WO2004032169A1

WO2004032169A1 - Vacuum beaker

Info

Publication number: WO2004032169A1
Application number: PCT/JP2002/010171
Authority: WO
Inventors: Takashi Ohgi; Minoru Kobayashi; Keiji Goto; Kazuaki Oyama
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2002-09-30
Filing date: 2002-09-30
Publication date: 2004-04-15
Also published as: AU2002335467A1; JPWO2004032169A1; CN1596453A; CN100369172C; TW563149B; KR100554629B1; KR20040068157A; JP4246151B2

Abstract

A vacuum valve is disposed in one side across a base plate. The fixed electrode terminal at the fixed electrode end of the vacuum valve and the moving electrode terminal at the moving electrode end are supported by a pair of insulation supports erected on the base plate. The opposite side of the vacuum valve across the base plate is fitted with an operation mechanism. The operation mechanism is coupled with a contact switching link mechanism connected to the moving electrode by means of a drive means disposed inside the insulation support along the support direction.

Description

Description Vacuum circuit breaker Technical field

The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker suitable for use in a switchgear for controlling switching of electric power. Background art

Figures 8 and 9 show examples of conventional gas-insulated switchgear using vacuum circuit breakers. Figure 8 shows the rated voltage published in the Journal of the Institute of Electrical Engineers of Japan (issued in October 2001). FIG. 2 is a side sectional view showing a gas insulated switchgear of the kV or 84 kV class. In the figure, 1 is a gas insulated switchgear, 2 is a main container filled with SF ₆ gas as an insulating medium, 3 is a bus room, which houses a three-phase bus 4 arranged between a plurality of juxtaposed devices. I have. 5 is a disconnecting switch for connecting and disconnecting the branch main circuit branched from the bus 4, 6 is a vacuum circuit breaker whose upper terminal is connected to the disconnecting switch 5 by the connecting conductor 5a, 7 is a connecting conductor to the lower terminal of the circuit breaker 6 a disconnector that connects and disconnects a connection conductor 8 to be described later to connect and disconnect the circuit, 8 is a three-phase connection conductor arranged vertically at the rear of the main tank 2, 9 is a connection conductor 8 10 is a cable head connected to the cable head connection 9 through the wall of the main container 2, 11 is a cable head connected to the cable head 10. This is a cable with one end inserted and connected. The circuit from bus 4 to cable 11 is usually called the main circuit. Reference numeral 12 denotes a CT mounted on the outer periphery of the cable 11, reference numeral 13 denotes a grounding switch that contacts and separates from the connection conductor 8 to ground the main circuit, and reference numeral 14 denotes an arrester.

As described above, the main devices such as the disconnector 5, the vacuum circuit breaker 6, the disconnector 7, and the cable head 10 of the gas insulated switchgear are all connected to the other conductors 5a, 7a, and 8 by other conductors. Connected to equipment. FIG. 9 is a side view of the vacuum circuit breaker 6 used in the apparatus of FIG. 8, in which 15 is a base, 16 is a vacuum valve, and 17 is an end of the vacuum valve 16 on the movable electrode side. The mounted movable electrode side terminal, 18 is the fixed electrode side terminal attached to the fixed electrode side end of the vacuum valve 16, 19 is the movable electrode side terminal 17 and the fixed electrode side terminal 18 are supported Insulation support, 20 and 21 are connection contacts for connection to the main circuit, 22 is a contact pressure link mechanism that drives the movable electrode (not shown) of the vacuum valve 16, 23 Denotes an operation mechanism mounted on the base 15, 24 denotes a drive rod connecting the contact pressure link mechanism 22 and the operation mechanism 23, and 25 denotes an electric field mitigation shield covering the outer periphery of the contact pressure link mechanism.

In the conventional vacuum circuit breaker 6 as described above, the drive rod 24 is exposed above or below the vacuum circuit breaker 6 in the main container 2 of the gas insulated switchgear that houses the drive rod 24. It was necessary to ensure a space insulation distance, which caused the main container 2 to be large. As a result, the size of the gas insulated opening / closing device itself increases due to the need to increase the size of the main container 2, and the cost of construction of the electric room increases due to an increase in transportation costs and installation space. There was a problem that the usage of _six gases would increase.

