JP7362007B1 - switchgear - Google Patents

Abstract

The switchgear includes a link mechanism (60) fixed to a vacuum valve (40) electrically connected to a first conductor (10), and a one-way rotation transmission member (80) attached to the link mechanism (60). ), a fixed contact (31) electrically connected to the first conductor (10), and a movable contact (32) electrically connected to the second conductor (20) and having a hook portion (322). The link mechanism (60) includes a first link member (61), a second link member (62) rotatably fixed to the first link member (61), and one end (631). ) is rotatably fixed to the second link member (62), and a third link member (63) whose other end (632) is rotatably fixed to the movable electrode (43), The one-way rotation transmission member (80) is electrically connected to the movable electrode (43), and is rotatably fixed to the second link member (62) to move the hook portion (322). placed above.

Description

The present disclosure relates to a switchgear that interrupts electric current within a container filled with insulating gas.

BACKGROUND ART Switching devices such as disconnectors and grounding switches used in gas-insulated switchgear have a structure in which opening and closing operations are performed by linearly or rotationally driving movable contacts.

Switchgears used in gas-insulated switchgears that use dry air as an insulating medium have a shorter arc generation time when interrupting current during an opening operation, compared to switchgears used in gas-insulated switchgears that use _SF6 gas as an insulating medium. Also, since the arc distance becomes longer, the equipment becomes larger.

In the field of excitation current switching disconnectors used in pneumatic interrupters or compact power receiving and substation equipment, a vacuum valve is installed in parallel with the disconnector as a countermeasure against arcing, as in the interrupter disclosed in Patent Document 1. A structure may be used to cut off the current between the electrodes of the vacuum valve.

Special Publication No. 48-18311

If a vacuum valve is installed in parallel with the disconnecting section as a countermeasure against arcing, the structure of the switching device becomes complicated because it is necessary to open and close the valve at two locations: the disconnecting section and the electrode of the vacuum valve.

Furthermore, if a vacuum valve is installed in parallel with the disconnection section, a voltage is constantly applied to the electrodes of the vacuum valve when the connection is opened. Therefore, if a vacuum valve is installed in parallel with the disconnection section, it is necessary to use a large vacuum valve in order to withstand the voltage load.

Due to the above-mentioned causes, a switchgear in which a vacuum valve is installed in parallel with a disconnection section to prevent arcing has a problem in that it leads to a complicated device configuration and an increase in the size of the device.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a switchgear in which an arc can be extinguished by a vacuum valve, and in which the complexity of the device configuration and the increase in size of the device are suppressed.

In order to solve the above-mentioned problems and achieve the objective, a switchgear according to the present disclosure is a switchgear that opens and closes an electric circuit in a tank filled with an insulating gas, and includes a first conductor and a second conductor. a fixed contact electrically connected to the first conductor, a vacuum valve electrically connected to the first conductor, a linkage fixed to the vacuum valve, and a one-way attached to the linkage. It includes a rotation transmission member and a movable contact that is electrically connected to the second conductor and that moves linearly between a closed position in which it contacts the fixed contact and an open position that is separated from the fixed contact. The vacuum valve includes a cylindrical vacuum container, a fixed electrode installed inside the vacuum container and electrically connected to a first conductor, and installed opposite to the fixed electrode inside the vacuum container. It has a movable side electrode and a bellows that connects the movable side electrode and the vacuum vessel. The link mechanism includes a first link member fixed to the vacuum valve, a second link member having one end rotatably fixed to the first link member, and an intermediate portion of the second link member having one end. and a third link member whose other end is rotatably fixed to the movable electrode. The movable contact has a contact portion that contacts the fixed contact in the closing position, and a hook-shaped hook portion. The one-way rotation transmission member is rotatably fixed to the other end of the second link member and is disposed on the movement locus of the contact part, and in the opening operation in which the movable contact moves from the closing position to the opening position. In the closing operation in which the second link member is rotated around one end of the second link member by the force received from the hook portion, and the movable contact moves from the open position to the closing position, the force received from the hook portion is rotated by the second link member. It is not transmitted to the second link member.

