JP2000294090A - Switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce ground accidents by electrically insulating a vacuum container from a ground voltage. SOLUTION: A main circuit switch portion 20 and a ground switch portion 30 is stored in a vacuum container 10 of this switch gear, and the main circuit switch portion 20 comprises a fixed electrode 21a at the tip of a fixed electrode bar 21 connected to a bus and a movable electrode 22a at the tip of a movable electrode bar 22. The fixed electrode bar 21 and the movable electrode bar 22 are fixed to the vacuum container 10 and are electrically insulated from the vacuum container 10. The ground switch portion 30 comprises a fixed electrode 31a and a movable electrode 32a at respective tips of the fixed electrode bar 31 and a movable electrode bar 32 that are placed in parallel with the fixed electrode bar 21 and the movable electrode bar 22. The fixed electrode bar 31 and the movable electrode bar 32 are fixed to the vacuum container 10 and are electrically insulated from the vacuum container 10. Because the vacuum container 10 is not grounded, voltage of the vacuum container 10 is equal to the voltage between voltage in discharge portions of the main circuit switch portion 20 and the ground switch portion 30 and ground voltage outside the vacuum container 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function in which a main circuit switch for connecting / disconnecting a bus-side conductor and a load-side conductor and a grounding switch for connecting / disconnecting a load-side conductor and a grounding conductor are integrated. The present invention relates to a switchgear including a unit.

[0002]

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

As one of such switch gears,
As disclosed in Japanese Patent Publication No. Hei 7-28488,
A configuration in which a main circuit switch and a ground switch are integrated with a part of the connection conductor and a functional unit is provided, and this functional unit is arranged in a box, and only the connection with the bus and the power transmission cable may be performed. There is a switchgear.

FIG. 13 is a plan sectional view showing the structure of a main part of the switchgear, and FIG. 14 is an electrical connection diagram thereof. As shown in FIG. 13, this switchgear includes a bushing 2a for connecting a power transmission cable, which penetrates a part of a peripheral wall of a metal container 1 in which an insulating gas is sealed, into and out of the peripheral wall, and a part of the peripheral wall. Bushing 2 for busbar connection penetrating inside and outside
b, and a configuration in which first, second, and third switches 3, 4, and 5 and a vacuum arc extinguishing chamber 9 are disposed inside the container 1.

A bus-side branch conductor 6 connected to an external bus (not shown) via a bushing 2b is supported by an insulating support insulator 11 fixed to a part of the peripheral wall of the container 1 and is inserted into the container 1. A switchgear (not shown) configured inside the vacuum arc extinguishing chamber 9 and the first switchgear 3.
Is connected to an intermediate conductor 60 fixedly supported by an insulating support insulator 60a fixed to a part of the peripheral wall of the container 1, and is branched in two directions by the intermediate conductor 60. 3 are connected to a load-side conductor 2 supported by a bushing 2a via switches 4 and 5, and are connected to an external power transmission cable (not shown) via the load-side conductor 2.

FIG. 13 shows only a circuit for one phase, but as shown in FIG. 14, this switchgear has a three-phase circuit configuration, and includes the bushings 2a and 2b and the first switch. 3, the second switch 4, and the third switch 5 are each provided with one set of each phase.

Each of the switches 3, 4, and 5 has a swing electrode which swings in accordance with the operation of each of the other operating mechanisms (not shown) transmitted through the metal link 8 and the insulating link 7. The first switch 3 is configured to realize a closed position, a ground position, and a disconnected position in accordance with the swing position of the swing electrode.
The closed position is a position connecting the output electrode of the switching device inside the vacuum arc extinction chamber 9 and a fixed electrode protruding at a position corresponding to the intermediate conductor 60, and the grounding position is connected to the swing electrode. The disconnection position is a position connecting the grounding conductor 10a and the disconnection position is intermediate between the two positions, and is a position away from the fixed electrode and the grounding conductor 10a.

The second and third switches 4 and 5 are provided with a fixed electrode and a grounding conductor projecting at corresponding positions of the load-side conductor 2 and the intermediate conductor 60 by the swing of each swing electrode. 10
The configuration is such that three positions similar to those of the first switch 3 are realized between the first switch b and the switch 10b.

