JPH10112907A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear that reduces installation space for the entire equipment by downsizing a construction section for circuit disconnection, adjacent to disconnectors for bus sectioning. SOLUTION: A tank 2 houses the horizontal portion of a main circuit conductor 10 that connects a first disconnectors and a second disconnector DS21, 22 for bus sectioning with a first circuit and a second circuit, the horizontal portion of a connecting bus BS1 that connects the first and seocnd disconnectors DS21, 22 for bus sectioning with transformer bank connecting equipment 13; and the horizontal portion of a PT connecting bus BS2 that connects the first and second disconnectors DS21, 22 for bus sectioning with an instrument transformer PT. A manhole is formed on the side of horizontally arranged main trucks 2a, 2b of the tank 2, and attachable/detachable conductors 6a, 6b that can be attached and detached by means of bolts 5a, 5b are placed on the horizontal portions of the main circuit conductor 10, the connecting bus BS1 and the PT connecting bus BS2, corresponding to the manhole.

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 in which a connection between internal components and a tank containing the same are improved.

[0002]

2. Description of the Related Art A gas insulated switchgear is a device in which a switchgear is housed in a grounded metal tank and is filled with an insulating gas. Therefore, there is an advantage that the required space can be reduced, and it is widely used as substation equipment.

An example of a conventional gas-insulated switchgear will be described below with reference to a single-line diagram shown in FIG. This conventional example is disclosed in Japanese Patent Publication No. 6-67.
No. 064, which is a known gas insulated switchgear having a single bus configuration, in which two lines are connected to a bus through a circuit breaker, and a transformer bank and a transformer for an instrument are connected to the bus. That is, the first and second lines L1, L
2 is connected to the connection bus BS1 via the first and second circuit breakers CB1 and CB2, respectively. The transformer bus T1 and the instrument transformer PT are connected to the connection bus BS1. In the middle of the connection bus BS1, the first and second bus section disconnectors are used to separate the transformer bank T1 and the instrument transformer PT from the first and second lines L1 and L2, respectively. DS21 and DS22 are inserted. And the first and second busbar section disconnectors DS2
1, a disconnecting device S is provided between DS22 and the connection bus BS1.
1 and S2 are inserted.

An example of the arrangement of the gas insulated switchgear having such a circuit configuration is as follows. The components and connection buses described below are all housed in a metal tank that is grounded and filled with an insulating gas.
That is, as shown in FIG. 10, the first and second bus segment disconnecting switches DS21 and DS22 are arranged vertically and connected to each other via the connection bus BS1. Transformer bank connection device 13 and first and second bus section disconnectors DS
21 and DS22 are opposed to each other with the connection bus BS1 interposed therebetween. The instrument transformer PT is disposed below the second busbar section disconnecting switch DS22.

[0005] A detachable bus device is inserted between the first and second bus segment disconnecting switches DS21 and DS22 and the connection bus BS1 as disconnecting devices S1 and S2.
As an example of such a detachable busbar device, Japanese Utility Model Application Laid-Open No.
The configuration of a device known in Japanese Patent Publication No. 530 will be described below. That is, flanges 31 are formed at opposite ends of the tanks of the first and second bus-bar section disconnecting switches DS21 and DS22 and the tank of the connection bus BS1, and an insulating spacer 32 is formed on the flanges 31 and 31. , 3
2 are installed. The insulating spacers 32, 32
The spaces are connected by an extendable bellows 33. In the bellows 33, connection conductors 34, 35 extending from the connection bus BS1 are provided, and the detachable detachable conductor 1 is inserted between the connection conductors 34, 35.

In the gas insulated switchgear having the above-described configuration, for example, when a failure occurs in the first bus section disconnecting switch DS21, the first bus section disconnecting switch DS21 is disconnected from the main circuit. , The second line, the transformer bank T1, and the instrument transformer PT. In such a case, as shown in FIG. 11, the bellows 33 are contracted to open the space between the bellows 33 and the insulating spacer 32, and the detachable conductor 1 is removed therefrom to separate the faulty circuit from the main circuit and extend the bellows 33 again. As a result, the space between the insulating spacer 32 is closed and the operation is continued.
When the second bus disconnecting disconnector DS22 fails, the bellows 33 is similarly contracted and the detachable conductor 1 is removed, thereby disconnecting the failed circuit from the main circuit.