According to the switchgear according to the present disclosure, it is possible to extinguish the arc using the vacuum valve, and it is possible to suppress the complexity of the device configuration and the increase in size of the device.

A diagram showing the configuration of a switchgear according to Embodiment 1 Enlarged view of the vacuum valve, link mechanism, one-way rotation transmission member, spring member, and link mechanism frame of the opening/closing device according to Embodiment 1 Enlarged view of the vacuum valve, link mechanism, one-way rotation transmission member, spring member, and link mechanism frame of the opening/closing device according to Embodiment 1 A diagram showing a state in which the hook portion is in contact with the one-way rotation transmission member during the opening operation of the opening/closing device according to the first embodiment A diagram showing a state in which the contact portion of the movable contact has come out of the hole of the fixed contact during the opening operation of the switchgear according to Embodiment 1. A diagram showing a state in which the hook portion of the movable contact has passed through the link mechanism frame during the opening operation of the opening/closing device according to Embodiment 1. A diagram showing a state in which the hook portion is in contact with the unidirectional rotation transmission member during the closing operation of the opening/closing device according to Embodiment 1. Enlarged view of the disconnection section, vacuum valve, link mechanism, unidirectional rotation transmission member, spring member, and link mechanism frame of the switchgear according to Embodiment 2 A diagram showing the configuration of a switchgear according to Embodiment 3 Enlarged view of the disconnection section, vacuum valve, link mechanism, one-way rotation transmission member, spring member, and link mechanism frame of the switchgear according to Embodiment 3 A diagram showing a state in which the hook portion is in contact with the unidirectional rotation transmission member during the opening operation of the opening/closing device according to Embodiment 3 A diagram showing a state in which the hook portion is biased in the direction of pressing the unidirectional rotation transmission member against the stopper during the opening operation of the opening/closing device according to Embodiment 3. A diagram showing a state in which the hook part has come out of the link mechanism frame during the opening operation of the opening/closing device according to Embodiment 3. A diagram showing a state in which the hook portion is in contact with the unidirectional rotation transmission member during the closing operation of the opening/closing device according to Embodiment 3. Enlarged view of the disconnection section, vacuum valve, link mechanism, one-way rotation transmission member, spring member, and link mechanism frame of the switchgear according to Embodiment 4

Below, a switchgear according to an embodiment will be described in detail based on the drawings.

Embodiment 1.
FIG. 1 is a diagram showing the configuration of a switchgear according to a first embodiment. A disconnector 100, which is a switchgear according to the first embodiment, includes a tank 50 filled with an insulating gas, and a first conductor 10 and a second conductor 20 arranged inside the tank 50. Further, the disconnector 100 includes a disconnector 30 including a fixed contact 31 and a movable contact 32, and a vacuum valve 40 for cutting off current. The disconnector 100 also includes a link mechanism 60 installed at the end of the vacuum valve 40 opposite to the side fixed to the first conductor 10, and a link mechanism frame 70 that covers the link mechanism 60. . Movable contact 32 is fixed to second conductor 20 . The fixed contact 31 has a hole 311 formed in the surface facing the movable contact 32. The movable contact 32 moves linearly by receiving a driving force from an operating device (not shown). The movable contact 32 includes a contact portion 321 that can be inserted into the hole 311 of the fixed contact 31, and a hook portion 322 arranged in parallel with the contact portion 321, and has a bifurcated tip. In addition, although the movable contact 32 with a forked tip is taken as an example and explained here, the movable contact 32 only needs to include a contact portion 321 and a hook portion 322, and the movable contact 32 may have a bifurcated tip. It is not limited to.

The disconnector 100 is incorporated into a gas-insulated switchgear 300 and separated from other devices by an insulating spacer 200.

The disconnector 100 shown in FIG. 1 is in a closed state in which the movable contact 32 is in contact with the fixed contact 31, and current flows between the first conductor 10 and the second conductor 20 through the movable contact 32 and the fixed contact 31. . When the movable contact 32 separates from the fixed contact 31 due to a driving force from an operating device (not shown) and no current flows between the first conductor 10 and the second conductor 20, the disconnector 100 becomes open. Hereinafter, the operation of transitioning from the closing state to the open state will be referred to as the opening operation, and the operation of transitioning from the open state to the closing state will be referred to as the closing operation.

