Configuration method for same-side incoming and outgoing of ground wires of power transmission tower in limited area

Abstract

The invention discloses a same-side in-out configuration method for transmission tower ground wires in a limited area, and relates to the technical field of transmission lines. In the current low-voltage level overhead line project, particularly in a complex and limited environment, such as narrow and small spaces in a hydropower station, overhead line design faces many challenges. The method comprises the following steps: firstly, selecting or designing an iron tower model meeting the foundation full root distance limitation, then carrying out solid modeling, analyzing intersections between wires and the electrical safety distance of the intersections, optimizing and adjusting the intersections which do not meet the electrical safety distance requirement, and finally designing and processing a hanging plate structure meeting the same-side in-out requirement of the wires. According to the invention, a comprehensive grounding wire same-side in-out configuration design scheme is provided for an overhead line project in a complex and limited environment, safe and stable operation of a power transmission line is ensured, and the problem of same-side in-out of the overhead line in a complex and limited area is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission lines, and in particular to a method for configuring same-side entry and exit of ground wires of a power transmission tower under a restricted area. Background Art

[0002] In current low-voltage overhead line projects, especially in complex and restricted environments, such as narrow spaces inside hydropower stations, there are many challenges in designing overhead lines. For example, the dense crossing objects, limited floor space, and fixed path channels make it difficult for traditional designs to meet the requirements. Especially in specific scenarios, such as the design of the terminal tower of a 35kV single-circuit overhead line project, it is necessary to meet the special requirements of the conductors entering and exiting on the same side, and the full root opening of the foundation is strictly limited (no more than 5m), while keeping the original tower position, foundation root opening, cross arm direction and gantry layout unchanged. In this case, the traditional tower design cannot meet the conductor crossing problem caused by the same-direction entry and exit of the line, and the requirements for ensuring electrical safety distance. Therefore, there is an urgent need for an innovative design method for the same-side entry and exit configuration of the ground wire of the transmission tower to solve the above technical problems. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions, and provide a method for configuring the ground wire of a transmission tower on the same side in a restricted area, so as to solve the design problem of the ground wire of a transmission tower in a complex restricted area and improve the safety of the project. To this end, the present invention adopts the following technical solutions.

[0004] A method for configuring the same-side entry and exit of ground wires of a power transmission tower under a restricted area comprises the following steps: 1) Conduct on-site surveys and obtain relevant terrain data information. According to the on-site survey results and terrain-related data information, determine the full-root opening limit of the tower foundation and the requirements for the same-side entry and exit of the conductors, determine the tower plan, and select or design a tower model that meets the full-root opening limit of the foundation; 2) Use 3D design software to conduct entity modeling of the tower and its conductors, and analyze the intersection points between conductors and their electrical safety distances based on on-site measurement results; 3) Optimize and adjust the intersections that do not meet the electrical safety distance requirements; 4) According to the hanging plate angle value provided by the electrical plan view, design and process the hanging plate structure that meets the requirements of the wires entering and exiting on the same side; 5) Carry out corresponding processing, manufacturing and on-site construction according to the design results. It provides a comprehensive design scheme for the same-side entry and exit configuration of ground wires for overhead line projects in complex and restricted environments, ensuring the safe and stable operation of transmission lines and effectively solving the problem of same-side entry and exit of overhead lines in complex and restricted areas.

[0005] As a preferred technical means: In step 1), select or design a tower solution to meet the requirement that the full root opening of the foundation is no more than 5 meters. In a restricted environment such as a small footprint, meeting the requirement that the full root opening of the foundation is no more than 5 meters can adapt to more complex site conditions, improve the feasibility of the design solution in a restricted area, and reduce the occupation of land resources.

[0006] As a preferred technical means: In step 3), the cross point is optimized by widening the cross arm or adjusting the arrangement of the conductors. Widening the cross arm or adjusting the arrangement of the conductors can effectively increase the distance between the conductors, ensure electrical safety, and improve the reliability and stability of the transmission line.

[0007] As a preferred technical means: measure and evaluate the minimum distance between conductors at intersections to ensure that the specified electrical safety distance requirements are met. By measuring and evaluating the minimum distance between conductors at intersections, potential safety hazards can be discovered in a timely manner, ensuring that the electrical safety distance requirements are met, reducing the risk of short circuits, discharges and other faults in the line, and ensuring the safety of personnel and equipment.

