JPH0655007B2 - Gas insulated switchgear - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas-insulated switchgear installed in an electric station such as a substation.

SUMMARY OF THE INVENTION The present invention relates to a gas insulated switchgear in which a circuit breaker and a circuit breaker inspection grounding device are housed in an outer shell container, and the circuit breaker and the circuit breaker inspection grounding device are supported by a common support base. By doing so, the number of parts is reduced, the structure is simplified, and the assembly is facilitated.

[Prior Art] Conventionally widely used gas insulated switchgear is a circuit breaker,
Necessary equipment such as branch conductors used to connect the grounding device, current transformer, and circuit breaker to other equipment (for example, busbar) are housed in individual metal containers filled with SF ₆ gas, and a predetermined metal is used. The container is 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, recently, an improved gas-insulated switchgear has been proposed which is intended to simplify the structure by accommodating a plurality of devices in a common container. According to this improved gas-insulated switchgear, the number of containers is reduced, the structure is simplified, and the device is downsized, so that the installation space can be saved. Further, since the appearance can be simplified, harmony with the urban environment can be easily achieved.

[Problems to be Solved by the Invention] In the conventionally proposed improved gas-insulated switchgear, the circuit breaker and the grounding device for inspecting the circuit breaker are mounted on separate support bases, so that the number of parts is large. Therefore, there is a problem that the structure becomes complicated and the number of assembling steps increases. Further, since the circuit breaker and the grounding device are supported by different supporting bases, positioning of the circuit breaker and the grounding device is troublesome, and there is a problem that assembly takes time.

An object of the present invention is to provide a gas insulated switchgear that solves the above problems.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment of the present invention, the circuit breaker C is provided in an outer shell container 201 filled with an insulating gas.
B and grounding devices ES11 and E for checking the first and second breakers
The present invention relates to a gas-insulated switchgear in which S12 and three phases are collectively stored.

In the present invention, the outer shell container 201 has an opening that is hermetically closed by the bottom plate 202, and one support pedestal 205 having a size capable of entering and exiting the outer shell container through the opening of the outer shell container is the bottom plate 202. The circuit breaker CB is mounted on the support table. The first and second breaker inspection grounding devices ES11 and ES12 are conductors 215 and 2 respectively connected to one terminal and the other terminal of the circuit breaker, respectively.
The first and second grounding device fixed-side units 221 and 231 attached to 18 and the support base 205 positioned at positions corresponding to the first and second grounding device fixed-side units 221 and 231 respectively. First attached to
And movable units 223 and 233 for the second grounding device
It consists of

In the above configuration, the "bottom plate" is not limited to the plate located at the lower end of the outer shell container. When the outer shell container is arranged with its axis oriented horizontally, the plate that closes one end of the outer shell container in the axial direction is the "bottom plate".

[Operation] As described above, the common support 20 for the circuit breaker and the grounding device is used.
If it is supported by 5, the number of parts can be reduced, so that the structure can be simplified and the reliability can be improved. Moreover, since the number of assembling steps can be reduced, the cost can be reduced.

Further, the fixed side units of the first and second circuit breaker inspection grounding devices are attached to the conductors respectively connected to one and the other terminals of the circuit breaker mounted on the support base as described above, and both grounding devices are mounted on the support base. If the movable side unit is attached, the positioning between the circuit breaker and each grounding device and the positioning between the fixed side unit and the moving side unit of each grounding device are all performed before the outer shell container is attached. Can be done at. Therefore, it is possible to position them easily and to assemble the gas-insulated switchgear easily, and to improve the manufacturing efficiency of the device.

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

FIG. 1 shows a busbar and a feeder (a line connecting a gas-insulated switchgear and another device such as a transformer installed in an electric station or a transmission / distribution line connected to the gas-insulated switchgear).
2 shows an embodiment in which the present invention is applied to a feeder unit arranged between the above and the above.

In FIG. 1, reference numeral 1 is an operating unit formed by accommodating operating devices of a circuit breaker in a container, 2 is a circuit breaker CB, a first circuit breaker inspection grounding device ES11, and a second circuit breaker inspection ground. A main unit 3A in which the device E12 and the current transformer CT are housed in a common outer shell container is a first busbar unit 3A in which a first busbar BS1 and a busbar-side disconnector DS11 are housed in a common container. 3B is a second busbar BS2 and a busbar-side disconnector DS12
Is a cable head unit in which the cable head CH, the line-side disconnector DS2 and the cable head grounding device ES2 are housed in a common container.

Hereinafter, the configurations of these units will be described in order.

