JPH0210722Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a gas insulated switchgear.
In particular, in a gas insulated switchgear to which a so-called double busbar-shiya disconnection system is applied, the arrangement of the gas insulated busbar and the busbar switching disconnector is improved.

[Technical background of the invention] With the increase in the capacity of power transmission and transformation equipment, gas-insulated switchgears that use insulating gas such as SF ₆ gas, which has excellent insulation properties, have recently been widely adopted. At the same time, in order to stabilize the power transmission system, these power transmission substations employ a so-called double bus system in which there are two busbars. In order to lead out the power transmission system from such a double busbar to an overhead power transmission line, a gas insulated switchgear using an appropriate number of disconnectors or disconnectors according to the capacity is used.

One example is a gas-insulated switchgear of the double busbar-shutoff type having a configuration as shown in the single-line diagram of FIG. That is, this type of gas insulated switchgear connects the busbars 1a and 1b of the two systems to the busbar switching disconnectors 3a and 3b via the connection buses 2a and 2b, respectively.
3b is connected, and these bus bar switching disconnectors 3a, 3
b is connected to the bow breaker 5 via the intermediate connection bus 4. A bushing 7 that is connected to an overhead power transmission line is connected to the sheath disconnector 5 via a disconnector 6. Further, a bushing 8 connected to the air-insulated bus bar is connected to the bus bar switching disconnector 3a connected to one of the bus bars 1a.

In such a gas insulated switchgear of double busbar one-disconnection type, the specific installation of the busbar switching disconnector and other devices has conventionally been carried out as shown in Figs. 2 to 4. configuration has been adopted. That is, three-phase bus bars 1a and 1b are used as the bus bars 1a and 1b, and three single-phase bus switching disconnectors 3a and 3b are placed at separate positions on the sides of the three-phase bus bars 1a and 1b, respectively. These busbar switching disconnectors 3
a, 3b and three-phase busbars 1a, 1b are connected by connecting busbars 2a, 2b bent in an L-shape.

[Problems with background technology] However, in such a conventional gas insulated switchgear, the busbar switching disconnectors 3a and 3b are connected to the three-phase busbar 1.
Because it is placed on the side of a and 1b and away from the generatrix,
The disadvantage of the gas insulated switchgear as a whole is that it requires a large amount of space. In addition, in order to connect the busbar switching and disconnecting switches 3a, 3b of each phase to the three-phase busbars 1a, 1b, a long connection busbar consisting of two members, a horizontal part and a vertical part, is required, and the gas insulation is increased accordingly. The number of components of the switchgear has increased, the structure has become more complex, and the number of gas divisions has increased, resulting in inconveniences in manufacturing and maintenance.

[Purpose of the invention] This invention was proposed to solve the above-mentioned drawbacks of the conventional type.The purpose is to reduce the overall installation space, and to connect each device with a short connection busbar. The objective is to provide a gas insulated switchgear that can be connected to

[Summary of the invention] The gas-insulated switchgear of the present invention eliminates the need for a dedicated space for the bus switching disconnector by integrally arranging the bus switching disconnector for each three-phase bus above the three-phase bus. Furthermore, the length of the connecting bus can be shortened by placing the three-phase bus and the bus switching disconnector close to each other.

[Embodiment of the invention] Next, an embodiment of the invention will be explained in detail with reference to FIGS. 5 to 7. Note that the same members as those of the conventional type are designated by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, busbar switching and disconnecting switches 3a and 3b for each phase are arranged in parallel at predetermined intervals in the busbar axis direction above each of the three-phase busbars 1a and 1b constituting the double busbar. These busbar switching disconnectors 3a, 3b
and the three-phase buses 1a, 1b are connected via connection buses 2a, 2b, respectively. The connection buses 2a, 2b extend perpendicularly from the tops of the three-phase buses 1a, 1b to the bus switching disconnectors 3a, 3b. On the other hand, the three-phase buses 1a and 1b are connected to the second
They are arranged closer to each other than the conventional example shown in the figure. That is, in this embodiment, since the busbar switching and disconnecting switches 3a and 3b are arranged above the three-phase buses 1a and 1b, the busbar switching and disconnecting switches 3a and 3b are provided on the sides of each of the three-phase buses 1a and 1b. Since there is no need for dedicated space for the three-phase bus 1a,
1b are arranged close to each other. Therefore, the bus switching disconnectors 3a, 3b for each three-phase bus 1a, 1b
Regarding the intermediate connecting bus 4 that connects the two,
It is shorter than the conventional type. Furthermore, regarding the bus switch disconnector 5 connected to these bus switch disconnectors 3a and 3b via the intermediate connection bus 4, the 3-phase switch 3b is not located on the side of the 3-phase bus 1b. It is located close to the busbar. And the busbar switching disconnectors 3a and 3b are 3
They are connected via connection buses 2a, 2b without being directly connected to phase buses 1a, 1b. Therefore, dust such as metal particles generated when the busbar switching disconnectors 3a and 3b are opened and closed is collected at the bottom of the container which is grounded to zero potential, so the dielectric strength does not decrease due to dust generation and the reliability of the insulation is improved. is guaranteed.

In this embodiment, the bus switching disconnector 3a provided on the three-phase bus of one system has a bushing 8 connected to the air-insulated bus bar integrally and in a straight line with the disconnector 3a. Therefore, the installation space for the air bus connection bushing 8 can be reduced.

[Effects of the invention] As described above, according to the invention, there is no need for a dedicated space for the busbar switching disconnector, and it is possible to arrange the palms and disconnectors of the three-phase busbars in close proximity to each other. The site area of the entire insulated switchgear is reduced, and the length of the connection bus bar connecting each of these devices is shortened, making it possible to achieve miniaturization and simplification of the entire device. In addition, in areas with heavy snowfall, it is necessary to support the disconnector palm or disconnector with a pedestal or the like and install it in a high position in consideration of snow accumulation, but according to the present invention, the busbar switching disconnector This is extremely advantageous in terms of snow resistance, since the sheath disconnector and the disconnector on the bushing side connected to it are also located at a high position. Furthermore, since the bus switching disconnector and the three-phase bus are connected by the connecting bus, the dielectric strength of the bus switching disconnector can be maintained at a good level.

[Brief explanation of the drawing]

Figure 1 is a single-line diagram of a gas-insulated switchgear with a double bus-shuttle breaker system, Figure 2 is a plan view of a conventional gas-insulated switchgear, Figure 3 is a side view of the same as above, and Figure 4 is the same as above. FIG. 5 is a plan view of a gas insulated switchgear showing an embodiment of the present invention, FIG. 6 is a side view of the same, and FIG. 7 is a front view of the same. 1a, 1b... 3-phase bus, 2a, 2b... connection bus, 3a, 3b... bus switching disconnector, 4... intermediate connection bus, 5... bow breaker, 6... disconnector, 7,
8... Butsing.

Claims (1)

[Claims for Utility Model Registration] (1) Busbar switching disconnectors for each phase are installed in parallel and spaced apart in the bus axis direction on the top of two three-phase busbars extending in parallel, and the busbar switching disconnectors and three The phase bus is connected to the three-phase bus by a connection bus that extends vertically from the top of the three-phase bus, and the bus switching disconnect switch for each three-phase bus is connected to the bottom switch via an intermediate connection bus that extends orthogonally to the three-phase bus. Gas insulated switchgear characterized in that they are connected to each other. (2) The scope of the utility model registration claim described in paragraph 1, wherein at least one of the busbar switching disconnectors provided above the three-phase busbar of each system is provided with a bushing that connects to the air-insulated busbar. Gas insulated switchgear.