Compact single-circuit I-type integrated composite insulation tower

Abstract

The invention relates to a compact single-circuit I-type integrated composite insulation tower which comprises a tower head part, a tower body part and a tower base part. The tower head part comprises a grounding leading-down steel pipe, a glass fiber composite material, a wire steel ring and a wire clamp; the grounding leading-down steel pipe is wrapped by a glass fiber composite material, a plurality of wire steel rings are arranged on the surface of the glass fiber composite material, umbrella skirts are formed among the wire steel rings, and wire clamps are fixed on the wire steel rings. The invention has the beneficial effects that the insulation distance between phases is compressed by utilizing the insulation capability of the tower body, and the spaces on the two horizontal sides of the tower are saved; and the wire is directly fixed on the tower head of the tower, and the tower provides mechanical fixation and support, so that the wind deflection angle of the wire is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line tower structures, and more precisely, it relates to a compact single-circuit I-shaped integrated composite insulation tower. Background Art

[0002] With the development of China's power industry, in accordance with the requirements of urban power planning specifications, the number of urban power transmission lines is increasing nowadays. Overhead transmission lines are generally supported by towers to lay multiple conductor lines side by side in the air, which is easy for maintenance and construction. However, as the urban land area increases, the corridor resources are becoming increasingly scarce. With the improvement of people's environmental protection awareness, the problems of the impact of line electromagnetic fields on the environment and the contradiction between transmission corridors and urban land use are becoming more and more obvious. At the same time, the relatively large corridor width of traditional steel lattice towers means a higher lightning strike probability, and the relatively high tower height means a higher tower top overvoltage during lightning strikes. Usually, the lightning protection angle of lattice towers with non-super high voltage levels is relatively large, resulting in a relatively high rate of shielding failure accidents. From the perspective of tower operation, traditional towers use suspension insulators to support conductors. Conductors are prone to wind deviation tripping accidents in strong wind environments, and the tower body and cross arms of the tower are lattice structures, making it easy for birds to build nests and prone to hazards such as bird droppings flashover. In addition, traditional lattice towers require a large amount of energy consumption, manpower and material resources in production, manufacturing and installation, which does not conform to the concept of the green and low-carbon transformation of power equipment. Summary of the Invention

[0003] The purpose of the present invention is to propose a compact single-circuit "I"-shaped integrated composite insulation tower in view of the deficiencies of the prior art.

[0004] In the first aspect, a compact single-circuit I-shaped integrated composite insulation tower is provided, including: a tower head part, a tower body part, and a tower base part. The tower head part is connected to the tower base part through the tower body part; the tower head part is used to support conductors and lightning conductors, and the tower body part is used to support the tower head part and provide a lightning current grounding path; the tower base part is buried deep into the soil to serve as the grounding electrode of the tower.

[0005] Among them, the tower head part includes a grounding downlead steel pipe, a glass fiber composite material, conductor steel rings, and conductor clamps; the grounding downlead steel pipe is coated with the glass fiber composite material, several conductor steel rings are arranged on the surface of the glass fiber composite material, umbrella skirts are formed between the conductor steel rings, and conductor clamps are fixed on the conductor steel rings.

[0006] Preferably, the tower also includes a grading ring; the grading ring is welded to the conductor steel rings, at the top and bottom of the tower head part.

[0007] Preferably, the grounding downlead steel pipe is a hollow steel pipe, and a lightning conductor installation point is provided at the top of the grounding downlead steel pipe.

[0008] Preferably, the wire steel ring is cylindrical and embedded in the tower head part. Three wire steel rings are arranged in sequence from top to bottom and sleeved on the tower head part. Sufficient insulation distances are maintained between the wire steel rings, between the wire steel ring and the tower top, and between the wire steel ring and the bottom end of the tower head.

[0009] Preferably, the wire clamp is welded to the wire ring and is used to fix the phase wire and the fittings of the phase-split conductor; the installation positions of the wire clamps on adjacent poles and towers are different, and the wire fixing shows a plain weave layout.

[0010] Preferably, the umbrella skirt is made of vulcanized silicone rubber and is sleeved between the wire steel ring and the top end of the tower head part, between the wire steel rings, and between the wire steel ring and the bottom end of the tower head part.

