CN204552246U - ± 500kV common-tower double-return road straight-line angle tower - Google Patents

Abstract

The utility model relates to one ± 500kV common-tower double-return road straight-line angle tower, comprise the tower body of bottom belt tower leg, described tower body head is provided with the upper cross-arm of upper and lower two-layer horizontal arrangement and lower cross-arm, two ends, left and right, described upper cross-arm top are provided with earth wire support, it is characterized in that: described upper cross-arm is hung with two the upper strata L-type insulator strings in left and right, described upper cross-arm left end is provided with cranking arm of bending downwards, described lower cross-arm is also hung with left and right Liang Ge lower floor L-type insulator string, described lower cross-arm left end is provided with cranking arm of bending downwards.Meet transmission of electricity demand and reduce the investment of whole engineering, having saved cost.

Description

±500kV double circuit linear corner tower on the same tower

technical field

The utility model relates to the technical field of high-voltage direct current transmission, in particular to a ±500kV same-tower double-circuit linear corner tower.

Background technique

The dual-circuit DC transmission technology on the same tower generally refers to the transmission technology in which the two circuits share the same pole. The use of the same-tower dual-circuit power transmission technology can reduce the tower material index, basic index, corridor width, etc. of the unit transmission capacity, and reduce the power loss during long-distance transmission. For my country's energy distribution and economic development layout, it is imperative to adopt the same-tower dual-circuit DC technology suitable for long-distance transmission.

The double-circuit power transmission line on the same tower is the highway and backbone line for power transmission. Once a problem occurs, the consequences will be extremely serious. If the transmission tower breaks down, it will lead to power interruption and grid collapse, causing incalculable economic losses and serious social consequences. Therefore, the double-circuit transmission line on the same tower has higher requirements on the safety and reliability of the transmission tower. In addition to meeting the electrical professional requirements, the double-circuit linear corner tower on the same tower also bears the vertical load and horizontal tension load of the ground wire, which plays a key role in the safety and reliability of the line.

Contents of the invention

The purpose of the utility model is to provide a ±500kV same-tower double-circuit linear corner tower that is safe, reliable, economically reasonable, beautiful in appearance, and capable of carrying high-voltage power transmission.

In order to achieve the above purpose, the ±500kV same-tower double-circuit linear corner tower designed by the utility model includes a tower body with tower legs at the bottom, and the head of the tower body is provided with an upper cross arm and a horizontally arranged upper and lower layers. The lower cross-arm, the left and right ends of the top of the upper cross-arm are provided with ground wire supports, which are characterized in that: the upper cross-arm is hung with two upper L-shaped insulator strings on the left and right, and the left end of the upper cross-arm is provided with a For the lower bent arm, two left and right lower L-shaped insulator strings are suspended on the lower cross arm, and the left end of the lower cross arm is provided with a downward bent arm.

Further, the two upper L-shaped insulator strings are distributed on the left and right sides of the tower body, and the two hanging points of the upper L-shaped insulator string on the left are respectively located at the end of the crank arm of the upper cross arm and the left part of the upper cross arm near the tower. In the body, the two hanging points of the upper L-shaped insulator string on the right are respectively located on the tower body connected to the upper cross arm and the right end of the upper cross arm. The design and suspension method of the L-shaped insulator strings not only meet the requirements of the electrical clearance, but also make the structural force reasonable, reducing the number of tower materials and insulators.

Furthermore, the two lower L-shaped insulator strings are also distributed on the left and right sides of the tower body, and the two hanging points of the lower L-shaped insulator string on the left are respectively located at the end of the crank arm of the lower cross-arm and the left side of the lower cross-arm. The bottom is close to the tower body, and the two hanging points of the lower L-shaped insulator string on the right are respectively located on the tower body connected to the lower cross arm and the right end of the lower cross arm. The design and suspension method of the L-shaped insulator strings not only meet the requirements of the electrical clearance, but also make the structural force reasonable, reducing the number of tower materials and insulators.

Still further, the ground wire brackets at the left and right ends of the top of the upper cross arm are not symmetrical with the tower body as the center.

