WO2019123615A1

WO2019123615A1 - Switchgear

Info

Publication number: WO2019123615A1
Application number: PCT/JP2017/045983
Authority: WO
Inventors: 安部　淳一; 吉田　忠広; 慎太郎山田
Original assignee: 三菱電機株式会社
Priority date: 2017-12-21
Filing date: 2017-12-21
Publication date: 2019-06-27
Also published as: JP6452901B1; JPWO2019123615A1

Abstract

The purpose of the present invention is to provide a structure of a drive device of a switchgear, said structure being resistant to the effects of an installation environment and facilitating inspection. The drive device (6a) drives, through a coupling portion (3a) having the airtightness of the inside of a pressure tank (11b), a movable side conductor (21) having a movable contact (23) provided so as to be capable of being brought into contact with or separated from a fixed contact (22), and is covered with an airtight case (4) having an observation window (5) outside the pressure tank (11b), thereby preventing dust generation and facilitating inspection. An anti-vibration member (7) is also disposed in a connection portion (17) between the case (4) and the pressure tank (11b) to suppress the propagation of vibrations from the drive device (6a) to the observation window (5) when the drive device (6a) is driven at high speed, preventing damage to the observation window (5).

Description

Switchgear

The present invention relates generally to a switchgear installed in a power transmission and distribution system, and more particularly to a drive apparatus for connecting and disconnecting contacts.

The contact / separation operation of the switchgear is connected to the fixed contact provided at the end of the fixed conductor via the insulating rod at the one end to the movable contact having the movable contact provided at one end so as to be contactable with the fixed contact. This is done by driving the operating rod. The operation rod is driven by a spring drive device utilizing spring energy stored by an electric motor, an electromagnetic drive device driving an iron mover, etc. by an electromagnetic force generated by a coil energized with current.

Switchgears for connecting and disconnecting circuits installed in electric power systems are often installed outdoors or in a polluting atmosphere, and there is a concern about deterioration due to adhesion of dust or rusting, and in particular, in the drive device, periodical Maintenance, cleaning, grease up, overhaul etc.
In addition, foreign matter is mixed in the operating rod serving as the driving shaft and the periphery thereof, or the member related to the driving of the operating rod or the like is rusted by moisture or the like, which may cause problems in the switching electrode operation.

On the other hand, in order to improve the reliability of the drive device, the drive device disposed in connection with the pressure tank is accommodated in the pressure tank with respect to the pressure tank in which the fixed contacts and the movable contacts are accommodated and the insulating gas is filled. Patent Document 1 discloses a structure having an operation box for sealing at a pressure lower than
Moreover, the structure which covers a drive device with a cover is also disclosed (patent document 2).

Patent No. 5183831 International Publication No. 2011/052288

In the conventional opening / closing device, the drive device may require periodic or irregular maintenance because it has a pivoting portion and a sliding portion. In this case, it takes a lot of time and money to check the power and stop the power failure.
Further, in Patent Document 1 and Patent Document 2, the entire drive device is covered with a case, so it is difficult to receive the installation environment of the opening and closing device, but it is necessary to remove the case and perform visual inspection. At that time, in Patent Document 1, since it is in communication with the main circuit in the pressure tank, a power failure is required, and depending on the gas type in the tank, it is not necessary to recover the gas and refill it again. It will be necessary. In addition, the case may be affected by humidity and dust during the opening of the case, which may cause rusting and an increase in the frictional force of the drive unit.

If the viewing window for the pressure tank shown in FIG. 2 of Patent Document 2 is provided in the operation box of Patent Document 1, the inside of the drive unit can be inspected without opening the operation box to the atmosphere. However, since the operation of the drive device for bringing the contacts into and out of contact gives an impact to the operation device itself, there is a possibility that the viewing window may be broken.

The present invention has been made to solve the above-mentioned problems, and has an object of providing a switching device which shuts off the driving device of the switching device from the external environment and facilitates inspection of the driving device.

The switchgear according to the present invention drives a movable side conductor having a fixed side conductor provided with a fixed contact at an end, a movable contact provided at one end at one end so as to be able to contact or separate from the fixed contact, An open / close device comprising a drive device, wherein the drive device is covered with an airtight case having a viewing window, and is connected airtightly to an insulating rod connected to the other end of the movable side conductor It is connected to the said movable side conductor through the part, and the anti-vibration member was provided between the said viewing window and the said drive device. It is characterized by the above-mentioned.

