JP2001057716A - Switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a shape as a whole by making compound the functions that each equipment has. SOLUTION: In this switch gear for composing a power supply system by accommodating each kind of switch, such as a circuit breaker and an isolator in sealed container, a vacuum valve 34 for three phases is arranged in a triangle shape and is accommodated in a cylindrical container 35, that rotates with a center axis in the axial direction as the center, power supply and load sides are led out at each 120 degrees at the outer periphery of the cylindrical container 35 regarding the main circuit conductor of the vacuum valve 34 for three phases, and a connection part 33 for making a connection to each main circuit is arranged at the outer periphery of the cylindrical container 35 opposite to the main circuit conductor of the vacuum valve 34 that has been led out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear which constitutes a power supply system by housing various switching devices such as a circuit breaker and a disconnector in a sealed container, and more particularly to a function of each device. The present invention relates to a switchgear which is combined to reduce the overall shape.

[0002]

2. Description of the Related Art FIG. 11 is a single-line diagram of a typical power supply system of this type, and FIG. 12 is a side view showing a configuration example of a conventional typical switchgear.

In FIG. 11, a main circuit receives power from a cable head CH and is connected to a circuit breaker CB via a disconnector DS and a grounding device ES.

From the circuit breaker CB, a bus BUS on the load side is connected via a disconnector DS and a grounding device ES similar to those on the power receiving side.
Connected to another board.

[0005] As shown in Fig. 12, the arrangement of these various devices is such that a container 1 whose outer periphery is surrounded by a mild steel plate and sealed is partitioned back and forth by a partition wall 2, and a circuit breaker room 1a in the front has a vacuum. The circuit breaker 3 to which the valve 3a is mounted is housed, and disconnectors 4A and 4B of the same shape are respectively provided in the rear bus room 1b according to the main circuit on the power supply side and the load side on the circuit breaker 3 side. Provided on the load side.

[0006] A bus 5 fixed to a supporting insulator 6 is connected to the disconnector 4A, and connection to an adjacent board is made.

Further, a cable head 7 which receives power from the power cable 7a is connected to the disconnector 4B.

[0008] These devices are connected to each other by a connection conductor 8.

In addition, an insulating spacer 9 in which a main circuit conductor is molded with an insulating layer in a through hole (not shown) is provided in the partition wall 2 separating the power supply side and the load side, and the mutual chambers 1a and 1b are provided.
Are connected to the main circuit.

Here, although the grounding device is not shown, the contacts provided on the grounding portion are connected to the main circuit conductor on the load side in the disconnector 4A and the main circuit conductor on the power supply side in the disconnector B, respectively. The contact is performed by linear motion.

Thus, a power supply system is formed, and power reception and power supply on the load side are performed stably.

[0012]

By the way, in the switchgear having such a configuration, the storage devices such as the circuit breaker 3 and the disconnecting switch 4 are rationally arranged by themselves having the functions of these devices. The two are connected by a connection conductor 8.

This is because, as disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 8-22124, each device requires a specific function such as shut-off or disconnection, and further, a device having individual functions. One purpose is to achieve standardization.

Another object is to be able to easily cope with a power supply configuration in which the number of disconnectors 4 and the arrangement of the buses 5 are different by combining them.

However, even if the respective devices are rationally arranged, they must be connected by the connecting conductors 8, so that the connecting conductors 8 must be arranged and a space for connecting the connecting conductors 8 must be secured.

Each device itself has a sufficient withstand voltage characteristic by sufficiently suppressing the electric field. However, at the place where the connection conductor 8 is connected, a total electric field including parts such as bolts is provided. Relaxation is required, and additional attachment of an electric field relaxation shield having a curvature at the connection is required.

Further, in a portion where each device is not linearly arranged, for example, the disconnector 4 and the insulating spacer 9 are provided.
And the connection conductor 8 must be bent. And in such a connection conductor 8,
In order to provide an appropriate curvature from electric field suppression, a space occupied by the length and width of the connection conductor 8 is required.

As described above, in each device, the shape of the connection portion becomes large, the space for mounting the connection conductor 8 is secured, and the connection conductor 8 itself becomes large.

For this reason, the overall shape of the switchgear is limited due to restrictions imposed by the arrangement of each device, and there is a limit to downsizing. And this goes against the recent trend of shrinking.