The utility model has the advantages of: the double-circuit straight-line corner tower of the same tower proposed by the utility model has a beautiful appearance, and the arrangement form of the asymmetrical L-series insulators not only meets the requirements of the electrical gap, but also makes the structural stress reasonable, reducing the number of tower materials and insulators , and the irregular cross-arm structure and the special hanging point position cause the asymmetry of the structure, which makes it have different mechanical characteristics from the general tower.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model ±500kV double-circuit linear corner tower on the same tower.

In the figure: tower body 1, tower central axis 1.1, bottle mouth 1.2, tower leg 2, upper cross arm 3, lower cross arm 4, upper curved arm 5, lower curved arm 6, ground wire bracket 7, ground wire hanging point 7.1, the upper L-shaped insulator string 8, the lower L-shaped insulator string 9, the wire 10, the distance W1 between the ground wire hanging point on the ground wire bracket on the left side of the tower body and the central axis of the tower body, and the ground wire on the right side of the tower body The distance W2 between the ground wire hanging point on the wire support and the central axis of the tower body.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

The ±500kV double-circuit linear corner tower on the same tower as shown in the figure includes a tower body 1 with tower legs 2 at the bottom, and an upper cross-arm 3 and a lower cross-arm 4 arranged horizontally on the upper and lower floors of the tower body 1 , the left and right ends of the top of the upper cross arm 3 are provided with ground wire supports 7, and the upper cross arm 3 is hung with two upper L-shaped insulator strings 8 on the left and right, and the left end of the upper cross arm 3 is provided with a downwardly bent upper curved arm 5 , There are also left and right lower L-shaped insulator strings 9 suspended on the lower cross-arm 4 , and a lower curved arm 6 bent downward is provided at the left end of the lower cross-arm 4 .

Among them, the two upper L-shaped insulator strings 8 are distributed on both sides of the tower body 1, and the two hanging points of the upper L-shaped insulator string 8 on the left side of the tower body 1 are respectively located at the end of the upper crank arm 5 and the left side of the upper cross arm 3. The top is close to the tower body 1, and the two hanging points of the upper L-shaped insulator string 8 on the right side of the tower body 1 are located on the tower body 1 connected to the upper cross arm 3 and the right end of the upper cross arm 3 respectively. The two lower L-shaped insulator strings 9 are also distributed on both sides of the tower body 1, wherein the two hanging points of the lower L-shaped insulator string 9 on the left side of the tower body 1 are located at the end of the lower curved arm 6 and the left side of the lower cross arm 4 respectively. Near the tower body 1, the two hanging points of the lower L-shaped insulator string 9 on the right side of the tower body 1 are located on the tower body 1 connected to the lower cross arm 4 and the right end of the lower cross arm 4 respectively.

The height of each tower leg 2 can be designed according to the topography of the installation site of the ±500kV double-circuit linear corner tower on the same tower, and can be all or partly the same, or uniformly designed to be the same height. Usually, the long and short legs are designed according to the terrain of the installation site, which can reduce the square base of the tower base in mountainous areas, without damaging the terrain and vegetation, and is conducive to environmental protection.

The tower body 1 extends above the tower legs 2, and the central axis of the tower body 1 is substantially perpendicular to the horizontal plane.

The upper cross-arm 3 and the lower cross-arm 4 adopt a truss structure, and the space enclosed by the upper cross-arm 3 , the lower cross-arm 4 and the tower body 1 satisfies the requirements for the electrical clearance of side-phase conductors for high-voltage power transmission. Compared with single-circuit ±500kV and below transmission lines, the tower body 1, conductor cross-arm (upper cross-arm 3, lower cross-arm 4), ground wire support 7 and tower leg 2 of the double-circuit high-voltage transmission tower on the same tower must be corresponding Plus size. The size design of the tower body 1 should fully consider the burden brought by the increased conductor cross arm and the ground wire support 7 to the tower body 1. In addition, severe weather such as strong wind, low temperature, and ice cover will increase the load in the form of The adverse effects on the entire double-circuit straight-line corner tower on the same tower must be fully considered in the design of the tower body 1.

The ground wire bracket adopts a truss structure, and the left and right ground wire brackets are not symmetrical to the center of the tower body 1. The space surrounded by the ground wire bracket 7 on the right side of the tower body 1, the tower body 1, and the upper cross arm 3 The electrical clearance requirements for high-voltage power transmission must be met; the space enclosed by the ground wire support 7 on the left side of the tower body 1, the tower body 1, and the upper cross arm 5 must meet the electrical clearance requirements for high-voltage power transmission.