The present invention has been made to address the above-described problems, and an object thereof is to obtain a miniaturized vacuum circuit breaker. Another object of the present invention is to provide a vacuum circuit breaker capable of reducing a spatial insulation distance between the apparatus and surrounding equipment. Yet another objective is to obtain a vacuum circuit breaker that is easy to assemble. Disclosure of the invention

(1) A vacuum circuit breaker according to the present invention includes: a base which is hermetically attached to the container wall as a part of a container wall of a gas insulated switchgear; a pair of insulating supports provided on the base; A vacuum valve having a terminal and a movable electrode side terminal, wherein the insulating support body supports the two terminal portions and is attached to the base; an operating mechanism provided on the base; an operating mechanism provided on the base; An operation link mechanism connected between the movable electrode side terminal of the valve and the movable valve to open and close the vacuum valve. A vacuum circuit breaker, wherein the operation link mechanism extends through the insulating support and is covered by the insulating support.

(2) The fixed electrode side terminal and the movable electrode side terminal of the vacuum valve may be provided with a connector that can be connected to a main circuit conductor of a gas insulation switchgear.

(3) Each of the fixed electrode side terminal and the movable electrode side terminal may include an electric field relaxation case.

(4) The vacuum circuit breaker of the present invention also includes a base, a vacuum valve disposed on one side of the base, a fixed terminal conductor connected to a fixed electrode side end of the vacuum valve, and a vacuum valve. A contact opening / closing link mechanism connected to the movable electrode side, a movable terminal conductor connected to the movable electrode side of the vacuum valve, and the fixed terminal conductor and the movable terminal conductor standing on the base. A pair of insulating supports respectively supporting the operation base, an operation mechanism mounted on the opposite side of the vacuum valve across the base, and the operation mechanism disposed inside the insulation support along a supporting direction and the contact opening and closing It is a vacuum circuit breaker provided with a drive member for connecting and driving a link mechanism.

(5) The fixed-side terminal conductor is in contact with the fixed electrode side end of the vacuum valve to support the vacuum valve, an enclosing portion that supports this support and surrounds the container in an open container shape, and other main circuits. And a terminal portion that comes in contact with and separates from the terminal.

(6) The movable terminal conductor may surround the contact opening / closing link mechanism connected to the movable electrode side of the vacuum valve in an open container shape, and may have a terminal portion that comes in contact with and separates from another main circuit.

(7) The outer peripheral surfaces of the fixed-side terminal conductor and the movable-side terminal conductor may be formed by connecting different planes with curved surfaces.

(8) The outer diameter of both ends of the cylindrical portion of the vacuum valve may be covered with a fixed terminal conductor and a movable terminal conductor.

(9) The base may constitute a part of the container wall of the gas insulated switchgear.

(10) The contact opening / closing link mechanism may be a contact pressure link mechanism supported by a movable terminal conductor. (11) The insulating support for supporting the movable-side terminal conductor may have a hollow cylindrical shape, and a drive member for connecting and driving the operating mechanism and the contact opening / closing link mechanism may be arranged inside the hollow cylindrical support.

(12) On the mounting side of the operating mechanism of the base, an airtight chamber is provided that communicates with the hollow hole of the insulating support that supports the movable-side terminal conductor, and a drive member that connects the operating mechanism and the contact opening / closing link mechanism is provided in this chamber. The lever may be connected and driven, and a lever shaft connected to the operation mechanism with one end of the operation rod penetrating the wall of the airtight chamber. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side sectional view of a gas insulated switchgear accommodating the vacuum circuit breaker of the present invention. FIG. 2 is a side sectional view showing a state where a vacuum circuit breaker is pulled out from the gas insulated switchgear of FIG.

FIG. 3 is a side sectional view showing the vacuum circuit breaker of FIG.

FIG. 4 is a rear view of the vacuum circuit breaker of FIG.

FIG. 5 is a plan view of the vacuum circuit breaker of FIG.

FIG. 6 is a perspective view of a movable electrode side terminal of the circuit breaker of FIG.

