CN206053506U - A kind of transmission line tangent tower - Google Patents

Abstract

The utility model discloses a kind of transmission line tangent tower.The tangent tower is used to exchange double back transmission line, including tower body；Two of the top for being fixed on tower body crank arm；It is separately fixed at the upper left wire cross-arm and upper right wire cross-arm at two tops cranked arm；And be separately fixed at two crank arm on lower-left wire cross-arm and bottom right wire cross-arm；Upper left phase conductor hanging point, upper right phase conductor hanging point, lower-left phase conductor hanging point and bottom right phase conductor hanging point are respectively arranged with upper left wire cross-arm, upper right wire cross-arm, lower-left wire cross-arm and bottom right wire cross-arm；Upper phase conductor hanging point lower phase conductor hanging point with being provided with cranking arm；Upper left phase conductor hanging point, upper right phase conductor hanging point and in upper phase conductor hanging point be located in the same horizontal plane；Lower-left phase conductor hanging point, bottom right phase conductor hanging point and in lower phase conductor hanging point be located in the same horizontal plane.In the tangent tower, the wire on two loop line roads is horizontally disposed, and tower height is greatly reduced, and meets the requirement in height-limit area or strong wind area.

Description

A transmission line straight tower

technical field

The utility model relates to the technical field of iron towers for transmission lines, in particular to a straight line tower for transmission lines.

Background technique

The straight line tower is an important iron tower for transmission lines, which is mainly used to carry the gravity of the wire.

At present, the tower type of the straight tower used for the AC double-circuit transmission line is an umbrella tower or a drum tower. As shown in Figure 1, the existing AC double-circuit linear tower includes: a tower body 1a, three conductor cross-arms 2a arranged in sequence from the top of the tower body 1a, the three conductor cross-arms 2a are parallel to each other, and two adjacent The distance between the wire cross arms 2a can accommodate the wire gap circle 6a. The two ends of the uppermost conductor cross-arm 2a are also provided with ground frames 3a. Both ends of each wire cross arm are provided with wire hanging points 5a, and each wire hanging point 5a is hung with an I-type insulator string 4a. The three insulator strings 4a on one side of the AC double-circuit tower hang the three wires of one circuit in the AC double-circuit, and the three insulator strings 4a on the other side hang the three wires of the other circuit in the AC double-circuit, that is, The two circuits of the AC double circuit are vertically arranged in the upper, middle and lower phases.

In the process of realizing the utility model, the designer found at least the following problems in the prior art: the total height of the existing linear towers used for AC double-circuit transmission lines is relatively large, and cannot meet the needs of airport take-off and landing areas, radar stations, intersections, etc. The requirement of drilling through transmission lines and other height-limited areas that have strict restrictions on the height of iron towers restricts the path of transmission lines. At the same time, for windy areas (wind speed above 37m/s at a height of 10m), due to the large total height of the iron tower, the weight of the iron tower is greatly affected by the wind load, which leads to an increase in the overall cost of the project.

Utility model content

In order to solve the above technical problems, the utility model provides a straight line tower for transmission lines with a lower overall height and can meet the requirements for transmission line towers in height-limited areas or strong wind areas.

Specifically, the following technical solutions are included:

The embodiment of the utility model provides a transmission line straight tower, which is used for AC double-circuit power transmission lines. The transmission line straight tower includes:

Tower;

two curved arms fixed on the top of the tower, and a wine glass-shaped space is formed between the two curved arms;

The upper left wire cross-arm and the upper right wire cross-arm respectively fixed on the tops of the two curved arms;

as well as,

The left lower conductor cross-arm and the right lower conductor cross-arm respectively fixed on the two crank arms and located below the left upper conductor cross-arm and the right upper conductor cross-arm;

Both the upper left conductor cross-arm and the upper right conductor cross-arm are provided with grounding frames;

The left upper conductor cross arm, the right upper conductor cross arm, the left lower conductor cross arm, and the right lower conductor cross arm are respectively provided with a left upper phase conductor hanging point, a right upper phase conductor hanging point, and a left lower phase conductor hanging point. And the hanging point of the lower right phase wire;

The crank arm is provided with hanging points for middle and upper phase wires and hanging points for middle and lower phase wires;

The hanging point of the upper left phase wire, the hanging point of the upper right phase wire and the hanging point of the upper middle phase wire are located in the same horizontal plane;

The hanging point of the lower left phase wire, the hanging point of the lower right phase wire and the hanging point of the middle and lower phase wire are located in the same horizontal plane.

