JPH08340610A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: To provide a gas insulated switchgear capable of changing the structure by vertical transposition, of the whole of or a part a hermetically sealed container having a built-in vacuum circuit breaker. CONSTITUTION: A gas insulated switchgear 1 uses a vacuum circuit breaker 2 and a hermetically sealed container 3, compared to a former example. The vacuum circuit breaker 2 has a hermetic flange 21 having a plurality of through holes formed fitting the center of the pitch interval dimension 2C of centers to the center of the pitch interval dimension 2B of respective centers of the contacts 83, 84. And individual through holes are formed at positions being surface-symmetrical, concerning a plane containing a center line 2A connecting the center of the pitch interval dimension 2B and the center of the pitch interval dimension 2C. The hermetically sealed container 3 has threaded holes having bottoms formed fitting the center of the pitch interval dimension 3C to the center of the pitch interval dimension 3B of respective centers of stationary-side members 73, 74, around through holes 31 at positions being opposed to individual through holes that the hermetic flange 21 has.

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 at least a vacuum circuit breaker is mounted in a sealed container filled with an electrically insulating gas. Regarding the improved configuration.

[0002]

2. Description of the Related Art High voltage or extra high voltage (voltage value of 7.2 to
In a switchgear used for power receiving and transforming equipment connected to a power distribution system of 36 [kV], a vacuum circuit breaker is used as a circuit breaker, and this vacuum circuit breaker or, together with the vacuum circuit breaker, is electrically connected to the vacuum circuit breaker. A gas-insulated switchgear having a configuration in which the related electrical equipment is mounted in a sealed container filled with an electrically insulating gas has been adopted.

An example of a conventional example of such a gas insulated switchgear will be described first with reference to FIG. Here, FIG. 3 is a vertical cross-sectional view showing a main part of a conventional gas-insulated switchgear together with a cable. In FIG. 3, 9 is a vacuum circuit breaker 8,
Sealed container 4, sending disconnector 51, grounding switch 52,
Known surge arrester 53, busbar disconnector 54, current transformer 55, cable terminator 61, cable bracket 62, solid busbar 63, connecting conductor 7, known through bushing 78,
The gas insulated switchgear includes a base 97, a front door 98, and a back door 99. The gas-insulated switchgear 9 has a cable 96 connected to a power supply or load device (not shown).
Is held by the cable bracket 62 and then connected to the cable terminator 61, which is a cable connector. Thus, the gas-insulated switchgear 9 is provided with the cable 96 connected to one electric end and the solid bus 63 as the other electric end.

The hermetically sealed container 4 includes a storage chamber 41 for accommodating a vacuum circuit breaker 8, a disconnecting switch 51 for discharging, a grounding switch 52, and a lightning arrester 53, and a storage chamber 42 for accommodating a busbar disconnecting device 54 therein. The storage chamber 41 and the storage chamber 42 are airtightly partitioned by a partition plate 43. Each of the storage chambers 41 and 42 is filled with an electrically insulating gas such as SF ₆ . The sealed container 4 is generally formed by using a relatively thick metal plate, and the vacuum circuit breaker 8,
Sending disconnector 51, bushing 521 for grounding switch 52, busbar disconnector 54, cable terminator 61,
A through hole having an area into which each device can be inserted is formed in a container wall made of a relatively thick metal plate at a portion where the solid bus 63 and the like are mounted. Then, around each of the through holes of the container wall of the hermetically sealed container 4, in the case of the vacuum circuit breaker 8 as an example, a plurality of through holes of an airtight flange 82 described later are provided so as to correspond to the through holes. A bottomed screw hole is formed. This sealed container 4
Is installed on the base 97, and the front door 98 and the back door 99 are attached to form the structure of the gas insulated switchgear 9.

The vacuum circuit breaker 8 includes a housing 81, an airtight flange 82, a circuit breaker main body (not shown), and contacts 8 which form a pair.
3, 84 is a known electric device that turns on / off a current flowing in the circuit. The circuit breaker main body is built in the housing 81 and has a movable contactor and a fixed contactor (not shown). The contacts 83, 84 are respectively installed on the outer wall of the housing 81, and are electrically connected to the movable contacts and the fixed contacts of the breaker body. The airtight flange 82 is formed integrally with the housing 81 and is a flange for mounting the vacuum circuit breaker 8 on the container wall of the sealed container 4. The airtight flange 82 has a groove for accommodating a seal body such as an O-ring for keeping airtight between the airtight flange 82 and the container wall, and the airtight flange 82 is fastened to the container wall of the hermetic container 4. A plurality of through holes (not shown) for mounting screws (not shown) are formed. And then
In the vacuum circuit breaker 8, the above-mentioned plurality of through holes of the airtight flange 82 are formed in the symmetrical relational positions with each other, and the contacts 83, 84 are the vacuum circuit breaker 8
In order to reduce the size of the airtight flange 82, the airtight flange 82 is generally installed at a position asymmetric with respect to the centerline of the attachment.