According to the opening and closing device of the present invention, by covering the drive device with a case to make it airtight, it is possible to prevent dust from entering the drive device, and it is possible to suppress an increase in the frictional force of the drive device.
Further, since the drive device can be visually checked by the viewing window provided in the case, it is not necessary to remove the case at the time of periodic inspection, and the inspection time can be shortened. Furthermore, since the anti-vibration member is interposed between the viewing window and the drive device, the propagation of the vibration to the viewing window can be prevented even if large vibrations occur due to the high speed operation of the drive device, and damage to the viewing window It can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the power receiving and transforming installation provided with the switchgear which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of a circuit breaker and its drive device among the switchgear which concern on Embodiment 1 of this invention. It is a figure which shows the state in which the drive device is covered by the case in FIG. It is a figure of the drive device of the switchgear which concerns on Embodiment 1 of this invention, and the other example which shows the peripheral part. It is a figure of the drive device of the switchgear which concerns on Embodiment 1 of this invention, and another example which shows the peripheral part. It is a figure which shows the drive device of the switching device which concerns on Embodiment 2 of this invention, and its periphery part. It is a figure which shows the drive device of the switching device which concerns on Embodiment 3 of this invention, and its periphery part. It is a figure which shows the drive device of the switching device which concerns on Embodiment 4 of this invention, and its periphery part. It is sectional drawing which shows the drive device of the switching device which concerns on Embodiment 5 of this invention, and its peripheral part. It is sectional drawing which shows the structure of the switch | opening-closing apparatus which concerns on Embodiment 6 of this invention, and its drive device. It is sectional drawing which shows the structure of the switch | opening-closing apparatus which concerns on Embodiment 7 of this invention, and its drive device. It is sectional drawing which shows the structure of the switch | opening-closing apparatus which concerns on Embodiment 8 of this invention, and its drive device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1
FIG. 1 is a diagram showing an entire configuration of a power receiving and transforming facility provided with a switchgear according to a first embodiment, and shows a configuration of a cubicle type power receiving and transforming facility 10 (hereinafter referred to as a cubicle) as an example.
In the figure, the cubicle 10 has

pressure tanks

11a and 11b electrically grounded, and the tank 12 is provided with a circuit breaker 12, a disconnect switch 13, a bus bar 14 and the like in the tank, and SF ₆ gas or Insulating gases such as dry air, N ₂ (nitrogen), and CO ₂ (carbon dioxide), which have a global warming potential of approximately zero and are effective for preventing global warming, are enclosed at high pressure.
The bus bar 14 in the upper tank 11a is connected to the conductor 16a in the lower pressure tank 11b via the disconnector 13 driven by the disconnector driving device 6b. The conductor 16 b connected to the device in the lower pressure tank 11 b is connected to an external power system via the cable 15.
In the pressure tank 11b, the vacuum valve 1 which comprises the circuit breaker 12 which is one of the switching devices is installed. The contacts in the vacuum valve 1 are brought into contact with or separated from each other by the breaker driving device 6a.

The cubicle 10 thus configured has, for example, a structure for drawing the power drawn from the cable 15 to the upper part in the pressure tank 11 a via the vacuum valve 1. When an electrical accident (ground fault or short circuit) occurs during normal current flow, interrupting the fault current that occurs with the vacuum valve 1 prevents the spread of the accident to the power system or peripheral devices.

FIG. 2 is a cross-sectional view showing a configuration of a circuit breaker and a drive device thereof in the switchgear according to Embodiment 1 of the present invention, and is a partial detailed view of FIG.
In the figure, the flange 17 is provided at the partition of the pressure tank 11b, and the inside of the pressure tank 11b is provided with the vacuum valve 1 constituting the circuit breaker 12.
The vacuum valve 1 includes a cylindrical fixed-side insulating cylinder 26a and a movable-side insulating cylinder 26b made of an insulating material such as ceramic, and a fixed side which is housed in the vacuum valve 1 and hermetically seals the fixed side of the vacuum valve 1 The fixed side conductor 20 joined to the end plate 25a, and the movable side end plate 25b, one end of which is provided so as to be able to contact with and separate from the fixed side conductor 20 and the other end hermetically seals the movable side end of the vacuum valve 1 The movable side conductor 21 extends outside the vacuum valve 1 through the bellows 24.
The vacuum valve 1 is mechanically held by the insulating support 28 while maintaining the insulation with the tank 11 b. The insulating support 28 is formed of an insulating resin.
The movable side conductor 21 extending out of the vacuum valve 1 is connected to the insulating rod 2, but the other end of the insulating rod 2 is connected to the operating rod 27, and the movable side conductor 21 and the operating rod 27 are electrically connected. Are connected to ensure an insulation distance that can be isolated.

