Overhead line and supporting type flexible conductor mixed line

Abstract

The utility model relates to the technical field of electric power engineering, provides a line crossing mode which is convenient to construct and more economical, and provides an overhead line and supporting type flexible wire mixed line which comprises a first pole tower, a second pole tower, an existing line, a flexible wire, a door-shaped framework and a plurality of supporting columns arranged between the first pole tower and the second pole tower. The supporting column comprises a supporting column insulator support playing a supporting role and a supporting column insulator arranged at the top end of the supporting column insulator support, before the flexible conductor needs to pass through an existing line, the line is guided and led down from a first pole tower by adopting the door-shaped framework, the flexible conductor is supported by adopting the supporting column at a passing section, and after the flexible conductor passes through the existing line, the supporting column insulator is arranged at the top end of the supporting column insulator support. And a door-shaped framework is adopted to lead the line to a second pole tower from the supporting columns. The flexible lead penetrates downwards and the support columns are used for supporting, so that the construction is convenient, the manufacturing cost is low, the adaptability is high, and the operation and maintenance workload is small.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power engineering, in particular to a hybrid line of overhead lines and supported flexible conductors. Background Art

[0002] The proportion of electric power in energy is getting higher and higher, which brings about a more complex power grid and more line crossings. Traditional line crossings generally adopt high crossings or underpasses of overhead transmission lines. To find a suitable crossing location, the line length generally needs to be increased, and this method is only applicable to crossing 1 line. It is generally not feasible to continuously cross two or more lines. When it is not feasible to cross an overhead line, cables are also often used for crossing, but using cables will bring problems such as tower modification, annual routine tests, increased capacitive current, and overvoltage. Content of the Utility Model

[0003] In order to provide a more convenient and economical line crossing method, the present application provides a hybrid line of overhead lines and supported flexible conductors.

[0004] The technical solution adopted by the utility model to solve the above problems is as follows:

[0005] The hybrid line of overhead lines and supported flexible conductors includes: a first tower, a second tower, an existing line and a flexible conductor, and also includes a gantry frame and several struts arranged between the first tower and the second tower. The struts include strut insulator brackets for support, and strut insulators arranged at the top of the strut insulator brackets. Before the flexible conductor needs to cross the existing line, the line is guided down from the first tower by using the gantry frame, and supported by struts in the crossing section. After crossing the existing line, the line is led up from the struts to the second tower by using the gantry frame.

[0006] Further, the strut also includes a diagonal brace for supporting the strut insulator bracket.

[0007] Further, among all the struts, diagonal braces are arranged at intervals of N struts.

[0008] Further, the struts are evenly distributed at an interval of 10 m.

[0009] Further, diagonal braces are added to the struts every 80 m.

[0010] Further, a conversion flange is arranged at the bottom of the strut insulator bracket.

[0011] The beneficial effects of the utility model compared with the prior art are as follows: By using a flexible conductor to pass under and supporting it with struts, it has the advantages of convenient construction, low cost, strong adaptability and less maintenance workload. Description of the Drawings

[0012] Figure 1 It is a structural diagram of a hybrid line of overhead lines and supported flexible conductors;

[0013] Description of the drawings: 1 is the existing line; 2 is the flexible conductor; 3 is the post insulator; 4 is the post insulator support. Specific embodiments

[0014] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0015] The overall height of the overhead transmission line is controlled by the lowest point of the conductor. The basic idea of this application is to change the shape of the overhead line from a large arc to several small arcs, thereby reducing the average height of the conductor and making the line crossing scheme feasible and basically not limited by the height of the original line.

[0016] As Figure 1 shown, the hybrid line of overhead lines and supported flexible conductors includes: the first tower, the second tower, the existing line 1 and the flexible conductor 2, and also includes a gantry frame and several posts arranged between the first tower and the second tower. The posts include a post insulator support 4 for support, and a post insulator 3 arranged at the top of the post insulator support 4. Before the flexible conductor 2 needs to cross the existing line, the line is guided down from the first tower by a gantry frame, supported by posts in the crossing section, and after crossing the existing line, the line is led up from the posts to the second tower by a gantry frame.

