JPH079529Y2 - Kyuburu type gas insulated switchgear - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention is a cubicle-type gas-insulated switchgear that can easily add a transformer disconnector and a transformer protection breaker when a bank is added to a substation. Pertain.

“Conventional Technology” In recent years, it has become difficult to secure a substation site in spite of an increase in power demand in the central part of the city and its surrounding areas. One way to solve this problem is to use a so-called cubicle type gas insulated switchgear in which equipment such as a circuit breaker or a disconnector is packaged in a sealed container filled with an insulating medium such as SF ₆ gas. The substation is significantly smaller than the insulated type.

On the other hand, when constructing a substation, only the required number of banks was initially set because the cubicle type gas-insulated switchgear was relatively expensive and the upfront investment in substation construction was reduced. After installation, banks are being added one after another according to the power demand.

Fig. 3 is a skeleton diagram showing the achievement of two lines and one bank. Line 1L and line 2L have power receiving disconnecting switches 1 and 1a, respectively.
The power receiving circuit breakers 2 and 2a and the busbar disconnecting switches 3 and 3a are connected. In addition, 4 is a line disconnecting switch for mother communication and 5 is a transformer.

Further, FIG. 4 shows an example of the prior art device configuration for one line of FIG. 3, that is, the one-dot chain line portion in FIG. In a closed container 7 filled with an insulating medium 6 such as SF ₆ gas, a power receiving disconnector 1, a power receiving circuit breaker 2, a busbar disconnecting device 3 and a mother interconnecting disconnecting device 4 are connected and housed respectively. , A cubicle type gas insulated switchgear is constructed. In addition, 8 and 8a are cable heads.

The transformer 5 and the hermetically sealed container 7 are hermetically connected by a transformer connecting portion 9, and the transformer 5 is electrically connected by a bus bar 10 between the bus bar disconnector 3 and the bus line disconnector 4. There is.

In the above two-line / one-bank configuration, when one bank is to be added, as shown by the broken line in the skeleton diagram of FIG. 5, the busbar disconnector 3a is connected to the transformer disconnector 11a, the transformer protection breaker 12a, And a transformer 5a are connected and added, while a transformer disconnector is provided between the busbar disconnector 3 and the transformer 5.
11 and a transformer protection circuit breaker 12 may be added. In this case, transformer disconnector 11a, transformer protection circuit breaker 12a,
Since the transformer 5a and the transformer 5a may be simply connected to the existing busbar disconnector 3a, the work is easy.

On the other hand, the transformer disconnector 11 and the transformer protection circuit breaker 12
Is required to be added between the existing busbar disconnecting switch 3 and the transformer 5, so the work is not easy. That is,
In the extension work, the power line is removed by the cable heads 8 and 8a in FIG.
It is disconnected from the transformer 5 by removing it. After that, the transformer disconnector 11 and the transformer protection breaker 12 are housed in the closed container 7, and the busbar disconnector 3 and the mother-interconnect disconnector 4 are housed.
Connect in between. Further, the hermetically sealed container 7 is hermetically connected to the transformer 5 again by the transformer connecting portion 9. FIG. 6 shows a state in which the transformer disconnecting switch 11 and the transformer protection circuit breaker 12 are added as described above, that is, the device configuration of the one-dot chain line in FIG.

[Problems to be Solved by the Invention] In the above-mentioned conventional technique, it is necessary to attach and detach the transformer connecting portion 9. That is, the transformer connection portion 9 that connects between the existing transformer 5 and the cubicle-type gas insulated switchgear that are operating without any trouble is to be detached in the field work, and the existing transformer 5 and the cubicle type There is a drawback that the reliability of the gas insulated switchgear is lowered.

Further, the work of attaching and detaching the power line is required via the cable heads 8 and 8a, and there is a drawback that the time for the additional construction increases.

[Means for Solving the Problems] The present invention is intended to solve the above-mentioned drawbacks of the prior art. In the main body container of the gas-insulated switchgear, a power receiving disconnector, a power receiving breaker, and a busbar disconnecting switch are provided. And a device such as a disconnecting switch for mother connection are connected, and a transformer is connected to one surface of the main body container via a transformer connecting portion, and one of the surfaces adjacent to the surface of the main body container to which the transformer is connected. An adapter container containing an insulating medium is hermetically connected via two first and second connecting parts, and a busbar connected to the transformer is connected to the transformer connecting part, the main body container, and the first connecting part. It is configured to be connected to the device in the main body container via the part, the adapter container, and the second connection part.

