WO2020065748A1

WO2020065748A1 - Switchgear

Info

Publication number: WO2020065748A1
Application number: PCT/JP2018/035587
Authority: WO
Inventors: 透木村; オソンパク; 達哉 ▲濱▼田
Original assignee: 三菱電機株式会社
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2020-04-02
Also published as: JP6556408B1; JPWO2020065748A1; DE112018008025T5

Abstract

In the present invention there is obtained a switchgear in which it is possible for a portion of work of installing a two-tier stacked switchgear that involves the work of connecting conductors within the switchgear in the lower tier to be performed without removing a bus. A switchgear (1) in which breakers (10) are disposed in a two-tier stack in an upper tier and a lower tier of the switchgear (1), characterized in that three main buses (4b) of the lower tier that are longer in the width direction than the thickness direction, that have a flat surface, and that extend in the horizontal direction are configured in a main bus disposition structure in which the flat surfaces are set in mutual opposition so as to be aligned in parallel in the vertical direction.

Description

Switchgear

This application relates to a switchgear in which circuit breakers are stacked in two stages.

A switchgear in which circuit breakers are stacked in two stages can significantly reduce the space required for arrangement as compared with a conventional switchgear having only one circuit breaker, and is effective as a space-saving switchgear. It is.
In the installation work of the switchgear in which the circuit breakers are stacked in two stages, the main bus connected to the upper circuit breaker works from the ceiling portion of the switchgear, and the main bus connected to the lower circuit breaker is a switch. The connection operation is performed from the back of the gear (for example, see Patent Document 1).

Japanese Patent Application No. 2018-517909

In the installation work of a switchgear in which breakers are arranged in two stages, when the main bus connected to the lower breaker is connected between adjacent switchgears, as described above, the connection work is generally performed from behind the switchgear. I do. At this time, it is necessary to remove the main bus conductor to which the power cable is connected, so that a high technical level is required and a long time is required.

The present application has been made to solve the above-described problem, and has an object to make it possible to easily and quickly connect a main bus in a switchgear installation operation.

The switchgear of the present application is a switchgear in which circuit breakers are stacked in two stages, an upper stage and a lower stage of the switchgear, wherein the width direction is longer than the thickness direction, has a flat surface, and extends in the lateral direction. The lower three main buses have a main bus arrangement structure in which the flat surfaces face each other and are arranged in parallel in the vertical direction.

スイッチ The switchgear of the present application can easily and quickly connect the main bus conductor in the installation work.

FIG. 2 is a side sectional view of the switchgear according to the first embodiment. FIG. 2 is a layout view of a main bus and power cable connection conductors observed from a cross section XX in FIG. 1. It is a perspective view of the support frame which holds a main bus. FIG. 2 is a perspective view showing an arrangement of a main bus and branch buses observed from a YY cross section in FIG. 1.

部分 In the description of the embodiments and the drawings, the same reference numerals denote the same or corresponding parts.

Embodiment 1 FIG.
Hereinafter, the arrangement of the main bus of the switchgear according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view of the switchgear of the present embodiment, and FIG. 2 is a layout view of a main bus bar and a power cable connection conductor when observed from a cross section XX of the switchgear.

スイッチ As shown in FIG. 1, the switchgear 1 is a two-stage stacking arrangement having circuit breakers 10 in the upper and lower stages, and has three-phase

main buses

4a and 4b in the upper and lower stages. The switchgear 1 has an operation surface 11 on the left side in FIG. 1, and includes a circuit breaker 10 and a control room 8 in portions adjacent to the upper and lower operation surfaces.

On the other hand, a back door 9 is provided at the right end, and a cable room 3 is disposed inside the back door 9. In the upper and lower cable rooms 3, power cable connecting conductors 5 each having a current transformer 13 attached thereto are connected to a grounding switch 12.

The main bus chamber 2 is arranged in the upper and lower stages of the central part of the switchgear 1. Although the

main buses

4a and 4b are shown as rectangular in cross section in FIG. 1, they are rod-shaped conductors having a flat surface longer in the width direction than in the thickness direction, and extend long in the vertical direction of the paper. I have.