FIG. 7 is a view of the lever shaft of the circuit breaker of FIG. 3 as viewed from the direction of arrows A—A of FIG. FIG. 8 is a sectional view showing a conventional gas insulated switchgear.

FIG. 9 is a side view of the vacuum circuit breaker of the gas insulated switchgear shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

1 to 7 show a gas insulated switchgear using the vacuum circuit breaker of the present invention. In the figure, 50 is a main body container in which SF ₆ gas is sealed as an insulating medium, 51 a is a first bus room mounted on the upper part of the main body container 50, 51 b is a first bus room 51. The second bus chambers 52 a and 52 b arranged adjacent to a are buses connected and connected to a plurality of gas insulation opening / closing devices juxtaposed. In the bus room 51a, a disconnector 53 is connected to a branch line 52b from the bus 52a by a port or the like. Disconnection The vessel 53 intermittently connects and disconnects the branch main circuit by moving the movable contact portion 53a left and right in FIG. 1 and moving it toward and away from the fixed contact portion 53b. The fixed contact portion 53b is attached to the tip of a penetrating conductor 54a that extends into a bushing 54 supported by penetrating a partition wall between the main container 50 and the bus bar 51a with bolts or the like. Have been. Inside the main body container 50, a first grounding switch 55 supported at the lower end of the through conductor 54 of the pushing 54 supported on the partition wall between the busbar room 51a and the main body container 50 Is set up. The grounding switch 55 drives a fixed contact 55 b provided in the main body container 50, a movable contact 55 a that moves in and out of contact with the fixed contact 55 b, and a movable contact 55 a A link mechanism 55d and a substantially hollow conductive case 55c for electric field relaxation that cover the link mechanism 55d are provided. The conductive case 55c of the grounding switch 55 is directly connected mechanically and electrically to the through conductor 54a. Such a direct connection is achieved by, for example, screwing a port (not shown) extending through the conductive case 55c from the inside into a bolt hole provided at the lower end of the through conductor 54a. This can be achieved by holding the conductive case 55c between the lower end of the conductor 54a and the port head. The movable contact 55a moves left and right in Fig. 1 (front and back of the gas insulated switchgear), and contacts and separates from the fixed contact 55b to ground the main circuit. At the lower part of the conductive case 55c of the grounding switch 55, a connection conductor 56 formed in an L-shape as viewed from the side is fixed by bolts or the like, and the lower end thereof is later described with reference to FIGS. The connection part 57 connected to the connection terminal 82 (see Fig. 3) provided on the terminal part 71a of the vacuum circuit breaker 58 described in detail in connection with 5, is provided facing the front side of the main container. Have been. The details of the vacuum circuit breaker 58 connected to the grounding switch 55 via the connection portion 57 will be described with reference to FIGS. 3 to 5, but the vacuum circuit breaker 58 is provided on the front side of the main body container 50. Base 74 attached so as to cover the opening 50a, an operating mechanism 77 provided on the outer surface of the base 74, and insulating supports 75 and 7 provided on the inner surface of the base 74. And a vacuum valve 70 supported by the insulating support members 75 and 76 at the fixed electrode side terminal portion 70a and the movable electrode side terminal portion 70b and having a fixed electrode and a movable electrode. Have. Separate each terminal 70 a and 70 b of vacuum valve 70 The fixed electrode-side terminal 71 and the movable electrode-side terminal 72 that are supported are provided with an electric field relaxation case whose outer periphery has a curved surface shape in order to reduce the electric field. The fixed electrode-side terminal 71 and the movable electrode-side terminal 72 are attached to insulating supports 75 and 76, respectively, by a suitable fixing means such as a ponolet.

The lower movable electrode side terminal portion 70 b of the vacuum circuit breaker 58 is grounded via a connector provided on a movable electrode side terminal 72 attached to an insulating support 76 by a bolt or the like. It is connected to the connector 59 d of the switch 59. The earthing switch 59 includes a movable contact 59 a that moves in the front-rear direction (left and right in the figure) of the main body container 50 in FIG. 1 by the rotation of the operation shaft 59 c. a contacts and separates the fixed contact 59 b to ground the main circuit. The movable contact side of the grounding switch 59 facing the front side of the main body container 50 is covered with a conductive case 59 e for electric field relaxation, and the connector 59 d is connected to the conductive case 59 e. Mounted on the front and connected to the terminal of vacuum circuit breaker 58.