[0007]

However, an example of the above-mentioned conventional gas insulated switchgear has the following problems. That is, the disconnector DS2 for the bus section
1, in order to insert the detachable bus device having the above-described configuration between the DS22 and the connection bus BS1, it is necessary to provide the flange 31, the insulating spacer 32, and the like on both sides of the opposite tank end. Sorting disconnector DS21, DS2
The bank line from 2 to the transformer bank T1 becomes longer. Therefore, an increase in the size of the tank leads to an increase in the space of the entire equipment, which impairs the advantage of the gas insulated switchgear that can be reduced in size.

Further, in the gas insulated switchgear having the above configuration, it is difficult to disconnect and remove the connection between individual devices, which is disadvantageous and inconvenient for inspection, repair and replacement. For example, transformer bank T1, connection bus BS
If a failure occurs in any one of the above-mentioned items, it is convenient if the failed device can be removed and inspected and repaired. However, in the above-described conventional example, a structural portion for removing the internal connection conductor is provided at the joint portion of the tank. It was inconvenient without any ingenuity.

Furthermore, when disconnecting both the first and second bus-bar section disconnectors DS21 and DS22 from the transformer bank T1, it is necessary to remove the respective detachable conductors 1 by contracting the respective bellows 33. It takes time and effort. For this reason, two bus-bar separating disconnectors DS21, D
If a failure occurs in S22, it is difficult to respond quickly, which is disadvantageous in terms of ensuring safety.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and the main object of the present invention is to reduce the size of a circuit disconnecting structure adjacent to a bus section disconnecting switch. Accordingly, an object of the present invention is to provide a gas insulated switchgear in which the installation space of the entire facility is reduced.

A second object of the present invention is to provide a gas insulated switchgear capable of easily and quickly removing a faulty device by enabling a conductor portion corresponding to a tank joint to be cut off. It is.

A third object of the present invention is to provide a gas-insulated switchgear which can be quickly disconnected from a main circuit even when there are a plurality of bus-bar section disconnectors and has high safety. Is to do.

[0013]

In order to achieve the above object, a gas insulated switchgear according to claim 1 comprises a bus for connection between a line, a transformer bank and a transformer for an instrument, and the connection bus. A bus section disconnector provided on the bus for use, and a detachable conductor for circuit disconnection provided on a bus for connection between the transformer bank and the transformer for instrument and the disconnector for the bus section, In a gas insulated switchgear housed in a tank filled with an insulating gas, an opening is formed at a position corresponding to the detachable conductor in the tank, the opening having a diameter from which the detachable conductor can be taken out, and which can be closed by a lid. It is characterized by having.

According to the first aspect of the present invention, when the disconnecting device for the bus segment breaks down, the lid of the opening is removed, the detachable conductor inside is removed, and the disconnecting device for the bus segment is removed from the main circuit. Disconnect. Therefore, the faulty part can be separated without providing the detachable bus device.

According to a second aspect of the present invention, there is provided a gas insulated switchgear according to the first aspect, wherein the line is connected to the first line.
And a second line, wherein the bus section disconnector is provided corresponding to the first and second lines, and is a first and second bus section disconnectors that are juxtaposed vertically. The connection bus has a horizontal portion and a vertical portion that connect the first and second bus segment disconnectors, the detachable conductor is provided on the horizontal portion, and the tank includes the horizontal portion. It has a horizontal arrangement | positioning main trunk | drum accommodated, The said opening part is formed in the side surface of the said horizontal arrangement | positioning main trunk | drum, It is characterized by the above-mentioned.

According to the second aspect of the present invention, when one of the first and second bus-bar section disconnectors fails, the lid of the opening of the corresponding horizontally arranged main body is closed. Remove the detachable conductor inside and disconnect the faulty bus disconnector from the main circuit. Therefore, the faulty part can be separated without providing the detachable bus device.

