CN201635465U - A high-voltage transmission line terminal tower - Google Patents

Abstract

The utility model relates to a terminal high tower of an extra-high voltage transmission line, the terminal high tower includes a wire cross arm, a ground wire cross arm, and a tower body; wherein, the ground wire cross arm is arranged on the top of the tower head of the tower body The wire cross arm is located at the lower part of the tower head of the tower body; the middle wire suspension point is set between the ground wire cross arm and the wire cross arm; the main material of the terminal high tower is high-strength steel. By adopting the embodiment of the utility model, the requirements of the UHV transmission line can be met.

Description

A high-voltage transmission line terminal tower

technical field

The utility model relates to the field of high-voltage iron towers, in particular to an ultra-high voltage transmission line terminal high tower.

Background technique

Since nearly 2/3 of my country's exploitable hydropower resources are in the west, and 2/3 of coal resources are in Shanxi, Shaanxi and Inner Mongolia; however, 2/3 of my country's electricity load is distributed in the eastern coastal areas and economic areas east of the Beijing-Guangzhou Railway. developed areas. In this way, it is necessary to transmit the power generated by the energy base to the central and eastern regions where the power demand is large.

In order to reduce transmission loss and improve transmission quality, my country is currently developing UHV transmission technology.

UHV AC transmission refers to AC transmission projects and related technologies with a voltage level of 1000kV and above. UHV transmission technology has the characteristics of long distance, large capacity, low loss and economy. Although UHV transmission technology has the above advantages, due to the high voltage level of UHV, there are high requirements for transmission line towers.

High-voltage transmission line towers are used to support transmission wires and ground wires in overhead power transmission lines, and are also called towers for overhead power transmission lines. The terminal tower is the final point where the transmission line enters the substation, with the line side on one side and the substation (switchyard) side on the other.

In the existing power transmission line structure, the general ultra-high voltage terminal iron tower adopts a single-angle steel structure, which has the advantage of simple structure. For iron towers with greater force, double-angle steel methods are used, such as solid-web columns.

Since 1000kV UHV transmission lines need to use large cross-section conductors, the terminal towers used for UHV are required to withstand relatively large external forces, and the shape of the terminal towers is also required to be large. However, the ability of existing terminal towers to withstand external forces is still very limited, which is not suitable for the requirements of UHV transmission lines.

Therefore, designing a terminal tower applied to UHV transmission lines is a technical problem urgently needed to be solved by those skilled in the art.

Utility model content

The technical problem to be solved by the utility model is to provide a high terminal tower for UHV transmission lines, which can meet the requirements of UHV transmission lines.

In order to achieve the above purpose, the utility model provides a terminal high tower of UHV transmission line, the terminal high tower includes a wire cross arm, a ground wire cross arm, and a tower body; wherein,

The ground wire cross arm is arranged on the top of the tower head of the tower body; the wire cross arm is located at the lower part of the tower head of the tower body; between the ground wire cross arm and the wire cross arm, during installation wire suspension points;

The main material of the terminal tower is high-strength steel.

Preferably, four ground wire hanging points are respectively set on the left and right branches of the ground wire cross arm.

Preferably, the hanging point of the medium wire and the hanging point of the ground wire of the terminal tower adopts GD type trunnion hanging plate fittings.

Preferably, the three-phase wires of the terminal tower adopt aluminum tube type rigid hard jumpers.

Preferably, the main materials of the tower center and tower legs of the terminal high tower body include: single-angle steel, double-angle steel, and four-angle steel.

Preferably, the joints of the tower center and the tower legs adopt the joint treatment method of transition from single-angle steel to double-angle steel, and transition from double-angle steel to four-angle steel.

Preferably, the transition from the double-angle steel to the four-angle steel is specifically: two angle steels in the four-angle steel that are relatively indirectly stressed are extended to the upper section by a certain length, and connected with the upper double-angle steel by bolts.

Preferably, the main material of the wire cross arm and the ground wire cross arm of the terminal tower adopts T-shaped combined double angle steel.

Compared with the prior art, the utility model has the following advantages:

The utility model provides a terminal high tower of an UHV transmission line, the terminal high tower includes a wire cross arm, a ground wire cross arm, and a tower body; wherein, the ground wire cross arm is arranged on the top of the tower head of the tower body , used to hang the ground wire; the wire cross arm is located at the lower part of the tower head of the tower body, and is used to hang the phase transmission wires on both sides; between the ground wire cross arm and the wire cross arm, the middle wire is suspended point, used to suspend the medium-phase transmission conductor.

In order to meet the requirements of UHV transmission lines, compared with the prior art, the terminal tower of the utility model has an increased tower height, a larger tower head size, and a larger corridor area occupied by the line. In order to ensure the safety of the power transmission line and increase the external force bearing capacity and rigidity of the terminal tower, in the material selection design of the terminal tower described in the utility model, the main material is Q420 high-strength steel combined with Q345, Q235 and other ordinary steel. The design not only ensures the safety of the terminal tower, but also considers the economy and saves steel.

