JP2001008316A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure insulation characteristics not lower than those obtained by using SF6 gas without using SF6 gas and reduce the dimensions of a switchgear as a whole. SOLUTION: A switchgear has switching apparatuses in an enclosed grounded container 10 to compose an electric system and connection units 21a-21c, to which exposed metal parts of main circuit conductors 36 are connected and which are provided for respective phases. The connection units 21a-21c provided for respective phases are supported and fixed on fixing parts 31 in the grounded container 10 by supporting structural elements 29a-29c, so as to have the longitudinal direction of the main circuit conductors 36 connected to the respective connection units 21a-21c which are approximately in prallel with each other, and to have the directions of the connection units arranged in a direction approximately perpendicular to the longitudinal direction of the main circuit conductor 36. Insulators 39 are provided for the respective connection units 21a-21c so as to be arranged between the adjacent connection units (21a and 21b) and (21b and 21c), and between the grounded container 10 and the connection units 21a and 21c facing the inner wall of the grounded container 10 so as to be arranged in directions approximately perpendicular to the directions of the connection units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a switchgear housing a device for protecting and adjusting a power supply.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing an example of this type of conventionally used switchgear.

That is, the switch gear 50 conventionally used is housed in a container 51 made of a mild steel plate.
And a bus room 54.

A circuit breaker chamber 53 located in front of the switch gear 50 has a circuit breaker 55 in which a vacuum valve is mounted. The busbar chamber 54 located behind the switchgear 50 is connected to upper and lower portions of a circuit breaker 55 via connection conductors 58a and 58b, respectively.
6a and 56b.

The partition 52 has a through hole (not shown) in which insulating spacers 59a and 59b shielded by an insulating layer can be provided, and the insulating spacers 59a and 59b are arranged in the through holes. .

The insulating spacers 59a and 59b have holes through which the connection conductors 58a and 58b can pass. That is, in this type of switchgear 50, the circuit breaker chamber 53 and the busbar chamber 54 are physically separated by penetrating the connection conductors 58a and 58b through these holes, and the connection on the electric circuit is performed. I have.

On the other hand, the disconnecting switch 56a
Is connected via a connection conductor 58c to a busbar device 61 fixed on the support insulator 60, and the busbar device 61 is connected to another power supply panel or the like. FIG. 7 shows a configuration of a switchgear provided with three-phase bus devices 61a, 61b, and 61c.

The disconnector 56b is connected to the power cable 62
Is connected to the cable head 63 which has received the power via the connection conductor 58d.

[0009] and circuit breaker compartment 53 and the bus chamber 54, for example, an insulating gas such as SF ₆ gas is sealed. SF ₆
The gas is a colorless, harmless, inert gas,
At atmospheric gas pressure, it has a dielectric strength 2-3 times that of air.

[0010] Thus, the conventional switch gear 50 is because of the use of SF ₆ gas having excellent insulation characteristics, for example, as disclosed in JP Kaimei 60-210107, reduction in overall shape is achieved ing.

[0011]

However, such a conventional switchgear has the following problems.

That is, SF ₆ gas sealed in a conventional switchgear is used in the Kyoto Conference on Global Warming Prevention (1992).
(December 1995), the effect of contributing to global warming was estimated to be about 23,000 times that of carbon dioxide gas, so that it should not be released or released to the atmosphere. Therefore, the airtight welds between the iron plates joining the rectangular containers 51 and the cable head 6
It becomes important to verify the gas leakage of the O-ring used in the third method.

Further, when the gas is released during the inspection of the inside of the container 51 or the like, it is necessary to collect the enclosed gas with a gas recovery machine before the gas is released. Although these have naturally been performed in the past, their importance has recently been further increased due to the above-mentioned reasons, and thorough measures have been required.

[0014] Without the use of SF ₆ gas, but such correspondence is not required, there is no insulation medium over the SF ₆ gas, that inevitably using SF ₆ gas is at present in the current situation .

For example, if air is used as the insulating medium instead of SF ₆ gas, the dielectric strength decreases, so that the distance between the adjacent bus device 61 and the other phase must be increased accordingly. It becomes large. This will be described with reference to FIG.

FIG. 8 is an enlarged sectional view showing an example of the configuration of a conventionally used switchgear bus device.
Three-phase bus devices 61a, 61b, 61c corresponding to FIG.
Is shown.