An object of the present invention is to provide a switchgear capable of reducing the overall shape by combining the functions of each device.

[0021]

In order to achieve the above object, according to the first aspect of the present invention, various power supply systems such as circuit breakers and disconnectors are housed in a sealed container. In the switch gear to be constituted, three-phase vacuum valves are arranged in a triangular shape and housed in a cylindrical container that rotates around its central axis, and the main circuit conductors of the three-phase vacuum valves are cylindrically shaped. A connection part for leading the power supply side and the load side to the outer periphery of the vessel every 120 degrees, and connecting to the main circuit on the outer periphery of the cylindrical container facing the main circuit conductor of the derived vacuum valve. Is provided.

According to the second aspect of the present invention, the first aspect is provided.
In the switch gear according to the invention, the cylindrical container housing the three-phase vacuum valves arranged in a triangular shape is rotated about the central axis in the axial direction, and the connecting portion provided on the outer periphery of the cylindrical container and the main part of the vacuum valve are rotated. The circuit conductors are connected or disconnected on the power supply side and the load side, respectively.

Therefore, in the switchgear according to the first and second aspects of the present invention, the vacuum valves are arranged in a triangular manner, and the main circuit conductors for the three phases are provided outside each other to form a connection portion. The connection and disconnection of the main circuit conductors can be performed by rotating the cylindrical container storing the container, so that the disconnection by the vacuum valve and the disconnection by rotation of the cylindrical container can be performed by the same device. Also,
In the disconnected state, the main circuit on the power supply side and the main circuit on the load side are simultaneously opened, so that a two-point gap is formed and the insulation characteristics can be improved.

According to a third aspect of the present invention, in the switch gear according to the first aspect of the present invention, a cylindrical container in which three-phase vacuum valves are arranged in a triangular arrangement is rotated about an axial center axis. The ground conductor provided in the cylindrical container is connected to a connection portion provided on the outer periphery of the cylindrical container.

Therefore, in the switchgear according to the third aspect of the present invention, the ground conductor can be connected to the main circuit on the power supply side and the load side by further rotating from the disconnected state, so that the function provided with the grounding device can be provided in the same container. Can be done at

As described above, since the functions of interrupting, disconnecting, grounding, and the like can be combined by the same device, the overall shape of the switchgear can be reduced.

On the other hand, in the invention according to claim 4, the above-mentioned claim 2
In the switchgear of the invention, the cylindrical container housing the three-phase vacuum valves in a triangular arrangement is rotated to an angle of 60 degrees starting from the connection point between the main circuit conductor of the vacuum valve and the connection portion, Each main circuit conductor is connected or disconnected.

Therefore, in the switchgear according to the fourth aspect of the present invention, by setting the angle of the cylindrical container to be rotated to 60 degrees in the disconnection function, the insulation distance of the contacts at the disconnection portion can be ensured to the maximum. Further, since a two-point gap is formed by the disconnection portions on the power supply side and the load side, the cylindrical container for housing the vacuum valve can be reduced in size.

According to the fifth aspect of the present invention, the third aspect is provided.
In the switchgear of the invention, the cylindrical container in which the three-phase vacuum valve and the ground conductor are separately housed is rotated to an angle of 40 degrees starting from the connection point between the main circuit conductor of the vacuum valve and the connection portion. Then, the respective main circuit conductors are connected or disconnected, and the cylindrical container is further rotated to an angle of 40 degrees to be connected to the ground conductor.

Therefore, in the switchgear according to the fifth aspect of the present invention, the angle of the cylindrical container to be rotated is set to 40 degrees for the disconnecting function and further to 80 degrees for the grounding function, so that the contact point of the disconnecting portion can be reduced. In addition, the maximum insulation distance between the ground electrode and the ground electrode can be ensured, and a two-point gap is formed between the power supply side electrode and the load side electrode.

According to a sixth aspect of the present invention, there is provided the switchgear according to any one of the second to fifth aspects, wherein a three-phase vacuum valve is disposed in a triangular arrangement and housed therein. The movable conductor of the vacuum valve and the container housing the operation mechanism directly connected thereto are rotated integrally.

Therefore, in the switch gear according to the sixth aspect of the present invention, the operating force of the operating mechanism is reduced by integrally rotating the cylindrical container storing the vacuum valve and the container storing the directly connected operating mechanism. Since the power can be transmitted to the contacts of the valve without loss, the operating force can be reduced.

