JP2000260267A - Gas-insulated switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device wherein the contact condition between a movable contact and a movable side conductor is always kept in a stable state by forming a contact between the movable contact and the base part of the movable contact, and by arranging a spring for generating a load in the contact in a case also serving as a bearing in a circumference-like form. SOLUTION: By electrically connecting movable contacts 5a-5c to movable side conductors 4a-4c through contacts 7, when the movable contacts 5a-5c are closed to fixed side electrodes, and in the case that the movable contacts 5a-5c are tilted, the displacement component is absorbed by the contacts 7, so that the contact between the movable contacts 5a-5c and the movable side conductors 4a-4c can be kept. Although the contact between the movable contacts 5a-5c and the movable side conductors 4a-4c should be kept from the start of the throwing to the completion thereof, each case 9 also serving as a bearing is also tilted when the movable contacts 5a-5c are tilted, so that the displacement of each spring 8 arranged in the case 9 also serving also as a bearing can be small, and the variation of the contact state can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear installed in an electric station such as a power station or a substation.
The present invention relates to a gas-insulated switch having an improved contact state of a movable contact of the switch.

[0002]

2. Description of the Related Art In general, gas-insulated switchgears are used in electric stations such as power stations and substations for connecting and disconnecting lines. This gas insulated switchgear is SF ₆
An insulating gas having excellent insulating properties such as a gas is sealed in a grounded metal container, and a high-voltage conductor insulated from the metal container by using an insulating spacer or the like is supported in the metal container. Such a gas insulated switchgear is composed of devices such as a circuit breaker, a disconnector, a ground switch, a connection bus, and a current transformer for opening and closing an electric circuit, and all these devices or main devices are gas-insulated. I have.

[0003] Recently, electric stations have been installed in places close to a power demanding place such as an urban area or an industrial area, or conversely, in a mountainous area far away from the power demanding place. There is a strong demand for a reduction in the site area of the place itself and the gas insulated switchgear used therefor and a reduction in the size of the components.

[0004] In order to meet such demands, a bus-integrated disconnector grounding switch, which is an example of a conventional gas insulated switchgear developed for the purpose of downsizing equipment, is shown in FIGS.
3 will be described.

FIG. 11 is a sectional view taken along the line BB of FIG. 12, FIG. 12 is a sectional view taken along the line AA of FIG.
3 is an enlarged view of the vicinity of the movable-side conductor in FIG. As shown in the figure, the busbar-integrated disconnector grounding switch 30 is, for example, S
In a container 13 filled with an insulating gas such as F ₆ gas, the conductors 2 a to 2 c of each phase of the bus are arranged in an isosceles triangular shape in a direction perpendicular to the paper such that one vertex is on the opposite side to the circuit breaker 12. It is arranged. In addition, each phase conductor 2a-2c of these buses
In the direction orthogonal to the direction, the fixed-side electrodes (DS) 3a to
3c, fixed-side electrodes (ES) 10a to 10c, and movable-side conductors 4a to 4c are arranged on the circuit breaker 12 side, respectively. The fixed electrodes (DS) 3a to 3c and the movable conductors 4a to 4c, and the fixed electrodes (ES) 10a to 10c and the movable conductors 4a to 4c are arranged to face each other. And
Fixed-side electrodes (ES) 10a-10c and movable-side conductors 4a-
4c, movable contacts 5a to 5c for opening and closing between the two electrodes.
5c is provided and is configured to be rotatable. By rotating inside the movable-side conductors 4a to 4c to the opposite side, the fixed-side electrodes (ES) 10a to 10c and the movable-side conductors 4a to 4c are rotated. It can be opened and closed between the poles. The movable contacts 5a to 5c and the movable-side conductors 4a to 4c
c is electrically connected to a contact (finger) 37 pressed by a spring 38. Contact 3
7 are arranged in a circumferential shape, and a uniform load is applied to the movable contacts 5 a to 5 c and the movable-side conductors 4 a to 4 c by a spring 38.

Opening and closing operations are performed by insulating rods 6a to 6c.
The operation is performed by an operating device 17 which is connected to the outside of the container 13 through a closing portion 16 having a bearing 14 and a rotary seal portion 15 provided on the container 13 through the opening.