According to a third aspect of the present invention, there is provided the gas insulated switchgear according to the first aspect, wherein the line is connected to the first line.
And a second line, wherein the bus section disconnector is provided corresponding to the first and second lines, and is a first and second bus section disconnectors that are juxtaposed vertically. The connection bus has a horizontal portion and a vertical portion connecting between the first and second bus segment disconnectors, and the tank has a vertical arrangement connection portion that accommodates both the horizontal portion and the vertical portion. And the opening is provided at upper and lower ends of the vertically arranged connecting portion.

In the gas insulated switchgear according to the third aspect of the present invention, the horizontal and vertical portions of the connecting bus are connected to the vertically arranged connecting portion for vertically connecting the first and second disconnecting switches for bus section. The openings are provided in the upper and lower ends of the vertically arranged connecting portion, so that the openings are provided in the horizontally arranged main body portion. Becomes even shorter.

According to a fourth aspect of the present invention, there is provided the gas insulated switchgear according to the third aspect, wherein the connecting equipment of the transformer bank and the first and second bus-bar section disconnectors are vertically connected to each other. The vertically arranged connecting part and the connecting device of the transformer bank are connected to each other via an elastic bellows, and the transformer is connected to the connecting bus in the vertically arranged connecting part. The connection portion of the bank with the connection device is constituted by a detachable internal conductor.

According to the present invention as described above, when a failure occurs in the transformer bank, the bellows are contracted to open the upper part of the connection bus, and the interior connected to the transformer bank. After removing the conductors, remove the transformer bank from the connection with the bellows.

The gas insulated switchgear according to a fifth aspect is the gas insulated switchgear according to the fourth aspect, wherein the vertically arranged connecting part includes an upper tank on the first busbar section disconnector side and the second tank. To the lower tank on the bus disconnector side
The vertical section of the connecting bus bar is configured to be divided into two by a slide contact.

According to the fifth aspect of the present invention, when a failure occurs in the connection bus, the disconnector for bus division and the transformer bank are connected through the opening above the vertically arranged connecting portion. Remove the detachable conductor. Then, after reducing the bellows to open the upper part of the connection bus, removing the inner conductor connected to the transformer bank, the vertical part of the connection bus connected by the slide contact is divided, thereby Remove the upper tank at the location connection.

A gas-insulated switchgear according to a sixth aspect of the present invention is the gas-insulated switchgear according to any one of the third to fifth aspects, wherein the first and second bus-bar section disconnectors and the transformer bank are provided. Is connected via a connection point between a horizontal portion and a vertical portion of the connection bus, and the connection point is removed to simultaneously connect the first and second bus segment disconnectors. A second detachable conductor to be separated is inserted.

According to the above-described sixth aspect of the present invention, when a failure occurs in both the first and second bus-bar section disconnectors, the first and second detachable conductors are detached, so that the first and second bus conductors are removed. Simultaneously disconnect the disconnectors for bus section.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. 9 to 11 are denoted by the same reference numerals, and the description of the same components will be omitted.

(1) First Embodiment One embodiment corresponding to the first and second aspects of the present invention will be described below with reference to FIGS. 1 and 2 as a first embodiment. explain. Note that the connection bus described in the claims is a connection bus, a PT connection bus, and a main circuit conductor, and the opening is a manhole. FIG. 1 is a front cross-sectional view of the present embodiment, and FIG. 2 is a cross-sectional view taken along the line XX of FIG.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the first and second bus-bar section disconnecting switches DS21 and DS22 are vertically arranged side by side, and the first and second lines L1 shown in FIG. , L2. First and second
A transformer bank connection device 13 is disposed at a position facing the bus disconnectors DS21 and DS22, and an instrument transformer PT is disposed below the second bus disconnecting switch DS22. . First and second bus disconnectors DS2
1, DS22 are connected to the transformer bank connection device 13 via the connection bus BS1, and the PT connection bus BS2
Is connected to the instrument transformer PT. The connection bus BS1, the PT connection bus BS2, and the main circuit conductor 10 are each configured by a combination of a horizontal portion and a vertical portion.

