JPH0655005B2 - Gas insulated switchgear - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a gas insulated switchgear.

[Background of the Invention]

FIG. 1 shows a general skeleton of a gas insulated switchgear having an instrument transformer. Main bus 1 and disconnector 2
The other end of the disconnector 4 is connected to the disconnector 7
It is connected to the cable head 9 via. The ground switches 3, 5 and 8 are connected to both ends of the shisha breaker 4 and the cable head 9 side of the disconnector 7, respectively.
And the disconnector 7 between the instrument transformer 6 and the current transformer 11
Are connected.

FIG. 2 shows an example of a conventional gas-insulated switch adapted to this skeleton. As shown in the drawing, the three-phase breaking and breaking unit 4 is configured by vertically arranging the three-phase breaking and breaking portion 4a in the sealed container 22. The child has been derived. Of these, the upper terminal is connected to the disconnector 7 formed in the conductor tube 10,
Furthermore, it is connected to the cable head 9. Between the upper terminal and the disconnector 7, a grounding switch 5 and an instrument transformer 6 are provided.
, And a current transformer 11 is fitted to the conductor of each phase that connects the two, and a grounding switch 8 is connected between the disconnector 7 and the cable head 9. . On the other hand, the lower terminal of the breaker 4 is connected to the main bus 1 via the disconnector 2, and the ground switch 3 is connected between the breaker 4 and the disconnector 2.

In the gas-insulated switchgear configured as described above, as is apparent from the figure, the upper conductor tube 10 is connected to the lower disconnector 2
The main bus bar is connected to the cable head 9 with a length exceeding 1, and the cable is hung on the side opposite to the main bus bar 1 or on the disconnecting side. For this reason, the conductor tube 10 is long, and the occupied area as a whole is large.

It may be possible to reduce the occupied area by locating the main bus bar 1 on the opposite side of the closed container 22 (on the left side of the drawing).
There is a problem in reducing the size of the gas insulated switchgear because a container for accommodating the current transformer 11 is required between and.

[Object of the Invention]

An object of the present invention is to make it possible to dispose the current transformer in the container of the breaker or the breaker, thereby eliminating the need for the container of the current transformer and enabling the gas insulated switchgear to be downsized.

[Outline of Invention]

That is, according to the present invention, a three-phase ridge or disconnector is housed in a cylindrical hermetic container to form a vertical three-phase ridge or disconnector, and one terminal of this ridge or disconnector is connected to a main busbar. , When the other terminal is connected to the cable head through the conductor of each phase and the current transformer is fitted to the conductor of each phase, the three-phase ridges and breaks have one apex of the sealed container. It is characterized in that it is arranged in an isosceles triangle close to the wall, and the current transformer of each phase is arranged in the shape of an equilateral triangle above the ridge and the break, whereby the current transformer is a sealed container. Will be placed inside.

Example of Invention

Hereinafter, the present invention will be described based on the illustrated embodiments. One embodiment of the present invention is shown in FIGS. 3 and 4. Since the same parts as those of the prior art are designated by the same reference numerals, the description thereof will be omitted. In this embodiment, the three-phase ridges and breaks 4a are arranged in an isosceles triangle with one vertex close to the sealed container wall, and the current transformer 11 of each phase fitted to the conductor is broken and the breaks 4a.
A regular triangle is arranged above. By doing so, the current transformer 11 is arranged in the sealed container 22, and a gas-insulated switchgear capable of being downsized can be obtained.

That is, the hermetically-sealed container 22 that accommodates the three-phase ridge and the cut portion 4a
In order to lead out both the terminals of the breaker and the breaker 4, the branch portion (opening portion) 23 is provided in the upper and lower sides of the sealed container 22 so as to face each other in the radial direction.
a, 23b and 24 are formed, and the branch portion 23
Reference numerals a, 23b and 24 are directly connected to the containers 21a and 21b for containing the main buses 1a and 1b and the container 16 for containing the cable head 9. That is, the lower branch portion 23
a, 23b, the upper branch portion 24, and the closed container 22 are adjacent to the disconnection chamber and the cable chamber via the lower and upper partition plates. The breaker 4 is connected to the main buses 1a and 1b and the cable head 9 through the branch portions 23a, 23b and 24. In the figure, 2a,
2b is a disconnector.

