JPS61167307A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

[Summary of the Invention] The present invention provides a gas-insulated switchgear in which a circuit breaker and a grounding device for circuit breaker inspection are housed in an outer shell, in which the circuit breaker and the grounding device for circuit breaker inspection are mounted on a common support base. By supporting it, we aim to reduce the number of parts and simplify the structure.

[Prior art] Gas insulated switchgear that has been widely used in the past includes circuit breakers,
Necessary equipment such as grounding equipment, current transformers, and branch conductors used to connect the circuit breaker to other equipment (e.g., bus bar) are housed in individual metal containers filled with SF6 gas.
The configuration was such that predetermined metal containers were interconnected via insulating spacers. However, such a structure has the disadvantage that a large number of containers are combined in a complicated manner, resulting in a complicated structure, and the device becomes large and requires a large amount of installation space. Therefore, recently, an improved gas insulated switchgear has been proposed which is intended to simplify the structure by storing a plurality of i-devices in a common container. According to this improved gas insulated switchgear, the number of containers is reduced, which simplifies the structure, and the device is also compact, so installation space can be saved. Furthermore, since the appearance can be simplified, it is possible to easily harmonize with the urban environment.

[Problems to be Solved by the Invention] In the improved gas-insulated switchgear that has been proposed in the past, the circuit breaker and circuit breaker inspection installation device were each mounted on separate supports, resulting in a reduction in the number of parts. There were problems in that the number of parts increased, the structure became complicated, and the number of assembly steps increased. Furthermore, since the circuit breaker and the grounding device are supported on separate support stands, there is a problem in that it is troublesome to position the circuit breaker and the grounding device, and it takes time and effort to assemble the circuit breaker and the grounding device.

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 one embodiment of the present invention, a circuit breaker CB is installed in an outer shell container 201 filled with an insulating gas.
and the first and second circuit breaker inspection grounding devices ES11 and E
In the gas insulated switchgear which stores three phases of circuit breaker S12 at once, one support stand 205 is supported on the bottom plate of outer shell container 201, and circuit breaker CB, circuit breaker inspection grounding device 1ES11 and It is characterized in that both the ES 12 and the ES 12 are supported on a support stand 205.

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 in the horizontal direction, the plate that closes one end of the outer shell container in the axial direction serves as the above-mentioned "bottom plate."

[Operation of the invention J As described above, the circuit breaker and the grounding device are mounted on the common support stand 20.
5, it is possible to reduce the number of parts, simplifying the structure and increasing reliability. Furthermore, since the number of assembly steps can be reduced, costs can be reduced. Furthermore, by supporting the circuit breaker and the grounding device on a common support base, it is possible to easily position them, making assembly easier and improving the manufacturing efficiency of the device. .

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows busbars and feeders (lines that connect gas-insulated switchgear and other equipment such as transformers installed in electrical stations, or transmission and distribution lines that connect to gas-insulated switchgear).
This figure shows an embodiment in which the present invention is applied to a feeder unit disposed between.

In FIG. 1, reference numeral 1 denotes an operating unit configured by housing the circuit breaker operating devices in a container, 2 indicates a circuit breaker CB, and a grounding device for circuit breaker inspection ES11. 3A is a main unit configured by housing the ES12 and current transformer CT in a common outer shell container, and 3A is a first bus unit in which the first bus BS1 and bus side disconnector D S 11 are housed in a common container. , 3B is a second busbar unit in which the second busbar BS2 and busbar side disconnector [ ) 312 are housed in a common container, 4 is a cable head C
This is a cable head unit in which H, a line-side disconnector DS2, and a cable head grounding device ES2 are housed in a common container.

The configurations of these units will be explained in order below.

The operating device unit 1 includes an operating device box 101 formed in the shape of a rectangular parallelepiped and placed on the installation base 5 with its longitudinal direction aligned with the front-rear direction of the device. An inspection door 102 that can be opened is provided. An operation panel 103 equipped with operating push buttons and monitoring equipment is arranged near the front end of the operation device 101, and a circuit breaker operation 1104 is arranged behind the operation panel 103.