Description of drawings

Fig. 1 is the monoline diagram of the high tower of the UHV transmission line terminal of the present utility model;

Fig. 2 is a connection structure diagram of four-angle steel and double-angle steel in the high terminal tower of the utility model.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and understandable, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The terminal high tower described in the utility model is a terminal tower type adopted by an UHV 1000kV AC transmission line. The high terminal tower is the iron tower with the largest stress on the whole line in the entire UHV power transmission project.

The utility model provides a terminal high tower of an UHV transmission line, the terminal high tower includes a wire cross arm, a ground wire cross arm, and a tower body; wherein, the ground wire cross arm is arranged on the top of the tower head of the tower body , used to hang the ground wire; the wire cross arm is located at the lower part of the tower head of the tower body, and is used to hang the phase transmission wires on both sides; between the ground wire cross arm and the wire cross arm, the middle wire is suspended point, used to suspend the medium-phase transmission conductor.

In order to meet the requirements of UHV transmission lines, compared with the prior art, the terminal tower of the utility model has an increased tower height, a larger tower head size, and a larger corridor area occupied by the line. In order to ensure the safety of the power transmission line and increase the external force bearing capacity and rigidity of the terminal tower, in the material selection design of the terminal tower described in the utility model, the main material is Q420 high-strength steel combined with Q345, Q235 and other ordinary steel. The design not only ensures the safety of the terminal tower, but also considers the economy and saves steel.

Referring to FIG. 1 , it is a single-line diagram of the high tower of the UHV transmission line terminal of the present invention.

The high terminal tower includes: a wire cross arm 10 , a ground wire cross arm 20 , and a tower body 30 .

Setting: the upper part of the tower body 30 is the tower head, the middle part is the tower middle, and the bottom is the tower legs.

The ground cross arm 20 is arranged at the top of the tower head of the tower body 30 . The ground cross arm 20 includes two branches, which are respectively located on the left and right sides of the top of the tower head, extending horizontally to the left and right sides of the tower head and maintaining left and right symmetry.

The ground wire cross arm 20 is used to hang the ground wire and protect the three-phase transmission line.

The terminal high tower described in the utility model is used for the line entry and exit section of a 1000kV UHV substation (switch station). In order to meet the lightning protection requirements of UHV substation (switching station) equipment, four ground wire hanging points are respectively set on the branches on the left and right sides of the ground wire cross arm 20 of the terminal high tower. Thus, the terminal tower can be hung with three ground wires including the neutral ground wire, which meets the lightning protection requirements of the protective neutral wire and effectively reduces the probability of lightning strikes.

The conductor cross arm 10 is located at the lower part of the tower head of the tower body 30 . The conductor cross arm 10 includes two branches, which are respectively located on the left and right sides of the lower part of the tower head, extending horizontally to the left and right sides of the tower head and maintaining left and right symmetry.

The wire cross arm 10 is used to suspend the phase transmission wires on both sides.

Between the ground wire cross arm 20 and the conductor cross arm 10 , at the middle of the tower head, a medium conductor suspension point 40 is provided for suspending the medium phase transmission conductor.

As shown in FIG. 1 , the medium-phase transmission conductor 50a of the high terminal tower of the present invention is suspended on the suspension point 40 of the medium conductor through the tension insulator string 60a. The phase transmission conductors 50b and 50c on both sides are suspended on the left and right branches of the conductor cross arm 10 through the tension insulator strings 60b and 60c respectively.

In the absence of wind and other external forces, the centers of the three-phase transmission conductors (shown in circles in Figure 1) of the UHV transmission line terminal towers described in the utility model are arranged in a triangle and divided into upper and lower layers in the air.

Since the electrical clearance distance of the 1000kV UHV transmission line is relatively large, it is necessary to use a large cross-section eight-split conductor, resulting in a relatively large load-bearing capacity of the tower in the UHV line. At this time, compared with the existing conventional 500kV line terminal tower, the tower height of the terminal high tower for the UHV transmission line increases, the size of the tower head becomes larger, and the corridor area occupied by the line is also relatively large. In order to reasonably control the size of the tower head of the terminal tower and optimize the structure of the tower, the three-phase conductors of the terminal tower adopt aluminum tube type rigid hard jumpers, which can effectively reduce the tower head size of the terminal tower and reduce the engineering cost. cost.

Preferably, the suspension points of the medium wire and the ground wire of the terminal tower adopt GD type trunnion hanging plate fittings with superior mechanical performance.

Since the terminal tower is the most stressed iron tower in the entire UHV transmission project, in order to meet the force requirements of the UHV terminal tower, the outer dimension of the UHV terminal tower is larger than that of ordinary UHV terminal towers. The distance between the two ground wires of the high terminal tower in the utility model is 35.5m, and the distance between the phase conductors on both sides is 31.5m. The overall height of the terminal tower is 87.3m, which is 3 times the height of the ordinary ultra-high voltage terminal tower. ~4 times.

Simultaneously, in order to reduce the tower weight, the tower legs of the terminal high tower described in the utility model are up to 15m, which saves about 9 tons of steel compared with the general short-leg tower. The main material of the terminal high tower is calculated according to the external load conditions, and the maximum internal force can reach the design value of more than 600 tons.

