Single circuit transmission crossing tower and crossing system

Abstract

The application discloses a single-circuit power transmission crossing tower, which comprises a tower body, a wire cross arm arranged in the middle of the tower body, and a communication ground wire connected to the non-crossing side of the tower body. The middle ground wire hanging point is arranged on the wire cross arm corresponding to the middle part of the tower body and towards the crossing side. The lightning protection bracket is arranged on the top of the tower. The ground wire height in the crossing side is significantly reduced compared with the non-crossing side, so that the ground wire and the wire in the crossing side are approximately on the same horizontal plane. This arrangement greatly compresses the vertical distance between the wire and the ground wire in the crossing side to the minimum, so that the crossing line meets the safety distance of the crossed line, and is more easily to meet the safety distance of the ground wire of the crossing line to the ground, effectively improving the feasibility of the power transmission line crossing.

Description

Technical Field

[0001] This invention relates to the field of transmission line tower technology, and in particular to a single-circuit transmission crossing tower and crossing system. Background Technology

[0002] Overhead transmission lines typically span several kilometers or even tens of kilometers. Different overhead transmission lines in the same area frequently intersect. When an intersection occurs, the lower-voltage line must pass downwards under the higher-voltage line. In specific engineering projects, crossing a transmission line requires meeting both electrical safety distances with the line being crossed and with the ground. If the clearance between the crossed transmission line and the ground is small, the crossing transmission line may fail to meet the electrical safety distance requirement even while maintaining the electrical distance with the crossed line, leading to difficulties in crossing. Choosing a different crossing location or raising the height of the crossed transmission line inevitably increases project investment. For transmission lines with a unique crossing point, how to ensure that the crossing transmission line simultaneously meets both the safety distance requirements with the crossed line and the electrical safety distance requirement with the ground without altering the crossed transmission line, thereby improving project economy, is a pressing issue in this field.

[0003] To make it easier to meet the relevant electrical distance requirements when crossing power transmission lines, while ensuring the continuity of communication lines, we designed a single-circuit power transmission tower. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To achieve the above objectives, this invention proposes a single-circuit transmission crossing tower, comprising a tower body, a conductor crossarm disposed in the middle of the tower body, one side of the tower body perpendicular to the direction of the single-circuit conductor being a crossing span and the other side being a non-crossing span, a grounding point disposed on the top of the tower body facing the non-crossing span for connecting the communication ground wire to the non-crossing span, a central grounding point disposed on the conductor crossarm corresponding to the middle position of the tower body and facing the crossing span for transferring the communication ground wire to the crossing span side, multiple sets of conductor hanging points disposed on the conductor crossarm for connecting the conductor from the non-crossing span to the crossing span, and a lightning protection bracket disposed on the top of the tower.

[0006] This invention places the ground wire suspension point at the same horizontal level as the conductor suspension point, significantly reducing the height of the ground wire within the crossing span compared to non-crossing spans. This makes the ground wire and conductor within the span approximately at the same horizontal plane. This configuration greatly compresses the vertical distance between the conductor and ground wire within the crossing span to a minimum, ensuring that the crossing line meets the safety distance requirements for both the line being crossed and the conductor of the crossing line to the ground, effectively improving the feasibility of transmission line crossings.

[0007] Optionally, the conductor crossarm is located on both sides of the tower body as a left crossarm and a right crossarm. The conductor suspension points include a left conductor suspension point symmetrically arranged on the left crossarm on both the crossing and non-crossing sides, and a middle conductor suspension point and a right conductor suspension point symmetrically arranged on the right crossarm on both the crossing and non-crossing sides in a direction away from the tower body. Tension insulator strings are installed on the left conductor suspension point, the middle conductor suspension point, and the right conductor suspension point.

[0008] Furthermore, the left conductor hanging point, the middle conductor hanging point, and the right conductor hanging point are on the same horizontal plane, and the distance between them meets the electrical distance requirements between conductors.

[0009] Furthermore, the grounding point includes a left grounding point and a right grounding point. The left grounding point and the right grounding point are symmetrically arranged at both ends of the top of the tower body. The left grounding point and the right grounding point are connected to the middle grounding point through a communication grounding lead-out line.

[0010] Furthermore, the central ground wire suspension point is set on the same horizontal plane as the left conductor suspension point, the middle conductor suspension point, and the right conductor suspension point. The communication ground wire on the crossing side is at the same horizontal position as the conductor loop on the crossing side. The distance between the central ground wire suspension point and the left and right conductor suspension points on the conductor crossarm crossing side meets the electrical distance requirements between the communication ground wire and the conductor.

[0011] Furthermore, the lightning protection bracket includes a non-crossing side lightning protection bracket inclined toward the non-crossing direction of the tower body and a crossing side lightning protection bracket inclined toward the crossing direction. Both the non-crossing side lightning protection bracket and the crossing side lightning protection bracket are configured as four-sided cones, and the cone apex is inclined toward its respective direction.

[0012] Furthermore, the cone apex height and cone inclination angle of the non-crossing side lightning protection bracket are set according to the lightning protection angle of the non-crossing side conductor; the cone apex height and cone inclination angle of the crossing side lightning protection bracket are set according to the lightning protection angle of the crossing side conductor.

[0013] Furthermore, the length of the conductor crossarm is set to meet the electrical distance between the cross-bracing communication ground wire and the conductor, and the electrical distance between the conductors.

[0014] The present invention also provides a single-circuit transmission crossing tower crossing system, including a single-circuit transmission crossing tower A and a single-circuit transmission crossing tower B as described in any of the above claims. The single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B are arranged facing each other on both sides of the line being crossed, and the crossing spans of the two crossing towers are arranged facing each other. The non-crossing span side of the single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B are both connected to conventional towers with single-circuit conductors.

[0015] Preferably, the distance between the single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B is not less than the distance between the conductors on both sides of the line being crossed, and is not greater than the maximum lightning protection radiation range between the ground wire of the line being crossed and the lightning protection bracket on the crossing side for the conductor of the crossing span.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the overall structure of a single-circuit transmission crossing tower according to the present invention;

[0019] Figure 2 This is a side view structural schematic diagram of a single-circuit transmission crossing tower according to the present invention;

[0020] Figure 3 This is a front view structural schematic diagram of a single-circuit transmission crossing tower according to the present invention;

[0021] Figure 4 This is a schematic diagram of the conductor connection for a single-circuit power transmission tower according to the present invention;

[0022] Figure 5 This is a schematic diagram of the overall structure of a single-circuit power transmission crossing tower system according to the present invention;

[0023] Figure 6 This is a schematic diagram of the conductor connection of a single-circuit power transmission crossing tower system according to the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Tower body; 21. Non-crossing side lightning protection bracket; 22. Crossing side lightning protection bracket; 31. Left conductor crossarm; 32. Right conductor crossarm; 41. Left conductor suspension point; 42. Middle conductor suspension point; 43. Right conductor suspension point; 51. Left ground wire suspension point; 52. Right ground wire suspension point; 53. Middle ground wire suspension point; 6. Communication ground wire lead-out; 7. Communication ground wire. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] This invention provides a single-circuit transmission crossing tower, as described below. Figures 1 to 4 To elaborate in detail.

[0028] A single-circuit transmission crossing tower includes a tower body 1. A conductor crossarm is provided in the middle of the tower body 1. One side of the tower body 1 perpendicular to the direction of the single-circuit conductor is a crossing span, and the other side is a non-crossing span. A ground wire suspension point is provided on the top of the tower body 1 facing the non-crossing span to connect the communication ground wire 7 to the non-crossing span. A middle ground wire suspension point 53 is provided on the conductor crossarm at a position corresponding to the middle of the tower body 1 and facing the crossing span to transfer the communication ground wire 7 to the crossing span side. The conductor crossarm is provided with multiple sets of conductor suspension points for connecting the conductor from the non-crossing span to the crossing span. A lightning protection bracket is provided on the top of the tower.

[0029] This invention places the ground wire suspension point at the same horizontal level as the conductor suspension point, significantly reducing the height of the ground wire within the crossing span compared to non-crossing spans. This makes the ground wire and conductor within the span approximately at the same horizontal plane. This configuration greatly compresses the vertical distance between the conductor and ground wire within the crossing span to a minimum, ensuring that the crossing line meets the safety distance requirements for both the line being crossed and the conductor of the crossing line to the ground, effectively improving the feasibility of transmission line crossings.

[0030] This tower type eliminates the ground wire support and connects the ground wire to the ground wire suspension point 1 on the tower body, reducing the impact of the ground wire load on the crossing tower. A lightning protection support is installed on the non-crossing span side, which provides lightning protection for the non-crossing span conductors, improving the economy and safety of the crossing tower.

[0031] In order to transfer the conductor from the non-crossing span to the crossing span, the conductor crossarm is located on both sides of the tower body 1 as a left crossarm and a right crossarm. The conductor suspension points include a left conductor suspension point 41 symmetrically arranged on the left crossarm on the crossing span side and the non-crossing span side, and a middle conductor suspension point 42 and a right conductor suspension point 43 symmetrically arranged on the right crossarm on both the crossing span and the non-crossing span side in a direction away from the tower body 1. Tension insulator strings are installed on the left conductor suspension point 41, the middle conductor suspension point 42 and the right conductor suspension point 43. The conductors are suspended at various suspension points via tension insulators. On the crossing tower, the left, middle, and right conductors are arranged horizontally. The conductors not crossing the span are led out from the left conductor suspension point 41 on the side of the crossing span to the left conductor suspension point 41 on the side of the paper crossing span. The conductors not crossing the span are led out from the middle conductor suspension point 42 on the side of the crossing span to the middle conductor suspension point 42 on the side of the paper crossing span. The conductors not crossing the span are led out from the right conductor suspension point 43 on the side of the crossing span to the right conductor suspension point 43 on the side of the paper crossing span. This ensures that the conductors of a single circuit do not cross when they are transferred in the crossarm. The left conductor suspension point 41, the middle conductor suspension point 42, and the right conductor suspension point 43 are on the same horizontal plane, and the distance between them meets the safety electrical distance requirements between the conductors.

[0032] At the top of tower body 1, the grounding points include a left grounding point 51 and a right grounding point 52. The left grounding point 51 and the right grounding point 52 are symmetrically arranged at both ends of the top of tower body 1. The left grounding point 51 and the right grounding point 52 are connected to the central grounding point 53 via a communication grounding wire 7 lead-out line 6. After the communication grounding wire 7 is connected to the left grounding point 51 and the right grounding point 52, it first runs from the top of tower body 1 towards the middle of the top of tower body 1, and then leads down from the middle of the top of tower body 1 directly above the central grounding point 53. The other end of the communication grounding wire 7 lead-out line 6 is connected to the central grounding point 53.

[0033] To ensure that the communication ground wire 7 of the crossing span is on the same plane as each conductor, the middle ground wire suspension point 53, the left conductor suspension point 41, the middle conductor suspension point 42, and the right conductor suspension point 43 are all set on the same horizontal plane. The communication ground wire 7 on one side of the crossing span is at the same horizontal position as the conductor loop on the same side of the crossing span. The distance between the middle ground wire suspension point 53 and the left conductor suspension point 41 and the right conductor suspension point 43 on the conductor crossarm crossing side meets the electrical distance requirements between the communication ground wire 7 and the conductor.

[0034] By using the communication ground wire 7 lead-out line 6, the non-crossing span ground wire is led to the ground wire hanging point 53 in the middle of the crossing span, so that the non-crossing span ground wire is connected to the crossing span ground wire. This ensures that the communication ground wire 7 is not disconnected when the transmission line crosses, and that the ground wire with communication function can still ensure smooth communication when crossing.

[0035] In order to ensure the connection between the crossing conductor and the communication ground wire 7, the length of the conductor crossarm needs to be set to meet the electrical distance between the crossing communication ground wire 7 and the conductor, as well as the electrical distance between the conductors. Furthermore, the height of the conductor crossarm from the ground should simultaneously ensure the electrical distance between the crossing conductor and the conductor being crossed, and the safe distance between the crossing conductor and the ground.

[0036] Furthermore, considering the lightning protection of the conductors crossing the span, the lightning protection bracket includes a non-crossing side lightning protection bracket 2221 inclined towards the tower body 1 in the direction of the non-crossing span and a crossing side lightning protection bracket 22 inclined towards the crossing span. Both the non-crossing side lightning protection bracket 2221 and the crossing side lightning protection bracket 22 are configured as four-sided cones, with the cone apex inclined towards their respective directions. The crossing side lightning protection bracket 22, facing the crossing span, together with the ground wire of the crossed line, provides lightning protection for the conductors crossing the span. The cone apex height and cone inclination angle of the non-crossing side lightning protection bracket 2221 are set according to the lightning protection angle of the conductors on the non-crossing span side; the cone apex height and cone inclination angle of the crossing side lightning protection bracket 22 are set according to the lightning protection angle of the conductors on the crossing span side. The cone height and cone inclination angle of the lightning protection bracket for the crossing span are determined based on the lightning protection angle requirements of the conductor crossing the span, combined with the ground wire height of the line being crossed (existing line) and the horizontal distance between the crossing tower and the line being crossed. The lightning protection scheme for the crossing span makes full use of the lightning protection capability of the line being crossed (existing line), which can reduce the height of the lightning protection bracket on the crossing span side and improve the feasibility, safety and economy of the crossing scheme.

[0037] This application also proposes a single-circuit transmission tower crossing system, referring to... Figures 1 to 6 To elaborate in detail.

[0038] A single-circuit transmission crossing tower crossing system includes a single-circuit transmission crossing tower A and a single-circuit transmission crossing tower B. The single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B are arranged facing each other on both sides of the line to be crossed, and the crossing spans of the two crossing towers are arranged facing each other. On the non-crossing span side of the single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B, a conventional tower is connected to a single-circuit conductor.

[0039] Within the crossing span, the communication ground wire 7 lead-out line 6, originating from the ground wire suspension point at the top of tower body 1 of single-circuit crossing tower A, descends through the ground wire suspension point 53 in the middle of tower body 1 of crossing tower A and connects to the ground wire suspension point 53 in the middle of tower body 1 of single-circuit crossing tower B. Then, the communication ground wire 7 lead-out line 6 ascends and connects to the ground wire suspension point at the top of tower body 1 of single-circuit crossing tower B, thus ensuring the unobstructed flow of the communication ground wire 7 within the crossing span. The ground wire suspension point and the conductor suspension point within this span are located at the same horizontal level. The lightning protection bracket 22 on the crossing side, together with the ground wire of the crossed line, provides lightning protection for the conductor in the crossing span.

[0040] The distance (span) between single-circuit crossing tower A and single-circuit crossing tower B varies depending on the height of the lightning arrester 22 on the crossing side and the ground wire of the crossed line. It should meet the following limitations: it should not be less than the distance between the conductors on the edge of the crossed span, and it should not be greater than the maximum lightning protection radiation range distance between the ground wire of the crossed line and the lightning arrester 22 on the crossing side for the conductors in the crossed span. For example, when the ground wire of the crossed line is higher, its lightning protection radiation range for the conductors in the crossed span is relatively larger. With the lightning arrester 22 on the crossing side unchanged, the distance between single-circuit crossing tower A and single-circuit crossing tower B can be increased accordingly; conversely, the distance between single-circuit crossing tower A and single-circuit crossing tower B should be decreased accordingly. When the height or tilt angle of the lightning arrester 22 on the crossing side is larger, its lightning protection radiation range for the conductors in the crossed span is relatively larger. With the ground wire height of the crossed line unchanged, the distance between single-circuit crossing tower A and single-circuit crossing tower B can be increased accordingly; conversely, the distance between single-circuit crossing tower A and single-circuit crossing tower B should be decreased accordingly.