First and second bus-bar section disconnectors DS2
1, a tank 2 between the DS22 and the transformer bank connection device 13 includes a horizontal arrangement main body 2a in which horizontal portions of the main circuit conductor 10, the connection bus BS1 and the PT connection bus BS2 are accommodated.
2b. This horizontally disposed main body 2a,
As shown in FIG. 2, the manholes 4a,
4b is provided. At the horizontal portions of the main circuit conductor 10, the connection bus BS1 and the PT connection bus BS2 corresponding to the manholes 4a and 4b, detachable conductors 6a and 6b which can be detached by attaching and detaching the bolts 5a and 5b are provided. . The manholes 4a, 4b have a diameter that allows the detachable conductors 6a, 6b to be taken in and out, and are normally closed by a detachable lid.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, for example,
When the first bus segment disconnector DS21 fails, the cover of the manhole 4a is opened, the bolt 5a is removed, and the detachable conductor 6a is removed from the horizontal portion. Then, as shown in FIG. 3, in a state where the first bus disconnector DS21 is disconnected from the main circuit, operation can be performed by a circuit including the bus disconnector DS22. In addition, even when the second bus disconnector DS22 is out of order, the lid of the manhole 4b is opened and the detachable conductor 6a is removed to thereby remove the second bus disconnector DS22.
Disconnect.

(Effects) The effects of the present embodiment as described above are as follows. That is, the bus disconnector DS21,
Since no detachable bus device is inserted between DS22 and the connection bus BS1, the bus segment disconnectors DS21, DS
The size from 22 to the transformer bank connection device 13 can be reduced, and the space of the entire equipment is reduced.

The manholes 4a and 4b are provided at positions corresponding to the detachable conductors 6a and 6b, so that an opening for removing the detachable conductor 6a is secured, and a bellows having the same diameter as the tank is provided. Removal work is easier than in the case of expansion and contraction.

(2) Second Embodiment One embodiment corresponding to the first and third aspects of the present invention will be described below as a second embodiment with reference to FIG. FIG. 4 is a front sectional view of the present embodiment.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the first and second bus line section disconnecting switches DS21 and DS22 are juxtaposed vertically, and the first and second lines L1 and L1 shown in FIG. L2. At opposing positions of the first and second bus disconnectors DS21 and DS22,
A transformer bank connection device 13 is arranged, and a control panel C1 is arranged below the second busbar circuit breaker DS22.
The first and second bus disconnectors DS21 and DS22 are connected to the transformer bank connection device 13 via the connection bus BS1 and to the instrument transformer PT via the PT connection bus BS2. . The PT connection bus BS2
Are arranged not at the lower portion of the second busbar section disconnecting switch DS22 but at the opposing position, so that the instrument transformer PT is located diagonally below, not directly below the second busbar disconnecting switch DS22. ing.

The tank 2 is provided with a vertical arrangement connecting portion 7 for vertically connecting the first bus disconnector DS21 side and the second bus disconnector DS22 side. The connection bus BS1, the PT connection bus BS2, and the main circuit conductor 10 are each formed by a combination of a horizontal portion and a vertical portion. Openings 8 and 9 are provided in the upper and lower portions of the vertically arranged connecting portion 7. The main circuit conductor 10, the connection bus BS1, the PT connection bus BS2, and the first and second bus segment disconnectors DS21 near this opening.
The detachable conductors 6a and 6b similar to those of the first embodiment are arranged between the DS22 and the DS22. The openings 8, 9 have a diameter that allows the detachable conductors 6a, 6b to be taken in and out, and are normally closed by a detachable lid.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, for example,
When the first busbar section disconnector DS21 fails, the lid of the opening 8 is opened, the bolt 5a is removed, and the detachable conductor 6a is removed from the horizontal portion. Then, the first bus disconnector DS
21 is disconnected from the main circuit, and the bus disconnector DS
Operation can be performed in a circuit including the circuit 22. In addition, even when the second busbar section disconnecting switch DS22 fails, the lid of the opening 9 is opened, and the second detachable conductor 6a is removed.
Of the bus disconnector DS22.

(Effects) The effects of the present embodiment as described above are as follows. That is, in the present embodiment, the connection bus BS1, the PT connection bus BS2, and the horizontal portion and the vertical portion of the main circuit conductor 10 are both accommodated in the vertical arrangement connection portion 7, and the opening portions are formed above and below the vertical arrangement connection portion 7. 9, the first and second busbar section disconnectors DS21 and DS are different from the case where the manhole is provided in the horizontally disposed main body that accommodates only the horizontal portion as in the first embodiment.
22 between the center of the line 22 and the vertical portion of the connection bus BS1
Can be shortened.

