CN110644840A - A 220kV double-circuit compact windproof transmission tower on the same tower - Google Patents

Abstract

The invention relates to a 220kV same-tower double-circuit compact windproof and biased transmission tower, comprising tower legs, a tower body, a tower head and a ground wire support sequentially connected from bottom to top; the tower head comprises multiple A wire cross-arm is provided on both sides of the wire cross-arm, and the wire cross-arm composite material jumper brackets are respectively fixed on both sides; the wire cross-arm composite material jumper brackets are all connected with the six-phase wires through insulator strings. The invention greatly compresses the line corridor and the floor height of the iron tower, optimizes the space occupied by the corridor, and reduces the wind deflection flashover of the jumper.

Description

A 220kV double-circuit compact windproof transmission tower on the same tower

technical field

The invention relates to the technical field of power transmission towers, and more particularly, to a 220kV double-circuit compression type windproof and biased power transmission tower on the same tower.

Background technique

With the rapid development of urban construction, land has become an increasingly scarce resource, and the selection of line corridors has become the primary problem in transmission line construction. The great improvement of people's awareness of the environment and self-protection has made it very difficult for transmission lines to deal with policies, demolition and resettlement, and save corridors.

Traditional transmission towers generally use angle steel towers with wires arranged horizontally. Due to the control of the horizontal pole spacing of the wires, the corridors are wide. At present, there are some vertically arranged tension towers, which show that vertically arranged tension towers have great advantages in reducing the width of the tower corridor, but there are still some problems such as heavy tower weight, difficult node handling, and unreasonable cross-bearing force, etc. question.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

In order to solve the problems existing in the prior art, the present invention provides a 220kV same-tower double-circuit compact windproof and biased transmission tower. The jumper frame is made of composite materials, which can greatly compress the height of the line corridor and the tower, optimize the space occupied by the corridor, and reduce the wind deflection of the jumper.

(2) Technical solutions

In order to achieve the above-mentioned purpose, the main technical scheme adopted in the present invention includes:

Design a 220kV same-tower double-circuit compact windproof and biased transmission tower, including tower legs, tower body, tower head and ground wire support connected in sequence from bottom to top; the tower head includes multi-layer conductors vertically arranged on the tower body The cross-arm, the wire cross-arm composite material jumper brackets are respectively fixed on both sides of each layer of the wire cross-arm; the conductor cross-arm composite material jumper brackets are all connected with the six-phase wires through the insulator strings.

In the above solution, the wire cross-arm composite jumper support includes a support body fixed on the clad angle steel.

In the above solution, the inside of the stent body is filled with filler.

In the above scheme, the outer surface of the stent body is coated with a coating.

In the above solution, the bracket body is made of high-strength and high-modulus glass fiber reinforced composite material.

In the above solution, the cross-section of the stent body is a special-shaped tubular shape.

In the above solution, the coating is made of alicyclic epoxy resin and its composition.

In the above solution, the filler is lightweight foam.

In the above solution, the multi-layer wire cross-arm is a three-layer wire cross-arm arranged up and down, and from top to bottom, there are an upper wire cross-arm, a middle wire cross-arm and a lower wire cross-arm, and the upper wire cross-arm is , The middle conductor cross-arm and the lower conductor cross-arm are respectively fixed with an upper conductor cross-arm composite material jumper bracket, a middle conductor cross-arm composite material jumper bracket and a lower conductor cross-arm composite material jumper bracket; the upper conductor cross-arm composite material jumper bracket; The cross-arm composite jumper bracket, the middle-conductor cross-arm composite jumper bracket, and the lower-conduct cross-arm composite jumper bracket are all connected to the six-phase conductors through an "I"-shaped insulator string.

In the above solution, the upper wire cross-arm composite jumper support, the middle wire cross-arm composite jumper support and the lower wire cross-arm composite jumper support all include a support body fixed on the wrap angle steel.

The invention combines the advantages of high-strength and high-modulus glass fiber reinforced composite materials and tensile towers, through reasonable electrical planning and structural calculation, and utilizes the insulation properties of the composite materials to appropriately reduce the length of the insulator string and reduce the wind deflection of the insulator string, so as to effectively It can effectively solve the problem that the transmission line occupies too many corridors and is too wide; due to the overall compression of the length of the jumper cross-arm and the jumper string, the problem of the jumper's wind deflection and flashover is solved.