[0011] Preferably, the tower body part is composed of a hollow steel pipe, and the tower body part has the same diameter as the tower head part already coated with glass fiber composite material; the steel plates at the top end of the tower body part and the bottom end of the tower head part are fixed by bolts.

[0012] Preferably, the tower base part is a metal cylinder, and the top end of the tower base part is fixed to the bottom end of the tower body part by bolts.

[0013] In a second aspect, there is provided a manufacturing method of the compact single-circuit I-type integrated composite insulation pole and tower as described in the first aspect, including:

[0014] Step 1: Select a hollow steel pipe as the grounding downlead steel pipe and weld it to the tower head base.

[0015] Step 2: Select an insulating resin to impregnate glass fiber to form a glass fiber composite material, and wrap the glass fiber composite material around the grounding downlead steel pipe through a reciprocating fiber winding process; the insulating resin includes epoxy resin, polyurethane, and phenolic resin.

[0016] Step 3: Sleeve several wire steel rings on the outside of the glass fiber composite material at a certain distance and reinforce them, and then install the wire clamps on the wire steel rings in a staggered manner.

[0017] Step 4: Sleeve the umbrella skirt made of vulcanized silicone rubber between the wire steel ring and the top end of the tower head part, and between the wire steel rings to form the tower head part.

[0018] Step 5: Select a hollow steel pipe to form the tower body part, and select a metal cylinder as the tower base part; bolt-connect the tower head part to the tower body part, and bolt-connect the tower base part to the tower body part.

[0019] The beneficial effects of the present invention are:

[0020] 1. Through the integrated design of the pole and tower, insulator, wire fittings, and grading ring, the present invention compresses the space of the tower head of the pole and tower.

[0021] 2. In the pole tower of the present invention, the center of the tower head is a steel pipe. The top of the steel pipe is connected to the lightning protection wire, and the bottom disc is connected to the metal tower body, which can provide a lightning current conduction path for the pole tower when the lightning protection wire or the tower top is struck by lightning.

[0022] 3. The steel pipe on the tower head of the present invention is coated with an insulating material, and a metal wire ring is sleeved on the insulating material. The insulating material plays the role of a traditional insulator to achieve insulation between the conductor and the ground potential. The metal ring replaces the conductor fitting and is sleeved on the tower head. The wire rings are vertically distributed, and umbrella skirts are sleeved between the wire rings to achieve insulation between phases. In fact, the insulation ability of the tower body is utilized to compress the insulation distance between phases, saving the space on both horizontal sides of the pole tower.

[0023] 4. The insulating pole tower in the present invention has no truss and lattice columns, so birds cannot build nests on the pole tower, thus avoiding corresponding flashover accidents. At the same time, the lightning protection wire and the phase conductor of the new pole tower are almost perpendicular, which means that the lightning protection angle of the pole tower is very low (almost zero), and the shielding failure accidents of the pole tower will be greatly reduced. The conductors of the new type of insulating pole tower are directly fixed on the tower head of the pole tower, and the pole tower itself provides mechanical fixation and support. Therefore, the wind deflection angle of the conductor will also be reduced. Moreover, the composite material pole tower uses less raw materials, and the energy consumption and carbon emissions required in the production and manufacturing process are far lower than those of traditional steel pole towers of the same voltage level. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the pole tower provided by the present invention;

[0025] Figure 2 is a schematic diagram of the tower head structure of the pole tower provided by the present invention;

[0026] Figure 3 is a sectional view of the tower head of the pole tower provided by the present invention;

[0027] Figure 4 is a schematic diagram of the tower body structure of the pole tower of the present invention;

[0028] Figure 5 is a schematic diagram of the tower base structure of the pole tower of the present invention;

[0029] Figure 6 is the single-circuit three-phase conductor routing method of the pole tower of the present invention;

[0030] Figure 7 is the design of the lightning protection wire when two circuits of the pole tower are routed side by side;

[0031] Description of reference numerals: 1, grading ring; 2, conductor clamp; 3, petticoat; 4, conductor steel ring; 5, grading ring welding part; 6, glass fiber composite material; 7, tower head base; 8, tower head bolt; 9, grounding downlead steel pipe; 10, lightning protection wire installation point; 11, tower top screw hole; 12, tower base; 13, tower steel pipe; 14, tower base bolt; 15, tower foundation top screw hole; 16, tower foundation steel pipe; 17, lightning protection wire; 18, lightning protection wire connecting wire. Detailed implementation manners