According to the above arrangement, the main circuit switch for connecting / disconnecting the bus-side branch conductor 6 and the load-side conductor 2 and the grounding switch for grounding the load-side conductor 2 are connected to the connecting conductor. And the busbar-side branch conductor 6 is connected to the busbar outside the container 1 via the bushing 2b.
What is necessary is just to connect the load side conductor 2 to the power transmission cable outside the container 1 via the bushing 2a.

[0010]

In the above-mentioned conventional switchgear, since the container 1 is grounded, the charged portions of the first, second and third switches 3, 4, 5 and the container 1 And the potential difference between them becomes large, and a ground fault is likely to occur.

Between the branch conductor 6 on the bus side and the conductor 2 on the load side, two switches, ie, first and second switches 3, 4 or first and third switches 3, 5 are provided. Since they are arranged in series, there is a problem that miniaturization of the container 1 is restricted in order to secure these arrangement spaces.

An insulating gas is sealed in the container 1, and in the switches 3, 4, and 5, between the three phases, between the ground, and between each pole at the disconnection position. It is necessary to secure an insulation distance according to the type of the switch. Therefore, each of the switches 3, 4, and 5 becomes large, and each switch 3,
In order to keep a sufficient separation distance between 4 and 5, there was a problem that miniaturization of the container 1 was limited.

Further, since the vacuum arc extinguishing chamber 9 is provided for each phase of the three-phase circuit, downsizing of the container 1 is restricted in order to secure these arrangement positions, and the product cost increases. There was a problem.

Further, when an arc short circuit occurs in the container 1, an explosion phenomenon in which the insulating gas sealed in the container 1 becomes high temperature and high pressure within a short time due to the arc energy is caused. , The container 1 includes:
It is necessary to provide an open part for pressure relief, and it is required to have strength to withstand high pressure until the pressure release is completed.
There was a problem that the structure of the container 1 became complicated and the product cost increased.

The present invention has been made in view of such circumstances, and has as its object to provide a switchgear in which the occurrence of a ground fault is reduced by separating a vacuum vessel from a ground potential.

Another object of the present invention is to provide a switchgear in which the main circuit switch and the ground switch are housed in a single vacuum vessel, whereby the size of the switchgear can be significantly reduced as compared with the prior art. It is in.

Another object of the present invention is to provide a switchgear whose product cost is reduced as compared with the conventional one by simplifying its structure.

Another object of the present invention is to provide a switchgear which, by forming a main circuit switch and a ground switch in a vacuum, does not cause an explosion even when an arc short circuit accident occurs in the container. Is to do.

[0019]

According to a first aspect of the present invention, there is provided a switchgear comprising: a main circuit opening / closing portion for connecting / disconnecting a fixed electrode connected to one of a bus-side conductor or a load-side conductor and a movable electrode connected to the other; It is characterized by comprising a vacuum vessel which houses a fixed electrode connected to one of the conductor or the grounding conductor and a grounding opening / closing part for moving and separating the movable electrode connected to the other, and which is to be electrically insulated from the ground potential.

According to the switchgear according to the first aspect of the invention, since the vacuum vessel is electrically insulated from the ground potential, the potential of the vacuum vessel becomes a potential between the potential of the charging section of the switch and the ground potential. Therefore, the respective potential differences between the charging section and the vacuum vessel and between the vacuum vessel and the ground potential do not become large, and the occurrence of ground fault can be reduced.

In addition, since the main circuit switch and the ground switch are housed in a vacuum having high insulation performance, the required insulation distance between them can be reduced, and the size can be significantly reduced as compared with the conventional case. Becomes possible.

When an arc short circuit occurs in the vacuum vessel, there is no possibility that an explosion occurs due to the arc short circuit because no gas exists in the vacuum vessel.

The switchgear according to the second aspect of the present invention includes two operation parts for operating the main circuit switching part and the grounding switching part, respectively, and the two operation parts are provided in parallel on the outer peripheral surface of the vacuum vessel. It is characterized by.

According to the switchgear according to the second aspect of the present invention, since the operation parts of the main circuit opening / closing part and the grounding opening / closing part are arranged adjacent to each other, it is possible to simplify the interlock of both drive mechanisms.