Further, the hanging point of the upper left phase wire, the hanging point of the upper right phase wire, the hanging point of the lower left phase wire and the hanging point of the lower right phase wire are hung with a first insulator string;

A second insulator string is suspended from the hanging point of the middle and upper phase wires and the hanging point of the middle and lower phase wires.

Further, the first insulator string is an I-type insulator string, and the second insulator string is a V-type insulator string.

Further, the hanging point of the upper left phase conductor is set at the end of the upper left conductor crossarm, the hanging point of the upper right phase conductor is set at the end of the upper right conductor crossarm, and the hanging point of the lower left phase conductor is set at The end of the lower left conductor cross-arm, the hanging point of the lower right phase conductor is set at the end of the lower right conductor cross-arm.

Further, the included angles between the left and right parts of the V-shaped insulator string and the vertical direction are equal.

Further, the two curved arms include an upper curved arm and a lower curved arm; the lower curved arm is fixed on the tower body, and the upper curved arm is fixed on the top of the lower curved arm.

Further, the lower left wire cross arm and the right lower wire cross arm are fixed on the upper crank arm.

Further, the straight tower of the transmission line also includes:

A center wire cross arm fixed on the top of the two curved arms and located between the two curved arms;

The lower surface of the cross arm of the neutral wire is arched.

Further, the cross-sectional area of the tower gradually decreases from bottom to top.

The beneficial effect of the technical scheme that the utility model embodiment provides is:

The embodiment of the utility model provides a straight line tower for a power transmission line, specifically a straight line tower for an AC double-circuit power transmission line. In the straight tower of the transmission line, wire hanging points for hanging the six wires of the AC double-circuit transmission line are respectively set on the left upper wire cross arm, the right upper wire cross arm, the left lower wire cross arm, the right lower wire cross arm and the curved arm. The two circuits are arranged horizontally in three phases of left, middle and right, thereby greatly reducing the height of the tower and meeting the requirements for the height of the tower in height-limited areas such as airport take-off and landing areas, radar stations, and cross-drilling transmission lines. At the same time, for the strong wind area, because the height of the iron tower is reduced, the influence of wind load on the weight of the iron tower is reduced, the weight of the iron tower is reduced, the overall cost of the hypothetical project of the transmission line is reduced, and the economical efficiency of the transmission line project in the strong wind area is improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of existing AC double-circuit linear tower;

Fig. 2 is a schematic structural view of a transmission line straight tower provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a transmission line straight tower provided by another embodiment of the present invention.

The reference signs in the figure represent respectively:

1 - tower body;

211-left upper wire cross arm; 212-right upper wire cross arm; 213-middle wire cross arm;

221-left lower wire cross arm; 222-right lower wire cross arm;

3- ground frame;

41-the first insulator string; 42-the second insulator string;

511-hanging point of upper left phase wire; 512-hanging point of upper right phase wire; 513-hanging point of upper middle phase wire;

521-hanging point of the lower left phase wire; 522-hanging point of the lower right phase wire; 523-hanging point of the middle and lower phase wire;

6- wire clearance circle;

7-curved arm; 71-upper curved arm; 72-lower curved arm;

1a - the tower body of the existing AC double-circuit straight line tower;

2a- Conductor crossarm of the existing AC double-circuit straight line tower;

3a- The ground frame of the existing AC double-circuit linear tower;

4a-The insulator string of the existing AC double-circuit linear tower;

5a-The wire hanging point of the existing AC double-circuit straight line tower;

6a-The conductor clearance circle of the existing AC double-circuit linear tower.

detailed description

In order to make the technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

The embodiment of the utility model provides a transmission line straight tower, which is used for AC double-circuit transmission lines. Referring to Fig. 2 and combined with Fig. 3, the transmission line straight tower specifically includes:

tower body 1;

Two curved arms 7 fixed on the top of the tower body 1 form a wine glass-shaped space between the two curved arms 7;

The upper left wire cross arm 211 and the upper right wire cross arm 212 respectively fixed on the tops of the two curved arms 7;

as well as,

The lower left wire cross arm 221 and the right lower wire cross arm 222 are respectively fixed on the two crank arms 7 and located below the left upper wire cross arm 211 and the right upper wire cross arm 212 .