(3) Third Embodiment One embodiment corresponding to the invention described in claims 1, 3, 4 and 6 is described as a third embodiment in FIG.
This will be described below with reference to FIG. FIG. 5 is a front sectional view of the present embodiment, and a description of the same components as those of the second embodiment will be omitted.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the connection bus B
An elastic bellows 14 is provided between S1 and the transformer bank connection device 13. And the main circuit conductor 1
The second detachable conductor 12 is provided at a connection point on the first bus line section disconnector DS21 side among connection points between the horizontal portion and the vertical portion of the connection bus BS1. The horizontal portion of the main circuit conductor 10 and the connection bus BS1 between the second detachable conductor 12 and the transformer bank connection device 13 is constituted by a detachable internal conductor 15.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, in order to remove only the transformer bank connection device 13, the detachable conductor 12 on the main circuit conductor 10 side is removed from the opening 8 so that the first and second bus-bar section disconnectors DS21 and DS
22 are both disconnected from the main circuit. Then, the detachable conductor 12 on the connection bus BS1 side is removed from the opening 8, and the bellows 14 is compressed, thereby removing the internal conductor 15.
Thus, the transformer bank connection device 13 is connected to the first and second transformers.
After disconnecting from the bus segment disconnectors DS21 and DS22, only the transformer bank connection device 13 is removed as shown in FIG.

(Effects) The effects of the present embodiment as described above are as follows. That is, when a failure occurs in the transformer bank T1, only the transformer bank connection device 13 can be easily removed, so that inspection, repair, and replacement work can be easily performed. In addition, the first and second bus-bar section disconnecting switches DS21 and DS22 can be simultaneously disconnected from the main circuit by one operation, so that both the first and second bus-bar section disconnecting switches DS21 and DS22 fail. Even if a problem occurs, prompt response is possible, and safety is improved.

(4) Fourth Embodiment One embodiment corresponding to the invention described in claim 4 will be described below as a fourth embodiment with reference to FIG. FIG. 7 is a front sectional view showing the present embodiment, and FIG.
The description of the same components as those of the embodiment is omitted.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the vertical arrangement connecting portion 7
Are provided in the upper tank 15 and the lower tank 16 so as to be divided into two. This upper tank 15 and lower tank 16
A flange portion 17 is formed at a joint portion between the two and is connected by a bolt 20. Furthermore, the main circuit conductors 10 in the upper tank 15 and the lower tank 16
And the vertical portion of the connection bus BS1 as a vertical conductor 18
It is provided in the vicinity of the flange portion 17 so as to be dividable. A slide contact 21 is formed at a connection portion between the upper and lower vertical conductors 18.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, the upper opening 8 is opened, and the detachable conductor 12 and the internal conductor 15 for connecting the bank connection device 13 are removed as in the third embodiment. Furthermore, the conductor in the upper tank is removed by removing the detachable conductor 6a connecting the busbar section disconnector DS21 and pulling out the upper vertical conductor 18. Then, the upper tank 15 is removed by compressing the bellows 14, as shown in FIG.

(Effects) The effects of the present embodiment as described above are as follows. That is, in the present embodiment, since only the upper tank 15 can be removed without removing the adjacent device, when a failure occurs in the connection bus, it is possible to respond in a short time and shorten the recovery time. Becomes

Note that the present invention is not limited to the above-described embodiment, and the size, shape,
The number, arrangement and the like can be changed as appropriate.

[0046]

As described above, according to the present invention,
By reducing the size of the circuit disconnecting structural portion adjacent to the bus section disconnecting switch, it is possible to provide a gas insulated switchgear in which the installation space of the entire facility is reduced.

Further, according to the present invention, it is possible to provide a gas insulated switchgear capable of easily and quickly removing a faulty device by enabling a conductor portion corresponding to a tank joint to be separated. Can be.

Further, according to the present invention, even if there are a plurality of disconnectors for bus division, a gas insulated switchgear can be quickly separated from the main circuit and has high safety. be able to.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a gas insulated switchgear of the present invention.