In a switchgear according to a third aspect of the present invention, the pair of electrodes of the main circuit opening / closing section are disposed inside an insulator for electrically insulating the fixed side of the main circuit opening / closing section from the vacuum vessel. It is characterized by.

According to the switchgear according to the third aspect of the present invention, the pair of electrodes of the main circuit opening / closing section are housed in an insulator that insulates the main circuit opening / closing section fixed side from the vacuum vessel, thereby improving withstand voltage performance. It is also possible to increase the size of the insulator while reducing the size of the vacuum container,
For this reason, it is possible to reduce the product cost.

A switchgear according to a fourth aspect of the present invention is characterized in that an arc shield disposed around an electrode of the main circuit opening / closing section is electrically insulated from the vacuum vessel.

According to the switchgear according to the fourth aspect of the present invention, since the vacuum vessel and the arc shield are electrically insulated, the voltage of the vacuum vessel is reduced when discharge occurs from the electrode of the main circuit switch to the arc shield. Without increasing, it is possible to further improve the withstand voltage performance.

The switchgear according to the fifth invention is connected to the load-side electrode of the main circuit switch, and includes an insulating rod having a metal shield for alleviating an electric field, and a main circuit switch and a ground switch. The load-side electrodes are electrically connected to each other, and the fixed portion on the main circuit opening / closing portion side includes a flexible conductor having a size larger than the outer diameter of the insulating rod.

According to the switchgear of the fifth aspect, since the fixed portion of the flexible conductor on the main circuit opening / closing side is larger than the outer diameter of the insulating rod, the electric field concentration at the shield end of the insulating rod is reduced. In addition, it is possible to prevent metal vapor from the main circuit opening / closing portion from adhering to the insulating rod.

In a switchgear according to a sixth aspect of the present invention, the insulating rod of the main circuit opening / closing section is disposed inside an insulator for electrically insulating the movable side of the main circuit opening / closing section from the vacuum vessel. A pair of electrodes is disposed inside an insulator for electrically insulating the movable side of the grounding opening / closing unit from the vacuum vessel.

According to the switchgear according to the sixth aspect of the present invention, since the insulating rod and the pair of electrodes of the grounding opening / closing part are respectively disposed inside the insulator, the withstand voltage performance can be further improved.

A switchgear according to a seventh aspect of the present invention is provided with a pair of electrodes that can be connected and separated in the middle of a flexible conductor that electrically connects the respective load-side electrodes of the main circuit switch and the ground switch. It is characterized by.

According to the switchgear according to the seventh aspect of the present invention, the bus side and the load side can be brought into contact with and separated from each other not only by the main circuit opening / closing section but also by the pair of electrodes provided in the middle of the flexible conductor. Therefore, the withstand voltage performance can be further improved.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a front sectional view showing a configuration of a main part of a switch gear according to Embodiment 1 of the present invention, FIG. 2 is a top view thereof, and FIG. It is a side view.

In the drawing, reference numeral 10 denotes a metal vacuum vessel. A main circuit opening / closing section 20 and a ground opening / closing section 30 are housed in the vacuum vessel 10. The main circuit opening / closing section 20 includes a fixed electrode 21 a at a tip of a fixed electrode rod 21 connected to a bus bar, and a movable electrode 22 a at a tip of a movable electrode rod 22. The fixed electrode rod 21 includes a sealing member 41a, an insulator 5
1, and is fixed to the vacuum container 10 via the sealing member 41b, and is electrically insulated from the vacuum container 10. On the other hand, the movable electrode rod 22 is longitudinally connected to an operation rod 24 via an insulating rod 23. The operation rod 24 operates the main circuit opening / closing unit 20 to a closed position, a cutoff position, and a disconnection position. Is connected to the operation unit 61. Also, the operation stick 24
Is connected to the vacuum container 10 via a bellows 71, a sealing member 42a, an insulator 52, and a sealing member 42b.
0 and is operable while maintaining the airtightness in the vacuum vessel 10.

The insulating rod 23 has a structure in which metal shields 23b, 23b each having a substantially U-shaped annular shape in a longitudinal section are disposed on the outer peripheral surfaces of both ends of a cylindrical insulator 23a. Reference numeral 23b denotes an insulator 2a for reducing the electric field at the connection boundary with the insulator 23a, protecting the surface of the insulator 23a, and protecting the insulator 2a from metal vapor generated when the main circuit opening / closing section 20 switches the current.
3a and the bellows 71 are provided for protection.