On the other hand, according to the invention of claim 7, in a switchgear constituting a power supply system by housing various switching devices such as a circuit breaker and a disconnector in a sealed container, a main circuit device for three phases is provided. One cylindrical container in which is arranged in a triangular arrangement,
The height of the conductors connected to the main circuit device in the main circuit bus that interconnects with the other cylindrical container containing the same main circuit device arranged in a triangular arrangement, and the heights of the three phases are different from each other Thus, the main circuit bus is arranged substantially horizontally.

Therefore, in the switchgear according to the seventh aspect of the present invention, since the height of the bus is different in each phase, the insulation distance in the interphase direction can be secured, and the panel width can be reduced.

According to the invention of claim 8, the above-mentioned claim 1 is provided.
6. The switchgear according to any one of claims 5 to 5, wherein a connection portion provided to face a main circuit conductor of a vacuum valve derived from a cylindrical container in which three-phase vacuum valves are arranged in a triangular arrangement. Then, the main circuit conductors of the three-phase cable heads arranged in a horizontal row are connected to each other.

Therefore, in the switchgear according to the eighth aspect of the present invention, the main circuits from the cable heads arranged in a horizontal line to the vacuum valves arranged in a triangular arrangement can be connected in a short distance. Further, it is possible to easily connect a three-phase integrated cable or a three-phase cable stored in the same pit.

According to a ninth aspect of the present invention, in the switchgear according to any one of the first to fifth aspects, the three-phase vacuum valves are triangularly arranged and housed in a cylindrical container. The three-phase cable heads are provided in accordance with the arrangement of the connection portions and connected to the connection portions provided opposite to the main circuit conductors of the vacuum valve.

Therefore, in the switchgear according to the ninth aspect of the present invention, the cables for three phases are spread at the cable head portion at the board connection point, so that the cable head and the vacuum valve can be easily connected.

According to a tenth aspect of the present invention, in the switchgear according to any one of the first to fifth aspects, the three-phase vacuum valves are triangularly arranged and housed in a cylindrical container. The conductor of the connection portion provided opposite to the main circuit conductor of the vacuum valve is a center conductor having a substantially U-shaped opening at the tip in accordance with the region where the main circuit conductor of the vacuum valve moves horizontally, A contact is provided on the inner surface of the U-shaped opening of the center conductor, and the main circuit conductor of the vacuum valve is connected by the contact by rotating horizontally.

Therefore, in the switchgear according to the tenth aspect of the present invention, the connection can be performed by a simple rotating operation by the connecting portion having the opening in accordance with the rotating direction of the main circuit conductor, so that the width of the main circuit conductor is reduced. Can be easily changed, and the capacity can be increased.

According to an eleventh aspect of the present invention, in the switch gear according to any one of the first to fifth aspects, the three-phase vacuum valves are housed in individual insulating containers. Is set to a value of 1 or a value in the vicinity thereof.

Therefore, in the switchgear according to the eleventh aspect of the present invention, the insulation thickness of the insulating container accommodating the vacuum valve and the gap from the insulating container to the vacuum valve are substantially the same, thereby optimizing the electric field. Since the withstand voltage is improved, the insulation container, the insulation distance, and the like can be reduced.

According to a twelfth aspect of the present invention, in the switchgear according to the eleventh aspect, a conductive paint layer is provided as a ground layer on an outer surface of the insulating container accommodating each of the vacuum valves. An arc-shaped curved portion is provided at the end so as to surround the ground layer, and the inner surfaces of the curved portion are arranged so as to face each other at the ends of the ground layer at both ends, and are fixed to a metal box housing the insulating container. The contact plate is brought into contact with the ground layer.

Therefore, in the switchgear according to the twelfth aspect, the electric field at the end of the ground layer provided outside the insulating container accommodating the vacuum valve can be reduced, so that the insulating thickness and creepage distance of the insulating container can be reduced. Can be

[0045]

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

(First Embodiment) FIG. 1 is a side view showing a configuration example of a switchgear according to the present embodiment.

In FIG. 1, a cable head 11 in which three phases are mounted in a horizontal row on a side surface of a rectangular box 10.
A power cable 11a is connected to the power supply, and power is received. The cable head 11 is connected to a vacuum valve 12 in which three phases are arranged in a triangular arrangement.

