JPH0898344A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: To eliminate the necessity of the preparation of excessive rooms above and below an underground construction in which a switchgear, etc., are installed. CONSTITUTION: One side ends of the line circuit 41 of a low voltage switchgear and the line circuit 51 of a high voltage switchgear are connected to a breaker 1 through instrument transformers 6, line side grounding switches 5, line side disconnectors 4, inspection grounding switches 3 and current transformers 2. The other side ends of the line circuits 41 and 51 are connected to cable connectors 7 at the position where the line circuits 41 and 51 cross over unit linking bus-bars 31 and 32. The cable connectors 7 and the unit linking bus-bars 31 and 32 are provided in a cable tunnel 15 adjacent in a horizontal direction to a room in which a switchgear is installed. The one side ends of power cables 8 are connected to the top parts of the cable connectors 7 and the other side ends of the power cables 8 are extended upward to be connected to external bushings. The breaker 1 is connected to a main bus-bar 11 through an inspection grounding switch 9 and a bus-bar side disconnector 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, and more particularly to a gas insulated switchgear arranged in an underground substation or a switchgear.

[0002]

2. Description of the Related Art In a substation or the like, an overhead line drawn from an overhead power transmission line from an adjacent power plant or the like is connected to a bushing, and the overhead line from the bushing is connected to a transformer via a switchgear. The switchgear is interposed between the bushing and the transformer to open and close the electric circuit when an abnormal voltage is generated or during inspection work. There are various types of switchgear, but among them, the gas-insulated switchgear uses SF6 gas, which has an insulation capacity several times that of air, so it is superior to other switchgear in insulation performance and arc extinction performance. Has the advantage. Further, in the gas-insulated switchgear, since all the charging parts are completely housed in the metal container, the gas-insulated switchgear is unlikely to be affected by the external environment, and the arc extinguishing medium is not ejected to the outside. Therefore, the gas-insulated switchgear using the gas-insulated device is excellent in terms of environment in combination with the size reduction. For this reason, gas-insulated switchgear is mostly used in recent substations and the like.

In recent years, as the demand for electric power has increased, the power system is required to transmit high voltage and large current more and more, but especially when constructing a substation or the like around a large city, land acquisition is required. It's getting very difficult. Therefore, in order to further streamline maintenance and inspection from the viewpoint of environmental harmony with houses in large cities and ensuring safety, the number of cases where gas-insulated switchgear is installed in underground structures is increasing. I'm doing it. However, a structure is installed underground,
In order to dispose the gas-insulated switchgear inside it, it is necessary to excavate the underground, and it is costly. For this reason, how rational the layout of the gas insulated switchgear,
Whether to reduce the installation area and volume is a challenge that is required for the entire substation. Further, switching equipment such as a circuit breaker and a switch forming a gas-insulated switchgear is three-dimensionally arranged to reduce the size of each device.

An example of the layout of such a conventional gas-insulated switchgear will be described below with reference to the drawings. That is, as shown in FIGS. 9 and 10, the equipment on the line side is connected to the upper terminal of the circuit breaker 1, that is, the current transformer 2 for the instrument, the grounding switch 3 for maintenance on the line side of the circuit breaker 1, and the line side disconnection. The device 4 and the line side grounding switch 5 are connected. Further, as shown in FIG. 11, the lower terminal of the circuit breaker 1 is provided with a bus bar side maintenance earthing switch 9 of the circuit breaker 1, a bus bar side disconnector 10 and an instrument transformer 6, and a one-line device. And the other lines are bus 11
Connected by. Further, a power cable connecting portion 7 is provided in the horizontal direction of the circuit breaker 1. Then, one end of the power cable 8 is connected to the cable connecting device 7, and the other end extends downward.