Both the upper left wire cross arm 211 and the upper right wire cross arm 212 are provided with a ground frame 3 .

Left upper conductor cross arm 211, right upper conductor cross arm 212, left lower conductor cross arm 221 and right lower conductor cross arm 222 are respectively provided with left upper phase conductor hanging point 511, right upper phase conductor hanging point 512, left lower phase conductor hanging point 521 and The hanging point 522 of the lower right phase conductor.

The crank arm 7 is provided with a hanging point 513 for the middle and upper phase wires and a hanging point 523 for the middle and lower phase wires.

The hanging point 511 of the upper left phase wire, the hanging point 512 of the upper right phase wire and the hanging point 513 of the upper middle phase wire are located in the same horizontal plane.

The hanging point 521 of the lower left phase wire, the hanging point 522 of the lower right phase wire and the hanging point 523 of the middle and lower phase wire are located in the same horizontal plane.

In the embodiment of the utility model, the wine glass-shaped straight tower is applied to the erection of AC double-circuit transmission line conductors, so as to realize double circuits on the same tower and reduce the total height of the iron tower. Specifically, in the embodiment of the utility model, two curved arms 7 are respectively fixed with two wire cross-arms along the vertical direction, that is, the upper left wire cross-arm 211, the right upper wire cross-arm 212, the left lower wire cross-arm 221 and The lower right conductor cross arm 222 is respectively provided with the left upper phase conductor hanging point 511 and the right upper phase conductor hanging point 512 on the left upper conductor cross arm 211 , the right upper conductor cross arm 212 , the left lower conductor cross arm 221 and the right lower conductor cross arm 222 respectively. , the hanging point 521 of the lower left phase wire and the hanging point 522 of the lower right phase wire. A hanging point 513 for the middle and upper phase wires and a hanging point 523 for the middle and lower phase wires are arranged vertically on the crank arm 7 . Among them, the hanging point 511 of the upper left phase wire, the hanging point 512 of the upper right phase wire and the hanging point 513 of the upper middle phase wire are located in the same horizontal plane to fix the three wires of one circuit in the two circuits; The phase wire hanging point 522 and the middle and lower phase wire hanging point 523 are also located in the same horizontal plane to fix the three wires of the other circuit in the two circuits, so that the two circuits are arranged horizontally in three phases of left, middle and right. Compared with the existing umbrella-shaped or drum-shaped straight tower, the total height of the straight tower provided by the embodiment of the utility model is greatly reduced, which meets the requirements for the height of the tower in the height-limited areas such as airport take-off and landing areas, radar stations, and cross-drilling transmission lines. requirements. At the same time, for the strong wind area, due to the reduction of the height of the iron tower, the influence of wind load on the weight of the iron tower is reduced, the weight of the iron tower is reduced, the overall cost of the hypothetical project of the transmission line is reduced, and the economical efficiency of the transmission line project in the strong wind area is improved.

The transmission line straight tower provided by the embodiment of the utility model is suitable for AC double-circuit transmission lines of various voltage levels. It can be reduced by 19-21m, the line corridor can be increased by 15-18m, and the tower weight can be reduced by 4%-5%; when applied to 500kV ultra-high voltage projects, the tower height can be reduced by 11-13m, the line corridor can be increased by 9-11m, and the tower weight can be reduced by 3%- 5%; other voltage levels have similar benefits.

Although the transmission line straight tower provided by the embodiment of the utility model has an increased width of the line corridor compared with the existing AC double-circuit straight tower, the height-limited area and the windy area are usually relatively open areas. For such areas, the width of the line corridor is no longer a controlling factor affecting the economics of the project. Therefore, the increase in the width of the line corridor does not affect the economical advantages of the linear tower provided by the embodiment of the utility model.

