JPH0624408B2 - Gas insulated switchgear - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear installed in an electric station such as a substation.

2. Description of the Related Art Conventionally widely used gas-insulated switchgear is a circuit breaker,
The necessary equipment, such as the grounding device, the current transformer, the branch conductor used to connect the circuit breaker to other equipment (for example, the busbar), is housed in individual metal containers filled with SF6 gas,
The predetermined metal containers are connected to each other via an insulating spacer. However, such a structure has a drawback in that a large number of containers are combined in a complicated manner, the structure is complicated, the device becomes large, and a large installation space is required. Therefore, various types of improved gas-insulated switchgear have recently been proposed for the purpose of simplifying the structure by housing a plurality of devices in a common container. As an improved gas-insulated switchgear of the above, a main unit is configured by accommodating a circuit breaker and a device connected to the circuit breaker, which are required when the switching circuit has any structure, in a common outer shell container, The main unit requires another unit such as a busbar unit in which a busbar and a busbar-side disconnector are housed in a common container, or a cable head unit in which a trackside disconnector and a cable head are housed in a common container. There is a structure to connect according to. With this configuration, it is possible to easily configure a gas-insulated switchgear with various circuit configurations centering on the main unit, and to reduce the installation area compared to the conventional gas-insulated switchgear. However, in this type of conventionally proposed device, the circuit breaker and other devices are housed side by side in the outer shell container of the main unit, so that the axial dimension of the outer shell container becomes significantly longer, In many cases, the size of the outer shell container exceeds the size that can be processed by a normal machine tool. Therefore, it is necessary to manufacture a special machine tool, which is not only troublesome to manufacture, but also has a drawback in that there is a limit to downsizing of the device.

OBJECT OF THE INVENTION An object of the present invention is to provide an improved gas-insulated switchgear capable of reducing the axial dimension of an outer shell container that houses a circuit breaker together with other devices connected to the circuit breaker. To provide.

The gas insulated switchgear to which the invention of the present application is directed is a position in which a breaker is housed in a tubular circuit breaker container and one terminal and the other terminal are spaced apart in the axial direction of the circuit breaker container. The circuit breaker and the current transformer fitted to the current transformer conductor are provided for three phases. The three-phase circuit breaker and the current transformer are collectively housed in a cylindrical outer shell container, and one end of the current transformer conductor of each phase is connected to one terminal of the circuit breaker of each phase. A device connection opening is provided on the side wall of the outer shell container, and the device in the outer shell container is connected to another device through the opening.

According to a first invention of the present application, in a gas-insulated switchgear of this type, the circuit breaker and the current transformer conductor of each of the phases are perpendicular to an axis of the outer shell container in a state of being parallel to the axis. The feature is that they are arranged side by side.

The circuit breaker may be of any type as long as it houses a circuit breaker including a movable contact, a fixed contact and an arc extinguishing mechanism in a tubular circuit breaker container. For example, a puffer-type gas circuit breaker that extinguishes an arc by extinguishing an arc with a puffer cylinder, or an arc-rotating gas circuit breaker that extinguishes the arc by magnetic force generated by an arc current. Etc. can be used.

The outer shell container only needs to have a substantially cylindrical shape as a whole, and the number of device connection openings provided on the side wall thereof is arbitrary.

Other devices connected through the device connection opening of the outer shell container together with the circuit breaker and the current transformer have a predetermined switching circuit (depending on the configuration of the electric station and the location where the gas insulated switchgear is arranged). Is another device required to configure the. For example, in a gas-insulated switchgear (bustie unit) used for connecting busbars to each other, a busbar unit in which a busbar and a busbar-side disconnector provided between the busbar and a circuit breaker are housed in a container Is connected to the device in the outer shell container through the device connection opening of the outer shell container. In a gas-insulated switchgear (feeder unit) used for connecting a feeder to a busbar, the busbar unit, a cable head, and a line-side disconnector arranged between the cable head and the circuit breaker are placed in a container. The accommodated cable head unit is connected to the device in the outer shell container through the device connection opening.

