged in a metal outer box made of a grounded metal.

As one type of this type of switchgear, as disclosed in Japanese Patent Publication No. Hei 7-28488, a main circuit switch and a ground switch as main internal devices are integrated with a part of a connection conductor. There is a switchgear provided with a configured functional unit, which is arranged in a metal outer box and only needs to be connected to a bus and a power transmission cable.

FIG. 7 is a diagram showing a configuration of a main portion of a switchgear disclosed in Japanese Patent Publication No. 7-28488, and FIG.
Is an electrical connection diagram. The switchgear shown in FIGS. 7 and 8 is filled with an insulating gas and has a bushing 101 for connecting the power transmission cable and a bushing 102 for connecting the busbar (see FIG. 8) in a manner penetrating a part of the peripheral wall in and out. ), The first, second, third
And the vacuum arc extinguishing chamber 106 of the vacuum switch.

As shown in FIG. 8, a bus-side branch conductor 107 corresponding to each of the three phases connected to an external bus (not shown) via a bushing 102 for bus connection, as shown in FIG. The container 10 supported by the insulating support insulator 108
The fixed electrode 109 and the fixed electrode 109 formed inside the vacuum arc-extinguishing chamber 106 are disposed inside the vacuum arc extinguishing chamber 106.
Movable electrode 110 and first switch 103 movable with respect to
Are connected to an intermediate conductor 112 fixedly supported by the insulating support insulator 111, and are branched in two directions by the intermediate conductor 112. Each branch is connected to the second and third switches 10
Bushing 1 for power transmission cable connection via 4,105
The load-side conductor 113 is connected to an external power transmission cable (not shown) via the load-side conductor 113.

The switches 103, 104, and 105 are oscillating electrodes that oscillate about respective pivot shafts in accordance with the operation of each drive source (not shown) transmitted via the metal link 114 and the insulating link 115. 116 is provided.

[0007] The first switch 103 has its swing electrode 11
6, the movable electrode 110 in the vacuum arc-extinguishing chamber 106 is connected to the fixed electrode 109 projecting from the intermediate conductor 112 at a corresponding position, and the swing electrode 116 is grounded. The configuration is such that a grounding closed position for connecting the side conductor 117 and a disconnecting position intermediate between the two positions and separated from the fixed electrode 109 and the grounding side conductor 117 are realized.

[0008] Second and third switches 104 and 105
Due to the swing of the swing electrodes 116, 116, the first electrode and the ground-side conductor 118, 119 projecting at the corresponding positions of the load-side conductor 113 and the intermediate conductor 112, respectively. It is configured to realize the same three positions as the switch 103.

According to the above configuration, the bus-side branch conductor 10
A main circuit electrode part for contacting / separating the load side conductor 113 from the load side conductor 113 and a ground circuit electrode part for grounding the load side conductor 113 are connected to the container 10 in which an insulating gas is sealed together with the connection conductor.
0, the bus-side branch conductor 107 is connected to the bus outside the container 100 via the bushing 102, and the load-side conductor 113 is connected to the power transmission cable outside the container 100 via the bushing 101. do it.

[0010]

However, in the conventional switchgear as described above, the fixed electrode 109 and the movable electrode 110 in the vacuum arc extinguishing chamber 106 perform only the operation of opening and closing the main circuit, and the first switchgear. Reference numeral 103 denotes a disconnecting switch for disconnection from other circuits and a grounding switch for grounding the movable electrode 110 in the vacuum arc extinguishing chamber 106 under disconnection. Numerals 104 and 105 function as grounding switches for grounding the corresponding load-side conductors 113. Two switches (first switches) are provided between the bus-side branch conductor 107 and the load-side conductor 113. Switch 1
03 and the second switch 104 or the third switch 105)
Are arranged in series, miniaturization of the container 100 is restricted in order to secure these arrangement spaces, and
There was a problem that the cost was high.