2 and 3 are enlarged views of a vacuum valve, a link mechanism, a one-way rotation transmission member, a spring member, and a link mechanism frame of the opening/closing device according to the first embodiment. FIG. 3 shows the vacuum valve 40, link mechanism 60, one-way rotation transmission member 80, spring member 90, and link mechanism frame 70 as viewed from the direction of arrow A in FIG. The vacuum valve 40 includes a cylindrical vacuum container 41, a fixed electrode 42 installed inside the vacuum container 41, and a movable electrode 43 installed inside the vacuum container 41 facing the fixed electrode 42. , a bellows portion 44 connecting the movable electrode 43 and the vacuum container 41. The fixed electrode 42 includes a fixed electrode rod 421 extending in a rod shape from one end 411 of the vacuum container 41, and a fixed contact 422 provided at one end 421a of the fixed electrode rod 421. The movable electrode 43 includes a movable electrode rod 431 that penetrates through the other end 412 of the vacuum vessel 41 and extends to the outside of the vacuum vessel 41, and a movable contact 432 provided at one end 431a of the movable electrode rod 431. The bellows portion 44 includes an end plate 441 fixed to the movable electrode rod 431 and a bellows 442 connecting the other end 412 of the vacuum container 41 and the end plate 441. The other end 421b of the fixed electrode rod 421 is connected to the first conductor 10. The other end 431b of the movable electrode rod 431 is connected to the link mechanism 60 outside the vacuum container 41.

The link mechanism 60 includes a first link member 61 fixed to the other end 412 of the vacuum container 41, a second link member 62 whose one end 621 is rotatably fixed to the first link member 61, and one end. The third link member 63 is rotatably fixed to an intermediate portion 624 between one end 621 and the other end 622 of the second link member 62 . The link mechanism 60 includes a one-way rotation transmission member 80 rotatably fixed to the other end 622 of the second link member 62, and a spring that connects the second link member 62 and the one-way rotation transmission member 80. A member 90 is installed. The other end 632 of the third link member 63 is rotatably fixed to the other end 431b of the movable electrode rod 431. A stopper 623 that restricts the rotation of the one-way rotation transmission member 80 is formed on the other end 622 of the second link member 62, and the one-way rotation transmission member 80 can only rotate to a position where it hits the stopper 623. It looks like this. The spring member 90 biases the one-way rotation transmission member 80 in the direction of abutting against the stopper 623 by its elastic force. The second link member 62, the third link member 63, and the one-way rotation transmission member 80 are made of a conductive material. Therefore, the movable side electrode 43 and the one-way rotation transmission member 80 are electrically connected by the third link member 63 and the second link member 62. The one-way rotation transmission member 80 is arranged on the movement locus of the hook portion 322.

The link mechanism 60, the one-way rotation transmission member 80, and the spring member 90 are covered by a dome-shaped link mechanism frame 70. The link mechanism frame 70 is made of a conductive material and shields the link mechanism 60, the one-way rotation transmission member 80, and the spring member 90 from the electric field within the tank 50. A gap 71 is formed in the link mechanism frame 70, through which the hook portion 322 can pass.

When no external force is applied to the link mechanism 60, the bellows 442 expands due to the pressure of the insulating gas in the tank 50, and the movable contact 432 is in contact with the fixed contact 422.

The opening operation will be explained. When the movable contact 32 receives a driving force from an operating device (not shown) and moves away from the fixed contact 31, the hook portion 322 passes through the gap 71 of the link mechanism frame 70 and is disposed inside the link mechanism frame 70. The one-way rotation transmission member 80 is contacted. FIG. 4 is a diagram showing a state in which the hook portion is in contact with the one-way rotation transmission member during the opening operation of the opening/closing device according to the first embodiment. At the time when the hook portion 322 contacts the unidirectional rotation transmission member 80, the contact portion 321 has not come out of the hole 311 of the fixed contact 31, and there is no fixed contact between the first conductor 10 and the second conductor 20. Current flows through both the path through the contact 31 and the contact portion 321 and the path through the vacuum valve 40, the link mechanism 60, the one-way rotation transmission member 80, and the hook portion 322.

