V-shaped hard jumper string horizontal drilling tower suitable for 750kV line

Abstract

The invention discloses a V-shaped hard jumper wire string horizontal drilling tower suitable for a 750kV line, which comprises an iron tower body, the iron tower body is provided with a lead and a jumper wire which are horizontally arranged, the jumper wire is connected to an iron tower cross arm on the iron tower body through a V-shaped hard jumper wire string, the top of the iron tower body is provided with a ground wire bracket, and the ground wire bracket is provided with a ground wire. The three ground wires on the top of the iron tower body are fixed through the ground wire support, the situation that when the safe distance for drilling an existing power line is insufficient, transformation of the existing line above is achieved can be avoided, the operation stability of a power grid is improved, and the transformation cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission line design, and in particular to a V-shaped hard jumper string horizontal drilling tower applicable to 750kV lines. BACKGROUND

[0002] With the increase of the construction density of the extra-high voltage power grid, the demand for the 750kV newly-built lines to drill (i.e., to pass through from below) the existing extra-high voltage and ultra-high voltage power lines is increasing. The existing technology proposes a variety of solutions to solve the problem of insufficient safety distance of the conductor (or jumper) to the ground and the limited drilling vertical clearance, but all of them have certain technical defects.

[0003] In the related art, the jumper upper winding type composite cross arm scheme can meet the safety distance of the jumper to the ground, but has the defects of obvious increase of the tower head height, less operation experience of the composite cross arm and high failure probability, high cost and high operation and maintenance requirement. The split sub-tower scheme can increase the drilling clearance by the horizontal distribution of the three-phase jumpers, but has the problems of high cost due to the large total weight, large land acquisition range and difficult procedures, and difficult operation and maintenance.

[0004] Therefore, how to improve the operation stability of the power grid and save the cost is an urgent problem to be solved. SUMMARY

[0005] In view of the above problems, the present application provides a V-shaped hard jumper string horizontal drilling tower applicable to 750kV lines, which can avoid the modification of the existing power lines above when the safety distance of the drilling is insufficient, improve the operation stability of the power grid, and save the modification cost.

[0006] In a first aspect, the embodiments of the present application provide a V-shaped hard jumper string horizontal drilling tower applicable to 750kV lines, which comprises: A tower body, the tower body is provided with conductors and jumpers arranged horizontally, the jumpers are connected to the tower cross arm of the tower body in the form of V-shaped hard jumper strings, the tower body is provided with a ground wire support at the top, and the ground wire support fixes the three ground wires at the top of the tower body.

[0007] In some embodiments, the number of V-shaped hard jumper strings is three, corresponding to the jumpers of three-phase lines.

[0008] In some embodiments, the arrangement of the three ground wires satisfies the height reduction of the ground wire support (2) corresponding to the three ground wires, and the reduction amplitude is 2 meters.

[0009] In some embodiments, the two ends of the V-shaped hard jumper string are connected with the conductors and the tower cross arm, respectively.

[0010] In some embodiments, the horizontally arranged conductors and jumpers are in the same horizontal plane.

[0011] In some embodiments, the number of ground wire supports is three, and each ground wire support corresponds to a fixed ground wire.

[0012] In some embodiments, the tower body is a H-shaped structure made of steel.

[0013] In some embodiments, the V-shaped hard jumper string arrangement reduces the sag distance of the jumper.

[0014] In some embodiments, the tower body is made of steel.

[0015] In some embodiments, the tower body is a single tower structure.

[0016] The V-shaped hard jumper string horizontal tower drilling of the present application is suitable for 750kV lines, which comprises a tower body, horizontally arranged conductors and jumpers on the tower body, a V-shaped hard jumper string connected to the tower cross arm on the tower body, and a ground wire support on the top of the tower body. The ground wire support fixes three ground wires on the top of the tower body, which can avoid insufficient safety distance when drilling through existing power lines, realize the modification of the existing lines above, and improve the stability of the power grid and save modification costs.

[0017] At least the following advantages are also provided: 1. The horizontal arrangement of the jumper string on the tower body reduces the tower head height and increases the vertical clearance of the existing lines; 2. The V-shaped hard jumper string used in the tower body reduces the sag height of the jumper and compresses the safety distance of the jumper to the ground; 3. The tower body uses composite cross arms made of steel as construction materials, which ensures the stability of the tower in the later stage of operation; 4. Compared with the traditional split sub-tower, the tower body uses a single tower to drill, which reduces the land acquisition range and improves the operation convenience; 5. The tower body innovatively uses three ground wires, which solves the problem of compressing the ground wire support height and increasing the vertical clearance of the existing lines without changing the ground wire protection capacity.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be described in more detail below based on the embodiments and with reference to the accompanying drawings.

[0020] Figure 1 An exemplary V-type hard jumper string horizontal drilling tower structure suitable for 750kV lines is shown in the embodiment of the present application.

[0021] Reference signs: 1, tower body; 2, ground wire support; 3, V-type hard jumper string; 4, tower cross arm. DETAILED DESCRIPTION

[0022] In order to make the object, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with embodiments and drawings. The exemplary embodiments of the present application and their descriptions are only used to explain the present application and do not limit the present application.

[0023] The applicant found through research that in the prior art, the existing jumper string winding type composite cross arm design scheme has three technical defects: 1. The jumper string winding structure in the scheme needs to occupy additional vertical space, which increases the height above the tower head, although it compresses the safety distance of the jumper string to the ground, it also increases the vertical clearance distance of the drilling to the existing line, and the optimization of the overall height of the tower is not obvious; 2. The composite cross arm is used in the scheme, which has less experience in 750kV line operation, and the probability of failure in later operation is higher; 3. The composite cross arm is a new material, which has higher cost and higher technical requirements for operation and maintenance personnel.

