220kV overhead outgoing line structure of all-indoor station

Abstract

The utility model provides an all-indoor station 220kV overhead outgoing line structure, and relates to the technical field of transformer station power transmission, an outgoing line framework is erected on the top of a main transformer chamber, the outgoing line framework is provided with vertical supporting rods, a supporting upper cross beam and a supporting lower cross beam, the supporting upper cross beam and the supporting lower cross beam are both supported by the vertical supporting rods, and the supporting upper cross beam and the supporting lower cross beam are connected through the vertical supporting rods. A height difference exists between the height positions of the upper supporting cross beam and the lower supporting cross beam so as to form a vertical electrical interval; the supporting upper cross beam and the supporting lower cross beam are respectively provided with a plurality of outgoing line terminals, each outgoing line terminal can provide one-phase outgoing line of a three-phase circuit, a plurality of three-phase outgoing lines are arranged in the length direction of the supporting upper cross beam and the length direction of the supporting lower cross beam, and the outgoing line direction is perpendicular to the length direction of the supporting upper cross beam and the length direction of the supporting lower cross beam. The three outgoing line terminals of the three-phase circuit are not on the same horizontal plane, the outgoing line heights of two phases are the same, the other phase is located at the independent height, and the effect of reducing the width of an outgoing line framework is achieved in a vertical height space arrangement mode.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission of transformer substations, and further relates to a 220kV overhead outgoing line structure for a full indoor station. Background Art

[0002] With the continuous advancement of power grid upgrades and the continuous increase in load density, 220kV substations are getting closer and closer to load centers. Due to urban planning restrictions in the central areas of first- and second-tier cities, it is difficult to select outdoor substations, mainly due to the high land acquisition and earthwork costs. In order to reduce land acquisition and earthwork costs and respond to green environmental protection requirements, more and more 220kV substations near the city center are choosing fully indoor types.

[0003] The fully indoor substation, the main transformer and all high and low voltage electrical equipment are arranged indoors. This type of substation reduces the total floor space and has the characteristics of being compact, with large height differences and different floor height requirements, making it easy to meet the surrounding landscape requirements.

[0004] In the conventional 220kV indoor station layout, the 220kV distribution device overhead outgoing line adopts a straight line layout, and the conventional 220kV overhead outgoing line width is 13m / span or 25m / 2spans to meet the electrical clearance requirements. The conventional 220kV GIS (GasInsulated Switchgear, gas-insulated fully enclosed switchgear) is spaced 2.4m apart. Taking the final scale of 6 lines and 3 transformers, double busbar wiring as an example, there are a total of 12 bays. Considering the location of the expansion end of the distribution device building, a width of about 38m is required, and the 6 overhead bays require a building of at least 75m. That is, the building width of the 220kV indoor station cannot meet the requirements of conventional overhead line-out methods. There are two solutions. The first is to increase the width of the building to meet the requirements of all overhead line-outs. This solution will increase the volume of the building and the area occupied by the substation, and the corresponding engineering volume such as earthwork slopes will also increase accordingly, and the investment cost will increase significantly; the second is to adopt a partial overhead + cable mixed line-out method. The cable line-out method has a significantly higher investment than the overhead line-out method, and the operation and maintenance difficulty is also greater than the overhead line-out method.

[0005] For those skilled in the art, how to reduce the space occupied by the outgoing lines of the entire indoor station is a technical problem that needs to be solved at present. Utility Model Content

[0006] The utility model provides a 220kV overhead outgoing line structure for a fully indoor station, which utilizes the height space to reduce the frame width of the outgoing line and reduce the space occupied by the outgoing line of the fully indoor station. The specific scheme is as follows:

[0007] A 220kV overhead outgoing line structure for an all-indoor substation, including an outgoing line framework erected on the top of the main transformer room. The outgoing line framework is provided with vertical support rods, a support upper crossbeam and a support lower crossbeam. The support upper crossbeam and the support lower crossbeam are both supported by the vertical support rods, and there is a height difference between the positions of the support upper crossbeam and the support lower crossbeam to form a vertical electrical interval.

[0008] A number of outgoing line terminals are respectively provided on the support upper crossbeam and the support lower crossbeam. A number of three-phase outgoing lines are arranged along the length directions of the support upper crossbeam and the support lower crossbeam, and the outgoing direction is perpendicular to the length directions of the support upper crossbeam and the support lower crossbeam.