[Operation] With the configuration described above, when adding a transformer disconnector and a transformer protection circuit breaker at the time of adding one bank, by removing the adapter container at the first connecting portion and the second connecting portion, the main body is removed. Separate from the container. Then, the separately prepared additional container containing the transformer disconnecting switch and the transformer protection circuit breaker may be hermetically connected to the main body container again at the first connecting portion and the second connecting portion.

Therefore, it is not necessary to detach the transformer and the main body container, and it is not necessary to remove the power line. As a result, not only the reliability of the existing transformer and the cubicle-type gas-insulated switchgear does not deteriorate, but also the time required for the extension work can be shortened as compared with the conventional technique.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. It should be noted that the same parts as those in the above-mentioned conventional technique are denoted by the same reference numerals, and duplicate description will be omitted.

FIG. 1 shows the equipment configuration of an embodiment of the present invention before the addition, that is, the one-dot chain line portion in FIG. 3, in which the main body container 21 filled with the insulating medium 6 has a power receiving disconnecting switch 1 and a power receiving switch. A circuit breaker 2, a busbar disconnecting switch 3, and a busbar disconnecting switch 4 are housed. The transformer 5 and the main body container 21 are hermetically connected by a transformer connecting portion 9 provided on one surface 21 a of the main body container 21. Further, on one adjacent surface 21b of the one surface 21a to which the transformer 5 of the main body container 21 is connected, two first connecting portions 22 and two second connecting portions 23 are arranged. The adapter container 24 filled with the insulating medium 6 is hermetically connected by the portion 22 and the second connecting portion 23. Further, the bus bar 25 connected to the transformer 5 includes the transformer connecting portion 9, the main body container 21, the first connecting portion 22, the adapter container 24, and the second connecting portion.
It is connected between the busbar disconnector 3 and the mother interconnector disconnector 4 via the connecting portion 23 and the inside of the main body container 21.

Next, when adding the transformer disconnecting switch 11 and the transformer protecting circuit breaker 12 when adding one bank, remove the first connecting portion 22 and the second connecting portion 23 in FIG. 1 to remove the adapter container.
Separate 24 from the body container 21. Thereafter, as shown in FIG. 2, an additional container 24a containing a separately prepared transformer disconnecting switch 11 and transformer protecting circuit breaker 12 is sealed in the main body container 21 by the first connecting portion 22 and the second connecting portion 23. Connecting. As a result, the transformer disconnector 11 and the transformer protection circuit breaker 12 are added, and the device configuration of the one-dot chain line in FIG. 5 is realized.

[Advantage of Invention] As described above in detail with the embodiments, according to the present invention,
The transformer disconnector and transformer protection circuit breaker, which must be installed between the existing transformer and the busbar disconnector when adding one bank, can be added without disconnecting the transformer connection. Therefore, the reliability of the existing transformer and the cubicle type gas-insulated switchgear which are operated without any trouble will not be reduced.

Further, since it is not necessary to attach and detach the power line by the cable heads 8 and 8a, it is possible to shorten the time for the extension work.

[Brief description of drawings]

FIG. 1 is a device configuration diagram before expansion, which is an embodiment of the present invention,
Fig. 2 is a device configuration diagram after expansion, Fig. 3 is a skeleton diagram of a two-line / one-bank configuration, Fig. 4 is a device configuration diagram in the prior art of the one-dot chain line in Fig. 3, and Fig. 5 is one bank extension. A later skeleton diagram and FIG. 6 are device configuration diagrams in the prior art of the one-dot chain line portion of FIG. In the figure, 1 is a power receiving disconnector, 2 is a power receiving circuit breaker, 3 is a busbar disconnecting switch, 4 is a busbar disconnecting switch, 5 is a transformer, 6 is an insulating medium 9, 9 is a transformer connection part, and 21 is a main container 22. Is a first connection part, 23 is a second connection part 24 is an adapter container, and 25 is a bus bar.

Claims (1)

[Scope of utility model registration request] 1. A device such as a power receiving disconnector, a power receiving circuit breaker, a busbar disconnecting switch, and a mother disconnecting disconnector is housed in a main body container of a gas-insulated switchgear, and a transformer is connected to one surface of the main body container. Adapter container in which an insulating medium is accommodated through a first part and a second connecting part at two places on one side of the surface of the main body container adjacent to the transformer side And the busbar connected to the transformer is connected to the device in the main body container via the transformer connection part, the main body container, the first connection part, the adapter container, and the second connection part. A cubicle type gas insulated switchgear featuring.