JPH0468844B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an improved three-phase gas insulated switchgear in which a current-carrying conductor for connection to a multi-bus line is arranged in a shingle disconnection container housing a shingle disconnection section. Regarding equipment.

[Technical background of the invention and its problems]

In recent years, as the demand for electricity in urban areas has increased, gas-insulated switchgear has become widely used to fit into narrow urban spaces and to harmonize with the surrounding environment.

In addition, gas insulated switchgears are becoming increasingly high-voltage and large-capacity, and are required to be further downsized, improved in reliability, and simplified in maintenance.

Figure 1 shows a single-line connection diagram for one line in a general double-bus system, with a CB bridge and disconnector, and one pole side is connected to the cable via a line disconnector DS3 and a line grounding device ES. Connected to part CH. CT1
is a current transformer.

In addition, the other pole side of the breaker CB is a disconnector DS1 for the main bus BUS1 and a disconnector DS2 for the main bus BUS2.
are connected to the main bus lines BUS1 and BUS2, respectively.

Conventionally, as a typical example of the equipment arrangement configuration in such a single line diagram, the configuration shown in FIG. 2 as shown in US Pat. No. 4,241,379 is known.

That is, the sheath breaker CB includes a container 30 filled with an insulating gas and placed horizontally to the skirting surface;
The sheath section 32 of each phase stored inside the container 30
and phase-conducting conductors 33a and 33b led out from both ends of the shingle section 32, respectively. A current-carrying conductor 33a led out from one end of the sheath section 32 is arranged inside the container 30 in parallel with the sheath section 32, and is connected to two branch outlet sections 31a and 31b arranged along the axis of the container 30. 2 inside the container 30 from
It is branched into two parts and each is led out above the container 30. That is, one current-carrying conductor 33a1 of the current-carrying conductors 33a is led out from the branch outlet portion 31a orthogonal to the axis of the container 30. Further, the other current-carrying conductor 33a2 is led out from the branch outlet portion 31b from the middle of the current-carrying conductor 33a1, parallel to the axis and then perpendicular to the axis.

On the other hand, the current-carrying conductor 33b led out from the other side of the shingle section 32 passes through the current transformer 20 of each phase corresponding to CT1 in FIG. Provided branch outlet portion 31c
The other end is led out to a branch outlet 31d provided perpendicularly to the axial direction of the container 30. A voltage transformer 40 is connected to the branch outlet 31d, and a grounding device 41 corresponding to the ES, a disconnector 42 of the DS3, and a cable head 43 of the CH are connected to the conductor led out from the branch outlet 31c. . Further, the branch outlet portions 31a, 3
Two main bus lines BUS1 and BUS2 arranged perpendicularly to the axial direction of the container 30 are connected to 1b via disconnectors 45 of DS1 and DS2.

However, such a conventional configuration has the following drawbacks. That is, FIG. 3 shows a cross-sectional view taken along the line AA in a plane perpendicular to the axis of the container 30 in FIG.

As can be seen from this figure, the current-carrying conductor 33 of each phase
33a11, 33a12, 33 with a distance d ₂ from each other on substantially the same plane parallel to the axis of the container 30;
a13, and the sheath section 32 of each phase,
The straight line connecting the centers of the two phase shears 32R and 32T is arranged so as to pass through the axis O of the container 30, and the other phase sheath 32S is placed in a position parallel to the axis O of the container 30. It is located in

That is, the three bow sections 32 are arranged such that straight lines connecting their centers form an isosceles triangle, and one side of the isosceles triangle intersects with the axis of the container 30.

In such a configuration, a space that is not effectively used is created in a portion B surrounded by a dashed line between the shingle cut portion 32 and the current-carrying conductor 33a, so that the diameter of the container 30 becomes large. Therefore, the building capacity required for substation construction increases. In underground substations constructed under high-rise buildings, a slight increase in building volume
This will lead to a significant increase in substation construction costs.

[Purpose of the invention]

It is an object of the present invention to provide a three-phase gas insulated switchgear which eliminates the drawbacks of the above-mentioned configuration and also reduces the diameter of the container.

[Summary of the invention]

In order to achieve such an object, according to the present invention, each phase conductor is arranged parallel to each phase gap or cut section arranged in the axial direction of the container, and each phase gap or cut section is aligned with the axis of the container. The diameter of the container is reduced by arranging it at each vertex of an isosceles triangle formed to include the core, and by arranging the conductor located in the middle closer to the axis than the conductors of the other two phases. It's getting smaller.

[Embodiments of the invention]

The present invention will be explained below with reference to the drawings.

FIG. 4 shows an embodiment of the present invention. The sheath section 32 is connected to each phase sheath section 32R, 32.
An isosceles triangle formed by connecting the centers of S and 32T is arranged so that the axis O of the container 30 is contained within the isosceles triangle. On the other hand, a current-carrying conductor 33a12 located in the middle of each phase current-carrying conductor 33 for connection with the main bus bar is connected to another current-carrying conductor 33a1.
1, 33a13, it is arranged closer to the axis O of the container 30.

By arranging it in this way, the bow section 3 can be formed within the diameter of the container 30 which is smaller than the configuration shown in FIG.
The inter-phase distance d ₁ of 2 and the inter-phase distance d ₂ of the current-carrying conductor 33 can be made equal to those of the configuration shown in FIG. 3.

Also, the distance between the shingle break 32 and the current-carrying conductor 33, the distance between the shingle break 32, the current-carrying conductor 33, and the container 30,
The same distance can be maintained with no deterioration in insulation performance.

In this way, since the diameter of the container 30 can be reduced, it is possible to provide a three-phase gas insulated switchgear that can be downsized and is particularly suitable for being installed in the basement of a high-rise building.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a small and inexpensive three-phase gas insulated switchgear in which the diameter of the cut-off storage container is reduced and the insulation performance does not deteriorate.

[Brief explanation of the drawing]

Figure 1 is a single line diagram of a substation, Figure 2 is a configuration diagram showing a device to which the present invention is applied, and Figure 3 is a diagram of a substation.
FIG. 4 is a diagram illustrating the arrangement and configuration of the shield section and the current-carrying conductor of the gas-insulated switchgear, and FIG. 30... Container, 31... Outlet, 32... Sheath section, 33... Current-carrying conductor, 45... Disconnector,
BUS...Main bus line, O...Axis center.

Claims (1)

[Claims] 1 In a container filled with an insulating medium, each phase or section is housed parallel to each other in the axial direction of this container, and each phase or section led out from one pole side of each phase or section is A current-carrying conductor is disposed in the container in parallel with the shingle section, and each phase current-carrying conductor is branched into two, a first and a second conductor, respectively, perpendicular to the axis of the container.
The main bus bar is connected to the first and second outlet parts,
In a cross section perpendicular to the container axis, the triangle formed by connecting the centers of the three cross sections arranged in the container and the centers of these cross sections forms an isosceles triangle, and this isosceles triangle. is arranged so as to be included in the container, and the middle conductor of the three phase current-carrying conductors arranged parallel to each phase and the cut portion is closer to the axis of the container than the conductors located on both sides. A three-phase gas insulated switchgear characterized by being placed close to each other.