The main unit 2 includes a cylindrical outer shell container 201, and the outer shell container 201 is oriented vertically to the operating device box 1.
It is arranged on the upper surface near the rear end of 01. Outer shell container 2
The lower end opening of 01 is hermetically closed by the bottom plate 202,
The upper end opening is hermetically closed by a removable cover plate 203. First and second device connection openings 201a are vertically spaced apart from each other on the front side of the side wall of the outer shell container 201.
and 201b, and a third device connection opening 201c is provided on the back side of the side wall of the outer shell container 201. Each device connection opening is constructed by welding a short pipe to the periphery of a hole penetrated through the side wall of the outer shell container.
The outer end of each short tube is provided with a flange for connecting an insulating spacer.

A bottom plate 202 of the outer shell container 201 is fixed to the upper surface of the controller box 101, and a plate-shaped support plate 204, 204 is disposed on the bottom plate 202 so that the plate surface is perpendicular to the bottom plate 202. A support stand 205 is supported.As shown in FIG. 2, a three-phase circuit breaker CB is mounted on the support stand 205.

Each circuit breaker CB houses a movable contact, a fixed contact, and an appropriate arc extinguishing mechanism in a cylindrical breaker container 206, and the fixed contact is mounted on the side surface near the upper and lower ends of the cylindrical container 206. A fixed side terminal 207 connected to the movable contact and a movable side terminal 208 connected to the movable contact are provided. As shown in FIG. 2, the three-phase circuit breakers CB are arranged at the vertices of an isosceles triangle with their respective axes facing up and down, and their lower ends are fixed to the support base 205. ing. As shown in FIG. 3, the operation shaft 209 for operating the movable contact of each circuit breaker CB passes through the support base 205 and is led out downward, and the operation shaft 209 for operating the movable contact of each circuit breaker CB passes through the support base 205 and is led out downward. The operating shafts 209 are connected to each other by a three-phase connecting plate 210.

A common operating shaft 211 is attached to the center of the three-phase connecting plate 210, and the operating shaft 211 passes through a thrust bearing 212 attached to the bottom plate 202 in an airtight and slidable manner and is guided into the operating device box 101. has been done. A common operating shaft 211 led out into the operating device box 101 is connected to the operating device 104,
The operating device 104 operates the three-phase circuit breakers CB all at once.

Fixed side terminal 207 provided at the upper end of the circuit breaker CB of each phase
A conductor 214 connected to the first bus unit 3A is connected to the conductor 214, and a branch conductor 21 disposed parallel to the circuit breaker on the front side of the circuit breaker is connected to the conductor connection portion provided on the conductor 214.
The upper ends of 5 are connected. In addition, the lower end of a current transformer conductor 217 for each phase, which is arranged parallel to the circuit breaker on the opposite side of the branch conductor, is connected to the movable side terminal 208 of the circuit breaker CB for each phase via a connecting conductor 218. A current transformer CT for each phase is fitted into the current transformer conductor 217.

In Fig. 1, in order to avoid cluttering the diagram, the circuit breaker CB, branch conductor 215, and current transformer CT are shown for only one phase, and the circuit breakers, branch conductors, and current transformers of other phases are shown. The flow vessel is not shown.

As shown in FIG. 3, a conductor 220 connected to the second bus unit 3B and a fixed unit 221 of the grounding device are connected to the lower end of the branch conductor 215. A movable unit 223 of the grounding device is mounted on the support base 205, and a fixed unit 221 and a movable unit 223
A first circuit breaker inspection grounding device ES11 is configured.

Each movable side unit 223 includes a rod-shaped movable contact 224 that comes into contact with and separates from a fixed contact provided on the fixed side unit,
The movable contactor 224 of the three-phase earthing device ES11 is connected to the connecting plate 2
25 (see FIG. 4). The connecting plate 225 is an L-shaped connecting lever 2 that is pivotally supported on the support plate 204.
26, and the other end of the connecting lever is connected to link 26.
27 and the operating lever 228, the support plate 204.2
04 is connected to a common operating shaft 229 extending horizontally between the two. One end of the operating shaft 229 airtightly passes through the lower part of the side wall on the front side of the outer shell container 201 and is led out to the outside, and is connected to a grounding device operating device to be described later.