The switching equipment group as described above is housed in an underground structure. That is, a plurality of rooms partitioned by partition walls are formed in the underground structure, and the opening / closing facility group is fixed to the floor 14 of each room. On the floor 14,
A hole 14a is provided for passing the power cable 8. As shown in FIG. 12, a cable processing chamber 12 is provided below the floor 14, and a cable cavern 13 is provided at a position adjacent to the cable processing chamber 12. The cable connecting device 7 is guided to the cable processing chamber 12 through the hole 14a of the floor 14, and further passes through the cable sluice 13,
It has been pulled out. In addition, when there are a plurality of sets of switching equipment groups, these are connected by a connecting bus bar, and a power cable for connecting the connecting bus bar and the switching equipment group to the transformer is also installed. A space for loading and unloading each of the switching equipment group and the transformer is provided in the underground structure. The switchgear group can be disassembled at the time of loading and unloading.

[0006]

However, the above-described conventional gas-insulated switchgear has the following problems. That is, since the power cable 8 extends downward from the cable connecting device 7, it is necessary to provide a room such as the cable processing room 12 and the cable sill 13 at the bottom of the room where the switchgear group is provided. As described above, providing another room in the vertical direction requires a deeper excavation to construct the underground structure, which increases the cost.

When there are a plurality of sets of switching equipment, these are connected by a connecting bus bar, but if a room for arranging the connecting bus bar is provided separately, the manufacturing cost becomes extra. In addition, if the number of switchgear groups is large, the connecting bus bar becomes long and the manufacturing cost increases.

Since the cable connecting device 7 is provided in the same room as the switching equipment group and in a position close to it, it is not possible to secure a wide space around the cable connecting device 7, and the terminal treatment work of the power cable is not possible. Hard to do.

In addition, it is necessary to partition the transformer room and attach a fire extinguisher in the underground structure due to disaster prevention problems.
In addition, since a space for loading and unloading each of the switching equipment group and transformers is required, the size of the underground structure will increase accordingly.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and its main purpose is to provide an extra room in the vertical direction in an underground structure provided with switchgear equipment and the like. It is an object of the present invention to provide a gas-insulated switchgear that does not need to be provided and can save the cost for excavation.

A second object of the present invention is to provide a gas-insulated switchgear which does not require a special room for a connecting bus bar for connecting a plurality of sets of switchgear equipment in an underground structure.

A third object is to provide a gas-insulated switchgear capable of ensuring a wide space around the cable connecting device and facilitating the terminal treatment work of the power cable.

A fourth object of the present invention is to provide a gas-insulated switchgear capable of saving the length of the connecting bus bar connecting these even if the number of switchgear groups is large.

A fifth object is to provide a gas-insulated switchgear which does not require a fire extinguishing facility by partitioning the transformer room.

A sixth object of the present invention is to provide a gas-insulated switchgear capable of saving space for loading and unloading switchgear equipment groups and transformers.

[0016]

In order to achieve the above-mentioned object, the invention according to claim 1 provides a gas-insulated switchgear group connected to each other by a main bus, and a switchgear group connected to the gas-insulated switchgear group. The switchgear includes a power cable connected to an electric wire, a cable connector that connects an end of the power cable and a switchgear group, and a line line that connects the cable connector and the switchgear group. In a gas-insulated switchgear installed in an underground structure in which a group is partitioned into a plurality of rooms by partition walls, the power cable is connected in a direction extending upward from the cable connecting device. Characterize.

According to a second aspect of the invention, in the gas-insulated switchgear according to the first aspect, a plurality of sets of the switching equipment groups are provided, and a room in which the switching equipment group is installed in the underground structure is provided. The cable connecting device is arranged in a horizontally adjacent room, arranged in a direction parallel to the main bus bar, and a connecting bus bar that connects the plurality of sets of switching equipment groups to each other is provided in the same room as the cable connecting device. And a connection line that is arranged in a direction orthogonal to the communication busbar and that connects the communication busbar and the plurality of sets of switching equipments.

According to a third aspect of the present invention, in the gas-insulated switchgear according to the second aspect, the line circuit is provided in a direction orthogonal to the connecting busbar, and the cable connecting device is located at a position beyond the connecting busbar. It is characterized by being arranged.