[0007]

However, the above-mentioned conventional gas-insulated switch has the following problems to be solved. That is, in the conventional busbar-integrated disconnector grounding switch 30, since the movements of the contact 37 and the spring 38 are not restricted and are in a free state, the movable contacts 5a to
When the movable contact 5c rotates, the movable contact 5a to 5c or the movable contact 4a to 4c is contacted with the contact 3 by a spring 38.
In some cases, the load transmitted to the motor 7 becomes unstable, and the contact state may become unstable.

An object of the present invention is to provide a gas insulated switch in which the contact between the movable contact and the movable conductor is always stable.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a fixed contact portion and a movable contact portion are housed opposite to each other in a container filled with an insulating gas.
A movable contact that is rotatable to and away from the fixed contact portion, and a base of the movable contact is connected to an operation device provided outside the container via a drive shaft; A three-position type gas insulated switchgear capable of coaxially driving three positions of a first fixed side electrode on state, a first fixed side electrode off state, and a second fixed side electrode on state depending on the rotational position of the movable contact. A contact is provided between the movable contact and a base of the movable contact, and the contact and a spring for generating a load on the contact are circumferentially arranged in a case also serving as a bearing.

According to the first aspect, even when the movable contact is tilted, for example, when the movable contact is inserted into the fixed contact portion, the movable contact and the base of the movable contact are reliably maintained in contact with each other. There is an effect that the change in the state of the contact is reduced.

According to a second aspect of the present invention, in the gas insulated switchgear according to the first aspect, the base and the bearing of the movable contact are arranged so that the position of the contact does not fluctuate in the circumferential direction due to the rotation of the movable contact. A notch is provided in a case that also serves as a lock, and a detent is inserted into the notch.

According to the second aspect, the same effect as that of the first aspect is obtained. In addition, by preventing the position of the contact from changing in the circumferential direction, the sliding surface of the contact is movable. Limited to the side.

According to a third aspect of the present invention, in the gas insulated switchgear according to the first or second aspect, the rotating shaft protrudes from the base of the movable contact and the end has a curved surface to reduce electric field. It is characterized by having done.

According to the third aspect, the same effects as those of the first and second aspects can be obtained, and the electric field at the end which becomes the high electric field portion is reduced, and the withstand voltage performance is further improved, so that the reliability is improved. Is enhanced.

According to a fourth aspect of the present invention, in the gas insulated switch according to any one of the first to third aspects, a material having a higher hardness than the movable contact is brazed to a tip of the movable contact.
Alternatively, it is characterized by spraying.

According to the fourth aspect, the same effects as those of the first to third aspects are obtained. In addition, the tip of the movable contact, in particular, the portion that first comes into contact with the fixed contact portion when the movable contact is first contacted with the movable contact. By brazing or spraying a material having a high hardness, deformation of the movable contact caused by collision with the fixed contact can be reduced.

According to a fifth aspect of the present invention, in the gas insulated switchgear according to any one of the first to fourth aspects, the tip of the movable contact facing the fixed contact portion projects toward the fixed contact portion. It is characterized by having made it.

According to the fifth aspect, the same effects as those of the first to fourth aspects are obtained, and the tip of the movable contact facing the fixed contact portion protrudes toward the fixed contact portion. As a result, the electric field at the protruding portion is increased during opening and closing, so that the arc can be concentrated on this portion particularly at the time of opening and closing the current (eg, loop current, electromagnetic induction current). Can be.

According to a sixth aspect of the present invention, in the gas insulated switchgear according to any one of the first to fifth aspects, the movable contact comprises a movable conductor serving as a current-carrying part and a rotating shaft. A hole for engaging with the rotating shaft is provided.

According to the sixth aspect, the same effects as those of the first to fifth aspects are obtained. In addition, the movable contact is divided into a current-carrying portion, a movable conductor, and a rotating shaft, so that the material of the rotating shaft is reduced. Since the material of the movable conductor can be made different, it is possible to suppress damage to the rotating shaft during multiple operations by using a hard material for the rotating shaft that receives force during rotation. , Improving reliability.

According to a seventh aspect of the present invention, in the gas insulated switch according to the sixth aspect, the case, which also functions as a bearing, is prevented from coming off using a C-shaped retaining ring.

