CN203367935U - Phase distance optimization structure for strain tower of compact transmission line - Google Patents

Abstract

The utility model discloses an optimized structure for interphase distance of a tension tower of a compact transmission line. The tension tower includes a tower foot, a tower body, a tower head, a jumper insulator string, a tension string and a jumper; the tower head includes The upper cross arm, the middle cross arm and the lower cross arm are arranged in sequence from top to bottom; the jumper insulator string includes the inner corner phase jumper insulator string, the outer corner phase jumper insulator string, and the lower phase jumper insulator string; the tension string includes the outer corner Phase tension strings, inner angle phase tension strings, and lower phase tension strings; jumpers include outer angle phase jumpers, inner angle phase jumpers, and lower phase jumpers, between the lower phase tension strings and the lower phase tension strings. Installed with extension ring. The utility model changes the vertical inverted triangle of the hanging point of the tension tower into an inclined inverted triangle, achieves a change in the structure of the electric field space, and improves the clearance distance of the voltage equalizing ring installed between the outer angle phase jumper and the lower angle phase tension wire.

Description

Optimal structure of phase-to-phase distance of a compact transmission line tension tower

technical field

The utility model relates to a green power transmission technology, in particular to an improved structure of the phase-to-phase electrical distance of tension towers in the application of compact power transmission technology in mountainous areas.

Background technique

The compact transmission line (The compact transmission line) is a green and environmentally friendly power transmission technology with high natural power transmission, less occupied transmission corridors, and less unit investment. Using this technology can realize long-distance, large-capacity, and cross-regional power transmission. This power transmission technology was designed and built in the Beijing area in the 1990s for the first experimental power transmission project (500kV Changfang Line). In 2004, it was designed and built in the fourth power transmission project of China Southern Power Grid from Tianshengqiao to Guangzhou. This type of experimental power transmission project (also the second compact power transmission project in China), this power transmission technology is a new technology that has just started, and it has been used in the cloud power transmission project of China Southern Power Grid Corporation, the Guizhou power transmission project and Henan etc. There are applications in the ground grid. Compared with conventional power transmission technology, this power transmission technology is more economical, can save a lot of power transmission corridors, and is green and environmentally friendly. However, in the design and use of mountainous areas, due to the large height difference between the towers and the compact electric field space, when the insulators of the tension towers "hang upside down", there will be an engineering defect that the phase-to-phase distance cannot meet the safety distance. At present, there are no compact transmission lines in China. An effective new solution to this shortcoming.

There are several schemes for optimizing the interphase distance between strain towers of compact transmission lines:

1. Changing the tower structure of the outer corner phase jumper bracket means changing the position of the outer corner phase jumper bracket and increasing the height of the jumper hanging point to increase the height difference between the jumper wire hanging point and the "end" of the lower corner phase wire hanging point. In order to optimize the distance between phases. However, from the perspective of lightning protection, improving the jumper bracket will increase the lightning protection angle, and the increase in the jumper protection angle will reduce the lightning protection level of the transmission line. From the perspective of force analysis, this method needs to change the installation position of the tower jumper bracket, and also changes the steel structure of the tower, and needs to redesign and check the new tower type. Further research into better methods is required.

The second is to adopt the measures of tightening the jumper or increasing the hard jumper. The measure of using the hard jumper is the same as the measure of tightening the jumper to reduce the sag. It can increase the distance between the phases to a certain extent. But tightening the jumper to reduce the sag of the jumper is limited to increase the distance between the phases here, because the method of tightening the jumper to reduce this distance is not ideal for the defect treatment of the Tianguang four-circuit compact power transmission project, and cannot If this hidden danger is completely eliminated, this distance will still be reduced in natural environments such as strong winds and ice walking, threatening the safety of the power grid.

From the analysis of jumper and jumper insulator wind deflection, increasing the hard jumper will increase the wind receiving area, the jumper wind deflection will increase, and the offset of the jumper will change the distance between it and the voltage equalizing ring of the lower angle phase conductor in strong winds. The phase-to-phase distance and the phase-to-ground distance between the jumper and the tower. So adopting this measure is not the best.

