JP2003087916A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear (GIS) which has a simple construction and a reduced number of manipulators of switches. SOLUTION: A bus-bar side three-way disconnector 2 which is used as both a bus-bar side disconnector and a bus-bar side ground switch is employed, and a line side three-way disconnector 4 which is used as both a line side disconnector and a line side ground switch is employed. With such a construction, the number of manipulators 18 and 19 can be reduced and sizes of switches can be reduced. The main parts of the respective three-way disconnectors are attached to a partition wall 11 or a breaker support frame 15. With such a construction, the three-way disconnectors can be assembled and adjusted before they are incorporated into a GIS. By arranging the fixed contactors and movable contactors of the three-way disconnectors rationally, the dimensions of the GIS can be reduced.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional GIS will be described with reference to FIG. (A) of the figure is a side sectional view of a power receiving unit for pulling in a cable of GIS, and (B) is a single wire connection diagram of GIS. The power receiving unit has an operation panel 17 on the front side, a circuit breaker container 6 and a bus bar container 10 in the center, and a cable head 5 on the back side. In the unit, the cable head 5
Is connected to the circuit breaker 3 via the line side disconnector 53.
The circuit breaker 3 is connected to the busbar 1 via the busbar-side disconnector 51.

Both ends of the circuit breaker 3 are connected to circuit breaker ground switches 52 and 54, respectively. Thus, in the conventional product, the bus-side disconnector 51 and the circuit breaker grounding switch 52 are separately arranged, and the line-side disconnecting switch 53 and the circuit breaker grounding switch 5 are arranged.
4 were placed separately. Also, the disconnectors 51, 53,
The grounding switches 52 and 54 are different operating devices 56 and 5, respectively.
It was driven by 7. The operation devices 55, 56, 57 of the circuit breaker, the disconnecting switch, and the grounding switch are housed in the operation panel 17.

[0004]

In the above-mentioned conventional GIS, (1) the number of operating devices is large, (2) the structure of the container is complicated, and (3) the operating panel in which the operating devices are housed. There was a problem that there was little space and inspection and maintenance was not easy. It is an object of the present invention to provide a GIS having a simple structure and a reduced number of operating devices for disconnecting switches and grounding switches.

[0005]

The present invention has been made to achieve the above object. The GIS of the present invention is
It is composed of a circuit breaker container and a bus bar container provided thereon, and the breaker container and the bus bar container are gas-divided by a partition wall. The circuit breaker is horizontally supported in the container by the circuit breaker support frame attached to the front side of the circuit breaker container.

The line side end to which the bushing or the cable head is connected is formed on the back side of the circuit breaker container. One end of the conductor connecting the breaker and the line is connected to the lightning arrester, and the other end is insulated and supported by the partition wall. A fixed contact, to which a bushing or cable head is connected, is attached to this conductor.

A busbar-side three-position disconnector which doubles as a busbar-side disconnector and a circuit breaker grounding switch is housed in a busbar container. The fixed contactor on the ground side of this disconnector is attached to the ground terminal attached to the busbar container, the fixed contactor on the busbar side is insulated and supported by the partition wall, and the movable contactor of the insulating spacer is provided on the partition wall. It is attached to the through conductor. The operating device of this disconnector is arranged on the front side of the circuit breaker container.

A line-side three-position type disconnector which doubles as a line-side disconnector and a circuit breaker grounding switch is housed in a circuit breaker container. The fixed contact on the line side of the disconnector is attached to the conductor connected to the arrester, the fixed contact on the ground side is attached to the breaker support frame, and the movable contact is attached to the terminal of the breaker. The operating device of this disconnector is arranged on the front side of the circuit breaker container.

According to the present invention, the bus-side disconnector and the circuit breaker grounding switch are combined with the three-position disconnector, and the line-side disconnector and the circuit breaker grounding switch are combined together with the three-position disconnector. As a result, the number of operating devices can be reduced. In addition, since the main part of each three-position disconnector is attached to the partition wall or the circuit breaker support frame, it can be assembled and adjusted before being housed in each container. Furthermore, since the arrangement inside the busbar container and the breaker container can be rationalized, the GIS can be downsized.