FIG. 2 is a cross-sectional view of the first embodiment in FIG.

FIG. 3 is a front sectional view showing a restarting state in the first embodiment of FIG. 2;

FIG. 4 is a front sectional view showing a second embodiment of the gas insulated switchgear of the present invention.

FIG. 5 is a front sectional view showing a third embodiment of the present invention.

FIG. 6 is a front sectional view showing a state in which the device is removed according to the third embodiment of FIG. 5;

FIG. 7 is a front sectional view showing a fourth embodiment of the gas insulated switchgear of the present invention.

FIG. 8 is a front sectional view showing a state in which the device is removed in the embodiment of FIG. 7;

FIG. 9 is a single-line diagram of a gas insulated switchgear having a general single-bus configuration.

FIG. 10 is a front sectional view showing an example of a conventional gas insulated switchgear using a detachable bus device at a disconnecting portion of a disconnecting switch for busbar division.

FIG. 11 is a front sectional view showing a state where a circuit is disconnected in the conventional example of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Detachable conductor 2 ... Tank 3 ... Main body part 4 ... Manhole 5 ... Bolt 6 ... Detachable conductor 7 ... Tank 8 ... Opening 9 ... Opening 11, 12 ... Detachable conductor 13 ... Transformer bank connection equipment 14, 33 ... Bellows 15 Upper tank 16 Lower tank 17 Connection flange 18 Vertical conductor 20 Bolt 21 Slide contact 31 Flange 32 Insulating spacer 34, 35 Connection conductor

Claims (6)

[Claims] 1. A bus for connection between a line and a transformer bank and a transformer for an instrument, a disconnector for a bus segment provided on the bus for connection, a transformer for the transformer and a transformer for an instrument. In a gas-insulated switchgear in which a detachable conductor for circuit disconnection provided on a connection bus between the bus segment disconnector and the bus is filled in a tank filled with an insulating gas, the detachable conductor corresponding to the detachable conductor in the tank A gas-insulated switchgear having a diameter at which the detachable conductor can be taken out and a sealable opening formed by a lid. 2. The line is a first and a second line, and the bus section disconnecting switch is provided corresponding to the first and the second line, and the first and the second lines are arranged vertically. 2 is a disconnector for bus section, wherein the connecting bus has a horizontal portion and a vertical portion connecting between the first and second disconnectors for bus section, and the detachable conductor is provided on the horizontal portion. The gas according to claim 1, wherein the tank has a horizontally arranged main body that accommodates the horizontal portion, and the opening is formed on a side surface of the horizontally arranged main body. Insulated switchgear. 3. The line is a first and a second line, and the bus section disconnector is provided corresponding to the first and the second line, and the first and the second lines are arranged vertically. 2 is a bus segment disconnector, wherein the connection bus has a horizontal portion and a vertical portion connecting between the first and second bus segment disconnectors, and the tank includes the horizontal portion and the The gas insulated switchgear according to claim 1, further comprising a vertically arranged connecting part accommodating the vertical part, wherein the opening is provided at upper and lower ends of the vertically arranged connecting part. 4. The connection device of the transformer bank and the first device.
And the second busbar section disconnector is disposed opposite to the vertical arrangement connecting portion, and the vertical arrangement connecting portion and the connection device of the transformer bank are connected via a telescopic bellows, 4. The gas insulated switchgear according to claim 3, wherein a connection portion of the transformer bank in the vertical arrangement connection portion with a connection device of the transformer bank is configured by a detachable internal conductor. 5. 5. The vertical arrangement connecting portion is configured to be able to be divided into two parts: an upper tank on the side of the first bus section disconnector and a lower tank on the side of the second bus section disconnector. 5. The gas insulated switchgear according to claim 4, wherein a vertical portion of the connection bus is configured to be divided into two by a slide contact. 6. The connection between the first and second bus segment disconnectors and a connection device of the transformer bank via a connection point between a horizontal portion and a vertical portion of the connection bus. The second detachable conductor for simultaneously disconnecting the first and second disconnectors for bus line division by being removed is inserted at a point, the second detachable conductor being inserted in the point. Gas insulated switchgear.