Further, an insulating gas is sealed in the inside of the container 1.
Since the switches 103, 104, and 105 are disposed in the switch 00, the switches 103, 104, and 105 are sealed between the movable electrode and the fixed electrode between three phases, between the ground, and at the disconnection position. It is necessary to secure an insulation distance according to the type of gas, and the switches 103, 104, 10
5 becomes larger and each of the switches 103, 104, 1
In order to keep a sufficient interval between the containers 05, there is a problem that the arrangement efficiency in the container 100 is low, and the miniaturization of the container 100 is limited.

Further, since the vacuum arc extinguishing chamber 106 is provided for each single phase in the three-phase circuit shown in FIG. 8, the size of the container 100 is reduced in order to secure an arrangement position of the vacuum arc extinguishing chamber 106. However, there is a problem that the cost is limited and the product cost is increased.

Further, when an arc short circuit occurs in the container 100, a kind of explosion phenomenon in which the insulating gas sealed in the container 100 becomes high temperature and high pressure within a short time due to the arc energy is caused. Therefore, the container 100 needs to be provided with an open portion for high-pressure release, and is required to have strength to withstand a high-pressure state until the release of pressure, and the structure of the container 100 becomes complicated,
There has been a problem that the product cost is increased.

[0014] The present invention has been made in view of the above-described circumstances, and can significantly reduce the size and cost of the product as compared with the related art. It is an object of the present invention to provide a highly safe switchgear that does not cause any problem.

[0015]

A switchgear according to a first aspect of the present invention includes a main circuit connected to a load-side conductor in a single vacuum-grounded container capable of being evacuated and movable with respect to the vacuum-grounded container. And a fixed electrode for the main circuit connected to the bus-side conductor and a fixed electrode for the ground circuit connected to the ground-side conductor for single or multiple phases. A driving device for moving the movable electrode is provided outside the vacuum grounding container.

A switchgear according to a second aspect of the present invention is characterized in that the vacuum grounding container includes a bushing that insulates and supports the busbar-side conductor and projects outside the vacuum grounding container.

According to a third aspect of the present invention, in the switch gear, one of the fixed electrodes is disposed at one end of the vacuum grounding container, and the other is disposed at the other end, and a load-side conductor is interposed between the fixed electrodes. A movable conductor connected to the movable electrode is linearly movable and insulated and supported, and one end of the movable electrode is provided at one end of the movable conductor, and the other is provided at the other end.

According to a fourth aspect of the present invention, in the switchgear, the vacuum grounding container includes a rotatable operation shaft penetrating in a direction intersecting a moving direction of the moving conductor, and the moving conductor is linearly moved by the operation shaft. The operation shaft and the moving conductor are connected via a plurality of link members so as to perform the operation.

According to a fifth aspect of the present invention, in the switch gear, the moving conductor includes a closed position at which the movable electrode for the main circuit contacts the fixed electrode, and an open position at which the contact is separated, in response to driving of a driving device. The movable electrode for the ground circuit is configured to be movable between four positions including a disconnection position where the contact is further separated and a ground closed circuit position where the movable electrode for the ground circuit contacts the fixed electrode.

A switchgear according to a sixth aspect of the present invention is characterized in that a contact conductor that contacts and allows the movement of the moving conductor is provided in a conductive portion of the moving conductor to the load-side conductor.

A switchgear according to a seventh aspect of the present invention is characterized in that a flexible conductor which is elastically deformed with the movement of the moving conductor is provided in a conductive portion of the moving conductor to the load-side conductor.

According to an eighth aspect of the present invention, there is provided a switchgear having a fixed electrode for a main circuit at one end and a fixed electrode for a ground circuit at the other end in one vacuum grounding vessel capable of vacuum. A moving conductor connected to the load-side conductor for each phase is insulated and supported between the fixed electrodes so that the moving conductor can move linearly, and a movable electrode for the main circuit is provided at one end of the moving conductor. The other end is provided with a movable electrode for a ground circuit, respectively.
In order to linearly move the moving conductor, a driving device disposed outside the vacuum grounding container is driven via a plurality of link members and a rotatable operation shaft penetrating the vacuum grounding container, and the driving device is driven. In accordance with the movable conductor for the main circuit contacts the fixed electrode, the closed position, the open position where the contact is separated, the disconnect position where the contact is further separated, and the movable electrode for the ground circuit is fixed electrode. It is characterized in that it is configured to be able to move linearly between the four contact positions with the contacting ground closing position.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 The present invention will be described below in detail with reference to the drawings showing an embodiment. 1 to 5 show a configuration of a switchgear according to the present invention. FIG. 1 is a longitudinal side view showing a state where a movable electrode for a main circuit is moved to a closed position, FIG. FIG. 4 is a vertical sectional side view showing a state where the movable electrode for the main circuit is moved to the open position, FIG. 4 is a vertical sectional side view showing a state where the movable electrode for the main circuit is moved to the disconnected position, and FIG. It is a vertical side view of the state moved to the grounding closed circuit position.

