JP3309647B2 - Gas insulated switchgear - Google Patents

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, and more particularly to a gas-insulated switchgear having a long and narrow strip structure to save space and to be constructed on a narrow and narrow site or underground. The present invention relates to an insulated switchgear.

[0002]

2. Description of the Related Art Ultra-high voltage power transmission systems are being introduced into urban areas in order to cope with an increase in power demand, and multiple power transmission systems are being used in order to improve the reliability of power supply to maintain an advanced information society. Is progressing. Since these transmission systems are controlled by substations, the number of substations to be installed increases, and the transmission system becomes large-scale. These substations take the form of underground substations located in the basement of buildings due to severe site conditions in urban areas.However, underground substations have a larger floor area and occupied space than substations on the ground. Significant restrictions and high construction costs. In addition, the basement of the building is not necessarily a high priority for substation construction because it can be widely used for other purposes. On the other hand, miniaturization of substations requires gas-insulated switchgear.
(GIS) has been pursued by miniaturization, but recent technological development has been cut to one point up to a 550 kV gas circuit breaker (GCB), and gas-insulated buses have been progressing to three-phase integration up to 500 kV. The miniaturization is in a difficult phase in the future. In addition, GIS tends to be rather large due to multiplexing of buses or the like in order to improve supply reliability.

[0003]

In the above-mentioned prior art, it is difficult to obtain a substation construction site, and it is difficult to construct a substation in order to cope with an increase in power demand and an improvement in power supply reliability. .

[0004] This also has a problem in the construction of the substation and GIS. FIG. 22 shows a conventional configuration. FIG. 23 is a plan view of FIG. The transmission line 1 is connected to the service bus 2. The drop-in bus 2 is connected to the line GCB 3 and the line GCB
Reference numeral 3 is connected to main buses 5A and 5B via a communication bus 4. The main buses 5A and 5B are connected to the transformer GCB6,
The transformer GCB 6 is connected to the extraction bus 7 and the extraction bus 7
Is connected to the transformer 8. The double main buses 5A and 5B are connected by a bus connection GCB9.

As is apparent from this example, in the conventional GIS configuration, the construction site is a large site close to a square (two-dot chain line).
Is necessary, and if the transformer is included, the long side shown in FIG.
(L) and a wide area (W) are required. In urban areas, it is difficult to secure land of such a large size, and it will be even more difficult in the future. Here, the line unit aspect ratio is defined as follows in order to make the shape of the site easier to understand.

Referring to the aspect ratio representing the characteristics of the wing of an airplane, the line unit aspect ratio is obtained by dividing the projected area of the gas insulated switchgear (GIS) on the floor surface by the square of the maximum width orthogonal to the main bus. Divided by the number of transmission lines entering the gas-insulated switchgear ".

For example, if the projection plane is rectangular in one line, the line unit aspect ratio is (long side: length in main bus direction) / (width: length orthogonal to main bus). FIG.
L / W.

The reason why the definition is not simply defined by (long side) / (width) is that the figure projected on the floor is not necessarily a rectangle. For example, if the projection plane is a triangle whose height is in the direction of the main bus line in one line, the line unit aspect ratio is a value obtained by dividing the area of the projected triangle by the square of the base of the triangle. ) / (2 × base of triangle). The reason for dividing by the number of lines is that if the number of lines increases, the line becomes apparently slender as a whole, and the shape unique to the GIS cannot be discussed in the same manner as the minority line.

When the line unit aspect ratio defined as described above is applied to a conventional substation as shown in FIG.
Less than. In other words, not only the area but also the shape of the site is required to be a wide rectangle close to a square as a site for the substation, which is a problem when substations are constructed not only in urban areas but also on steep slopes. . SUMMARY OF THE INVENTION An object of the present invention is to achieve a flexible device configuration by considering the shape of a gas insulated switchgear in terms of a construction site.

[0010]

In order to achieve the above object, in a gas insulated switchgear of the present invention, two main buses are connected.
The breaker for connecting the bus and the transformer connecting the bus and the transformer
Circuit breakers for pressure transformers and circuit breakers connecting busbars and transmission lines
Circuit breaker, transformer circuit breaker and wire
Road circuit breakers are arranged on the same line parallel to the main bus, and
The busbar breaker is between the line breaker and the transformer breaker.
It is arranged in.

