JP2005057831A - Gas insulated opening and closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that since common bus bar compartments of units are made to communicate to form a shared space, an insulating gas is filled in the shared space in the case of installing in a building site, and a work takes a great time duration. <P>SOLUTION: A gas insulated opening and closing device includes independent sealing spaces respectively formed in a common bus bar compartment 4 and a main circuit apparatus compartment 3, the insulating gas is filled in the respective sealing spaces. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas-insulated switchgear that is improved with respect to the treatment of insulating gas.
[0002]
[Prior art]
As shown in FIG. 9, the gas insulated switchgear is configured by combining a plurality of units 1 a, 1 b, 1 c. Each unit 1a, etc. is provided with a partition wall 2 in the casing, thereby connecting the main circuit equipment compartment 3 for drawing power from outside or sending power to the outside and the adjacent units to each other for power supply. It is divided into a common bus compartment 4 for supply. A bushing spacer 5 is provided at the boundary between the main circuit equipment compartment 3 and the common bus compartment 4, and the former and the latter are hermetically separated and filled with an insulating gas. 6 is a bus bar, 7 is a grounding disconnector, 8 is a circuit breaker, 9 is a current transformer, 10 is a lead-in cable, and 11 is a delivery cable. In addition, a compartment means each component which divided | segmented the part filled with insulating gas about the unit which comprises a gas insulated switchgear.
[0003]
In each of the units 1a, 1b, 1c,..., The portions of the common bus compartment 4 communicate with each other in the horizontal direction to form a common space and are filled with an insulating gas. In addition, the main circuit equipment compartment 3 that forms an independent space in each unit is individually filled with an insulating gas.
[0004]
In each unit, as a conventional gas insulated switchgear in which common bus compartments communicate with each other, there is the following (for example, refer to Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 05-304704 ((0008), FIGS. 1 and 3)
[0006]
[Problems to be solved by the invention]
However, since the common bus compartments of each unit are connected to form a common space, when installing the switchgear on site, the units are connected to each other and then insulated from the common bus compartment common space. Filling with gas takes a lot of time to work on-site. In addition, when expanding, all the insulating gas filled in the common space must be drained, and after the expansion, the insulating gas must be filled again, and a large amount of insulating gas is moved to extract and fill the insulating gas in the shared space. Will take a lot of time. In addition, quality control is difficult for gas processing in places where environmental management is severe.
[0007]
In addition, if any accident or malfunction occurs in the common bus compartment, it becomes a shared space, so the influence of the accident affects all units and all circuits stop.
[0008]
In addition, even if a major failure occurs in the main circuit equipment compartment, the common bus compartment and main circuit equipment compartment are joined together so that there is no problem during the removal and restoration of the equipment in the main circuit equipment compartment. The connected common bus is also removed at the same time, and all the circuits connected to the common bus are stopped, causing a serious problem.
[0009]
Then, this invention aims at providing the gas insulated switchgear which solved said subject.
[0010]
[Means for Solving the Problems]
The configuration of the gas insulation device according to claim 1 is characterized in that each of the common bus compartment and the main circuit equipment compartment is formed as an independent sealed space, and each sealed space is filled with an insulating gas.
[0011]
In such a gas-insulated switchgear, since the sealed space of the common bus compartment is made independent for each unit, if an accident or malfunction occurs in any unit, the spread of the accident etc. can be prevented beforehand, and the circuit and System reliability is greatly improved. In addition, the amount of gas to be processed at the time of recovery from an accident can be minimized, environmental gas can be easily treated and managed, and has a great environmental advantage.
[0012]
The structure of the gas insulation device according to claim 2 is the gas insulation switchgear according to claim 1, wherein the connection between adjacent common bus compartments is the first opening formed in one common bus compartment and the other A second opening formed in the common bus compartment is communicated in an air-tight manner through an extendable telescopic cylinder, and the end of the first bus in one common bus compartment is air-tightly connected through an insulating spacer. The end portion of the first bus bar is connected to the second bus bar of the other common bus compartment through an auxiliary conductor.