In the second invention of the present application, in addition to the configuration of the first invention, one end is connected to the other terminal of the circuit breaker of each phase and the other end extends to the other terminal side of the circuit breaker of each phase. Branch conductors connected to other devices are provided for each phase, and the branch conductors for each phase are arranged in the outer shell container in parallel with the breakers for each phase on the side opposite to the current transformer. . Further, a first and a second circuit breaker inspection grounding device are provided between the other end of the branch conductor of each phase and the ground potential portion and between one end of the current transformer conductor of each phase and the ground potential portion, respectively. Has been.

In the third invention of the present application, the outer shell container is oriented in the vertical direction and is supported on the operation device box. The circuit breaker and the grounding devices for inspecting the first and second circuit breakers are supported by a common support plate arranged at the bottom of the outer shell container, and the operating shafts of the circuit breaker and each grounding device are the operating device. It is connected to an operating device located in the box. Further, the opening at the upper end of the outer shell container is closed by a removable cover plate, and the inside of the outer shell container can be inspected by removing the cover plate.

As described above, according to the present invention, since the circuit breaker and the current transformer are arranged in parallel in the outer shell container, the outer shell container has an axial dimension capable of accommodating the circuit breaker. If you have. Therefore, the axial dimension of the outer shell container can be shortened, and the outer shell container can be downsized. Further, since the axial dimension of the outer shell container is shortened, the outer shell container can be manufactured using a normal machine tool, and the outer shell container can be easily manufactured.

In particular, according to the second invention of the present application, since the first and second circuit breaker inspection grounding devices are both arranged on one end side of the outer shell container, a space is secured on the other end side of the outer shell container. Therefore, the circuit breaker can be easily inspected from the other end side of the outer shell container. Further, according to the second invention of the present application, the first invention
Since the second earthing device for inspecting circuit breaker is arranged on the same side, both the earthing devices can be easily operated in an interlocked manner, and the operation mechanism of the earthing device can be simplified.

Further, according to the third invention of the present application, since the outer shell container is supported on the operating device box and the circuit breakers and the operating devices of the respective grounding devices are housed in the same operating device box, the operation of the circuit breaker and the grounding device is performed. The inspection and maintenance of the vessel can be facilitated. Further, since the circuit breaker and each grounding device are supported by the common supporting plate, the mounting structure of the equipment in the outer shell container can be simplified and the structure of the device can be simplified. Further, since the upper end of the outer shell container is closed by the removable lid plate, the breaker can be easily inspected by using the wide space above the outer shell container by removing the lid plate. Furthermore,
Since it is possible to increase the height of the operating device box by reducing the axial dimension of the outer shell container, it is possible for a person to enter the operating device box to perform work, and to maintain the operating devices. The inspection can be facilitated.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a first embodiment in which the present invention is applied to a feeder unit arranged between a bus bar and a feeder, and show an electrical configuration of each phase of the same embodiment. A single line connection diagram is shown in FIG.

In FIG. 7, BS1 and BS2 are first and second busbars, DS11 and DS12 are first and second busbar-side disconnectors, respectively, and the first busbar BS1 and the first busbar-side disconnector DS11 are common. The first busbar unit is configured by accommodating the second busbar BS2 and the second busbar-side disconnector DS12 in the common container, and thus the second busbar unit is configured. . CB is circuit breaker, E
S11 and ES12 are first and second grounding devices for inspecting circuit breakers, and CTa to CTc are current transformers fitted to the current transformer conductor L. These circuit breakers CB and both grounding devices ES1, E
The S2 and the current transformers CTa to CTc are housed in the outer shell container to form a main unit. DS2 is a line side disconnector,
CH is a cable head, ES2 is a cable head grounding device, and LA is a lightning arrester. The cable head CH, the grounding device ES2, and the lightning arrester LA are housed in a common container to form a cable head unit. Further, PT is an instrument transformer which is provided on the cable head unit side and is connected to a conductor connecting between the disconnector DS2 and the current transformer conductor L.

1 is a top view, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a top view showing the arrangement of equipment in the outer shell container.
In these figures, 1 is an operation unit, 2 is a main unit arranged on the operation unit 1, and 3A and 3B are first arranged vertically on the front side of the main unit 2, respectively.
The second busbar unit 4 and the second busbar unit 4 are cable head units arranged on the rear side of the main unit 2, and these constitute one gas-insulated switchgear GIS. In this embodiment, as shown in FIG. 1, two gas-insulated switchgears GIS having the same structure are arranged side by side in the lateral direction,
Busses BS1 and BS2 of both gas-insulated switchgear
Comrades are connected to each other.

