JP3221374B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear (hereinafter, referred to as "GIS").
The present invention relates to a GIS including a cable head element.

[0002]

2. Description of the Related Art A conventional GIS will be described with reference to FIG. FIG. 1 shows a side view of the GIS in cross section. Illustrated GI
S is composed of a busbar element 1, a circuit breaker element 2, and a cable head element 3.

[0003] The cable head element 3 is composed of four metal containers filled with SF6 gas. The first metal container 4 accommodates a cable head 5, a disconnector 6, a grounding switch 7, and a disconnector 8 for an instrument transformer. An instrument transformer 10 is housed in the second metal container 9. A lightning arrester disconnector 12 is housed in the third metal container 11.
A lightning arrester 14 is housed in the fourth metal container 13. Note that the disconnector 8 for the instrument transformer is arranged such that the movable contact moves from the front to the back of the figure.

[0004] The first metal container 4 is mounted on a gantry 15 and is joined to an adjacent breaker element 2 via an insulating spacer 16 supporting a conductor. The cable 17 connected to the cable head 5 is guided through the gantry 15 to a cable insertion opening 18 formed below the floor.
A current transformer 19 for measuring a current flowing through the cable 17 is arranged on the gantry 15.

[0005] The second metal container 9 and the third metal container 11
Are joined to the first metal container 4 via insulating spacers 20 and 21, respectively, and the fourth metal container 13 is joined to the third metal container 11 via the insulating spacer 22. Each metal container is gas-separated by an insulating spacer. Note that the entire configuration and functions of the GIS shown in FIG. 1 are well known, and thus description thereof will be omitted.

[0006]

The GIS is widely recognized for its features such as miniaturization, high reliability, and safety. However, recently, further miniaturization is required.
From the viewpoint of further downsizing, the GIS described above
The following issues can be found. That is, four metal containers are required for the cable head element 3, and the GIS is increased in size. Insulating spacers for supporting conductors only in the cable head element 3 are provided.
It is necessary and expensive. Further, since the first metal container 4 is joined to the metal container of the adjacent element via the insulating spacer 16 having low mechanical strength, the gantry 15 for supporting the weight of the first metal container 4 is required. And

As described above, in the conventional GIS, the cable head element requires a large number of metal containers and insulating spacers, and further requires a base for supporting the metal container. Is becoming In addition, the connection between the components of the cable head element is complicated because the connection is made between the metal containers.

An object of the present invention is to reduce the size, weight, and cost of a GIS.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. According to the present invention, in a GIS including a cable head element, the metal container of the cable head element is constituted by one. The metal container is connected to the metal container of the adjacent element by a metal flange. The metal container includes a cable head, a disconnector, a grounding switch, an arrester, a transformer for an instrument, a disconnector for an arrester, a disconnector for an instrument transformer. Is stored.

[0010] Thus, the number of metal containers can be reduced, and the number of insulating spacers for joining the metal containers can be reduced, so that the GIS can be reduced in size and cost. Further, the metal container is connected to the adjacent element by a metal flange without using an insulating spacer having low mechanical strength. Therefore, it is possible to support by the adjacent element, and it is possible to omit the conventionally required mount.

A conductor for connecting a cable head, a disconnector, a grounding switch, an arrester, an instrument transformer, an arrester disconnector, and an instrument transformer disconnector is integrally formed.
It is supported on the metal container by the supporting insulator. As described above, by using a conventionally formed conductor as an integrally formed conductor, the number of conductors and the number of components supporting the conductor can be reduced, and the overall length of the conductor can be reduced. it can.

The disconnector is disposed at a position orthogonal to the cable head insertion direction, the fixed contact is attached to an insulating spacer provided on an adjacent element, and the sliding contact and the movable contact are attached to the conductor. Can be The grounding switch is arranged on the side of the cable head at the same position as the insertion direction of the cable head, and its fixed contact is attached to the conductor. The lightning arrester and the instrument transformer are arranged on the conductor, and the lightning arrester disconnector and the instrument transformer disconnector are attached to the conductor as a common one. A hollow portion is formed in the conductor so that the movable contact of the disconnector can move within the conductor.