The two methods of changing the tower structure of the outer corner phase jumper bracket and using hard jumper are not ideal optimization measures. The former reduces the level of lightning protection and changes the steel structure of the tension tower. It is necessary to redesign and check the new tower type, and the latter is tightened. The distance is limited, the wind surface is increased, and the practical problem cannot be completely solved.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide an electric field structure optimization scheme, which can eliminate the defect that the minimum distance formed by the outer corner jumper wire of the strain tower of the compact transmission line and the lower corner tension wire does not meet the safety requirements, and reduce the If the distance between the tension towers of the compact transmission line is too small, it may cause the safety risk of the short circuit between the phases. For the application of this green transmission technology in the plateau mountainous environment, optimization measures are proposed to improve the safety level of the power grid.

For realizing above object, the technical scheme that the utility model takes is:

An optimized structure for the phase-to-phase distance of a tension tower of a compact transmission line. The tension tower includes a tower foot, a tower body, a tower head, a jumper insulator string, a tension string and a jumper. The tower foot and the tower head are respectively Located on the upper and lower sides of the tower body; the tower head includes three-layer cross-arms fixed on the tower body, and the three-layer cross-arms are the upper cross-arm, the middle cross-arm and the lower cross-arm from top to bottom, wherein, The upper cross arm includes outer corner side ground wire brackets, inner corner side ground wire brackets and inner corner phase jumper wire brackets located outside the inner corner side ground wire brackets on both sides of the tower body, and the middle cross arm includes The outer angle phase wire bracket on the lower side of the ground wire support, the inner angle phase wire bracket located on the lower side of the inner angle side ground wire bracket, and the outer angle phase jumper bracket arranged outside the outer angle phase wire bracket. The lower side of the wire support; the jumper insulator string includes the inner angle phase jumper insulator string hanging on the lower side of the inner angle phase jumper bracket, the outer angle phase jumper insulator string hanging on the outer angle phase jumper bracket, and the outer angle phase jumper insulator string hanging on the lower cross arm The lower phase jumper insulator string on the lower side; the tension string includes the outer angle phase tension string, the inner angle phase tension string and the lower phase tension string. The hanging point of the tension string and the hanging point of the lower phase tension string are respectively connected with the outer angle phase wire support, the inner angle phase wire bracket and the tower body, and their other ends are respectively provided with the first tension wire for the outer angle phase tension string to be connected with the first tension wire. A connection point, a second connection point for the inner corner phase tension string to be connected to the second tension wire, and a third connection point for the lower phase tension string to be connected to the third tension wire, the first connection point, the second A vertical inverted triangle is formed between the connection point and the third connection point; the jumper includes the outer corner phase jumper connected to the first connection point and the lower end of the outer corner phase jumper insulator string, and the outer corner phase jumper connected to the second connection point and the inner corner phase The inner angle phase jumper at the lower end of the jumper insulator string, and the lower phase jumper connected between the third connection point and the lower phase jumper insulator string, between the lower phase tension string and the hanging point of the lower phase tension string An extension ring is installed to keep the charged body of the wire away from the tower body.

The length of the extension ring is not less than 1.2m.

The utility model staggers the minimum space distance formed by the voltage equalizing shielding ring of the three-phase wires, and also staggers the spatial positions of the outer corner jumper wires and the lower phase tension wires. This optimization method is relatively simple, does not need to change the existing tower structure, and does not need to do line lightning protection calculations, and the optimization effect is the best.

Compared with the prior art, the utility model has the following advantages: the design of the utility model adopts dislocation wiring not under the same vertical plane, and it is a new optimized structure for the distance between the tension towers of the compact transmission line. The technology is perfected in areas with large height differences in mountainous areas. Through the optimization of the phase distance, its safe and stable operation can be greatly improved. When it has been completed and put into operation and it is found that there is a distance between phases that does not meet the requirements for safe operation, the operation and maintenance unit can learn from this method to optimize. For new compact transmission lines, the situation of insufficient distance between phases should be fully considered and checked during design. Use This optimization method is optimized; construction and operation should also strengthen this distance management, so as to realize the comprehensive promotion and application of compact power transmission technology throughout the country and improve safety.

Description of drawings

Fig. 1 is a schematic diagram of the optimized structure of the phase-to-phase distance of the compact transmission line tension tower of the utility model.

