JPH0632734Y2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a gas-insulated switchgear installed in an electric station such as a substation.

[Prior Art] Generally, a gas-insulated switchgear is constructed by arranging a plurality of elements, which are configured by accommodating necessary devices including switchgear, disconnector, and other switchgear in a container filled with insulating gas, in parallel with each other. When the line is configured by connecting and the line is pulled in by a bushing, the element to which the bushing is connected is often arranged at the end.

For example, a gas-insulated switchgear used for a bushing lead-in power-receiving line of a single busbar structure has a circuit breaker CB as shown in FIG.
Circuit breaker element E1 configured by accommodating the circuit breaker inspection grounding switches ES11 and ES12 that ground both ends in the circuit breaker storage container 1, and the bus bar BUS in the bus bar storage container 2 together with the bus side disconnector DS1. Stored and configured busbar element E2
And a line-side disconnector DS2 together with a line-side grounding switch ES2 in a disconnector housing container 3 to form a disconnector element E3.
And a bushing BS connected to the disconnector element E3,
It is composed of a current transformer CT that measures line current.

The arrangement of the elements of the conventional gas-insulated switchgear of this kind is as shown in FIG. 5, and the breaker container 1, the busbar container 2, and the disconnector container 3 are directly connected with the breaker container 1 in between. The circuit breaker storage container 1 and the bus bar storage container 2 and the circuit breaker container 1 and the disconnector storage container 3 are connected to each other via insulating spacers S1 and S2, respectively.

One end of the main pipe line portion 4m of the T-shaped bushing connection container 4 is connected to the disconnector housing container 3 via an insulating spacer S3. The main pipe line portion 4m of the bushing connection container 4 is configured as a three-phase collective type that collectively stores the three-phase conductors that connect the three-phase bushing BS and the disconnector DS2.
Is connected to the side surface of the container 3 of the endmost element in the juxtaposed direction of the elements. Connecting pipes to the horizontal branch pipes 4u and 4w, which are branched at right angles from the main pipe 4m.
5u and 5w are connected, and nozzles 6u, 6v and 6w are provided on the upper part of the connecting pipe 5u, the intersection of the main pipe part and the branch pipe part of the bushing connecting container 4 and the upper part of the connecting pipe 5w, respectively. ing. The nozzles 6u to 6w are arranged in a straight line at equal intervals, and the bushings BSu to BSw are attached to these nozzles via bushing support pipes extending in the vertical direction, respectively. The central conductors of the bushings BSu to BSw are connected to the connection conductors arranged in the bushing connection container 4 through the bushing support tubes that support the bushings BSu to BSw, and the connection conductors are arranged in the disconnector element E3 through the through conductors of the insulating spacer S3. It is connected to the conductor connected to the disconnector DS2.

The disconnector DS is provided on the side surface of the container 3 facing the outer end of the disconnector element E3 located at the outermost end in the juxtaposed direction of the elements.
2 and the operation device 8 of the grounding switch ES2 are attached.
A space for inspecting and operating the operating device is required near the operating device 8. Therefore, in this gas-insulated switchgear, the main pipe line portion 4m of the bushing connection container 4 is extended to secure a space for inspection operation on the side of the main pipe line portion 4m, and an inspection provided with stairs 9a in the space. A stand 9 is installed.

It should be noted that the operating device 8 can be attached to the side surface (side surface of the circuit breaker container 1 side) of the container 3 of the element at the end that is located away from the bushing without extending the length of the main conduit portion 4m. It is conceivable that, in such a case, when a plurality of gas-insulated switchgears are installed side by side in order to draw in a plurality of lines, the operating device 8 is located in the back of the space between adjacent gas-insulated switchgear. Since it will be arranged and it is necessary to secure a space for inspection operation at the back of the space between adjacent gas-insulated switchgears, the space between adjacent gas-insulated switchgears will increase and equipment will be installed. It is inevitable that the size of the equipment will increase and the installation area of the entire equipment will increase. Therefore, as shown in the figure, the operating device 8 for operating the device of the element at the extreme end needs to be arranged on the outer end side (bushing side) in the juxtaposed direction of the elements as much as possible.

SF ₆ gas is filled at a predetermined pressure in the container of each element, the bushing connection container 4, and the connection pipes 5u and 5w.

[Problems to be Solved by the Invention] As described above, in the conventional gas-insulated switchgear, the middle-phase bushing BSv is arranged on the central axis A1-A1 of the gas-insulated switchgear along the direction in which the elements are arranged. , Bushing BSu and BSw of both phases are placed equidistant from bushing BSv of middle phase, respectively, and bushing BSu or BSW of three phases are placed.
Were arranged side by side on a straight line A2-A2 orthogonal to the central axis A1-A1. In this case, the main conduit part of the bushing connection container 4
Since it is necessary to secure a space (in the above example, the inspection stand 9 is installed in this space) for operating the operation device of the disconnecting switch DS2 and the operation device of the earthing switch ES2 on the side of 4 m. It is necessary to increase the length of the main pipe line portion 4m of the bushing connection container 4, and it is unavoidable that the distance L'from the center of the element E3 at the end to the centers of the bushings BSu to BSw becomes considerably long. It was Therefore, there is a problem that the length of the gas insulated switchgear becomes long and the installation space increases.