The switchgear shown in FIGS. 1 to 5 has a main circuit connected to a bus-side conductor 2 at one end inside one hermetically sealed vacuum grounding vessel 1 whose inside is maintained at a high vacuum. Three fixed electrodes 3 are provided at the other end with a ground-side conductor 4
And three movable electrodes 7 connected to the load-side conductor 6 are insulated and supported between the fixed electrodes 3 and 5 so as to move linearly. A movable electrode 8 for the main circuit facing the fixed electrode 3 is provided at one end of the moving conductor 7, and a movable electrode 9 for the ground circuit facing the fixed electrode 5 is provided at the other end. Although the switch gear is a three-phase switch gear, the structure of each phase is the same. Therefore, the structure of one phase will be mainly described below.

At one end of the vacuum-grounded container 1, three bus-bar-side conductors 2 penetrating the vacuum-grounded container 1 inside and outside are provided with three bushings 10 on the bus-bar side having insulation provided outside the vacuum-grounded container 1. The fixed electrode 3 is provided at an inner end of the bus-side conductor 2 on the inner side of the vacuum grounding container 1,
The projecting end of each busbar side conductor 2 to the outside of the vacuum grounding container 1 is
A bus bar 11 provided outside the vacuum grounding vessel 1 is connected via a connection conductor 12.

At the other end of the vacuum grounding container 1, three ground-side conductors 4 penetrating the vacuum grounding container 1 in and out via three insulating bushings 13 provided inside the vacuum grounding container 1. The fixed electrodes 5 are provided at the inner ends of the ground-side conductors 4 inside the vacuum grounding container 1, and the protruding ends of the respective grounding-side conductors 4 outside the vacuum grounding container 1 are appropriately grounded.

On one side surface of the intermediate portion of the vacuum grounding container 1, three load-side conductors 6 penetrating the vacuum grounding container 1 in and out,
It is insulated and supported through three bushings 14 having insulation properties, and the end of the load-side conductor 6 inside the vacuum grounding vessel 1 is always in contact with the middle of each of the above-mentioned moving conductors 7, so that the moving conductor 7 moves linearly. An allowable annular contact conductor 15 is provided, and the end of each load-side conductor 6 protruding outside the vacuum grounding container 1 is connected to three external cables 16.

On the other side of the intermediate portion of the vacuum grounding vessel 1, there is provided an insulating flat support 17 provided with three through holes 17a for supporting the moving conductors 7, and the support 17 is provided. The movable conductor 7 is supported in each of the through holes 17a so as to be linearly movable toward the fixed electrodes 3 and 5.

The moving conductor 7 is formed by using a single rod-shaped member having conductivity.
The intermediate portion on the fixed electrode 3 side is moved in and out of the vacuum grounding container 1 in a direction (substantially orthogonal direction) intersecting with the first and second link members 18 and 19 and the moving direction of the moving conductor 7. It is operatively connected to a driving device 21 via a rotatable operation shaft 20 provided therethrough. In addition, the contact conductor 15 is inserted into an intermediate portion of the movable conductor 7 on the fixed electrode 5 side with respect to the support 17.