A connecting portion 75 of a bus 72 as a main circuit conductor is fixed for each phase to a bushing 71 fixed to a panel wall 70, and the bus 72 is fixed to a center conductor 73 by a bolt 74.
Further, an insulating cover 76 formed by, for example, sol molding with PVC is attached to the connection portion 75.

At the connecting portion 75, the insulating property is locally reduced because a part of the bus bar 72 is exposed. Therefore, the connecting portion 75 is supplemented by covering the connecting portion 75 with an insulating cover 76.
The insulating property with the connection part 75 of the adjacent phase is maintained.

Such a configuration of the bus device 61 is disclosed in Japanese Utility Model Laid-Open Publication No. 1-180108, and the energizing current can be selected by increasing or decreasing the number of buses 72 of each phase. In addition, an insulating layer is formed so as to wrap the connection portion 75 with a relatively flexible insulating cover 76 to improve the insulating characteristics.

However, since the insulating cover 76 has an insulating thickness of several mm due to the sol molding, it is not possible to expect a great improvement in the insulating properties. Further, the improvement of the dielectric strength can only be expected until the insulation cover 76 breaks down, and the applicable range is limited.

For example, if the dielectric strength of the insulating cover 76 is 29 kV / mm of impulse voltage, it is 6 mm for a thickness of 3 mm.
It has a dielectric strength of 0 kV and can be applied up to the rated voltage of 6 kV class. For reference, 200k for 33kV class
V dielectric strength is required.

From these facts, the bus device 61 of the switchgear when the air insulation is used without using SF ₆ gas.
It is necessary to reduce the electric field stress applied to the insulating cover 76 by widening the air gap with the connection part 75 of the adjacent phase. Also, the creepage distance between the ground and the ground in the direction of the board wall 70 must be sufficiently large in accordance with the dielectric strength of the insulating cover 76.

As a result, the switchgear in the case of air insulation without using SF ₆ gas has a panel width (width in FIG. 8) of the busbar device 61 of 2-3 when the SF ₆ gas is used. However, there is a problem that the size of the switch gear becomes large and the overall shape of the switchgear becomes large.

[0024] The present invention has been made in view of such circumstances, without the use of SF ₆ gas, to ensure equal or insulating characteristics in the case of using a SF ₆ gas, the reduction of the overall shape It is an object of the present invention to provide a switchgear capable of realizing a switch.

[0025]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, according to the first aspect of the present invention, various switching devices are housed in a sealed grounding container to constitute a power supply system, and a connecting portion in which a metal exposed portion of a main circuit conductor is electrically connected. In the switchgear provided for each phase, the connecting portions provided for each phase are arranged on the fixed portion in the grounding container, and the length directions of the main circuit conductors connected to the respective connecting portions are substantially parallel. As described above, and supported and fixed by the support structure material in the connection direction substantially perpendicular to the length direction of the main circuit conductor, between the adjacently disposed connection portions, and facing the grounding container and the inner wall of the grounding container. An insulator is provided in each of the connection portions between the connection portion and the insulator so as to be substantially orthogonal to the connection direction.

Therefore, in the switchgear according to the first aspect of the present invention, a partition effect between the phases occurs, and the insulating properties between the phases are improved.

According to a second aspect of the present invention, in the switchgear according to the first aspect, each connection portion includes a plurality of insulators at substantially equal intervals and is provided at connection portions that are arranged adjacent to each other. The distance between the outermost insulators in the connecting portion direction is made substantially equal.

Therefore, in the switchgear according to the second aspect of the present invention, since the potential sharing between the main circuit conductor and the insulator and between the insulators is equalized, the insulation characteristics are improved by the step insulation.

According to a third aspect of the present invention, in the switchgear according to the first aspect, the supporting structure is a long structural material having a projection in a circumferential direction, and the insulator is substantially orthogonal to the connecting portion. The line extended in the direction to intersect the projection.

Therefore, in the switchgear according to the third aspect of the invention, the insulator between the main circuit conductor and the structural material supporting and fixing the main circuit conductor in the height direction are provided in the insulator and the structural material. It rises by a synergistic effect with the projected portion.

According to a fourth aspect of the present invention, in the switchgear according to the first aspect, the distance between the insulator and the main circuit conductor connected to each connection portion is set along the length direction of the main circuit conductor. , As the distance from the center of the connection increases.

Therefore, in the switchgear according to the fourth aspect of the present invention, the insulating effect is substantially the same over the connecting portion, so that the insulating characteristics of the entire connecting portion are improved.