As described above, since the arrangement of the devices in the metal container is rationalized, all the components of the cable head element can be stored in one metal container. In particular, since the length of the metal container in the vertical direction can be shortened by omitting the gantry, the empty space between the metal container and the floor can be increased. Therefore, by utilizing the empty space, the number of current transformers to be installed can be increased, or the cable connection can be performed on the floor by omitting the cable insertion opening.

As described above, according to the present invention, G
IS can be reduced in size and weight, and GIS
Can be simplified.

[0015]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a three-phase collective G to which the present invention is applied.
It is a side view of IS. Here, a metal container constituting each element is shown in cross section. FIG. 3 is an enlarged view of the cable head element of FIG.

The GIS includes a bus element 1, a circuit breaker element 22, and a cable head element 23. Since the overall configuration and functions of the GIS shown in FIG. 2 are well known in the related art, only the cable head element 23 will be described here. The cable head element 23 is
It is composed of one metal container 24 filled with F6 gas. This metal container 24 is connected to the adjacent circuit breaker element 22.
Metal container 25 and a metal flange. That is,
Flanges 26, 27 are attached to the branch pipes of the two metal containers 24, 25.
Are formed respectively, and flanges 26,
27 are joined.

As described above, the cable head element 2
The metal container 24 of No. 3 is supported by a metal flange connection with the immediately adjacent metal container 25 without the use of an insulating spacer having a low mechanical strength, so that a frame for supporting the weight of the metal container, which was conventionally required, is omitted. can do. An insulating spacer 28 that supports a conductor between the circuit breaker element 22 and the cable head element 23 is attached to a branch pipe on the circuit breaker element 22 side, and separates the gas between the two metal containers 24 and 25.

In one metal container 24, the cable head 5, the disconnecting switch 32, the grounding switch 48, the lightning arrester 14, and the instrument transformer 10 are housed. Further, the lightning arrester disconnector and the instrument transformer disconnector serve as a common lightning arrester and instrument transformer disconnector 29 and are housed in the metal container 24. As described above, only one metal container is required, which is required in the past. Further, the insulating spacers conventionally required three in the cable head element 23 become unnecessary.
Therefore, the size and cost of the GIS can be reduced.

To accommodate all the components of the cable head element 23 in one metal container 24, the arrangement of each device is as follows. Cable head 5, disconnector 32, grounding switch 48, lightning arrester 14, instrument transformer 1
0, the conductor connecting the lightning arrester and the disconnecting switch 29 for the instrument transformer is formed as an integrally formed conductor 30.
The conductor 30 is provided for each of the three phases, and each is supported by the flange 27 of the metal container 24 by the support insulator 31. As described above, the number of conductors and the number of parts supporting the conductors are reduced, and the overall length of the conductors is reduced by forming the conductor 30 which has been conventionally formed of a plurality of conductors into the integrally formed conductor 30. Can be.

In order to form the conductor 30 integrally,
The arrangement of each device is as follows. The disconnector 32 for the cable head is arranged at a position orthogonal to the insertion direction of the cable head 5. The fixed contact 33 is directly attached to the conductor of the insulating spacer 28. Sliding contact 34
Is attached to the tip of the conductor 30 at a position facing the fixed contact 33. A hollow portion 36 for accommodating the movable contact 35 is formed behind the sliding contact 34 of the conductor 30. In this hollow portion 36, a drive lever 38 driven to rotate by an operation shaft 37 is attached to the movable contact 35. As a result, the movable contact 35 moves in a direction orthogonal to the insertion direction of the cable head 5 and comes into contact with and separates from the fixed contact 33 while slidingly contacting the sliding contact 34.

The grounding switch 48 is disposed on the side of the cable head 5 at the same position as the insertion direction of the cable head 5. The fixed contact 39 is attached to the conductor 30, and the sliding contact 40 is arranged below and opposed to the fixed contact 39. The movable contact 41 includes an operation shaft 42,
The driving lever 43 is driven in parallel with the insertion direction of the cable head 5, and comes into contact with and separates from the fixed contact 39 while slidingly contacting the sliding contact 40.