Among them: 1. Tower foot; 2. Tower body; 31. Outer angle side ground wire bracket; 32. Inner angle side ground wire bracket; 33. Inner angle phase jumper bracket; 41. Outer angle phase wire bracket; 42. Inner angle phase wire bracket; 43. Outer angle phase jumper bracket; 5. Lower cross arm; 61. Inner angle phase jumper insulator string; 62. Outer angle phase jumper insulator string; 63. Lower phase jumper insulator string; 71. Outer angle phase tension string; 711 , the first connection point; 712, the hanging point of the outer angle phase tension string; 72, the inner angle phase tension string; 721, the second connection point; 722, the inner angle phase tension string hanging point; 73, the lower phase tension string; 731 , the third connection point; 732, the lower phase tension string hanging point; 81, the outer angle phase jumper; 82, the inner angle phase jumper; 83, the lower phase jumper; 9, the extension ring.

Detailed ways

The content of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example

Please refer to Fig. 1 , an optimized structure of the phase-to-phase distance of a tension tower of a compact transmission line. The tension tower includes a tower foot 1, a tower body 2, a tower head, jumper insulator strings, tension strings and jumpers. The tower foot 1 and the tower head are located on the upper and lower sides of the tower body 2 respectively.

The tower head is fixed on the tower body 2, and it includes three-layer cross-arms, and the three-layer cross-arms are an upper cross-arm, a middle cross-arm and a lower cross-arm 5 from top to bottom. Wherein, the upper cross arm includes the outer angle side ground wire bracket 31, the inner angle side ground wire bracket 32 and the inner angle phase jumper wire bracket 33 outside the inner angle side ground wire bracket 32 respectively located on both sides of the tower body 2; The outer angle phase wire bracket 41 arranged on the lower side of the outer angle side ground wire bracket 31, the inner angle phase wire bracket 42 located on the lower side of the inner angle side ground wire bracket 32, and the outer angle phase jumper wire bracket 43 arranged outside the outer angle phase wire bracket 41; The lower cross arm 5 is correspondingly arranged on the lower side of the inner angle-phase wire support 42 .

The jumper insulator string includes the inner angle phase jumper insulator string 61 hanging on the lower side of the inner angle phase jumper bracket 33, the outer angle phase jumper insulator string 62 hanging on the outer angle phase jumper bracket 43, and the outer angle phase jumper insulator string hanging on the lower side of the lower cross arm 5. The lower phase jumper insulator string 63.

The tension strings include an outer angle phase tension string 71, an inner angle phase tension string 72 and a lower phase tension string 73 connected to the outer angle phase wire support 41, the inner angle phase wire bracket 42, and the tower body 2 at one end, wherein the outer angle phase resistance The outer angle phase tension string hanging point 712 is formed between the tension string 71 and the outer angle phase wire support 41, the inner angle phase tension string hanging point 722 is formed between the inner angle phase tension string 72 and the inner angle phase wire support 42, and the lower phase tension string Between 73 and the tower body 2, a lower phase tension string hanging point 732 is formed, and the other ends of the outer angle phase tension string 71, the inner angle phase tension string 72 and the lower phase tension string 73 are all provided with corresponding tension wires to connect to each other. The connection points are marked as the first connection point 711, the second connection point 721 and the third connection point 731, respectively. A vertical inverted triangle is formed among the first connection point 711 , the second connection point 721 and the third connection point 731 .

The jumper includes an outer corner phase jumper 81 connected to the first connection point 711 and the lower end of the outer corner phase jumper insulator string 62, an inner corner phase jumper 82 connected to the second connection point 721 and the lower end of the inner corner phase jumper insulator string 61, and The lower phase jumper 83 is connected between the third connection point 731 and the lower phase jumper insulator string 63 .

All of the above are existing technologies, and the specific connection methods and working principles thereof will not be repeated here.

In a preferred embodiment of the utility model, in order to avoid the defect that the interphase distance cannot meet the safety distance requirements when the compact power transmission technology operates in an environment with a large altitude difference in mountainous areas, by changing the design of the assembly diagram of the three-phase insulator fittings to be inconsistent, The electric field structure of the vertical surface of the three-phase conductor relative to the zero potential of the strain tower is changed, and the electrical distance between the outer corner phase and the lower corner phase is increased. Specifically, an extension ring 9 that keeps the lower phase tension string 73 away from the tower body 2 is connected between the hanging point 732 of the lower phase tension string and the lower phase tension string 73 .