The operation unit 1 is provided with an operation unit box 101 which is formed in a rectangular parallelepiped shape and whose longitudinal direction is aligned with the front-back direction of the apparatus and which is arranged on the installation base 5. The operation unit unit 101 has a front surface at the time of inspection. An inspection door 102 that is opened is provided. An operation panel 103 having push buttons for operation and monitoring equipment attached thereto is arranged at a front end of the operation device 101, and an operation device support frame 104 is arranged behind the operation device 103. On the frame 104, the circuit breaker operating device 1
05 and the grounding device operating devices 106 and 107 are supported, and a cylinder 108 for supplying compressed air to an air cylinder that drives the operating device is disposed below the frame 104.

The main unit 2 is provided with a cylindrical outer shell container 201, and the outer shell container 201 has its axis oriented in the up-down direction.
01 is arranged on the upper surface near the rear end. Outer shell container 2
The lower opening of 01 is airtightly closed by a device supporting plate 202 which also serves as a bottom plate, and the upper opening is removable lid plate 20.
It is hermetically closed by 3. The opening 1 is provided at a position facing the device support plate 202 on the upper surface of the rear end of the controller box 101.
09 is provided, and the device in the outer shell container 2 is connected to the operating device in the operating device box 101 through this opening. First and second device connection openings 201a and 201b are provided on the front side of the side wall of the outer shell container 201 at intervals in the vertical direction, and the third device is provided on the rear side of the side wall of the outer container 201. A connection opening 201c is provided.
Each device connection opening is formed by welding a short pipe to the periphery of a hole penetrating the side wall of the outer shell container, and a mounting flange f is provided at the outer end of each short pipe.

The device support plate 202 which also serves as the bottom plate of the outer shell container is the operating device box 1
01 is arranged so as to close the opening 109 and is fixed to the operation device box, and the support leg 204 is provided on the device support plate 202.
The three-phase circuit breaker CB is mounted on the circuit breaker mounting plate 205 fixed via the circuit breaker CB. Each circuit breaker CB has a movable contactor, a fixed contactor and an appropriate arc extinguishing mechanism housed in a cylindrical circuit breaker container 206. The circuit breaker CB has a side surface near the upper end and a side surface near the lower end of the cylindrical container 206 respectively. A fixed-side terminal 207 connected to the fixed contact and a movable-side terminal 208 connected to the movable contact are provided. As shown in FIG.
The phase circuit breakers CB are arranged so as to be positioned at the vertices of an isosceles triangle with their axes oriented in the vertical direction, and their respective lower ends are mounted on the circuit breaker mounting plate 205. Operation shaft 209 for operating the movable contactor of each breaker CB
Is guided downward through the mounting plate 205, and the operating shaft 209 of the three-phase circuit breaker mounted on the mounting plate 205 is 3
They are connected to each other by the phase connecting plate 210. A common operation shaft 211 is attached to the central portion of the three-phase connecting plate 210, and the operation shaft 211 penetrates the thrust bearing 212 attached to the device attachment plate 202 in an airtight and slidable manner in the operator box 101. Have been derived to. The common operation shaft 211 led out into the operation device box 101 is connected to the drive shaft 105a of the operation device 105 via the lever 239, and the cylinder 108
When the drive shaft 105a is driven in the left-right direction in FIG. 2 by the air cylinder driven by the compressed air inside, the common operating shaft 211 is driven downward and upward, and the three-phase circuit breaker CB is operated collectively. It has become so. The second
The figure shows a state in which the circuit breaker CB of each phase is closed, and when the drive shaft 105a is driven leftward from this state, the circuit breaker CB of each phase opens.