The pressure tank 11b is provided with a driving device 6a for bringing the fixed contact 22 connected to the fixed side conductor 20 and the movable contact 23 connected to the movable side conductor 21 into and out of contact with each other. The driving device 6 a moves the movable side conductor 21 in the horizontal direction via the operation rod 27 and the insulating rod 2, thereby opening and closing the fixed contact 22 and the movable contact 23. At this time, since the bellows 24 follows the movement of the movable side conductor 21, the vacuum in the vacuum valve 1 is maintained.
In addition, the operation rod 27 is connected through the airtight connection portion (bellows) 3 a connected to the flange 17. The operating rod 27 passes through the flange 17 and is connected to and driven by the circuit breaker driving device 6a. Even if the operation rod 27 is driven, the airtightness of the pressure tank 11b is maintained by the bellows 3a.

The drive device 6a outside the pressure tank 11b is covered with the case 4, and the inside of the case 4 is made airtight by the flange 17 and the airtight member 8 (for example, an O-ring). Further, the case 4 and the flange 17 are connected via the vibration isolation member 7.
The vibration isolation member 7 may be made of a rubber member. As a kind of rubber used as the vibration proofing member 7, for example, natural rubber, nitrile rubber, chlorobrene rubber, butyl rubber or the like is used. The rubber is in the form of a sheet, and the center thereof is hollowed to match the opening of the flange 17.
The rubber vibration isolation member 7 is fixed by a bolt (not shown) that fixes the case 4 and the flange 17. In addition, the inside of the case 4 may be airtightly sealed by the anti-vibration member 7, or an elastic member such as a damper may be installed between the case 4 and the flange 17 as the anti-vibration member 7.
The wiring 18 connected to the driving device 6a for controlling and driving the driving device 6a is drawn out through the airtight member 8b provided in the case 4, and the control device of the opening / closing device or a power supply (not shown) Connected

As described above, the operation rod 27 is connected to the drive device 6a and the operation rod 27 is driven. However, even if the operation rod 27 is driven, the inside of the case 4 covering the drive device 6a is also airtight by the bellows 3a. Maintained.

FIG. 3 is a view showing the configuration of the circuit breaker and its drive device in the switchgear according to Embodiment 1 of the present invention, and is a view of the case 4 covering the drive device 6a of FIG. 2 viewed from the outside.
In the figure, a viewing window 5 is provided on the case 4 by providing a flange (not shown) at a position where the driving location of the driving device 6a and the open / close indication and the operation number meter (not shown) can be visually observed. There is.
By energizing the closing electrode coil 62 installed in the drive device 6 a, the mover 61 moves in the direction of the flange 17. Further, by energizing the opening coil 63, the mover 61 moves in the direction away from the flange 17. Although not shown in the drawings, a spring may be installed in the drive device 6a, and the open pole spring may be stored at the time of closing, and may be stored at the open pole. Although not shown, a permanent magnet may be installed for charging and holding, and energy may be obtained at the time of opening by energizing a coil that generates a magnetic flux in a direction that cancels the holding force of the permanent magnet at the time of opening. .
When the drive device 6a of FIG. 2 and FIG. 3 is compared, in FIG. 3, it can be seen that the mover 61 moves in the direction of the flange 17. At this time, the movable contact 23 and the fixed contact 22 are in contact in the vacuum valve 1, and the circuit breaker 12 is closed. By providing the viewing window 5 in this manner, the drive location of the drive device 6 a can be observed, and the open / close state of the circuit breaker 12 can be confirmed.

The circuit breaker is open in FIG. 2 and the circuit breaker is closed in FIG. 3, but the driver 6a opens and closes at high speed to interrupt the short circuit current in high voltage equipment and reduce the arcing time at the time of closing. Need to be implemented.
Therefore, a large vibration occurs when the drive device 6a operates. Therefore, it is necessary to provide an anti-vibration member for suppressing the propagation of the vibration from the driving device 6a to the viewing window 5. As in the present embodiment, by connecting the flange 17 and the case 4 via the vibration isolation member 7, it is possible to prevent the propagation of vibration to the case 4, and damage to the observation window 5 provided in the case 4. Can be prevented.