This connection is made by a contact 14 provided on the conductor 13 on the cable head 11 side and a conductor 15 provided on the vacuum valve 12 side. , And are arranged in a triangular arrangement so as to face the vacuum valve section 12.

On the other hand, the vacuum valve section 12 is housed in a cylindrical container 16 and is provided in a triangular arrangement every 120 degrees. An operation mechanism section 17 is provided below the container 16. The movable side 18 of the vacuum valve section 12 is connected to the movable side 18 by an insulating rod 19.
The internal electrodes are opened and closed.

The fixed conductor 20 includes a connecting conductor 21.
Are fixed to the insulating support plate 22 in accordance with the triangular arrangement of the vacuum valve section 12.

Further, the connecting conductor 21 is connected to the contact 24 of the connecting portion 23 fixed to the box 10 and the respective busbars 26a, 26b, 2 fixed to the partition plate 25.
6c.

The buses 26a, 26b, 26c are connected to the central conductors 27a, 27b, 27c by insulating layers 28a, 28b,
28c are provided, the heights of the three phases are different from each other, and connection to adjacent boards is performed by connecting buses 29a, 29b, 29c.

Here, the operating mechanism section 17 and the vacuum valve section 1
2, the connection conductors 13, 21 and the like are rotated by an operation mechanism 30 that integrally rotates.

Reference numeral 31 denotes an arrester connected to the main circuit of the cable head 11.

FIG. 2 is a sectional view showing an example of a connection state from the power receiving point cable head 11 to the load-side bus portion 26 in the switchgear having the configuration shown in FIG.

In FIG. 2, a cable head 1 for three phases is provided.
1a, 11b, and 11c are attached to the box body 10 in a horizontal single row arrangement, and the cable heads 11a, 11c at both ends are provided.
Are connected to the connecting portions 33a and 33c by insulated conductors 32a and 32c provided on the side surface of the box 10.

The medium-phase cable head 11b is connected to the connection portion 33b by a short insulated conductor 32b.

For this reason, the connection parts 33a, 33b, 33c
Are arranged in a triangular arrangement, and rotating vacuum valve portions 34a, 34b, 34c are provided opposite to them.

The vacuum valve portions 34a, 34b, 34c
Are housed in a cylindrical container 35, and the connection conductor 36
a, 36b, 36c, the connecting portions 33a, 33b, 3
3c is established.

Reference numerals 37a, 37b, and 37c denote ground conductors, which are provided in the same container 35 as the vacuum valve portion 34, and are connected to the connection portions 33a, 33b, and 33c by rotating the container 35. Is performed.

FIG. 3 is a sectional view of an essential part showing an example of the connecting parts 33a, 33b, 33c.

In FIG. 3, the connecting portion 33 is a central conductor 3
An insulating layer 39 is molded around the portion 8 and is fixed to a mounting plate 41 fixed to the box body 10 by bolts 40.

A U-shaped opening 38a is provided at the end of the center conductor 38, and a contact 42 is attached to the upper and lower inner surfaces thereof. The conductor is moved up and down on the paper to connect, disconnect, or ground.

FIG. 4 is a sectional view of an essential part showing an example of the shape of the contact 42.

In FIG. 4, the contacts 42 are attached in an arc shape above and below the U-shaped opening 38a as shown in the figure.

In FIG. 4, connection and the like are performed by moving the movable conductor left and right on the paper.

A protruding electrode portion 38b is provided at an end of the opening 38a, and an insulating layer 39a is provided around the protruding electrode portion 38b to reduce the electric field.

FIG. 5 is a perspective view showing an example of the contact 42.

In FIG. 5, the contact 42 is made of, for example, a phosphor bronze material having a spring property, is provided with a plurality of minute projections 42a, and is energized.

In such a configuration, the energization area can be easily changed by changing the size of the opening 38a, so that a large capacity can be easily realized.

FIG. 6 is a sectional view showing an example of a disconnection state from the power receiving point cable head 11 to the load-side bus portion 26 in the switchgear having the configuration shown in FIG.

The connection portions 33a, 33 in the disconnected state
3b and 33c are vacuum valve portions 34a, 34b and 34c
Since the configuration is the same above and below, only one of them will be described here.