The conductor 214 connected to the first busbar unit is connected to the fixed-side terminal 207 provided on the front side upper portion of the circuit breaker CB of each phase via the connection conductor 213, and the conductor connection provided on the conductor 214 is connected. The upper end of a branch conductor 215 arranged parallel to the circuit breaker is connected to the front side of the circuit breaker.
The lower end of the current transformer conductor 217 of each phase, which is arranged in parallel with the circuit breaker on the side opposite to the branch conductor, is connected to the movable-side terminal 208 of the circuit breaker CB of each phase via the connection conductor 218. The current transformer conductor 217 has three current transformers CTa to CT for each phase.
c is fitted.

At the lower end of the branch conductor 215, the conductor 220 connected to the second busbar unit 3B and the fixed side unit 22 of the grounding device.
1 is connected. A movable side unit 223 of the grounding device is mounted on the device support plate 202 via a frame 222, and the fixed side unit 221 and the movable side unit 2 are attached.
23 constitutes a first circuit breaker inspection grounding device ES11. Each movable unit 223 has a rod-shaped movable contact 224 that comes in contact with and separates from a fixed contact provided on the fixed unit.
The movable contactor 224 of the grounding device ES11 of each phase is connected to a common rotation operation shaft 226 via a lever 225. The operation shaft 226 penetrates the side wall of the outer shell container rotatably and rotatably and is led out to the outside, and further, by an appropriate connection mechanism 227 such as a link mechanism, the operator box 101
It is connected to the operation device 106 for the grounding device. The operation unit 106 is adapted to simultaneously open and close the three-phase grounding device ES11.

A fixed unit 231 of the grounding device is connected to the lower end of the current transformer conductor 217. A movable unit 2 of the grounding device is mounted on the device support plate 202 via a frame 232.
33 is mounted, and the fixed side unit 231 and the movable side unit 233 connect the second circuit breaker inspection grounding device ES12.
Is configured. Each movable unit 233 is provided with a rod-shaped movable contact 234 that comes in contact with and separates from a fixed contact provided with the fixed unit 231. The movable contact 234 of the grounding device ES12 of each phase is common via a lever 235. It is connected to the rotation operation shaft 236. The operation shaft 236 is led out to the outside by airtightly and rotatably penetrating the side wall of the outer shell container, and further connected to the grounding device operation device 107 in the operation device box 101 by an appropriate connection mechanism 237 such as a link mechanism. ing. A three-phase grounding device ES12 is operated by the operation unit 107.
Are opened and closed at the same time.

In addition, in FIG. 2, in order to prevent the figure from being complicated, only the circuit breaker CB, the branch conductor 215, and the current transformer CT for one phase are shown, and the circuit breaker, the branch conductor, and the transformer of the other phase are shown. The sink is not shown.

As shown in FIG. 1, the container 300 of the first busbar unit 3A includes a first pipe 301 extending horizontally in the front-rear direction and a horizontal pipe horizontally arranged in a right angle with respect to the first pipe 301. A three-phase bus bar BS is formed in the second tube 302 of the container 300, which is formed in the shape of a cross tube including the extending second tube 302.
The busbar conductors 303u to 303w forming part 1 are arranged in parallel. The three-phase bus bar conductors 303u to 303w are supported by an insulating spacer 304 arranged so as to hermetically close one end of the second tube 302. Also container 300
One end of the first tube 301 is airtightly connected to the first equipment connection opening 201a of the outer shell container 201 via an insulating spacer 305, and is embedded in the insulating spacer 305 in an airtight manner. The fixed contactor 307 of the first busbar-side disconnector DS11 is connected to the end of the conductor 306 located inside the container 300. The busbar conductors 303u to 303w are connected to a movable contactor 308 which constitutes a disconnecting switch together with the fixed contactor 307, and the operating rod 309 for operating the movable contactor is the other end of the first pipe 301 of the container 300. Is connected to the operation mechanism 310 disposed in the. Operating mechanism 3
The operating shaft 10 is an operating device 3 supported on the side surface of the container 300.
11A, and the operation device 311A is configured to simultaneously open and close the three-phase disconnector DS11. In order to prevent the operating mechanism 310 from disturbing the electric field near the disconnector DS11, an electrostatic shield 312 is provided between the operating mechanism 310 and the disconnector DS11. First of container 300
An opening 313 for work is provided at the other end of the pipe 301, and the opening is airtightly closed by a cover plate 314.