The vacuum circuit breaker 8 has a movable contact and a fixed contact which are paired with each other for turning on / off a current in the circuit breaker body. In order to make sure that the circuit current can be turned on and off reliably, it is necessary that the movable contact at the time of turning on and off approaches the fixed contact at a predetermined speed and moves away from the fixed contact. . In addition, in the closed state, the movable contactor must also contact the fixed contactor with a predetermined pressing force so that a large circuit current at the time of failure can flow through without any hindrance. The vacuum circuit breaker 8 also has an operating device (not shown) that satisfies the conditions required for the movable contact in the housing 81. This operating device has a structure that takes into account the mass of the movable contact and the movable portion (not shown) that supports the movable contact, while satisfying the above conditions for the movable contact,
It has a compact and lightweight structure.

Further, the sending disconnecting switch 51 is provided with a vacuum breaker so that the high voltage for the withstand voltage test is not applied to the vacuum circuit breaker 8 when the withstand voltage test of the cable 96 is performed. When opening the electric circuit to which the circuit breaker 8 is connected, or when opening the vacuum circuit breaker 8, the electric circuit to which the vacuum circuit breaker 8 is connected is installed for double opening for safety. It is an electric device. Ground switch 52
Performs maintenance work inside the sealed container 4 or the cable 96
When some work is performed on the side, the vacuum circuit breaker 8 is connected for safety after disconnecting the electric circuit to which the vacuum circuit breaker 8 is connected from the side of the cable 96 so that no voltage is applied. This is an electric device installed so that an electric circuit can be grounded, and one end thereof is guided to the outside of the hermetically sealed container 4 via a through bushing 521 for the grounding switch 52. The busbar disconnector 54 is provided to disconnect the vacuum circuit breaker 8 from the circuit and prevent a voltage from being applied to the vacuum circuit breaker 8 when performing maintenance work in a room in which the vacuum circuit breaker 8 is installed. It is an installed electrical device. Current transformer 5
5 is shown in this case as a known through-type current transformer.

The cable terminator 61 is a cable 9
6 is an electric device for connecting the gas-insulated switchgear 9 to the gas-insulated switchgear 9, not to mention the charging section of the cable terminator 61.
The charging portion of the cable 96 is also configured not to be exposed at the cable terminator 61. The cable bracket 62 is an instrument for mechanically holding the cable 96 on the container wall of the sealed container 4. Solid bus 63
Is a busbar that connects between the gas-insulated switchgear 9 and another electric device installed together with the gas-insulated switchgear 9, such as a power receiving and transforming facility in which the gas-insulated switchgear 9 is installed. A hard synthetic resin material is used for the insulating layer.

The connection conductor 7 is provided with respective fixed side members 73 and 74 made of a conductive material and having a cylindrical shape, which are detachably connected to the contactor 83 and the contactor 84 of the vacuum circuit breaker 8. It is composed of conductor pieces 71, 72 for use.
The connecting conductor piece 71 including the fixed side member 73 connected to the contactor 83 is connected to the feed disconnector 51, and the connecting conductor piece 71 includes the fixed side member 74 connected to the contactor 84. 72 is connected to the busbar disconnector 54 via a through bushing 78. This through bushing 78
Are mounted on the partition plate 43.

The conventional gas-insulated switchgear 9 is constructed as described above, and when installed in a power receiving and transforming facility, the cable 96 is installed on the floor (not shown) on which the gas-insulated switchgear 9 is installed. A wiring pit (not shown) formed in a groove shape is drawn around and wired up to the gas insulated switchgear 9, and is connected to the gas insulated switchgear 9 from the lower side.
That is, the gas-insulated switchgear 9 is a gas-insulated switchgear having a configuration corresponding to the cable wiring method of pulling the cable 96 from the lower side, and hereinafter, the cable wiring method of pulling the cable 96 from the lower side of the gas-insulated switchgear. May be referred to as pit wiring.