In the gas insulated switchgear configured as described above, in this embodiment, as shown in FIG. 4, the transformer 11 is arranged so that each phase is located in the sealed container 22 so that each phase has a vertex of an approximately equilateral triangle. Although the current transformer coils 11u, 11v, 11w are arranged, the conductors of each phase passing through these current transformer coils 11u, 11v, 11w are three-phase conductors in which each phase is arranged at the apex of an isosceles triangle. And the conductors of the cut portions 4u, 4v, 4w. Various methods can be considered for connecting the conductors, such as by collecting current, by tightening bolts, and by bending conductors. Thus, the current transformer 11, that is, the current transformer coil 11
The arrangement of u, 11v, and 11w in a substantially equilateral triangle is
This is because the current transformer coils 11u, 11v, 11w are generally larger than the breaker and the breaker 4, so that the insulation of each phase and the ground insulation are improved. And, the breaker 4 or the breaker portion 4a (4u, 4v, 4w) is arranged in an approximately isosceles triangle because the breaker 4 is a branch conductor 12 to the main bus 1.
Since it is juxtaposed with u, 12v, 12w, it is necessary to secure an electrically necessary insulation distance between the breaker 4 and the branch conductors 12u, 12v, 12w. The branch conductors 4u, 4v, 4w of each phase of 4 are connected to the branch conductor 12
This is because it is preferable to form an isosceles triangle whose bases are the u, 12v, and 12w sides. In addition, if the disconnector 4 is arranged in an isosceles triangular shape in this way, between the branch conductors 12u-12v,
The distance between 12u and 12w can also be increased. The grounding switch 3 (3u, 3v, 3w) is provided in the space of the sealed container 22 provided by arranging the chords and breaks 4a in an isosceles triangle shape and juxtaposed with the breaker 4a. Thus, the current transformer 11
Can be disposed in the sealed container 22, so that a container for housing the current transformer 11 as in the conventional case is not required.

Although the case where one terminal of the breaker 4 is connected to the cable head 9 has been described in the present embodiment, the same can be applied to the case of pushing instead of the cable head 9.

Further, in this embodiment, the dual three-phase collective main buses 1a and 1b are also used.
Although the case has been described, it goes without saying that the same can be applied to the case of a single bus structure.

Nor. In other words, the central side branch conductor 12u connected to the central side branch conductor 12u arranged on the cable chamber side and the both side branch conductors 12v, 12w arranged on both sides of the central side branch conductor 12u on the disconnection chamber side. Both sides and the cuts 4v and 4w so as to form an isosceles triangle with the center and the cuts 4u.
And one side branch conductor 12 of each of the breaks 4u to 4w
Since the current transformers 11u to 11w are arranged at the positions of the substantially triangular shape in which u to 12w are shifted inward from the respective breaks 4u to 4w, the closed container 22 does not become large and the grounding area of the gas insulated switch is reduced. I can do it.

Further, the inner branch conductors 12v to 1w of the respective current transformers 11u to 11w
Since the grounding switches 3u to 3w are arranged in 2w, the airtight container 22 does not become larger and the grounding area of the gas insulated switch can be reduced.

〔The invention's effect〕

As described above, according to the present invention, since the current transformer is arranged in the sealed container, the conventional container for accommodating the current transformer is not required, and the gas-insulated switchgear capable of downsizing is provided. Obtainable.

[Brief description of drawings]

1 is a skeleton diagram of a gas insulated switchgear, FIG. 2 is a front view of a conventional gas insulated switchgear, FIG. 3 is a front view of an embodiment of the gas insulated switchgear of the present invention, and FIG. 4 is the same. It is a top view of the current transformer periphery of one Example. 1,1a, 1b ... Main bus, 2,2a, 2b ... Disconnector, 3,3u, 3v, 3w ... Grounding switch, 4 ... 3-Phase breaker, 4a (4u, 4v, 4w) …… 3-phase breaks and breaks, 5 …… grounding switch, 6 …… instrument transformer, 7 ……
Disconnector, 9 ... Cable head, 11 ... Current transformer, 11
u, 11v, 11w ... Current transformer coil, 12, 12u,
12v, 12w ... Branch conductor, 16 ... Container for storing cable head, 21a, 21b ... Container for storing main bus bar, 22 ... Sealed container, 23a, 23b, 24 ... Branch portion.

Claims (2)

[Claims] 1. A partition wall plate is provided between a disconnecting chamber and a cable chamber of a closed container, and three-phase branch conductors penetrating the partition plate extend vertically in the closed container and are connected to the branch conductors. In the case where the breaker and the current transformer that house the parts are arranged, the central side interrupting part connected to the central side branch conductor arranged on the cable chamber side and the disconnecting part chamber side and both sides of the central side branch conductor are arranged. Both side cut-off portions connected to the central side cut-off portion so as to form an isosceles triangle on the two-sided branched conductors, and one side branch conductor of each cut-off portion at a substantially triangular position displaced inward from each cut-off portion. A gas-insulated switch which is provided with a current transformer arranged. 2. The gas-insulated switch according to claim 1, wherein a ground switch is arranged on the inner branch conductor of each of the current transformers.