At the end portion of the embedded conductor 306 supported by the insulating spacer 305 of the busbar unit 3A located inside the outer shell container 201, the conductor 21 connected to the fixed side terminal 207 of the circuit breaker is provided.
4 are connected, whereby the fixed-side terminal 207 of the circuit breaker CB of each phase is connected to the busbar conductor of the first busbar unit 3A.

The second busbar unit 3B has exactly the same configuration as the first busbar unit BS1, and the second busbar-side disconnector DS12 is provided by the fixed contactor 307 and the movable contactor 308 in the container 300 of the second busbar unit 3B. Is configured. The operation shaft of the operation mechanism 310 of the second busbar side disconnector DS12 is connected to the operation device 311B attached to the side surface of the container 300 of the second busbar unit. Second busbar unit 3
The container 300 of B is hermetically connected to the second device connecting opening 201b of the outer shell container 201 via the insulating spacer 305, and the end portion of the embedded conductor 306 of the insulating spacer 305 located inside the outer shell container 201. A conductor 220 connected to the branch conductor 215 is connected to.

The container 400 of the cable head unit 4 is made of a tubular body arranged so that its axis is oriented in the vertical direction.
0 is provided with a first device connecting opening 400a on the front side (outer shell container side) and a second device connecting opening 400b at the upper end. Further, work openings 400c and 400d are provided on the side wall on the back side of the container 400 at intervals in the vertical direction.
First device mounting opening 400a and working opening 4
Each of 00c and 400d is made by welding a short pipe to the periphery of the hole provided in the container 400, and a mounting flange f is provided at the end of the short pipe at each opening.

The device connection opening 400a of the container 400 is hermetically connected to the third device connection opening 201c of the outer shell container 201 via the insulating spacer 401, and the three-phase embedded conductor 402 is provided in the insulating spacer 401. It is provided. Embedded conductor 4
02 is connected to the connecting conductor 2 at the end located inside the outer shell container 201.
The upper end of the current transformer conductor 217 is connected via 50. Further, one end of the connection conductor 403 is connected to the end portion of the embedded conductor 402 of each phase located in the container 400, and the fixed contactor 405 of the line side disconnector DS2 is connected to the other end of the connection conductor 403 of each phase. It is connected. Further, a conductor 408 extending in the vertical direction is supported by a frame 406 supported on the side wall of the container 400 via an insulating support 407, and a movable contactor 409 of the disconnector DS2 is connected to the upper end of the conductor 408. The disconnector DS2 of each phase is provided coaxially with the embedded conductor 402 on an extension of the axis of the embedded conductor 402 of the insulating spacer 401. Further, the operating rod 410 of the movable contactor 409 of the three-phase disconnector DS2 is connected to the disconnector operator in the operator box 411 attached to the side surface of the container 400 by the three-phase connecting plate 4.
14 and a connecting mechanism (not shown), so that the three-phase disconnector DS2 can be collectively opened / closed by the operating device.

A fixed contact 412 of the grounding device ES2 is connected to the lower end of the conductor 408. A movable contact 413 of the grounding device ES2 is supported on the frame 406, and the movable contact 413 is connected to the operation box 4 via a connecting mechanism (not shown).
11 is connected to the grounding device operating device, and the three-phase grounding device ES2 is collectively operated by the operating device.

The lower end of the container 400 is hermetically closed by the bottom plate 415,
Three holes 416 for penetrating the bottom plate 415 to connect cables of three phases are formed. And container 40
A cable head CH of three phases is attached from the inside of 0 so as to close these three holes in an airtight manner, and a connector 417 attached to the end of the cable C of the corresponding phase is attached to the cable head CH of each phase. It is connected so that it can be inserted and removed through 416. The lightning arrester LA is arranged beside the cable head CH of each phase, and the non-grounded side terminal of the lightning arrester of each phase is connected to the terminal 418 at the upper end of the cable head CH of the corresponding phase and via the connection conductor 419. It is connected to the conductor 408 of the corresponding phase.

An instrument voltage transformer PT is hermetically connected to the device connection opening 400b at the upper end of the container 400 via an insulating spacer 420, and the terminals of each phase led to the lower end of the transformer PT are the connection conductors. It is connected to 403. Also container 4
The work openings 400c and 400d of No. 00 are hermetically closed by lid plates 421 and 422, respectively.