The first link member 18 has an insulating property. One end of the first link member 18 is fixed to the operation shaft 20, and the other end of the first link member 18 and the moving conductor 7 are connected to the second link member 1.
9 are connected to each other by a connecting pin so as to be relatively rotatable, and the circular motion of the other end of the first link member 18 due to the rotation of the operation shaft 20 is converted into a linear motion by the second link member 19.
The driving force is transmitted to an intermediate portion of the moving conductor 7 so that the moving conductor 7
Is moved linearly.

The operating shaft 20 is kept airtight from the outside of the vacuum grounding container 1 by a sealing member 22, and is separated from the moving conductor 7 that is energized by the first link member 18 having an insulating property. Is insulated.

In the switchgear configured as described above, the energization from the bus 11 is applied to the vacuum
Is applied to the fixed electrode 3 for the main circuit from the bus-side conductor 2 which is insulated and supported at one end of the main circuit. Also, the external cable 16
Load-side conductor 6 insulated and supported on one side of vacuum-grounded container 1
Electric current is supplied to the moving conductor 7 from the contact conductor 15 that contacts the intermediate portion of the moving conductor 7. The contact conductor 15 keeps electrical contact even when the moving conductor 7 moves linearly, and energizes the moving conductor 7.

In the state shown in FIG. 1, the moving conductor 7 is
In a closed state where the movable electrode 8 for the main circuit and the fixed electrode 3 are in contact with each other and the current from the bus 11 is supplied with the connection conductor 12, the bus-side conductor 2, and the main circuit. Fixed electrode 3 and movable electrode 8, movable conductor 7, contact conductor 1
5. Power is supplied from the load-side conductor 6 to the external cable 16.

Next, the operation shaft 20 is rotated by a predetermined angle in the counterclockwise direction in FIG.
By moving the moving conductor 7 to the open circuit position on the other end side of the vacuum grounding container 1 and separating the movable electrode 8 for the main circuit from the fixed electrode 3, the movable electrode 8 for the main circuit is moved from the bus 11 as shown in FIG. Is cut off and the circuit is opened.

Next, the operating shaft 20 is further rotated counterclockwise in FIG. 3 by a predetermined angle by the driving device 21 from the open state in FIG. 3 to move the moving conductor 7 to the disconnection position on the other end side of the vacuum grounding vessel 1. By moving the movable electrode 8 for the main circuit away from the fixed electrode 3 by one step from the open state of FIG. 3, the insulation distance between the movable electrode 8 and the fixed electrode 3 increases, and as shown in FIG. The electric circuit to the movable electrode 8 for the main circuit is cut off, and the circuit is disconnected.

Next, the operating shaft 20 is further rotated counterclockwise in FIG. 4 by a predetermined angle by the driving device 21 from the disconnected state shown in FIG. 4 to move the movable conductor 7 to the grounding closed position at the other end of the vacuum grounding vessel 1. The movable electrode 9 for the ground circuit is brought into contact with the fixed electrode 5 as shown in FIG.
6 is grounded.

Further, the driving device 2 is shifted from the grounded closed state shown in FIG.
By rotating the operating shaft 20 by a predetermined angle in the clockwise direction in FIG. 5 by 1, the sequentially moving conductor 7 linearly moves to one end side of the vacuum grounding container 1, and from the grounded closed state to the disconnected state in FIG.
The switching state can be switched between the open state of FIG. 3 and the closed state of FIG.

Embodiment 2 FIG. 6 is a longitudinal sectional side view showing a configuration of a switch gear according to Embodiment 2 of the present invention.

In the second embodiment, a flexible conductor 23 which is elastically deformed with the movement of the moving conductor 7 is provided in place of the contact conductor 15 in the first embodiment. Since this embodiment is the same as the first embodiment, drawings and detailed description of common points are omitted.

The flexible conductor 23 is formed in an elongated flat plate shape as shown in FIG.
The other end is fixed to the moving conductor 7 by a mounting screw, and the intermediate portion is freely deformed by the linear movement of the moving conductor 7.

In the switchgear configured as described above, the same operation and effect as in the first embodiment can be obtained, and the flexible conductor is elastically deformed with the movement of the moving conductor. Without being affected, conduction of the moving conductor to the load-side conductor can be reliably maintained.