A disconnector 60 is provided on the rear wall of the main body container 50. The disconnector 60 has a movable contact portion 60a, a fixed contact portion 60b, and a movable contact portion 60a, and the operation shaft 60f is rotated between the movable contact portion 60a and the fixed contact portion 60b in FIG. A movable contact 60 c that moves up and down to contact and separate from the movable contact section 60 a to interrupt the main circuit, a movable contact section 60 a mounted on the base 60 e and a fixed contact section 60 a b. The movable contact portion 60a and the fixed contact portion 60b are covered with a conductive case 60g for reducing the electric field and a conductive case 60h attached to the insulating support 60d. The disconnector 60 is mounted in the main body container 50 by fixing the base 60 e to the rear wall of the main body container 50. The conductive case 60 h of the disconnector 60 and the conductive case 59 e of the grounding switch 59 are electrically connected to each other by bolts (not shown).

On the rear wall of the main body container 50, there is provided a grounding switch 61 which is disposed above the disconnector 60 and grounds the main circuit via the main body container 50. By rotating the operation shaft 61c, the movable contact 61a that moves left and right toward the rear of the main body container 50 in Fig. 1 comes into contact with and separates from the fixed contact 61b to ground the main circuit. This grounding switch 6 1 Operation unit The outer periphery of the switch is also covered with a conductive case 61 d for reducing the electric field in the same manner as the disconnector 60, and this conductive case 61 d directly contacts the conductive case 60 g of the disconnector 60 and is bolted. And so on.

Above the disconnector 61, a cable head connecting member 62 is further provided. The cable head connecting member 62 includes a contact 62 a connected to the distal end connecting portion of the cable head 63 inserted through the rear wall of the main body container 50. The shaft 62c, the operation shaft 62c rotates the contact rod 62b attached to and detached from the lower end of the lightning arrester 65 attached to the main body 50 by the rotation of the shaft 62c, and the outer periphery of the cable head connecting member 62 A conductive case 62 d for covering the electric field is provided. A cable 6 4 extends from the cable head 6 3.

Grounding switch 59, disconnecting switch 60, grounding switch 61, conductive case 59 covering outer circumference of cable head connection member 62, 59e, 60g, 60h, 6Id And 62 d may independently cover the outer periphery of each device as shown in the figure, but may also be a frame in which the outer peripheral portion of each device has been subjected to shape processing for electric field relaxation.

In addition, as shown in FIG. 1, a grounding switch 59 is firmly joined to the lower part of the fixed contact portion 60b of the disconnector 60 by using bolts or the like so as to join the respective conductive cases. In addition, a grounding switch 61 is firmly joined to the upper part of the movable contact portion 60a of the disconnector 60 by using a port or the like so as to join the respective conductive cases. Further, a cable head connecting member 62 is firmly joined to the upper part of the grounding switch 61 by using bolts or the like in a manner of joining the respective conductive cases.

As described above, the conductive case of the grounding switch 59, the disconnecting switch 60, the grounding switch 61, and the cable head connecting member 62 is directly and firmly connected to each other, so that there is no need to separately prepare connection conductors. Part of the main circuit can be configured, and each device can be compactly configured. In addition, the base 60e is located below the disconnector 60, so that only one base is used to combine the ground switch 59, disconnector 60, and ground switch 61 into a single switch. Unit 6 can be formed. In addition, the switch unit 66 has a cable head connecting member 62 added as shown in Figs. 1 and 2. The switch unit may be handled as 6. The switch unit 66 can be easily removed from the main body container 50 as one assembly by disconnecting the main body container 50 from the base 60e.

FIG. 2 shows a state where the vacuum circuit breaker 58 is removed from the state of FIG. In the figure

50a is a circuit breaker mounting opening on the front of the main container. The first connector 57 and the second connector 59 d are arranged in the insertion direction of the circuit breaker 58, making it easy to insert the circuit breaker 58 into the main container 50. Can be attached to

In addition, nothing is arranged below the position where the circuit breaker 58 is removed, so that people can easily enter and the inspection work becomes easier.