According to the seventh aspect, the same effect as that of the sixth aspect is obtained, and the C-shaped retaining ring serves as a stopper for preventing the case also serving as the bearing from coming off, so that it is possible to assemble the movable conductor from outside. Thus, workability can be improved.

According to an eighth aspect of the present invention, in the gas insulated switch according to the sixth or seventh aspect, a concave portion which engages with the rotating shaft is provided on the insulating rod. According to the eighth aspect, the same effects as those of the sixth and seventh aspects are obtained, and the power transmission efficiency is improved by providing the concave portion that engages with the rotating shaft in the insulating rod. That is, the tolerance is increased and the reliability is improved.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a first embodiment (corresponding to claim 1) of the present invention. FIG. 1 is a schematic cross-sectional view taken along the line BB of FIG. 2, and FIG. FIG. 3 is an enlarged view of the vicinity of the movable-side conductor in FIG.

As shown in the figure, a bus-bar-integrated disconnecting switch 1 according to the present embodiment includes conductors 2a to 2c of each phase of a bus in a container 13 filled with an insulating gas such as SF ₆ gas.
However, they are arranged in an isosceles triangular shape in the direction perpendicular to the paper such that one vertex is located on the opposite side to the circuit breaker 12. In the direction orthogonal to each of the phase conductors 2a to 2c of these buses,
The fixed-side electrodes (DS) 3a to 3c and the fixed-side electrodes (E
S) 10a to 10c and movable-side conductors 4a to 4c are provided on the circuit breaker 12 side, respectively, and a fixed-side electrode (DS)
3a-3c, movable-side conductors 4a-4c, and fixed-side electrodes (E
S) The movable-side conductors 4a to 4c are arranged to face each other. Then, the fixed-side electrodes (DS) 3a to 3
c and movable contacts 4a to 4c, movable contacts 5a to 5c for opening and closing between the two electrodes are provided so as to be rotatable and pass through the movable conductors 4a to 4c. By rotating to the opposite side, the fixed side electrode (ES) 10a
10c and the movable side conductors 4a to 4c can be opened and closed. The movable contacts 5a to 5c and the movable-side conductors 4a to 4c are electrically connected by a contact (finger) 7 pressed by a spring 8. A large number of the contacts 7 are circumferentially arranged inside a case 9 also serving as a bearing.
In this configuration, a uniform load is applied to the movable conductors a to 5c and the movable-side conductors 4a to 4c.

The opening and closing operation is performed by the insulating rods 6a to 6c.
The operation is performed by an operating device 17 installed outside the container 13 through a closing portion 16 having a bearing 14 provided on the container 13 and a rotary seal portion 15 through the opening.

Next, the operation of the present embodiment will be described.
The movable contacts 5a to 5c and the movable-side conductors 4a to 4c are electrically connected by the contact 7 so that, for example, the movable contacts 5a to 5c are fixed-side electrodes (DS) 3a to 3c or fixed-side electrodes. (ES) When the movable contacts 5a to 5c are inclined when being put into the 10a to 10c, the movable contact 5a to 5c and the movable side are absorbed by the contact 7 absorbing the displacement. Contact with the conductors 4a to 4c is maintained. As a result, the movable contacts 5a to 5c are fixed to the fixed electrodes (DS) 3a to 3c or the fixed electrodes (ES).
When the movable contacts 5a to 5c are thrown in, the movable contacts 5a to 5c are thrown in an inclined state, even if there is misalignment between the two. At this time, the contact between the movable contacts 5a to 5c and the movable-side conductors 4a to 4c must be maintained from the start to the completion of the closing, but when the movable contacts 5a to 5c are inclined, the case 9 serving also as a bearing is used. Also tilts similarly,
The amount of displacement of the spring 8 disposed in the case 9 can be small, and the change in the contact state is small.

As described above, according to the present embodiment, the three positions of the first fixed-side electrode on state, the first fixed-side electrode off state, and the second fixed-side electrode on state are determined by the drive shaft and the rotational position of the drive shaft. There are three positions that can be driven coaxially. Further, the movable contact and the base of the movable contact are in contact with each other by a contact arranged circumferentially between the movable contact and the base of the movable contact. Furthermore, the movable contact is circumferentially arranged inside the case that also serves as a bearing, and even when the movable contact rotates, the case serves as a bearing, so that the case can move inside the case in the same manner as the shaft moves. The contact arranged in the contact is also displaced, so that the contact state hardly changes (the change in the load applied to the contact is small). With this configuration, when the movable contact is tilted, for example, when the movable contact is inserted into the fixed contact portion, the state is hardly changed, and the movable contact and the base of the movable contact are reliably maintained in contact.