In FIG. 6, a connecting portion 33 is
a, 33b, 33c are mounted, and the container 35 containing the vacuum valve portions 34a, 34b, 34c rotates in the direction A in the drawing, and stops at a position located between the ground conductors 37a, 37b, 37c. ing.

This rotation moves in the circumferential direction with the center axis of the container 35 as a fulcrum.

In such a configuration, in the disconnected state,
Since the upper and lower connecting portions 33a, 33b, 33c are simultaneously separated, two gap portions 43 are formed.

For this reason, the vacuum valve portions 34a, 34b,
34c is an intermediate potential, and the potential is determined by the respective capacitances of the upper and lower gap portions, and is about 50%.

Accordingly, when viewed from the power supply side and the load side, the gap length is twice as large as the gap length obtained at the angle at which the container 35 is rotated, and the dielectric strength is approximately doubled.

Thus, the container 35 having a small rotation angle can be obtained.

Here, when the ground conductors 37a, 37b, and 37c are provided, the rotation angle of the container 35 is set to 3 because the vacuum valve portions 34a, 34b, and 34c are arranged in a triangular arrangement every 120 degrees. An equal 40 degrees can ensure the longest gap length.

If there are no ground conductors 37a, 37b, 37c, an angle of 60 degrees can ensure the longest gap length.

It is needless to say that these angles can be set so that the withstand voltage of the device can be ensured because the insulating characteristics vary depending on the electrode shape and the insulating structure of each part.

FIG. 7 is a cross-sectional view showing an example of a grounded state from the power receiving point cable head 11 to the load-side bus portion 26 in the switchgear configured as shown in FIG.

In FIG. 7, the container 35 is further rotated to connect the ground conductors 37a, 37b, 37c to the connection portions 33a, 33a.
By connecting to the power supply 33b and 33c, the power supply side and the load side such as the bus are grounded.

The ground conductors 37a, 37b, 37c
Are connected to a ground electrode by a conductor (not shown).

Since the connection, disconnection, and grounding states can be realized by a series of rotation operations of the container 35 as described above, the functions of each device are combined to reduce the overall shape. Switchgear can be obtained.

As described above, in the switchgear of this embodiment, the vacuum valves are arranged in a triangular manner, and the main circuit conductors for the three phases are provided outside each other to constitute the connection portion. The connection and disconnection of the main circuit conductors can be performed by rotating the cylindrical container storing the container, so that the disconnection by the vacuum valve and the disconnection by rotation of the cylindrical container can be performed by the same device.

In the disconnected state, since the main circuits on the power supply side and the load side are simultaneously opened, a two-point gap is formed to improve the insulation characteristics.

Further, the power supply side and the load side are grounded by being further rotated to be connected to the grounding conductor provided in the cylindrical container. Because it can be connected to the main circuit on the load side and the load side, the function provided with the grounding device can be performed in the same container.

On the other hand, in the above, since the angle of the cylindrical container to be rotated is set to 60 degrees in the disconnection function, the insulation distance of the contact point of the disconnection portion can be maximized, and the power supply side and the power supply side can be secured. Since a two-point gap is formed by the disconnection portion on the load side, the size of the cylindrical container that houses the vacuum valve can be reduced.

The angle of the cylindrical container to be rotated is set to 40 degrees in the disconnecting function, and is further rotated by 80 degrees in the grounding function.
The maximum distance between the contacts of the disconnecting part and the ground electrode can be ensured, and the two-point gap between the power supply side and the load side electrodes accommodates the vacuum valve. The size of the cylindrical container can be reduced.

Further, since the cylindrical container accommodating the vacuum valve and the container accommodating the operation mechanism directly connected thereto are integrally rotated, the operation force of the operation mechanism can be transmitted to the contacts of the vacuum valve without loss. Therefore, the operating force can be reduced.

On the other hand, since the height of the bus is different from each other in each phase, the insulation distance in the inter-phase direction can be secured, and the board width can be reduced.

Further, the main circuits from the cable heads arranged in a horizontal line to the vacuum valves arranged in a triangular arrangement can be connected in a short distance.

Further, a three-phase integrated cable or a three-phase cable housed in the same pit can be easily connected.

Further, since the cables for three phases are spread at the cable head portion at the board connection point, the connection between the cable head and the vacuum valve can be easily performed.