It should be noted that, in the embodiment of the present utility model, the upper left conductor cross arm 211 and the left lower conductor cross arm 221 are fixed on a crank arm 7, and the upper right conductor cross arm 212 and the right lower conductor cross arm 222 are fixed on a crank arm 7. , and those skilled in the art can understand that the wire cross arms on the two curved arms 7 are fixed on the opposite sides of the two curved arms 7 . Since two wires pass through the space between the two curved arms 7 in the AC double-circuit transmission line, the space between the two curved arms 7 should be able to accommodate the wire gap circle 6 of the two wires. In addition, the distance between the upper left conductor cross-arm 211 and the lower left conductor cross-arm 221 and the distance between the upper right conductor cross-arm 212 and the lower right conductor cross-arm 222 should also be able to accommodate the conductor clearance circle 6 .

Further, those skilled in the art can understand that the ground frame 3 is provided with a ground wire hanging point for hanging the ground wire. The setting of the ground wire should meet the requirements for the protection angle of the wire.

Further, in the embodiment of the utility model, the hanging point 511 of the upper left phase wire, the hanging point 512 of the upper right phase wire, the hanging point 521 of the lower left phase wire and the hanging point 522 of the lower right phase wire are all hung with the first insulator string 41 for fixing the wire, The second insulator string 42 for fixing the wires is suspended from the hanging point 513 of the middle and upper phase wires and the hanging point 523 of the middle and lower phase wires.

Wherein, the first insulator string 41 is preferably an I-type insulator string, and the second insulator string 42 is preferably a V-type insulator string.

At this time, the hanging point 511 of the upper left phase conductor is preferably arranged at the end of the upper left conductor cross arm 211, the hanging point 512 of the upper right phase conductor is preferably arranged at the end of the upper right conductor cross arm 212, and the hanging point 521 of the lower left phase conductor is preferably arranged at the lower left conductor At the end of the cross arm 221 , the hanging point 522 of the lower right phase conductor is preferably arranged at the end of the lower right conductor cross arm 222 .

The number of hanging points 513 of the middle and upper phase wires and the number of hanging points 523 of the middle and lower phase wires are two, which are respectively arranged on the two curved arms 7, and the left and right ends of the V-shaped insulator string are fixed on the two curved arms 7 respectively. superior. Moreover, the included angles between the left and right parts of the V-shaped insulator string and the vertical direction are equal. Adopting such a wire-hanging method is beneficial to improving the wind resistance capacity of the linear tower provided by the embodiment of the present invention, and is more suitable for the requirements of strong wind areas.

Furthermore, in the linear tower of the transmission line provided by the embodiment of the present utility model, the two curved arms 7 both include an upper curved arm 71 and a lower curved arm 72 . Wherein, the lower curved arm 72 is fixed on the tower body 1, the upper curved arm 71 is fixed on the top of the lower curved arm 72, the upper left conductor cross arm 211 and the upper right conductor cross arm 212 are fixed on the top of the upper curved arm 71, and the lower left conductor cross arm 221 And the lower right conductor cross arm 222 is fixed on the upper crank arm 71 , and the middle and upper phase conductor hanging point 513 and the middle and lower phase conductor hanging point 523 are also arranged on the upper crank arm 71 .

Further, in the linear tower of the transmission line provided by the embodiment of the present utility model, a middle conductor cross-arm 213 is also arranged between the two crank arms 7, and the middle conductor cross-arm 213 is located at the top of the crank arm 7 (the top of the upper crank arm 71 ), are in the same horizontal plane with the upper left conductor cross arm 211 and the upper right conductor 212. The lower surface of the middle conductor cross arm 213 is preferably set in an arched shape, which can increase the area of the space enclosed between the middle conductor cross arm 213 and the two curved arms 7, while satisfying the electrical clearance of the conductor, it is beneficial to further reduce the The tower is high.

Further, in the linear tower of the transmission line provided by the embodiment of the utility model, the tower body 1 has a trapezoidal structure as a whole, that is, the cross-sectional area of the tower body 1 gradually decreases from bottom to top, so as to make the linear tower more stable as a whole.

According to the calculation and analysis of the linear tower provided by the embodiment of the utility model, its calculation working conditions, structural connection, bearing capacity, and processing and manufacturing can all meet the existing regulations and specifications.