FIG. 4 is a block diagram of a main part of a second embodiment (corresponding to claim 2) of the present invention. The other parts are the same as those of the first embodiment, and the description thereof will be omitted. As shown in the figure, in the present embodiment, the fixed electrodes (DS) 3a to 3
Movable contacts 5a to 5c for opening and closing between the two electrodes are provided between the movable conductors 3a and 4c, and are configured to be rotatable. By rotating to the opposite side, the fixed side electrode (ES) 10
It is configured such that the gap between the movable conductors 4a to 4c and the movable side conductors 4a to 4c can be opened and closed. The movable contacts 5a to 5c and the movable-side conductors 4a to 4c are electrically connected by a contact 7 pressed by a spring 8 (not shown). A large number of the contacts 7 are circumferentially arranged inside a case 18 also serving as a bearing, and the movable contacts 5a to 5c and the movable-side conductor 4a are formed by springs 8 (not shown).
To 4c, a uniform load is applied.

Further, the case 18, which also serves as a bearing, is prevented from rotating by a detent 19, so that the contact 7 slides on the movable contacts 5a to 5c.

Next, the operation of the present embodiment will be described.
The movable contacts 5a to 5c are fixed electrode (DS) 3a to 3
c or fixed-side electrodes (ES) 10a to 10c, when there is a misalignment between the two, the movable contacts 5a to 5c
5c is supplied in an inclined state. At this time, the contact between the movable contacts 5a to 5c and the movable-side conductors 4a to 4c must be maintained from the start to the completion of the closing. However, when the movable contacts 5a to 5c are inclined, the case 18 also serving as a bearing is provided. Is similarly inclined, so that the amount of displacement of the spring 8 arranged in the case 18 can be small, and the change in the contact state is small.

Further, by limiting the sliding side of the contact 7 to the movable contacts 5a to 5c, the working roughness of the sliding surface of the non-slidable movable conductors 4a to 4c can be increased. Since the silver plating thickness can be reduced, the cost can be reduced while maintaining the same quality.

As described above, according to the present embodiment, the same effect as that of the first embodiment can be obtained. In addition, it is unclear which side of the first embodiment slides. By limiting to, for example, the contact surface of the contactor,
It is possible to have different surface roughness on the sliding side and on the non-sliding side, or different silver plating thickness. Of course, there is no problem if both sides are equivalent.

FIG. 5 is a block diagram of a main part of a third embodiment (corresponding to claim 3) of the present invention. Since the other parts are the same as those of the first and second embodiments, description thereof will be omitted. Omitted. As shown in the figure, in this embodiment, the fixed-side electrode (D
S) A movable contact 20a-20 for opening and closing between both electrodes is provided between 3a-3c (not shown) and the movable-side conductors 4a-4c.
c is provided and is configured to be rotatable. By rotating in the opposite side through the inside of the movable-side conductors 4a to 4c, the fixed-side electrodes (ES) 10a to 10c (not shown) are movable. The gap between the side conductors 4a to 4c can be opened and closed. The movable contacts 20a to 20c and the movable-side conductors 4a to 4c
It is electrically connected by a contact 7 pressed by a spring 8. The above is completely equivalent to the first embodiment and the second embodiment.

This embodiment is different from the first and second embodiments in that the end of the movable contact 20a opposite to the operating device protrudes from the movable conductor 4a and has a curved surface. Thereby, the concentration of the electric field is reduced, and the reliability is further improved.

As described above, according to the present embodiment, the same effects as those of the first and second embodiments can be obtained, and the end of the rotating shaft (the end phase opposite to the operating device) is connected to the base of the movable contact. By providing the curved surface so as to protrude further, the electric field concentration is eased, so that the withstand voltage performance is improved as compared with the first and second embodiments.