According to a fifth aspect of the present invention, in the switchgear according to the first aspect, the insulator is formed of an insulating material having a higher dielectric constant than the supporting structure material.

Therefore, in the switchgear according to the fifth aspect of the present invention, the electric charge is easily charged on the surface of the insulator, and the electric potential is shared between the electrode and the insulator and between the insulators, thereby improving the insulation characteristics. .

According to a sixth aspect of the present invention, in the switchgear according to the second aspect, the heights of the respective connection portions from above the fixed portion are made substantially equal.

Therefore, in the switchgear according to the sixth aspect of the present invention, the connecting portions of each phase are arranged in a horizontal line, and the insulating effect obtained in the second aspect can be further enhanced.

According to a seventh aspect of the present invention, in the switchgear according to any one of the first to sixth aspects, at least the insulator is sealed with dry air.

Therefore, in the switchgear according to the seventh aspect of the present invention, stable insulation characteristics can be obtained by enclosing dry air.

According to the invention of claim 8, in the switchgear according to any one of claims 1 to 6, at least the insulator is sealed with nitrogen gas.

Therefore, in the switchgear according to the eighth aspect of the present invention, a stable insulation characteristic can be obtained by sealing the nitrogen gas.

According to the ninth aspect of the present invention, various switchgears are housed in a sealed grounding container to constitute a power supply system, and a connection portion where the metal exposed portion of the main circuit conductor is electrically connected is connected to the power supply system. In the switchgear provided for each, the connecting portion provided for each phase is supported and fixed by a supporting fixing material on the fixing portion in the grounding container, and at least one of the connecting portions is connected to the fixing wall from the fixing wall. The height is different from the height of the connection part of the other phase from the fixed part.

Therefore, in the switchgear of the ninth aspect, for example, in the case of three phases, the mutual arrangement of the connection parts of each of the three phases is a triangular arrangement or an oblique arrangement, so that the connection parts of the adjacent phases are connected to each other. The insulating properties of the device are improved.

According to the tenth aspect of the present invention, various switchgears are housed in a hermetically sealed grounding container to constitute a power supply system, and a connection portion where a metal exposed portion of the main circuit conductor is electrically connected is connected. In the switchgear provided for each, the connecting portions are supported and fixed by the supporting and fixing members, and the center portions of the cross sections of the supporting and fixing members of the respective connecting portions are aligned with each other, and the connecting portions are arranged in a vertical line.

Therefore, in the switchgear according to the tenth aspect of the present invention, since the connecting portions of different phases are arranged in a vertical line, the panel width of the bus device in which the connecting portions are arranged can be minimized.

[0046]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a configuration diagram showing an example of the overall configuration of a switchgear according to an embodiment of the present invention.

The switchgear according to the present invention can be used as a collective device, a switchgear, a circuit breaker, a disconnecting switch, etc., which are used indoors and outdoors, and a control / measurement device, a protection / adjustment device and the like related thereto. Wiring for assembling and supporting,
It is generally widely used including a storage box, a frame, a support structure, an enclosure, and the like, and a detailed description thereof will be omitted here.

As shown in FIG. 1, the switchgear according to the embodiment of the present invention is housed in a grounded container 10, and the container 10 further includes a lower power receiving chamber 13 and a middle disconnector chamber. 14 and an upper-stage bus chamber 15.

The power receiving chamber 13 has a T-shaped cable head 18 fixed to a side wall. The cable head 18 is connected to a vacuum valve 19 which is a circuit breaker.
Is the disconnector 20 of the disconnector chamber 14 via the insulating spacer 26.
Is connected to Further, the disconnector 20 is connected to the three-phase bus devices 21a, 21b, 21c of the bus chamber 15, respectively. A lightning arrester 22 is connected to the cable head 18.

The movable electrode on the lower side of the vacuum valve 19 is connected to an insulating operation rod 24 via a contact 23. The insulating operation rod 24 is further directly connected to the operation mechanism 25 and opens and closes a contact (not shown) in the vacuum valve 19.

The fixed electrode side in the upper direction of the vacuum valve 19 is connected to the disconnecting switch 20 via the insulating spacer 26. The insulating spacer 26 divides the power receiving chamber 13 and the disconnector chamber 14.