Further, a fixed side unit 231 of a grounding device is connected to the lower end of the current transformer conductor 217. A movable unit 233 of the grounding device is mounted on the support base 205, and the fixed unit 231 and the movable unit 233 constitute a second grounding device ES12 for circuit breaker inspection. Each movable side unit 233 includes a rod-shaped movable contact 234 that comes into contact with and separates from a fixed contact provided on the fixed side unit 231,
The movable contacts 234 of the three-phase earthing device ES12 are also connected to each other by a connecting plate 225 in the same way as the movable contacts 224 of the first earthing device ES11 described above. It is connected to the operating shaft 229 via 229.

The bushings 240 and 2 are inserted through the bottom plate 202 in an airtight manner.
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 flEs11 and ES12 of the corresponding phases, respectively. Further, a bushing 244 is attached to pass through the bottom plate 202 in an airtight manner, and an output terminal of the current transformer CT is led out to the outside through a terminal conductor 244a provided to pass through the bushing 244 in an airtight manner.

As shown in FIG. 1, the container 300 of the first bus bar unit 3A includes a first pipe 301 that extends horizontally in the front-rear direction, and a first pipe 301 that is arranged at right angles to the first pipe 301 and extends horizontally in the lateral direction. It is formed in the shape of a cross tube consisting of an extending second tube 302, and a three-phase bus bar BS is installed in the second tube 302 of the container 300.
1 are arranged in parallel.

The three-phase bus conductor 303 is supported by an insulating spacer (not shown) disposed to hermetically close the end of the second tube 302. Further, one end of the first pipe 301 of the container 300 is connected to the first end of the outer shell container 201 via an insulating spacer 305.
The ends of the embedded conductors of each phase located in the container 300 and the bus conductor 303 of each phase are airtightly connected to the device connection opening 201a of the device and are airtightly passed through the insulating spacer 305. A bus-side new line switch DS11 is arranged between the two.

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

The second bus unit 3B is configured in exactly the same manner as the first bus unit 881, and the bus conductor 303 constituting the second bus 882 is inside the container 300 of the second bus unit 3B.
and a busbar side disconnector D S 12 are housed. Second
The container 300 of the busbar unit 3B has an insulating spacer 305
through the second equipment connection opening 20 of the outer shell container 201
1b, and a conductor 220 connected to the branch conductor 215 is connected to the end of the embedded conductor of the insulating spacer 305 located inside the outer shell container 201.

The container 400 of the cable head unit 4 is made of a tubular body arranged with its axis facing in the vertical direction.
A TL steamer connection opening 400a is provided on the upper side surface of the front side (outer shell container side) of the 0, and a second device connection opening 400b is provided at the upper end. Furthermore, container 40
A working opening 400C is provided at the lower part of the side wall on the back side of 0. Both the equipment mounting opening 400a and the working opening 400C are made of short tubes welded to the periphery of holes provided in the container 400, and seven langes are provided at the ends of the short tubes that make up each opening. It is provided.

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 an insulating spacer 401, and the insulating spacer 401 is provided with a three-phase embedded conductor. It is being Insulating spacer 40
The upper end of a current transformer conductor 217 is connected to the end of one embedded conductor located inside the outer shell container 201 via a connecting conductor 250. Further, 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 in 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. Connected to supported cable head CH. Further, a cable head grounding device WES2 and a lightning arrester LA are provided between the other end of the disconnector DS2 and the ground. The working opening 400C is hermetically closed by a cover plate 402. The cable head CH of each phase has a connector 403 attached to the terminal of the cable C of the corresponding phase.
is connected.

In this embodiment, the container 400 of the cable head unit 4
A box body 404 that covers the cable C rising from the underground cable bit is placed below, and the container 400 is supported by the box body 404. With this configuration, the mechanical strength of the device can be increased. Note that this box body 404 can also be omitted.