[0011]

[Operation] In a city area, it will become increasingly difficult to secure a wide rectangular land close to a square. However, focusing on the fact that land can be secured in urban areas as long as it is an elongated strip shape even in the same area, it is necessary to connect the transmission line and the circuit breaker so that it is suitable for land of such a shape.
And a gas-insulated switchgear with two main buses.
Bus breaker for connecting two main buses
Circuit breaker, bus and transmission line connecting
Connect the line breakers to be connected in the same line parallel to the main bus
Placed above, the circuit breaker for busbar connection and the circuit breaker and transformer
By placing it between circuit breakers,
By realizing the configuration of gas insulated switchgear suitable for the ground
In this way, the degree of freedom of the site for storing the equipment is secured.

Examples of sites having such a shape include many belt-like sites such as underground of public roads, under public viaducts, along river embankments, and underground parallel to public tunnels.
It is much easier to build a long and narrow tunnel than to build a rectangular room close to a vast square, even when building a dedicated basement.

[0013]

Embodiments will be described below with reference to the drawings. Figure 1 shows 2
1 shows an embodiment of the present invention of a GIS of a double main bus system. FIG.
FIG. 2 is a plan view of FIG. In FIG. 1, main buses 5A and 5B
Is a three-phase collective bus, in which vertical GCBs are arranged on a line between the main buses 5A and 5B, and the arrangement thereof is such that the length in the main bus direction is orthogonal to the main bus in the shape of projection on the floor surface. It is arranged so that it may become longer than the length which does. The GCBs are arranged in the order of the line GCB3, the busbar connecting GCB9, and the transformer GCB6, and the connecting portions 10A and 10B are mounted in a direction parallel to the main buses 5A and 5B. Transmission line 1 is connected to service bus 2, and service bus 2 is
As can be seen from FIG. 2, they are arranged in parallel above the main bus 5B and are connected to the upper connecting portion 10A of the line GCB3. The connecting bus 4 connected to the lower connecting portion 10B of the line GCB 3 and the transformer GCB 6 is branched into two and connected to the main buses 5A and 5B, respectively. In addition, contact bus 4
Disconnectors (DS) 11A, 11B are attached to the branch portions 4A, 4B in a direction orthogonal to the main bus 5 corresponding to each bus 5. As shown in FIG. 2, DS11C is attached to the end of the lead-in bus 2. The lead-out bus 7 connected to the upper connection portion 10A of the transformer GCB 6 is a drop-in bus 2
Similarly to the above, they are arranged in parallel above the main bus 5B and connected to the transformer 8. The busbar connecting GCB 9 is connected to the main busbar 5B at the upper connecting portion 10A and connected to the main busbar 5A at the lower connecting portion 10B. With such a configuration, it is possible to configure the gas insulated substation and the GIS on an elongated strip-shaped site that could not be realized by the GIS configuration as shown in FIGS. Further, FIG. 1 shows a case where the main generating line is a straight line. However, a configuration suitable for the land shape is possible without any problem even if the main generating line is a broken line or a partially curved shape. Further, since the main bus and the drop-in bus are arranged in parallel, connecting buses orthogonal to these are required for connection. However, since a part of the connection is shared by the GCB, the length of the connecting bus can be shortened. Further, in the configuration shown in FIG. 1, the gas-insulated substation including the transformer can be arranged on the elongated strip-shaped land by disposing the transformer 8 in the extension direction of the end of the GIS.

In the configuration of the phase separation type GCB of this embodiment, the line unit aspect ratio is 4.6. Phase separated GCB
Then, although it depends on the constituent devices, it is almost 4 or more in a general configuration. If the GCB is a three-phase batch type GCB, the GC
Since the length per line in the main bus direction of B becomes shorter, the line unit aspect ratio becomes smaller than that of the phase separation type and becomes 2 or more. In any case, an elongated belt-like configuration is possible as compared with a conventional line unit aspect ratio of less than 2.

FIG. 3 is a cross-sectional view of the line side GCB 3 in FIG. As shown by the two-dot chain line virtual circle in FIG. 3, in the GIS configuration of FIG. 1, the cross-sectional shape is 1.5 times the height of the GCB.
The component can be housed within a tubular area within a factor of two.
It is very economical to place it in tunnels underground or in the mountains because it can be handled by the shield method. Note that the tunnel with a circular section does not necessarily have to be horizontal to the ground plane.
There is no problem even if it is inclined with respect to the ground plane. One end protrudes from the ground surface, and as an inclined shaft, the other end is connected to an underground multi-purpose basement room, so that it can also be used as a carry-in path.