According to the common sense of power transmission engineering, when the external size of the terminal tower is increased, the force on the ground wire crossarm and conductor crossarm of the terminal tower will inevitably increase, and its safety will decrease. In order to ensure the safety of the transmission line, the high-strength steel of the terminal tower in the utility model is combined with Q345, Q235 and other ordinary steels in the material selection design. Through the optimized design, the safety of the terminal tower is guaranteed, and the economy is also considered. , saving steel.

The high terminal tower of the utility model adopts Q420 high-strength steel in large quantities, and adopts multiple materials such as Q420 high-strength steel, Q345 and Q235 ordinary steel for the rods with different stress strengths. The main material specifications of the terminal tower are all made of Q420 high-strength steel from L100X8 and above, as shown in Figure 1, and the main materials marked with bold black lines are all made of Q420 high-strength steel.

At the same time, the terminal high tower described in the utility model adopts optimal measurement for the calculation length of each force-bearing member, so that the length and force meet the high-strength requirements, ensure the overall and local stability of the terminal tower, and also meet the rigidity requirements. And other aspects of the requirements, to achieve economic and technical rationality.

The high terminal tower of the utility model adopts the node processing mode of the transition from single angle steel to double angle steel and the transition from double angle steel to four angle steel in the main material of the tower center and tower legs. Referring to Fig. 2 specifically, it is a connection structure diagram of four-angle steel and double-angle steel in the high tower of the terminal described in the utility model, and the relatively non-directly stressed two-angle steel in the four-angle steel is extended to the upper section by a certain length, and the upper double-angle steel is passed through bolts connected. Adopting this structure can effectively strengthen the force bearing capacity of the nodes and ensure the strength of the node transition and other requirements.

In terms of specific design, the terminal high tower adopts T-shaped combined double angle steel on the main material of the conductor cross arm 10 and the ground wire cross arm 20 . Compared with ordinary single-angle steel, double-angle steel can not only withstand greater external force but also increase the rigidity of the terminal tower, effectively reducing the deformation and displacement of the iron tower. The main material of the terminal high tower adopts back-to-back four-angle steel composite cross-section tower sections, and the middle is connected with a filler plate.

In previous large-span tower projects, the main material generally adopts a square steel scheme as a lattice structure, which has a complex structure and relatively high engineering cost. The terminal high tower of the utility model adopts high-strength material four-angle steel back-to-back combination as the main material, which has clear force and simple structure. Compared with the lattice structure scheme of the prior art, the steel material can be saved by about 5% in structure.

The application of various combinations of angle steels to the same iron tower is the biggest difference between the high terminal tower of the utility model and the existing terminal tower. This kind of structure has a reasonable structure, and its structural and mechanical properties are matched and unified, which not only greatly enhances the rigidity of the entire iron tower, but also saves costs.

The above is a detailed introduction of a UHV transmission line terminal tower provided by the utility model. In this paper, specific examples are used to illustrate the principle and implementation of the utility model. The description of the above embodiments is only for helping understanding The method of the present utility model and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be understood as a limitation of the present utility model.

Claims (8)

1. A terminal high tower of an ultra-high voltage transmission line is characterized in that the terminal high tower comprises a wire cross arm, a ground wire cross arm and a tower body; wherein,

the ground wire cross arm is arranged at the top of the tower head of the tower body; the wire cross arm is positioned at the lower part of the tower head of the tower body; a middle lead suspension point is arranged between the ground wire cross arm and the lead cross arm;

and the main material of the terminal high tower is high-strength steel.

2. The terminal high tower of the extra-high voltage transmission line according to claim 1, wherein four ground wire hanging points are respectively arranged on the branches at the left side and the right side of the ground wire cross arm.

3. The terminal high tower of the extra-high voltage transmission line according to claim 2, wherein a GD-type trunnion hanging plate hardware fitting is adopted for a middle lead hanging point and a ground wire hanging point of the terminal high tower.

4. The ultra-high voltage transmission line terminal high tower of claim 1, wherein the three-phase conductor of the terminal high tower is an aluminum tube type rigid hard jumper.

5. The ultra-high voltage transmission line terminal high tower of claim 1, wherein the tower body and the tower leg main material of the terminal high tower comprise: single angle steel, double angle steel, and four angle steel.

6. The ultra-high voltage transmission line terminal high tower of claim 5, wherein the nodes of the tower and the tower legs adopt a node processing mode of transition from single angle steel to double angle steel and transition from double angle steel to four angle steel.

7. The ultra-high voltage transmission line terminal high tower of claim 6, wherein the transition from the double angle steel to the four-angle steel is specifically: two angle steels which are not directly stressed relatively in the four angle steels are extended to the upper section according to a certain length and are connected with the upper double angle steels through bolts.

8. The ultra-high voltage transmission line terminal high tower of claim 1, wherein main materials of a lead cross arm and a ground wire cross arm of the terminal high tower are T-shaped combined double angle steel.

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