CN105155908A - Heavy icing area alternating current strain tower in shape like Chinese character 'gan' - Google Patents

Abstract

The invention discloses a heavy icing area alternating current strain tower in a shape like the Chinese character 'gan' and belongs to the technical field of iron towers for power transmission lines. The strain tower in the shape like the Chinese character 'gan' comprises a tower body (3), a ground wire cross arm (1) and a guide wire cross arm (2), wherein the ground wire cross arm (1) and the guide wire cross arm (2) are arranged on the tower body (3), and the ground wire cross arm (1) is positioned above the guide wire cross arm (2); side phase guide wire suspending points (9) are respectively arranged on the two sides of the guide wire cross arm (2); a middle phase guide wire suspending point (10) is arranged on the tower body (3); a first ground wire cross arm jumper holder (401) is arranged on one side of the ground wire cross arm (1), and a middle phase guide wire jumper string (11) is suspended on the first ground wire cross arm jumper holder (401); and the side phase guide wire suspending points (9) and the middle phase guide wire suspending point (10) are positioned on the same horizontal plane. As side phase guide wires and a middle phase guide wire of the strain tower in the shape like the Chinese character 'gan' are horizontally arranged, short-circuiting caused by the too-short distance between the side phase guide wires and the middle phase guide wire due to deicing jump is prevented, and the running safety of the heavy icing area power transmission lines is improved.

Description

An AC dry-shaped strain tower in the heavy ice area

technical field

The invention relates to the technical field of iron towers for power transmission lines, in particular to an AC dry-type tension tower in heavy ice regions.

Background technique

The iron towers for transmission lines can be divided into various categories according to the different functions and uses of the iron towers in the transmission lines. Among them, the strain tower is not only used to support the gravity of the wire and the ground wire, but also bears the tension of the wire and the ground wire. The dry-type strain tower is the most commonly used type of AC single-circuit strain tower at present.

As shown in FIG. 1 , the existing AC dry-shaped strain tower includes: a tower body 3 , a ground wire cross arm 1 and a wire cross arm 2 . Both sides of the conductor cross arm 2 are respectively provided with hanging points 9 for the side phase conductors, and hanging points 10 for the middle phase conductors are set on the tower body 3, and the hanging points 10 of the tower body are located above the hanging points 9 of the cross arm. The two side-phase conductors 6 are respectively suspended at the hanging point 9 of the side-phase conductors, the middle-phase conductor 5 is hung at the hanging point 10 of the middle-phase conductor, and the three-phase conductors are arranged in a triangle as a whole. One end of the ground wire cross arm 1 is provided with a ground wire cross arm jumper 4, and the middle phase wire jumper 7 is wound up to the ground wire cross arm jumper 4, and the two side phase wire jumpers 8 adopt a lower jumper method. The dry-shaped tension tower has the advantages of simple structure, clear force transmission, strong deformation resistance, small occupied line corridor, and convenient construction, installation and maintenance.

In the process of realizing the present invention, the inventors have found that at least the following problems exist in the prior art: when the existing AC dry-type strain tower is applied to a heavy ice area with an ice thickness of more than 20 mm, due to asynchronous Jumping off the ice, the distance between the middle phase conductor and the side phase conductor may be too small, which is prone to short circuit and poses a safety hazard.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides an AC dry-shaped strain tower in heavy ice regions that can avoid too small a distance between the middle-phase conductor and the side-phase conductor.

Specifically, the following technical solutions are included:

An AC dry-shaped strain tower in a heavy ice area, the dry-shaped strain tower includes: a tower body, a ground wire cross arm, and a wire cross arm; the ground wire cross arm and the wire cross arm are arranged on the tower body , and the ground wire cross-arm is located above the wire cross-arm; side-phase wire hanging points are respectively set on both sides of the wire cross-arm; middle-phase wire hanging points are set on the tower body; one of the ground wire cross-arms The first ground wire cross-arm jumper is set on the side, and the middle-phase wire jumper string is suspended on the first ground wire cross-arm jumper; wherein, the hanging point of the side-phase wire and the middle-phase wire are located at the same within the horizontal plane.

Further, a second ground wire cross arm jumper is provided on the other side of the ground wire cross arm, and the first side phase wire jumper string is suspended on the second ground wire cross arm jumper.