FIG. 4 is a vertical cross-sectional view showing a main part of a different conventional gas insulated switchgear together with a cable, and FIG. 5 is a single wire connection diagram of the gas insulated switchgear shown in FIG. . 4 and 5, the same parts as those of the conventional gas-insulated switchgear 9 shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. 9A is the same as the conventional gas-insulated switchgear 9 shown in FIG. 3, but instead of the hermetic container 4, in this case, the hermetic container 4A is used as a hermetic container that can be divided into three parts. It is a gas-insulated switchgear that

The sealed container 4A includes a partial container 45, a partial container 46 and a partial container 47, a partial container 45 and a partial container 4
6 is provided with a partition plate 48 that airtightly partitions it from each other, and a partition plate 49 that airtightly partitions the partial container 46 and the partial container 47 from each other. Airtight flanges are formed on the partial containers 45 to 47 at the portions to be joined to each other, the partition plate 48 is each airtight flange of the partial containers 45 and 46, and the partition plate 49 is the partial container 46. , 47 and the airtight flanges of the sealed container 4A.
Built into. These partition plates 48 and 49 are formed so that they can be mounted on either side of the partial container 46, that is, the upper side and the lower side in FIG. Then, the hermetically sealed container 4A, with the partition plates 48 and 49 being sandwiched,
By the airtight flanges of the partial containers 45 to 47, they are integrated while maintaining the airtight state, for example, similarly to the gas-insulated switchgear 9 according to FIG.

The hermetically sealed container 4A includes a storage chamber 45A formed by a partial container 45 and a partition plate 48, a storage chamber 46A formed by a partial container 46 and partition plates 48, 49, and a partial container 47. A storage chamber 47A formed by the partition plate 48 is provided. Storage room 45
Each of A, 46A and 47A is filled with an electrically insulating gas such as SF ₆ as in the case of the gas insulated switchgear 9. Both the storage chamber 45A and the storage chamber 47A store therein a grounding switch 52 and a disconnecting switch 56, and a cable terminator 61 is attached to the container walls of the partial containers 45 and 47, respectively. . Further, through bushings 78 are mounted on the partition plates 48 and 49, respectively, and a solid bus bar 63 is mounted on the container wall of the partial container 46.

Then, as in the case of the gas-insulated switchgear 9, through holes having an area into which the respective devices can be inserted are formed in the container walls of the partial containers 45 to 47 constituting the hermetically sealed container 4A. Are formed. In addition to this, a handhole is formed on the container wall opposite to the portion of the partial container 46 where the solid bus bar 63 is mounted, and this handhole is airtightly covered by the blind plate 46B. .

In the gas-insulated switchgear 9A according to FIG. 4, each cable 96 is routed in a wiring pit (not shown) to be wired to the gas-insulated switchgear 9A, and is connected to the gas-insulated switchgear 9A from the lower side. There is. But,
Depending on the power receiving and transforming equipment or the like, the cable 96 may be routed above the gas insulated switchgear 9A or the like by using a rack (not shown) instead of routing it inside the wiring pit. In the gas-insulated switchgear 9A, the partial container 45,
Since 47 and the partition plates 48 and 49 are configured as described above, the positional relationship between the partial container 45 and the partial container 47 with respect to the partial container 46 can be inverted and attached. For this reason, as a coping method when the wiring method of the cable 96 is different, in the gas insulated switchgear 9A,
It is possible to invert the positional relationship of the partial containers 45 and 47 with respect to the partial container 46 and attach them, and change the configuration as the gas insulated switchgear 9B as shown in FIG. In FIG. 6, the same parts as those of the conventional gas-insulated switchgear 9, 9A shown in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG.
Regarding the reference numerals given in FIG. 4, only representative reference numerals are shown.

That is, in the different conventional examples shown in FIGS. 4 and 6, a gas-insulated switchgear 9B having a structure corresponding to the cable wiring method of pulling the cable 96 from the upper side,
It can be configured using the same main parts as the gas-insulated switchgear 9A that can handle pit wiring. The cable wiring method of pulling the cable 96 from the upper side of the gas-insulated switchgear, as in the case of the gas-insulated switchgear 9B, may be hereinafter referred to as rack wiring.