FIG. 4 shows an example in which main buses 5A and 5B are vertically arranged on one side of the GCB. By arranging the pull-in bus 2 above the main bus 5, the width W can be further reduced than in FIG. Fig. 5 shows the GCB for the track, and Fig. 6 shows the G for connecting the main bus.
The method of connecting the CB 9 to the drop-in bus 2 and the main bus 5 will be described.
With this arrangement, it is not necessary to lift the GCB when attaching and detaching the GCB, and the GCB can be attached and detached by moving in the lateral direction, so that the work can be easily performed. In addition, the support mechanism of the main buses 5A and 5B can be made common, and after assembling and integrating the double main buses at the factory, the carrying-in installation work becomes possible, so that the work time can be reduced.

The embodiment shown in FIG. 7 shows the disconnector 11 (D
It is an example of a different configuration when S) is attached. The technical pipe sections 4A and 4B of the connecting bus 4 are extended in the same direction as the longitudinal direction of the main bus, and the DS11 is stored therein. As is apparent from the sectional view of this part including the GCB shown in FIG. 7, the DS11 has the same operating direction as the main bus axis direction, so that the lateral width W of the GIS does not need to be increased. In the embodiment of FIG. 1, depending on the size of the main bus and the size of the GCB, D
There may be cases where the vertical dimension for installing S11 cannot be obtained. In such a case, the arrangement of FIG. 7 is effective.

The embodiment of FIG. 10 relates to the configuration of the bus center connection GCB12 shown in the connection diagram of the quadruple main bus system of FIG. 4
In the double main bus method, the main bus is set to 5AA, 5AB, 5BA, 5
BB divided into 4 parts, 5A system and 5B system, as well as GCB 9A, 9B for bus connection, 5AA, 5AB, 5BA
And 5BB, which are connected at the center of each other. A bus center connection GCB 12A and 12B are arranged in this way, and this is an example of the most advanced bus protection method at present. The busbar connecting GCBs 9A and 9B can be rationally arranged by the method shown in FIG. 1 and the like. However, when the busbars to be connected are arranged on the same plane with respect to the busbar center connecting GCB12A and 12B, the width of the GIS at this part Is spread to about three times, and the connecting bus becomes longer. Therefore, in the embodiment of FIG. 10, one main bus 5AA
Are arranged above the other main bus 5AB, and the two main buses are connected by a vertical GCB 12A. The position where the main bus 5BA and the main bus 5BB are connected is the main bus 5A.
A is shifted from the position where A and the main bus 5AB communicate. With such a configuration, as shown in the plan view of FIG. 11, a quadruple main bus system GIS can be configured without increasing the width W at this portion.

FIG. 13 shows two main buses 5A and 5B shown in the connection diagram of FIG. 12 connected by three GCBs in series.
It is an embodiment of the 2CB system GIS. FIG. 13 illustrates one circuit indicated by a dotted line in the connection diagram of FIG. GCBs 3A, 3B, 3C are arranged between the main buses 5A, 5B along the longitudinal direction of the main buses. The drop-in buses 2A, 2B are arranged above the main bus 5B and connected to the connecting buses 4A, 4B. With such an arrangement, the width W can be minimized. In addition, the length of the communication bus 4 can be reduced. FIG.
Is a different embodiment of the 1-1 / 2CB system GIS. The main buses 5A and 5B are arranged vertically, and three GCBs 3A and 3
B and 3C are arranged in a triangle, and the bottom of the triangle is made parallel to the main bus as shown in the plan view of FIG.
And the width is almost the same, and the length of the arrangement of the GCBs in the longitudinal direction can be reduced to about 2/3. When the GCB is of the phase separation type in FIG. 13, FIG. 13 shows one phase, and one line requires three times the length of FIG. 13. Therefore, if it is desired to reduce the length, as shown in FIG. The configuration is suitable.

FIG. 16 shows an embodiment of an underground substation according to the present invention. This is an example in which it is placed in an underground tunnel with a circular cross section that is perforated by the shield method. The main buses 5A and 5B are phase-separated buses, and are vertically arranged on both sides of the circular cross section.
The lead-in bus 2 from 2B is arranged up and down, and GCB3 is arranged at the center. The transformers 8A, 8B and 8C are arranged in tandem in each phase separation type so that they are housed in the same circular cross section. GIS devices 13 on the low voltage side are arranged on the opposite side of the transformer, and cables are drawn from both ends of the tunnel.