To sum up, in the embodiment of the utility model, the wine glass-shaped straight tower is applied to the erection of AC double-circuit transmission line conductors, which provides a reasonable structure, simple structure, strong safety and flexibility, and has the advantages of being suitable for height-limited areas or strong wind areas. Straight line tower with good adaptability and economy. In this straight line tower, the two circuits are horizontally arranged in three phases of left, middle and right. Under the premise of satisfying the conductor discharge gap, the minimum insulator string length and the influence of the electromagnetic environment, the horizontal line spacing and vertical line spacing of the conductors are compressed to the optimum. , greatly reducing the total height of the tower, meeting the requirements for the height of the tower in height-limited areas such as airport take-off and landing areas, radar stations, and cross-drilling transmission lines. At the same time, due to the engineering characteristics of the straight line tower in the windy area, the impact of the strong wind on the weight of the tower is reduced, and the advantages of the line corridor in the open area are fully utilized to reduce the overall cost of the hypothetical project of the transmission line and improve the economy of the transmission line project in the windy area.

The above description is only for those skilled in the art to understand the technical solution of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (9)

1. A transmission line straight tower, used for AC double-circuit transmission lines, is characterized in that, comprising: tower body (1); Two curved arms (7) fixed on the top of the tower body (1), forming a wine glass-shaped space between the two curved arms (7); The upper left wire cross arm (211) and the upper right wire cross arm (212) respectively fixed on the tops of the two curved arms (7); as well as, The lower left wire cross arm (221) and the lower right wire cross arm (212) are respectively fixed on the two curved arms (7) and located below the upper left wire cross arm (211) and the upper right wire cross arm (212). (222); Both the upper left wire cross arm (211) and the upper right wire cross arm (212) are provided with a ground wire frame (3); The upper left conductor cross arm (211), the upper right conductor cross arm (212), the left lower conductor cross arm (221) and the right lower conductor cross arm (222) are respectively provided with hanging points for the left upper phase conductor (511), upper right phase wire hanging point (512), left lower phase wire hanging point (521) and right lower phase wire hanging point (522); The crank arm (7) is provided with hanging points (513) for middle and upper phase wires and hanging points (523) for middle and lower phase wires; The hanging point of the upper left phase wire (511), the hanging point of the upper right phase wire (512) and the hanging point of the upper middle phase wire (513) are located in the same horizontal plane; The hanging point of the lower left phase wire (521), the hanging point of the lower right phase wire (522) and the hanging point of the lower middle phase wire (523) are located in the same horizontal plane. 2. The linear tower of transmission line according to claim 1, characterized in that, the hanging point (511) of the upper left phase wire, the hanging point (512) of the upper right phase wire, and the hanging point (521) of the lower left phase wire And the hanging point (522) of the lower right phase wire is suspended with a first insulator string (41); A second insulator string (42) is suspended from the hanging point (513) of the middle and upper phase wires and the hanging point (523) of the middle and lower phase wires. 3. The transmission line straight tower according to claim 2, characterized in that, the first insulator string (41) is an I-type insulator string, and the second insulator string (42) is a V-type insulator string. 4. The transmission line straight tower according to claim 3, characterized in that, the hanging point (511) of the upper left phase wire is arranged at the end of the cross arm (211) of the upper left phase wire, and the hanging point of the upper right phase wire (512) is set at the end of the upper right conductor cross arm (212), the left lower phase conductor hanging point (521) is set at the end of the left lower conductor cross arm (221), and the right lower phase conductor hangs A point (522) is provided at the end of the lower right wire cross-arm (222). 5 . The straight tower of power transmission line according to claim 3 , characterized in that, the included angles between the left and right parts of the V-shaped insulator string and the vertical direction are equal. 6 . 6. The linear tower of transmission line according to claim 1, characterized in that, two said curved arms (7) all comprise an upper curved arm (71) and a lower curved arm (72); said lower curved arm (72) ) is fixed on the tower body (1), and the upper curved arm (71) is fixed on the top of the lower curved arm (72). 7. The transmission line straight tower according to claim 6, characterized in that, the lower left conductor cross arm (221) and the right lower conductor cross arm (222) are fixed on the upper crank arm (71). 8. The transmission line straight tower according to claim 1, wherein the transmission line straight tower further comprises: A center conductor cross-arm (213) fixed on the top of the two curved arms (7) and located between the two curved arms (7); The lower surface of the center wire cross arm (213) is arched. 9. The transmission line straight tower according to claim 1, characterized in that the cross-sectional area of the tower body (1) decreases gradually from bottom to top.