[0009] Optionally, the number of three-phase outgoing lines arranged by the outgoing line framework is in an inverted "pin" shape with two on the top and one on the bottom, or in a "pin" shape with one on the top and two on the bottom.

[0010] Optionally, the support upper crossbeam and the support lower crossbeam are respectively provided with a number of segments, and each segment is supported by two of the vertical support rods; two adjacent segments share the same vertical support rod.

[0011] Optionally, the length of each segment of the support upper crossbeam and the support lower crossbeam is equal to the length of the main transformer room, and the vertical support rods are fixed above the side walls of the main transformer room.

[0012] Optionally, the vertical support rods are fixed at the middle position in the width direction of the main transformer room.

[0013] Optionally, a ground wire support rod is provided at the top of the vertical support rod, and the ground wire support rod is provided with an outgoing line terminal for ground wire outgoing.

[0014] Optionally, the vertical support rod includes a first inclined rod, a second inclined rod and a transverse connecting rod. The tops of the first inclined rod and the second inclined rod are relatively fixed, and the bottoms are fixed to the main transformer room; the transverse connecting rod is fixed to the first inclined rod and the second inclined rod.

[0015] Optionally, both the support upper crossbeam and the support lower crossbeam are triangular trusses.

[0016] Optionally, a reinforcing inclined rod is fixedly arranged on the edge vertical support rod, and the bottom of the reinforcing inclined rod is fixed to the roof of the secondary equipment room.

[0017] Optionally, spacer terminals are respectively provided on the support upper crossbeam and the support lower crossbeam, and the spacer terminals are used to define the intervals of the lines.

[0018] The utility model provides a 220kV overhead outgoing line structure for a fully indoor station. An outgoing line frame is erected on the top of a main transformer room. The outgoing line frame is provided with a vertical support rod, an upper supporting beam and a lower supporting beam. Both the upper supporting beam and the lower supporting beam are supported by the vertical support rod, and there is a drop in the height positions of the upper supporting beam and the lower supporting beam to form a vertical electrical interval. The upper supporting beam and the lower supporting beam are respectively provided with a plurality of outgoing line terminals, each of which can provide an outgoing line of one phase of a three-phase circuit. A plurality of three-phase outgoing lines are arranged along the length direction of the upper supporting beam and the lower supporting beam, and the outgoing line direction is perpendicular to the length direction of the upper supporting beam and the lower supporting beam. The three outgoing line terminals of the three-phase circuit are not on the same horizontal plane, wherein the heights of two-phase outgoing lines are equal, and the other phase is located at a separate height, and the effect of reducing the frame width of the outgoing line is achieved by arranging the vertical height space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a front view schematic diagram of the 220kV overhead outgoing line structure of the fully indoor station provided by the utility model;

[0021] Figure 2 A side view schematic diagram of the 220kV overhead outgoing line structure of the fully indoor station provided by the utility model;

[0022] Figure 3 The utility model provides a 220kV overhead line structure for an indoor station.

[0023] The figure includes:

[0024] Outgoing line frame 1, vertical support rod 11, first diagonal rod 111, second diagonal rod 112, transverse connecting rod 113, supporting upper crossbeam 12, supporting lower crossbeam 13, ground wire support rod 14, reinforcing diagonal rod 15, outgoing line terminal 2, main transformer room 3, secondary equipment room 4, interval terminal 5. DETAILED DESCRIPTION

[0025] The core of the utility model is to provide a 220kV overhead outgoing line structure for a fully indoor station, which utilizes the height space to reduce the frame width of the outgoing line and reduces the space occupied by the outgoing line of the fully indoor station.

[0026] In order to enable those skilled in the art to better understand the technical effects of the present invention, the 220kV overhead line structure of the fully indoor station of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The utility model provides a 220kV overhead outgoing line structure for a fully indoor station, comprising an outgoing line frame 1 erected on the top of a main transformer room 3, wherein a main transformer is installed in the main transformer room 3, and the main transformer is a total step-down transformer mainly used for power transmission and transformation in a transformer substation, and is also the core part of the transformer substation, and the outgoing line frame 1 is erected on the roof of the main transformer room 3. The outgoing line frame 1 extends upward, and the outgoing line position is higher than the roof of the main transformer room 3.