Add an extension ring so that the electrical terminal of the lower angle phase wire (that is, the end of the third connection point 731) is farther away from the tower body than the two upper angle phase terminals (respectively the first connection point 711 and the second connection point 721) (recommended 1.2 meters away or more), so that the wiring of the "end" of the three-phase wires is changed, so that the "ends" of the three-phase wires on the tension tower are no longer the same vertical plane, and the hanging points of the tension tower are vertical The "inverted triangle" is changed to an inclined "inverted triangle", which achieves the change of the structure of the electric field space, and also improves the clearance distance of the voltage equalizing ring installed between the outer corner phase jumper and the lower corner phase tension wire. At this time, the space between the two upper and lower phases is no longer on the same vertical plane, and the clearance distance between the jumper wire of the outer phase and the voltage equalizing ring of the lower phase will increase. No matter how the wind deflection of the jumper swings, the The clearance distance between the jumper and the voltage equalizing ring of the lower angle phase has little effect. From the perspective of wire galloping, adding an extension ring has little effect on the wire and can be ignored.

The above-mentioned embodiments only express the optimal design of the present utility model, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the present utility model. It should be pointed out that for those skilled in the art, without departing from the concept of the utility model, some deformations and improvements such as adding insulators to the lower phase can be made, all of which belong to the protection scope of the utility model. Therefore, the protection scope of the present utility model should be based on the appended claims.

Claims (2)

1. A phase-to-phase distance optimization structure of a compact transmission line tension tower, the tension tower includes a tower foot (1), a tower body (2), a tower head, a jumper insulator string, a tension string and a jumper, The tower foot (1) and tower head are respectively located on the upper and lower sides of the tower body (2); the tower head includes a three-layer cross arm fixed on the tower body (2), and the three-layer cross arm is formed by To the bottom are the upper cross arm, the middle cross arm and the lower cross arm (5), wherein the upper cross arm includes outer corner side ground wire brackets (31) and inner corner side ground wire brackets (31) respectively located on both sides of the tower body (2). The bracket (32) and the inner corner phase jumper bracket (33) located outside the inner corner side ground wire bracket (32), the middle cross arm includes the outer corner phase wire bracket ( 41), the inner angle phase wire bracket (42) located on the lower side of the inner angle side ground wire bracket (32), and the outer angle phase jumper bracket (43) arranged outside the outer angle phase wire bracket (41), the lower cross arm ( 5) Corresponding to the lower side of the inner angle phase wire support (42); the jumper insulator string includes the inner angle phase jumper insulator string (61) hanging on the lower side of the inner angle phase jumper bracket (33), and the outer angle phase The outer angle jumper insulator string (62) of the jumper bracket (43) and the lower phase jumper insulator string (63) hanging on the lower side of the lower cross arm (5); the tension string includes the outer angle phase tension string ( 71), inner angle phase tension strings (72) and lower phase tension strings (73), one end of which respectively passes through the outer angle phase tension string hanging point (712), the inner angle phase tension string hanging point (722), the lower phase The tension string hanging point (732) is connected with the outer angle phase wire support (41), the inner angle phase wire bracket (42) and the tower body (2) respectively, and their other ends are respectively provided with the outer angle phase tension string (71) and The first connection point (711) connected to the first tension wire, the second connection point (721) used to connect the inner angle phase tension string (72) to the second tension wire, and the second connection point (721) for the lower phase tension string (73) to connect with the second tension wire The third connection point (731) connected to the third tension wire, the first connection point (711), the second connection point (721) and the third connection point (731) form a vertical inverted triangle; The jumper includes an outer corner phase jumper (81) connected to the first connection point (711) and the lower end of the outer corner phase jumper insulator string (62), connected to the second connection point (721) and the inner corner phase jumper insulator string (61 ) the inner angle phase jumper (82) at the lower end, and the lower phase jumper (83) connected between the third connection point (731) and the lower phase jumper insulator string (63), it is characterized in that the lower phase An extension ring (9) is installed between the tension string (73) and the hanging point (732) of the lower phase tension string. 2. The interphase distance optimization structure of the strain tower of compact transmission line according to claim 1, characterized in that the length of the extension ring (9) is not less than 1.2m.

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