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. At a position near the front end of the operation device 101, an operation panel 103 to which push buttons for operation and monitoring devices are attached is arranged, and a circuit breaker operation device box 104 is provided behind the operation panel 103.
Are arranged.

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 vertical direction.
01 is arranged on the upper surface near the rear end. Outer shell container 2
The lower end opening of 01 is airtightly closed by the bottom plate 202,
The upper end opening is hermetically closed by a removable cover plate 203. On the front surface side of the side wall of the outer shell container 201, first and second device connection openings 201a are vertically spaced from each other.
And 201b are provided, and a third device connecting opening 201c is provided on the back surface side of the side wall of the outer shell container 201. Each device connection opening is formed by welding a short pipe to the periphery of the hole provided through the side wall of the outer shell container,
A flange for connecting an insulating spacer is provided at the outer end of each short pipe.

The bottom plate 202 of the outer shell container 201 is fixed to the upper surface of the operating device box 101, and the outer shell container is mounted on the bottom plate 202 via support plates 204, 204 arranged so that the plate surface is orthogonal to the bottom plate 202. 201 through the bottom opening of the container 201
A plate-like support 205 having a size that allows it to come in and out is supported. As shown in FIG. 2, a three-phase circuit breaker CB is mounted on the support base 205. Each circuit breaker CB
Is a cylindrical circuit breaker container 206 in which a movable contactor, a fixed contactor, and an appropriate arc extinguishing mechanism are housed.
A fixed-side terminal 207 connected to the fixed contact and a movable-side terminal 208 connected to the movable contact are provided on the side surfaces near the upper end and the lower end, respectively. As shown in FIG.
The three-phase circuit breaker CB is arranged so as to be positioned at the apex of the isosceles triangle with the axes thereof oriented in the vertical direction, and the lower ends of the three circuit breakers are fixed to the support 205. Third
As also shown in the figure, the operating shaft 209 for operating the movable contactor of each circuit breaker CB penetrates the support 205 and is led out downward, and the operating shaft of the three-phase circuit breaker attached to the support 205. 209 are connected to each other by a three-phase connecting plate 210. A common operation shaft 211 is provided at the center of the three-phase connecting plate 210.
Is attached, and the operation shaft 211 is led out into the operation device box 101 through the thrust bearing 212 attached to the bottom plate 202 in an airtight and slidable manner. The common operation shaft 211 led out into the operation device box 101 is connected to the operation device 104, and the operation device 104 collectively operates the three-phase circuit breaker CB.

Fixed side terminal 207 provided on the upper end of the circuit breaker CB of each phase
Is connected to a conductor 214 connected to the first busbar unit 3A, and a conductor connecting portion provided on the conductor 214 is connected to a branch conductor 21 arranged in front of the circuit breaker in parallel with the circuit breaker.
The upper end of 5 is connected. 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 CT of each phase is fitted in the current transformer conductor 217.

In FIG. 1, the circuit breaker CB, the branch conductor 215 and the current transformer CT are shown only for one phase in order to prevent the figure from becoming complicated, and the circuit breaker, the branch conductor and the transformer of the other phases are shown. The sink is not shown.

As shown in FIG. 3, the fixed side terminal 207 of the circuit breaker CB.
The conductor 220 connected to the second busbar unit 3B and the first fixed unit 221 for the grounding device are connected to the lower end of the branch conductor 215 connected to. Support stand 20
5, the first movable unit 223 for the grounding device is attached to the position corresponding to the fixed unit 221 on the fifth side, and the fixed unit 221 for the first grounding device and the movable unit 223 for the first grounding device make the first unit. The circuit breaker inspection grounding device ES11 of No. 1 is configured. Movable unit 22 for each phase
Reference numeral 3 includes a rod-shaped movable contactor 224 that comes in contact with and separates from a fixed contactor provided in the stationary unit, and a three-phase grounding device ES11.
The movable contacts 224 are connected to each other by a connecting plate 225 (see FIG. 4). The connecting plate 225 is the supporting plate 204.
Is connected to one end of an L-shaped connecting lever 226 pivotally supported by
The other end of the connecting lever has a link 227 and an operating lever 22.
8 is connected to a common operating shaft 229 extending horizontally between the support plates 204, 204. One end of the operating shaft 229 is airtightly penetrated through a lower part of the side wall on the front surface side of the outer shell container 201 to be led out to the outside, and is connected to a grounding device operating device described later.

In addition, the connection conductor 218 connected to the movable side terminal of the circuit breaker CB
A fixed unit 231 for the second grounding device is connected to the. The second movable unit 233 for the grounding device is provided at a position on the support base 205 corresponding to the fixed unit 231.
Is attached, and the fixed unit 231 for the second grounding device is attached.
And the second movable unit 233 for the grounding device
The circuit breaker inspection grounding device ES12 is configured. The movable unit 233 of each phase includes a rod-shaped movable contactor 234 that comes in contact with and separates from the fixed contactor provided in the fixed unit 231. The movable contactor 234 of the three-phase grounding device ES12 also has the above-described first cutoff. Contact 22 of grounding device ES11 for equipment inspection
4, they are connected to each other by a connecting plate 225, and are also connected to the operating shaft 229 via a connecting lever 226, a link 227 and an operating lever 229.

The bottom plate 202 is hermetically penetrated through the bushings 240 and 2
41 are attached for three phases, and conductors 242 and 243 passing through these bushings are electrically connected to the movable contacts of the grounding devices ES11 and ES12 of the corresponding phases, respectively. In addition, the bottom plate 202 is airtightly penetrated to the hooking 2
44 is attached, and the output terminal of the current transformer CT is provided in such a manner that the bushing 244 is hermetically penetrated through the terminal conductor 244.
It is led to the outside through a.

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 303 constituting the No. 1 are arranged in parallel.
The three-phase bus bar conductor 303 is supported by an insulating spacer (not shown) arranged so as to hermetically close the end of the second tube 302. Further, one end of the first tube 301 of the container 300 is connected to the first tube 301 of the outer shell container 201 via an insulating spacer 305.
Of the embedded conductor of each phase, which is air-tightly connected to the device connection opening 201a and is provided so as to penetrate the insulating spacer 305 in an air-tight manner, and the bus conductor 303 of each phase. A bus-side disconnector DS11 is arranged in between.

The conductor 214 connected to the fixed side terminal 207 of the circuit breaker is connected to the end portion of the embedded conductor supported by the insulating spacer 305 of the bus bar unit 3A, which is located in the outer shell container 201, whereby each phase is connected. Fixed side terminal 20 of the circuit breaker CB
7 is connected to the disconnector DS11 of the first busbar unit 3A.

The second busbar unit 3B is constructed in exactly the same manner as the first busbar unit BS1, and the busbar conductor 303 forming the second busbar BS2 in the container 300 of the second busbar unit 3B.
And the bus-side disconnector DS12 are stored. The container 300 of the second busbar unit 3B is hermetically connected to the second device connection opening 201b of the outer shell container 201 via the insulating spacer 305, and is placed inside the outer shell container 201 of the embedded conductor of the insulating spacer 305. The conductor 220 connected to the branch conductor 215 is connected to the positioned end portion.

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 device connection opening 400a on the front side (outer shell container side) and a second device connection opening 400b at the upper end. Further container 400
An opening 400c for work is provided in the lower portion of the side wall on the back side of the. Each of the device mounting opening 400a and the working opening 400c is formed by welding a short pipe around the periphery of the hole provided in the container 400, and a flange is provided at the end of the short pipe constituting each opening. ing.

The device connecting opening 400a of the container 400 is hermetically connected to the third device connecting opening 201c of the outer shell container 201 via the insulating spacer 401, and the insulating spacer 401 is provided with a three-phase embedded conductor. Has been. Insulating spacer 40
The upper end of the current transformer conductor 217 is connected to the end portion of the first embedded conductor located inside the outer shell container 201 via the connection conductor 250. One end of the line-side disconnector DS2 is connected to the end of the embedded conductor of each phase of the insulating spacer 401 located inside the container 400, and the other end of the line-side disconnector DS2 of each phase is connected to the bottom of the container 400. It is connected to a supported cable head CH. A cable head grounding device ES2 and a lightning arrester LA are provided between the other end of the disconnector DS2 and the ground. The working opening 400c is closed airtight by the cover plate 402. The cable head CH of each phase has a connector 403 attached to the end of the cable C of the corresponding phase.
Are connected.

In this embodiment, the container 400 of the cable head unit 4 is
A box body 404 for covering the cable C rising from the underground cable bid is arranged below the box, and the container 400 is supported by the box body 404. With this structure, the mechanical strength of the device can be increased. The box body 404 can be omitted.

A disconnector operating device 6 is attached to a lower portion of the busbar container 300 of the first busbar unit 3A, and the operating device 6 is connected to the movable contacts of the busbar side disconnecting devices DS11 and DS12 via an appropriate connecting mechanism. There is. Further, the grounding device operating device 7 is attached to the lower part of the busbar container 301 of the second busbar unit 3B, and the operating shaft 229 is connected to the operating device 7.
The grounding device ES11 is operated by the operating device 7 via the operating shaft 229.
And ES12 can be operated collectively.