[0032] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0033] Embodiment 1:

[0034] As Figure 1 shown, the embodiment of the present application provides a compact single-circuit I-type integrated composite insulation tower, including: a tower head part A, a tower body part B, and a tower foundation part C. The tower head part is connected to the tower foundation part through the tower body part; the tower head does not use the suspension insulators and strain insulators of traditional transmission towers, but integrally forms the insulators with the tower head, enabling the tower head to simultaneously play the roles of conductor support and conductor phase insulation. The tower body part is used to support the tower head part and provide a lightning current grounding channel; the tower foundation part is buried deep into the soil as the grounding electrode of the tower. Multiple single-circuit "I"-type integrated composite material towers arranged at a certain safe distance can achieve double-circuit and multi-circuit power transmission.

[0035] Among them, the tower head part includes a grounding downlead steel pipe 9, a glass fiber composite material 6, a conductor steel ring 4, and a conductor clamp 2; the grounding downlead steel pipe 9 covers the glass fiber composite material 6, several conductor steel rings 4 are arranged on the surface of the glass fiber composite material 6, petticoats 3 are formed between the conductor steel rings 4, and a conductor clamp 2 is fixed on the conductor steel ring 4.

[0036] For the towers in long-term operation, the maximum electric field strength E inside the glass fiber composite material 6 shall not exceed 3 kV / mm. Therefore, the radius (r) of the grounding downlead steel pipe 9, the radius (R) of the pipe after covering the glass fiber composite material 6, and the operating phase voltage U need to meet the following conditions:

[0037]

[0038] The main reason for using a steel pipe for the grounding downlead is that the downlead mainly provides a conductive channel for lightning strike current. The frequency component f of the lightning current is high-frequency, and there is a skin effect during propagation in the conductor. The skin depth δ satisfies the following formula:

[0039]

[0040] Where μ is the magnetic permeability of the conductor (H / m), and σ is the electrical conductivity of the conductor (S / m). Therefore, from the perspective of cost and mechanical stability, the grounding downlead steel pipe 9 of the tower of the present invention, the tower body steel pipe 13, and the tower base steel pipe 16 all adopt hollow steel pipes.

[0041] The schematic diagram of the tower body is as Figure 4 shown. The screw hole 11 at the top of the tower body is connected to the tower head chassis 7 through the tower head bolt 8. The tower body base 12 and the screw hole 15 at the top of the tower base are fixed through the tower body base bolt 14. The length L of the tower base can be adjusted according to the soil conditions. The grounding resistance R of the tower base of the tower i satisfies the following formula.

[0042] R i =(ρ0 / 2πL)[ln(4L / r0)-1]

[0043] Where ρ0 is the soil resistivity and r0 is the radius of the tower base.

[0044] Embodiment 2:

[0045] Based on Embodiment 1, Embodiment 2 of the present application provides a more specific compact single-circuit I-type integrated composite insulation tower, including: a tower head part A, a tower body part B, and a tower base part C.

[0046] Among them, the tower head part includes a grounding downlead steel pipe 9, a glass fiber composite material 6, a conductor steel ring 4, and a conductor clamp 2; the grounding downlead steel pipe 9 covers the glass fiber composite material 6, and a plurality of conductor steel rings 4 are arranged on the surface of the glass fiber composite material 6. An umbrella skirt 3 is formed between the conductor steel rings 4, and a conductor clamp 2 is fixed on the conductor steel ring 4.

[0047] Exemplarily, the conductor steel ring 4 is in a cylindrical shape and is embedded in the tower head part of the tower. Three conductor steel rings 4 are arranged in sequence from top to bottom and sleeved on the tower head. Sufficient insulation distances are maintained between the conductor steel rings 4, between the conductor steel ring 4 and the tower top, and between the conductor steel ring 4 and the bottom end of the tower head.

[0048] In addition, as Figure 2 , 3 shown, for high-voltage transmission lines, the tower also includes a grading ring 1; the grading ring 1 is welded to the conductor steel ring 4, at the top and bottom of the tower head part. For example, each grading ring 1 is fixed on the conductor steel ring 4 through four grading ring welding parts 5.