Further, the GIS of the present invention can be a unit in which a transformer unit is integrated with a power receiving unit. In this case, a transformer connecting portion for connecting to the transformer is formed in the busbar container, and the busbar is connected to the transformer via the transformer-side three-position disconnector.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a side sectional view of the GIS power receiving unit, and FIG. 3 is a single wire connection diagram thereof. The cable head 5 is connected to one terminal of the circuit breaker 3 via the line-side three-position disconnector 4. The other terminal of the circuit breaker 3 is connected to the busbar 1 via the busbar-side three-position disconnector 2.

The circuit breaker 3 and the line-side three-position disconnector 4 are housed in a circuit breaker container 6. A lightning arrester 7, a line voltage sensor 8 and a line grounding switch 9 are further connected to the line side of the circuit breaker 3. The busbar container 10 is mounted on the breaker container 6. The busbar 1 and the busbar-side three-position disconnector 2 are housed in a busbar container 10. The circuit breaker container 6 and the busbar container 10 are internally S
An insulating gas such as F6 gas is enclosed. The circuit breaker container 6 and the busbar container 10 are gas-divided by a partition wall 11.

The busbar-side three-position type disconnector 2 also serves as the busbar-side grounding switch of the circuit breaker 3, and the line-side three-position type disconnector 4 is provided.
Also serves as a grounding switch on the line side of the circuit breaker 3. The cable head 5 is attached to the line-side end 12 formed on the back surface of the circuit breaker container 6. The cable head 5 and the current transformer 13 are housed in a cable head container 14.

The circuit breaker 3 is attached to the circuit breaker support frame 15, and the circuit breaker support frame 15 is attached to the opening provided in the front surface of the circuit breaker container 6. Thereby, the circuit breaker 3 is horizontally arranged in the circuit breaker container 6. The operation mechanism 16 of the circuit breaker includes an operation panel 17 arranged in front of the circuit breaker container 6.
Is stored in. The operating panel 17 further accommodates an operating device 18 of the bus-side three-position disconnector 2 and an operating device 19 of the track-side three-position disconnector 4.

The busbar-side three-position disconnector 2 comprises a movable contactor 20 connected to the circuit breaker 3, a busbar-side fixed contactor 21 connected to the busbar 1, and a ground-side fixed contactor 22. . The movable contactor 20 has three positions: a position in contact with the bus-side fixed contactor 21, a position in contact with the ground-side fixed contactor 22, and an intermediate position therebetween.

The main part of the busbar-side three-position disconnector 2 is mounted on the partition wall 11. An insulating spacer 23 is provided on the partition wall 11.
Is attached, and the movable contact 20 is attached to the through conductor 24. The bus bar side fixed contactor 21 is an insulator 25.
It is attached to the partition wall 11 via. The bus bar side fixed contact 21 is connected to the bus bar 1. Ground side fixed contact 22
Is a ground terminal 26 attached to the side surface of the busbar container 10.
Attached to.

Since the main part of the busbar-side three-position disconnector 2 is mounted on the partition wall 11, most of the busbar-side three-position disconnector 2 can be preassembled and adjusted on the partition wall 11. . The adjustment of the busbar-side three-position disconnector 2 after the GIS is assembled only requires adjustment between the movable contact 20 and the ground-side fixed contact 22.

The line-side three-position disconnector 4 is composed of a movable contact 30 connected to the circuit breaker 3, a line-side fixed contact 31 connected to the line-side, and a ground-side fixed contact 32. . The movable contact 30 has three positions: a position in contact with the line side fixed contact 31, a position in contact with the ground side fixed contact 32, and an intermediate position therebetween.

The main part of the line-side three-position disconnector 4 is mounted on the circuit breaker support frame 15. The movable contact 30 includes the circuit breaker 3
It is attached to the terminal 33 of. Ground side fixed contact 32
Is supported by an insulator 29 attached to the circuit breaker support frame 15 below the circuit breaker 3 and is connected to a ground terminal 34 attached to the circuit breaker support frame 15. The line-side fixed contact 31 is attached to the line conductor 35.

A lower end of the line conductor 35 is connected to a terminal of the lightning arrester 7, and an upper end thereof is supported by the partition wall 11 via an insulator 36. Thereby, the line conductor 35 is arranged in the space between the circuit breaker 3 and the circuit breaker container 6. A line voltage sensor 8 and a line grounding switch 9 are further connected to the terminal of the lightning arrester 7.