The outer shell container 201 of the main unit 2, the busbar containers 300, and the container 400 are filled with SF6 gas at a predetermined pressure.

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. The device can also be configured.

In the above description, the present invention is applied to the feeder unit arranged between the bus bar and the feeder connected to the bus bar, but the present invention is also applied to the bus tie unit used for connecting the bus lines. Of course, you can
For example, in FIG. 1, 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 of the insulating spacer 305 of the first busbar unit 3A. As a result, 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.

When the circuit breaker CB, the current transformer conductor 217, and the branch conductor 215 are arranged in parallel as in the above-described embodiment, the height of the outer shell container 201 can be reduced, so that the controller box 1
The height of 01 can be increased. Therefore, the operator can enter the operation device box 101, and the maintenance and inspection work can be facilitated.

As in the above-described embodiment, the support 205 is mounted on the bottom plate of the outer shell container 201, the circuit breaker is mounted on the support 205, and the first and second circuit breaker inspection grounding devices E are provided.
When the fixed side units 221 and 231 of S11 and ES12 are attached to the conductors connected to one terminal and the other terminal of the circuit breaker, respectively, and the movable side units 223 and 233 of both grounding devices are attached to the support base, The support 205, the circuit breaker CB, and the grounding device ES are mounted on the bottom plate 202.
11. Assemble the device by assembling the movable side unit and the stationary side unit of ES12 and the operation mechanism of the circuit breaker and the grounding device, and then suspending and covering the outer shell container 201 on the bottom plate 202. You can Therefore, it is not necessary to assemble each part in a narrow space in the outer shell container, and the device can be easily manufactured.

Further, with the above configuration, the positioning between the circuit breaker and each grounding device and the positioning between the fixed side unit and the movable side unit of each grounding device are all performed before the outer shell container is attached. Therefore, it is possible to easily position them and to assemble the gas-insulated switchgear easily, and it is possible to enhance the manufacturing efficiency of the device.

In the above-mentioned embodiment, the outer shell container is arranged with its axis lined in the vertical direction, but the present invention can be similarly applied to the case where the outer shell container is arranged with its axis lined in the horizontal direction. .

[Effects of the Invention] As described above, according to the present invention, the circuit breaker and the grounding device are supported by a common support, so that the number of parts can be reduced, the structure is simplified, and the reliability is improved. You can Moreover, since the number of assembling steps can be reduced, the cost can be reduced. Furthermore, since the fixed side unit of the grounding device was attached to the conductor connected to the circuit breaker, and the movable side unit of the grounding device was attached to the support stand to which the circuit breaker was attached, positioning between the circuit breaker and each grounding device and each grounding All the positioning between the fixed side unit and the movable side unit of the device can be performed before the outer shell container is attached to the bottom plate, and these positioning can be facilitated to facilitate the assembly of the gas insulated switchgear. Therefore, there is an advantage that the manufacturing efficiency of the device can be increased.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a transverse cross-sectional view of the main unit portion of the figure, FIG. 3 is an enlarged cross-sectional view of an essential part of the circuit breaker inspection grounding device shown in FIG. 1 enlarged, and FIG. 4 is a movable side of the circuit breaker inspection grounding device. It is sectional drawing which showed the operating mechanism of a unit roughly. 1 ... Operator unit, 101 ... Operator box, 104 ...
... Circuit breaker controller, 2 ... Main unit, 201 ... Outer shell container, 202 ... Bottom plate, CB ... Circuit breaker, ES11 and E
S12 ... First and second breaker inspection grounding device, 3A and 3B ... First and second busbar units, BS1, BS
2 ... Busbars, DS11 and DS12 ... First and second busbar-side disconnectors, 4 ... Cable head unit, CH ... Cablehead, LA ... Lightning arrester, DS2 ... Line-side disconnectors.

Claims (1)

[Claims] 1. A circuit breaker and three first and second circuit breaker inspection grounding devices for grounding both terminals of the circuit breaker are respectively housed in an outer shell container filled with insulating gas for three phases. In the gas-insulated switchgear, the outer shell container has an opening that is airtightly closed by a bottom plate, and one support pedestal having a size that allows the container to enter and exit through the opening of the outer shell container is the bottom plate. And the circuit breaker is mounted on the support base, and the first and second circuit breaker inspection grounding devices are mounted on conductors respectively connected to one terminal and the other terminal of the circuit breaker. The first and second grounding device fixed side units, and the first and second grounding device fixed side units, which are respectively positioned at positions corresponding to the first and second grounding device fixed side units, and which are attached to the support base. Movable side uni for grounding device Gas insulated switchgear characterized in that it consists of the bets.