The disconnecting switch 20 is composed of, for example, a switch using a vacuum valve, and is connected to an operating mechanism 28 directly connected to the operating shaft 27. The operation mechanism 28 is connected to the disconnector 20.
(Not shown) is opened and closed.

The bushings 29a, 29b, 29 respectively
c three-phase bus device 21a supported and fixed by c,
Reference numerals 21b and 21c are used to connect to another power panel or the like.

Dry air is sealed in the sealed container 10 at a positive pressure higher than the atmospheric pressure in order to prevent inflow of external air.

The control device 30 displays the operating states of the vacuum valve 19 and the disconnector 20 which are circuit breakers.

FIG. 2 is an enlarged sectional view showing an example of the configuration of the bus device of the switchgear according to the present embodiment.

That is, the switchgear bus devices 21a, 21b, 21c according to the present embodiment are arranged in the bus chamber 15 in which the switchgear is housed. These three bus devices 21a, 21b, 21c are provided for each phase.

A bushing 29 made of a round bar and provided with an insulating layer 33 around a central conductor 32 is fixed to a partition wall 31 separating the busbar chamber 15 and the disconnector chamber 14 with bolts 34. The tip of the center conductor 32 is formed into a conductor 35 having a rectangular cross section, and busbars 36 are provided on both sides of the conductor 35.
a and the busbar 36b are fixed with bolts 37, respectively.

The number of buses 36 fixed to each bus device 21a, 21b, 21c increases or decreases in accordance with the supplied current.
For example, the number is one at a conduction current of 1250 A and two at 2500 A. In FIG. 2, each bus device 21a, 21b, 2
1c shows a state where two buses, that is, a bus 36a and a bus 36b, are fixed.

Further, the insulating cover 38 is fixed to the upper part of the conductor 35 by the bolts 40 so that the busbars 36 a and 36 b cover the connection part fixed by the bolts 37.

The insulating cover 38 includes a plurality of insulating barriers 3.
9a and 39b are provided. These insulating barriers 39a, 3
9b is an adjacent bus device 21 (for example, the bus device 21a
And the bus device 21b, and the bus device 21b and the bus device 21c).
Between the busbars 36 fixed to each other, between the busbar devices 21a and 21c disposed adjacent to the wall surface of the container 10, and the container 10, so as to be orthogonal to the directions.

As will be described later, the bus 36 and the bus 36
Are in the same polarity. In addition, the bus 36 of the adjacent phase and the insulating barriers 39a and 39b covering the bus 36 have opposite polarities. In the case of the phase adjacent to the inner wall surface of the container 10, the container 10 also has the opposite polarity. The meaning of the arrangement so as to be orthogonal means the arrangement so as to be orthogonal to the above-described direction from the same polarity to the opposite polarity (or from the opposite polarity to the same polarity).

The insulating barriers 39a and 39b are connected to the bus 3
6 and the inside insulating barrier 39a, and the gap G between the inside insulating barrier 39a and the outside insulating barrier 39b are arranged to be substantially the same gap G.

Further, the busbar device 2 of the phase adjacent to the container 10
Outer insulating barrier 39b and container 1 in 1a, 21c
0, the adjacent bus device 21 (for example, the bus device 2
1a and bus device 21b, bus device 21b and bus device 21
c) The gaps between the outer insulating barriers 39b are arranged so that the gaps W are substantially the same.

The insulating barriers 39a and 39b have an insulating layer 3
A material having a dielectric constant higher than 3 is used. As a result, the specific capacity per unit area increases, and the charging of the surface becomes more uniform. The dielectric constant can be easily increased by, for example, mixing a filler such as alumina with an epoxy resin. Since the insulating barriers 39a and 39b do not require a large mechanical strength, there is no concern about a decrease in the mechanical strength due to the mixing of the filler.

Further, dry air is sealed in the switch gear. In the bus device 21 based on the composite insulation of the solid insulation and the air insulation as shown in the present embodiment, the insulation properties are easily affected by moisture on the surface of the insulator. 3g absolute humidity
By enclosing dry air of / m ³ or less, the insulating properties are not affected by humidity. Even with the use of N ₂ gas (nitrogen gas), stable composite insulation properties can be obtained as with dry air.

The outer insulating barrier 39 b is provided to the extent that it intersects the outermost diameter of the disk-shaped fold 45 a provided on the insulating layer 33 at right angles.

FIG. 3 is a plan view showing an example of the configuration of the insulating cover as described above.