In addition, the operation direction of the movable contact 60 c of the disconnector of the switch unit 66 is moved up and down, and the movable contacts 59 a and 61 of the lower ground switch 59 and the upper ground switch 61 are also moved. Since the operation direction of a is made to move toward the rear of the main body container 50, the height of the opening / closing unit 66 can be configured to be low (as a result, the main body container 50 can be reduced), and the opening and closing can be performed. Removing the unit-Insertion work becomes easy. 3 to 7 show details of the vacuum circuit breaker 58. In the drawings, 70 is a movable inside, a vacuum valve having a fixed electrode, and 71 is a fixed electrode side terminal of the vacuum valve 70. The outer periphery has a curved shape to reduce the electric field. It has a support part for supporting it. Reference numeral 72 denotes a movable electrode side terminal of the vacuum valve 70.The outer periphery has a curved surface shape in order to reduce an electric field, and has a flexible conductor connecting portion bridging the left and right walls of the movable electrode side terminal 72 in a bridge shape. The movable electrode portion of the vacuum valve 70 and the flexible conductor connection portion 72 a are connected by a flexible conductor 73.

Reference numeral 74 denotes a plate-like base that also serves as a part of the side wall of the main body container 50, reference numeral 75 denotes an insulating support that stands on one surface of the base and supports the fixed electrode side terminal 71, and reference numeral 76 denotes a through hole therein. 7

An insulating support which has 6a and is erected on one surface of the base 74 in the same manner as the insulating support 75 and supports the movable electrode side terminal 72.77 is a vacuum valve 70 with the base 74 interposed therebetween. 7 8 is the operation mechanism of the base 7 4 7 8 The operation lever chamber, which is formed airtight by pressing a box-shaped body against the cut surface, communicates with the through hole 76a through a hole 74a formed in the base.

Numeral 9 denotes a lever shaft for distributing the driving force of the operating mechanism 77 to the movable electrode of the vacuum valve 70 by levers 9 9 a corresponding to each phase, and a bearing mounted on the base 74 of the operating lever chamber 78. And one end penetrates the upper wall of the lever chamber 78 and is led out to the outside and connected to the operating mechanism 77 via the operating rod 77a. Reference numeral 80 denotes a contact pressure link mechanism that rotates about a shaft 80a supported by the movable electrode terminal 72 and connected to the movable electrode rod 70b of the vacuum valve 70, and rotates the shaft 80a. It has a lever 8Ob that rotates as a shaft, and a contact pressure spring 80c that is pivotally mounted at one end to the lever 80b and the other end is connected to the movable electrode rod 70b. .

8 1 connects the lever 7 9 a and the other end of the lever 8 0 b of the contact pressure link mechanism 80, and drives the drive port, and 8 2 is formed almost in an L shape when viewed from the side A connection terminal protruding in the insertion direction of the circuit breaker 77 at a rising portion above the fixed electrode side terminal 71, and is separated from and connected to the first contact 57. Reference numeral 83 denotes a connection terminal that protrudes from the lower part of the movable electrode side terminal 72 in the insertion direction of the circuit breaker 77, and is connected to the second contact 59d. Reference numeral 84 denotes a shield that covers the outer periphery of the intermediate portion of the vacuum pulp 70 in a cylindrical shape.

Further, as shown in FIG. 6, the movable electrode side terminal 72 has a hollow, conductive electric field relaxation case having a substantially curved outer surface. Since the wrapping and the side walls are further extended in the insertion direction of the circuit breaker 58 than the flexible conductor 73 or the contact pressure link mechanism 80, the electric field relaxation effect in this portion is increased, and the movable electrode side The space insulation distance between the terminal # 2 and other members near the periphery can be reduced. The movable electrode side terminal 72 has a flange portion 72b for mounting to the insulating support 76 with bolts, and the drive port 81 is penetrated through the flange portion 72b. The movable electrode side terminal 72 also has a circular opening 72c at the top to receive the lower end of the vacuum valve 70, and a lower connection to another connection conductor (such as the connector 59d in Fig. 1). To derive the connector 8 3 It has an opening 72d (FIG. 4). In addition, an opening 72d for assembling adjustment for the pivot of the link mechanism housed inside is provided on the side surface of the electric field relaxation case 72a.