In the present embodiment, the upper main bus 4a has a triangular arrangement, and one of the three main buses 4a is disposed in front of the switchgear 1. In the case of the arrangement of the main bus bar 4a, the work can be relatively easily performed by performing the connection work from the upper surface of the switchgear 1 in the installation work.

On the other hand, the lower main bus 4b needs to be installed from the back of the switchgear 1. If the lower main bus 4b is also arranged in a triangular manner as in the upper row, it is difficult to connect the main bus 4b arranged in front of the switchgear 1 from the back, and a part of the main bus 4b is removed. It is necessary to carry out connection work, which requires a high technical level and requires a long working time.

However, in the present embodiment shown in FIG. 1, the lower main buses 4b are attached in a layout extending in the direction perpendicular to the paper with the flat surfaces facing each other, and the three main buses 4b are It differs from the conventional main bus arrangement of the triangular arrangement in that it is arranged in parallel in the vertical direction.

FIG. 2 shows the relationship between the arrangement of the main buses 4b and the power cable connection conductors 5 as viewed from the back of the switch gear 1 along the line XX.
As shown in FIG. 2, the power cable connection conductor 5 is common to the main bus bar 4b in that it is a rod-shaped conductor having a flat surface. However, the three power cable connection conductors 5 are attached side by side with the flat surface facing in the front-rear direction of the device, and are arranged orthogonal to the arrangement of the main buses 4b.

That is, in the present embodiment, as can be seen from FIGS. 1 and 2, three main buses are provided on the back side (the back side of the paper surface of FIG. 2) of the three power cable connection conductors 5 arranged in the horizontal direction. 4b are arranged in the vertical direction, and in the installation work, the connection work of the main bus 4b can be performed through the gap of the power cable connection conductor 5 from the back side. Therefore, it is not necessary to remove the main bus 4b, and the installation work can be easily performed.

In the present embodiment, as described in the description of FIG. 1, the three main buses 4b each extend in the horizontal direction, and are arranged in the vertical direction with their flat surfaces facing each other. As with the main bus 4b, it is necessary to take out and arrange three branch buses 6 for connecting each main bus 4b to the circuit breaker 10 and the like. It is difficult to arrange the branch bus 6. In addition, the lower main buses 4b are arranged so that the main buses 4b are close to each other as compared with a conventional triangular arrangement, and it is expected that the influence of the electromagnetic force between them will increase. In the present embodiment, a solution to these problems will be described mainly with reference to FIGS.

In the case of the present embodiment in which three main buses 4b are arranged in the vertical direction, it is expected that the effect of the electromagnetic force will be greatest on the central main bus 4b among the three. Therefore, as shown in FIGS. 2 and 4, in mounting the main bus bar 4b at the center, an iron support frame 7 with particularly increased strength was used.

FIG. 3 shows a perspective view of the support frame 7. The support frame 7 is made of iron, and the strength can be increased by bending four sides. Using two screw holes formed on the left and right sides of the support frame shown in FIG. 3, the main bus bar 4 b located at the center of the three is fixed via the insulator 14.
By using the support frame 7, the main bus bar 4b can be firmly attached, and it is possible to cope with the influence of the electromagnetic force.

FIG. 4 is a perspective view of the lower main bus chamber 2 observed from the YY cross section of FIG. 1 and shows the arrangement of the main bus 4 b and the branch bus 6. As described above, each main bus bar 4b has a flat bar shape and extends in the horizontal direction in FIG. Further, the three main buses 4b are linearly arranged in the vertical direction with flat surfaces facing each other.

A branch bus 6 is connected to each main bus 4b.
As for the connection position between the main bus 4b and the branch bus 6, the main bus 4b and the branch bus 6 are connected at different positions without the lateral positions overlapping each other. That is, in the example of FIG. 4, the uppermost main bus 4b is on the right, the lowermost main bus 4b is on the left, the center main bus 4b is at the center, and the main bus 4b and the branch bus 6 are connected. .
Thereby, the gaps between the main buses 4b, between the branch buses 6, and between the main bus 4b and the branch buses 6 can be increased, and the influence of the mutual electromagnetic force can be reduced.