As shown in FIG. 3, the insulating cover 38 covers the radial direction of the connecting portion to which the busbar 36 is fixed by the bolt 40 with insulating barriers 39a, 39b, 39c. Although the width is large, the width of the insulating barrier 39b is gradually reduced toward the end of the connection portion.

In FIG. 3, an insulating barrier in a portion where the width becomes narrower toward the end of the connection portion, that is, an insulating barrier obliquely oblique to the bus bar 36 is particularly distinguished as an insulating barrier 39c.

As described above, in the bus device 21, the entire connecting portion to which the bus is connected is connected to the insulating barriers 39 a and 39.
b, 39c cover.

Next, the operation of the switchgear according to the present embodiment configured as described above will be described.

In the switchgear having the above-described configuration, the insulating cover 38 is not fixed to the container 10 serving as the ground electrode. When a certain electric field is reached, the emitted electrons form an insulating barrier 39.
a, 39b easily become trapped. When electrons are trapped, the insulating barriers 39a and 39b become charged. In general, charging is unlikely to occur uniformly, but when there is no ground electrode,
Since the charges are sufficiently accumulated, the insulating barriers 39a, 39
b is an insulator having a uniform charge on the surface.

The insulating barriers 39a and 39b have the same polarity as the bus 36. On the other hand, the polarity is opposite to that of the bus 36 or the container 10 at the connection portion of the adjacent bus device 21. Therefore, between the busbars 36 at the connection part of the adjacent busbar device 21 and between the container 10 and the busbar 36, the insulating barrier 3
The potential is shared between 9a and 39b. Adjacent bus device 21
Since the gap between the insulating barriers 39b outside the connecting portion of the container 10 and the gap between the insulating barrier 39b outside the busbar devices 21a and 21c arranged on the inner wall side of the container 10 and the container 10 are both gaps W, Almost equal potential distribution among them.

That is, the potential distribution among these components is as follows:
Since the electric field is an unequal electric field except for an equal electric field like a parallel plate electrode, a lot of potentials are shared on the side of the bus 36 and the like, but the potential sharing is improved by the insulating barriers 39a and 39b.

The bus 36 and the inner insulating barrier 39a
Is the same as the gap G between the inner insulating barrier 39a and the outer insulating barrier 39b. Therefore, the inner insulating barrier 39a and the outer insulating barrier 39b
Similarly, between them, the electrodes become apparently parallel flat electrodes, and the gap becomes a step insulation, so that the insulation characteristics are greatly improved.

In particular, as shown in FIG. 2, in a configuration in which the bus devices 21a, 21b, 21c of a plurality of phases are all arranged in a horizontal line, the effect of the insulating barriers 39a, 39b is greatly increased.
The gap W between the busbar devices 21 can be reduced, and the switchgear can be reduced.

By forming a uniform electric field by such an apparent parallel plate electrode, the insulation characteristics are improved. This effect is particularly large in a region where the gap W is relatively small. That is, the necessary gap W in the air insulation
Is 300 mm in a rated voltage class of 33 kV, and has a gap W in a composite insulating configuration of insulating barriers 39a and 39b.
Is set to about 100 mm, the insulation characteristics are greatly improved.

This is almost the same as the insulation characteristics at substantially atmospheric pressure of SF ₆ gas insulation using a connection similar to the connection used in the composite insulation configuration. That is, the gap W is 100 mm
Below this level, downsizing similar to SF ₆ gas insulation can be achieved.

If the switchgear has a margin in arrangement, only the outer insulating barrier 39b may be provided.

The folds 45a and 45b of the insulating layer are formed in a disk shape in conformity with the insulating layer 33.
a, 45b so as to be orthogonal to the outermost diameter portion.
Since b is provided, the insulation characteristics are improved in the partition 31 direction. The folds 45a and 45b of the insulating layer are
Since a non-uniform electric field is generated on the side, trapping electrons emitted by the electric field is more likely to occur when the electric field is provided on the upper side, and the effect of improving the insulating properties is increased. Further, if the number of folds of the insulating layer is increased, the height of the bushing 29 can be reduced.

Further, the oblique insulating barrier 39c provides
Since the connection portion of the busbar 36 can be covered while maintaining a substantially uniform gap, the insulating barriers 39a, 39b, 39c
The whole partition effect, that is, the effect of preventing the movement of electrons by the insulating barrier and improving the insulating properties is enhanced.