FIG. 5 is a diagram showing a state in which the contact portion of the movable contact has come out of the hole of the fixed contact during the opening operation of the switchgear according to the first embodiment. As the movable contact 32 further moves away from the fixed contact 31, the contact portion 321 comes out of the hole 311 of the fixed contact 31, and the hook portion 322 moves in the direction of pressing the one-way rotation transmission member 80 against the stopper 623. energize. When the contact part 321 comes out of the hole 311 of the fixed contact 31, the vacuum valve 40, the link mechanism 60, the one-way rotation transmission member 80, and the hook part 322 are disposed between the first conductor 10 and the second conductor 20. Current flows only through the path. By pressing the one-way rotation transmission member 80 against the stopper 623, the second link member 62 rotates around the portion rotatably fixed to the first link member 61. As the second link member 62 rotates, the third link member 63 moves in the direction of pulling the movable electrode rod 431 out of the vacuum container 41, and the movable contact 432 separates from the fixed contact 422. When the movable contact 432 separates from the fixed contact 422, the current between the first conductor 10 and the second conductor 20 is interrupted. When the movable electrode rod 431 moves in the direction of being pulled out from the vacuum container 41, the bellows 442 is compressed.

FIG. 6 is a diagram showing a state in which the hook portion of the movable contact has passed through the link mechanism frame during the opening operation of the opening/closing device according to the first embodiment. When the hook portion 322 separates from the one-way rotation transmission member 80, no external force is applied to the link mechanism 60. As the external force applied to the link mechanism 60 disappears, the bellows 442 that was compressed during the opening operation expands due to the pressure of the gas in the tank 50, and the movable electrode rod 431 pulled out from the vacuum container 41 moves into the vacuum container. I am drawn into the interior of 41. When the movable electrode rod 431 is drawn into the vacuum container 41, the third link member 63 rotates the second link member 62 and returns to the position before the hook portion 322 contacts the one-way rotation transmission member 80. Return. When the movable contact 432 contacts the fixed contact 422, the movable contact 432 and the fixed contact 422 have the same potential.

Next, the charging operation will be explained. FIG. 7 is a diagram showing a state in which the hook portion is in contact with the one-way rotation transmission member during the closing operation of the opening/closing device according to the first embodiment. When the movable contact 32 moves toward the fixed contact 31 by a driving force from an operating device (not shown), the hook portion 322 passes through the gap 71 of the link mechanism frame 70 and is installed inside the link mechanism frame 70. It contacts the one-way rotation transmission member 80 . In the closing operation, the hook portion 322 contacts the one-way rotation transmission member 80 from the opposite direction to the opening operation. In the closing operation, the one-way rotation transmission member 80 does not abut against the stopper 623, so the one-way rotation transmission member 80 does not transmit rotational force to the second link member 62.

As the movable contact 32 moves toward the fixed contact 31, the contact portion 321 is inserted into the hole 311 of the fixed contact 31. By inserting the contact portion 321 into the hole 311 of the fixed contact 31, a current flows between the first conductor 10 and the second conductor 20 through the contact portion 321 and the fixed contact 31.

When the hook portion 322 passes through the link mechanism frame 70, the one-way rotation transmission member 80 is returned to the position where it contacts the stopper 623 by the elastic force of the spring member 90.

The disconnector 100, which is a switchgear according to the first embodiment, includes a first link member 61 fixed to the other end 412 of the vacuum container 41, and one end 621 rotatably fixed to the first link member 61. and a third link member 63 whose one end 631 is rotatably fixed to an intermediate portion 624 between one end 621 and the other end 622 of the second link member 62. Therefore, the vacuum valve 40 can be opened using the driving force applied to the movable contact 32, and the vacuum valve 40 can be closed using the pressure of the insulating gas in the tank 50. Therefore, there is no need for a mechanism for transmitting driving force from the operating device for the vacuum valve 40, which is separate from the operating device for opening and closing the disconnection section 30, to the vacuum valve 40, and the device configuration can be simplified. In addition, in the open state, the movable contact 432 and the fixed contact 422 of the vacuum valve 40 are in contact and have the same potential, and no voltage is applied between them, so it is necessary to use a large vacuum valve 40. This allows the device to be made smaller.