In this embodiment, the container 400 of the cable head unit 4 is
A box body 423 for covering the cable C rising from the underground cable bit is arranged below, and the container 400 is supported by the box body 423. With this structure, the mechanical strength of the device can be increased. The box body 423 can be omitted.

In assembling the main unit 2 of the gas insulated switchgear described above, first, the device support plate 202 is mounted on the operation device box 101.
And the movable side units 223, 233 of the circuit breaker CB and the grounding devices ES11 and ES12 on the device support plate 202.
After mounting, the branch conductor 215 and the current transformer conductor 217 are connected to the circuit breaker CB, and the current transformers CTa to CTc are mounted. After that, the outer shell container 201 is lifted to lift the device support plate 2
02, and the lower end of the outer shell container 201 is connected and fixed to the device support plate 202. Then, the first and second device connection openings 201a and 201b of the outer shell container 201 are first
And the second busbar units 3A and 3B are connected, and the embedded conductor 306 of the insulating spacer 305 of the busbar units 3A and 3B and the conductors 214 and 220 are connected from the upper end opening of the outer shell container 201. Further, the cable unit 400 is connected to the device mounting opening 201c of the outer shell container 201, and the current transformer conductor 217 is inserted from the upper end opening of the outer shell container 201.
And the insulating spacer 401 are connected. Thereafter, the upper end opening of the outer shell container 201 is airtightly closed by the cover plate 203,
SF6 gas is filled in the container of each unit.

When a plurality of gas-insulated switchgears GIS are installed as shown in FIG. 1, the insulating spacers of the second pipe 302 of the container 300 of the busbar units 3A and 3B of one gas-insulated switchgear GIS are attached. The tube 320 with the end not on the side
Through the insulating spacer 304 of the other gas-insulated switchgear
Connect to. Busbars of adjacent busbar units are connected to each other through the insulating spacer 304.

In the above-mentioned embodiment, the circuit breaker CB and the grounding devices ES11 and ES12 for inspecting the circuit breaker are attached to the device supporting plate 202 which also serves as the bottom plate of the outer shell container through the supporting legs 204 and the frame 232, but these are the devices. It suffices if it is supported by the support plate 202, and for example, as shown in FIG.
B and the movable unit 223 of the grounding device ES11 and ES12
Alternatively, 233 and 233 may be directly attached to the device support plate 202 that also serves as the bottom plate of the outer shell container 201 and the ceiling plate of the crankcase 110. In this example, crankcase 1
10 has an airtight structure, the inside of the crankcase communicates with the inside of the outer shell container 201, and airtightly penetrates the side wall of the crankcase 110, and the circuit breaker CB and the grounding devices ES11, E.
The operation shafts 240 and 241, 242 of S12 are led out to the outside. The operation shaft 240 of the circuit breaker CB is the operation box 10
1 is connected to the circuit breaker operating device 105, and is connected to the grounding device ES.
The operating shafts 241 and 242 of 11 and ES 12 are connected to the grounding device operating device 106.

In each of the above embodiments, the operating shafts of the grounding devices ES11 and ES12 for inspecting circuit breakers are individually connected to the operating device. However, the operating shafts of these grounding devices are connected to the inside of the outer shell container (see FIGS. In the case of FIG. 3) or in the crankcase (No. 4)
(In the case of the figure) Connect both grounding devices so that they are interlocked.
The two operation devices can be opened and closed by one operation shaft, and the one operation shaft is airtightly penetrated through the side wall of the outer shell container or the crankcase to be connected to a common operation device, so that both grounding devices ES11 and ES12 are integrated. It can also be configured to be opened and closed.

In the above embodiment, the voltage transformer PT was connected to the circuit breaker side terminal of the disconnector DS2, but as shown in FIG.
You may make it connect to the line side terminal of S2. A single line connection diagram in this case is shown in FIG. That is, according to the above-described embodiment, the configuration of the unit 4 can be achieved both when the voltage transformer PT is connected to the circuit breaker side of the disconnector DS2 and when it is connected to the line side (cable head side) of the disconnector DS2. No need to change.