A cylindrical arc shield 26 is provided around the main circuit opening / closing section 20 in order to suppress metal vapor scattering at the time of opening / closing of current, and is fixed to the vacuum vessel 10. In addition, near the boundaries between the sealing member 41a and the insulator 51, the insulator 51 and the sealing member 41b, the insulator 52 and the sealing member 42b, the electric field is reduced, and the metal on the inner surfaces of the insulators 51 and 52 is reduced. In order to suppress contamination by steam, the ring 51a,
51b and 52a are provided respectively.

On the other hand, the grounding opening / closing section 30 is provided with a fixed electrode 31a at the tip of each of the fixed electrode rod 31 and the movable electrode rod 32 disposed in parallel with the fixed electrode rod 21 and the movable electrode rod 22.
And the movable electrode 32a. Inside the vacuum vessel 10, the fixed electrode rod 31 is disposed on the movable electrode 22a side of the main circuit opening / closing section 20, and the movable electrode rod 32 is disposed on the fixed electrode 21a side of the main circuit opening / closing section 20, respectively. Fixed electrode rod 3
1 is a sealing member 43a, an insulator 53, and a sealing member 43
b, and is fixed to the vacuum container 10 via the vacuum container 1.
0 and electrically insulated. On the other hand, the movable electrode rod 3
An operation unit 62 for opening and closing the grounding opening and closing unit 30 is provided.
It is connected to the. The movable electrode rod 32 is a bellows 7.
2. It is connected to the vacuum container 10 via the sealing member 44a, the insulator 54, and the sealing member 44b, is electrically insulated from the vacuum container 10, and can operate while maintaining airtightness in the vacuum container 10. Has become.

The sealing member 43a, the insulator 53, and the insulator 5
3 and sealing member 43b, insulator 54 and sealing member 44b
Near each of the boundaries, the electric field is reduced and the insulators 53,
Rings 53a, 53b, and 54a are provided respectively to suppress contamination of the inner surface of the metal member 54 with metal vapor.

The movable electrode bar 22 of the main circuit switch 20 and the fixed electrode bar 31 of the ground switch 30 are electrically connected by a deformable flexible conductor 80. When the main circuit switch 20 is in the closed state and the ground switch 30 is in the open state, a current flows between the fixed electrode rod 21 of the main circuit switch 20 and the fixed electrode 31 of the ground switch 30. Becomes

In the switchgear configured as described above, since the vacuum vessel 10 is not grounded, the potential of the vacuum vessel 10 is different from the potential of the charging section of the main circuit opening / closing section 20 and the grounding opening / closing section 30 and the potential of the vacuum vessel. 10 and the potential difference between the vacuum vessel 10 and the charging unit and between the vacuum vessel 10 and the ground potential do not increase, thereby reducing the occurrence of a ground fault. be able to.

Further, since the main circuit switching unit 20 and the ground switching unit 30 are formed in a vacuum having a high insulation performance, the required insulation distance between the respective components can be reduced, which is much larger than in the past. It is possible to reduce the size.

Further, even when an arc short-circuit occurs inside the vacuum vessel 10, there is no possibility that an explosion occurs due to the arc short-circuit because no gas exists inside the vacuum vessel 10.

Embodiment 2 FIG. 4 is a front sectional view showing a configuration of a main part of a switch gear according to Embodiment 2 of the present invention, FIG. 5 is a top view thereof, and FIG. 6 is a side view thereof. .

The operation units 61 and 62 for operating the main circuit switching unit 20 and the grounding switching unit 30, respectively, are
The operating rod 24 and the movable electrode rod 32 are arranged in parallel on the same side inside the vacuum vessel 10 and protrude outward from the same surface of the vacuum vessel 10,
The operation units 61 and 62 are connected to the operation units 61 and 62, respectively. On the other hand, opposed to these, the fixed electrode rod 21 of the main circuit opening / closing section 20 and the fixed electrode rod 31 of the grounding opening / closing section 30 are arranged in parallel, and the surface on which the movable electrode rod 32 and the operation rod 24 protrude. And protrudes out of the vacuum vessel 10 from the surface facing the. In addition, the same reference numerals are given to the same parts as in the first embodiment, and the description will be omitted.