2 and 3 show an example in which a bellows 3a is used as the airtight connection member inside the pressure tank, but as shown in FIG. 4, an O-ring 3b is used as a seal material around the operation rod 27. It can also be provided. Further, as shown in FIG. 5, an airtight member 3c such as a T-ring or an X-ring may be used instead of the O-ring 3b.

As described above, according to the configuration of the first embodiment, by making the drive device 6a airtight with the case 4, it is possible to prevent dust from entering the drive device 6a, and the friction force of the drive device 6a It is possible to suppress the rise.
In addition, although the driving device is oxidized due to the increase in humidity of the surrounding atmosphere conventionally, the increase in the frictional force occurs, but this can also be suppressed.
Furthermore, since the drive device 6a can be visually confirmed by the viewing window 5 provided in the case 4, it is not necessary to remove the case at the time of periodic inspection, and the inspection time can be shortened. Large vibrations occur due to the high speed operation of the drive device 6a. However, by connecting the flange 17 and the case 4 via the vibration isolation member 7, the propagation of the vibrations to the case 4 and the viewing window 5 can be prevented. The breakage of the viewing window 5 provided in the case 4 can be prevented.

Second Embodiment
FIG. 6 is a diagram showing a drive device for a switchgear according to Embodiment 2 of the present invention and its periphery.
In the figure, the inside of the case 4 is made airtight by connecting it to the flange 17 via the airtight member 8a. The case 4 is provided with a gate valve 30 and a pressure gauge 31 for sealing the gas. A gas such as dry air (dry air), CO ₂ , N ₂ or the like is enclosed and filled in the airtight case 4 at, for example, the same or higher pressure than the atmospheric pressure. In order to seal the gas at a pressure higher than the atmospheric pressure, the case 4 is made of a member (for example, stainless steel of a predetermined thickness) having a strength sufficient to withstand the pressure difference with the atmospheric pressure.
The other configuration is the same as that of FIG. 4 of the first embodiment, but the airtight member (O-ring) 3b may be another airtight member, a bellows or the like described in the first embodiment.

If the outside air flows into the case 4, there is a possibility that the friction of the drive device 6a may rise due to rusting of the drive device 6a due to the humidity increase in the case 4 or the inflow of dust and the like in the air.
Therefore, by making the inside of the case 4 airtight with a gas higher than the atmospheric pressure, it is possible to easily determine the gas leakage by monitoring the pressure in the case 4 with the pressure gauge 31 even if the gas leakage occurs. Therefore, according to the present embodiment, the reliability of the driving device 6a is improved.

As described above, according to the configuration of the second embodiment, the case 4 covering the drive device 6a is provided with the gate valve for gas sealing, and the gas is sealed in the case 4 so as to be in a pressurized state. In addition to the effects of mode 1, the increase in the frictional force of the drive device 6a due to the rusting of the drive device 6a and the inflow of dust and the like is suppressed, and the reliability of the drive device 6a is improved.

Third Embodiment
FIG. 7 is a diagram showing a drive device for a switchgear according to Embodiment 3 of the present invention and the periphery thereof.
In the figure, the inside is made airtight by connecting the case 4 which covers the drive device 6a via the flange 17 and the airtight member 8a. An adsorbent (or desiccant) 32 is placed inside the case 4.
The other configuration is the same as that of FIG. 4 of the first embodiment, but the airtight member (O-ring) 3b may be another airtight member, a bellows or the like described in the first embodiment.

By installing the adsorbent 32 in the case 4, it is possible to suppress the change in humidity due to age after the installation of the switchgear, and to keep the humidity in the case 4 constant. The rusting of the drive device 6a can be suppressed without performing the gas filling as in the second embodiment. The adsorbent 32 may be suitably replaced at the time of inspection.

As described above, according to the configuration of the third embodiment, since the adsorbent 32 is disposed in the case 4 covering the drive device 6a, in addition to the effects of the first embodiment, the rusting of the drive device 6a is suppressed The reliability of the drive device 6a is improved.