Since the main part of the line-side three-position disconnector 4 is mounted on the circuit breaker support frame 15 in this manner, most of the line-side three-position disconnector 4 is mounted on the circuit breaker support frame 15 in advance. Can be assembled and adjusted. Adjustment of the line-side three-position disconnector 4 after the GIS is assembled is performed by the movable contactor 3.
Only the adjustment between 0 and the fixed contact 31 on the line side is required. Further, the line-side three-position disconnector 4 and the line conductor 35 can be arranged by effectively utilizing the space below the circuit breaker 3 and the space between the circuit breaker 3 and the circuit breaker container 6.

Another line-side fixed contact 28 is attached to the line conductor 35. The cable head 5 is inserted from the line-side end 12 and is fixed to the circuit breaker container 6 with the contact 37 at the tip thereof being connected to the line-side fixed contact 28. An operator 18 of the bus-side three-position disconnector and an operator 19 of the track-side three-position disconnector are housed in the operation panel 17. The operating devices 18, 19 and the three-position disconnectors 2, 4 are connected by a connecting mechanism (not shown).

As described above, since the disconnecting switch and the grounding switch are commonly used, they can be downsized and the number of operating devices can be reduced. Furthermore, since the space around the three-position disconnectors 2 and 4 can be secured, maintenance and inspection can be easily performed. As a result, the entire GIS can be downsized. Further, since the main parts of the three-position disconnectors 2 and 4 are mounted on the partition wall 11 and the circuit breaker support frame 15, assembly and adjustment are easy. Furthermore, since each device, switch, etc. are rationally arranged in the container, the GIS can be miniaturized also from this point.

Although the cable head 5 is used on the line side in the illustrated example, a bushing may be used instead of the cable head 5 to form a power receiving unit for drawing in the overhead wire.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. Second embodiment
Is a unit in which a GIS power receiving unit and a transformer unit are integrated, FIG. 4 is a side sectional view thereof, and FIG. 5 is a single-line connection diagram thereof. In the following description of FIGS. 4 and 5, only the points different from the above-described FIGS. 2 and 3 will be described, and description of common parts will be omitted.

A transformer connecting portion 38 is formed on the back side of the busbar container 10. The transformer connecting portion 38 extends cylindrically toward the back side, and the tip thereof is airtightly closed by the partition wall 39. A bushing cover 40 that covers a bushing of a transformer (not shown) is attached to the outside of the partition wall 39. The bushing cover 40 accommodates a fixed contactor 50 for connecting to the transformer. An insulating spacer 42 that supports the through conductor 41 is attached to the partition wall 39.

The bus bar 1 is a three-position disconnector 43 on the transformer side.
Is connected to the fixed contactor 50 which is connected to the transformer via the through conductor 41. The transformer side three-position disconnector 43 is
It also serves as a transformer side disconnector and a ground switch. The movable contactor 44 is attached to the through conductor 41. The ground-side fixed contactor 45 is connected to the ground terminal 46 attached to the transformer connecting portion 38. The bus bar side fixed contact 47 is insulated and supported by the partition wall 39 and connected to the bus bar 1. The transformer-side three-position disconnector 43 is switched by the operating device 18 of the bus-side three-position disconnector 2.

In this example, the transformer connecting portion 3 is provided in the space above the cable head 5 on the back side of the busbar container 10.
8 are arranged. In this way, by effectively utilizing the wasted space, the power receiving unit and the transformer unit can be integrated in a small shape, and at the same time, the overall size of the GIS can be reduced.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG.
The embodiment will be described. The third embodiment, like the second embodiment, constitutes a unit in which the power receiving unit and the transformer unit are integrated. Also in the following description, only the points different from the first and second embodiments will be described. The single line connection diagram of this example is similar to that of FIG.

In this example, the transformer connecting portion 48 is formed so as to extend to the front side. Except for the point that the transformer connecting portion 48 extends to the front side, other configurations, for example, the transformer side three-position disconnector 43, the bushing cover 40, etc., are the same as those in FIG. As a result of the transformer connecting portion 48 being provided in the front, there is a space above the line-side end 12 on the rear side of the unit, so that a bushing that extends upward to the line-side end 12 and is connected to an overhead wire (not shown). 49 can be attached.

Even when the transformer connecting portion 48 is extended forward as in this example, the cable head 5 shown in FIGS. 2 and 4 can be attached to the line-side end portion 12.

[0032]

According to the present invention, it is possible to provide a GIS having a simple structure and a reduced number of switches.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a conventional GIS.