In the switchgear configured as described above, since the respective operating portions 61 and 62 of the main circuit opening / closing portion 20 and the grounding opening / closing portion 30 can be arranged adjacent to each other, the operating portions 61 and 6 are provided.
The interlock between the two drive mechanisms can be simplified.

Third Embodiment FIG. 7 is a front sectional view showing a configuration of a main part of a third embodiment of a switchgear according to the present invention, and FIG. 8 is a side view thereof.

Except for the ring 51b, the electrodes 21a, 22a and the arc shield 26 of the main circuit
1, the arc shield 26 also has a structure that also serves to alleviate the electric field near the joint between the insulator 51 and the sealing member 41b. In addition, the same reference numerals are given to the same parts as in the second embodiment, and the description is omitted.

In the switchgear configured as described above, since the electrodes 21a and 22a of the main circuit opening / closing section 20 are accommodated in the insulator 51, the size of the vacuum vessel 10 can be reduced.
When the vacuum container 10 is formed by press working,
The drawing depth is reduced, and the manufacturing cost of the vacuum vessel 10 can be reduced.

Fourth Embodiment FIG. 9 is a front sectional view showing the configuration of a main part of a fourth embodiment of a switchgear according to the present invention.

A support for supporting the arc shield 26 disposed around the electrodes 21 a and 22 a of the main circuit opening / closing section 20 is provided on the outer peripheral surface of the arc shield 26, and this is engaged with the center of the insulator 51. Then, the arc shield 26 is fixed, and the arc shield 26 is electrically insulated from the vacuum vessel 10. In addition, the same parts as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the switchgear configured as described above, since the arc shield 26 and the vacuum vessel 10 are electrically insulated, the electrodes 21a, 2
Even when a discharge occurs from 2a to the arc shield 26, the vacuum vessel 10 does not become a high potential, and the withstand voltage performance is improved.

It should be noted that the insulator 51 may be composed of two parts and fixed with the arc shield 26 interposed therebetween.

Fifth Embodiment FIG. 10 is a front sectional view showing the configuration of a main part of a fifth embodiment of the switchgear according to the present invention.

The flexible conductor 80 for electrically connecting the main circuit opening / closing section 20 and the grounding opening / closing section 30 comprises two pairs of conductor plates 81
Both ends of the plate-shaped flexible conductor 80 are sandwiched between a and 81b, and are fixed by screws 81c. Conductor plate 81
Reference numerals a and 81b are fixed to the movable electrode rod 22 and the fixed electrode rod 31, respectively, and are thereby connected to the main circuit switching unit 20 and the ground switching unit 30. Also, this conductor plate 81
a and 81b are larger than the outer diameter of the insulating rod 23, so that the electric field concentration at the end of the shield 23b of the insulating rod 23 is alleviated, and the metal vapor when the main circuit opening / closing section 20 is cut off is reduced by the insulating rod 23. Adhesion to the surface of the insulator 23a is suppressed. In addition, the same parts as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the switchgear configured as described above, by using the conductor plates 81a and 81b, connection of the flexible conductor 80 is facilitated, and assembling workability is improved. In addition, since the electric field at the end of the shield 23b of the insulating rod 23 can be reduced and the metal vapor when the main circuit opening / closing section 20 is shut off can be suppressed from adhering to the surface of the insulator 23a of the insulating rod 23, the withstand voltage performance is improved. I do.

Note that a metal plate having a large resistance may be used as one of the conductor plates 81a and 81b for the purpose of reinforcing the strength.

Sixth Embodiment FIG. 11 is a front sectional view showing the configuration of a main part of a sixth embodiment of the switchgear according to the present invention.

The insulating rod 23 of the main circuit opening / closing section 20 is disposed inside the insulator 52. In addition, the grounding switch 30
The electrodes 31a and 32a are arranged inside the insulator 54. In addition, the same parts as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the switch gear configured as described above, the inside of the vacuum vessel 10 in the closed, disconnected, and disconnected states is
Since the insulating rod 23 and the ground opening / closing part 30 where the ground potential and the charged part face each other are disposed in the insulators 52 and 54, the occurrence of ground fault can be reduced, and the withstand voltage performance can be reduced. improves.