FIG. 9 shows another embodiment of the present invention. In this embodiment, the grounding device ES is attached to the mounting plate 205 on which the breaker is mounted.
11 and ES12 movable side units 223 and 233 are attached, and the grounding device frame 22 used in the embodiment of FIG.
2, 232 are omitted. With this structure, the structure of the main unit can be simplified. In this embodiment, the operation axes of the grounding devices ES11 and ES12 are
Through the connecting mechanism 227 that is common to both grounding devices and is provided to penetrate the side wall of the outer shell container 201 in an airtight manner, the controller box 1
01 is connected to a grounding device operating device 106 provided outside, and the grounding devices ES11 and ES12 are simultaneously opened and closed by the operating device.

The voltage transformer PT is not always provided, and the necessity of the voltage transformer PT is determined according to the operating conditions of the user.
Therefore, in the above-described embodiment, the most efficient device arrangement is performed without the voltage transformer, and when the voltage transformer PT is required, the voltage transformer PT is utilized by utilizing the dead space above the cable head unit. It is arranged. A certain space is required above the outer shell container to enable inspection of the circuit breaker, and a certain space is required above the cable head unit at the installation site. Space cannot be lost. Therefore, arranging the voltage transformer, which is not always provided, by utilizing the upper space of this device leads to effective utilization of the spacer and greatly contributes to downsizing of the device.

In the above embodiment, the voltage transformer is arranged above the container 400 of the cable head unit. However, as shown in FIG. 6, the voltage transformer PT is arranged inside the container 400 of the cable head unit 4. You can also In this case as well, it goes without saying that the voltage transformer can be connected to either the circuit breaker side or the line side (cable head side) of the disconnector DS2. In the embodiment shown in FIG. 6, the voltage transformer P
Since the container of T is unnecessary and the insulating spacer 420 is unnecessary, the structure can be simplified.

In the above embodiment, the present invention is applied to the gas-insulated switchgear having the switch circuit having the double busbar structure. However, by omitting one busbar unit, the gas-insulated switchgear having the switch circuit having the single busbar structure is provided. It can also be configured.

In the above description, the present invention is applied to the feeder unit arranged between the busbar and the feeder connected to the busbar, but the present invention is also applied to the bus tie unit used for connecting the busbars to each other. Of course, you can For example, in FIG. 2, the cable head unit 4 is removed to hermetically close the opening 201c, the conductor 214 is removed, and the upper end of the current transformer conductor 217 is connected to the embedded conductor 306 of the insulating spacer 305 of the first busbar unit 3A. By doing so, it is possible to configure a bus tie unit that connects the bus lines BS1 and BS2. That is, the feeder unit and the bus tie unit can be constructed only by changing the arrangement of the conductors in the outer shell container.

If the upper end of the outer shell container 201 can be opened as in each of the above-described embodiments, inspection of the circuit breaker CB can be facilitated.

Further, by arranging the circuit breaker CB, the current transformer conductor 217, and the branch conductor 215 in parallel, the height of the outer shell container 210 can be reduced, and therefore the height of the operation device box 101 can be increased. Therefore, a worker can enter the operation device box 101, and maintenance work can be facilitated.

When the operation shaft of the circuit breaker is led out to the outside of the outer shell container by the linear sliding system as in the above-mentioned embodiment, the operation shaft lead-out portion is compared to the case where the rotary operation shaft is led out to the outside in an airtight manner. The structure of can be simplified.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of the present invention, and FIG.
II-II line expanded sectional view of the figure, FIG. 3 is the top view which showed the apparatus cross section of the apparatus arrangement in the outer shell container of the same Example, and FIG. 4 is the principal part of other Examples of this invention. 5 is a sectional view showing a modified example of the cable head unit, and FIG. 7 is a single line showing the electrical configuration of the embodiment shown in FIGS. 1 to 3. Wiring diagram, FIG. 8 is a single line wiring diagram showing the electrical construction of the embodiment of FIG. 5, and FIG. 9 is a sectional view showing the main part of another embodiment of the present invention. 1 ... operation unit, 101 ... operation box, 105 ...
... Circuit breaker operating device, 106, 107 ... Grounding device operating device, 2 ... Main unit, 201 ... Outer shell container, 202 ...
... Equipment support plate, 215 ... Branch conductor, 217 ... Current transformer conductor, CB ... Circuit breaker, ES11 and ES12 ... First and second circuit breaker inspection grounding device, 3A and 3B ... First And the second busbar unit, BS1, BS2 ... Busbar, DS
11 and DS12 ...... first and second busbar-side disconnectors, 4 ...
Cable head unit, CH ... Cable head, L
A: Lightning arrester, DS2: Line side disconnector.