[0017] After analyzing the sag and tension of the conductor, the post insulators in this application are evenly distributed at a spacing of 10 m; for some terrains with large height differences or other special situations, the layout spacing of the post insulators can be appropriately reduced.

[0018] Considering that the continuous long-distance post insulators and the line may be subjected to wind pressure in the same direction, calculated according to the maximum wind speed V = 27 m / s, it is recommended to add diagonal braces to the post insulator supports every about 80 m. In actual use, the force calculation can be carried out according to the wind speed to determine the setting position of the diagonal braces. Diagonal braces can also be considered for some posts arranged on terrains such as slopes.

[0019] Considering enhancing the applicability of the scheme and the maintenance requirements of some underground facilities in the areas where the line passes, a conversion flange can be added at the bottom of the post insulator support if necessary.

[0020] The type selection of the post insulator can be obtained through force calculation according to the short-circuit current, environmental conditions, etc. For example, the force calculation is carried out as follows according to a short-circuit current of 50 kA:

[0021] 1. The horizontal load generated on the wire during phase-to-phase short circuit

[0022]

[0023] Among them, the vibration coefficient u is taken as 0.58.

[0024] 2. The wind load on the wire

[0025]

[0026] Among them, the wind shape coefficient k 1 is taken as 1.2, the wind pressure height change coefficient k 2 is taken as 1, and the maximum wind speed V = 27 m / s.

[0027] 3. The horizontal tension at the top of the post insulator after converting the wind pressure borne by the post insulator itself

[0028]

[0029] Among them, the wind speed non-uniformity coefficient a is taken as 1, the aerodynamic coefficient k is taken as 1.2, the average outer diameter D1 of the post insulator is taken as 0.364 m, and the height H of the post insulator is taken as 4.5 m.

[0030] 4. The horizontal force at the top of the post insulator during short circuit

[0031] P = P k + P N + P Z = 333.46 + 803.72 + 438.83 = 1576.01 N

[0032] The destructive force F = P / 0.6 = 1576.01 / 0.6 = 2626.68 N = 2.63 kN

[0033] Selected according to a safety factor of 2.5: P = 1576.01 × 2.5 = 3.94 kN

[0034] After the above calculations, the post insulator is selected to be not less than 4 kN. Considering a certain margin, the commonly used 8 kN product can meet the requirements when selecting the post insulator.

Claims

1. Overhead line and supporting flexible conductor mixed line, including: The first pole tower, the second pole tower, the existing line and the soft conductor are characterized in that they also include a portal frame and a plurality of pillars arranged between the first pole tower and the second pole tower, the pillars include a pillar insulator bracket for supporting, and a pillar insulator arranged at the top of the pillar insulator bracket. Before the soft conductor needs to cross the existing line, the portal frame is used to guide the line down from the first pole tower, the pillars are used to support it in the crossing section, and after crossing the existing line, the portal frame is used to guide the line from the pillars to the second pole tower.

2. The overhead line and supporting soft conductor hybrid line according to claim 1 is characterized in that: The post also includes an oblique support for supporting a post insulator bracket.

3. The overhead line and supporting soft conductor hybrid line according to claim 2 is characterized in that: Among all the pillars, diagonal supports are provided at intervals of N pillars.

4. The overhead line and supporting soft conductor hybrid line according to claim 3 is characterized in that: The pillars are evenly distributed at intervals of 10m.

5. The overhead line and supporting soft conductor hybrid line according to claim 4, characterized in that: Additional inclined supports are provided on the pillars every 80m.

6. The overhead line and supporting flexible conductor hybrid line according to any one of claims 1 to 5, characterized in that: A conversion flange is arranged at the bottom of the support insulator bracket.

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