Further, the first ground wire cross-arm jumper is located on the outer corner side of the ground wire cross-arm, and the second ground wire cross-arm wire jumper is located on the inner corner side of the ground wire cross-arm; The second side phase wire jumper string is suspended on the outer corner side of the cross arm.

Further, the first ground wire cross-arm jumper is located on the inner corner side of the ground wire cross-arm, and the second ground wire cross-arm wire jumper is located on the outer corner side of the ground wire cross-arm; the wire The second side phase wire jumper string is suspended on the inner corner side of the cross arm.

Further, the mid-phase wire jumper string is an I-type jumper string.

Further, the first side phase wire jumper string is an I-type jumper string.

Further, the second side-phase wire jumper string is an I-type jumper string or a V-type jumper string.

The beneficial effects of the technical solution provided by the embodiments of the present invention:

In the AC dry-shaped strain tower provided by the embodiment of the present invention, the hanging point of the side-phase conductors located on the cross-arm of the conductors and the hanging point of the middle-phase conductors located on the tower body are located in the same horizontal plane, so that the side-phase conductors and the middle-phase conductors are in the same horizontal plane. Arranged horizontally. When the AC dry-type strain tower is used in heavy ice areas, even if the side-phase conductor and the middle-phase conductor jump off the ice, the distance between the side-phase conductor and the middle-phase conductor can still meet the requirements, and there will be no The short circuit caused by the close distance between the phase conductor and the middle phase conductor improves the operation safety of the transmission line in the heavy ice area. In addition, the horizontal arrangement of the side-phase conductors and the middle-phase conductors can reduce the height of the iron tower, thereby reducing the weight of the tower and reducing the overall cost of the foundation. It is suitable for AC transmission lines of various voltage levels.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Figure 1 is a schematic diagram of the structure of the existing AC dry-shaped tension tower;

Fig. 2 is a schematic structural diagram of an AC dry-shaped strain tower in a heavy ice area provided by an embodiment of the present invention provided by an inner angle side phase wire jumper;

Fig. 3 is a schematic structural diagram of an AC dry-shaped strain tower in a heavy ice area provided by an embodiment of the present invention provided by an outer corner side phase conductor jumper wire.

The reference signs in the figure indicate respectively:

1. Ground wire cross arm; 2. Conductor cross arm; 3. Tower body;

4. Ground cross arm jumper;

401. The first ground wire cross-arm jumper; 402. The second ground wire cross-arm jumper;

5. Middle phase wire; 6. Side phase wire; 7. Middle phase wire jumper;

8. Side phase wire jumper;

801. Jumper wires for the phase wires on the side of the inner corner; 802. Jumper wires for the phase wires on the side of the outer corner;

9. Hanging point of side phase wire; 10. Hanging point of middle phase wire; 11. Jumper string of middle phase wire;

12. Side-phase wire jumper string;

1201, the first side-phase wire jumper string; 1202, the second side-phase wire jumper string.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides an AC dry-shaped strain tower in heavy ice areas, see Figure 2, and also refer to Figure 3, the dry-shaped strain tower includes: a tower body 3, a ground wire cross arm 1, and a wire cross arm 2. The ground wire cross arm 1 and the wire cross arm 2 are arranged on the tower body 3, and the ground wire cross arm 1 is located above the wire cross arm 2; the two sides of the wire cross arm 2 are respectively arranged Hanging point 9 for side phase wires; hanging point 10 for middle phase wires is set on the tower body 3; a first ground wire cross arm jumper 401 is set on one side of the ground wire cross arm 1, and The mid-phase wire jumper string 11 is suspended on the jumper frame 401; wherein, the hanging point 9 of the side phase wire and the hanging point 10 of the middle phase wire are located in the same horizontal plane.