The fixed electrode side terminal 71 also has a similar structure with the electric field mitigating case shown in Fig. 6, and is fixed to the insulating support 75 with a port, and covers and supports the upper end of the vacuum valve 70. It has a curved surface structure that has an opening 71c to allow connection to a connection conductor (connector 57 in Fig. 1 etc.) via the connector 82, and reduces the electric field around the fixed electrode side terminal 71. ing.

FIG. 7 is a schematic view of the lever shaft 79 of the vacuum circuit breaker 58 shown in FIG. 3, as viewed from the left side in FIG. The lever shaft 79 is rotatably supported by a bearing 79 d provided in an airtight lever chamber 78 attached to the base 74. A lever 79 b is fixed to the lever shaft 79, and an operating port 77 a extending from the operation mechanism 77 via a link 79 f is connected to the lever 79 b. The operating port 7 7a penetrates through the lever chamber 78 with airtightness maintained by a seal 79e, and the lever shaft 79 is rotated by the operating mechanism 77. Arms 79a, the ends of which are connected to the drive ports 81, are fixed to the lever shafts 79 in the lever chambers 78, and the drive rods 81 are operated by the rotation of the lever shafts 79. It is to be done.

As described above, the vacuum circuit breaker 58 of the present invention is provided on the outer surface of the base 74, which is hermetically attached to the main container 50 as a part of the main container 50 of the gas insulated switchgear, for example. And a pair of insulating supports 75 and 76 provided. The base 74 is also provided with a vacuum valve 70 supported by the fixed electrode side terminal 71 and the movable electrode side terminal 72 by the insulating supports 75 and 76. An operation mechanism 77 is provided on one side of the base, and a drive port 8 for opening and closing the vacuum valve 70 is provided between the operation mechanism 77 and the movable electrode side terminal 72 of the vacuum valve 70. 1 and a contact pressure link mechanism 80 are provided. The drive rod 81 extends through an insulating support 76 that supports the movable electrode side terminal 72, and is covered by the insulating support 76. The fixed electrode side terminal 71 and the movable electrode side terminal 72 of the vacuum valve 70 are provided with connectors 82 and 83, respectively, which can be connected to the main circuit conductor of the gas insulated switchgear. Each of the fixed electrode side terminal 71 and the movable electrode side terminal 72 has an electric field relaxation case.

With such a configuration, the following effects can be obtained. By passing the drive member 81 through the through hole 76a of the insulating support 76, there is no need to dispose the drive rod 24 above the upper insulating support 19 as in the conventional example in FIG. Therefore, the height of the circuit breaker can be significantly reduced as compared with the configuration in FIG. Also, by increasing the effect of alleviating the electric field around the fixed electrode side terminal 71 and the movable electrode side terminal 72, the spatial insulation distance between each phase or between the ground (between each phase and the main body container 50) is reduced. Therefore, the device can be made compact.

Further, as shown in FIG. 1 or FIG. 3, both ends of the vacuum valve 70 are inserted into the fixed electrode side terminal 71 and the movable electrode side terminal 72, respectively, and the outer periphery of the end of the vacuum valve 70 is It is configured to be covered with the fixed electrode side terminal 71 and the movable electrode side terminal 72. With this configuration, the vacuum circuit breaker greatly reduces the electric field concentration at the end of the vacuum valve 70, which has a junction between the ceramic cylinder and the metal end plate. Can be obtained.