Embodiment 2.
FIG. 8 is an enlarged view of a disconnection section, a vacuum valve, a link mechanism, a one-way rotation transmission member, a spring member, and a link mechanism frame of the opening/closing device according to the second embodiment. The disconnector 100, which is a switchgear according to the second embodiment, includes a flexible conductor 91 that electrically connects the movable electrode rod 431 and the unidirectional rotation transmission member 80. In the disconnector 100 according to the second embodiment, the second link member 62 and the third link member 63 are formed of an insulating material. That is, in the disconnector 100 according to the second embodiment, the entire link mechanism 60 is formed of an insulating material. Other than this, the disconnector 100 is the same as the disconnector 100 according to the first embodiment.

In the disconnector 100 according to the second embodiment, since the entire link mechanism 60 is formed of an insulating material, it is possible to prevent conductive wear particles from being generated due to friction during the operation of the link mechanism 60.

Similarly to the disconnector 100 according to the first embodiment, the disconnector 100 according to the second embodiment is connected to the vacuum valve 40 from an operation device for the vacuum valve 40 that is different from the operation device for opening and closing the disconnection section 30. A mechanism for transmitting driving force is not required, and the device configuration can be simplified. In addition, in the open state, the movable contact 432 and the fixed contact 422 of the vacuum valve 40 are in contact and have the same potential, and no voltage is applied between them, so it is necessary to use a large vacuum valve 40. This allows the device to be made smaller.

Embodiment 3.
FIG. 9 is a diagram showing the configuration of the opening/closing device according to the third embodiment. FIG. 10 is an enlarged view of a disconnection section, a vacuum valve, a link mechanism, a one-way rotation transmission member, a spring member, and a link mechanism frame of the opening/closing device according to the third embodiment. In the disconnector 100, which is the opening/closing device according to the third embodiment, the link mechanism frame 70 covers the entire vacuum valve 40 in addition to the link mechanism 60, the one-way rotation transmission member 80, and the spring member 90. A hole 72 is formed in the link mechanism frame 70, and a tulip-shaped fixed contact 31 is installed at the edge of the hole 72. The fixed contact 31 is electrically connected to the first conductor 10 through the link mechanism frame 70. The hook portion 322 of the movable contact 32 is installed at the tip of the round bar-shaped contact portion 321. Other than this, the disconnector 100 is the same as the disconnector 100 according to the first embodiment.

The opening operation will be explained. When the movable contact 32 receives a driving force from an operating device (not shown) and moves in the direction in which the contact portion 321 comes out of the fixed contact 31, the hook portion 322 is connected to the one-way rotation transmission mechanism installed inside the link mechanism frame 70. Contact member 80. FIG. 11 is a diagram showing a state in which the hook portion is in contact with the one-way rotation transmission member during the opening operation of the opening/closing device according to the third embodiment. When the hook portion 322 contacts the unidirectional rotation transmission member 80, the contact portion 321 is in contact with the fixed contact 31, and the fixed contact 31 and the fixed contact 31 are connected between the first conductor 10 and the second conductor 20. Current flows through both the path through the contact portion 321 and the path through the vacuum valve 40, the link mechanism 60, the one-way rotation transmission member 80, the hook portion 322, and the contact portion 321.

As the movable contact 32 further moves in the direction in which the contact part 321 comes out of the fixed contact 31, the contact part 321 comes out of the fixed contact 31, and the hook part 322 pushes the unidirectional rotation transmission member 80 against the stopper 623. to energize. FIG. 12 is a diagram showing a state in which the hook portion is biased in the direction of pressing the one-way rotation transmission member against the stopper during the opening operation of the opening/closing device according to the third embodiment. By removing the contact portion 321 from the fixed contact 31, the vacuum valve 40, the link mechanism 60, the one-way rotation transmission member 80, the hook portion 322, and the contact portion are disposed between the first conductor 10 and the second conductor 20. Current flows only through the path through 321. By pressing the one-way rotation transmission member 80 against the stopper 623, the second link member 62 rotates around the portion rotatably fixed to the first link member 61. As the second link member 62 rotates, the third link member 63 moves in a direction to pull out the movable electrode rod 431 from the vacuum container 41, and the movable contact 432 separates from the fixed contact 422. When the movable contact 432 separates from the fixed contact 422, the current between the first conductor 10 and the second conductor 20 is interrupted.