In the above embodiment, a three-phase switchgear has been described. Alternatively, a four-phase or higher switchgear or a single-phase switchgear may be used.

[0043]

As described above in detail, according to the switchgear of the first invention, the single-phase or multi-phase components of the main circuit electrode portion and the ground electrode portion, which become high voltage, are connected to one vacuum ground having excellent insulation characteristics. Inside the container, the movable electrode of each electrode unit, to be moved by a driving device provided outside the vacuum grounding container,
Furthermore, since the bus bar is arranged outside the vacuum grounding container, the main circuit electrode portion and the grounding electrode portion that become high voltage can be compactly arranged, and the whole can be downsized.
Further, the product cost can be reduced. In addition, since the current interrupting function and the function as a disconnector can be integrated into a vacuum grounded container to achieve multi-function, the product cost can be further reduced, and an arc short circuit inside the container can be achieved. Since there is no fear that the occurrence of explosion causes an explosion, a container structure for the explosion is not required, and the product cost can be further reduced.

According to the switchgear according to the second aspect of the present invention, one vacuum grounding container in which the main circuit electrode portion and the grounding circuit electrode portion are housed is defined as one functional unit, and the busbar side projecting outside the vacuum grounding container. By connecting the conductor to the bus bar wired outside the vacuum grounding container, one functional unit can be mounted, so that expansion of a plurality of functional units can be facilitated.

According to the switchgear of the third invention, 1
Since the movable electrode for the main circuit and the movable electrode for the grounding circuit are provided on one moving conductor, the supporting structure can be simplified by using one supporting portion for the movable electrode, and the driving device for the movable electrode is provided as one device. The drive structure can be simplified, and further downsizing and reduction in product cost can be achieved.

According to the switchgear according to the fourth aspect of the present invention, the moving conductor can be moved via the link member by rotating one operation shaft penetrating the vacuum grounding container. The number of sealing locations can be reduced, the structure can be simplified, and the product cost can be further reduced.

According to the switchgear of the fifth aspect, the moving conductor can be linearly moved between the closed state, the open state and the disconnected state of the main circuit electrode portion, and the grounded closed state of the ground circuit electrode portion. Further, it is possible to further reduce the size and reduce the product cost.

According to the switchgear according to the sixth aspect of the present invention, the moving conductor can be moved in the vacuum grounding vessel while always in contact with the contact conductor, so that the moving conductor is not affected by the movement of the moving conductor. The moving conductor can be reliably conducted to the load-side conductor.

According to the switchgear according to the seventh aspect of the present invention, the flexible conductor is elastically deformed in accordance with the movement of the moving conductor in the vacuum grounding vessel, so that the moving conductor is not affected by the movement of the moving conductor. Conduction to the load-side conductor can be reliably maintained.

According to the switchgear according to the eighth aspect of the present invention, the main circuit electrode portion and the ground electrode portion having a high voltage are single-phase or multi-phase components are housed in a single vacuum grounding container having excellent insulation properties.
The movable electrode of each electrode portion is moved by a driving device provided outside the vacuum grounded container, and further, since the bus is arranged outside the vacuum grounded container, a main circuit electrode portion having a high voltage and The ground electrode portion can be arranged compactly, and furthermore, the supporting structure can be simplified by using one supporting portion for the movable electrode, and the driving structure can be simplified by using one driving device for the movable electrode. Since the main circuit electrode portion can be linearly moved between a closed state, an open state, and a disconnected state of the main circuit electrode portion, and a grounded closed state of the ground circuit electrode portion, the size and the cost of the product can be significantly reduced as compared with the conventional product described above. It can be reduced. In addition, since there is no possibility that the occurrence of an arc short circuit inside the container will cause an explosion, a container structure for the explosion is unnecessary, and the product cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a switchgear according to a first embodiment of the present invention, in which a movable electrode for a main circuit has moved to a closed position.

FIG. 2 is a vertical sectional front view of the switchgear shown in FIG.

FIG. 3 is a vertical sectional side view of the switchgear according to the first embodiment of the present invention in a state where a movable electrode for a main circuit has moved to an open circuit position.