FIG. 6 is a block diagram of a main part of a fourth embodiment (corresponding to claim 4) of the present invention.
Since the third embodiment is the same as the third embodiment, the description thereof is omitted. As shown in the figure, in this embodiment, the fixed-side electrode (D
S) Movable contacts 21a to 21c are provided between 3a to 3c and movable-side conductors 4a to 4c to open and close between the two electrodes, and are configured to be rotatable.
4c, the gap between the fixed-side electrodes (ES) 10a to 10c (not shown) and the movable-side conductors 4a to 4c can be opened and closed. In addition, the movable contact 2
The movable conductors 4a to 4c are electrically connected to the movable conductors 4a to 4c by contacts 7 pressed by springs 8 (not shown). The above configuration is exactly the same as the first to third embodiments.

The present embodiment is different from the first to third embodiments in that a material having a higher hardness than the movable contact is brazed or sprayed to the tip 21b1 of the movable contact 21a to 21c to form a fixed electrode (not shown). DS) 3a to 3c or the fixed-side electrodes (ES) 10a to 10c (not shown) when they are put into contact with each other first. As a result, it is possible to reduce the deformation of the movable contacts 21a to 21c at the time of closing.

As described above, according to this embodiment, the same effects as those of the first to third embodiments can be obtained, and in addition, the tip of the movable contact that rotates freely can be made of a material having higher hardness than the movable contact. With this configuration, it is possible to reduce deformation of the movable contact caused by colliding with the fixed-side contact at the time of insertion into the fixed contact.

As a modified example (corresponding to claim 4) of the present embodiment, the tip 21b of the movable contacts 21a to 21c in the present embodiment is
First, a material having higher hardness than the movable contact is brazed or sprayed to form a Cu-W alloy.

The operation of this modification is the same as that of this embodiment, but the Cu-W alloy also functions as an arc-resistant piece, so that the arc is less damaged during current switching (eg, loop current, electromagnetic induction current). Become.

FIG. 7 is a block diagram of a main part of a fifth embodiment (corresponding to claim 5) of the present invention. Since the other parts are the same as those of the first to fourth embodiments, description thereof will be omitted. Omitted. As shown in the figure, in this embodiment, the fixed-side electrode (D
S) Movable contacts 22a to 22c are provided between 3a to 3c and movable-side conductors 4a to 4c to open and close between the two electrodes, and are configured to be rotatable.
4c, it is possible to open and close the gap between the fixed-side electrodes (ES) 10a to 10c (not shown) and the movable-side conductors 4a to 4c. The movable contacts 22a to 22c and the movable-side conductors 4a to 4c
Are electrically connected to each other by a contact 7 pressed by a spring 8 (not shown). The above configuration is exactly the same as the first to fourth embodiments.

This embodiment is different from the first to fourth embodiments in that the fixed contacts (DS) of the movable contacts 22a to 22c are different.
3a-3c or fixed side electrode (ES) 10a-10c
(Not shown), the front end portion 22b1 is protruded, so that the protruding portion 2b1 is opened and closed during opening and closing.
The electric field of 2b1 becomes high, and the arc generated especially at the time of current switching (for example, loop current, electromagnetic induction current) is generated in this portion 2
By focusing on 2b1, the portion to be damaged can be limited.

As described above, according to the present embodiment, the same effects as those of the first to fourth embodiments can be obtained, and the tip of the movable contact rotatably rotatable so as to come into contact with the fixed contact portion protrudes. By doing so, the electric field at the protruding portion is increased during opening and closing, and it is possible to concentrate the arc generated particularly at the time of opening and closing the current (for example, a loop current and an electromagnetic induction current) on this portion. It is possible to limit the portion that receives the damage of the child arc.

FIG. 8 is a structural view of a main part of a sixth embodiment of the present invention (corresponding to claim 6). Since the other parts are the same as those of the first to fifth embodiments, description thereof will be omitted. Omitted. As shown in the figure, in this embodiment, the fixed-side electrode (D
S) Movable conductors 23a to 23c for opening and closing between both electrodes are provided between 3a to 3c (not shown) and movable side conductors 4a to 4c.
Are provided on the movable conductors 23a to 23c.
Is formed so as to be rotatable by rotating the rotating shaft 24, and the movable conductors 23a to 23c are moved to the movable side conductors 4a to 4c.
c, the fixed-side electrodes (ES) 10a to 10c (not shown) and the movable-side conductor 4a
4c can be opened and closed. Also,
The movable conductors 23a to 23c and the movable-side conductors 4a to 4c
It is electrically connected by a contact 7 pressed by a spring 8.

That is, in the first to fifth embodiments,
The movable contact (for example, 5a to 5c), which was integrated,
Except for the configuration in which the movable conductors 23a to 23c serving as current-carrying parts are divided into the rotating shaft 24, the same operation and effect as those of the first to fifth embodiments can be obtained.

In addition, in this embodiment, since the rotating shaft 24 is not related to the energization, the rotating shaft 24 is made of a material having high hardness (there is no problem even if the conductivity is low).
It is possible to design with a margin for the force applied at the time of rotation (reduction of damage), and it is possible to further improve reliability for multiple operations.

As described above, according to this embodiment, the same effects as those of the first to fifth embodiments can be obtained, and in addition, the movable contact which can be freely contacted and separated can be connected to the movable conductor serving as the current supply portion and the rotating shaft. By dividing, it is possible to make the material of the rotating shaft different from that of the movable conductor. Therefore, the rotating shaft that receives force during rotation should be made of a material with high hardness (the conductivity may be low). Thus, it is possible to further improve the reliability.

FIG. 9 is a diagram showing the construction of a main part of a seventh embodiment (corresponding to claim 7) of the present invention. The configuration other than this configuration is the same as that of the sixth embodiment, and a description thereof will be omitted. As shown in the figure, in the present embodiment, a groove for a C-shaped retaining ring 26 is provided in the movable-side conductors 25a to 25c, and the C-shaped retaining ring 26 is mounted in this groove, whereby the case 9 serving as a bearing is movable. Side conductor 2
5a to 25c is prevented from slipping out. With this configuration, the case 9 also serving as a bearing is moved to the movable-side conductors 25a to 25a.
It becomes possible to assemble from the outside of 25c.

As described above, according to this embodiment, the same effects as those of the sixth embodiment can be obtained, and the case also serving as the bearing can be assembled from the outside of the base of the movable contact (inserted from outside). The C-shaped retaining ring may be attached later), thereby greatly improving workability.

FIG. 10 is a block diagram of a main part of an eighth embodiment (corresponding to claim 8) of the present invention. Since the other parts are the same as those of the sixth and seventh embodiments, the description thereof will be omitted. Omitted. As shown in the figure, in this embodiment, the fixed-side electrode (D
S) Movable conductors 23a to 23c for opening and closing between both electrodes are provided between 3a to 3c (not shown) and movable side conductors 4a to 4c.
Are formed, and the insulating rods 28a to 28c form a hole (for example, a square) that engages with the rotating shaft 27, so that the rotating shaft 27 rotates, thereby moving the movable conductors 23a to 23c inside the movable-side conductors 4a to 4c. , And can be opened and closed between the fixed-side electrodes (ES) 10a to 10c (not shown) and the movable-side conductors 4a to 4c. The movable conductors 23a to 23c and the movable conductors 4a to 4a
4c is electrically connected by a contact 7 pressed by a spring 8. The above configuration is the same as in the seventh embodiment.

As described above, according to the present embodiment, the same effects as those of the seventh and eighth embodiments can be obtained. In addition, for example, when the engagement portion is a quadrangle, the concave portion having the shape and size of the rotating shaft is replaced with an insulating rod. Since it is provided on the side, the opposite side is longer than when the concave portion is provided on the rotating shaft side, that is, the power transmission efficiency is improved. In addition, since a portion where the insulating rod and the rotating shaft are engaged with each other is an engagement between the metals, the strength against the force received during rotation is sufficient, and the reliability is improved.

As a first modification (corresponding to claim 8) of this embodiment, in addition to the seventh and eighth embodiments, the buried shields 28a1 to 28c of the insulating rods 28a to 28c are provided.
By providing a concave portion (for example, a square) that engages with the rotating shaft 27 in FIG. 1, the length of the moment arm of the engaging portion can be lengthened. In this case, the deformation due to rotation is small because the metal is engaged. Become.

Although not particularly shown as a second modification of the present embodiment (corresponding to claim 8), the same operation as the above-described sixth to eighth embodiments can be achieved by integrating the movable-side conductor. In addition, the strength of the movable-side conductor is increased and the contact resistance of the movable-side conductor itself is reduced, so that the reliability is improved. Although the three-position type gas insulated switch has been described above, it is needless to say that the invention can be applied to one single gas insulated switch.