Further, in the case of the above-mentioned configuration, since the main pipe passage portion 4m of the bushing connection container needs to be formed into a three-phase collective type, it is necessary to use an expensive large-diameter pipe for the main pipe passage portion 4m. In addition, since it is necessary to use a large-sized insulating spacer as a gas partition between the main pipeline and the container of the element, and a large pedestal is required to support the main pipeline, the device The cost of it was inevitable.

The purpose of the present invention is to reduce the distance from the element at the end to the bushing to reduce the installation area, and
It is an object of the present invention to provide a gas-insulated switchgear in which a bushing can be attached without using a phase-integrated type pipe line portion, and the cost can be reduced.

[Means for Solving the Problems] According to the present invention, a plurality of elements configured by collectively storing the components of a switching circuit for three phases in a container filled with an insulating gas are arranged in line. Related to a gas-insulated switchgear in which a three-phase overhead wire drawing bushing is connected to the element at the end and the operating device of the component equipment of the element at the end is arranged on the side surface of the element at the end Is.

In the present invention, the three-phase bushings are attached to the nozzles provided in separate connection containers. And 3
Installed the medium-phase bushing of the phase bushings 1
One connecting container is connected to the side surface of the container of the element at the endmost from the arranging direction of the plurality of elements, and the two connecting containers with the two-phase bushings at both ends are perpendicular to the arranging direction of the elements. Are arranged so as to face each other and are connected to the side surface of the container of the element at the end. In addition, the operating device of the constituent equipment of the element at the extreme end is arranged in the space between the connection container to which the middle-phase bushing is attached and the connection container to which one of the two-phase bushings at both ends is attached.

[Operation] With the above configuration, the connection containers to which the three-phase bushings are attached are arranged in directions orthogonal to each other, and opened between the connection containers for the middle-phase bushings and the connection containers for the bushings on both ends. Since a large space is formed, it is possible to secure a space for inspecting and operating the operation device of the device at the endmost element without increasing the length of the connecting container for the medium-phase bushing. By shortening the distance between the center of the element at the end and the bushing, the length of the gas insulated switchgear can be shortened.

Further, with the above configuration, the connecting container to which the bushing of each phase is attached may be a single-phase connecting container, and since the supporting of each connecting container can be simplified, the cost can be reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention, and the electric constitution of each phase of this embodiment is as shown in the single line connection diagram of FIG. The circuit breaker storage container 1 is formed in a cylindrical shape, and is supported on a box-shaped frame 10 that also serves as an operation device box with its axis oriented vertically. Short connecting tube portions 1a and 1b are provided on the upper side portions, respectively. A support 11 is provided at the bottom of the circuit breaker storage container 1, and a three-phase gas circuit breaker CB is mounted on the support 11 in a standing state.
The circuit breaker CB of each phase is one in which fixed and movable contacts are housed together with an appropriate arc extinguishing mechanism in an insulative container 12 filled with SF ₆ gas. An insulating operating rod 13 for operating the movable contact from the lower end of the container 12 Has been derived. The insulated operating shaft 13 of the three-phase circuit breaker CB is connected by the connecting member 14 and connected to the operating shaft 15. The operating shaft 15 penetrates the bearing device 16 of the airtight holding structure attached to the bottom of the container 1. It is installed in the gantry 10. An operating device 17 of a circuit breaker is arranged in the gantry 10, and an operating shaft 15 is connected to an output shaft 17a of the operating device 17 via a lever 18. External terminals connected to fixed contacts on the top and bottom of the container of the circuit breaker CB for each phase
20 and 21 are provided, and one end of a conductor 22 is connected to the external terminal 20. The conductor 22 extends downward in the container 1,
The fixed contact 24a of the ground switch is attached to the lower end of the conductor 22, and the fixed contact and the movable contact 24b for the ground switch attached to the support 11 constitute a ground switch ES11. A fixed contact 25a for a grounding switch is attached to the external terminal 21 at the bottom of the circuit breaker, and this fixed contact and the movable contact 25b for a grounding switch attached to the support 11 make it possible to connect the grounding switch ES1.
2 are configured. A branch pipe portion 1c for leading out the operation shaft is also provided in the lower portion on the front side of the circuit breaker storage container 1, and an operation device 27 for a ground switch is connected to the branch pipe portion 1c to operate the ground switches ES11 and ES12. A shaft (not shown) is connected to the manipulator 27 via a connecting member 26 such as a link or a rotating shaft arranged in the branch pipe portion 1c.