(3) Beneficial effects

The beneficial effects of the present invention are: the transmission tower of the present invention has the following advantages: 1) light weight, large strength-to-weight ratio, and saving a lot of steel; 2) the wire cross arms are arranged vertically, and the jumper bracket adopts composite materials with excellent insulating properties, so that the The length of the insulator string and the air spacing between the conductor and the transmission tower are reduced, thereby reducing the phase conductor spacing, compressing the width of the corridor, and reducing lightning flashovers, ice flashes, galloping and other accidents.

Description of drawings

Figure 1 is a schematic diagram of the structure of a 220kV double-circuit compact wind-proof partial transmission tower on the same tower;

FIG. 2 is a schematic cross-sectional view of a composite jumper support.

In the picture: tower leg 1, tower body 2, tower head 3, ground wire support 4, upper wire cross arm 3.1, middle wire cross arm 3.2, lower wire cross arm 3.3, upper wire cross arm composite jumper bracket 3.4, middle wire cross arm 3.3 Conductor cross arm composite jumper bracket 3.5, lower conductor cross arm composite jumper bracket 3.6, insulator string 5, clad angle steel 3.7, bracket body 3.8, filler 3.9, coating 3.10.

Detailed ways

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

During the course of the invention the inventors noticed:

With the introduction of composite materials, composite cross-arms began to be used to compress the width of corridors. Composite materials have the advantages of light weight, high strength, corrosion resistance, convenient processing and molding, and good electrical insulation. After the composite material is used, a large amount of steel can be saved, and by using its insulating properties, it is not only easy to solve the wind deflection and pollution flashover accidents of the line, improve the safe operation level of the line, but also reduce the size of the tower head, reduce the width of the corridor, and save land resources. , reduce demolition costs and reduce project investment costs. In addition, due to the characteristics of light weight and easy processing and forming of composite materials, the transportation and assembly costs of the tower can be greatly reduced. At present, composite materials have been tested in projects such as the 220kV Lianyungang Maoqiang Line in Jiangsu, the 750kV Hami Section of the Second Northwest Passage, and the ±800kV UHV DC Lingshao Line. However, these several engineering trial studies are only limited to linear towers with relatively small loads, and the design of tension towers is not carried out, mainly due to the limitation of the strength of composite materials, generally unable to withstand the wire tension under the tension towers.

Conventional 220kV double-circuit tension towers generally use vertical drum towers, the tension hanging point is generally set at the end of the cross arm, and the jumper frame is generally arranged outside the hanging point outside the corner. The length of the overall cross arm is controlled by the jumper string gap, and the actual distance between phases in the gear far exceeds the specified value. Taking the flat-ground double-circuit tension tower as an example, the minimum interphase distance is 9.8m for the upper phase, and the usable span exceeds 1000m. Therefore, the distance between the tension towers can be compressed in most areas.

As shown in Figure 1, the present invention provides a 220kV same-tower double-circuit compact windproof and biased transmission tower, comprising a tower leg 1, a tower body 2, a tower head 3 and a ground wire support 4 sequentially connected from bottom to top; the tower head 3 It is composed of three layers of conductor cross-arms arranged vertically and vertically on the tower body 2. From top to bottom, there are upper conductor cross-arm 3.1, middle conductor cross-arm 3.2, lower conductor cross-arm 3.3, and upper conductor cross-arm 3.1. , The middle wire cross arm 3.2 and the lower wire cross arm 3.3 are respectively fixed with the upper wire cross arm composite material jumper bracket 3.4, the middle wire cross arm composite material jumper bracket 3.5 and the lower wire cross arm composite material jumper bracket 3.6. The upper conductor cross-arm composite jumper bracket 3.4, the middle conductor cross-arm composite jumper bracket 3.5 and the lower conductor cross-arm composite jumper bracket 3.6 are connected to the six-phase conductor through the insulator string 5, and the insulator string 5 is I-shaped. .

As shown in Figure 2, the upper conductor cross-arm composite jumper bracket 3.4, the middle conductor cross-arm composite jumper bracket 3.5 and the lower conductor cross-arm composite jumper bracket 3.6 all include a bracket body 3.8 fixed on the clad angle steel 3.7 , the inside of the stent body 3.8 is filled with filler 3.9, and the outer surface of the stent body 3.8 is coated with a coating 3.10. Wherein, the bracket body 3.8 is made of high-strength and high-modulus glass fiber reinforced composite material; the coating 3.10 is a fiber protection coating, preferably, alicyclic epoxy resin and its composition are selected as the coating; the filler 3.9 is lightweight foam. The insulation performance of the composite material is better. Under the condition of ensuring the same insulation level, the length of the insulator string and the air spacing between the conductor and the transmission tower can be reduced, thereby reducing the three-phase conductor spacing and compressing the width of the corridor; Under the premise, the height of the tower head can be effectively reduced, thereby improving the lightning resistance level; the reduction in the length of the insulator string further shortens the length of the wire cross-arm, thereby compressing the width of the line corridor. Compared with the conventional double-circuit tensile tower, the invention has the advantages that the maximum phase conductor spacing is compressed by 5.5m, the layer height is compressed by 2m, the jumper to the ground is increased by about 1m, and the overall tower head compression is optimized.