[0028] The outgoing line frame 1 is provided with a vertical support rod 11, a support upper beam 12 and a support lower beam 13. The top of the vertical support rod 11 is fixed to the roof of the main transformer room 3. The support upper beam 12 and the support lower beam 13 are both supported by the vertical support rod 11. The support upper beam 12 and the support lower beam 13 are both extended horizontally, and the support upper beam 12 and the support lower beam 13 are arranged parallel to each other. The position of the support upper beam 12 is higher than the position of the support lower beam 13. There is a height difference between the support upper beam 12 and the support lower beam 13 to form a vertical electrical spacing. The electrical spacing can be formed by using the vertical height spacing of the support upper beam 12 and the support lower beam 13.

[0029] A plurality of outlet terminals 2 are respectively provided on the upper support beam 12 and the lower support beam 13. The outlet terminals 2 are used to lead out cables, and each cable is led outward through the outlet terminals 2. One three-phase outlet line has three cables, including phase A, phase B, and phase C. The three cables are led out from the upper support beam 12 and the lower support beam 13. A plurality of three-phase outlet lines are arranged along the length direction of the upper support beam 12 and the lower support beam 13, that is, one phase of a three-phase circuit is led out from the upper support beam 12 or the lower support beam 13, and the other two phases are led out from the lower support beam 13 or the upper support beam 12. The outlet line direction is perpendicular to the length direction of the upper support beam 12 and the lower support beam 13, such as Figure 2 As shown, the length directions of the supporting upper beam 12 and the supporting lower beam 13 are perpendicular to the paper surface, the cable outlet direction is toward the left side, and the cable is perpendicular to the supporting upper beam 12 and the supporting lower beam 13 in space.

[0030] The utility model utilizes the support upper crossbeam 12 and the support lower crossbeam 13 to form a gap in the height direction, so that the three-phase outgoing lines are no longer located at the same height, a height difference is formed between one phase and the other two phases, and the height space is utilized to form an insulating gap, thereby reducing the space for one phase outgoing line and reducing the frame width of the outgoing line.

[0031] Based on the above solution, several three-phase outgoing lines of the outgoing line framework 1 of the present utility model are arranged in an inverted "pin" shape with two on the top and one on the bottom, or in a "pin" shape with one on the top and two on the bottom. The inverted "pin" shape arrangement means that two outgoing lines are arranged on the supporting upper crossbeam 12 and one outgoing line is arranged on the supporting lower crossbeam 13; the "pin" shape arrangement means that one outgoing line is arranged on the supporting upper crossbeam 12 and two outgoing lines are arranged on the supporting lower crossbeam 13. Since the supporting upper crossbeam 12 and the supporting lower crossbeam 13 extend in parallel and their lengths are approximately equal, the common practice is that multiple three-phase outgoing lines are all arranged in a regular "pin" shape, or multiple three-phase outgoing lines are all arranged in an inverted "pin" shape. Of course, if necessary, the regular "pin" shape arrangement and the inverted "pin" shape arrangement can also be alternately arranged at intervals.

[0032] Combined with Figure 1 、 Figure 3 As shown, the supporting upper crossbeam 12 and the supporting lower crossbeam 13 are respectively provided with several segments, and each segment is supported by two vertical support rods 11. Among them, two adjacent segments share the same vertical support rod 11. The part between two adjacent vertical support rods 11 is one span, and the supporting upper crossbeam 12 and the supporting lower crossbeam 13 are respectively composed of multiple-span structures.

[0033] Specifically, the length of each segment of the supporting upper crossbeam 12 and the supporting lower crossbeam 13 is equal to the length of the main transformer chamber 3, that is, the length of each span of the supporting upper crossbeam 12 and the supporting lower crossbeam 13 is equal to the length of the main transformer chamber 3. The vertical support rod 11 is fixed above the side wall of the main transformer chamber 3, and the weight borne by the vertical support rod 11 is transmitted downward to the side wall of the main transformer chamber 3, avoiding directly applying pressure to the surface of the roof and helping to improve the structural strength.

[0034] Combined with Figure 2 As shown, the vertical support rod 11 is fixed at the middle position in the width direction of the main transformer chamber 3, with a certain distance from the left and right edges, which is convenient for operators to set up operations on the roof.