[0049] The grounding downlead steel pipe 9 is a hollow steel pipe, and a lightning protection wire installation point 10 is provided at the top of the grounding downlead steel pipe 9.

[0050] The wire clamp 2 is welded to the wire loop and set according to the number of split wires of the wire, which plays a role in fixing the phase wire and the fittings of the phase-split wire. The wire clamps are installed in a staggered manner, that is, the installation positions of the wire clamps on adjacent poles are different. For example, the wire clamp 2 of the pole is misaligned and installed on three wire steel rings 4. When multiple poles of a single-circuit line are installed, the positions of the poles are staggered by 180° in pairs, so that the three-phase wire routing can present a winding-through manner similar to "plain weave" routing, as Figure 6 shown. This phase wire routing method can enable the wires to intertwine and connect the poles, enhancing the wind resistance of the poles and also reducing the wind deflection angle of the wires.

[0051] The umbrella skirt 3 is made of vulcanized silicone rubber and is sleeved between the wire steel ring 4 and the top of the tower head part, between the wire steel rings 4, between the wire steel ring 4 and the bottom end of the tower head part, and between the wire steel ring 4 and the bottom end of the tower head part.

[0052] The tower body part is composed of a hollow steel pipe, and the tower body part has the same diameter as the tower head part already covered with fiberglass composite material 6; the steel plates at the top end of the tower body part and the bottom end of the tower head part are fixed by bolts.

[0053] The tower base part is a metal cylinder, and the top end of the tower base part is fixed to the bottom end of the tower body part by bolts.

[0054] If the pole is used for a double-circuit or multi-circuit load-bearing transmission line, as Figure 7 shown. First, the lightning protection wire is installed at the lightning protection wire installation point 10 of the tower head, and two or more rows are arranged side by side. A connecting wire for the lightning protection wire is installed between the tower heads of the side-by-side poles to reduce the wave impedance of the grounding system of the poles. The grounding system of a single pole includes two parts: the grounding lead steel pipe 9 and the tower body steel pipe 13, and the corresponding wave impedance Z T (self-impedance) satisfies the following formula:

[0055]

[0056] where r is the radius of the steel pipe and h is the height of the steel pipe.

[0057] If the lightning protection wires at the tops of two poles 17 are connected by a metal wire 18, the total wave impedance Z of the two pole tower heads can be expressed as the average value of the self-impedance Z T of a single pole tower head and the mutual impedance Z m of the two poles. The formula is as follows:

[0058]

[0059]

[0060] where D is the distance between the two poles.

[0061] This lightning protection wire design can reduce the tower top potential at the moment when the tower is struck by lightning, reduce the back-striking rate of the tower, and improve the lightning protection characteristics of the tower.

[0062] It should be noted that the parts that are the same as or similar to those in Embodiment 1 in this embodiment can be referred to each other and will not be described in detail in this application.

[0063] Embodiment 3:

[0064] Based on Embodiments 1 and 2, Embodiment 3 of this application provides a manufacturing method for a compact single-circuit I-type integrated composite insulation tower, including:

[0065] Step 1: Select a hollow steel pipe as the grounding downlead steel pipe 9 and weld it to the tower head base 7.

[0066] Step 2: Select glass fiber impregnated with insulating resin to form a glass fiber composite material 6, and wrap the glass fiber composite material 6 around the grounding downlead steel pipe 9 through a reciprocating fiber winding process; the insulating resin includes epoxy resin, polyurethane, and phenolic resin.

[0067] Step 3: Sleeve a number of conductor steel rings 4 on the outer side of the glass fiber composite material 6 at a certain distance and reinforce them, and then misalign and install the conductor clamps 2 on the conductor steel rings 4.

[0068] In Step 3, for high-voltage transmission lines, grading rings 1 are installed on the upper and lower sides of each conductor steel ring and at the top of the tower head. Each grading ring is fixed on the conductor steel ring 4 through four welding parts 5.

[0069] Step 4: Sheath the petticoats 3 made of vulcanized silicone rubber between the conductor steel rings 4 and the top of the tower head part and between the conductor steel rings 4 to form the tower head part.

[0070] Step 5: Select a hollow steel pipe to form the tower body part, and select a metal cylinder as the tower base part; bolt the tower head part to the tower body part, and bolt the tower base part to the tower body part.