[0013]
In such a gas-insulated switchgear, after installing the gas-insulated switchgear, after connecting the first busbar penetrating the insulating spacer and the second busbar of the other common bus compartment through the auxiliary conductor, In addition, since the common bus compartment can be filled with insulating gas, installation work on site can be facilitated and reliability can be improved. In addition, new units can be connected only by gas treatment in the common bus compartment of adjacent units when they are added, greatly reducing on-site work time and power outage time.
[0014]
According to a third aspect of the present invention, there is provided a gas insulated switchgear according to the second aspect, wherein the connecting portion between the auxiliary conductor and the end of the first bus bar is detachable.
[0015]
In such a gas-insulated switchgear, the auxiliary conductor and the first bus bar are detachable, so the connection work between the first bus bar and the second bus bar becomes easy.
[0016]
The configuration of the gas insulation device according to claim 4 is the gas insulation device according to claim 1, wherein the connection between the adjacent common bus compartments is the same as that of the gas insulation switchgear according to claim 1, wherein one common bus compartment is connected. A first insulating spacer that hermetically closes the first opening formed in the second bus is provided, and a second insulating spacer that hermetically closes the second opening formed in the other common bus compartment is hermetically sealed via a telescopic telescopic cylinder. The other end of the connecting conductor, which is provided on the other end of the common bus compartment with the end of the first bus bar penetrating the first insulating spacer in an airtight manner, and having one end connected to the second bus bar of the other common bus compartment via an expansion / contraction means Are hermetically penetrated through the second insulating spacer, and the first insulating spacer and the second insulating spacer are detachably fitted to each other, so that the first conductors facing each other are fitted. When portion facing the second conductor, characterized in that it has to be removably fitted.
[0017]
In such a gas insulated switchgear, even if the buses of the common bus compartment are connected or not connected, the insulating gas of the common bus compartment of each unit is always sealed independently, During installation or expansion, the first insulating spacer and the second insulating spacer are fitted to each other, so that the other end of the connecting conductor is automatically fitted to the end of the second bus and the connection of the bus is completed. Gas treatment is completely unnecessary. For this reason, the reliability is greatly improved, and the working time can be greatly shortened.
[0018]
According to a fifth aspect of the present invention, in the gas insulated switchgear according to the fourth aspect, a substantially U-shaped flexible conductor is used as the expansion / contraction means, and the second busbar and the connection conductor are used. The opposite ends are coupled to one end and the other end of the flexible conductor.
[0019]
In such a gas insulated switchgear, the connection conductor is expanded and contracted by opening and closing the upper portion of the substantially U-shaped portion of the flexible conductor.
[0020]
According to a sixth aspect of the present invention, in the gas insulated switchgear according to the fourth aspect of the present invention, as the expansion / contraction means, any one of end portions of the second bus bar and the connection conductor facing each other is used. A protrusion formed on the other is slidably fitted into the formed recess.
[0021]
In such a gas-insulated switchgear, the connecting conductor is expanded and contracted by increasing or decreasing the insertion amount of the convex portion into the concave portion. When a substantially U-shaped flexible conductor is used, the direction of the current flowing through the flexible conductor is reversed between the right side and the left side and is affected by the electromagnetic repulsive force. High nature.
[0022]
The structure of the gas insulation device according to claim 7 is the gas insulation switchgear according to claim 1, further comprising contact / separation means for moving the main circuit device compartment toward and away from the common bus compartment. And
[0023]
In such a gas-insulated switchgear, only the main circuit equipment compartment is connected to the common bus compartment by operating the contacting / separating means while the common bus is connected when the accident occurs in the main circuit equipment compartment. Can be removed and replaced. For this reason, it is possible to greatly reduce the time required for recovery, reduce the power failure time, and eliminate the influence on other healthy units.
