JPS6322124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated switchgear, and particularly to a gas insulated switchgear using a so-called double busbar, 1 1/2 disconnector system.

The typical electrical connection relationship between the external drawer unit and the busbar using the double busbar and 1 1/2 disconnector system is shown in Figures 1 and 2 of the attached drawings as a single line diagram. The electrical connections are the same in both cases, but the only difference is the physical arrangement of the devices; FIG. 1 shows the conventional device, and FIG. 2 shows the device according to the present invention. It shows.

An example of a conventional device having such a connection relationship is shown in FIGS. 3 to 5, and the symbols A, B, and C in the figures indicate phase names. Now, in Figs. 3 to 5, phase A will be mainly explained as a representative of each phase.
A, 2A are A of two main busbar groups 1A, 1B, 1C and 2A, 2B, 2C arranged on the same plane.
3A is the A phase branch bus bar branched from the main bus bar 1A, 4A is the A phase branch bus bar branched from the main bus bar 2A, and 3B, 3C, 4B,
4C is also a similar branch bus. Also, 5A, 6A
and 7A are three disconnectors electrically connected in series constituting the A-phase disconnector unit, that is, bus-side, center, and bus-side disconnectors; both main bus groups 1
A, 1B, 1C and 2A, 2B, 2C, the bus disconnect switch 5A connects to the main bus 1A via the branch bus 3A, and the bus disconnect switch 7A connects to the main bus via the branch bus 4A. The central disconnector 6A is electrically connected to the busbar 2A, and both ends of the central disconnector 6A are connected to opposite sides of the branch busbar connection sides of both busbar side disconnectors 5A and 7A. Of course, the same applies to each disconnector of other phases. Next is one of the external drawer units. For example, the transmission line drawer sheath disconnector 8A, the power line side disconnector 9A, the power line drawer bushing 10A, which is an air drawer bushing, and the power line drawer connection part 11A, which constitute the power line drawer unit, are connected to the power line drawer. The section 11A is connected to one of the busbar side disconnectors 5A, 7A and the central disconnector 6A, and is also connected to the transformer side which constitutes another external drawer unit, for example, a transformer side drawer unit. The disconnector 12A, cable head 13A, and transformer side drawer connection part 14A are
The transformer side drawer connecting portion 14 connects to the other of the busbar side disconnectors 5A, 7A and the central disconnector 6A.

Furthermore, as mentioned above, the main busbar groups 1A to 1C and 2A to 2C are located above each disconnector unit, so they are located at a very high position.
The main busbar groups 1A to 1C and 2A to 2C are supported by a large number of sturdy frames 15.

Although the above description has mainly been about phase A, the same applies to phase B and phase C.

Because the conventional device is configured in this way, each disconnector unit is located below the main busbar group and perpendicular to the main busbar group, and therefore, two external drawers are connected to each disconnector unit. The units must each be arranged to extend on either side of the disconnector unit. As a result, not only is the main bus group located higher, requiring a large number of strong frames 15, but also the distance between both ends of the external drawer unit, that is, the distance between the power line drawer bushing 10A and the cable head 13A in the conventional example described above, is increased. The conventional device had the disadvantage that the distance L between the gas insulated switchgear and the gas insulated switchgear was extremely large, requiring an excessively large installation area.

Note that the distance D between the power transmission line lead-out bushings 10A and 10C on both sides is limited by the restriction of the air insulation distance of the power transmission line lead-out bushings 10A, 10B, and 10C. For example, at 500 KV,
The required interphase distance is usually 8 m.

The object of the present invention is to obtain a gas insulated switchgear that eliminates the drawbacks of the conventional devices, and for this purpose, the three disconnectors of the disconnector unit are arranged on a plane. The upper and lower sides of the U-shape are arranged so that the bus-side disconnect switch and the middle side are the center disconnect switch, and two sets of main bus bars are placed together on the open side of the U-shape, and they are branched from the main bus bar of the same phase. The branch busbar is connected to the open side of the busbar side disconnector, and two sets of external drawer units are alternately arranged on the U-shaped closed side of the disconnector unit.

Hereinafter, the present invention will be explained based on the accompanying drawings, FIGS. 6 to 9, which show one embodiment of the present invention. Note that, like the conventional device, the A phase will be mainly explained, but the same applies to the B phase and C phase.