According to a fourth aspect of the present invention, in the gas-insulated switchgear according to the third aspect, the sets of the switching equipment groups are arranged on the same straight line, and the connecting lines in the sets of the switching equipment groups at both ends are intermediate. It is characterized in that it is arranged close to the side of the group of switchgear facilities.

According to the invention of claim 5, a gas-insulated switchgear group connected to each other by a main bus, a power cable connecting the switchgear group to a power transmission line, an end of the power cable and a switchgear. A cable connecting device for connecting a group, and a line line connecting the cable connecting device and the opening / closing equipment group, the opening / closing equipment group in an underground structure partitioned by a partition wall into a plurality of rooms In the installed gas-insulated switchgear, a gas insulation transformer is arranged in a room horizontally adjacent to a room in which the switchgear group is installed in the underground structure, and the switchgear group and the gas-insulated transformer are installed. It is characterized in that it is connected to a transformer by a gas insulated busbar.

According to a sixth aspect of the present invention, in the gas-insulated switchgear according to the fifth aspect, a gas-insulated transformer and a carry-in / out space that also serves as a switchgear group are provided in the underground structure, and the gas-insulated transformer is provided. The container is arranged in the vicinity of the carry-in / out space, and the opening / closing facility group is arranged at a position apart from the carry-in / out space.

[0022]

The operation of the present invention as described above is as follows. That is, according to the first aspect of the invention, the power cable connected to the cable connecting device extends upward. Therefore, it is not necessary to arrange the cable treatment room and the like in the room below the switchgear, and the depth required for the underground structure is reduced.

According to the second aspect of the present invention, the room in which the switching equipment group is installed and the room in which the cable connecting device is installed are horizontally adjacent to each other, and the connecting bus bar connecting between the plurality of opening and closing equipment groups is the cable connection. Since it is provided in the same room as the equipment, there is no need to provide a special room for the communication bus.

According to the third aspect of the invention, since the cable connecting device is installed at a position over the connecting busbar and away from the switchgear, a wide space can be secured around the cable connecting device. Therefore, a sufficient space can be secured for the terminal treatment of the power cable.

In a fourth aspect of the present invention, when a plurality of switch equipment groups are connected in series, the connecting lines in the switch equipment groups at both ends are arranged closer to the intermediate switch equipment group side. ing. Therefore, it is not necessary to increase the length of the connecting bus bar that connects the switching equipment groups to each other to the total length of the switching equipment groups in which a plurality of sets are connected.

According to the invention of claim 5, the gas-insulated transformer is arranged horizontally adjacent to the switchgear group and connected to each other by the gas-insulated bus bar, so that the transformer room is divided to extinguish the fire. Eliminates the need for equipment.

According to the sixth aspect of the present invention, since the underground structure is provided with a loading / unloading space that also serves as a gas-insulated transformer and a switchgear group, a switchgear group and a gas-insulated transformer can be carried in and out respectively. No need to take up space.
Further, since the gas-insulated transformer is provided near the loading / unloading space and the decomposable switchgear group is provided at a position apart from the loading / unloading space, there is no problem in loading / unloading.

[0028]

An embodiment of the present invention will be described below with reference to the drawings. In addition, the switching equipment group according to claims 1 to 6 is assumed to be configured by three sets of units as a whole, with two types of switching equipment for high voltage and low voltage as one set. A room in which the cable connecting device according to any one of claims 2 to 4 is arranged is a cable cavern, a communication bus is a unit communication bus, and a communication line is a unit communication line.

(1) Configuration of Embodiment First, the overall configuration of this embodiment will be described. That is, as shown in FIG. 1, the gas insulated switchgear is composed of a first unit, a second unit and a third unit. Each unit is arranged such that the high-voltage switchgear and the low-voltage switchgear constituting the respective units are alternately arranged and their main bus axes are parallel to each other. That is, from the left in FIG. 1, the high-voltage switchgear 101a of the first unit, the low-voltage switchgear 102a, and the high-voltage switchgear 10 of the second unit.
1b, the low voltage switchgear 102b, the high voltage switchgear 101c of the 3rd unit, and the low voltage switchgear 102c are arrange | positioned. The above units are installed in the underground structure.

Each of these units is provided with a unit connecting line and a unit connecting bus bar for connecting the units to each other. That is, the high voltage switchgear is provided with unit communication lines 52a, 52b, 52c, respectively, and the low voltage switchgear is provided with the unit communication line 4a.
2a, 42b, 42c are provided. The unit communication lines 52a, 52b, 52c are connected by the unit communication bus 31, and the unit communication lines 42a, 42c are connected.
2b and 42c are connected by a unit connecting bus bar 32. In particular, the unit communication lines 52a, 42a, 52c, 42c of the first unit and the third unit are
Unit connecting busbars 31, 32 arranged closer to the unit
Is connected to the end of.

Further, the high-voltage switchgear is connected to the gas-insulated transformers 21a, 21b, 21c via a switch such as a circuit breaker and gas-insulated buses 25a, 25b, 25c. The gas insulation transformers 21a, 21b, 21c are connected to the low voltage switchgear via switches such as gas insulation buses 24a, 24b, 24c and circuit breakers. Further, the high voltage switchgear includes switches such as circuit breakers, gas-insulated buses 23a, 2
Gas insulation transformers 22a, 22b,
22c.

In the gas-insulated switchgear arranged as described above, the gas-insulated transformers 22a, 22b, 22c, 21 are installed so that the switchgear can be carried in and out when it is not suitable or for maintenance inspection.
(a), 21b, 21c form the (X) portion in the plan empty space diagram. The gas-insulated transformer is close to the carry-in / out space X, but the switching equipment group is arranged on the far side away from the carry-in / out space X.

Next, the configurations of the low-voltage switchgear and the high-voltage switchgear in each unit will be described. That is, the low-voltage switchgear has, as shown in FIGS. 2 and 3, eight line circuits 41 provided in a direction orthogonal to the unit connecting buses 31 and 32. As shown in FIG. 5 and FIG. 6, one end of these line circuits 41 is connected to the instrument transformer 6, the line side grounding switch 5, the line side disconnecting switch 4, the inspection grounding switch 3, and the current transformer 2. It is connected to the circuit breaker 1 via the. The other end of the line line 41 is connected to the cable connecting device 7 over the unit connecting buses 31 and 32. The cable connecting device 7 and the unit connecting bus lines 31 and 32 are horizontally adjacent to the room in which the switchgear is arranged.
It is located at 5.

One end of the power cable 8 is connected to the upper portion of the cable connecting device 7, and the other end of the power cable 8 extends upward and is pulled out to the outside to be connected to the bushing. Further, the circuit breaker 1 is connected to the main busbar 11 via a grounding switch 9 for inspection and a busbar side disconnector 10. Further, one end of the unit connecting line 42 is connected to the unit connecting bus 3
2 is connected to the other end, and the other end is an instrument transformer 6, a line side grounding switch 5, a line side disconnector 4, an inspection grounding switch 3, and a current transformer 2.
It is connected to the circuit breaker 1 via.

The high voltage switchgear, as shown in FIGS. 2 and 4, has two line lines 51 provided in a direction orthogonal to the unit connecting buses 31 and 32. As shown in FIGS. 7 and 8, one end of each of the line circuits 41 is connected to the circuit breaker 1 via the instrument transformer 6, the grounding switch 5, the disconnector 4, and the inspection grounding switch 3. There is. Railroad line 4
The other end of 1 passes over the unit connecting buses 31 and 32 and is connected to the cable connecting device 7. The cable connecting device 7 and the unit connecting lines 31 and 32 are arranged in alignment with the cable tunnel 15. One end of the power cable 8 is connected to the upper portion of the cable connecting device 7, and the other end of the power cable 8 extends upward and is drawn out to the outside to be connected to the bushing. Further, the circuit breaker 1 is a bus-side disconnector 10
Is connected to the main bus 11 via the, and the inspection installation switch 9 is provided between them.

Further, one end of the unit connection line 52 is
It is connected to the unit connecting bus 31, and the other end is connected to the circuit breaker 1 via the instrument transformer 6, the grounding switch 5, the disconnector 4, and the inspection grounding switch 3. The unit connecting lines 52 in the first unit and the third unit are arranged on the second unit side, and are connected to the unit connecting buses 3 respectively.
It is connected to one end.

(2) Operation and effects of the embodiment The operation and effects of the present embodiment having the above-mentioned structure are as follows. That is, since the cable connecting device 7 is provided in the cable cavern 15 which is horizontally adjacent to the room of the switchgear group and the power cable 8 is connected upward, the cable cavern etc. should be placed in the lower part of the switchgear group. The height of the underground structure can be reduced as compared with the case where it is provided. Therefore, the depth of excavation can be reduced, and the construction cost can be reduced. In addition, the unit connecting buses 31 and 32 connecting the units are connected to the cable cave 15
Since it is provided in the above, it is not necessary to provide a special installation space for the unit connecting buses 31 and 32, and it is possible to reduce the size of the entire underground structure.

Since the cable connecting device 7 is installed at a position far from the switchgear and the like over the unit connecting buses 31 and 32, a wide space can be secured around the cable connecting device 7. Therefore, a sufficient space is available for the terminal treatment of the power cable 8, and the work is easy.

Since the unit connecting lines 42 and 52 in the first unit and the third unit are arranged on the second unit side, the unit connecting bus lines 31 and 32 do not require the entire length from the first unit to the third unit. Therefore, it is possible to shorten the length of the unit connecting busbars 31, 32.

Since the gas-insulated transformer is placed in the room adjacent to the switchgear group and the gas-insulated transformer and the switchgear group are connected by the gas-insulated busbar, disaster prevention is possible even without a fire extinguisher. There is no problem above and the safety of the substation is improved. In addition, maintenance and inspection facilities such as gas processing can be shared, and maintenance and inspection can be rationalized.

A gas-insulated switchgear that can be disassembled due to nonconformity or maintenance / inspection can be carried in / out of space X rather than a gas-insulated transformer.
Since it is placed on the back side of the equipment and the switching equipment can be carried in and out from the space between the gas insulated transformers,
The building space can be reduced because there is no need to take in / out space for the switchgear and the gas-insulated transformer.

(3) Other Examples The present invention is not limited to the above examples, but the number, size, shape, material, etc. of each member can be changed as appropriate. For example, the number of circuit breakers and switches that make up the switchgear group is not limited to that in the above embodiment, and can be increased or decreased freely. Moreover, the number of units of the switching equipment group is not limited to three, and the number can be increased or decreased.

[0043]

According to the present invention as described above, a simple structure in which a power cable is connected to a cable connecting device so as to extend upward is provided in an underground structure provided with a switchgear or the like. It is possible to provide a gas-insulated switchgear that does not require an additional room in the direction and can save the cost for excavation.

Gas having a simple structure in which the connecting busbar and the cable connecting device are provided in the same room does not require a special room for connecting busbars for connecting a plurality of sets of switchgear equipment in an underground structure. An insulating switchgear can be provided.

With a simple structure in which the cable connecting device is installed at a position away from the switchgear by overcoming the connecting bus bar, a wide space can be secured around the cable connecting device, and the power cable terminal processing work can be performed. It is possible to provide a gas-insulated switchgear that is easy to open.

Even if the number of sets of switchgear groups is large, the connecting lines in the set of switchgear groups at both ends are placed close to the side of the set of switchgear groups in the middle, whereby a simple structure is adopted.
It is possible to provide a gas-insulated switchgear capable of saving the length of the connecting busbar.

It is not necessary to partition the transformer room to provide a fire extinguishing facility with a simple construction in which the gas-insulated transformer is arranged horizontally adjacent to the switchgear group and connected to each other by the gas-insulated busbar. A gas-insulated switchgear can be provided.

A gas insulated switchgear capable of saving the space in the underground structure can be provided by a simple structure in which a loading / unloading space that also serves as a gas insulation transformer and a group of switching facilities is provided in the underground structure.

[Brief description of drawings]

FIG. 1 is a plan view of an entire gas-insulated switchgear according to an embodiment of the present invention.

FIG. 2 is a plan view showing details of a second unit in FIG.

FIG. 3 is a plan view of the low voltage switchgear in FIG.

FIG. 4 is a plan view of the high voltage switchgear in FIG.

5 is a side view taken along the line AA of the line circuit of FIG.

6 is a side view of the unit communication line of FIG. 3, taken along the line BB.

FIG. 7 is a side view of the line circuit of FIG. 4, taken along the line CC.

8 is a side view of the unit communication line of FIG. 4, taken along the line DD.

FIG. 9 is a plan view showing a conventional low voltage gas insulated switchgear.

FIG. 10 is a plan view showing a conventional high voltage switchgear.

FIG. 11 is a side view showing a line circuit of a conventional low voltage switchgear.

FIG. 12 is a side view showing a line circuit of a conventional high voltage switchgear.

[Explanation of symbols]

 1 ... Circuit breaker 2 ... Current transformer 3 ... Grounding switch for maintenance 4 ... Line side disconnecting switch 5 ... Line side grounding switch 6 ... Transformer for instrument 7 ... Cable connection device 8 ... Power cable 9 ... Grounding switching for maintenance Container 10 ... Bus-side disconnector 11 ... Main bus 12 ... Cable processing room 13, 15 ... Cable tunnel 14 ... Floor 21, 22 ... Transformer 23, 24, 25 ... Gas-insulated bus 31, 32 ... Unit communication bus 41, 51 ... Line circuit 42, 52 ... Unit communication line 43, 53 ... Transformer line 101 ... High-voltage switchgear 102 ... Low-voltage switchgear

Claims (6)

[Claims] 1. A gas-insulated switchgear group connected to each other by a main bus, a power cable connecting the switchgear group to a transmission line, and a cable connecting an end of the power cable to the switchgear group. A connecting device, and a line circuit connecting the cable connecting device and the switchgear group,
In the gas-insulated switchgear installed in the underground structure in which the switchgear group is partitioned into a plurality of rooms by partition walls, the power cable is connected in a direction extending upward from the cable connecting device. Gas insulated switchgear characterized by 2. A plurality of sets of the switching equipment groups are provided, and the cable connecting device is arranged in a room horizontally adjacent to a room in the underground structure in which the switching equipment groups are installed. Arranged in a direction parallel to the busbar, a connecting busbar connecting the plurality of sets of switchgear groups to each other is provided in the same room as the cable connecting device, is arranged in a direction orthogonal to the connecting busbar, and the connecting busbar The gas-insulated switchgear according to claim 1, further comprising a communication line that connects the plurality of sets of switchgear equipment. 3. The gas-insulated switchgear according to claim 2, wherein the line circuit is provided in a direction orthogonal to the connecting busbar, and the cable connecting device is arranged at a position over the connecting busbar. apparatus. 4. The set of switchgear groups is arranged on the same straight line, and the connecting lines in the set of switchgear groups at both ends are arranged closer to the side of the intermediate set of switchgear groups. The gas-insulated switchgear according to claim 3, which is characterized in that. 5. A gas-insulated switchgear group connected to each other by a main bus, a power cable connecting the switchgear group to a transmission line, and a cable connecting an end of the power cable to the switchgear group. A connecting device, and a line circuit connecting the cable connecting device and the switchgear group,
A gas-insulated switchgear installed in an underground structure that partitions the switchgear group into a plurality of rooms by partition walls, in a horizontal direction with respect to a room in which the switchgear group in the underground structure is installed. The gas-insulated switchgear according to claim 4, wherein a gas-insulated transformer is arranged in an adjacent room, and the switching equipment group and the gas-insulated transformer are connected by a gas-insulated bus bar. 6. The underground structure is provided with a loading / unloading space that also serves as a gas insulation transformer and a switching equipment group, the gas insulation transformer is disposed in the vicinity of the loading / unloading space, and the switching equipment group is The gas-insulated switchgear according to claim 5, wherein the gas-insulated switchgear is arranged at a position distant from the loading / unloading space.