FIG. 13 is a diagram showing a state in which the hook portion has come out of the link mechanism frame during the opening operation of the opening/closing device according to the third embodiment. When the hook portion 322 separates from the one-way rotation transmission member 80, no external force is applied to the link mechanism 60. As the external force applied to the link mechanism 60 disappears, the bellows 442 that was compressed during the opening operation expands due to the pressure of the gas in the tank 50, and the movable electrode rod 431 pulled out from the vacuum container 41 moves into the vacuum container. I am drawn into the interior of 41. When the movable electrode rod 431 is drawn into the vacuum container 41, the third link member 63 rotates the second link member 62 and returns to the position before the hook portion 322 contacts the one-way rotation transmission member 80. Return. When the movable contact 432 contacts the fixed contact 422, the movable contact 432 and the fixed contact 422 have the same potential.

Next, the charging operation will be explained. The movable contact 32 moves toward the fixed contact 31 by a driving force from an operating device (not shown). FIG. 14 is a diagram showing a state in which the hook portion is in contact with the one-way rotation transmission member during the closing operation of the opening/closing device according to the third embodiment. The hook portion 322 enters the inside of the link mechanism frame 70 through the hole 72 of the link mechanism frame 70 and comes into contact with the one-way rotation transmission member 80 installed inside the link mechanism frame 70. In the closing operation, the hook portion 322 contacts the one-way rotation transmission member 80 from the opposite direction to the opening operation. In the closing operation, the one-way rotation transmission member 80 does not abut against the stopper 623, so the one-way rotation transmission member 80 does not transmit rotational force to the second link member 62.

By moving the movable contact 32 toward the fixed contact 31, the contact portion 321 is inserted into the fixed contact 31. By inserting the contact portion 321 into the fixed contact 31, a current flows between the first conductor 10 and the second conductor 20 through the contact portion 321 and the fixed contact 31. The one-way rotation transmission member 80 is returned to the position where it contacts the stopper 623 by the elastic force of the spring member 90.

Similarly to the disconnecting switch 100 according to the first and second embodiments, the disconnecting switch 100 according to the third embodiment is configured to operate a vacuum valve from an operating device for the vacuum valve 40, which is separate from the operating device for opening and closing the disconnecting section 30. There is no need for a mechanism for transmitting driving force to 40, and the device configuration can be simplified. In addition, in the open state, the movable contact 432 and the fixed contact 422 of the vacuum valve 40 are in contact and have the same potential, and no voltage is applied between them, so it is necessary to use a large vacuum valve 40. This allows the device to be made smaller.

Embodiment 4.
FIG. 15 is an enlarged view of a disconnection section, a vacuum valve, a link mechanism, a one-way rotation transmission member, a spring member, and a link mechanism frame of the opening/closing device according to the fourth embodiment. Disconnector 100, which is a switchgear according to Embodiment 4, includes a flexible conductor 91 that electrically connects movable electrode rod 431 and unidirectional rotation transmission member 80. In the disconnector 100 according to the fourth embodiment, the second link member 62 and the third link member 63 are made of an insulating material. That is, in the disconnector 100 according to the fourth embodiment, the entire link mechanism 60 is formed of an insulating material. Other aspects are the same as the disconnector 100 according to the third embodiment.

In the disconnector 100 according to the fourth embodiment, since the entire link mechanism 60 is formed of an insulating material, generation of conductive abrasion powder due to friction during operation of the link mechanism 60 can be prevented.