[0017]

The above-described gas-insulated switchgear according to the prior art can be used for power receiving and transforming equipment connected to a high-voltage or extra-high-voltage power distribution system, which will be described below. The problem remains. First, in the gas-insulated switchgear 9, the operating device of the vacuum circuit breaker 8 used has a structure in which the mass of the movable contactor and the movable portion on which the movable contactor is supported is taken into consideration as described above. Is equipped with. Therefore, the vacuum circuit breaker 8 is not allowed to reverse the vertical positional relationship between the movable contact and the fixed contact. that is,
Reversing the vertical positional relationship reverses the relationship between the mass of all movable parts including the movable contactor, the moving speed value of the movable contactor, and the pressing force value of the movable contactor with respect to the fixed contactor. Therefore, the moving speed value and the pressing force value of the movable contact cannot hold the predetermined values,
As a result, it becomes impossible for the vacuum circuit breaker 8 to exhibit a predetermined performance. Therefore, according to what has been described with reference to FIGS. 4 and 6 for the gas insulated switchgear 9A, 9B, the wiring method of the cable 96 is changed to both the pit wiring and the rack wiring by displacing the sealed container 4 up and down. Correspondence cannot be adopted in the gas insulated switchgear 9. The gas-insulated switchgear 9 comprises a vacuum circuit breaker 8, which is
As described above, since the contacts 83, 84 are installed at the relational positions that are asymmetric with respect to the center line of the attachment of the airtight flange 82, it is necessary to make the wiring method of the cable 96 compatible with both wiring methods. This is because the breaker 8 will be displaced up and down.

That is, the gas-insulated switchgear based on the gas-insulated switchgear 9 and adapted for rack wiring is as follows:
Since it is necessary to attach the vacuum circuit breaker 8 to the sealed container 4 in the same posture as when the pits are wired, it is indispensable to add a connection box for connecting the cable 96 to the upper part thereof. FIG. 7 is a vertical cross-sectional view showing a main part of a conventional gas-insulated switchgear including a connection box together with a cable. 7, the same parts as those of the conventional gas-insulated switchgear shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG. 7, about the code | symbol attached | subjected in FIG. 3, only the typical code | symbol was described.

In FIG. 7, 9C is provided with a connection box 79 in addition to the conventional gas-insulated switchgear 9 shown in FIG. 3, and the mounting direction of the cable terminator 61 is inverted upside down. Further, as shown in FIG. 7, the gas insulated switchgear in which the current transformer 55, the cable bracket 62 and the like are mounted in the connection box 79. The gas-insulated switchgear 9C has a configuration in which a connection box 79 is added, and therefore can be adapted to rack wiring. However, since the connection box 79 is additionally installed, it is larger and more expensive than the gas-insulated switchgear 9.

Next, the gas-insulated switchgear such as the gas-insulated switchgear 9A, 9B is provided with a structure in which the upper and lower partial containers can be replaced and attached to the partial container located in the central portion. The case will be described. In the gas-insulated switchgear having this configuration, in the case of a gas-insulated switchgear which does not have the vacuum circuit breaker 8 like the gas-insulated switchgear 9A, 9B, both the pit wiring and the rack wiring are provided as described above. It is possible to cope with the above by using the same main parts. However, FIG.
In the gas-insulated switchgear 9D having a configuration in which the upper and lower partial containers each have the vacuum circuit breaker 8 having the single-line connection diagram shown in FIG. Even if the structure is provided, the vacuum circuit breaker 8 cannot be displaced up and down, so it is not possible to support both wiring methods by replacing the partial container. In order to make this gas-insulated switchgear 9D compatible with rack wiring, some kind of structural consideration such as the same configuration as in the case of the gas-insulated switchgear 9C is required. It is larger and more expensive than.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide an entire sealed container containing a vacuum circuit breaker or upper and lower parts containing a vacuum circuit breaker. It is an object of the present invention to provide a gas-insulated switchgear provided with a vacuum circuit breaker that enables the configuration of a container to be changed upside down.

[0022]

According to the present invention, the above-mentioned objects are as follows: 1) A sealed container filled with an electrically insulating gas, and a through hole formed in a container wall of the sealed container are loaded into the sealed container, A vacuum circuit breaker mounted on the container wall of the hermetically sealed container by an airtight flange, a fixed side conductor that is detachably coupled to each contact of the vacuum circuit breaker and is installed in the hermetically sealed container, and a fixed side conductor. A vacuum circuit breaker is provided with a housing for connecting a cable electrically connected directly or through an appropriate electric device, and a cable connector mounted on the outer surface side of the container wall of the sealed container. A circuit breaker main body having a movable contact and a fixed contact built into the housing, and a pair of contacts installed on the outer wall of the housing and electrically coupled to the movable contact and the fixed contact. , Formed on the housing and sealed In a gas-insulated switchgear having an airtight flange for mounting on the container wall of a container, the vacuum circuit breaker has contacts that are paired with each other vertically symmetrical with respect to the centerline of the airtight flange. It is achieved by adopting a configuration in which it is installed at the position of the relation.