FIG. 17 shows an embodiment of a four-line underground substation. Although the configuration of FIG. 16 can accommodate multiple lines by increasing the diameter or length of the circular cross section, FIG.
In 7, a circular underground tunnel is pierced vertically or horizontally for every two lines, GIS is arranged, and the main bus 5 is connected by the connecting bus 4, thereby increasing the diameter or the length of the circular cross section without increasing the number of multi-circuits. Storage is possible. In this case, the two underground tunnels need not necessarily be parallel. Cable 22A,
Arbitrary arrangement is possible depending on the laying conditions of 22B, 22C and 22D and the condition of the site. Construction at a distant place is also possible as long as the connection can be made by the connection bus 4.

If GCB is inserted at the position of the connecting bus 4, FIG.
The quadruple main bus method shown in FIG. In such a configuration, even if a disaster such as a fire occurs in one of the underground tunnels, it is possible to prevent the spread to the other underground tunnels, so that the underground substation has a more excellent disaster prevention effect.

FIG. 18 shows a viaduct 1 for an expressway or an elevated railway.
4 is an embodiment in the lower space. In this embodiment, GCB
Reference numeral 3 also denotes a three-phase collective type, in which double main buses 5A and 5B are vertically arranged. The axes of the double main buses 5A and 5B are parallel to the axis of the viaduct, and are arranged along the shape of the viaduct. The busbar connection GCB9 is arranged at the end of the main busbars 5A and 5B. When there is a degree of freedom in the dimension of the width (in this embodiment, the width that can be used for the GIS differs depending on whether the pier 15 is present or not), such an arrangement is also possible. That is, the configuration can be changed according to the site where construction is possible. In such a configuration, the transmission line cable 22
Can be arranged along the viaduct 14, and there is no need to newly configure a power transmission route. Further, the cable 22 may be constituted by a gas insulated line.

FIG. 19 shows an example in which a semicircular building 16 is constructed between the piers 15 and the GIS is stored therein. As described in FIG. 1 and subsequent figures, the GIS of the present invention has such a configuration that it can be easily stored in such a semicircular building 16. In addition, since such a building has high strength, the bridge pier 15 and the viaduct are supported. The support of viaducts can also be strengthened, which can be used as an earthquake countermeasure, and can isolate GIS from external pollution.

FIG. 20 shows an embodiment in the vicinity of a river 17. At substations, component devices generate heat due to power distribution. In particular, heat generation in the transformer 8 is large. In this embodiment, the water flow of the river 17 is diverted to form a cooling flow channel 18 to be brought into contact with the outer periphery of the underground substation for cooling, and a heat exchanger 19 is arranged in the cooling flow channel to cool the transformer 8. Do. Since it is constructed underground, it can be constructed on a riverbed as shown in FIG. When constructing on a riverbed, it is necessary to consider the flooding above the ground. As a countermeasure, one is to adopt a waterproof structure similar to a submarine tunnel, and the other is to drain the water by a pump (not shown) into a drainage channel 20 installed below an underground substation provided separately. This drainage channel 20 is always an inspection passage, and communicates with the underground substation at important points with a disaster prevention type door. As a result, it can be used as an evacuation route in the event of a fire accident at a substation.

FIG. 21 shows an example in which different tunnels 21 are arranged in parallel. This tunnel 21 may be a general tunnel for public use. In this case, it is possible to use the general tunnel to carry out and carry out the equipment. If the general tunnel is a railway, it is possible to carry it in and out using the tracks. In the case of a dedicated tunnel, in addition to the above applications, it can be used as a cooling fluid passage for a substation.

[0027]

According to the present invention, the configuration of the gas insulated switchgear can be formed in a slender belt shape, so that the location of a substation in an urban area where land acquisition is difficult can be facilitated,
Construction is possible under public roads and railways. In the case of underground construction, it is not necessary to construct a large-scale basement, and a tunnel can be used. or,
When building on steep slopes even in mountainous areas, if you adopt a belt-like configuration,
The portion to be cut is minimized, and a preferable device can be provided from the viewpoint of environmental harmony.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a GIS and a transformer according to an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment according to FIG. 1;

FIG. 3 shows a cross section of the embodiment according to FIG.

FIG. 4 is a block diagram of a gas-insulated switchgear according to another embodiment of the present invention, in which double main buses are arranged in tandem.

FIG. 5 is a diagram showing a connection method between the line GCB of FIG. 4 and a bus.