Further, since the connecting portion connects the horizontally moving main circuit conductor with a contact having a substantially U-shaped opening, the opening is aligned with the rotation direction of the main circuit conductor. Since the connection can be performed by a simple rotating operation by the holding portion, the width of the main circuit conductor can be easily changed, and the capacity can be increased.

As described above, it is possible to realize a combination of functions of performing the functions such as disconnection, disconnection, and grounding with the same device, so that it is possible to reduce the overall shape of the switchgear and increase the capacity. .

(Second Embodiment) FIG. 8 is a sectional view of an essential part showing an example of a vacuum valve section in a switchgear of the present embodiment.

In FIG. 8, one-phase vacuum valve 44
Are housed in an insulating cylindrical container 45, and upper and lower conductors 47 and 48 provided with an insulating layer 46 on the upper and lower sides (on the power supply side and the load side) are attached.

The top end 47 of the upper conductor 47 and the lower conductor 48
a and 48a have no insulating layer 46, and have a connecting portion 33 (not shown).
Connection is made.

The upper conductor 47 is fixed by bolts 49, and the lower conductor 48 is fixed to an electrode 50 provided with a movable contact (not shown).

The movable conductor 5 penetrating the electrode 50
1, an insulating rod 52 is directly connected to an operation mechanism (not shown) via a mounting plate 53.

Further, the container 45 includes three insulating plates 54.
It is fixed to.

FIG. 9 is a diagram showing characteristics obtained by determining insulation properties and mechanical strength, where t is the insulation thickness of the container 45, and G is the gap from the container 45 to the vacuum valve 44.

In FIG. 9, the insulation properties are such that the wider the gap G from the container 45 to the vacuum valve 44, the lower the electric field strength of the electrodes of the vacuum valve 44 and the higher the withstand voltage.
The mechanical strength increases as the insulation thickness t increases.

If the outer shape of the container 45 is determined to be constant, the mechanical strength increases as the insulation thickness t increases,
Insulation properties are conversely degraded. FIG. 9 shows this relationship as t / G on the horizontal axis and mechanical stress / electric field on the vertical axis.

FIG. 9 shows that the ratio of the insulating thickness t of the container 45 to the gap G from the container 45 to the vacuum valve 44 is t / t.
It has been found that, at the point where G is 1 or a value near the value, the condition is that the mechanical stress is high and the electric field is small.

That is, since the mechanical strength is maintained and the withstand voltage is improved, the overall shape including the container 45 can be reduced.

As described above, in the switchgear of the present embodiment, the insulating thickness t of the container 45 accommodating the vacuum valve 44 and the gap G from the container 45 to the vacuum valve 44 are different.
Are set to be substantially the same, and since the withstand voltage is improved by optimizing the electric field, it is possible to reduce the container and the insulation distance.

(Third Embodiment) FIG. 10 is a sectional view of a main part showing an example of a grounding configuration of a vacuum valve section in a switchgear of this embodiment.

In FIG. 10, a conductive paint layer is provided as a ground layer 55 outside an insulating cylindrical container 45 that houses the vacuum valve 44.

At the ends of the ground layer 55, relaxation layers 56 and 57 for reducing the electric field are provided at both ends, and curved portions 56a and 57a are provided so as to surround the ground layer 55 in a folded manner. I have.

Further, ground layers 55 are continuously provided on the inner surfaces of the curved portions 56a and 57a.
a, 57a are facing each other.

Further, from the side wall 58 of the box, a contact plate 59 having a spring property is fixed by a bolt 60,
It is in contact with ground layer 55.

With this configuration, when each phase is grounded, the container 45 accommodating the vacuum valve 44 can be grounded, so that there is no concern about the insulation characteristics in the inter-phase direction. That is, the dielectric strength in the interphase direction is higher than that in the ground direction, and an insulation configuration with insulation coordination can be obtained.

As described above, in the switchgear of the present embodiment, a conductive paint layer is provided as a ground layer 55 on the outer surface of the container 45 accommodating each vacuum valve 44, and the end of the ground layer 55 Arc-shaped curved portions 56a, 57a are provided so as to surround the ground layer 55, and the curved portions 56a, 57a
The contact plate 5 is arranged such that the inner surfaces of the contact plates face each other at the ends of the ground layers 55 at both ends, and are fixed to a metal box for housing the container.
9 is brought into contact with the grounding layer 55, so that the electric field at the end of the grounding layer 55 provided outside the container housing the vacuum valve can be reduced, so that the insulation thickness and creepage distance of the container 45 can be reduced. be able to.

