CN217680884U

CN217680884U - Triangular double-loop alternating current and direct current common-tower power transmission iron tower

Info

Publication number: CN217680884U
Application number: CN202120290772.9U
Authority: CN
Inventors: 李聚昭; 叶伟; 王玉雷; 王睿; 张宁; 邹峥; 刘玮; 刘伟; 张东亮; 周晋; 侯聪; 柏丹丹
Original assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Current assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2022-10-28
Anticipated expiration: 2031-02-02

Abstract

The utility model relates to a power transmission iron tower with double-loop alternating current and direct current sharing towers arranged in a triangle, wherein three layers of wire cross arms connected with two sides of a tower body are sequentially and symmetrically arranged from top to bottom, and the wire cross arms are an upper wire cross arm, a middle wire cross arm and a lower wire cross arm from top to bottom; the power transmission iron tower is also provided with +/-500 kV direct-current lines, and a positive line and a negative line of the power transmission iron tower are suspended on the upper lead cross arm and are respectively arranged on two sides of the tower body; and three-phase 500kV alternating current circuit, it contains the three-phase alternating current wire, and set up in well wire cross arm with on the wire cross arm down, the utility model discloses a neotype, reasonable wire arrangement mode, when reducing the circuit corridor, can be great reduce the iron tower height to alleviate the tower weight, have obvious economic benefits.

Description

Triangular double-loop alternating current and direct current common-tower power transmission iron tower

Technical Field

The utility model relates to a transmission tower of crossing, dc transmission line tower design altogether, especially indicate a triangle-shaped arranges that double circuit exchanges and dc is tower transmission tower altogether.

Background

At present, the transmission of a 500kV double-loop alternating current and +/-500 kV direct current transmission line is usually realized by adopting a tower-splitting parallel erection mode. Although this transportation method for split tower erection can meet basic power transmission needs, it is often accompanied by the problems of congestion of the passage corridor and difficulty in selecting the position of the tower footing. Especially in economically developed areas, the problem of congestion of the corridor is more prominent, which will reduce the passing ability of the transmission line. Meanwhile, the occupied area required by the parallel erection of the multiple lines in the tower is large, so that the waste of land resources is caused, the influence on the surrounding environment is large, and a great deal of inconvenience is caused to related production life and city planning. Therefore, the arrangement of the common tower line is particularly important.

As shown in fig. 1, is a line layout diagram of a 750kV double-loop alternating current and ± 800kV extra-high voltage direct current common tower line iron tower. In the scheme, a 750kV alternating current transmission line is hung on the end sides of a lower layer wire cross arm, a middle layer wire cross arm and an upper layer wire cross arm through an I-shaped insulator string, and a +/-800 kV direct current transmission line is hung below a ground wire support through a V-shaped insulator string. Due to the adoption of the vertical arrangement mode from top to bottom, the total height of the iron tower is higher, the weight of the iron tower is heavier, steel materials of the iron tower are not beneficial to saving, and the limitation is caused when a height-limiting area near a city and other transmission lines need to be drilled.

For another example, fig. 2 is a circuit layout diagram of a 500kV double-circuit alternating current and ± 800kV extra-high voltage direct current common tower line iron tower. Although the scheme adopts the triangular arrangement mode of the alternating-current line conductors, the height of the tower can be reduced to a certain extent compared with the full-vertical arrangement mode of figure 1 by suspending the 2-phase alternating-current line on the 1-layer cross arm, but the problem caused by the high height of the tower cannot be solved based on the requirements on the clearance of the electric appliance and the distance to the ground.

Fig. 3 is a line layout diagram of a tangent tower of a transmission line of a 500kV double-loop alternating current and +/-500 kV direct current common tower line. In the scheme, direct-current positive and negative circuits are respectively hung in 2 tower windows on the upper layer and the lower layer, and a three-phase alternating-current circuit is respectively hung at the end parts of 3 layers of lead cross arms by adopting I-shaped insulator strings. In addition, the line arrangement scheme is limited by the tower type of the power transmission iron tower and is only suitable for the power transmission iron tower with a tower window. And for the line iron tower which is used most at the present stage, the arrangement scheme needs to be redesigned.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a 500kV double circuit that triangle-shaped arranged exchanges and 500kV direct current sharing transmission tower of tower design.

The technical means adopted by the utility model are as follows.