In the AC dry-shaped strain tower provided by the embodiment of the present invention, the two side-phase conductors 6 are hung on the side-phase conductor hanging points 9 on both sides of the conductor cross arm 2, and the middle-phase conductor 5 is suspended on the tower body 3. The middle-phase wire hanging point 10, the middle-phase wire jumper 7 is suspended on the middle-phase wire jumper string 11. Since the hanging point 9 of the side phase conductor and the hanging point 10 of the middle phase conductor are located in the same horizontal plane, the side phase conductor 6 and the middle phase conductor 5 are arranged horizontally. Since the side-phase conductor 6 and the middle-phase conductor 5 are arranged horizontally, when the side-phase conductor 6 and the middle-phase conductor 5 jump out of ice, the distance between the side-phase conductor 6 and the middle-phase conductor 5 is easier to meet the requirements, so it will not A short circuit occurs due to the short distance between the side phase conductor and the middle phase conductor, which improves the operation safety of the transmission line in the heavy ice area. At the same time, the horizontal arrangement of the side phase wires 6 and the middle phase wires 5 can reduce the height of the iron tower, thereby reducing the weight of the tower and reducing the basic comprehensive cost.

The side-phase wire jumper 8 of the current AC dry-shaped strain tower is suspended on both sides of the wire cross-arm in the form of a lower jumper. Since the heavy ice areas with an ice thickness of more than 20mm are mostly located in mountainous areas, when the tension tower is erected on the slope, the distance from the lowest point of the side-phase wire jumper 8 on the inner or outer corner side of the tension tower to the ground will decrease. Not meeting the requirements. Therefore, on the basis of optimizing the arrangement of the side-phase conductors 6 and the middle-phase conductors 5, the embodiment of the present invention also optimizes the jumper mode of the side-phase conductor jumper 8, so that the obtained AC dry-shaped tensile Towers are more suitable for transmission lines in heavy ice areas. The specific implementation method is: set the second ground wire cross arm jumper frame 402 on the other side of the ground wire cross arm 1, and hang the first phase wire jumper string on the second ground wire cross arm jumper frame 402. 1201 , suspend the side-phase wire jumper located on one side of the high slope to the first side-phase wire jumper string 1201 .

As shown in FIG. 2 , when the inner corner side of the tension tower is a high slope terrain, the phase wire 801 on the inner corner side adopts the way of jumping up. In this case, the first ground cross-arm jumper 401 for suspending the mid-phase conductor jumper 7 is located on the outer corner side of the ground cross-arm 1, and the second ground cross-arm jumper 801 for hanging the inner corner side phase conductor. The ground wire cross-arm jumper 402 is located at the inner corner side of the ground wire cross-arm 1; at this time, the outer corner side phase wire jumper 802 adopts the lower jumper mode, which is used to hang the second side of the outer corner side phase wire jumper 802. The jumper string 1202 of side-phase wires is located at the outer corner side of the wire cross-arm 2 .

As shown in FIG. 3 , when the outer corner side of the tension tower is a high slope terrain, the phase wire 802 on the outer corner side adopts the way of jumping up. In this case, the first ground cross arm jumper 401 for suspending the middle phase wire jumper 7 is located on the outer corner side of the ground cross arm 1, and the second ground wire jumper 802 for hanging the phase wire jumper 802 on the outer corner side. The ground wire cross-arm jumper 402 is located at the outer corner side of the ground wire cross-arm 1; at this time, the inner corner side phase wire jumper 801 adopts the lower jumper mode, which is used to hang the second side of the inner corner side phase wire jumper 801. The jumper string 1202 of side-phase conductors is located at the inner corner side of the conductor cross-arm 2 .

The jumper of one side phase conductor adopts the method of jumper up, which can further reduce the height of the tower and reduce the weight of the tower. At the same time, it can also reduce the felling of trees on the side of the high slope, so as to achieve the purpose of environmental protection.

In the above-mentioned dry-shaped strain tower, the specific form of each jumper string is not specifically limited in the embodiment of the present invention, and any jumper string commonly used in the field may be used. The jumper string 11 of the middle-phase wire can adopt an I-type jumper string. As shown in FIG. 2 or FIG. 3 , two or more I-type jumper strings can be used to suspend the mid-phase wire jumper 7 . Similarly, the first side-phase wire jumper string 1201 can also be an I-type jumper string, or two or more I-type jumper strings can be used to suspend the side-phase wire jumper on the high slope side. The jumper string 1202 of the second phase wire can be an I-type jumper string or a V-type jumper string.