[0023]

According to the present invention, in a gas-insulated switchgear equipped with a vacuum circuit breaker, (1) the vacuum circuit breaker has a pair of contacts which are vertically symmetrical with respect to the center line of the airtight flange. With the configuration in which the vacuum circuit breaker and the hermetically sealed container are installed at the relevant positions, even if the hermetically sealed container and the electric equipment installed in the hermetically sealed container are vertically displaced, Since the mounting positions of the contact elements are vertically displaced from each other, it is possible to connect the vacuum circuit breakers to each other without vertically displacing them. Therefore, while maintaining the vertical relationship of the vacuum circuit breaker,
It is possible to move the sealed container upside down.

[0024]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to an embodiment of the present invention together with a cable. In FIG. 1, the same parts as those of the conventional gas insulated switchgear shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. It should be noted that, in FIG. 1, as for the reference numerals given in FIG. 3, only representative reference numerals are shown.

In FIG. 1, reference numeral 1 denotes a gas insulated switchgear 9 according to the conventional example shown in FIG. 3, in which a vacuum circuit breaker 2 and a hermetically sealed container 3 are used instead of the vacuum circuit breaker 8 and the hermetically sealed container 4. This is a gas-insulated switchgear with a structure corresponding to pit wiring. The vacuum circuit breaker 2 uses the airtight flange 21 instead of the airtight flange 82 in the vacuum circuit breaker 8 included in the conventional gas insulated switchgear 9. The airtight flange 21 has an airtight flange 21.
Is formed with a plurality of through holes (not shown) for mounting screws (not shown) that fasten the above to the container wall of the sealed container 3. Then, as one of the characteristic configurations according to the present invention, the plurality of through-holes have the center of the center pitch interval dimension 2C as the center pitch interval dimension of each of the contactor 83 and the contactor 84. It is formed to match the center of 2B. Then, with respect to the plane including the center line 2A connecting the center of the pitch interval dimension 2B and the center of the pitch interval dimension 2C, each of the plurality of through holes is formed at positions symmetrical to each other.

The hermetically sealed container 3 is different from the hermetically sealed container 4 provided in the conventional gas insulated switchgear 9 in that the hermetically sealed flange 21 is formed around the through hole 31 for inserting the vacuum circuit breaker 2. It has a bottomed screw hole (not shown) formed at a position corresponding to the through hole. Then, the plurality of bottomed screw holes have one of the characteristic configurations according to the present invention, in which the center of the pitch interval dimension 3C is the pitch of the center of each of the fixed side member 73 and the fixed side member 74. It is formed so as to match the center of the space dimension 3B.

Since the embodiment shown in FIG. 1 has the above-mentioned configuration, the equipment contained in the sealed container 3 or attached to the container wall of the sealed container 3 except for the vacuum circuit breaker 2 is used. It is possible to obtain the gas-insulated switchgear shown in FIG. 2 corresponding to the rack wiring by transferring the sealed container 3 up and down while storing it in the sealed container 3 or while keeping it attached.

FIG. 2 is a vertical cross-sectional view of the gas-insulated switchgear shown in FIG. 1 showing a main part of the gas-insulated switchgear obtained by vertically displacing a sealed container together with a cable. 2, the same parts as those of the gas insulated switchgear according to the embodiment of the present invention shown in FIG. 1 and the conventional gas insulated switchgear shown in FIG.
The description is omitted. In addition, in FIG. 2, only the typical reference numerals are shown for the reference numerals given in FIGS. 1 and 3.