FIG. 4 is a vertical sectional side view of the switchgear according to the first embodiment of the present invention, in which a movable electrode for a main circuit has moved to a disconnection position;

FIG. 5 is a vertical sectional side view of the switchgear according to the first embodiment of the present invention, in which the movable electrode for the grounding circuit has been moved to the grounding closed position.

FIG. 6 is a vertical sectional side view of a switchgear according to a second embodiment of the present invention, in which a movable electrode for a main circuit has moved to a closed position.

FIG. 7 is a diagram showing a configuration of a main part of a conventional switchgear.

FIG. 8 is an electrical connection diagram of a conventional switchgear.

[Explanation of symbols]

1 Vacuum ground container, 2 busbar side conductor, 3 fixed electrodes for main circuit, 4 ground side conductor, 5 fixed electrodes for grounding circuit,
6 load side conductor, 7 moving conductor, 8 movable electrode for main circuit, 9 movable electrode for ground circuit, 10 bushing, 1
1 busbar, 15 contact conductors, 17 support, 18 first
Link member, 19 second link member, 20 operating shaft, 2
1 drive, 23 flexible conductor.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeaki Yamanaka 2-3-35 Fujimi-cho, Sakaide-shi, Kagawa

Claims (8)

[Claims] 1. A movable electrode for a main circuit and a movable electrode for a ground circuit connected to a load-side conductor and movable in a vacuum-grounded container and connected to a load-side conductor. A fixed electrode for the main circuit to be connected and a fixed electrode for the ground circuit connected to the ground side conductor are provided for a single phase or multiple phases, and the movable electrode is moved outside the vacuum grounding container. A switchgear comprising a driving device. 2. The switchgear according to claim 1, wherein the vacuum grounding container is provided with a bushing that insulates and supports the busbar-side conductor and protrudes outside the vacuum grounding container. 3. One of the fixed electrodes is disposed at one end in the vacuum grounding container, and the other is disposed at the other end, and a moving conductor connected to the load-side conductor is provided between the fixed electrodes. 3. The switchgear according to claim 1, wherein one of the movable electrodes is provided at one end of the movable conductor and the other is provided at the other end of the movable conductor. 4. The vacuum grounding container has a rotatable operation shaft penetrating in a direction intersecting with a moving direction of the moving conductor, and the operating shaft and the moving shaft move the moving conductor linearly by the operation shaft. The switchgear according to claim 3, wherein the conductors are connected via a plurality of link members. 5. The moving conductor includes a closed position where the main circuit movable electrode contacts a fixed electrode, an open position where the contact is separated, and a disconnected position where the contact is further separated in response to driving of a driving device. 5. The switchgear according to claim 3, wherein the movable electrode for the grounding circuit is movable between four positions, that is, a grounded closed position in contact with the fixed electrode. 6. A switchgear according to claim 3, wherein a contact conductor is provided at a conductive portion of the moving conductor to the load-side conductor, the contact conductor being in contact with and allowing movement of the moving conductor. 7. A switch gear according to claim 3, wherein a flexible conductor which is elastically deformed as the movable conductor is moved is provided in a conductive portion of the movable conductor to the load-side conductor. 8. A fixed electrode for a main circuit is disposed at one end in one vacuum grounding vessel capable of vacuum, and a fixed electrode for a ground circuit is disposed at one end in a single-phase or multi-phase. A movable conductor connected to the load-side conductor for each phase is insulated and supported between the fixed electrodes so that the movable conductor can move linearly. A movable electrode for the main circuit is provided at one end of the movable conductor, and a movable electrode for the ground circuit is provided at the other end. A movable electrode is provided, and a driving device disposed outside the vacuum grounding container via a plurality of link members and a rotatable operation shaft penetrating the vacuum grounding container so as to linearly move the moving conductor. In response to the driving of the driving device, the movable conductor is moved to a closed position where the movable electrode for the main circuit contacts the fixed electrode, an open position where the contact is separated, a disconnect position where the contact is further separated, and grounding. Closed ground when movable electrode for circuit contacts fixed electrode A switchgear configured to be linearly movable between four positions with a road position.