JPH0898343A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: To extend apparatus in series to an already installed gas insulated switchgear with a short time work and a short time service interruption without changing an existing layout. CONSTITUTION: A breaker 3a, a disconnector 2c, a cable head 11a, an attaching/ detaching device 12, a cable head 11b, a breaker 3b and a disconnector 2d are arranged linearly in this order from two main bus-bars 1a and 1b through individual bus-bar disconnectors 2a and 2b in a direction perpendicular to the main bus-bars 1a and 1b. A bushing 5 is provided at a position apart a little from the disconnector 2d on the side opposite to the breaker 3b side in a direction perpendicular to the direction of the apparatus train and is connected to the disconnector 2d. As an extension part, cables 13a and 13b are connected to the cable heads 11a and 11b and a reactor 4 is connected between the cables 13a and 13b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear installed in a power substation, and in particular, has a structure suitable for the case where a series reactor such as a series reactor is added after the power substation is installed. The present invention relates to a gas insulated switchgear.

[0002]

2. Description of the Related Art At present, a gas-insulated switchgear is widely used as a switchgear installed in a power substation. This gas-insulated switchgear is a switchgear configured by connecting a plurality of gas-insulated devices each having a device body such as a switch and a charging unit housed in a container filled with insulating gas. The gas-insulated switchgear having such a configuration has advantages such as high insulation reliability, miniaturization, and excellent safety, and thus further development thereof is desired.

On the other hand, as the demand for electric power has increased in recent years, the capacity of power transmission systems has been increasing. Therefore, from the perspective of future capacity of the system, in order to reduce the short-circuit current, install an overdesigned product considering the future from the beginning of the installation of the gas insulated switchgear, or install a series reactor in the gas insulated switchgear. It has become necessary to reduce the short-circuit current with this reactor.

FIG. 7 is a single wire connection diagram showing an example of a line circuit of the gas insulated switchgear in which the series reactor is incorporated as described above. As shown in FIG. 7, two main buses 1
To a and 1b, one end of a circuit breaker 3a is connected via individual bus bar disconnectors 2a and 2b.
One end of the reactor 4 is connected to the other end of the reactor via a disconnector 2c. Further, a bushing 5 is connected to the other end of the reactor 4 via a circuit breaker 3b and a disconnector 2d.

FIG. 8 is a plan view showing an example of a concrete device configuration of the gas-insulated switchgear of FIG. 7, (A) showing a configuration after adding a series reactor, and (B) showing a configuration before adding a series reactor. Are shown respectively. First, after the serial reactor is added, as shown in FIG. 8A, from the two main buses 1a and 1b to the individual disconnecting switches 2a and 2b for the buses.
Through, in the direction orthogonal to the main buses 1a, 1b,
The circuit breaker 3a, the reactor 4, the circuit breaker 3b, and the disconnector 2d are linearly arranged in this order and connected to each other. On the opposite side of the disconnector 2d from the circuit breaker 3b, a bushing 5 is arranged so as to project in the orthogonal direction from this device row, and is connected to the disconnector 2d.

[0006] Further, before adding the series reactor,
As shown in FIG. 8B, the circuit breaker 3a and the disconnector 2c are linearly arranged from the two main buses 1a and 1b through the individual busbar disconnectors 2a and 2b. It is connected. A bushing 5 is arranged on the side of the disconnector 2c opposite to the circuit breaker 3a so as to project in the orthogonal direction from the device row, and is connected to the disconnector 2c.

[0007]

However, as described above, the incorporation of series equipment such as a series reactor into the existing gas-insulated switchgear in a single order is performed by comparing (A) and (B) of FIG. As is obvious, there is a problem in practical use because a large layout change is required, a long working time and a huge cost are required. In addition, requiring a long working time to add a gas-insulated switchgear like this leads to a long power outage at the power substation,
It becomes difficult to satisfy the demand for stable power supply required for the power transmission system.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
It is an object of the present invention to provide a gas-insulated switchgear capable of performing expansion work in a short work / blackout time without having to change the existing layout when adding a series device to a gas-insulated switchgear after installation.

More specifically, an object of the present invention is to easily add a series device through a cable in a short power failure time without changing the existing layout. It is an object of the invention of claim 2 to easily add a series device through a gas insulated busbar in a short work / blackout time without changing an existing layout. It is an object of the invention of claim 3 to further shorten the work / power failure time of the addition by mechanically removing the branch connection portions and further facilitate the addition work. The object of the invention according to claim 4 is to
The purpose of this is to shorten the time for additional work and power failure as much as possible by electrically opening the branch connection, and to make the additional work as easy as possible.