The protection angle of the utility model ±500kV double-circuit straight-line corner tower with the same tower is a negative protection angle, that is, the distance W2 between the ground wire hanging point 7.1 on the ground wire bracket 7 on the right side of the tower body 1 and the tower body central axis 1.1 is greater than the upper horizontal The distance between the wire 10 on the right side of the shoulder 3 and the lower cross arm 4 and the central axis of the middle tower body 1.1, and the distance W1 between the ground wire hanging point 7.1 on the left ground wire support 7 and the central axis of the tower body 1.1 is greater than that of the upper horizontal The distance between the wire 10 on the left side and the central axis of the tower body 1.1 on the bearer 3 and the lower cross arm 4.

The slope of the tower body 1 above its bottle mouth 1.2 is smaller than the slope of the tower body below its bottle mouth 1.2, and the slope is the angle formed between the outer surface of the tower body 1 and the vertical direction. The higher the voltage transmitted by the double-circuit straight-line corner tower on the same tower, the larger its overall size and the larger the wire diameter. Considering that the double-circuit straight-line corner tower with the same tower needs vertical load and horizontal tension, the tower body 1 needs to be designed with a suitable slope so that the entire double-circuit straight-line corner tower with the same tower can resist the load and reduce the steel consumption of the tower. minimum. The slope of the tower body 1 below its bottle 1.2 is greater than its slope above the bottle mouth 1.2, which conforms to the stress situation of the entire tower body.

The used steel of the utility model adopts the angle steel of Q420, Q345 and Q235 three kinds of materials.

The design of the ±500kV same-tower double-circuit straight-line corner tower of the utility model, the size of the tower head can meet the electrical clearance requirements of the double-circuit DC high-voltage transmission; and through reasonable structural design and material selection, the design has sufficient mechanical strength, It can withstand the increase of various loads caused by the increase in the size of the entire tower due to the increase in the circuit and the arrangement of the asymmetric L-string of insulators, and reduce the amount of steel used in the tower.

The above descriptions are only preferred examples of the present utility model, and are not intended to limit the protection scope of the present utility model. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model are included in the protection scope of the present utility model.

Other parts not specified in detail belong to the prior art.

Claims (4)

1. A ±500kV double-circuit linear corner tower with the same tower, comprising a tower body (1) with tower legs (2) at the bottom, and the head of the tower body (1) is provided with upper and lower horizontally arranged upper horizontal Bear (3) and lower cross arm (4), the left and right ends of the top of the upper cross arm (3) are provided with ground wire brackets (7), characterized in that: the upper cross arm (3) is hung with left and right Two upper-layer L-shaped insulator strings (8), the left end of the upper cross-arm (3) is provided with a downwardly bent upper crank arm (5), and the lower cross-arm (4) is also hung with left and right lower layers In the L-shaped insulator string (9), the left end of the lower cross arm (4) is provided with a lower curved arm (6) bent downward. 2. The ±500kV double-circuit linear corner tower with the same tower according to claim 1, characterized in that: the two upper layer L-shaped insulator strings (8) are distributed on the left and right sides of the tower body (1), wherein the upper layer on the left The two hanging points of the L-shaped insulator string (8) are respectively located at the end of the upper crank arm (5) and the left part of the upper cross-arm (3) near the tower body (1), and the upper L-shaped insulator string (8) on the right The two hanging points are respectively located on the tower body (1) connected with the upper cross arm (3) and the right end of the upper cross arm (3). 3. The ±500kV double-circuit linear corner tower with the same tower according to claim 1, characterized in that: the two lower L-shaped insulator strings (9) are also distributed on the left and right sides of the tower body (1), wherein the left side The two hanging points of the lower L-shaped insulator string (9) are respectively located at the end of the lower crank arm (6) and the left part of the lower cross-arm (4) near the tower body (1), and the lower L-shaped insulator string on the right ( 9) The two hanging points are respectively located on the tower body (1) connected with the lower cross arm (4) and the right end of the lower cross arm (4). 4. The ±500kV double-circuit linear corner tower with the same tower according to any one of claims 1 to 3, characterized in that: the ground wire brackets (7) at the left and right ends of the top of the upper cross arm (3) are not connected to the tower Body (1) is centrally symmetrical.