JP2525942B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a gas-insulated switchgear formed by pulling out a line using a bushing for air insulation.

(Prior art) A gas-insulated switchgear in which a switchgear, disconnector, busbar, and other power switchgear are housed in a hermetically sealed metal container containing a gas with excellent insulation properties such as SF6 gas Since the interphase insulation distance can be made much smaller than that of switchgear, it is possible to downsize electrical stations such as switchyards and substations. Therefore, it is suitable for providing an electric power station in a place where it is difficult to secure a large site area such as in a mountainous area, or in a city area where land prices are soaring or in the vicinity thereof, and is recently adopted in various places. However, even in such a gas-insulated switchgear, when a line is drawn from the gas-insulated switchgear to the transmission line, it is essential to use a bushing with a sufficient air insulation distance.

FIG. 4 shows an example of the arrangement of a gas-insulated switchgear equipped with such a bushing. In the figure, 1 and 1 are three-phase batch type main buses, respectively. The lines of the respective phases are drawn out via the busbar switching disconnectors 2a to 2c. These lines are isolated from the air through the breakers 3a to 3c of each phase, the line side disconnectors 4a to 4c, the three-phase collective type connecting busbar 5 and the single-phase busbars 6a and 6c for bushing communication. The bushings 7a to 7c are reached and connected to the power transmission line via the bushings 7a to 7c.

(Problems to be solved by the invention) By the way, in the conventional gas-insulated switchgear as described above, the bushings 7a to 7c of each phase are air-insulated on a straight line parallel to the center lines of the main buses 1 and 1. Since they were arranged at equal intervals with a distance maintained, the dimension B between the bushings 7a and 7c at both ends is inevitably larger than the dimension A of the gas-insulated parts such as the circuit breakers 3a to 3c. It has been a limit to downsizing the site when determining the site area W'of the device.

This point is more noticeable when a plurality of lines (4 lines in the figure) are drawn from the main bus bar as shown in FIG. 5, and due to the large number of bushings arranged on a straight line, all bushings that are air-insulated. The dimension B between the two end portions of the above is much larger than the dimension A of the gas-insulated portion, resulting in an increase in the site area W '.

The present invention solves the problems of the prior art as described above,
It is an object of the present invention to provide a gas-insulated switchgear that achieves a reduction in site area by improving the arrangement of bushing parts that are air-insulated.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a gas-insulated switchgear of the present invention comprises a circuit breaker, a disconnector, and a continuation bus bar in which an insulating gas is filled. , In a gas-insulated switchgear in which multiple lines are connected to the main bus bar by pulling out the line for each phase using a bushing for air insulation, the bushing of each phase is provided with the insulation distance between each phase for each line. The triangles are arranged in a secured state, and the central phase bushing of each line is arranged in a triangle at a position farther from the main bus than the other phase bushings, and the central phase bushing of each line is the bushing of each other phase. It is characterized in that lines which are arranged in an inverted triangle at positions closer to the main bus are arranged alternately adjacent to each other.

(Operation) In the present invention having the above-described configuration, since the bushings of each line are arranged in a triangular shape or an inverted triangle shape while maintaining the interphase insulation distance of the bushing of each phase, The dimension in the direction parallel to the central axis of the bus bar can be made the air insulation distance between the two bushings. Since such lines are alternately arranged adjacent to each other, the bushings of adjacent phases of the adjacent lines can be located on straight lines that are parallel to the main bus and different from each other.

(Examples) Examples of the present invention will be specifically described below with reference to the drawings. It should be noted that the same members as those in the above-mentioned conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIG. 1, a central phase bushing is arranged in a triangle at a position farther from the main bus line than bushings of other phases, and a central phase bushing is arranged as shown in FIG. And a line in which an inverted triangle is arranged at a position farther from the main bus than the bushings of other phases,
As shown in the figure, they are alternately arranged adjacent to each other. The present embodiment will be described below in the order of its partial configuration and overall configuration.

(1) Configuration for a line of triangular arrangement As shown in FIG. 1, among the three-phase bushings, the a-phase and c-phase bushings 7a, 7c located at both ends of the gas-insulated switchgear are the main bus 1, They are arranged on a straight line L parallel to 1 at intervals so as to secure a sufficient air insulation distance between them.
On the other hand, the b-phase bushing 7b located at the center is located on the vertical bisector M of the line L connecting the bushings 7a, 7c at both ends and on the side opposite to the main buses 1, 1 with the straight line L interposed therebetween. Are arranged via the connecting bus bar 6. The distance between the central bushing 7b and the bushings 7a, 7b at both ends is set to a dimension that can secure a sufficient air insulation distance between the two.

(2) Configuration for Rotation of Inverted Triangular Arrangement As shown in FIG. 2, contrary to the triangular arrangement of FIG. 1, the central bushing 7b is the main bus side of the line L connecting the bushings 7a and 7c at both ends. It is located in. Also in this case, the intervals between the bushings 7a to 7c arranged in the inverted triangle are set so that the air insulation distance is sufficiently secured.