As described above, the vacuum circuit breaker of the present invention comprises: a base which is airtightly attached to the container wall as a part of the container wall of the gas insulated switchgear; a pair of insulating supports provided on the base; A vacuum valve having an electrode side terminal and a movable electrode side terminal, the both terminal portions being supported by the insulating support, and being attached to the base; an operation mechanism provided on the base; An operation link mechanism connected between the movable electrode side terminal of the vacuum valve and the operation link mechanism for opening and closing the vacuum valve, wherein the operation link mechanism extends through the insulating support. And a vacuum circuit breaker covered by the insulating support. Therefore, the size of the vacuum circuit breaker can be reduced, and the space insulation distance between the vacuum circuit breaker and peripheral devices can be reduced. Industrial applicability

INDUSTRIAL APPLICABILITY As described above, the vacuum circuit breaker according to the present invention is useful as a vacuum circuit breaker particularly suitable for use in a switchboard for power switching control using a gas-insulated switchgear.

Claims

The scope of the claims

1. A base that is hermetically attached to the main container as part of the main container of the gas insulated switchgear,

A pair of insulating support members provided on the base; a fixed electrode side terminal and a movable electrode side terminal; both terminal portions are supported by the insulating support body and attached to the base; A vacuum valve,

An operation mechanism provided on the base,

A vacuum circuit breaker comprising: an operation link mechanism connected between the operation mechanism and the movable electrode side terminal of the vacuum valve to open and close the vacuum valve.

A vacuum circuit breaker, wherein the operation link mechanism extends through the insulating support and is covered by the insulating support.

2. The vacuum circuit breaker according to claim 1, wherein the fixed electrode side terminal and the movable electrode side terminal of the vacuum valve include a connector that can be connected to a main circuit conductor of a gas insulated switchgear.

3. The vacuum circuit breaker according to claim 1, wherein each of the fixed electrode side terminal and the movable electrode side terminal is provided with an electric field relaxation case.

4. a base; a vacuum valve disposed on one side of the base;

A fixed-side terminal conductor connected to the fixed electrode side of the vacuum valve,

A contact opening / closing link mechanism connected to the movable electrode side of the vacuum valve,

A movable terminal conductor connected to the movable electrode side of the vacuum valve;

A pair of insulating supports that stand on the base plate to support the fixed-side terminal conductor and the movable-side terminal conductor, respectively; An operating mechanism mounted on the opposite side to the vacuum valve with the base interposed therebetween; and a drive arranged inside the insulating support along the supporting direction to connect and drive the operating mechanism and the contact opening / closing link mechanism. Vacuum circuit breaker comprising:

5. The fixed-side terminal conductor is in contact with a fixed-electrode-side terminal of the vacuum valve, and supports a vacuum valve; an enclosing portion that supports the supporting portion and surrounds the container in an open container shape; 5. The vacuum circuit breaker according to claim 4, further comprising a connection terminal that comes into contact with and separates from the main circuit.

6. The movable terminal conductor surrounds a contact opening / closing link mechanism connected to the movable electrode side of the vacuum valve in an open container shape, and includes a connection terminal that comes in contact with and separates from another main circuit. The vacuum circuit breaker according to claim 4.

7. The vacuum circuit breaker according to claim 5, wherein the outer peripheral surfaces of the fixed-side terminal conductor and the movable-side terminal conductor are curved surfaces connecting different planes with curved surfaces.

8. The vacuum circuit breaker according to claim 7, wherein outer diameter portions at both ends of the cylindrical portion of the vacuum valve are covered with a fixed-side terminal conductor and a movable-side terminal conductor.

9. The vacuum circuit breaker according to claim 4, wherein the base forms a part of a main container of a gas insulated switchgear.

10. The vacuum circuit breaker according to claim 6, wherein the contact opening / closing link mechanism is a contact pressure link mechanism supported by a movable terminal conductor.

11. The insulating support for supporting the movable-side terminal conductor has a hollow cylindrical shape, and a driving member for connecting and driving an operation mechanism and a contact opening / closing link mechanism is disposed inside the hollow support. 5. The vacuum circuit breaker according to claim 4, wherein:

1 2. An airtight chamber communicating with the hollow hole of the insulating support that supports the movable-side terminal conductor is provided on the operation mechanism mounting side of the base, and a drive member that connects the operation mechanism and the contact opening / closing link mechanism is provided therein. 12. The vacuum circuit breaker according to claim 11, wherein a lever shaft connected to the operation mechanism is disposed while being connected and driven and one end of the operation rod penetrates a wall of the airtight chamber.