[0008] As an optimal technical means: ensure that the minimum distance between the middle phase and the side phase and the minimum distance between the tower and the conductor are greater than the set value, and the set value meets the design specification requirements of 66kV and below overhead power lines. Strictly following the design specification requirements ensures the design quality and safety of the transmission line, can effectively prevent the occurrence of electrical accidents, and improve the operational reliability of the line.

[0009] As a preferred technical means: Use electrical safety analysis software to verify and optimize electrical safety distances. With the help of electrical safety analysis software, electrical safety distances can be verified and optimized more accurately, improving the accuracy and reliability of the design, reducing human errors, and providing strong technical support for the safe operation of transmission lines.

[0010] As a preferred technical means: the hanging plate structure includes a method of stacking two hanging plates, an upper hanging plate and a lower hanging plate, to meet the special needs of the ground wire entering and exiting on the same side. In view of the special situation that the ground wire enters and exits on the same side, the hanging plate structure is designed by stacking two hanging plates, which can ensure the correct mounting and stable connection of the wires and ground wires entering and exiting on the same side, meeting the special needs in complex and restricted environments.

[0011] As a preferred technical means: the hanging board stacking method should include the fire bending angle of the hanging board, and the fire bending angle of the upper hanging board and the lower hanging board should be adjusted according to the values ​​provided by the electrical plane section diagram to ensure that the wire can be correctly mounted and maintain a stable electrical connection. The transmission efficiency and reliability of the line are improved, and the risk of line failure caused by inappropriate hanging board angles is reduced.

[0012] Beneficial effects: It provides a comprehensive design scheme for the same-side entry and exit configuration of ground wires for overhead line projects in complex and restricted environments, which can ensure electrical safety, improve the reliability and stability of transmission lines, ensure the safe and stable operation of transmission lines, and effectively solve the problem of same-side entry and exit of overhead lines in complex and restricted areas. It can adapt to complex site conditions, improve the feasibility of the design scheme in restricted areas, and reduce the occupation of land resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the process of the present invention.

[0014] Figure 2 It is a path diagram in an example of the present invention.

[0015] Figure 3 It is a schematic diagram of the arrangement of iron towers in an example of the present invention.

[0016] Figure 4 It is a comprehensive modeling diagram of the China Tower in the example of the present invention.

[0017] Figure 5 It is a modeling diagram of the closest distance between the phase and the edge phase in the example of the present invention.

[0018] Figure 6 It is a modeling diagram of the closest distance between the phase and the tower body in the frame file in the example of the present invention.

[0019] Figure 7 This is the modeling diagram of the closest distance between the edge phase and the tower body in the present invention.

[0020] Figure 8 It is a partial schematic diagram of the iron tower in the present invention.

[0021] Fig. 9 The present invention Figure 8 Schematic diagram of the AA position.

[0022] Fig.10 The present invention Figure 8 Schematic diagram of the BB position.

[0023] Fig.11 It is a schematic diagram of the fire bending angle of the hanging board in the present invention.

[0024] In the figure: 1. tower body; 2. right cross arm; 3. hanging plate; 301. upper hanging plate; 302. lower hanging plate. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, a method for configuring the same-side entry and exit of the ground wire of a transmission tower under a restricted area includes the following steps: S1: Conduct on-site survey and obtain relevant terrain data information, determine the full-root opening limit of the tower foundation and the requirements for the same-side entry and exit of the conductors based on the on-site survey results and terrain-related data information, determine the tower plan, and select or design a tower model that meets the full-root opening limit of the foundation; S2: Use 3D design software to conduct entity modeling of the tower and its conductors, and analyze the intersections between conductors and their electrical safety distances based on on-site measurement results; S3: Optimize and adjust the intersections that do not meet the electrical safety distance requirements; S4: Based on the hanging plate angle value provided by the electrical plan view, design and process the hanging plate structure that meets the requirements of wire entry and exit on the same side.

[0027] S5: Carry out corresponding product processing, manufacturing and on-site construction according to the design results.

[0028] In order to improve the feasibility of the design scheme in the restricted area, in step S1, the iron tower scheme is selected or designed to meet the requirement that the full root opening of the foundation is not more than 5 meters. In a restricted environment such as a small area, meeting the requirement that the full root opening of the foundation is not more than 5 meters can adapt to more complex site conditions, improve the feasibility of the design scheme in the restricted area, and reduce the occupation of land resources.