A disconnector operator 6 is attached to the lower part of the busbar container 300 of the first busbar unit 3A, and the operator 6 is connected to the movable contacts of the busbar side disconnectors DS11 and DS12 via an appropriate connection mechanism. There is. Also, the second bus unit 3B
A grounding device operating device 7 is attached to the lower part of the busbar container 301, and the operating shaft 229 is connected to the operating device 7. The earthing device WES is connected via the operating shaft 229 by the operating device 7.
11 and ES12 can be operated at once.

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

In the above embodiment, the present invention was applied to a gas insulated switchgear having an open/open circuit with a double busbar configuration, but by omitting one busbar unit, it is possible to apply the present invention to a gas insulated switchgear having an am circuit with a single busbar configuration. can also be configured.

In the above description, the present invention was applied to a feeder unit placed between a bus bar and a feeder connected to the bus bar, but the present invention may also be applied to a bus tie unit used to connect bus bars. Of course, it is possible to do so. For example, in FIG. 1, the cable head unit 4 is removed, the opening 201C is hermetically closed, 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 bus unit 3A. By doing so, it is possible to configure a bus tie unit that connects the buses BS1 and BS2. That is, the feeder unit and the bus tie unit can be configured by simply changing the arrangement of the conductors within the outer shell container.

If the upper end of the outer shell container 201 is configured to be openable as in each of the above 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 embodiment, the height of the outer shell container 201 can be lowered, so that the controller box 1
The height of 01 can be increased. Therefore, it is possible for a worker to enter the operating device box 101, and maintenance and inspection work can be facilitated.

As in the above embodiment, the support stand 205 is attached to the bottom plate of the outer shell container 201, and the circuit breaker and grounding device E3i1 are attached to the support stand 205. When installing the ES12, first place the support stand 205, m1liWcB, and grounding device ES11. on the bottom plate 202. After assembling the ES12 and the operation mechanism of the circuit breaker and grounding device, the outer shell container 20 is placed on the bottom plate.
Since the device can be assembled by suspending and covering the device, there is no need to assemble each part in a narrow space inside the outer shell container, and the device can be assembled easily.

Further, as described above, when the circuit breaker and the grounding device are mounted on the common support stand 205, the positions of both can be easily determined, thereby increasing the manufacturing efficiency of the device.

In the above embodiment, the outer shell container is arranged with its axis oriented in the vertical direction, but the present invention can be similarly applied when the outer shell container is arranged with its axis oriented in the horizontal direction. .

[Effects of the Invention] As described above, according to the present invention, since the circuit breaker and the grounding device are supported on the common support base 2, the number of parts can be reduced, and the structure is simplified and reliability is improved. be able to. Furthermore, since the number of assembly steps can be reduced, costs can be reduced. Furthermore, by supporting the circuit breaker and the grounding device on a common support base, it is possible to easily position them, making assembly easier and improving the manufacturing efficiency of the device. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing an embodiment of the invention.
Figure 3 is an enlarged cross-sectional view of the main part showing the vicinity of the grounding device for circuit breaker inspection shown in Figure 1, Figure 4 is a movable grounding device for circuit breaker inspection. FIG. 3 is a cross-sectional view schematically showing the operating mechanism of the side unit. 1... Controller unit, 101... Controller box, 10
4... Circuit breaker operator, 2... Main unit, 201
... Outer shell container, 202 ... Bottom plate, CB ... Circuit breaker, ESll and ES12 ... Grounding device for first and second circuit breaker inspection, 3A and 3B ... First and second bus unit, 831.882...bus, DSll and [
) 312...First and second bus-side new line equipment, 4...
・Cable head unit, CH...cable head, LA...surge arrester, DS2...trackside new road switch.

Claims (1)

[Claims] A circuit breaker and first and second circuit breaker inspection grounding devices for grounding both ends of the circuit breaker, respectively, are housed in an outer shell container filled with insulating gas for three phases. In the gas-insulated switchgear, one support stand is supported on the bottom plate of the outer shell container, and both the circuit breaker and the first and second circuit breaker inspection grounding devices are supported by the support stand. A gas insulated switchgear characterized by: