JPH08251735A - Gas insulated transformer station - Google Patents

Abstract

PURPOSE: To reduce an occupying space and to secure the send in and out paths of devices by a simple means for adequately arranging a tap switch, a cooling device and a gas insulated switchgear around the tank of a transformer. CONSTITUTION: Tanks 2a-2c in each phase for a gas insulated transformer 1 are arranged approximately in straight line. At one side of the arranging direction of the tanks 2a-2c in each phase, a tap switch 3 of the gas insulated transformer is arranged, and a cooling device 7 for the insulating gas in the gas insulated transformer 1 is arranged at the opposite side part. The gas insulated switchgear 10 is arranged at the end part of the aligned direction of the tanks 2a-2c in each phase. A main bus 11 of the gas insulated switchgear 10 is arranged in parallel with the axis connecting the centers of the tanks 2a-2c in each phase. A device constituting line circuits 12a and 12b is arranged in the direction perpendicular to the axial direction of the main bus 11 from the main bus 11. The main bus 11 and a terminal 6 at the primary side or the secondary side of the gas insulated transformer 1 are connected by a gas insulated bus line 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated substation which is a combination of a gas-insulated transformer and a gas-insulated switchgear.

[0002]

2. Description of the Related Art In recent years, at substations located around large cities (the substations described in this specification include general switchyards), due to reasons such as difficulty in obtaining land and environmental harmony. A gas-insulated switchgear is used in which a circuit breaker, a disconnector, a busbar, and the like are configured by gas-insulated equipment that is insulated with SF6 gas or the like. In this gas-insulated switchgear, devices such as a circuit breaker are three-dimensionally arranged to reduce the size of each device, thereby significantly reducing the installation area and volume. Further, recently, in large cities, substations are often installed in buildings or underground for the purpose of environmental harmony with houses, safety, and rationalization of maintenance and inspection. Therefore, it has been a challenge for the entire substation to rationalize the layout of the transformer and the gas-insulated switchgear constituting the substation and reduce the installation area and volume. Also, in the conventional underground substation, an oil-filled transformer was used as the transformer, so the transformer and the gas-insulated switchgear could not be placed in the same room for disaster prevention reasons. In recent years, a gas-insulated transformer has been developed, and the transformer and the gas-insulated switchgear can be arranged in the same room. Therefore, further reduction in installation area and volume is required.

This point will be specifically described with reference to the drawings. FIG. 6 shows an example of the arrangement configuration of each device in a conventional gas insulated substation. In FIG. 6, a plurality of machine rooms 52, which are partitioned by fire by partition walls 51, are provided in a building 50, and a passage 53 for loading and unloading devices is provided between the machine rooms 52. In each machine room 52, oil-filled transformers 54a and 54b are individually installed, and the gas-insulated switchgear 55 also has a partition wall 5 for each unit.
It was installed in each machine room 52 divided by 1.

[0004]

As described above, in the conventional underground substation, the oil-filled transformers 54a and 54b and the gas-insulated switchgear 55 are arranged in different rooms, so that a large installation area and volume are required. It was. In particular, if the two are placed in different rooms, there is a problem in that the entire building will inevitably become large, because a dedicated loading / unloading space and maintenance / inspection space are required around each device. .

Recently, it has been proposed to arrange the gas-insulated switchgear and the transformer in the same room by the development of the gas-insulated transformer, but in reality, it is difficult to directly connect the both. The advent of an underground substation that can efficiently arrange both in a small installation space has been desired.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and its object is to provide a gas-insulated switchgear and a transformer in a substation located underground or indoors. By placing the vessel and the same room,
The transformer and the gas-insulated switchgear share the loading / unloading space and maintenance / inspection space to enable reduction of the installation area and volume.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 provides a gas-insulated transformer in which windings of each phase are enclosed in different tanks, and this gas-insulated transformer. In a gas-insulated substation in which a gas-insulated switchgear is connected to at least one terminal on the primary side or secondary side of
Arranging each phase tank of the gas insulation transformer on a substantially straight line,
The tap changer of the gas insulation transformer is located on one side of the tank in each phase, and the cooling device for cooling the insulation gas inside the gas insulation transformer is located on the opposite side. A shaft that connects the center of each phase tank of the gas-insulated transformer with the gas-insulated switchgear being arranged at the end of each phase tank of the gas-insulated transformer in the arranging direction Parallel to the main bus bar, and the devices that form a line circuit in the direction orthogonal to the axial direction of the main bus bar are arranged, and the main bus bar and the primary side or secondary side terminal of the gas insulation transformer are connected to the gas line. It is characterized in that they are connected by an insulating bus.

According to a second aspect of the present invention, each phase tank of the gas insulated transformer is formed by a cylindrical tank, and the central axis of the tank is arranged to be perpendicular to the installation surface of the tank. And

According to a third aspect of the present invention, a gas-insulated transformer in which windings for each phase are enclosed in the same tank, and a gas-insulated switch is provided at at least one of the terminals on the primary side or the secondary side of the gas-insulated transformer. In a gas-insulated substation connected with equipment,
The tank of the gas-insulated transformer is constituted by a tank long in one direction in which three-phase windings are housed in a substantially straight line, and the gas-insulated transformer is provided on one side when viewed from the longitudinal direction of the tank. The tap changer is arranged, and a cooling device for cooling the insulating gas inside the gas insulation transformer is arranged on the opposite side, and the gas insulation switchgear is connected to the longitudinal end of the tank of the gas insulation transformer. , The main bus line that constitutes this gas-insulated switchgear is placed parallel to the axis that connects the centers of the tanks of the gas-insulated transformer, and the line circuit is extended from this main bus line in the direction orthogonal to the axial direction of the main bus line. The constituent devices are arranged, and the main busbar and the primary side or secondary side terminal of the gas insulated transformer are connected by a gas insulated busbar.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the gas insulated switchgear is connected to both the primary side and secondary side terminals of the gas insulated transformer.
Further, it is characterized in that two gas-insulated switchgear connected to the primary side and the secondary side are arranged at both ends of the tank of the gas-insulated transformer across the tank.

[0011]

In the invention of the first aspect having the above-mentioned structure, since the tap changer and the cooling device are provided on the side of the arrangement direction of the phase tanks of the transformer, the phase tanks of the transformer are provided. A space will be left at the end of the arrangement direction of. As a result, it is possible to install the gas-insulated switchgear that constitutes the line circuit of the transformer close to the end of each phase tank of the transformer in the direction in which the transformer and the gas-insulated switchgear are integrated. Will be placed.

In the invention of claim 2, even when each phase tank is constituted by a cylindrical tank, the same operation as that of the invention of claim 1 is achieved.

According to the third aspect of the present invention, since the tap changer and the cooling device are provided laterally in the longitudinal direction of the transformer tank in which the three-phase windings are accommodated, the longitudinal end of the transformer tank is provided. Space will be left in the department. As a result, it becomes possible to provide the gas-insulated switchgear that constitutes the line circuit of the transformer close to the longitudinal end of the transformer tank.

In the invention of claim 4, the gas insulated switchgear on the primary side is provided at one end of each phase tank in the arrangement direction or one end in the longitudinal direction of the transformer tank, and the other is provided at the other end. A gas insulated switchgear on the secondary side is provided. Therefore, the spaces provided at both ends of each phase tank or the transformer tank can be effectively used as the installation space for the gas insulated switchgear.

[0015]

【Example】

(1) First Embodiment FIG. 1, FIG. 2 This first embodiment corresponds to the invention of claim 1,
A substation is constituted by a gas-insulated transformer and a gas-insulated switchgear in which windings of each phase are enclosed in different tanks. Further, the switchgear connected to the primary side terminal of the gas insulated transformer is constituted by the gas insulated switchgear.

That is, in FIG. 1, 30 is a room in which a substation is installed, 31 is a wall thereof, and 32 is a pillar. The gas insulation transformer 1 is installed inside the room 30. This gas-insulated transformer 1 has three tanks 2a to 2c, and windings of each phase are housed in each tank. The three tanks 2a to 2c are arranged side by side on a substantially straight line. A tap selector 3, a switching switch 4, a primary neutral point terminal 5 and a primary side terminal 6 are provided on one side surface of the tank in the arrangement direction, and the insulating gas in each tank is provided on the opposite side surface. A cooling device 7 and a secondary side terminal 8 are provided for cooling the. These devices and each tank are connected by gas insulated wires and ducts.

In the same room as the room 30, a gas-insulated switchgear 10 is provided close to the gas-insulated transformer 1. In the first embodiment, this gas insulated switchgear 10
Employs a three-phase batch type device in which conductors and switchgear for three phases are enclosed together with insulating gas in the same grounded metal container. This gas-insulated switchgear 10 is constructed in a single bus system having one main bus 11. The axis of the main bus 11 is parallel to the axis connecting the centers of the phase tanks 2a to 2c of the gas insulated transformer 1. It is arranged. From this main bus 11,
As an example, two line lines 12a and 12b and one transformer line 20 are drawn out. In this case, the first
In the embodiment, the width L of the gas-insulated switchgear 10 including the line circuits 12a and 12b is smaller than the width W of the gas-insulated switchgear 1, and between the end of the gas-insulated switchgear 10 and the pillar 32 of the building. , Gas-insulated transformer 1 or gas-insulated switchgear 10
A carrying-in / carrying-out space 34 for the devices constituting the above is formed.

The line lines 12a and 12b are the main bus 1
The respective constituent devices are arranged so that the two line lines are parallel to each other in a direction intersecting with 1 at a right angle. That is,
As shown in the plan view of FIG. 1 and the side view of FIG. 2, this line circuit includes a vertical circuit breaker 13 arranged on the side of the main bus bar 11, a disconnector 14 provided above the main bus bar 11, Above the main busbar 11, the current transformer 15a arranged to connect the lower outlet of the circuit breaker 13 and the disconnector 14, the current transformer 15b connected to the upper outlet of the circuit breaker 13, and the main bus 11. Ground switch 1 arranged and connected to the current transformer 15b
6, a transformer 17 for instruments arranged on the opposite side of the circuit breaker 13 with the main bus 11 in between, and a cable head 18 for drawing out a line. Each of these devices is connected by a gas-insulated connecting bus bar so that its charging section is not exposed to the outside.

A transformer line 20 is connected to the end of the main bus 11 on the transformer 1 side. This transformer line 20 is connected to a terminal 6 on the primary side of the transformer 1 via a gas-insulated bus bar 21 and a cable head 22.
Although not shown, the transformer circuit 20 is provided with a grounding switch and an instrument transformer, as in a conventionally known transformer circuit.

According to the first embodiment having such a configuration, it is possible to dispose the gas-insulated switchgear and the gas-insulated transformer close to each other in the same room of the building, so that both are installed in different rooms. Compared with the conventional substation, the space occupied by the equipment is reduced to each stage. Particularly, in the first embodiment, in addition to the reduction of the space occupied by the equipment itself, the carry-in, carry-out space, maintenance, and inspection space required around the gas-insulated switchgear and the gas-insulated transformer are shared. From that point as well, the reduction of the occupied space in the room is remarkable.
Further, by disposing the main busbars 11 on the end side of the tanks which are parallel to the axial direction connecting the centers of the respective tanks and arranged side by side, the main busbars 11 and the line circuits 12a, 1 drawn from them
2b does not interfere with the tap selector 3 arranged on the side of the gas insulated transformer 1 or the cooling device 7 on the opposite side. Further, since the width of the gas insulated switchgear, that is, the total length L of the equipment constituting the line circuit drawn from the main busbar is generally smaller than the width W of the gas insulated transformer, the gas insulated transformer as in the present embodiment. The dead space that occurs when the gas insulated switchgear is installed
It can be used as the carry-out path 34, and the utilization efficiency of the building space is also improved.

(2) Second Embodiment FIG. 3 This embodiment corresponds to the invention of claim 2 and each of the phase tanks 2a to 2c of the gas insulation transformer is constituted by a cylindrical tank. Except for this, the configuration is similar to that of the first embodiment. According to this second embodiment, since the tank is cylindrical, the width of the entire gas-insulated transformer is smaller than that of the first embodiment having an oval shape. By arranging the selector 3 and the cooling device 7 and arranging the gas-insulated switchgear at the end portion, it is possible to secure the loading / unloading path 34 for the equipment.

(3) Third Embodiment FIG. 4 This embodiment corresponds to the invention of claim 3, and as the transformer tank 2, windings for three phases are lined up and stored in a row. It is an example using an elongated tank. Also in the third embodiment, the tap selector 3 and the cooling device 7 are arranged on both sides of the transformer tank 2 in the longitudinal direction, and the gas-insulated switchgear is arranged at the end of the transformer tank 2.
4 can be secured.