[0029] In order to improve the reliability and stability of the transmission line, in step S3, the cross point is optimized and adjusted by widening the cross arm or adjusting the arrangement of the conductors. Widening the cross arm or adjusting the arrangement of the conductors can effectively increase the distance between the conductors, ensure electrical safety, and improve the reliability and stability of the transmission line.

[0030] In order to reduce the risk of short circuit, discharge and other faults in the line, measure and evaluate the minimum distance between the conductors at the intersection to ensure that the specified electrical safety distance requirements are met. By measuring and evaluating the minimum distance between the conductors at the intersection, potential safety hazards can be discovered in a timely manner, ensuring that the electrical safety distance requirements are met, reducing the risk of short circuit, discharge and other faults in the line, and ensuring the safety of personnel and equipment.

[0031] In order to ensure the design quality and safety of the transmission line, the minimum distance between the middle phase and the side phase and the minimum distance between the tower 1 and the conductor meet the design specifications of 66kV and below overhead power lines. Strictly following the design specifications ensures the design quality and safety of the transmission line, effectively prevents electrical accidents, and improves the operational reliability of the line.

[0032] In order to verify and optimize the electrical safety distance more accurately, the electrical safety analysis software is used to verify and optimize the electrical safety distance. With the help of electrical safety analysis software, the electrical safety distance can be verified and optimized more accurately, the accuracy and reliability of the design can be improved, human errors can be reduced, and strong technical support can be provided for the safe operation of the transmission line.

[0033] In order to meet the special requirements of ground wire entering and exiting on the same side in complex and restricted environments, such as Figure 9-11 As shown, the hanging plate 3 structure of the cross arm and the tower body 1 includes a method of stacking two hanging plates 3, an upper hanging plate 301 and a lower hanging plate 302, to meet the special needs of the ground wire entering and exiting on the same side. In view of the special situation that the ground wire enters and exits on the same side, the hanging plate 3 structure is designed by stacking two hanging plates 3, which can ensure the correct mounting and stable connection of the conductor and ground wire entering and exiting on the same side, meeting the special needs in a complex and restricted environment.

[0034] In order to reduce the risk of line failure due to inappropriate angle of the hanging plate 3, the hanging plate 3 stacking method should include the fire bending angle of the hanging plate 3, and the fire bending angles of the upper hanging plate 301 and the lower hanging plate 302 are adjusted according to the values ​​provided by the electrical plane section diagram to ensure that the wire can be correctly mounted and maintain a stable electrical connection. The transmission efficiency and reliability of the line are improved, and the risk of line failure due to inappropriate angle of the hanging plate 3 is reduced.

[0035] The following takes a 35kV single-circuit overhead line project as an example. The last iron tower of the 35kV single-circuit overhead line project is located in the hydropower station, and the line is in an overhead line mode. The project requires that the location of the new iron tower is the location of the iron tower in the original hydropower station, and the full root of the foundation is required to be no more than 5m. The cross arm direction, gantry, etc. are arranged according to the previous period and cannot be changed. Since the line path is fixed, the path pile number is J1-J2-J3-J4, of which J1-J2-J3 is the line side tension section, and J3-J4 is the entry frame tension section. The J3 pile number is the tension terminal iron tower configured for the same side of the conductor in and out of this design scheme, and the pile on the J4 pile number is the gantry. Figure 2 shown.

[0036] The incoming and outgoing lines of the terminal tower are located on the same side, such as Figure 3 As shown in the figure, the gantry side and the large side of the line are both located on the small side of the tower. Figure 3 It can be seen that there are actually three intersection points, namely Figure 3 The first, second and third intersections in the design. This design solution needs to solve the problem of line crossing and tower design optimization.

[0037] Considering that the full root opening of the foundation is not more than 5m, the tower with a root opening of 4.926m was selected. The tower foundation was solid modeled for the line using 3D design software. Figure 3 , Figure 4As can be seen in the figure, there are three plane intersections in and out of the tower on the same side, namely the first intersection, the second intersection, and the third intersection. At the first intersection, due to the height factor between floors, the two conductors are not on the same crossarm plane, which meets the electrical safety distance. There are two intersections that really meet the control conditions, namely the second intersection and the third intersection. Through the distance measurement function between conductors in the three-dimensional model, the closest distance between the middle phase and the side phase at the second intersection is measured to be 0.37 meters. Figure 5 As shown in the figure, the shortest distance between the phase conductor in the frame and the tower body 1 is 0.75 meters. Figure 6 As shown, the distance between the third intersection point and the tower body 1 is 0.61 meters. Figure 7 shown.