One end of the conductor 28 is connected to the lower end of the conductor 22 connected to the external terminal 20 on the upper part of the circuit breaker CB, and the other end of the conductor 28 is connected to the through conductor of the insulating spacer S1 attached to the connecting pipe portion 1a. Has been done. The lower end of a connection conductor 29 extending vertically in the container 1 is connected to the external terminal 21 at the bottom of the circuit breaker,
The upper end of the connecting conductor 29 is connected to the penetrating conductor of the insulating spacer S2 attached to the connecting pipe portion 1b on the back side of the container 1.

The busbar container 2 is formed in the shape of a cross pipe having a first conduit portion 2a and a second conduit portion 2b, and one end of the first conduit portion 2a has a circuit breaker via an insulating spacer S1. It is connected to the connecting pipe portion 1a of the container 1. The conductors forming the bus BUS are accommodated along the axial direction of the second pipeline 2b orthogonal to the first pipeline, and the busbar disconnector DS1 is aligned along the axial direction of the first pipeline 2a. It is stored. The busbar-side disconnector DS1 in this example has a fixed contact 30 connected to the through conductor of the insulating spacer S1.
a and a movable contact 30b connected to the busbar BUS. The movable contact 30b is connected to a disconnector operating device 31 attached to the lower portion of the busbar storage container 2 via a mechanism (not shown).

The disconnector storage container 3 is made up of a cylindrical container and has a mount 35.
The connection pipe portion 3a which is supported on the upper side of the container 3 and which is provided on the upper portion on the rear surface side of the container 3 is connected to the connection pipe portion 1b on the upper rear surface side of the circuit breaker storage container 1 via the insulating spacer S2. The line-side disconnector DS2 includes a fixed contact 36a and a movable contact 36b. The fixed contact 36a is connected to the other end of a conductor 37, one end of which is connected to the penetrating conductor of the insulating spacer S2, and the movable contact 36b is inside the container 3. A contact support conductor 40 supported by an insulating support 39 on a frame 38 fixed to the
It is connected to the. The line side grounding switch ES2 is composed of a fixed contact 41a and a movable contact 41b. The fixed contact 41a is connected to the contact supporting conductor 40 and the movable contact 4
The frames 1b are supported by the frame 38, respectively. The upper end of the connection conductor 42 is connected to the contact support conductor 40,
The lower end of 42 is connected to one end of a connecting conductor 44 supported on the bottom of the container 3 via an insulating support 43.

The movable contacts of the disconnecting switch DS2 and the grounding switch ES2 are connected to a disconnecting switch operating device 8A and a grounding switch operating device 8B mounted on the side surface of the container 3 via an operating force transmission mechanism (not shown).

In the present invention, the three-phase bushings BSu to BSw are connected to the container 3 of the disconnector element E3 via separate connection containers 50u to 50w. Connection container 50u to 50w
Consists of short tubes extending in the horizontal direction, and nozzles 51u to 51w are provided on the upper part of each. Bushing support pipes 5 extending in the vertical direction are respectively attached to the nozzle bases 51u to 51w.
The lower ends of 2u to 52w are connected, and bushings BSu to BSw are attached to the upper ends of these support tubes 52u to 52w, respectively. A current transformer CT is mounted in the support tubes 52u to 52w.

At the lower part of the container 3 of the disconnector element E3 located at the endmost portion, a connection pipe portion 3bv opening to the back side and connection pipe portions 3bu and 3bw opening in a direction perpendicular to the juxtaposed direction of the elements are provided. Is provided, and short pipes 53u and 53w are connected to the connection pipe portions 3bu and 3bw, respectively.

U- or W-phase bushing BSv of the three-phase bushing
The connection container 50v attached with is connected to the connection pipe portion 3bv of the lower part of the container 3 of the element E3 at the endmost end through an insulating spacer S4v from the juxtaposed direction of the elements. The two connecting vessels 50u and 50w, to which the two-phase bushings BSu and BSw at both ends are respectively attached, are arranged so as to face each other in a direction perpendicular to the direction in which the elements are arranged, and the element at the end is
It is connected to the connecting pipe portions 3bu and 3bw of the container 3 of E3 via short pipes 53u and 53w. The three-phase connection containers 50u to 50w are supported by the column 55. As described above, in the present invention, the connection container to which each of the three-phase bushings is attached
Since it is sufficient to use a single-phase one as 50u to 50w,
These connecting containers can be supported by the simple columns 55, and the supporting structure of the connecting container of the bushing can be simplified.