Seventh Embodiment FIG. 12 is a front sectional view showing a configuration of a main part of a seventh embodiment of the switchgear according to the present invention.

An opening / closing section 90 comprising a movable electrode 92a and a fixed electrode 91a is provided between the main circuit opening / closing section 20 and the grounding opening / closing section 30. The movable electrode 92a is the tip of the movable electrode rod 92. An operating rod 94 is connected to the other end of the movable electrode rod 92 via an insulating rod 93 including an insulator 93a and shields 93b, 93b. The operation rod 94 is connected to the operation unit 63 for opening and closing the opening and closing unit 90. Further, the operation rod 94 includes the bellows 73 and the sealing member 45.
a, the insulator 55, and the sealing member 45b via the vacuum vessel 10
And is electrically insulated from the vacuum vessel 10,
It is operable while maintaining airtightness in the vacuum vessel 10. The movable electrode rod 22 of the main circuit opening / closing section 20 and the movable electrode rod 92 of the opening / closing section 90 are electrically connected by a flexible conductor 80a.

On the other hand, the fixed electrode 91a is the tip of the fixed electrode rod 91. The other end of the fixed electrode rod 91 is fixed to the vacuum vessel 10 via an insulating support 95 composed of an insulator 95a and shields 95b, 95b, and is electrically insulated from the vacuum vessel 10. Also, the fixed electrode rod 91 of the opening / closing section 90
The conductor 80 between the fixed electrode rod 31 of
It is electrically connected by b. In addition, the same parts as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the switchgear configured as described above, the electrodes 21a, 21a,
By opening the gap between the electrodes 91a and 92a of the opening / closing section 90 in addition to the gap between 22a, the withstand voltage performance can be improved.

[0066]

As described in detail above, according to the switchgear of the first invention, since the vacuum vessel is not grounded,
The potential of the vacuum vessel is a potential between the potential of each charged portion of the main circuit opening / closing section and the grounding opening / closing section, and a potential between the ground potential outside the vacuum vessel, and between the vacuum vessel and the charging section, and Each potential difference from the ground potential does not become large, so that the occurrence of a ground fault can be reduced as compared with the related art.

Further, since the main circuit switch and the ground switch are housed in a vacuum container having high insulation performance, the required insulation distance between each part can be reduced, and the size is significantly smaller than in the past. Can be realized.

Further, even when an arc short-circuit occurs inside the vacuum vessel, no explosion from the arc short-circuit can be prevented since no gas exists inside the vacuum vessel.

According to the switchgear according to the second aspect of the present invention, the main circuit opening / closing section and the grounding opening / closing section can be disposed adjacent to each other, so that the interlock between the drive mechanisms of the operation section can be simplified and the product cost can be reduced. Can be reduced.

According to the switchgear according to the third aspect of the present invention, the pair of electrodes of the main circuit opening / closing portion is housed in the insulator, so that the withstand voltage performance can be improved, and the size of the insulator can be improved. , While the vacuum vessel can be made smaller. When the vacuum container is formed by pressing, the drawing depth is reduced, and the manufacturing cost of the vacuum container can be reduced.

According to the switchgear of the fourth aspect, since the arc shield and the vacuum vessel are electrically insulated, a discharge is generated from the pair of electrodes of the main circuit switch to the arc shield. In addition, the vacuum vessel does not have a high potential, and the withstand voltage performance can be improved.

According to the switchgear according to the fifth aspect of the present invention, the fixed portion of the main circuit opening / closing portion of the flexible conductor on the movable electrode side is larger than the outer diameter of the insulating rod. And it is possible to prevent metal vapor from the main circuit opening / closing portion from adhering to the insulating rod.

According to the switchgear according to the sixth aspect of the present invention, the insulating rod and the pair of electrodes of the grounding opening / closing part are respectively disposed inside the insulator, so that the withstand voltage performance can be further improved.

According to the switchgear according to the seventh aspect of the present invention, the bus side and the load side can be brought into contact with and separated from each other not only by the main circuit opening / closing section but also by the pair of electrodes provided in the middle of the flexible conductor. Therefore, the present invention has an excellent effect such that the withstand voltage performance can be further improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a configuration of a main part of a switchgear according to a first embodiment of the present invention.