[0010]

A gas-insulated switchgear according to the present invention is constructed by connecting a plurality of gas-insulated devices each having a device main body housed in a container filled with insulating gas.
The gas-insulated switchgear installed in the power substation is characterized by having an additional branch connection. That is, the invention according to claim 1 is characterized in that a pair of branch connection portions to which a cable for serial device connection, which is added after installation, can be connected, is provided. Further, the invention according to claim 2 is characterized in that a pair of branch connection parts capable of connecting the gas-insulated bus bar for connecting serial devices, which is added after installation, is provided. On the other hand, the invention according to claim 3 is characterized in that an attaching / detaching device is provided between the pair of branch connecting portions. Further, the invention according to claim 4 is characterized in that a disconnector is provided between the pair of branch connection portions.

[0011]

According to the present invention having the above structure, the following effects can be obtained. That is, according to the invention of claim 1, by connecting a cable to each of the pair of branch connection portions, it is possible to easily connect the series devices in series via the cables. Further, according to the invention of claim 2, by connecting the gas-insulated bus bar to each of the pair of branch connection parts, it is possible to easily connect the series devices in series via the gas-insulated bus bar. Therefore, according to the first and second aspects of the present invention, it is possible to easily add the series equipment in a short working time without changing the existing layout of the gas insulated switchgear. As a result, the power outage time can be significantly shortened as compared with the case where the existing layout is changed.

On the other hand, according to the third aspect of the present invention, a cable or a gas-insulated busbar is connected to each of the pair of branch connecting portions, and the attaching / detaching device provided between the branch connecting portions is removed to remove the space between the branch connecting portions. Can be easily and quickly separated to complete the expansion work. Therefore, it is possible to shorten the work time of the extension work, shorten the power failure time, and facilitate the extension work.

Further, according to the invention of claim 4, a cable or a gas-insulated busbar is connected to each of the pair of branch connection parts, and a disconnector provided between the branch connection parts is opened to thereby make a branch connection. It is possible to easily and quickly separate the parts and complete the expansion work. In this case, the disconnecting switch can be opened more quickly than the detachment device can be removed, so the work time for the additional work can be further shortened, the power outage time can be further shortened, and the additional work can be further facilitated. You can

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the gas insulated switchgear according to the present invention will be specifically described below with reference to FIGS.

[1] First Embodiment FIG. 1 to FIG. 3 FIG. 1 is a plan view showing a gas-insulated switchgear according to the first embodiment of the present invention. 1 is a side view and FIG. 3 is a single line connection diagram corresponding to FIG.
As shown in FIG. 1, from the two main buses 1a and 1b,
The main busbar 1a, via the individual busbar disconnectors 2a, 2b,
A circuit breaker 3a and a disconnector 2 are provided in a direction orthogonal to 1b.
c, the cable head 11a, the attachment / detachment device 12, the cable head 11b, the circuit breaker 3b, and the disconnector 2d are arranged linearly in this order. In this case, the cable head 1
1a and 11b correspond to the branch connection portion of the present invention. Also,
On the opposite side of the disconnector 2d from the circuit breaker 3b, a bushing 5 is arranged at a position slightly away from the device row in the orthogonal direction, and is connected to the disconnector 2d. The above configuration
This is the initial configuration of the gas-insulated switchgear before the addition of the series reactor.

That is, FIG. 1 shows the structure after adding a series reactor to the gas-insulated switchgear at the beginning of such installation.
The cables 13a and 13b are connected to a and 11b, and the reactor 4 is provided between the cables 13a and 13b.
Are connected. In this case, the reactor 4 is arranged at a position slightly away from the device row of the line circuit in the orthogonal direction on the side opposite to the bushing 5. The cables 13a and 13b are connected to the cable heads 11a and 11b, respectively.
, Are arranged in the orthogonal direction. The distance between the pair of cable heads 11a and 11b is shortened from the viewpoint of reducing the length of the entire line.
Along with this, the one cable 13b is arranged so as to slightly detour around the reactor 4. In addition, in reality, the detachment device 3 is removed from this state, whereby the extension work is completed.