The center conductor 56 of the U-to-W 3-phase bushing BSu to BSw is passed through the bushing support pipes 52u to 52w to form a connection container 50u.
To conductors 57 disposed in the container 3 to 50w, the conductors 57 of U to W phases are connected to the conductors 44 of U to W phases in the container 3 through the penetrating conductors of the insulating spacers S4u to S4w, respectively.

Operators that operate the disconnector DS2 and the grounding switch ES2 respectively
8A and 8B are located between the U-phase bushing support pipe 52u and the V-phase bushing support pipe 52v, and are attached to the side surface of the disconnector storage container 3, and are used for operating these operating devices. Is installed in the space between adjacent connection containers 50u and 50v.

As described above, in the present invention, since the connecting vessels 50u to 50w to which the three-phase bushings are attached are arranged so as to be orthogonal to each other, the connecting vessel 50v for the middle-phase bushing and the connecting vessel 50u for the bushings on both ends are provided. And a large open space is formed between them and 50w. Therefore, without increasing the length of the connecting vessel 50v of the middle-phase bushing, it is possible to secure a space for operating the device on the outer end side of the element at the end, and the element at the end. The distance L between the center of the container 3 and the center of the bushing in the middle phase can be made shorter than before. Further, since the three-phase bushings are arranged not at the straight line but at the apexes of the triangle, the line width can be made the same as the conventional one and the interphase distance can be made long. Further, the connection containers 50u to 50w may be any one capable of accommodating a single-phase conductor, and the insulating spacer used for connecting these connection containers may also be a single-phase one, facilitating component processing. be able to.

In the above description, the gas insulated switchgear used for the bushing power receiving line of the single busbar configuration is taken as an example, but the present invention is also applied to the gas insulated switchgear of the double busbar configuration in which two busbar elements are connected to the circuit breaker element. Can be applied. In this case, a connecting pipe portion may be provided on the upper portion of the front side of the circuit breaker storage container 1, and a bus bar element may be further connected to the connecting pipe portion via an insulating spacer.

Although the three elements E1 to E3 are arranged in parallel in the above description, the number of elements constituting the gas insulated switchgear in the present invention is arbitrary.

[Effect of the Invention] As described above, according to the present invention, the connection containers for mounting the three-phase bushings are arranged in directions orthogonal to each other, and the connection container for the middle-phase bushings and the connection container for the bushings on both ends are provided. Since a large space is formed between the two, it is possible to secure a space for operating the equipment on the outer end side of the element at the outermost end without increasing the length of the connecting container of the medium-phase bushing. can do. Therefore, the distance between the center of the element at the outermost end and the bushing of the middle phase can be shortened, and the length dimension of the gas insulated switchgear can be shortened to reduce the installation area. is there.

Further, according to the present invention, since the connecting container to which the bushing of each phase is attached is a single-phase connecting container, not only an inexpensive small-diameter pipe can be used as the connecting container, but also the connecting container and the element at the endmost part can be used. It is possible to use a small-sized insulating spacer as a gas-separating insulating spacer. Further, since it is possible to easily support each connection container as compared with the case of using the connection container of the three-phase batch type, the cost of the device is reduced in combination with the reduction in the size of the connection container and the insulating spacer. be able to.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention,
Fig. 1 is a plan view, Fig. 2 is a sectional view taken along the line II-II in Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 shows a structural example of each phase of a gas insulated switchgear. A single line connection diagram and FIG. 5 are plan views showing a conventional example. 1 ... Circuit breaker storage container, 2 ... Busbar storage container, 3 ... Disconnector storage container, 50u to 50w ... Connection container, 52u to 5
2w …… Bushing support tube, CB …… Circuit breaker, BUS …… Bus, DS1 …… Bus side disconnector, DS2 …… Trackside disconnector, ES1
1, ES12 …… Ground switch for circuit breaker inspection, ES2 …… Ground switch for line side.

Claims (1)

[Scope of utility model registration request] 1. A plurality of elements constituted by collectively storing three phase components of a switching circuit in a container filled with an insulating gas are arranged side by side in a straight line, and three phase elements are arranged at the endmost element. In the gas-insulated switchgear in which the overhead wire drawing bushings are connected, and the operating device of the component equipment of the endmost element is arranged on the side surface of the element at the outermost end, the three-phase bushings are separately provided. Attached to a nozzle provided in the connection container of, and one connection container with a bushing of the middle phase of the bushings of the three phases is attached from the juxtaposed direction of the plurality of elements to the end element Two connecting containers connected to the side surface of the container and having two-phase bushings at both ends attached thereto are arranged so as to face each other in the direction perpendicular to the direction in which the elements are arranged side by side, and It is connected to the side surface of the container Remento, second connection container and both ends fitted with bushing in said phase
A gas-insulated switchgear, characterized in that an operating device of a constituent device of the element at the extreme end is arranged in a space between one of the phase bushings and a connecting container.