As described above, the disconnecting switch 32 and the earthing switch 4
8 is a structure in which a part of the structure is formed by insulating spacer 28 or conductor 3
By being integrated with 0, the number of components is reduced and the space required for arrangement is reduced. The lightning arrester 14 and the instrument transformer 10 are arranged above the cable head 5 and the conductor 30. Instrument transformer 10
The lightning arrester 14 is fixedly attached to the metal container 24.
4 so as to be movable with respect to 4. Sliding mechanism 44
Moves the lightning arrester 14 in the vertical direction by operating from outside the metal container 24.

The movable contact 45 of the lightning arrester and the disconnector 29 for the instrument transformer is attached to the lower end of the lightning arrester 14, and the fixed contact 46 is attached to the upper part of the conductor 30. When the lightning arrestor 14 is at the lower end position (the position shown in the drawing), the disconnectors 29 come into contact when the two contacts 45 and 46 come into contact with each other and the lightning arrester 14 is moved to the upper end position. Also,
The instrument transformer 10 is connected to the movable contact 45 on the lightning arrester 14 side by a flexible conductor 47.

Therefore, the lightning arrester 14 and the instrument transformer 1
“0” is connected to the conductor 30 via the common disconnector 29. The disconnecting switch 29 is opened and closed by moving the lightning arrester 14 up and down by the sliding mechanism 44. As a result, two disconnectors conventionally required are combined into one, and the disconnector 29 is reduced in size to make the metal container 2
The space inside 4 can be used effectively.

As described above, by rationalizing the arrangement of the devices in the metal container, all the components of the cable head element can be stored in one metal container 24. In addition, since the length of the metal container 24 in the vertical direction can be shortened, an empty space between the metal container 24 and the floor can be increased. Therefore, since the cable 17 can be bent in this empty space, it is possible to omit forming a cable insertion opening below the floor, which is conventionally required.
Alternatively, when the cable insertion opening is formed below the floor, the number of current transformers installed can be increased as shown by a two-dot chain line in the figure.

As described above, according to the present invention, G
IS can be reduced in size and weight, and GIS
Can be simplified.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a conventional GIS.

FIG. 2 is a side sectional view of a GIS to which the present invention is applied.

FIG. 3 is an enlarged sectional view of the cable head element of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bus element 5 ... Cable head 10 ... Instrument transformer 14 ... Lightning arrester 17 ... Cable 19 ... Current transformer 22 ... Circuit breaker element 23 ... Cable head element 24, 25 ... Metal container 26, 27 ... Flange 28 ... Insulation spacer 29 disconnector 30 conductor 31 support insulator 32 disconnector fixed contact 34 sliding contact 35 movable contact 36 hollow portion 37 drive shaft 38 drive lever 39 fixed contact 40 Sliding contact 41: movable contact 42: operating shaft 43: drive lever 44: sliding mechanism 45: movable contact 46: fixed contact 47: conductor 48: ground switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 13/02 H02B 13/075 H01H 33/64

Claims (2)

(57) [Claims] 1. A gas insulated switchgear including a cable head element, wherein the cable head element is connected to a metal container of an adjacent element by a metal flange, and a cable head and disconnection housed in the metal container. Switch, earthing switch, lightning arrestor, instrument transformer, lightning arrester disconnector, instrument transformer disconnector, and the above cable head, disconnector, earthing switch, lightning arrester, instrument transformer, lightning arrester disconnector, instrument And a support insulator for supporting the conductor with respect to the metal container, wherein the disconnector is orthogonal to the insertion direction of the cable head. Position, the fixed contact is attached to an insulating spacer provided on an adjacent element, and the sliding contact and the movable contact are attached to the conductor. The grounding switch is arranged at the same position as the insertion direction of the cable head on the side surface of the cable head, and its fixed contact is attached to the conductor. The lightning arrester and the instrument transformer are The disconnector for the lightning arrester and the disconnector for the transformer for the instrument are arranged in the upper part of the conductor, and the fixed contactor is attached to the conductor, and the conductor is provided on the conductor. A gas-insulated switchgear having a hollow portion that allows a movable contact to move within a conductor. 2. The gas insulated switchgear according to claim 1, wherein a bearing for operating the grounding switch is disposed in a branch pipe of the metal container.