Claims (4)

[Claims] 1. A circuit breaker in which a circuit breaker is housed in a cylindrical circuit breaker container and one terminal and the other terminal are led out from positions spaced apart in the axial direction of the circuit breaker container. A current transformer fitted to a current transformer conductor is provided for three phases, and the circuit breaker and the current transformer for the three phases are collectively housed in a cylindrical outer shell container, and the current of each phase is transformed. A gas-insulated switch, in which one end of a container conductor is connected to one terminal of a circuit breaker for each phase, and a device in the outer shell container is connected to another device through a device connection opening provided in the side wall of the outer shell container In the device, the circuit breaker and the current transformer conductor of each phase are arranged side by side in a direction perpendicular to the axis of the outer shell container in a state where the axes are parallel to the axis of the outer shell container. Switchgear. 2. A circuit breaker in which a circuit breaker is housed in a cylindrical circuit breaker container and one terminal and the other terminal are led out from positions spaced apart in the axial direction of the circuit breaker container. A current transformer fitted to a current transformer conductor is provided for three phases, and the circuit breaker and the current transformer for the three phases are collectively housed in a cylindrical outer shell container, and the current of each phase is transformed. Gas insulation in which one end of a container conductor is connected to one terminal of a circuit breaker for each phase, and a device in the outer shell container is connected to another device through a device connection opening provided in a side wall in the outer shell container In the switchgear, the circuit breaker and the current transformer conductor of each phase are arranged side by side in a direction perpendicular to the axis of the outer shell container in a state where the axes of the circuit breaker and the current transformer conductor are parallel to each other. Each branch conductor has one end connected to the other terminal and the other end extending to the other terminal side of the circuit breaker of each phase and connected to another device. The branch conductors of each phase are arranged in parallel in the circuit breaker of each phase on the side opposite to the current transformer and arranged in the outer shell container, and grounded to the other end of the branch conductor of each phase. A gas-insulated switchgear, wherein first and second grounding devices for inspecting circuit breakers are provided between the potential part and between one end of the current transformer conductor of each phase and the ground potential part, respectively. . 3. A circuit breaker in which a circuit breaker is housed in a tubular circuit breaker container, and one terminal and the other terminal are led out from positions spaced apart in the axial direction of the circuit breaker container. A current transformer fitted to a current transformer conductor is provided for three phases, and the three-phase circuit breaker and the current transformer are collectively housed in a cylindrical outer shell container, and the current transformer of each phase is provided. A gas-insulated switchgear in which one end of a conductor is connected to one terminal of a circuit breaker for each phase and a device in the outer shell container is connected to another device through a device connection opening provided in a side wall of the outer shell container. In the above, the outer shell container is supported on the operating device box with the axis lined up and down, and the circuit breaker and current transformer conductor of each phase have their respective axis lines parallel to the axis line of the outer shell container. In this state, one end is connected to the other terminal of the circuit breaker for each phase and the other end is arranged for each of the other ends. A branch conductor extending to the other terminal side of the circuit breaker and connected to other equipment is provided for each phase, and the branch conductor of each phase is provided on the side opposite to the current transformer in parallel with the circuit breaker of each phase. They are arranged side by side in the outer shell container, and are arranged between the other end of the branch conductor of each phase and the ground potential part and between the one end of the current transformer conductor of each phase and the ground potential part, respectively. A grounding device for inspecting a circuit breaker is provided, and the circuit breaker and the first and second grounding devices are supported by a common support plate arranged on the bottom side of the outer shell container, An operating shaft of the grounding device is drawn to the outside of the outer shell container and connected to an operating device, and an upper end opening of the outer shell container is closed by a removable cover plate. . 4. The gas-insulated switchgear according to claim 3, wherein the support plate also serves as a bottom plate of the outer shell container.