The AC dry type strain tower in the heavy ice area provided by the embodiment of the present invention is suitable for AC transmission lines of various voltage levels. The size of each part of the AC dry-shaped strain tower needs to be calculated according to the actual working conditions such as the voltage level of the transmission line. Those skilled in the art can understand that the size of the tower head (including the ground wire cross arm 1, the wire cross arm 2 and the ground wire cross arm jumper frame 4) is based on the clearance circle, the wire spacing of the horizontal arrangement of the wires, and the lightning protection angle of the ground wire. Determined, and meet the requirements for jumping off ice and galloping on ice. Determine the parameters such as the size of the ground wire cross arm 1, the wire cross arm 2 size, the ground wire cross arm jumper 4 size, and the ground wire cross arm vertical height distance.

Taking a 220kV voltage level transmission line as an example, the AC dry-shaped strain tower in the heavy ice area provided by the embodiment of the present invention will be further described.

Example 1

As shown in Figure 2, this embodiment provides an AC dry-shaped strain tower with high slope terrain on the inner corner side. The AC dry-shaped strain tower includes:

The tower body 3, the ground wire cross arm 1 and the wire cross arm 2; the ground wire cross arm 1 and the wire cross arm 2 are arranged on the tower body 3, and the ground wire cross arm 1 is located above the wire cross arm 2; Hanging points 9 for side-phase wires are set on the sides; hanging points 10 for middle-phase wires are set on the tower body 3, and hanging points 9 for side-phase wires and hanging points 10 for middle-phase wires are located in the same horizontal plane. The two side-phase conductors 6 are respectively hung on the corresponding side-phase conductor hanging points 9, the middle-phase conductor 5 is hung on the middle-phase conductor hanging point 10, and the side-phase conductors 6 and the middle-phase conductors 5 are arranged horizontally.

The middle-phase wire jumper 7 is wound up to the first ground wire cross-arm jumper frame 401 located on the outer corner side of the ground wire cross-arm 1 through two I-type middle-phase wire jumper strings 11 . The side phase wire jumper 801 of the inner corner is wound up through two I-type first side phase wire jumper strings 1201 to the second ground cross arm jumper frame 402 located on the inner corner side of the ground cross arm 1, and the side phase wire of the outer corner The wire jumper 802 adopts a lower jumper method, and is suspended on the outer corner side of the wire cross arm 2 through the V-shaped second side phase wire jumper string 1202 .

According to the actual working conditions, determine the parameters such as the size of the ground wire cross arm 1, the wire cross arm 2 size, the ground wire cross arm jumper 4 size, and the vertical height distance of the ground wire cross arm. The results show that, under the same working conditions, compared with the existing AC dry-shaped strain tower, the length of the ground wire crossarm 1 of the AC dry-shaped strain tower in this embodiment increases by 0.7m to 1.0m, and the wire cross The length of the tower 2 increases by 1m to 1.3m, the height of the tower head decreases by 3.0m to 3.5m, and the overall tower weight decreases by 3% to 4%, so that the foundation force is reduced by 3% to 7%, and the comprehensive cost of the foundation is reduced by 2%.

Example 2

As shown in Figure 3, this embodiment provides an AC dry-shaped strain tower in a heavy ice area with a high slope on the outer corner side. The AC dry-shaped strain tower includes:

The tower body 3, the ground wire cross arm 1 and the wire cross arm 2; the ground wire cross arm 1 and the wire cross arm 2 are arranged on the tower body 3, and the ground wire cross arm 1 is located above the wire cross arm 2; Hanging points 9 for side-phase wires are set on the sides; hanging points 10 for middle-phase wires are set on the tower body 3, and hanging points 9 for side-phase wires and hanging points 10 for middle-phase wires are located in the same horizontal plane. The two side-phase conductors 6 are respectively hung on the corresponding side-phase conductor hanging points 9, the middle-phase conductor 5 is hung on the middle-phase conductor hanging point 10, and the side-phase conductors 6 and the middle-phase conductors 5 are arranged horizontally.

The middle-phase wire jumper 7 is wound up to the first ground wire cross-arm jumper frame 401 located at the inner corner side of the ground wire cross-arm 1 through two I-type middle-phase wire jumper strings 11 . The side phase wire jumper 802 of the outer corner is wound up to the second ground cross arm jumper frame 402 located on the outer corner side of the ground cross arm 1 through two I-type first side phase wire jumper strings 1201. The wire jumper 801 adopts the lower jumper method, and is suspended on the inner corner side of the wire cross arm 2 through the V-shaped second side phase wire jumper string 1202 .