According to the present embodiment having the above-mentioned structure, by connecting the cables 13a and 13b to the pair of cable heads 11a and 11b, respectively, the reactor 4 can be easily connected via the cables 13a and 13b. Can be connected in series. Then, from this state, the attachment / detachment device 1 provided between the pair of cable heads 11a and 11b
By simply disconnecting 2, the cable heads 11a and 11b can be easily and quickly separated from each other, and the work of adding the serial reactor can be completed.

Therefore, according to this embodiment, the series reactor can be easily added in a short working time without changing the existing layout of the gas insulated switchgear. As a result, the power outage time can be significantly shortened as compared with the conventional technique of FIG. 8 in which the existing layout needs to be changed.
Further, since the attachment / detachment device 12 is used, it is possible to further shorten the work time of the additional work, further shorten the power failure time, and further facilitate the additional work.

[2] Second Embodiment ... FIG. 4 FIG. 4 is a plan view showing a gas-insulated switchgear according to a second embodiment of the present invention. This Figure 4
As shown in FIG. 7, in the present embodiment, instead of the cable heads 11a and 11b of the first embodiment, gas-insulated busbars having lead-out branch portions on the side surfaces are used as the branch busbars 14a and 14b as the branch connection portions. ing. Except for the branch buses 14a and 14b, the initial configuration of the gas-insulated switchgear according to the present embodiment before the addition of the series reactor is exactly the same as the initial configuration of the first embodiment described above.

Also, like FIG. 1 of the first embodiment, this FIG. 4 also shows the configuration after the series reactor is added to the gas-insulated switchgear at the time of installation. The connecting buses 15a and 15b, which are gas insulated buses, are connected to 14a and 14b, and the reactor 4 is connected between the connecting buses 15a and 15b. In this case, the reactor 4 is arranged at a position slightly away from the device row of the line circuit in the orthogonal direction on the side opposite to the bushing 5. Then, the connecting buses 15a, 15
b is arranged in a direction orthogonal to the branch buses 14a and 14b. The distance between the pair of branch busbars 14a and 14b is shortened from the viewpoint of shortening the overall length of the line, so that one of the connecting busbars 15b is arranged in such a manner as to slightly detour around the reactor 4. It is set up. In addition, actually, from this state, the attaching / detaching device 3
Is removed, the expansion work is completed.

According to the present embodiment having the above-mentioned structure, the connecting busbars 15a and 15b are connected to the pair of branch busbars 14a and 14b, respectively, so that the reactor 4 is connected via the connecting busbars 15a and 15b. Can be easily connected in series. From this state, the branch busbars 14a and 14b can be easily and quickly separated by simply removing the attaching / detaching device 12 provided between the pair of branch busbars 14a and 14b, and the work of adding the serial reactor can be completed.

Therefore, according to this embodiment, as in the first embodiment, it is possible to easily add a series reactor in a short working time without changing the existing layout of the gas insulated switchgear, and as a result, The power outage time can be significantly shortened as compared with the conventional technique of FIG. Further, as in the first embodiment, since the attachment / detachment device 12 is used, the work time of the additional work is further shortened, the power failure time is further shortened, and
The expansion work can be made easier.

[3] Third Embodiment ... FIG. 5 FIG. 5 is a plan view showing a gas insulated switchgear according to a third embodiment of the present invention. This Figure 5
As shown in, the present embodiment is a modification in which the disconnecting device 2e is used instead of the attaching / detaching device 12 in the gas insulated switchgear (FIG. 1) of the first embodiment. Except for this disconnector 2e, the structure is exactly the same as that of the first embodiment.

According to the present embodiment having the above-mentioned structure, the pair of cable heads 11 are provided as in the first embodiment.
By connecting the cables 13a and 13b to a and 11b, respectively, the reactor 4 can be easily connected in series via the cables 13a and 13b. Then, from this state, the pair of cable heads 11a, 11a
By disconnecting the disconnecting switch 2e provided between b, the cable heads 11a and 11b can be easily and quickly disconnected,
It is possible to complete the expansion work of the series reactor.

Therefore, according to this embodiment, as in the first embodiment, it is possible to easily add a series reactor in a short working time without changing the existing layout of the gas-insulated switchgear, and as a result, The power outage time can be significantly shortened as compared with the conventional technique of FIG. Further, in the present embodiment, since the pair of cable heads 11a and 11b is configured to be opened by the disconnector 2e, compared to the first embodiment configured to remove the attachment / detachment device 12,
The disconnection between the cable heads 11a and 11b can be performed more quickly. Therefore, compared to the first embodiment,
It is possible to further shorten the work time of the extension work and further shorten the power failure time, and further facilitate the extension work.