FIG. 6 is a diagram showing a connection method between the bus bar connecting GCB of FIG. 4 and a bus bar.

FIG. 7 is a configuration diagram of a gas insulated switchgear according to a different embodiment of the present invention, in which a disconnector operates in an axial direction of a main bus.

FIG. 8 is a diagram showing an internal structure of a GCB of the GIS shown in FIG. 7 and a disconnector.

FIG. 9 is a diagram showing a connection relationship of a bus connecting GCB of a quadruple main bus method.

FIG. 10 is a diagram showing a different embodiment of the present invention and showing a configuration of a quadruple main bus system bus connecting GCB.

FIG. 11 is a plan view of the bus bar connection GCB shown in FIG. 10;

FIG. 12 is a diagram showing a bus connection system of the 1-1 / 2 CB system.

FIG. 13 illustrates a different embodiment of the present invention,
FIG. 2 is a configuration diagram of a GIS when applied to the B system.

FIG. 14 illustrates a different embodiment of the present invention,
The block diagram of another Example of GIS when applied to the B system.

FIG. 15 is a plan view of the GIS shown in FIG. 14;

FIG. 16 is a configuration diagram showing a different embodiment of the present invention, wherein a GIS according to the present invention is arranged in an underground tunnel.

FIG. 17 shows a different embodiment of the present invention, and is a configuration diagram when the GIS according to the present invention is applied to an underground tunnel compatible with multiple lines.

FIG. 18 shows a different embodiment of the present invention, and is a configuration diagram when a GIS according to the present invention is arranged under a viaduct.

FIG. 19 shows a different embodiment of the present invention, and is a configuration diagram when a GIS according to the present invention is arranged in a building under a viaduct.

FIG. 20 shows a different embodiment of the present invention, and is a configuration diagram when river water is used for cooling the substation according to the present invention.

FIG. 21 is a diagram showing a different embodiment of the present invention, wherein a substation equipment according to the present invention is provided in a parallel tunnel.

FIG. 22 is a diagram showing the arrangement of a conventional gas-insulated substation.

FIG. 23 is a plan view of FIG. 22;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transmission line, 2 ... Pull-in bus, 3 ... Track GCB, 4
... Connection bus, 5 ... Main bus, 6 ... GCB for transformer, 7 ... Extraction bus, 8 ... Transformer, 9 ... GCB for bus connection, 10 ... G
CB connection part, 11: disconnector, 12: GC connecting the center of the bus
B, 13: Low pressure side GIS, 14: Viaduct, 15: Bridge pier,
16: Building, 17: River, 18: Cooling channel, 19: Heat exchanger, 20: Drainage channel, 21: Public tunnel, 22: Cable.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Natsui 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Joe Kamata Omikamachi, Hitachi City, Ibaraki Prefecture No. 2-1 Hitachi Power Systems Co., Ltd. (56) References JP-A-59-194607 (JP, A) JP-A-4-304104 (JP, A) JP-A-63-18908 (JP) JP-A-58-116006 (JP, A) JP-A-59-106808 (JP, A) JP-A-3-11309 (JP, U) JP-A-57-93018 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 13/02 H02B 7/08

Claims (7)

(57) [Claims] 1. A gas-insulated switchgear having a plurality of circuit breakers, a drop-in bus connecting a power line and the circuit breaker, and two main buses, wherein a bus connection connecting the two main buses is provided. A circuit breaker for connecting the bus bar and a transformer, and a circuit breaker for connecting the bus and the power transmission line, the circuit breaker for bus connection, the circuit breaker for the transformer, and A gas insulated switchgear, wherein the line breaker is arranged on the same line parallel to the main bus, and the bus breaker is arranged between the line breaker and the transformer breaker. apparatus. 2. The gas insulated switchgear according to claim 1, wherein said lead-in bus is installed in parallel with said main bus. 3. The gas insulated switchgear according to claim 1, wherein the circuit breaker is installed vertically. 4. The gas insulated switchgear according to claim 1, wherein each of the circuit breakers is installed at a location surrounded by the two main buses. 5. The gas insulated switchgear according to claim 4, wherein the two main buses are provided with one main bus above the other main bus. 6. The gas insulated switchgear according to claim 5, wherein a lead-in bus is provided above the main bus. 7. The gas insulated switchgear according to claim 1, further comprising disconnectors disposed at both ends of the one circuit breaker, wherein the operating direction of the disconnector is the same as that of the main bus. Gas insulated switchgear characterized by being parallel.