[0024]
The configuration of the gas insulation device according to claim 8 is the gas insulation switchgear according to claim 7, wherein the connection between the common bus compartment and the main circuit equipment compartment is a third opening formed in the common bus compartment. The third conductor is hermetically penetrated through the third insulating spacer, the fourth conductor is hermetically penetrated through the fourth opening formed in the main circuit device compartment through the fourth insulating spacer, and the third insulation The spacer and the fourth insulating spacer are detachably fitted so that the facing portions of the third conductor and the fourth conductor facing each other are detachably fitted.
[0025]
In such a gas-insulated switchgear, each compartment is always in an independently sealed state, regardless of whether the main circuit equipment compartment is connected to the common bus compartment or not. When the main circuit equipment compartment is removed or restored, the third insulating spacer and the fourth insulating spacer are automatically fitted to and separated from each other by fitting and separating the third insulating spacer and the fourth insulating spacer. Separation takes place. As a result, the common bus compartment and the main circuit equipment compartment are coupled and separated, and no gas treatment is required. For this reason, it is possible to greatly improve the reliability and greatly reduce the working time.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a gas insulated switchgear according to the present invention will be described below.
[0027]
(A) Embodiment 1
First, the first embodiment is shown in FIG. Since the gas-insulated switchgear according to Embodiment 1 is obtained by improving a part of the conventional gas-insulated switchgear of FIG. 9, only different parts will be described.
[0028]
In the gas insulated switchgear, an independent sealed space is formed in each of the common bus compartment 4 and the main circuit equipment compartment 3, and each sealed space is filled with an insulating gas. The relationship between the adjacent common bus compartments 4 is configured as follows.
[0029]
Adjacent common bus compartments 4 are connected to each other in the first opening 16a of the first partition 15a that forms the left wall of the common bus compartment 4 on one side (right side) in FIG. The second opening 16b of the second partition wall 15b that forms the right wall of the common bus compartment 4 on the left side is in airtight communication with the extendable telescopic cylinder 17. Although the end portion of the first bus bar 6 of the right common bus compartment 4 may be directly passed through the insulating spacer 19, in this embodiment, instead of the first bus bar 6, a cylindrical embedded conductor connected thereto 20 is passed through the first opening 16a in an airtight manner through an insulating spacer 19. Then, the end face of the embedded conductor 20 and the second bus bar 6 of the left common bus compartment 4 are connected via an L-shaped auxiliary conductor 18. One end of the telescopic cylinder 17 is coupled to the second partition 15b, the flange 21 is coupled to the other end, and the flange 21 is coupled to the first partition 15a. Reference numeral 22 denotes a support insulator.
[0030]
In each unit, the main circuit conductor 23 in the main circuit equipment compartment 3 penetrates the partition wall 2 through the insulating spacer 5, and a ground disconnection is provided between the main circuit conductor 23 and the second bus 6, for example. A vessel 7 is provided. The ground disconnector 7 is rotatably coupled to a main circuit contact 7a coupled to the second bus bar 6, a ground circuit contact 7b grounded via a ground conductor, and the main circuit conductor 23, and is not shown in the drawing. The blade 7c is connected to the means and is in contact with the main circuit contact 7a or the ground circuit contact 7b. A work port is formed in the ceiling surface of the common bus compartment 4, and a lid 24 is provided in the work port.
[0031]
In such a gas-insulated switchgear, since the sealed spaces of the common bus compartments 4 of the adjacent units are separated by the insulating spacers 19 and are independent of each other, there is no accident or malfunction in the common bus compartment 4 of any unit. In such a case, it is possible to prevent an accident or the like from spreading to the common bus compartment 4 of other units, and the reliability of the circuit and system is greatly improved. Further, the amount of gas to be processed at the time of recovery from an accident is one unit, which is the minimum, and it is easy to treat and manage environmental gas, and has a great advantage over the environment.
[0032]
When installing the gas insulated switchgear, the embedded conductor 20 connected to the first bus 6 of one common bus compartment 4 and penetrating the insulating spacer 19 and the second bus 6 of the other common bus compartment 4 are assisted. After connecting through the conductor 18, the work port is closed with the lid 24, and the operation of filling the insulating gas into the common bus compartment 4 is repeated to install a plurality of units in order. Therefore, the reliability can be improved. Since the length of the telescopic cylinder 17 can be freely adjusted, it is possible to cope with fluctuations in the interval between the adjacent common bus compartments 4. In addition, a new unit can be connected only by gas treatment of the adjacent unit even at the time of expansion, and the work time and power failure time at the site are greatly reduced. Further, when the unit is removed, the auxiliary conductor 18 is removed from the working port after performing gas treatment with the corresponding unit or the unit adjacent to the corresponding unit, and then the flange 21 is removed from the first partition wall 15a. be able to.
[0033]
(B) Embodiment 2
Next, Embodiment 2 is shown in FIG. In this embodiment, a part of the first embodiment is changed, and the buses of adjacent units can be connected and separated without removing the insulating gas of the adjacent common bus compartment 4. Therefore, only the parts different from the first embodiment will be described.
[0034]
In this embodiment, a connecting portion between the first bus bar 6 and the second bus bar 6 is detachable. Instead of the auxiliary conductor 18, an L-shaped auxiliary conductor 25 and a cylindrical auxiliary conductor 26 are provided, and the auxiliary conductor 26 and the embedded conductor 20 are embedded in a convex portion 26 a formed at the end of the auxiliary conductor 26 and the embedded conductor 26. It is comprised by the recessed part 20a formed in the penetration conductor 20, and the connection contact which is not illustrated interposes between the convex part 26a and the recessed part 20a.
[0035]
In such a gas-insulated switchgear, the auxiliary conductor 26 and the embedded conductor 20 can be attached and detached simply by fitting and detaching the convex portion 26a and the concave portion 20a. Connection / separation work with 6 becomes easy. Further, since the auxiliary conductor 26 disposed inside the telescopic cylinder 17 has a circular outer diameter, the electrolysis is relaxed and the reliability is improved, and the field work / power failure time can be further reduced.
[0036]
Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.
[0037]
(C) Embodiment 3
Next, Embodiment 3 is shown in FIG. This embodiment is different from the first and second embodiments only in the connection structure between the first bus bar and the second bus bar of the adjacent units, and only the different parts will be described.
[0038]
Connections between adjacent common bus compartments 4 are as shown in FIG. A first insulating spacer 19 that hermetically closes the first opening 16a of the first partition wall 15a that forms one common bus compartment 4 is provided. Further, the second insulating spacer 28 that hermetically closes the second opening 16b of the second partition wall 15b forming the other common bus compartment 4 and is detachably fitted to the first insulating spacer 19 is extendable. It is provided airtight via a flexible telescopic cylinder 17. An end portion of the first bus bar 6 of one common bus compartment 4 is hermetically penetrated through the first insulating spacer 19, and one end thereof is substantially U-shaped and flexible to the second bus bar 6 of the other common bus compartment 4. The other end of the connection conductor 29 connected via the conductor (expandable / contracting means) 30 is detachably fitted to the end of the first bus 6.
[0039]
The relationship between the first insulating spacer 19 and the second insulating spacer 28 will be described below. The second insulating spacer 28 is coupled to the inside of the flange 21 coupled to the end of the telescopic cylinder 17, and the second insulating spacer 28 has a disk-shaped protruding portion 28 a so as to fit into the opening 16 a. A circular recess 28b is formed at the center of the protrusion 28a. On the other hand, the first insulating spacer 19 is formed with a convex portion 19a fitted into the concave portion 28b.
[0040]
Next, the configuration of the coupling portion between the connection conductor 29 and the first bus 6 will be described. A convex portion 29a is formed at the end portion of the connection conductor 29, while a concave portion 6a is formed at the end portion of the first bus bar 6, and a connection contact (not shown) is interposed between the convex portion 29a and the concave portion 6a. ing.
[0041]
In such a gas-insulated switchgear, the insulating gas in the common bus compartment 4 of each unit is always sealed independently regardless of whether the bus 6 of the common bus compartment 4 is connected or not connected. It is in. During installation or expansion, the convex portion 19a of the first insulating spacer 19 is fitted into the concave portion 28b of the second insulating spacer 28 so that the convex portion 29a of the connection conductor 29 is fitted into the concave portion 6a of the second bus bar. Thus, the connection between the buses is completed, and no gas treatment is required. For this reason, it is possible to greatly improve the reliability and greatly reduce the working time.
[0042]
When the bus bars are connected or disconnected, the upper portion of the substantially U-shaped portion of the flexible conductor 30 opens and closes simultaneously with the expansion and contraction of the telescopic cylinder 17, so that the connection between the insulating spacers and the bus bars are performed. Can be connected simultaneously with other connections.
[0043]
Since other configurations and operations are the same as those of the second embodiment, description thereof is omitted.
[0044]
(D) Embodiment 4
Next, Embodiment 4 is shown in FIG. Since this embodiment is obtained by changing the configuration of the expansion / contraction means in the third embodiment, only different parts will be described.
[0045]
Instead of the substantially U-shaped flexible conductor (stretching means) 30, a concave portion 29 b is formed in the connection conductor 29 in the end portion where the second bus 6 and the connection conductor 29 face each other. A convex portion 6b is formed on the bus bar 6, and the convex portion 6b is slidably fitted into the concave portion 29b via a connection contact (not shown).
[0046]
In such a gas insulated switchgear, the connection conductor 29 is expanded and contracted by increasing or decreasing the amount of insertion of the convex portion 6b into the concave portion 29b. When the substantially U-shaped flexible conductor 30 is used, the direction of the current flowing through the flexible conductor 30 is reversed between the right side and the left side and is affected by the electromagnetic repulsive force. There is no such thing and the reliability is high.
[0047]
Since other configurations and operations are the same as those of the third embodiment, description thereof is omitted.
[0048]
(E) Embodiment 5
Next, Embodiment 5 is shown in FIG. In this embodiment, in the first embodiment, the main circuit device compartment can be separated from the common bus compartment by approaching and separating. Since only a part of the first embodiment is changed, only different parts will be described. .
[0049]
In the gas insulated switchgear shown in the first embodiment, an elevator (contact / separation means) 31 is provided on the floor frame 32 in order to bring the main circuit device compartment 3 closer to and away from the common bus compartment 4. A main circuit equipment compartment 3 is provided. As the lifting device 31, a jack or the like having an existing configuration is used. Further, in order to increase the coupling strength between the common bus compartments 4 when only the main circuit equipment compartment 3 is lowered, the upper portions of the common bus compartments 4 are coupled via a substantially U-shaped fixed frame 33. ing.
[0050]
In such a gas-insulated switchgear, recovery is performed as follows when an accident occurs in the main circuit equipment compartment 3. By operating the ground disconnector 7 while the common bus 6 between the adjacent common bus compartments 4 is connected, the blade 7c is brought into contact with the ground circuit contact 7b, and the main circuit device compartment 3 is mainly connected. The circuit conductor 23 and the like are grounded. Next, after recovering only the insulating gas in the main circuit equipment compartment 3, the lower part of the main circuit conductor 23 is separated from the other conductors, and the lifting device 31 is actuated, thereby causing the main circuit equipment compartment 3 as shown in FIG. Only the main circuit unit compartment 3 is removed or replaced alone. For this reason, it is possible to greatly reduce the time required for recovery, reduce the power failure time, and eliminate the influence on other healthy units.
[0051]
Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.
[0052]
(F) Embodiment 6
Finally, Embodiment 6 is shown in FIG. This embodiment is a modification of part of the fifth embodiment, so that the upper and lower compartments can be connected and separated without removing the insulating gas between the common bus compartment 4 and the main circuit equipment compartment 3. Therefore, only the differences from the fifth embodiment will be described.
[0053]
As shown in FIG. 7, the common bus compartment 4 and the main circuit equipment compartment 3 are connected. The third conductor 38 is hermetically penetrated through the third opening 34 a of the third partition 34 forming the common bus compartment 4 via the third insulating spacer 36, and the fourth partition 35 of the fourth partition 35 forming the main circuit device compartment 3 is inserted. A fourth conductor 39 is hermetically penetrated through the fourth opening 35 a via a fourth insulating spacer 37. As shown in FIG. 8, in order to fit the third insulating spacer 36 into the third opening 34 a of the third partition wall 34, the third insulating spacer 36 is formed with a disk-shaped convex portion 36 a. Further, in order to detachably fit the third insulating spacer 36 and the fourth insulating spacer 37, a concave portion 36b is formed in the center of the convex portion 36a, while the fourth insulating spacer 37 has a convex portion 37a. Is formed. Of the opposed portions of the third conductor 38 and the fourth conductor 39 facing each other, the third conductor 38 has a convex portion 38a, and the fourth conductor 39 has a concave portion 39a. The part 38a is detachably fitted to the recess 39a. The fourth conductor 39 is connected to other conductors in the main circuit device compartment 3.
[0054]
In such a gas-insulated switchgear, each compartment is always in an independently sealed state regardless of whether the main circuit equipment compartment 3 is connected to the common bus compartment 4 or not. is there. When the main circuit device compartment 3 is removed or restored, when the third insulating spacer 36 and the fourth insulating spacer 37 are fitted, the end of the third conductor 38 and the end of the fourth conductor 39 are automatically Is thus fitted, the connection / separation of the conductor is completed, and no gas treatment is required. For this reason, it is possible to greatly improve the reliability and greatly reduce the working time.
[0055]
Since other configurations and operations are the same as those of the fifth embodiment, the description thereof is omitted.
[0056]
In addition, although the convex part and the recessed part are formed in the part which opposes the insulating spacer and conductor in this Embodiment, you may replace a convex part and a recessed part mutually.
[0057]
【The invention's effect】
As can be seen from the above description, according to the gas-insulated switchgear according to the present invention, an independent sealed space is formed in each of the common bus compartment and the main circuit equipment compartment, and each sealed space is filled with an insulating gas. When an accident or malfunction occurs in any unit, the spread of the accident or the like is prevented and the reliability of the circuit and system is greatly improved. In addition, since the common bus compartment and main circuit equipment compartment form an independent sealed space, the amount of gas that must be treated during accident recovery can be minimized, and environmental gas can be handled and managed easily. And has a significant environmental advantage.
[Brief description of the drawings]
FIG. 1 relates to Embodiment 1 of a gas-insulated switchgear according to the present invention, (a) is a configuration diagram showing a portion of a common bus compartment of each unit, and (b) is a diagram of a common bus compartment with the unit assembled. The block diagram which shows a part.
FIG. 2 is a configuration diagram showing a portion of a common bus compartment in a state where a unit is assembled in Embodiment 2 of a gas insulated switchgear according to the present invention.
FIG. 3 relates to a third embodiment of the gas insulated switchgear according to the present invention, in which (a) is a configuration diagram showing a portion of a common bus compartment of each unit, and (b) is a diagram of the common bus compartment with the unit assembled. The block diagram which shows a part.
FIG. 4 is a configuration diagram showing a portion of a common bus compartment in a state where a unit is assembled in Embodiment 4 of a gas insulated switchgear according to the present invention.
FIG. 5 is a configuration diagram showing a state where a unit is assembled in a gas insulated switchgear according to a fifth embodiment of the present invention;
FIG. 6 is a configuration diagram showing a state in which a main circuit equipment compartment is separated from a common bus compartment in Embodiment 5 of a gas insulated switchgear according to the present invention;
FIG. 7 is a configuration diagram showing a state where a unit is assembled in a sixth embodiment of a gas insulated switchgear according to the present invention;
FIG. 8 is a configuration diagram showing a state in which the main circuit equipment compartment is separated from the common bus compartment in the sixth embodiment of the gas insulated switchgear according to the present invention;
FIG. 9 relates to a conventional gas insulated switchgear, where (a) is a front view and (b) is a right side view.
FIG. 10 is a circuit diagram of a conventional gas insulated switchgear.
[Explanation of symbols]
3. Main circuit equipment compartment
4 ... Common bus compartment
6 ... Bus
6a, 26a, 29b ... concave portion
6b, 20a, 29a ... convex portion
16a, 16b ... opening
17 ... telescopic cylinder
18 ... Auxiliary conductor
19, 28 ... Insulating spacer
25, 26 ... connecting conductor
29 ... Connection conductor
30 ... Flexible conductor
31 ... Lifting device
36. Third insulating spacer
37. Fourth insulating spacer
38 ... Third conductor
39 ... Fourth conductor

Claims (8)

In a gas insulated switchgear comprising a plurality of units, each unit comprising a common bus compartment for connecting the units and a main circuit equipment compartment for connecting the units to the outside. ,
A gas insulated switchgear characterized in that each of the common bus compartment and the main circuit equipment compartment is formed as an independent sealed space, and each sealed space is filled with an insulating gas. Adjacent common bus compartments are connected to each other in a gas-tight manner by connecting a first opening formed in one common bus compartment and a second opening formed in the other common bus compartment via a telescopic telescopic cylinder. And let the end of the first bus of one common bus compartment pass through the first opening through an insulating spacer in an airtight manner, and connect the end of the first bus and the second bus of the other common bus compartment 2. The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is connected via an auxiliary conductor. The gas-insulated switchgear according to claim 2, wherein a coupling portion between the auxiliary conductor and the end portion of the first bus bar is detachable. Adjacent common bus compartments are connected to each other by providing a first insulating spacer that hermetically closes the first opening formed in one common bus compartment, and hermetically closing the second opening formed in the other common bus compartment The second insulating spacer is hermetically provided through a telescopic telescopic cylinder, the end of the first bus bar of one common bus compartment is hermetically penetrated through the first insulating spacer, and one end of the first common bus compartment is connected to the other common bus compartment. The other end of the connecting conductor connected to the second bus bar via the expansion / contraction means is hermetically penetrated through the second insulating spacer, and the first insulating spacer and the second insulating spacer are detachably fitted, 2. The gas insulated switchgear according to claim 1, wherein opposing portions of the first conductor and the second conductor facing each other are detachably fitted. . A substantially U-shaped flexible conductor is used as the expansion / contraction means, and opposite ends of the second bus bar and the connection conductor are coupled to one end and the other end of the flexible conductor, The gas insulated switchgear according to claim 4. As the expansion / contraction means, a convex portion formed on the other is slidably fitted in a concave portion formed on one of the opposing ends of the second bus bar and the connecting conductor. The gas insulated switchgear according to claim 4. 2. The gas insulated switchgear according to claim 1, further comprising contact / separation means for moving the main circuit device compartment toward and away from the common bus compartment. The connection between the common bus compartment and the main circuit equipment compartment is formed in the main circuit equipment compartment by allowing a third conductor to pass through a third opening formed in the common bus compartment airtightly through a third insulating spacer. The fourth conductor is hermetically penetrated through the fourth opening through the fourth insulating spacer, and the third insulating spacer and the fourth insulating spacer are detachably fitted to each other, so that the third facing each other. 8. The gas insulated switchgear according to claim 7, wherein a facing portion between the conductor and the fourth conductor is detachably fitted.

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