[0055]

As described above, the present invention (Claim 1)
According to claim 8), even when the movable contact is tilted, for example, when the movable contact is inserted into the fixed contact portion, the movable contact and the base of the movable contact are kept in contact with each other. It is possible to provide a gas-insulated switch in which the contact state between the contact and the movable-side conductor is always in a stable state.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, and FIG.
Sectional drawing seen from the -B direction.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged view of the vicinity of a movable-side conductor in FIG. 1;

FIG. 4 is a sectional view showing the vicinity of a movable-side conductor according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing the vicinity of a movable-side conductor according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing the vicinity of a movable-side conductor according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing the vicinity of a movable-side conductor according to a fifth embodiment of the present invention.

FIG. 8 is a sectional view showing the vicinity of a movable-side conductor according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view showing the vicinity of a movable-side conductor according to a seventh embodiment of the present invention.

FIG. 10 is a sectional view showing the vicinity of a movable-side conductor according to an eighth embodiment of the present invention.

11 is a configuration diagram of a conventional gas-insulated switch, and FIG.
2 is a cross-sectional view as seen from the BB direction.

FIG. 12 is a cross-sectional view taken along the line AA in FIG. 11;

FIG. 13 is an enlarged view of the vicinity of a movable-side conductor in FIG. 11;

[Explanation of symbols]

1: Busbar-integrated disconnector grounding switch, 2a-2c: conductor,
3a to 3c: fixed electrode (DS), 4a to 4c: movable conductor, 5a to 5c: movable contact, 6a to 6c: insulating rod, 7: contact (finger), 8: spring, 9: bearing Case also serving as 10a to 10c ... fixed-side electrode (E
S), 11 operating device, 12 circuit breaker, 13 container, 1
4 ... bearing, 15 ... rotary seal, 16 ... closing part, 17 ...
Operating device, 18: Case also serving as bearing, 19: Detent, 20a to 20c: Movable contact, 21a to 21c: Movable contact, 22a to 22c: Movable contact, 23a to 23
c: movable conductor, 24: rotating shaft, 25a to 25c: movable side conductor, 26: C-shaped retaining ring, 27: rotating shaft, 28a to 28
c ... Insulated rod.

Claims (8)

[Claims] A fixed contact portion and a movable contact portion are accommodated in a container filled with an insulating gas so as to oppose each other, and a movable contact rotatably rotatable to and away from the fixed contact portion is provided. The base of the movable contact is connected to an operating device provided outside the container via a drive shaft, and the first fixed-side electrode is turned on and the first fixed-side electrode is turned on by the drive shaft and the rotational position of the drive shaft. In a three-position gas-insulated switch that can coaxially drive the three positions of the off state and the second fixed-side electrode on state, a contact is provided between the movable contact and a base of the movable contact,
A gas insulated switch, wherein a spring for generating a load on the contact is circumferentially arranged in a case also serving as a bearing. 2. The gas insulated switchgear according to claim 1, wherein the position of the contact is not fluctuated in the circumferential direction due to the rotation of the movable contact. A gas-insulated switch, wherein a detent is inserted into the notch. 3. The gas insulated switch according to claim 1, wherein the rotating shaft protrudes from the base of the movable contact, and the end is curved to reduce the electric field. Gas insulated switchgear. 4. The gas insulated switch according to claim 1, wherein a material having a hardness higher than that of the movable contact is soldered or thermally sprayed to a tip of the movable contact. Insulated switchgear. 5. The gas insulated switch according to claim 1, wherein a tip of the movable contact facing the fixed contact portion protrudes toward the fixed contact portion. Gas insulated switchgear. 6. The gas-insulated switch according to claim 1, wherein the movable contact comprises a movable conductor serving as a current-carrying part and a rotating shaft, and the movable conductor is engaged with the rotating shaft. A gas-insulated switch characterized by having a hole portion formed therein. 7. The gas-insulated switch according to claim 6, wherein the case, which also serves as a bearing, is prevented from coming off using a C-shaped retaining ring. 8. The gas insulated switch according to claim 6, wherein the insulating rod is provided with a concave portion that engages with the rotating shaft.