Fourth Embodiment
FIG. 8 is a diagram showing a drive device for a switchgear according to Embodiment 4 of the present invention and the periphery thereof.
In the figure, the inside is made airtight by connecting the case 4 which covers the drive device 6a via the flange 17 and the airtight member 8a. The case 4 is provided with the viewing window 5, but the vibration-proof member 7b is installed in the attachment portion (flange not shown) of the viewing window 5 and the case 4.
The other configuration is the same as that of FIG. 4 of the first embodiment, but the airtight member (O-ring) 3b may be another airtight member, a bellows or the like described in the first embodiment.

In the first to third embodiments, the vibration isolating member 7 is provided between the case 4 and the flange. However, in the present embodiment, the vibration isolating member 7 b is provided around the observation window 5 so that the observation window from the opening / closing device Propagation of vibration can be suppressed directly, and the viewing window 5 can be protected. Further, as it is sufficient to attach the vibration-proofing member 7b only to the periphery of the viewing window 5 as shown in the figure, the number of mounting places of the vibration-proofing member 7 is reduced, and the necessary vibration-proofing member 7 can be reduced.
Further, in the figure, the vibration isolation member 7b is provided only around the viewing window 5, but if the vibration isolation member 7 is provided between the case 4 and the flange 17 as in the first to third embodiments, vibration is produced. Control effect is improved.

As described above, according to the configuration of the fourth embodiment, since the anti-vibration member 7b is provided in the mounting portion of the observation window 5 provided in the case 4 covering the drive device 6a to the case 4, to the observation window from the opening / closing device In addition to the effects of the first embodiment, the effect of preventing the breakage of the viewing window 5 is also improved.

Embodiment 5
FIG. 9 is a cross-sectional view showing a drive device for a switchgear according to Embodiment 5 of the present invention and the periphery thereof.
In the figure, the inside is made airtight by connecting the case 4 which covers the drive device 6a via the flange 17 and the airtight member 8a. In the case 4, the anti-vibration member 7 c is installed at the mounting portion between the drive device 6 a and the flange 17. The position of the viewing window 5 provided in the case 4 is indicated by a dotted line.
The other configuration is the same as that of FIG. 4 of the first embodiment, but the airtight member (O-ring) 3b may be another airtight member, a bellows or the like described in the first embodiment.

By providing the anti-vibration member 7c directly to the drive device 6a, it is possible to prevent the propagation of the vibration due to the operation of the drive device 6a to the flange 17. That is, the propagation of vibration to the viewing window 5 of the case 4 can be suppressed via the flange 17. Therefore, with the configuration of the fifth embodiment, damage to the observation window 5 provided in the case 4 of the drive device 6a can be further prevented, and the same effects as the effects of the first embodiment can be obtained.

Sixth Embodiment
In the above-described first to fifth embodiments, the opening / closing device in which the vacuum valve 1 is accommodated in the pressure tank 11b has been described, but an example of the opening / closing device which is not accommodated in the pressure tank will be described.
FIG. 10 is a cross-sectional view showing a configuration of a switchgear according to Embodiment 6 of the present invention and a drive device therefor. In the figure, a drive mechanism 6 c of the switching device and a link mechanism 104 for transmitting the operation of the drive mechanism 6 c to the movable portion of the vacuum valve 1 are installed in the case 4. The operating rod 27 is connected to the link mechanism 104. The inside of the case 4 is kept airtight by the airtight member 3b installed in the sliding portion even if the operation rod 27 performs the opening and closing operation.
The operating rod 27 is connected to the vacuum valve 1 via the insulating rod 2 for insulating the drive unit and the current-carrying unit, and performs the opening and closing operation of the vacuum valve 1.
The drive unit 6c is connected to a wire 18 serving as a power supply (control) line for controlling and driving the drive unit, and is drawn out of the case 4 through the airtight member 8b. The drawn wire 18 is connected to a control device or control power supply of a switchgear (not shown). Further, the case 4 is provided with a viewing window 5 through an air-tight member 8b (for example, an O-ring or a T-ring) and a vibration-proof member 7b so that the drive device 6c and the link mechanism 104 can be viewed.

The vacuum valve 1 is housed in a cylindrical insulating cylinder 126 (in this case, including a fixed-side insulating cylinder and a movable-side insulating cylinder) made of an insulating material such as ceramic, and accommodated in the vacuum valve 1. The fixed side conductor 20 joined to the fixed side plate 25a which hermetically seals the fixed side of the fixed side, the fixed contact 22 connected to the fixed side conductor 20, and the movable contact provided so as to be able to contact or separate from the fixed contact 22 And the movable side conductor 21 which is connected to the movable contact 23 and which extends out of the vacuum valve 1 via the bellows 24 attached to the movable side end plate 25b so as to hermetically seal the vacuum valve 1 at the other end. It is configured.