The cross-section of the bracket body 3.8 is in the shape of a special-shaped tube. Compared with the flange-shaped cross-section of the existing composite material, the weight is greatly reduced.

The transmission tower of the present invention has the following advantages:

1) Light weight, large strength-to-weight ratio, saving a lot of steel;

2) Good insulation performance, effectively reducing the insulation design level, reducing the spacing of phase conductors, reducing the width of corridors, and can significantly reduce lightning flashovers, ice flashes, dancing and other accidents;

3) chemical corrosion resistance, wear resistance, waterproof, fire resistance and flame retardant;

4) Easy to process and form, easy to install, transport and assemble.

The accompanying drawings describe the embodiments of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only schematic, not restrictive, and those of ordinary skill in the art are familiar with the present invention. Under the inspiration of the present invention, many forms can be made without departing from the scope of protection of the present invention and the claims, which all belong to the protection of the present invention.

Claims (10)

1. A220 kV one-tower double-loop compact type wind deviation prevention power transmission tower is characterized by comprising tower legs (1), a tower body (2), a tower head (3) and a ground wire support (4) which are sequentially connected from bottom to top; the tower head (3) comprises a plurality of layers of wire cross arms vertically arranged on the tower body (2), and wire cross arm composite material jumper supports are respectively fixed on two sides of each layer of wire cross arm; the wire cross arm composite material jumper wire support is connected with six-phase wires through insulator strings (5).

2. The 220kV common-tower double-circuit compact wind deviation prevention power transmission tower according to claim 1, wherein the wire cross arm composite material jumper support comprises a support body (3.8) fixed on a covered angle steel (3.7).

3. The 220kV double-circuit same-tower and compact type windage yaw prevention transmission tower according to claim 2, wherein the bracket body (3.8) is internally filled with a filler (3.9).

4. The 220kV double-circuit same-tower and compact type windage yaw prevention transmission tower according to claim 2, wherein the outer surface of the bracket body (3.8) is coated with a coating (3.10).

5. A220 kV double-circuit compact windage yaw prevention power transmission tower according to any one of claims 2 to 4, characterized in that the bracket body (3.8) is made of high-strength high-modulus glass fiber reinforced composite.

6. A220 kV double-circuit compact windage yaw prevention power transmission tower as claimed in any one of claims 2 to 4, wherein the cross-section of the bracket body (3.8) is in the shape of a profiled tube.

7. The 220kV double-circuit same-tower compact type windage yaw prevention power transmission tower according to claim 4, wherein the coating (3.10) is made of alicyclic epoxy resin and a composition thereof.

8. The 220kV double-circuit same-tower compact type windage yaw prevention power transmission tower according to claim 4, wherein the filler (3.9) is light foam.

9. The 220kV common-tower double-circuit compact type wind deviation prevention power transmission tower according to claim 1, wherein the multilayer wire cross arm is a three-layer wire cross arm which is arranged up and down, an upper wire cross arm (3.1), a middle wire cross arm (3.2) and a lower wire cross arm (3.3) are sequentially arranged from top to bottom, and an upper wire cross arm composite material jumper support (3.4), a middle wire cross arm composite material jumper support (3.5) and a lower wire cross arm composite material jumper support (3.6) are respectively fixed on two sides of the upper wire cross arm (3.1), the middle wire cross arm (3.2) and the lower wire cross arm (3.3); the upper conductor cross arm composite material jumper support (3.4), the middle conductor cross arm composite material jumper support (3.5) and the lower conductor cross arm composite material jumper support (3.6) are connected with six-phase conductors through I-shaped insulator strings (5).

10. The 220kV common-tower double-circuit compact windage yaw prevention transmission tower according to claim 9, wherein the upper wire cross arm composite jumper support (3.4), the middle wire cross arm composite jumper support (3.5) and the lower wire cross arm composite jumper support (3.6) each comprise a support body (3.8) fixed on a wrap angle steel (3.7).

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