[0071] Specifically, the system provided in this embodiment is the manufacturing method corresponding to the devices provided in Embodiments 1 and 2. Therefore, the parts that are the same as or similar to those in Embodiments 1 and 2 in this embodiment can be referred to each other and will not be described in detail in this application.

Claims

1. A compact single-circuit I-shaped integrated composite insulation tower, characterized in that, Comprising: The tower head part, the tower body part and the tower base part, wherein the tower head part is connected to the tower base part through the tower body part; The tower head part is used for supporting conductors and lightning conductors, and the tower body part is used for supporting the tower head part and providing a grounding path for lightning current; the tower base part is deeply buried in the soil as the grounding electrode of the pole tower; Among them, the tower head part includes a grounding downlead steel pipe (9), a glass fiber composite material (6), a conductor steel ring (4) and a conductor clamp (2); the grounding downlead steel pipe (9) covers the glass fiber composite material (6), and a plurality of conductor steel rings (4) are arranged on the surface of the glass fiber composite material (6), umbrella skirts (3) are formed between the conductor steel rings (4), and conductor clamps (2) are fixed on the conductor steel rings (4).

2. The compact single-circuit I-type integrated composite insulation pole tower according to claim 1, wherein The pole tower further includes a grading ring (1); the grading ring (1) is welded to the conductor steel ring (4) at the top and bottom ends of the tower head part.

3. The compact single-circuit I-type integrated composite insulation tower according to claim 1, wherein The grounding downlead steel pipe (9) is a hollow steel pipe, and a lightning conductor installation point (10) is arranged at the top end of the grounding downlead steel pipe (9).

4. The compact single-circuit I-type integrated composite insulation tower according to claim 1, wherein The conductor steel ring (4) is in a cylindrical shape and is embedded in the tower head part. Three conductor steel rings (4) are arranged in sequence from top to bottom and sleeved on the tower head part. Sufficient insulation distances are maintained between the conductor steel rings (4), between the conductor steel ring (4) and the tower top, and between the conductor steel ring (4) and the bottom end of the tower head.

5. The compact single-circuit I-type integrated composite insulation tower according to claim 1, wherein, The conductor clamp (2) is welded to the conductor steel ring (4) and is used for fixing phase conductors and phase-split conductor fittings; the installation positions of the conductor clamps (2) of adjacent pole towers are different, and the conductors are fixed in a plain weave pattern.

6. The compact single-circuit I-type integrated composite insulation tower according to claim 1, characterized in that, The umbrella skirt (3) is made of vulcanized silicone rubber and is sleeved between the conductor steel ring (4) and the top end of the tower head part, between the conductor steel rings (4), and between the conductor steel ring (4) and the bottom end of the tower head part.

7. The compact single-circuit I-type integrated composite insulation tower according to claim 1, characterized in that, The tower body part is composed of hollow steel pipes, and the tower body part has the same diameter as the tower head part already covered with the glass fiber composite material (6); the steel plates at the top end of the tower body part and the bottom end of the tower head part are fixed by bolts.

8. The compact single-circuit I-type integrated composite insulation tower according to claim 1, characterized in that, The tower base part is a metal cylinder, and the top end of the tower base part is fixed to the bottom end of the tower body part by bolts.

9. A manufacturing method of the compact single-circuit I-type integrated composite insulation tower as described in claim 1, characterized in that, Comprising: Step 1: Select a hollow steel pipe as the grounding downlead steel pipe (9) and weld it to the tower head base (7); Step 2: Select an insulating resin to impregnate glass fibers to form a glass fiber composite material (6), and wrap the glass fiber composite material (6) around the grounding downlead steel pipe (9) through a reciprocating fiber winding process; the insulating resin includes epoxy resin, polyurethane and phenolic resin; Step 3: Sleeve a plurality of conductor steel rings (4) on the outer side of the glass fiber composite material (6) at a certain distance and reinforce them, and then install the conductor clamps (2) on the conductor steel rings (4) in a staggered manner; Step 4: Sleeve the umbrella skirt (3) made of vulcanized silicone rubber between the conductor steel ring (4) and the top end of the tower head part, and between the conductor steel rings (4) to form the tower head part; Step 5: Select hollow steel pipes to form the tower body part, and select a metal cylinder as the tower base part; bolt-connect the tower head part to the tower body part, and bolt-connect the tower base part to the tower body part.

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