As described above, in the switchgear of the present embodiment, a plurality of insulating barriers are provided in the gap between the connection portion to which the bus is connected in the bus device and the ground between the connection portions, and the insulation at the same connection portion is provided. The distance between barriers,
In addition, the intervals between the outermost peripheral insulating barriers of the adjacent connecting portions (in the direction adjacent to the inner surface of the grounding container, the intervals between the outermost peripheral insulating barrier of the connecting portion and the inner wall of the grounding container) are arranged at substantially equal intervals. ing.

As a result, these gaps become apparently equal electric fields, and the gaps become step-insulated by the insulating barrier, so that the electric field is greatly improved and the insulating characteristics can be remarkably improved.

[0087] As a result, without the use of SF ₆ gas, to ensure more insulating properties comparable with SF ₆ gas, it is possible to reduce the overall shape.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS.

The switchgear according to the second embodiment of the present invention has the same configuration as the switchgear of the first embodiment except for the configuration of the busbar device. Therefore, description of the entire configuration of the switchgear will be omitted, and only the configuration of the busbar device will be described.

FIG. 4 is an enlarged sectional view showing an example of the configuration of the bus device of the switchgear according to the embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing a modification of the configuration of the bus device of the switchgear according to the embodiment of the present invention.

In FIGS. 4 and 5, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described here.

That is, the configuration of the bus device of the switchgear according to the present embodiment is, as shown in FIG.
The first embodiment differs from the first embodiment only in that the mid-phase bus device 21b of 1a, 21b, 21c is higher than the bi-phase bus devices 21a, 21c.

The insulating cover 38 includes a plurality of insulating barriers 39.
a, 39b. Bolts 40 draw and secure the insulating cover 38 to the conductor 3. Insulation barrier 39a, 39b
The arrangement relation between the ridges 45a and 45b of the insulating layer is the same as that of FIG.

Next, the operation of the switchgear to which the bus device configured as described above is applied will be described.

As described above, in the switchgear according to the present embodiment, each bus device 21a, 21b, 21
The mutual relationship between the buses 36 connected to c is triangular.
Such a triangular arrangement is used for each bus device 2 as shown in FIG.
Compared to the case where the heights of 1a, 21b, and 21c are the same, the separation distance between the buses 36 on the adjacent bus devices 21 can be ensured. 21b, the busbar device 21
(between b and the busbar device 21c) can be reduced.

Note that, contrary to the configuration of FIG. 4, the bus device 21b of the middle phase is lowered, and the bus devices 21a and 21c of the two-phases are lowered.
The same effect can be obtained even when is increased. Further, as shown in FIG. 5, the bus devices 21a, 21b, 21
The configuration may be such that the height of c increases in order. In this case, since the arrangement relationship of the three-phase buses 36 is oblique, an empty space is created at the corner of the container 10 and the control device 30
You will be able to attach such things.

As described above, in the switchgear according to the present embodiment, the separation distance between the three-phase buses can be further secured, so that the switchgear according to the first embodiment can be used without using SF ₆ gas. Can further reduce the overall shape.

Further, particularly in the case of a bus device having a configuration in which the heights of the three-phase buses are continuously different, a control device can be arranged in the bus room, so that the switch gear can be further reduced in size. It becomes possible to plan.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG.

The configuration of the switchgear according to the third embodiment of the present invention is the same as that of the switchgear of the first embodiment except for the configuration of the busbar device. Therefore, description of the entire configuration of the switchgear will be omitted, and only the configuration of the busbar device will be described.

FIG. 6 is an enlarged sectional view showing an example of the configuration of the switchgear busbar device according to the embodiment of the present invention. Here, only the different parts will be described.

The configuration of the switchgear bus device 21 according to the present embodiment is such that the cylindrical centers of the bushings 29a, 29b, 29c are the same, and the three-phase bus devices 21a, 21b,
The only difference from the first embodiment is that 21c are arranged in a vertical line.

As described above, in the switchgear of the present embodiment, the board width of the entire busbar device 21 can be minimized, so that the buswidth of the busbar device 21 can be reduced without using SF ₆ gas. It is possible to realize a reduced switch gear. This effect increases as the number of switch gears arranged side by side increases.

The fixing portion, the support structure material,
The insulator and the protrusion correspond to the partition 31, the bushing 29, the insulating barrier 39, and the fold 45 in each of the above embodiments. Further, the connection part in the claims corresponds to a part where the bus 36 as a main circuit conductor is connected in the bus devices 21a, 21b, and 21c described in each of the above embodiments.