In FIG. 2, reference numeral 1A denotes a gas-insulated switchgear 1 according to the present invention having a structure corresponding to the pit wiring shown in FIG. 1, and is housed inside a hermetically sealed container 3 except for a vacuum circuit breaker 2. Stored in the container 3 of the device that is installed or attached to the container wall of the container 3;
Alternatively, it is a gas-insulated switchgear corresponding to rack wiring, which is obtained by vertically displacing the hermetically sealed container 3 and installing it on the base 97 while being attached. Gas insulated switchgear 1
In the case of A, the vacuum circuit breaker 2 has the through hole of the airtight flange 21 of the vacuum circuit breaker 2 and the bottomed screw hole formed around the through hole 31 of the hermetic container 3 at the above positions. By being formed, the vacuum circuit breaker 2 can be mounted in the hermetically sealed container 3 in the same posture as that of the gas insulated switchgear 1 without being vertically displaced. As a result, the gas insulated switchgear 1A does not require the connection box 79, unlike the conventional gas insulated switchgear 9C shown in FIG. 7, while supporting the rack wiring. Further, the mounting position of the bushing 521 for the grounding switch 52 can also be a position in which the mounting position in the gas-insulated switchgear 1 is vertically displaced. Moreover, the gas-insulated switchgear 1
A can be manufactured using the same parts as the gas insulated switchgear 1.

In the above description of the embodiments, the gas-insulated switchgear has been described as having a sealed container having the same structure as the gas-insulated switchgear of the conventional example shown in FIG. The present invention is not limited to this, and may be, for example, a gas-insulated switchgear including a hermetically sealed container having a configuration including a plurality of partial containers, similar to the conventional gas-insulated switchgear shown in FIG. 4 having a hermetically sealed container 4A. It is a thing.

[0031]

According to the present invention, the following effects can be obtained by adopting the structure described in the section of the means for solving the above problems. It is possible to configure a gas-insulated switchgear that has a vacuum circuit breaker and is compatible with rack wiring without installing a connection box. As a result, the gas insulated switchgear can be downsized. Further, the gas insulated switchgear capable of handling pit wiring having a vacuum circuit breaker and the gas insulated switchgear capable of handling rack wiring having a vacuum circuit breaker can be configured using the same main parts. As a result, standardization of parts may be possible, and the manufacturing cost of the gas-insulated switchgear can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to an embodiment of the present invention together with a cable.

FIG. 2 is a vertical cross-sectional view of the gas-insulated switchgear shown in FIG. 1 showing a main part of the gas-insulated switchgear obtained by vertically displacing a sealed container together with a cable.

FIG. 3 is a longitudinal sectional view showing a main part of a conventional gas-insulated switchgear together with a cable.

FIG. 4 is a vertical cross-sectional view showing a main part of a different gas insulated switchgear according to a conventional example together with a cable.

5 is a single wire connection diagram of the gas insulated switchgear shown in FIG.

FIG. 6 is a vertical cross-sectional view showing a main part of a gas-insulated switchgear corresponding to a cable wiring method in which a cable is pulled in from above by using the same main parts as the gas-insulated switchgear shown in FIG.

FIG. 7 is a longitudinal sectional view showing a main part of a conventional gas-insulated switchgear provided with a junction box together with a cable.

FIG. 8 is a single wire connection diagram of a gas-insulated switchgear in which a vacuum circuit breaker is added to the gas-insulated switchgear shown in FIG.

[Explanation of symbols]

 1 Gas Insulation Switchgear 2 Vacuum Circuit Breaker 21 Airtight Flange 2A Centerline 2B Pitch Interval Dimension 2C Pitch Interval Dimension 3 Sealed Container 3B Pitch Interval Dimension 3C Pitch Interval Dimension 73 Fixed Side Member 74 Fixed Side Member 83 Contactor 84 Contactor

Claims (1)

[Claims] 1. A sealed container filled with an electrically insulating gas,
A vacuum circuit breaker, which is loaded into the hermetic container through a through hole formed in the container wall of the hermetic container and is attached to the container wall of the hermetic container by an airtight flange, and detachably coupled to each contact of the vacuum circuit breaker. A fixed-side conductor installed in the sealed container and a cable electrically connected to the fixed-side conductor directly or through an appropriate electric device are connected and mounted on the container wall of the sealed container. The vacuum circuit breaker is provided with a cable connection body,
A circuit breaker main body having a movable contact and a fixed contact, a pair of contacts installed on the outer wall of the housing and electrically coupled to the movable contact and the fixed contact, and forming a pair with each other. ， In a gas-insulated switchgear having an airtight flange for mounting on the container wall of a hermetically sealed container, the vacuum circuit breaker has pairs of contacts, which are vertically symmetrical with respect to the centerline of the airtight flange. The gas-insulated switchgear is characterized in that it is installed in a position where