In the figure, symbols 20A and 21A represent 20
B, 20C, 21B, and 21C are main busbars, and each busbar group 20A, 20B, 20C, and 21
Each of A, 21B, and 21C are stacked in three layers, one above the other. 22A is a branch bus bar branched from the main bus bar 20A, which also serves as a support for supporting the main bus bar group, and 23A is a branch bus bar branched from the main bus bar 21A, which also serves as a support for the main bus bar group. It also serves as a pillar to support the busbar group. Disconnector units, that is, central disconnectors 6A, 6B, 6C, and bus-side disconnectors 5A, 7 connected in series on both sides thereof.
A, 5B, 7B, 5C, and 7C are arranged in a U-shape on one side of the main bus group on a plane for each phase, and the bus-side disconnectors 5A, 7A
The side that is not connected to the central disconnector 6A is
Main bus bar 20 via branch bus bars 22A and 23A
Connected to A and 21A. In addition, two external drawer units, for example, a power transmission line drawer unit and a transformer side drawer unit, connect their respective drawer connection parts, that is, the power line drawer connection part 11A and the transformer side drawer connection part 14A, to the disconnector unit. Connect to the bottom side of the shape, that is, between the two bus-side disconnectors 5A, 7A and the central disconnector 6A, for example, connect the power transmission line draw-out connection part 11A to the opposite branch bus 22A connection side of the bus-side disconnector 5A. To,
In addition, the transformer side drawer connection part 14A is connected to the opposite branch busbar 23A connection side of the busbar side disconnector 7A, respectively.
The power transmission line lead-out unit and the transformer side lead-out unit, that is, the external lead-out unit, are connected and arranged alternately in the same direction. The configuration other than the above is the same as that of the conventional device, and the B and C phases other than the A phase also have the same configuration as the A phase described above.

Although the present invention has the above configuration,
The distance between the phases of the transmission line draw-out bushings 10A, 10B, and 10C, which are air draw-out bushings, is determined by the air insulation distance, and has a considerably large dimension, for example, in the case of 500 KV, the phase-to-phase distance is usually 8 m. Therefore, even though the distance B between the power transmission line pull-out bushings 10A and 10C on both sides is the same length as the conventional device,
Other external draw-out units, such as transformer-side draw-out units, are placed between their respective phases, and the configuration is such that the space between each transmission line draw-out unit is effectively utilized, resulting in a slightly increased length of D. In addition, the distance L between both ends of the external drawer units of the conventional device can be accommodated within Main bus bar 20 reduced by approximately half by stacking the top and bottom three levels
A, 20B, 20C and power line pullout bushing 1
The distance between 0A, 10B, 10C is L',
The present invention has the effect of significantly reducing the installation footprint of the device, and also has the advantage that each branch bus bar 22A, 22B, 22C, 23A, 23B, 23
Since the main bus bar group is supported by C, the pedestal 15 is not required, which has the effect of significantly reducing manufacturing and installation costs.

In addition, the disconnectors 5A to 5C, 6 of the disconnector unit
Although horizontal disconnectors were used for A to 6C and 7A to 7C in the above embodiments, the present invention is not limited to this, and vertical disconnectors may be used without any problem.

[Brief explanation of the drawing]

Figures 1 and 2 are single line diagrams of the conventional and present invention 1 1/2 disconnector type double busbars, Figure 3 is a plan layout diagram of a conventional gas insulated switchgear, and Figure 4 is a diagram of the conventional gas insulated switchgear. FIG. 5 is a plan layout of the gas insulated switchgear according to an embodiment of the present invention, and FIG. 7 is a front view thereof. , FIG. 8 is a plan layout diagram excluding the main busbar, and FIG. 9 is a detailed explanatory diagram of each main busbar branch connection part. A, B, C...A phase, B phase, C phase, 1, 2, 2
0, 21... Main bus bar, 3, 4, 22, 23... Branch bus bar, 5, 7... Bus bar side disconnector, 6... Central disconnect switch, 8... Power line drawer disconnector, 9 ...Power line side disconnector, 10...Power line drawer bushing, 11...Power line drawer connection part, 12...Transformer side disconnector, 13...Cable head, 14...
...Transformer side drawer connection part, 15... Frame. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A double bus bar consisting of two sets of gas-insulated main bus bars, and a bus-side disconnect on both sides connected between the two sets of main bus bars of the same phase and electrically connected in series. A disconnector unit consisting of three disconnectors, a disconnector and a central disconnector located between them, a disconnector electrically connected to one between the busbar side disconnector and the central disconnector, External lead-out units such as transmission line lead-out units consisting of equipment, etc., and transformer-side lead-out units that similarly consist of cables, disconnectors, etc. electrically connected between other bus-side disconnect switches and the central disconnect switch. Consisting of other external drawer units such as
In a gas insulated switchgear such as the so-called 1 1/2 disconnector system, the three disconnectors of the disconnector unit are shaped like a U on a plane, with the upper and lower sides serving as the busbar side disconnectors, and the middle side serving as the center disconnector. The main busbars of the two sets are arranged together on the open side of the U-shape, and the branch busbars branched from the main busbar of the same phase of each set are connected to the open side of the bus-side disconnect switch. A gas insulated switchgear characterized in that sets of external drawer units are alternately connected to the U-shaped closed side of a disconnector unit. 2. The gas insulated switchgear according to claim 1, wherein the two sets of main busbars are stacked in three levels, one above the other. 3. The gas insulated switchgear according to claim 1, wherein each of the branch busbars also serves as a support for supporting the main busbar.