[0035] Combined with Figure 2 As shown, a ground wire support rod 14 is provided at the top of the vertical support rod 11. The ground wire support rod 14 is provided with an outgoing line terminal 2 for the ground wire to go out. The ground wire support rod 14 is higher than the supporting upper crossbeam 12. Multiple three-phase outgoing lines can share the ground wire, so only the ground wire outgoing line needs to be set at the position of the vertical support rod 11.

[0036] Specifically, the vertical support rod 11 includes a first oblique rod 111, a second oblique rod 112 and a transverse connecting rod 113. The first oblique rod 111 and the second oblique rod 112 are arranged axially symmetrically. The top ends of the first oblique rod 111 and the second oblique rod 112 are relatively fixed, and the bottom ends are fixed to the main transformer chamber 3, forming an isosceles triangle structure. The transverse connecting rod 113 is fixed to the first oblique rod 111 and the second oblique rod 112 to improve the structural strength of the first oblique rod 111 and the second oblique rod 112.

[0037] The upper cross beam 12 and the lower cross beam 13 provided in the utility model are both triangular trusses, and three long rods are respectively arranged, so that the cross sections of the upper cross beam 12 and the lower cross beam 13 are equilateral triangles. A plurality of oblique rods are respectively fixed between the three long rods to improve the strength.

[0038] Combination Figure 1 As shown, the vertical support rod 11 at the edge is fixedly provided with a reinforcing diagonal rod 15 , and the bottom of the reinforcing diagonal rod 15 is fixed to the roof of the secondary equipment room 4 to strengthen the lateral support strength of the entire outgoing line frame 1 .

[0039] Based on any of the above technical solutions and their combinations, the upper support beam 12 and the lower support beam 13 are respectively provided with spacing terminals 5, and the spacing terminals 5 are used to limit the spacing of the lines to prevent the upper support beam 12 and the lower support beam 13 of the cable line from being too close to each other, so as to form a certain electrical spacing. Figure 2 As shown, a phase outgoing line arranged on the supporting upper crossbeam 12 needs to be limited by two spaced terminals 5, wherein the two spaced terminals 5 are respectively located on the supporting upper crossbeam 12 and the supporting lower crossbeam 13; a phase outgoing line arranged on the supporting lower crossbeam 13 needs to be limited by one spaced terminal 5, and the spaced terminal 5 is located on the supporting lower crossbeam 13.

[0040] The utility model proposes a 220kV outgoing line form, which can increase the number of overhead outgoing lines by 1 / 3 without changing the width of the building; the roof of the 220kV main transformer room is used as an outgoing line platform, the width of the main transformer room + the radiator room is 19m~19.5m, and a roof double-layer beam frame is set up on the roof of the main transformer room as a 220kV overhead outgoing line frame, that is, the width of a main transformer room of 19m~19.5m is just as the width of two "reverse T-shaped" outgoing lines of 220kV.

[0041] If the conventional overhead line-out scheme is adopted, the width of the building can only meet the requirements of 4 overhead lines. In this project, the roof of the main transformer room is innovatively used as the line-out platform. The 220kV line-out frame is installed on the roof of the main transformer room. The line-out frame is the same width as the main transformer room, with a width of 19~19.5m. The 220kV line-out adopts an "inverse T-shaped" line-out, that is, a frame width of 19~19.5m ensures 2 lines. The utility model arranges the line-out crossbeam of the 220kV distribution device into two layers, the B-phase line-out is led out through the lower crossbeam, and the A and C-phase line-out is led out through the cross-arm insulators set on the lower crossbeam, so that the three-phase line-out is arranged in an inverse T-shaped shape in space, and the effect of reducing the width of the frame of the line-out is achieved by arranging the wires in space. This technology can reduce the width of the outgoing line frame from the commonly used 25m / 2 circuits to 19.5m / 2 circuits. After adopting this solution, the scale of overhead outgoing lines can be increased to 6 circuits, and the horizontal dimensions of the roof platform can be fully utilized to arrange the overhead outgoing lines, avoiding the installation of cable shafts and reducing project investment by 5% to 10%.