FIG. 2 is a top view showing a configuration of a main part of the switchgear according to the first embodiment of the present invention.

FIG. 3 is a side view showing a configuration of a main part of the switchgear according to the first embodiment of the present invention.

FIG. 4 is a front sectional view showing a configuration of a main part of a second embodiment of the switchgear according to the present invention.

FIG. 5 is a top view showing a configuration of a main part of a second embodiment of the switchgear according to the present invention.

FIG. 6 is a side view showing a configuration of a main part of a second embodiment of the switchgear according to the present invention.

FIG. 7 is a front sectional view showing a configuration of a main part of a third embodiment of the switchgear according to the present invention.

FIG. 8 is a side view illustrating a configuration of a main part of a third embodiment of the switchgear according to the present invention.

FIG. 9 is a front sectional view showing a configuration of a main part of a fourth embodiment of the switchgear according to the present invention.

FIG. 10 is a front sectional view showing a configuration of a main part of a fifth embodiment of the switchgear according to the present invention.

FIG. 11 is a front sectional view showing a configuration of a main part of a sixth embodiment of the switchgear according to the present invention.

FIG. 12 is a front sectional view showing a configuration of a main part of a seventh embodiment of the switchgear according to the present invention.

FIG. 13 is a plan sectional view showing a configuration of a main part of a conventional switchgear.

FIG. 14 is an electrical connection diagram of a conventional switchgear.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Vacuum container, 20 main circuit opening / closing part, 21 fixed electrode rod, 21a fixed electrode, 22 movable electrode rod, 22a movable electrode, 23 insulating rod, 23a insulating material, 23b
Shield, 24 operation rods, 26 arc shield, 30
Grounding switch, 31 fixed electrode rod, 31a fixed electrode,
32 movable electrode rod, 32a movable electrode, 41a-44
a, 41b-44b sealing member, 51-55 insulator,
51a-54a, 51b, 53b Ring, 61-63
Operation part, 71, 72 bellows, 80 flexible conductor,
81a, 81b conductor plate, 91a fixed electrode, 92a
Movable electrode.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshifumi Sato 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Seiichi Miyamoto 2- 2-3 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Minoru Kobayashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5G017 AA23 BB01 BB03 5G026 EA04 EB01 EB04

Claims (7)

[Claims] 1. A main circuit opening / closing section for connecting / disconnecting a fixed electrode connected to one of a bus-side conductor or a load-side conductor and a movable electrode connected to the other, a fixed electrode connected to one of the load-side conductor or a grounding conductor, and the other. And a grounding opening / closing part for moving and detaching the movable electrode connected to the switch, and a vacuum vessel to be electrically insulated from a ground potential. 2. The switchgear according to claim 1, further comprising two operation units for operating the main circuit switching unit and the grounding switching unit, respectively, and the two operation units are provided in parallel on the outer peripheral surface of the vacuum vessel. 3. The switch according to claim 1, wherein the pair of electrodes of the main circuit opening / closing section are disposed inside an insulator for electrically insulating the fixed side of the main circuit opening / closing section from the vacuum vessel. gear. 4. The switchgear according to claim 1, wherein an arc shield disposed around an electrode of the main circuit opening / closing section is electrically insulated from the vacuum vessel. 5. A main circuit switch connected to a load-side electrode,
An insulating rod provided with a metal shield for electric field relaxation is electrically connected to respective load-side electrodes of the main circuit switching unit and the grounding switching unit. The switchgear according to any one of claims 1 to 4, further comprising a flexible conductor having a size larger than an outer diameter. 6. An insulated rod of a main circuit opening / closing portion is disposed inside an insulator for electrically insulating a movable side of the main circuit opening / closing portion from a vacuum vessel, and a pair of electrodes of a grounding opening / closing portion are connected to a ground opening / closing portion. The switchgear according to any one of claims 1 to 5, wherein the switchgear is disposed inside an insulator for electrically insulating the movable side of the unit from the vacuum vessel. 7. A flexible conductor for electrically connecting the load-side electrodes of the main circuit switching unit and the grounding switching unit with a pair of electrodes which can be connected and separated in the middle of the flexible conductor. The switchgear according to 1.