The operation of the driving device 6c is changed to an operation of bringing the fixed contact 22 and the movable contact 23 of the vacuum valve 1 into contact with, separated, open and close, by the link mechanism 104 connected to the drive 6c. The driving device 6c drives the movable side conductor 21 via the operation rod 27 and the insulating rod 2, and brings the fixed contact 22 and the movable contact 23 into contact and separation. At this time, since the bellows 24 follows the movement of the movable side conductor 21, the vacuum in the vacuum valve 1 is maintained.
The vacuum valve 1 is mechanically held while maintaining insulation with the case 4 by the insulating support 107. The insulating support 107 is formed of an insulating resin.
The insulating rod 2 is connected at its both ends to the operating rod 27 and the movable side conductor 21, and is connected while securing an insulating distance which can electrically insulate the movable side conductor 21 and the operating rod 5.

As described above, the drive device 6 c is connected to the drive device 6 c via the link mechanism 104, and the drive device 6 c is covered by the case 4, and the airtight member 3 b is installed at the communication portion between the inside of the case and the outside air. The inside is sealed or airtight.
The airtight seal member 3b is not limited to the O-ring as described in the first embodiment, and may be an airtight member such as bellows, T-ring, or X-ring.

In the switchgear shown in FIG. 10, for example, power enters from the upper terminal 108 a and is drawn through the vacuum valve 1 to the lower terminal 108 b. Prevent the spread of the accident to surrounding equipments by interrupting the current flowing normally and the accident current generated when an electrical accident (ground fault, short circuit) occurs in the power system with the vacuum valve 1 Can.

As described above, according to the present embodiment, the same effects as in the first embodiment can be obtained. That is, according to the present embodiment, in the switchgear which is in the atmosphere except for the vacuum valve 1, the drive unit 6c is covered with the case 4 and the inside is sealed or hermetically sealed. Since dust and dirt from the surrounding area are not introduced, it is possible to suppress an increase in the frictional force of the drive device 6c and the link mechanism 104, and to prevent a decrease in switching electrode speed and a device failure.
In addition, since the viewing window 5 provided in the case 4 covering the drive device 6c is provided via the airtight member 8b and the vibration isolation member 7b, the drive device 6c and the link mechanism 104 can be visually confirmed. Can be eliminated and inspection time can be shortened. It is also possible to directly suppress the propagation of vibration from the switchgear to the observation window, and the effect of preventing the breakage of the observation window 5 is also improved.

Embodiment 7
FIG. 11 is a cross-sectional view showing a configuration of a switchgear according to Embodiment 7 of the present invention and a drive device therefor. In this embodiment, an example in which a gate valve for sealing gas and a pressure gauge are provided in the case 4 of the sixth embodiment is shown.
In the figure, the inside of the case 4 is made airtight by connecting it to the operation rod 27 through the airtight member 3b. The case 4 is provided with a gate valve 30 and a pressure gauge 31 for sealing the gas. A gas such as dry air (dry air), CO ₂ , N ₂ or the like is enclosed and filled in the airtight case 4 at, for example, the same or higher pressure than the atmospheric pressure. In order to seal the gas at a pressure higher than the atmospheric pressure, the case 4 is made of a member (for example, stainless steel of a predetermined thickness) having a strength sufficient to withstand the pressure difference with the atmospheric pressure.
The other configuration is the same as that of FIG. 10 of the sixth embodiment, but the airtight member (O-ring) 3b is not limited to the O-ring, and may be an airtight member such as bellows, T-ring or X-ring.

If the outside air flows into the drive unit 6c case 4, friction of the drive unit 6c and link mechanism 104 due to the rusting of the drive unit 6c and link mechanism 104 due to humidity rise in the case 4 and inflow of dust and the like in the air. There is a possibility of a rise in power.
Therefore, by making the inside of the case 4 airtight with a gas higher than the atmospheric pressure, even if a gas leak occurs, the gas leak can be easily determined by monitoring the pressure in the case 4 with the pressure gauge 31. The reliability of the drive device 6c is improved.