[4] Fourth Embodiment ... FIG. 6 FIG. 6 is a plan view showing a gas-insulated switchgear according to a fourth embodiment of the present invention. This Figure 6
As shown in FIG. 7, this embodiment is a modification in which the disconnecting device 12 in the gas insulated switchgear (FIG. 4) of the second embodiment is replaced with the disconnector 2e. Except for this disconnector 2e, the structure is exactly the same as that of the second embodiment.

According to this embodiment having the above-mentioned structure, as in the second embodiment, the pair of branch busbars 14a, 14a is formed.
By connecting the connecting buses 15a and 15b to each of b, the reactor 4 can be easily connected in series via the connecting buses 15a and 15b. Then, from this state, the branch busbars 14a, 14b are opened by opening the disconnector 2e provided between the pair of branch busbars 14a, 14b.
It is possible to easily and quickly disconnect the b and complete the work of adding the series reactor.

Therefore, according to this embodiment, similarly to the second embodiment, it is possible to easily add a series reactor in a short working time without changing the existing layout of the gas insulated switchgear, and as a result, The power outage time can be significantly shortened as compared with the conventional technique of FIG. Further, in the present embodiment, the disconnector 2e is provided between the pair of branch buses 14a and 14b.
Since it is configured to open at
The branch busbars 14a and 14b can be more quickly separated from each other as compared with the second embodiment configured to remove. Therefore, as compared with the second embodiment, it is possible to further shorten the work time of the extension work and further shorten the power outage time, and it is possible to further facilitate the extension work.

[5] Other Embodiments The present invention is not limited to the above-described embodiments, and various other modified examples can be implemented. For example, in each of the above-mentioned embodiments, the case where the main bus is the double bus system is shown, but the present invention is similarly applicable to the case where the main bus is a single bus, and the same excellent action is obtained. And the effect can be obtained. Further, the specific device configuration and layout of the gas-insulated switchgear at the time of installation, and the specific configuration and layout of the serial device extension part can be changed as appropriate.

[0030]

As described above, according to the present invention,
By installing a branch connection part in the gas-insulated switchgear in advance, when adding series equipment to the gas-insulated switchgear after installation, it is possible to carry out short work without changing the existing layout.
It is possible to provide a gas-insulated switchgear capable of performing additional work during a power outage.

[Brief description of drawings]

FIG. 1 is a plan view showing a gas insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a single line connection diagram corresponding to FIG.

FIG. 4 is a plan view showing a gas insulated switchgear according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a gas insulated switchgear according to a third embodiment of the present invention.

FIG. 6 is a plan view showing a gas insulated switchgear according to a fourth embodiment of the present invention.

FIG. 7 is a single wire connection diagram showing an example of a conventional gas insulated switchgear.

8A and 8B are plan views showing an example of the specific device configuration of FIG. 7, where FIG. 8A is a configuration after a series reactor is added, and FIG. 8B is a configuration before a series reactor is added.

[Explanation of symbols]

 1a, 1b ... Main bus 2a, 2b, 2c, 2d, 2e ... Disconnector 3a, 3b ... Circuit breaker 4 ... Reactor 5 ... Bushing 11a, 11b ... Cable head 12 ... Attachment / detachment device 13a, 13b ... Cable 14a, 14b ... Branch Bus bar 15a, 15b ... Connection bus bar

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 14, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG.

Claims (4)

[Claims] 1. A gas-insulated switchgear installed at a power plant substation, which is constructed by connecting a plurality of gas-insulated devices each having a device main body housed in a container filled with insulating gas and installed after installation. A gas-insulated switchgear comprising a pair of branch connection parts to which a cable for connecting a serial device can be connected. 2. A gas-insulated switchgear installed at a power plant substation, which is constructed by connecting a plurality of gas-insulated devices in which a device body is housed in a container filled with insulating gas, and is expanded after installation. A gas-insulated switchgear comprising a pair of branch connection parts to which a gas-insulated bus bar for connecting serial devices can be connected. 3. The gas-insulated switchgear according to claim 1, further comprising an attachment / detachment device provided between the pair of branch connection portions. 4. The gas insulated switchgear according to claim 1, wherein a disconnector is provided between the pair of branch connection portions.