According to the actual working conditions, determine the parameters such as the size of the ground wire cross arm 1, the wire cross arm 2 size, the ground wire cross arm jumper 4 size, and the vertical height distance of the ground wire cross arm. The results show that, under the same working conditions, compared with the existing AC dry-type strain tower, the length of the ground wire crossarm 1 of the AC dry-type strain tower in this embodiment increases by 0.7m to 0.9m, and the wire cross The length of the load increases by 1m to 1.2m, the height of the tower head decreases by 3.1m to 3.5m, and the overall tower weight decreases by 3% to 5%, so that the foundation force is reduced by 5% to 8%, and the comprehensive cost of the foundation is reduced by 2% to 2.5%. .

It can be seen from the data of the above-mentioned embodiment 1 and embodiment 2 that although the length of the ground wire cross-arm 1 and the wire cross-arm 2 of the AC dry-shaped strain tower in the heavy ice area provided by the embodiment of the present invention has increased, the The height of the tower head is significantly reduced, so the overall tower weight is reduced.

In summary, the AC dry-type strain tower in the heavy ice area provided by the embodiment of the present invention has the advantages of simple structure, clear force transmission, strong deformation resistance, small occupied line corridor, and convenient construction, installation and maintenance. In addition, it can also prevent the short circuit caused by the close distance between the side phase conductor and the middle phase conductor, and has good adaptability to the transmission line in the heavy ice area, especially the heavy ice area in the mountainous area, and ensures the safe operation of the transmission line in the heavy ice area. At the same time, jumper winding the side-phase wires on the side of the high slope can effectively reduce the height of the tower, reduce the weight of the tower, reduce the felling of trees on the side of the high slope, protect the environment, and have significant comprehensive benefits.

The above description is only for those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. An AC dry-shaped strain tower in a heavy ice area, said dry-shaped strain tower comprising: tower body (3), ground wire cross arm (1) and conductor cross arm (2); said ground wire The cross arm (1) and the wire cross arm (2) are arranged on the tower body (3), and the ground wire cross arm (1) is located above the wire cross arm (2); the wire cross arm ( 2) Hanging points (9) for side-phase wires are set on both sides; hanging points (10) for middle-phase wires are set on the tower body (3); first ground wires are set on one side of the ground wire cross arm (1) A cross-arm jumper (401), on which the first ground wire cross-arm jumper (401) hangs a mid-phase wire jumper string (11); It is characterized in that, The hanging point (9) of the side phase wire and the hanging point (10) of the middle phase wire are located in the same horizontal plane. 2. The dry-shaped strain tower according to claim 1, characterized in that, the other side of the ground wire cross arm (1) is provided with a second ground wire cross arm jumper (402), and the first The jumper string (1201) of the first side phase wire is suspended on the jumper rack (402) of the cross arm of the two ground wires. 3. The dry-shaped strain tower according to claim 2, characterized in that, the first ground wire cross-arm jumper (401) is located on the outer corner side of the ground wire cross-arm (1), and the The second ground wire cross-arm jumper frame (402) is located on the inner corner side of the ground wire cross-arm (1); the second side-phase wire jumper string (1202) is suspended on the outer corner side of the wire cross-arm (2). 4. The dry-shaped strain tower according to claim 2, characterized in that, the first ground wire cross-arm jumper (401) is located at the inner corner side of the ground wire cross-arm (1), and the The second ground wire cross-arm jumper frame (402) is located on the outer corner side of the ground wire cross-arm (1); the second side-phase wire jumper string (1202) is suspended on the inner corner side of the wire cross-arm (2). 5. The dry-shaped strain tower according to claim 1, characterized in that, the jumper string (11) of the intermediate phase conductor is an I-type jumper string. 6. The dry-shaped strain tower according to claim 2, characterized in that, the jumper string (1201) of the first side-phase conductor is an I-type jumper string. 7. The dry-shaped strain tower according to claim 3 or 4, characterized in that, the second side-phase wire jumper string (1202) is an I-shaped jumper string or a V-type jumper string.