(Other Embodiments) (a) In the above-described embodiment, the cable head is not triangularly arranged in a horizontal line, but the cable ends are expanded in accordance with the arrangement of the vacuum valve and the cable head is triangulated. By arranging, the conductor to the connection part is not required, the number of components is suppressed, and the overall configuration can be reduced.

(B) Not only the vacuum valve for shutting off,
For electrical equipment such as instrument transformers and lightning arresters that cannot be subjected to on-site withstand voltage tests and must be separated from the main circuit conductor of the switchgear, store each electrical equipment in a rotary container and rotate it. By performing the disconnection, it is possible to obtain a composite electric device which has excellent dielectric strength and can be reduced in size.

[0119]

As described above, according to the switchgear of the present invention, the main circuit conductor in which the vacuum valves are arranged in a triangular shape and housed in a cylindrical container, and are led to the power supply side and the load side of the vacuum valve. And, the connection portion provided on the outer periphery of the cylindrical container, the connection and disconnection by rotating the cylindrical container, and further rotated and connected to the ground conductor provided in the cylindrical container, and the power supply side Since the load side is grounded, it has a composite function and can be reduced in overall shape.

Further, since the connecting portion connects the horizontally moving main circuit conductor with a contact having a substantially U-shaped opening, the connecting portion can easily increase the capacity. Can be obtained.

Further, since the insulating thickness of the insulating container accommodating the vacuum valve and the gap length from the insulating container to the vacuum valve are optimized, it is possible to obtain a switchgear with a reduced main circuit portion. Becomes possible.

As described above, it is possible to combine the functions of the respective devices, thereby reducing the overall shape and increasing the capacity.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a switchgear according to the present invention.

FIG. 2 is a sectional view of a cable head portion showing a connection state in the switchgear according to the first embodiment.

FIG. 3 is an essential part cross-sectional view of a connection portion in the switchgear according to the first embodiment;

FIG. 4 is an essential part cross-sectional view of a connection portion in the switchgear according to the first embodiment;

FIG. 5 is a perspective view showing an example of a contact used for the connection part in FIGS. 3 and 4;

FIG. 6 is a sectional view of a cable head portion showing a disconnected state in the switchgear according to the first embodiment.

FIG. 7 is a cross-sectional view of a cable head portion showing a grounded state in the switchgear according to the first embodiment.

FIG. 8 is an essential part cross-sectional view showing a second embodiment of the switchgear according to the present invention.

FIG. 9 is a characteristic diagram showing electric field strength and mechanical strength obtained by the insulating thickness and gap length in the switchgear according to the second embodiment.

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

FIG. 11 is a single-line diagram of a typical power supply system.

FIG. 12 is a side view showing a configuration example of a conventional typical switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Partition wall, 3 ... Breaker, 4 ... Disconnector, 5 ... Busbar, 6 ... Support insulator, 7, 11 ... Cable head, 8 ... Connection conductor, 9 ... Insulating spacer, 10 ... Box body, 12, 34: vacuum valve section, 13, 15: conductor, 14, 24, 42: contact, 16, 35, 45 ... container, 17, 30: operating mechanism, 18: movable side conductor, 19: insulating rod, 20 ... Fixed-side conductor, 21, 36 ... Connection conductor, 22 ... Insulation support plate, 23 ... Connection part, 25 ... Partition plate, 26,29 ... Connection busbar, 27,38 ... Center conductor, 28,39,46 ... Insulation layer 31: lightning arrester, 32: insulated conductor, 33: connecting part, 37: ground conductor, 40, 49, 60 ... bolt, 41 ... mounting plate, 43 ... gap part, 44 ... vacuum valve, 47 ... upper conductor, 48 ... Lower conductor, 50 ... electrode, 51 Movable conductor, 52 ... insulating rod 53 ... mounting plate, 54 ... insulating plate, 55 ... ground layer, 56, 57 ... relaxation layer, 58 ... side wall, 59 ... contact plate.