[0024] In addition, the design scheme of the split sub-tower drilling has three technical defects: 1. The split sub-tower separates one tower into three towers, although the weight of a single tower is reduced, the total weight is still heavier than a single tower, and the cost is higher; 2. The split sub-tower has a larger land acquisition range, and it is more difficult to handle the land pre-examination procedures; 3. The operation and maintenance of the split sub-tower are more difficult.

[0025] In view of the above problems, the applicant proposes a V-type hard jumper string horizontal drilling tower suitable for 750kV lines, which can achieve the following beneficial effects: In the present application, the jumper string is arranged horizontally, which reduces the tower head height and increases the drilling vertical clearance distance to the existing line.

[0026] In the present application, the V-type hard jumper string is used, which reduces the jumper sag height and compresses the safety distance of the jumper string to the ground.

[0027] The composite cross arm is not used in the application, and steel material consistent with the conventional iron tower is used as the construction material, so that the stability of the iron tower in the later stage is ensured.

[0028] Compared with the split sub-tower, the single iron tower is used in the application to cross, so that the land acquisition range is reduced and the operation and maintenance convenience is improved.

[0029] The type of three ground wires is innovatively used in the application, the ground wire support height is compressed, and the crossing vertical clearance of the existing line is increased under the condition that the ground wire protection capability is unchanged.

[0030] The V-shaped hard jumper string horizontal crossing tower suitable for 750kV lines is described in detail in the subsequent embodiments.

[0031] The application scene of the V-shaped hard jumper string horizontal crossing tower suitable for 750kV lines provided in the embodiments of the application is introduced as follows: Please refer to Figure 1 , Figure 1 The V-shaped hard jumper string horizontal crossing tower structure diagram suitable for 750kV lines provided in the embodiments of the application is shown.

[0032] Figure 1 The V-shaped hard jumper string horizontal crossing tower suitable for 750kV lines includes: The iron tower body 1 is provided with horizontally arranged conductors and jumpers, the jumpers are connected to the iron tower cross arm 4 on the iron tower body 1 in the form of a V-shaped hard jumper string 3, and the iron tower body 1 is provided with a ground wire support 2 at the top, which fixes the three ground wires at the top of the iron tower body 1.

[0033] The number of V-shaped hard jumper strings 3 is three, corresponding to the jumpers of three-phase lines.

[0034] The arrangement of the three ground wires satisfies the reduction of the ground wire support height corresponding to the three ground wires, and the reduction amplitude is 2 meters.

[0035] The two ends of the V-shaped hard jumper string 3 are connected with the conductors and the iron tower cross arm 4 respectively.

[0036] The horizontally arranged conductors and jumpers are in the same horizontal plane.

[0037] The number of ground wire supports 2 is three, and each ground wire support 2 corresponds to a fixed ground wire.

[0038] The iron tower body 1 is a dry type structure constructed of steel material.

[0039] The setting of the V-shaped hard jumper string 3 reduces the jumper sag distance.

[0040] The iron tower body 1 is constructed of steel material.

[0041] The iron tower body 1 is a single iron tower structure.

[0042] Specifically, in the present application, the structure of the traditional strain tower "dry" character is modified, the conductor and the jumper are arranged horizontally, and the tower head height is compressed by about 17 meters.

[0043] By modifying the traditional soft jumper type to a V-shaped hard jumper, the jumper sag distance is reduced by about 2 meters.

[0044] In order to further compress the tower head height, without increasing the height of the ground wire support 2, considering that if two ground wire supports 2 are used, it cannot meet the requirement in f that "the distance between two ground wires on the tower of 750kV and below AC line shall not exceed 5 times the vertical distance between the ground wire and the conductor." Therefore, three ground wire supports 2 are innovatively used, which meets the requirements of the line standard and reduces the height of the ground wire support 2 by about 2 meters.

[0045] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A V-shaped rigid jumper string for horizontal drilling over a 750kV line, characterized in that, include: The tower body (1) is provided with horizontally arranged conductors and jumpers. The jumpers are connected to the tower crossarm (4) on the tower body (1) by V-shaped hard jumper string (3). The top of the tower body (1) is provided with a ground wire bracket (2). The ground wire bracket (2) fixes the three ground wires at the top of the tower body (1).

2. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The number of the V-shaped hard jumper string (3) is three, each corresponding to a jumper in a three-phase line.

3. The V-shaped hard jumper string horizontal drilling tower applicable to 750kV lines according to claim 1, characterized in that the arrangement of the three ground wires satisfies the requirement that the height of the ground wire support (2) corresponding to the three ground wires is reduced by 2 meters.

4. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The two ends of the V-shaped hard jumper string (3) are connected to the conductor and the crossarm of the tower (4), respectively.

5. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The horizontally arranged conductors and jumpers are on the same horizontal plane.

6. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The number of ground wire brackets (2) is three, and each ground wire bracket (2) corresponds to a fixed ground wire.

7. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The main body of the iron tower (1) is a steel-constructed T-shaped structure.

8. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The V-shaped hard jumper string (3) reduces the jumper sag distance.

9. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The tower body (1) is constructed of steel.

10. A V-shaped hard jumper string horizontal drilling tower suitable for 750kV lines according to claim 1, characterized in that, The tower body (1) is a single tower structure.

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