(3) Overall configuration As shown in FIG. 3, four lines are drawn from the main bus in this embodiment, and the lines of the triangular arrangement shown in FIG. 1 and the inverted triangular arrangement shown in FIG. Lines are alternately combined in order from the left in the figure and connected to the main buses 1, 1. In addition, bushings 7a, 7
c and bushing 7b in the reverse triangle arrangement line, bushing 7b in the triangle arrangement line and bushings 7a and 7c in the reverse triangle arrangement line are set so that they are located on straight lines parallel to the main bus lines 1 and 1, respectively. Has been done.

(4) Operation and effect of the present embodiment In the gas insulated switchgear of the present embodiment having the above configuration, as shown in FIG. 1 and FIG. The dimension between the bushings is the air insulation distance × 1. Since the dimension between the bushings is the air insulation distance × 2 in the conventional gas insulated switchgear, the site area W is reduced accordingly. The site area W'of the conventional device is shown by the alternate long and short dash line in FIG. 1. In the gas insulated switchgear of this embodiment, the area is about 65%.
Has been reduced.

Further, as shown in FIG. 3, as a result of alternately arranging the triangularly arranged lines and the inverted triangularly arranged lines, even if the lines are brought close to each other, the adjacent lines on a straight line parallel to the main bus line The bushing is positioned so as to sandwich another bushing which is not always on the same straight line L. This means the following: That is, when the lines with the same arrangement are arranged adjacent to each other, the bushing located at the end of a certain line.
It becomes necessary to secure an insulation distance between the 7c and the bushings 7a located at both ends of the adjacent line, and as a result, a space is provided in the gas-insulated portion of the adjacent gas-insulated switchgear. However, in this embodiment, since the bushings of the adjacent phases of the adjacent lines are located on the straight lines parallel to the main bus and different from each other, a sufficient insulation distance can be secured without newly providing a space. .

As described above, in this embodiment, it is possible to reduce the size of the bushing portion and reduce the site area while ensuring a sufficient insulation distance.

(5) Other Embodiments The present invention is not limited to the above embodiments, and the number of lines drawn from the main bus can be appropriately selected. Further, when the three-phase bushings are arranged in a triangle, a regular triangle arrangement is preferable, but an isosceles triangle arrangement is also possible.

[Effects of the Invention] As described above, according to the present invention, the bushing of the central phase is formed in a triangular shape at a position closer to the main bus than the bushings of the other phases in a state where the interphase insulation distance of the bushing of each phase is secured. Sufficient insulation is provided by the simple means of alternately arranging the line arranged and the line arranged in the inverted triangle at a position where the central phase bushing is farther from the main bus than the bushings of each other phase. It is possible to provide a gas-insulated switchgear that has high performance and has a significantly reduced site area.

That is, the bushings of each line are arranged in a triangle while securing the interphase insulation distance of the bushings of each phase, or
Due to the inverted triangle arrangement, the dimension in the direction parallel to the central axis of the main busbar of each bushing can be set as the air insulation distance between the two bushings. First, ensure a sufficient insulation distance for each line. While shortening the size of the bushing part,
The site area can be reduced. Further, by alternately arranging the respective lines adjacent to each other, the bushings of the adjacent phases of the adjacent lines are located on the straight lines which are parallel to the main bus and different from each other, and thus the gas insulation for extracting the plurality of lines is achieved. Also in the switchgear, it is possible to reduce the site area while ensuring a sufficient insulation distance.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the gas insulated switchgear of the present invention, FIG. 2 is a plan view of the same second embodiment, and FIG. 3 is a plan view of the same third embodiment, and FIG. FIG. 5 is a plan view showing an example of a conventional gas insulated switchgear, and FIG. 5 is a plan view showing another example of a conventional gas insulated switchgear. 1 ... Main bus, 2 ... Bus side disconnector, 3 ... Breaker, 4
...... Track side disconnector, 5 ...... 3 phase collective bus bar for communication, 6 ......
Single-phase bus for communication, 7a-7c …… Bushing.

Claims (1)

(57) [Claims] 1. A circuit comprising a circuit breaker, a disconnector, and a continuation busbar filled with an insulating gas, wherein a plurality of lines are drawn out for each phase using a bushing for air insulation and are connected to a main busbar. In the gas-insulated switchgear, for each line, the bushings of each phase are arranged in a triangle with the insulation distance between each phase secured, and the bushing of the central phase of each line is better than the bushings of the other phases. Also alternately adjoin a line in which a triangle is arranged at a position far from the main bus and a line in which the bushing of the central phase of each line is arranged in an inverted triangle at a position closer to the main bus than the bushings of the other phases. The gas-insulated switchgear is characterized in that