[0106]

As described in the foregoing, according to the switch gear of the present invention, without the use of SF ₆ gas, SF ₆
As a result, it is possible to secure the same or higher insulating properties as in the case of using gas and to reduce the overall shape.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an overall configuration of a switchgear according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an example of a configuration of a bus device of the switchgear according to the first embodiment of the present invention.

FIG. 3 is a plan view showing an example of the configuration of the insulating cover of the switchgear according to the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing an example of a configuration of a bus device of a switchgear according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing a modified example of the configuration of the bus device of the switchgear according to the second embodiment of the present invention.

FIG. 6 is an enlarged sectional view showing an example of a configuration of a bus device of a switchgear according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventionally used switchgear.

FIG. 8 is an enlarged sectional view showing an example of the configuration of a conventionally used switchgear bus device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Container, 13 ... Power receiving room, 14 ... Disconnector room, 15 ... Bus room, 18 ... Cable head, 19 ... Vacuum valve, 20 ... Disconnector, 21 ... Bus device, 22 ... Lightning arrester, 23 ... Contact, 24 ... Insulated operating rod, 25, 28 Operating mechanism, 26 ... Insulating spacer, 27 ... Operation shaft, 29 ... Bushing, 30 ... Control device, 31 ... Partition wall, 32 ... Center conductor, 33 ... Insulating layer, 34, 37, 40 ... bolt, 35 ... conductor, 36 ... busbar, 38 ... insulating cover, 39 ... insulating barrier, 45 ... fold.

Claims (10)

[Claims] 1. A switch comprising: a power supply system in which various switching devices are housed in a sealed grounded container; and a phase-by-phase connection portion to which a metal exposed portion of a main circuit conductor is electrically connected. In the gear, the connecting portion provided for each phase, on the fixed portion in the grounding container, so that the length direction of the main circuit conductor connected to each connecting portion is substantially parallel, and The main circuit conductor is supported and fixed by a support structure material in a connection direction substantially perpendicular to the length direction of the main circuit conductor, between the adjacently disposed connection portions, and facing the grounding container and the inner wall of the grounding container. A switchgear, wherein each of the connection portions is provided with an insulator disposed between the connection portion and the connection portion so as to be substantially orthogonal to the direction of the connection portion. 2. The switchgear according to claim 1, wherein each of said connecting portions includes a plurality of said insulators at substantially equal intervals, and is provided at said connecting portions which are arranged adjacent to each other. A switchgear, wherein the distance between the insulators on the outermost side in the direction of the connecting portion is substantially equal. 3. The switchgear according to claim 1, wherein the supporting structural member is a long structural member having a protrusion in a circumferential direction, and the insulating member is arranged in a direction substantially orthogonal to the connecting portion direction. A switch gear, characterized in that a line extended from the above intersects the projection. 4. The switchgear according to claim 1, wherein a distance between the insulator connected to each of the connection portions and the main circuit conductor is set along a length direction of the main circuit conductor. A switchgear, wherein the distance from the center of the connecting portion is reduced. 5. The switch gear according to claim 1, wherein the insulator is formed of an insulating material having a higher dielectric constant than the supporting structure. 6. The switchgear according to claim 2, wherein the heights of the respective connection portions from above the fixed portion are substantially equal. 7. The switchgear according to claim 1, wherein at least the insulator is sealed with dry air. 8. The switch gear according to claim 1, wherein at least the insulator is sealed with nitrogen gas. 9. A switch comprising: a power supply system in which various switching devices are housed in a sealed grounding container; and a connection unit for each phase, to which a metal exposed portion of a main circuit conductor is electrically connected. In the gear, the connection portion provided for each phase is supported and fixed on a fixing portion in the grounding container by a support fixing material, and among the connection portions, at least one phase of the connection portion from the fixing wall. A switch gear, wherein the height is different from the height of the connection part of the other phase from the fixed part. 10. A switch comprising: a power supply system in which various switching devices are housed in a sealed grounding container; and a connection unit for each phase, to which a metal exposed portion of a main circuit conductor is electrically connected. A switch, wherein the connection portions are supported and fixed by a support fixing material, and the connection center portions of the support fixing materials of the respective connection portions are aligned with each other, and the connection portions are arranged in a vertical line. gear.