(4) Fourth Embodiment FIG. 5 This embodiment corresponds to the invention of claim 4, in which a gas-insulated switchgear is provided at each of the primary and secondary terminals of the gas-insulated transformer. It is connected. In the fourth embodiment, the gas insulation switchgear 10-1 on the primary side is provided at one end of the three-phase tanks 2a to 2c in the arrangement direction, and the gas insulation switchgear on the secondary side is provided at the other end. A device 10-2 is provided. Each gas-insulated switchgear 10-1, 10-2 and the cable heads 6, 8 on the primary and secondary sides of the gas-insulated transformer
Are connected to each other by a gas-insulated bus bar 21.

In the fourth embodiment, although the gas-insulated switchgear is connected to both the primary and secondary terminals of the gas-insulated transformer, both gas-insulated switchgears are connected to the gas-insulated transformer. Fits within the width of. Therefore, it is possible to secure the carry-in / carry-out path 34 of the device while reducing the size of the entire substation.

[0025]

According to the present invention, the occupied space can be reduced by a simple means of appropriately disposing the tap changer, the cooling device, and the gas insulated switchgear around the tank of the transformer, and further, the equipment can be reduced. It is possible to provide a gas-insulated substation capable of ensuring a carry-in / carry-out path.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a side view of a gas-insulated switchgear portion according to the first embodiment of the present invention.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a plan view of a third embodiment of the present invention.

FIG. 5 is a plan view of a fourth embodiment of the present invention.

FIG. 6 is a plan view showing an example of a conventional gas insulated substation.

[Explanation of symbols]

 1 ... Gas insulated transformer 2, 2a-2c ... Transformer tank 3 ... Tap selector 4 ... Switching switch 6 ... Primary side terminal 7 ... Cooling device 8 ... Secondary side terminal 10 ... Gas insulated switchgear 11 ... Main busbar 12a, 12b ... Line circuit 20 ... Transformer line 34 ... Carrying in / out equipment

Claims (4)

[Claims] 1. A gas-insulated transformer in which windings for each phase are enclosed in separate tanks, and a gas-insulated switchgear is connected to at least one of the terminals on the primary side or the secondary side of the gas-insulated transformer. In a gas-insulated substation, the tanks for each phase of the gas-insulated transformer are arranged in a substantially straight line,
The tap changer of the gas insulation transformer is located on one side of the tank in each phase, and the cooling device for cooling the insulation gas inside the gas insulation transformer is located on the opposite side. The gas-insulated switchgear is arranged at the end of each phase tank of the gas-insulated transformer in the arrangement direction, and the main bus line constituting the gas-insulated switchgear is connected to the center of each phase tank of the gas-insulated transformer. Parallel to the main bus bar, and the devices that form a line circuit in the direction orthogonal to the axial direction of the main bus bar are arranged, and the main bus bar and the primary side or secondary side terminal of the gas insulation transformer are connected to the gas line. A gas-insulated substation characterized by being connected by an insulating busbar. 2. The tank of each phase of the gas-insulated transformer is formed by a cylindrical tank, and the central axis of the tank is arranged to be perpendicular to the installation surface of the tank. Gas-insulated substation as described. 3. A gas-insulated transformer in which windings for each phase are enclosed in the same tank, and a gas-insulated switchgear is connected to at least one of the terminals on the primary side or the secondary side of the gas-insulated transformer. In the gas-insulated substation, the tank of the gas-insulated transformer is constituted by a tank that is long in one direction and in which three-phase windings are housed in a substantially straight line, and one side when viewed from the longitudinal direction of the tank. A tap changer of the gas insulation transformer is arranged in the section, a cooling device for cooling the insulation gas inside the gas insulation transformer is arranged in the opposite side, and the gas insulation switchgear is connected to the gas insulation transformer. It is arranged at the end of the tank in the longitudinal direction, and the main bus line that constitutes this gas-insulated switchgear is placed parallel to the axis that connects the center of the tank of the gas-insulated transformer, and from this main bus line to the axial direction of the main bus line. Machines that configure line circuits in orthogonal directions It was placed, the gas insulated substation to the terminal of the main bus and the primary side or secondary side of the gas-insulated transformer, characterized in that connected by a gas-insulated bus. 4. The gas-insulated switchgear is connected to both primary and secondary terminals of a gas-insulated transformer, and two gas-insulated switchgear connected to the primary side and the secondary side are gas The insulating transformer is arranged at both ends of the tank with the tank interposed therebetween.
Gas-insulated substation as described.