(3) It is important that the connection positions of the three main buses 4b and the branch buses 6 are different from each other so that the positions in the horizontal direction do not overlap with each other, and need not necessarily be the left, right, and center as described above. Further, the intervals do not need to be equal, and the connection positions may be arranged rightward or leftward. Further, the relationship between this connection position and the arrangement of the power cable connection conductor 5 adjacent to the main bus 4b is not particularly limited, and coincides with the position where the main bus 4b and the power cable connection conductor 5 overlap and intersect. Alternatively, a connection position between the main bus 4b and the branch bus 6 may be arranged in a gap portion of the arrangement of the power cable connection conductors 5.

The main bus 4b located at the center of the three main buses 4b is fixed to the iron support frame 7 via the insulator 14 as described above. For this reason, the branch busbar 6 connected to the main busbar 4b and the support frame 7 are close to each other, and there is a fear that the influence of the electromagnetic force will be greater than that of the other main busbars 4b. Therefore, in the present embodiment, the branch bus 6 has a shape bent downward so as to pass through a position distant from the support frame 7, and the support frame 7 also secures a distance from the branch bus 6. Therefore, a part is concave.

In the present embodiment, as shown in FIG. 3, the concave shape formed in the support frame 7 is trapezoidal, but is not limited thereto, and a concave shape such as a square or a circle may be used. it can. Further, in the present embodiment, one concave shape is provided, but a plurality of concave shapes may be provided as necessary.

As described above, by providing the concave portion in the support frame 7 and forming the branch bus bar 6 to be bent away from the support frame 7, the insulation distance between the support frame 7 and the branch bus bar 6 can be kept large. The effect of the electromagnetic force can be reduced.

As described above, in the switchgear 1 in which the circuit breakers 10 according to the present embodiment are arranged in two stages, the three main buses 4b are arranged in the vertical direction while extending in the horizontal direction. By arranging the cable connecting conductors 5 in the horizontal direction while extending in the vertical direction, it is not necessary to remove the main bus 4b in the installation work, and the work can be easily performed.

At the same time, the influence of the electromagnetic force can be reduced by setting the connection positions of the main buses 4b and the branch buses 6 to different positions without overlapping each other when viewed in the lateral direction.

The central main bus bar 4b is fixed with high strength using an iron support frame 7, and a concave portion is provided in the support frame 7 at a portion where the branch bus bar 6 and the support frame 7 are close to each other. The bent shape away from 7 keeps the insulation distance large and prevents the influence of electromagnetic force.

Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in the embodiments are not limited to the application of particular embodiments. , Alone or in various combinations.
Accordingly, innumerable modifications not illustrated are contemplated within the scope of the technology disclosed herein. For example, a case where at least one component is deformed, added or omitted, and a case where at least one component is extracted and combined with a component of another embodiment are included.

1 switch gear, 2 main bus room, 3 cable room, 4a, 4b main bus, 5 power cable connection conductor, 6 branch bus, 7 support frame, 8 control room, 9 rear door, 10 breaker, 11 operation surface, 12 Ground switch, 13 current transformer, 14 insulator.

Claims

A switchgear in which circuit breakers are arranged in two stages in an upper stage and a lower stage of the switchgear,
Three main buses arranged in the lower stage of the switchgear having a flat surface and extending in the horizontal direction, the width direction being longer than the thickness direction, are arranged in parallel in the vertical direction with the flat surfaces facing each other. A switchgear characterized by having a main bus arrangement structure.
2. The position at which three branch buses connecting the three main buses and the circuit breaker are connected to the three main buses, respectively, is different from each other in a lateral direction. 3. Switchgear.
The horizontal position at which each of the three branch buses is connected to each of the three main buses corresponds to a gap between three power cable connection conductors arranged side by side. 3. The switchgear according to 2.
3. The main bus bar located at the center of the three main bus bars arranged in parallel in the vertical direction is fixed to a metal support frame via an insulator. 3. The switchgear according to 3.
The switchgear according to claim 4, wherein a recess is formed in the metal support frame at a position adjacent to the branch busbar.