[0041] This system comprehensively considers the interrelationship of three factors: the distance between crossing towers, the ground wire height of the crossed line, and the height of the lightning protection brackets on the crossing towers. This allows the lightning protection brackets on the crossing side and the crossed line to jointly provide lightning protection for the crossed line, making full use of the existing lightning protection function of the crossed line, reducing the height of the lightning protection brackets on the crossing side, and improving the reliability and economy of line crossing.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A single-circuit transmission crossing tower, characterized in that, The tower includes a tower body, a conductor crossarm in the middle of the tower body, two sides of the tower body perpendicular to the direction of the single-circuit conductor, one side of which is a crossing span and the other side is a non-crossing span, a ground wire suspension point is provided on the top of the tower body facing the non-crossing span to connect the communication ground wire to the non-crossing span, a central ground wire suspension point is provided on the conductor crossarm corresponding to the middle position of the tower body and facing the crossing span to transfer the communication ground wire to the crossing span side, multiple sets of conductor suspension points are provided on the conductor crossarm for connecting the conductor from the non-crossing span to the crossing span, and a lightning protection bracket is provided on the top of the tower. The conductor crossarm is located on both sides of the tower body and is divided into a left crossarm and a right crossarm. The conductor suspension points include a left conductor suspension point symmetrically arranged on the left crossarm on the side of the crossing span and the side of the non-crossing span. On the right crossarm, a middle conductor suspension point and a right conductor suspension point are symmetrically arranged in sequence along the direction away from the tower body on both the side of the crossing span and the side of the non-crossing span. Tension insulator strings are installed on the left conductor suspension point, the middle conductor suspension point and the right conductor suspension point. The central ground wire hanging point, the left conductor hanging point, the middle conductor hanging point, and the right conductor hanging point are all set on the same horizontal plane, and the communication ground wire on the crossing side is at the same horizontal position as the conductor loop on the crossing side. The lightning protection bracket includes a non-crossing side lightning protection bracket inclined toward the non-crossing direction of the tower body and a crossing side lightning protection bracket inclined toward the crossing direction. Both the non-crossing side lightning protection bracket and the crossing side lightning protection bracket are configured as four-sided pyramids, and the top of the pyramid is inclined toward their respective directions. The cone apex height and cone inclination angle of the non-crossing side lightning protection bracket are set according to the lightning protection angle of the non-crossing side conductor; the cone apex height and cone inclination angle of the crossing side lightning protection bracket are set according to the lightning protection angle of the crossing side conductor.

2. A single-circuit transmission crossing tower as described in claim 1, characterized in that, The left conductor hanging point, the middle conductor hanging point, and the right conductor hanging point are all on the same horizontal plane, and the distance between them meets the electrical distance requirements between conductors.

3. A single-circuit transmission crossing tower as described in claim 2, characterized in that, The grounding point includes a left grounding point and a right grounding point. The left grounding point and the right grounding point are symmetrically arranged at both ends of the top of the tower body. The left grounding point and the right grounding point are connected to the middle grounding point through a communication grounding lead-out line.

4. A single-circuit transmission crossing tower as described in claim 3, characterized in that, The spacing between the central ground wire suspension point and the left and right conductor suspension points on the side where the conductor crossarm crosses is located meets the electrical distance requirements between the communication ground wire and the conductor.

5. A single-circuit transmission crossing tower according to claim 1, characterized in that, The length of the conductor crossarm is set to meet the electrical distance between the communication ground wire and the conductor, and the electrical distance between the conductors.

6. A single-circuit transmission tower crossing system, characterized in that, Includes a single-circuit transmission crossing tower A and a single-circuit transmission crossing tower B as described in any one of claims 1-5 above. The single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B are arranged facing each other on both sides of the line being crossed, and the crossing spans of the two towers are arranged facing each other. The non-crossing span side of the single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B are both connected to conventional towers with single-circuit conductors. The conductors and communication ground wires within the crossing spans pass through the same horizontal plane below the line being crossed.

7. A single-circuit transmission tower crossing system as described in claim 6, characterized in that, The distance between the single-circuit transmission crossing tower A and the single-circuit transmission crossing tower B shall not be less than the distance between the conductors on both sides of the line being crossed, and shall not be greater than the maximum lightning protection radiation range between the ground wire of the line being crossed and the lightning protection bracket on the crossing side for the conductor of the crossing span.

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