[0042] In summary, the 220kV outgoing line in the 220kV fully indoor station of the utility model uses the roof of the main transformer as the outgoing line platform, which can greatly reduce the longitudinal size of the indoor station compared to using the outdoor open space of the building as the outgoing line platform. The overhead outgoing line frame of the 220kV fully indoor station is as for the roof of the main transformer room, and the frame width is consistent with the width of the main transformer room. The 220kV outgoing line adopts a "pin" shape or a reverse "pin" shape outgoing line, which can ensure that the width of a single main transformer room guarantees 2 220kV overhead outgoing lines. As for the use of "pin" shape or reverse "pin" shape outgoing line, it can be determined according to the actual situation of the project. In the indoor station plan of 3 main transformers or 4 main transformers, the scale of 2 overhead outgoing lines can be increased without increasing the width of the building. This solution can be widely applied to the 220kV fully indoor station plan and the situation where the outgoing line corridor is not restricted, and its application can save a lot of land resources. Compared with the traditional outlet solution, under the same scale, the utility model has better economy and reliability.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A 220kV overhead outgoing line structure for a fully indoor station, characterized in that: It includes an outgoing line framework (1) erected on the top of the main transformer chamber (3). The outgoing line framework (1) is provided with vertical support rods (11), a support upper crossbeam (12) and a support lower crossbeam (13). The support upper crossbeam (12) and the support lower crossbeam (13) are both supported by the vertical support rods (11), and there is a height difference between the height positions where the support upper crossbeam (12) and the support lower crossbeam (13) are located to form a vertical electrical interval. A number of outgoing line terminals (2) are respectively provided on the support upper crossbeam (12) and the support lower crossbeam (13). A number of three-phase outgoing lines are arranged along the length direction of the support upper crossbeam (12) and the support lower crossbeam (13), and the outgoing direction is perpendicular to the length direction of the support upper crossbeam (12) and the support lower crossbeam (13).

2. The 220kV overhead line structure for the fully indoor station according to claim 1 is characterized in that: The number of three-phase outgoing lines arranged by the outgoing line framework (1) is in an inverted "pin" shape with two on the top and one on the bottom, or in a "pin" shape with one on the top and two on the bottom.

3. The 220kV overhead line structure for the fully indoor station according to claim 1 is characterized in that: The support upper crossbeam (12) and the support lower crossbeam (13) are respectively provided with a number of segments, and each segment is supported by two of the vertical support rods (11); two adjacent segments share the same vertical support rod (11).

4. The 220kV overhead line structure for the fully indoor station according to claim 3 is characterized in that: The length of each segment of the support upper crossbeam (12) and the support lower crossbeam (13) is equal to the length of the main transformer chamber (3), and the vertical support rods (11) are fixed above the side wall of the main transformer chamber (3).

5. The 220kV overhead line structure for the fully indoor station according to claim 4 is characterized in that: The vertical support rods (11) are fixed at the middle position in the width direction of the main transformer chamber (3).

6. The 220kV overhead line structure for the fully indoor station according to claim 3 is characterized in that: A ground wire support rod (14) is arranged at the top of the vertical support rod (11), and the ground wire support rod (14) is provided with an outgoing line terminal (2) for ground wire outgoing.

7. The 220kV overhead line structure for the fully indoor station according to claim 1 is characterized in that: The vertical support rod (11) includes a first inclined rod (111), a second inclined rod (112) and a transverse connecting rod (113). The tops of the first inclined rod (111) and the second inclined rod (112) are relatively fixed, and the bottoms are fixed to the main transformer chamber (3); the transverse connecting rod (113) is fixed to the first inclined rod (111) and the second inclined rod (112).

8. The 220kV overhead outgoing line structure for the fully indoor station according to claim 1 is characterized in that: Both the support upper crossbeam (12) and the support lower crossbeam (13) are triangular trusses.

9. The 220kV overhead outgoing line structure for the fully indoor station according to claim 1 is characterized in that: The vertical support rods (11) at the edge are fixedly provided with strengthening inclined rods (15), and the bottoms of the strengthening inclined rods (15) are fixed to the roof of the secondary equipment chamber (4).

10. The 220kV overhead line structure for indoor stations according to any one of claims 1 to 9, characterized in that: The support upper crossbeam (12) and the support lower crossbeam (13) are respectively provided with spacer terminals (5), and the spacer terminals (5) are used to define the intervals of the lines.

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