Similarly to the disconnector 100 according to the first, second, and third embodiments, the disconnector 100 according to the fourth embodiment is connected to an operating device for the vacuum valve 40 that is separate from the operating device for opening and closing the disconnecting section 30. A mechanism for transmitting driving force to the vacuum valve 40 is not required, and the device configuration can be simplified. In addition, in the open state, the movable contact 432 and the fixed contact 422 of the vacuum valve 40 are in contact and have the same potential, and no voltage is applied between them, so it is necessary to use a large vacuum valve 40. This allows the device to be made smaller.

Note that the switchgear according to Embodiments 1, 2, 3, and 4 can also be implemented as a grounding switch by making the movable contact 32 movable to the grounding position where the movable contact 32 is grounded. .

The configuration shown in the above embodiments shows an example of the content, and it is also possible to combine it with another known technology, or a part of the configuration can be omitted or changed without departing from the gist. It is also possible.

Reference Signs List 10 first conductor, 20 second conductor, 30 disconnection section, 31 fixed contact, 32 movable contact, 40 vacuum valve, 41 vacuum container, 42 fixed electrode, 43 movable electrode, 44 bellows section, 50 tank, 60 Link mechanism, 61 First link member, 62 Second link member, 63 Third link member, 70 Link mechanism frame, 71 Gap, 72, 311 Hole, 80 One-way rotation transmission member, 90 Spring member, 91 Possible Flexible conductor, 100 Disconnector, 200 Insulating spacer, 300 Gas insulated switchgear, 321 Contact part, 322 Hook part, 411, 421a, 431a one end, 412, 421b, 431b other end, 421 Fixed side electrode rod, 422 Fixed side Contact, 431 Movable electrode rod, 432 Movable contact, 441 End plate, 442 Bellows, 621, 631 One end, 622, 632 Other end, 623 Stopper, 624 Intermediate part.

Claims (8)

A switchgear that opens and closes an electric circuit in a tank filled with insulating gas,
a first conductor and a second conductor;
a fixed contact electrically connected to the first conductor;
a vacuum valve electrically connected to the first conductor;
a linkage mechanism fixed to the vacuum valve;
a one-way rotation transmission member attached to the link mechanism;
a movable contact that is electrically connected to the second conductor and that moves linearly between a closing position in which it contacts the fixed contact and an open position away from the fixed contact;
The vacuum valve is
a cylindrical vacuum container; a fixed electrode installed inside the vacuum container and electrically connected to the first conductor; and a fixed electrode installed inside the vacuum container to face the fixed electrode. It has a movable side electrode and a bellows connecting the movable side electrode and the vacuum container,
The link mechanism is
a first link member fixed to the vacuum valve;
a second link member having one end rotatably fixed to the first link member;
a third link member, one end of which is rotatably fixed to the intermediate portion of the second link member, and the other end of which is rotatably fixed to the movable electrode;
The movable contact is
a contact portion that contacts the fixed contact in the closing position;
It has a hook-shaped hook part,
The one-way rotation transmission member is rotatably fixed to the other end of the second link member and disposed on the movement locus of the contact portion, and the movable contact moves from the closed position to the open position. In the moving opening operation, the second link member is rotated around one end of the second link member by the force received from the hook portion, and the movable contact moves from the open position to the closing position. An opening/closing device characterized in that in a closing operation, the force received from the hook portion is not transmitted to the second link member. The opening/closing device according to claim 1, wherein the second link member includes a stopper that comes into contact with the one-way rotation transmission member to restrict rotation of the one-way rotation transmission member during the opening operation. Device. 3. The opening/closing device according to claim 2, further comprising a spring member in the tank that biases the one-way rotation transmission member in a direction to press the stopper. The opening/closing device according to claim 1, wherein the second link member and the third link member are made of a conductive material. The switchgear according to claim 1, further comprising a flexible conductor in the tank that connects the movable side electrode and the one-way rotation transmission member. The switchgear according to claim 1, wherein the bellows is expanded by the pressure of the insulating gas when no external force is applied to the link mechanism, and brings the movable electrode into contact with the fixed electrode. . The opening/closing device according to any one of claims 1 to 6, wherein the hook portion and the contact portion are arranged side by side in a direction perpendicular to a direction of linear movement of the movable contact. The opening/closing device according to any one of claims 1 to 6, wherein the hook portion and the contact portion are arranged along a direction of linear movement of the movable contact.

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