Claims (12)

[Claims] 1. A switchgear, in which various switching devices such as a circuit breaker and a disconnecting switch are housed in a sealed container to constitute a power supply system, a triangular arrangement of three-phase vacuum valves, Housed in a cylindrical container that rotates about the direction center axis, the main circuit conductor of the three-phase vacuum valve, the power supply side and the load side are led out to the outer periphery of the cylindrical container every 120 degrees, A switchgear, wherein a connection portion for connecting to a main circuit is provided on an outer periphery of the cylindrical container so as to face a main circuit conductor of the vacuum valve that is led out. 2. The switchgear according to claim 1, wherein the cylindrical container in which the three-phase vacuum valves are arranged in a triangular arrangement and rotated around the axial center axis. A connection portion provided on an outer periphery of the switchgear and a main circuit conductor of the vacuum valve are connected or disconnected on a power supply side and a load side, respectively. 3. The switchgear according to claim 1, wherein the cylindrical container in which the three-phase vacuum valves are arranged in a triangular arrangement is rotated about the central axis in the axial direction, thereby forming the cylindrical container. A switch gear, wherein a ground conductor provided in the cylindrical container is connected to a connection portion provided on an outer periphery of the switch. 4. The switchgear according to claim 2, wherein a cylindrical container housing the three-phase vacuum valves in a triangular arrangement is connected to a connection point between a main circuit conductor of the vacuum valve and the connection portion. A switchgear characterized in that each of the main circuit conductors is connected to or separated from each other by rotating the main circuit conductors to an angle of 60 degrees from the starting point. 5. The switchgear according to claim 3, wherein a cylindrical container containing the three-phase vacuum valve and the ground conductor separately housed is a main circuit conductor of the vacuum valve and the connection portion. Is rotated to an angle of 40 degrees from the connection point of the starting point to connect or disconnect each main circuit conductor, and the cylindrical container is further rotated to an angle of 40 degrees to be connected to the ground conductor. A switchgear characterized by that: 6. The method according to claim 2, wherein
The switchgear according to the above, wherein a cylindrical container housing the three-phase vacuum valves arranged in a triangular arrangement and a container housing an operation mechanism directly connected to the movable conductor of the vacuum valve are integrally rotated. A switchgear characterized in that: 7. A three-phase main circuit device is arranged in a triangular arrangement in a switchgear constituting a power supply system by housing various switching devices such as a circuit breaker and a disconnector in a sealed container. The height of a conductor connected to the main circuit device in a main circuit bus connecting one cylindrical container and the other cylindrical container in which similar main circuit devices are arranged in a triangular arrangement is set to three. A switchgear wherein the main circuit buses are arranged substantially horizontally, with the phases being different from each other. 8. The method according to claim 1, wherein
The switchgear according to claim, wherein the three-phase vacuum valves are arranged in a row in a row at a connection portion provided to face a main circuit conductor of the vacuum valve derived from a cylindrical container housing the triangularly arranged vacuum valves. A switchgear, wherein the main circuit conductors of the three-phase cable head are connected to each other. 9. The method according to claim 1, wherein
The switchgear according to claim, wherein the three-phase vacuum valve is disposed in a triangular arrangement and housed in a connection portion provided opposite to a main circuit conductor of the vacuum valve derived from a cylindrical container housed therein. A switchgear wherein a cable head is provided in accordance with the arrangement of the connecting portion and connected to each other. 10. The switchgear according to claim 1, wherein the vacuum valve of the three-phase vacuum valve is triangularly arranged and housed in a cylindrical container. The conductor of the connection portion provided opposite to the main circuit conductor is a center conductor having a substantially U-shaped opening at the tip in accordance with a region in which the main circuit conductor of the vacuum valve moves horizontally. A switchgear, wherein a contact is provided on the inner surface of the U-shaped opening, and the main circuit conductor of the vacuum valve is rotated horizontally to be connected by the contact. 11. The switchgear according to claim 1, wherein the three-phase vacuum valves are housed in individual insulating containers, and the insulating thickness of the insulating containers and A switch gear, wherein a ratio of a gap from an insulating container to the vacuum valve is set to 1 or a value close to 1. 12. The switchgear according to claim 11, wherein a conductive paint layer is provided as a ground layer on an outer surface of the insulating container accommodating each of the vacuum valves, and the contact portion is connected to an end of the ground layer. A contact plate fixed to a metal box housing the insulating container is provided such that an arc-shaped curved portion is provided so as to surround the stratum, the inner surfaces of the curved portion are arranged to face each other at the ends of the ground layers at both ends. A switchgear contacting the ground layer.