As described above, according to the configuration of the seventh embodiment, the gate valve for gas sealing is provided in the case 4 covering the drive device 6c, and the gas is sealed in the case 4 to make it into a pressurized state. In addition to the effects of the sixth aspect, the increase in the frictional force of the drive device 6c due to the rusting of the drive device 6c and the inflow of dust and the like is suppressed, and the reliability of the drive device 6c and the link mechanism 104 is improved.

Eighth Embodiment
FIG. 12 is a cross-sectional view showing a configuration of a switchgear according to Embodiment 8 of the present invention and a drive device therefor.
In the figure, the inside of the case 4 covering the drive device 6c is made airtight by connecting it to the operation rod 27 via the airtight member 3b. An adsorbent (or desiccant) 32 is placed inside the case 4.
The other configuration is the same as that of FIG. 10 of the sixth embodiment, but the airtight member (O ring) 3b is not limited to the O ring, and may be an airtight member such as bellows, T ring, or X ring. .

By installing the adsorbent 32 in the case 4, it is possible to suppress the change in humidity due to age after the installation of the switchgear, and to keep the humidity in the case 4 constant. The rusting of the drive device 6c can be suppressed without performing the gas filling as in the seventh embodiment. The adsorbent 32 may be suitably replaced at the time of inspection.

As described above, according to the configuration of the eighth embodiment, since the adsorbent 32 is disposed in the case 4 covering the drive device 6c, in addition to the effects of the sixth embodiment, the generation of the drive device 6c and the link mechanism 104 is performed. Rusting is suppressed, and the reliability of the drive device 6c and the link mechanism 104 is improved.

In the above embodiment, a circuit breaker having a vacuum valve is shown as one of the switch devices, and the drive device has been exemplified and described, but the present invention is not limited to this, and any other switch device having a drive device will be described. It may be
For example, it may be a gas circuit breaker which carries out the shutoff in SF ₆ gas or an air circuit breaker which carries out the shutoff in air. Although the electromagnetic drive device which drives a mover is shown by supplying with electricity to a coil in the above-mentioned embodiment, a spring may be stored by a motor and a spring drive device driven by the energy may be used.

In the present invention, the embodiments can be combined, modified as appropriate, or omitted within the scope of the invention.

1: Vacuum valve 2: 2: Insulating rod 3a: Bellows 3b: O-ring 3c: Airtight member 4: Case 5: Peep window 6a: Circuit breaker drive 6b: Disconnector drive 6c:

Drive Device

7, 7, 7b, 7c: Vibration-proof member, 8a, 8b: Airtight member, 10: Cubicle, 11a, 11b: Pressure tank, 12: Circuit breaker, 13: Disconnector, 14: Busbar, 15: Cable, 16a, 16b: conductor, 17: flange, 18: wiring, 20: fixed side conductor, 21: movable side conductor, 22: fixed contact, 23: movable contact, 24: bellows, 25a: fixed end plate, 25b: movable side end Plate, 26a: Fixed side insulating cylinder, 26b: Movable side insulating cylinder, 27: Operating rod, 28: Insulating support, 30: Gate valve, 31: Pressure Total, 32: adsorbent (or desiccant), 61: mover, 62: closing coil, 63: opening coil, 104: link mechanism, 107: insulating support, 108a, 108b: terminal, 126: Insulated tube.

Claims

A fixed side conductor provided with a fixed contact at an end, and a movable side conductor having a movable contact provided at one end so as to be capable of coming into and coming out of contact with the fixed contact;
And a driving device for driving the movable side conductor.
The driving device is
Covered in an airtight case with a viewing window,
It is connected to the movable side conductor via an insulating rod connected to the other end of the movable side conductor and an airtight connection portion,
An opening and closing device characterized in that a vibration isolation member is provided between the viewing window and the drive device.
The opening and closing device according to claim 1, wherein the viewing window is provided in the case via the anti-vibration member.
The switchgear according to claim 1 or 2, wherein the inside of the case is filled with a dry air, nitrogen, or carbon dioxide gas.
The switchgear according to claim 1 or 2, wherein an adsorbent or a desiccant is installed inside the case.
The switchgear according to any one of claims 1 to 4, wherein the fixed side conductor and the movable side conductor are accommodated in a vacuum valve.
The opening and closing device according to claim 5, wherein the vacuum valve is housed in a pressure tank, and the case is provided outside the pressure tank via the vibration isolation member.
The switchgear according to claim 5 or 6, wherein the vacuum valve is housed in a pressure tank, and the drive unit is provided outside the pressure tank via the vibration isolation member.