FIG. 2 is a diagram showing Embodiment 1 of the GIS of the present invention.

FIG. 3 is a single line connection diagram of the GIS of FIG.

FIG. 4 is a diagram showing a second embodiment of the GIS of the present invention.

5 is a single line connection diagram of the GIS of FIG.

FIG. 6 is a diagram showing a third embodiment of the GIS of the present invention.

[Explanation of symbols]

1 ... Bus 2 ... Bus side three-position disconnector 3 ... Circuit breaker 4 ... Three-position disconnector on the track side 5 ... Cable head 6 ... Circuit breaker container 7 ... Lightning arrester 8 ... Line voltage sensor 9 ... Line grounding switch 10 ... Bus container 11 ... Partition wall 12 ... Track side end 13 ... Current transformer 14 ... Cable head container 15 ... Circuit breaker support frame 16 ... Circuit breaker operating mechanism 17 ... Operation panel 18 ... Bus-side three-position disconnector operating device 19: Track side three-position disconnector operating device 20 ... Movable contact 21 ... Bus side fixed contact 22 ... Ground side fixed contact 23 ... Insulating spacer 24 ... Through conductor 25 ... Insulator 26 ... Ground terminal 28: Track side fixed contact 29 ... Insulator 30 ... Movable contact 31 ... Fixed contact on the track side 32 ... Ground side fixed contact 33 ... Circuit breaker terminal 34 ... Ground terminal 35 ... Line conductor 36 ... Insulator 37 ... Contact 38 ... Transformer connection part 39 ... Partition wall 40 ... Bushing cover 41 ... Through conductor 42 ... Insulating spacer 43 ... Transformer-side three-position disconnector 44 ... Movable contact 45 ... Ground side fixed contact 46 ... Ground terminal 47 ... Bus-side fixed contact 48 ... Transformer connection 49 ... Bushing 50 ... Fixed contact 51 ... Bus-side disconnector 52, 54 ... Circuit breaker ground switch 53 ... Line side disconnector 55, 56, 57 ... Operation device

Claims (3)

[Claims] 1. A circuit breaker container, a busbar container provided thereon, a partition wall for partitioning the circuit breaker container and the busbar container into a gas, and a circuit breaker attached to the front side of the circuit breaker container. A circuit breaker support frame for horizontally supporting the circuit breaker in the container, a line side end formed on the back side of the circuit breaker container, to which a bushing or a cable head is connected, and a lower part in the circuit breaker container. A lightning arrester, a conductor connecting the circuit breaker and the line side, one end of which is connected to the lightning arrester, and the other end of which is supported by the partition wall; and the bushing or the A fixed contactor to which a cable head is connected, a busbar side three-position type disconnector that is housed in the busbar container and doubles as a busbar side disconnector and a circuit breaker grounding switch, wherein the grounded side fixed contactor is the Attached to busbar container A bus bar side three-position disconnector attached to the ground terminal, the bus bar side fixed contactor is supported by the partition wall, and the movable contactor is mounted to the through conductor of the insulating spacer provided on the partition wall. A line side three-position type disconnector housed in the circuit breaker container and also serving as a line side disconnector and a circuit breaker grounding switch, wherein a fixed contact on the line side is attached to a conductor connected to the lightning arrester. A ground-side fixed contactor is attached to the circuit breaker support frame, and a movable contactor is a line-side three-position disconnector attached to a terminal of the circuit breaker; A gas-insulated switchgear comprising: an operating device for a busbar-side three-position disconnector; and an operating device for the line-side three-position disconnector arranged on the front side of the circuit breaker container. 2. A transformer connecting portion formed on the back side or front side of the busbar container and extending to the back side or front side; and a partition wall that hermetically closes the tip of the transformer connecting portion and supports an insulating spacer. A transformer-side three-position type disconnector housed in the transformer connecting portion and serving as both a transformer-side disconnecting switch and a grounding switch, in which a fixed contact on the ground side is attached to a ground terminal attached to the transformer connecting portion. 3. The gas according to claim 1, further comprising: a transformer-side three-position disconnector in which a fixed contact on the busbar side is insulated and supported by the partition wall, and a movable contact is attached to a through conductor of the insulating spacer. Insulation switchgear. 3. The gas-insulated switchgear according to claim 2, wherein the transformer connecting portion is formed on a rear surface side of the busbar container, and a cable head is connected to the line-side end portion.