[0038] The closest distance between the middle phase and the side phase at the second intersection is 0.37 meters, and the distance between the third intersection and the tower body 1 is 0.61 meters, which has basically reached the lower limit of the minimum clearance of 0.6m between the live part and the grounded part of the live working tower in the 66kV and below overhead power line design specification GB50061. After considering the construction error in the later stage, it will not meet the requirements and needs to be optimized and adjusted. The right cross arm 2 is widened and the redesign method is adopted to solve it. Figure 8 , 9 shown.

[0039] like Figure 9-11 As shown, according to the angle values ​​of the hanging plates 3 provided by the electrical plan view, the upper hanging plate 301 has a bending angle b of -25 degrees, and the lower hanging plate 302 has a bending angle a of 50 degrees, so as to establish a physical hanging plate. Since the ground wires enter and exit on the same side, two hanging plates 3 must be stacked on one side to make and process.

[0040] The present invention provides a comprehensive same-side entry and exit configuration design scheme for overhead line projects in complex restricted environments, ensuring the safe and stable operation of transmission lines and effectively solving the same-side entry and exit problem of overhead lines in complex restricted areas.

[0041] The above-mentioned method for configuring the same-side entry and exit of the ground wire of the transmission tower in a restricted area is a specific embodiment of the present invention, which has embodied the outstanding substantial features and significant progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the protection scope of this scheme.

Claims

1. A method for configuring the same-side entry and exit of the ground wire of a power transmission tower under a restricted area, characterized in that The following steps are involved: 1) Conduct on-site surveys and obtain relevant terrain data information. According to the on-site survey results and terrain-related data information, determine the full-root opening limit of the tower foundation and the requirements for the same-side entry and exit of the conductors, determine the tower plan, and select or design a tower model that meets the full-root opening limit of the foundation; 2) Use 3D design software to conduct entity modeling of the tower and its conductors, and analyze the intersection points between conductors and their electrical safety distances based on on-site measurement results; 3) Optimize and adjust the intersections that do not meet the electrical safety distance requirements; 4) According to the hanging plate angle value provided by the electrical plan view, design and process the hanging plate structure that meets the requirements of the wires entering and exiting on the same side; 5) Carry out corresponding processing, manufacturing and on-site construction according to the design results.

2. The method for configuring the same-side entry and exit of the ground wire of a power transmission tower under a restricted area according to claim 1, characterized in that: In step 1), select or design a tower solution to ensure that the full root opening of the foundation is no greater than 5 meters.

3. The method for configuring the ground wires of a power transmission tower on the same side for entering and exiting the tower in a restricted area according to claim 1, characterized in that: In step 3), the intersection is optimized by widening the crossarm or adjusting the conductor arrangement.

4. The method for configuring the ground wires of a power transmission tower on the same side for entry and exit in a restricted area according to claim 3, characterized in that: Measure and evaluate the minimum distance between conductors at intersections to ensure that the specified electrical safety distance requirements are met.

5. The method for configuring the same-side entry and exit of the ground wire of a power transmission tower under a restricted area according to claim 4, characterized in that: Ensure that the minimum distance between the middle phase and the side phase and the minimum distance between the tower and the conductor are greater than the set value.

6. The method for configuring the same-side entry and exit of the ground wires of a power transmission tower under a restricted area according to claim 5, characterized in that: Use electrical safety analysis software to verify and optimize electrical safety distances.

7. The method for configuring the same-side entry and exit of the ground wires of a power transmission tower under a restricted area according to claim 6, characterized in that: The hanging plate structure includes a method of stacking two hanging plates, an upper hanging plate and a lower hanging plate, to meet the special requirement of the ground wire entering and exiting on the same side.

8. The method for configuring the same-side entry and exit of the ground wires of a power transmission tower under a restricted area according to claim 7, characterized in that: The hanging board stacking method described above should include the fire bending angle of the hanging board. The fire bending angles of the upper hanging board and the lower hanging board are adjusted according to the values ​​provided by the electrical plan view to ensure that the wires can be correctly mounted and maintain a stable electrical connection.

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