A power transmission iron tower with a triangular arrangement and a 500kV double-loop alternating current and +/-500 kV direct current common tower design is characterized in that three layers of wire cross arms connected with two sides of a tower body are sequentially and symmetrically arranged from top to bottom, and the wire cross arms are an upper wire cross arm, a middle wire cross arm and a lower wire cross arm from top to bottom; the power transmission tower is also provided with a +/-500 kV direct-current line, and a positive line and a negative line of the power transmission tower are suspended on the upper lead cross arm and are respectively arranged on two sides of the tower body. And a three-phase 500kV alternating-current line which comprises a three-phase alternating-current lead and is arranged on the middle lead cross arm and the lower lead cross arm.

Furthermore, one-phase alternating current wires of the three-phase alternating current wires are hung on the middle wire cross arm, the other two-phase alternating current wires are hung on the lower wire cross arm, and each alternating current wire is symmetrically distributed on two sides of the tower body.

Further, the three-phase alternating-current lead comprises an A-phase alternating-current lead, a B-phase alternating-current lead and a C-phase alternating-current lead. Wherein, the A AC conducting wire is suspended at the end part of the middle conducting wire cross arm; the B-phase alternating current lead and the C-phase alternating current lead are suspended on the lower lead cross arm, the C-phase alternating current lead is suspended at the end part of the lower lead cross arm, and the B-phase alternating current lead is suspended between the tower body and the C-phase alternating current lead.

Furthermore, two-phase alternating current wires of the three-phase alternating current wires are hung on the middle wire cross arm, the other one-phase alternating current wires are hung on the lower wire cross arm, and each alternating current wire is symmetrically distributed on two sides of the tower body.

Further, the +/-500 kV direct-current line and the three-phase 500kV alternating-current line are respectively hung on the power transmission iron tower through a V-shaped insulator string and an I-shaped insulator string.

Furthermore, the top parts of the two ends of the upper wire cross arm extend upwards in an inclined mode to form a ground wire support.

The utility model discloses produced beneficial effect as follows.

(1) The utility model discloses according to 500kV direct current and 500kV interchange electric clearance and to the ground distance requirement, arrange direct current and alternating current wire on same iron tower rationally, increase the possibility that the route passes through, the circuit corridor that has significantly reduced saves the land.

(2) The utility model discloses a circuit arrangement does not receive the restriction of tower type, can extensively be applicable to multiple tower type. Meanwhile, the compact symmetrical arrangement mode enables the stress to be more reasonable and the tower weight index to be more excellent.

(3) The utility model discloses a wire arrangement mode more can effectively reduce the iron tower height than the whole perpendicular arrangement mode of wire (like figure 1) under the same condition.

(4) In addition, the method can greatly save the steel materials and the base materials of the iron tower, and has remarkable economic benefit.

Drawings

FIG. 1 is a line layout diagram of a 750kV double-loop alternating current and +/-800 kV extra-high voltage direct current common tower line iron tower.

FIG. 2 is a line layout diagram of a 500kV double-loop alternating current and +/-800 kV extra-high voltage direct current common tower line iron tower.

Fig. 3 is a line layout diagram of a tangent tower of a power transmission line of a 500kV double-loop alternating current and +/-500 kV direct current common tower line.

Fig. 4 is a schematic diagram of the iron tower structure of the present invention.

Detailed Description

The utility model discloses a can exchange two return circuits 500kV and transmission line straight line iron tower of 500kV direct current transmission line design altogether. It carries out reasonable analysis and arrangement to tower type altogether according to the electric clearance of +500kV direct current and 500kV alternating current and to ground distance requirement, has adopted the following arrangement mode: the direct current and alternating current wires are symmetrically arranged from top to bottom in sequence in a left-right mode in three layers, the positive pole and the negative pole of the direct current are symmetrically arranged at two ends of an upper wire cross arm of the iron tower by using V-shaped insulator strings, the phase A of an alternating current circuit is symmetrically arranged at two ends of a middle wire cross arm of the iron tower by using I-shaped insulator strings, and the phase B, C of the alternating current circuit is symmetrically arranged at a lower wire cross arm of the iron tower in parallel by using the I-shaped insulator strings; the two layers of three-phase alternating current wires arranged on the upper wire cross arm and the middle wire cross arm are integrally arranged in a triangular shape. The wire arrangement mode of the utility model makes the force transmission path simpler; although the total height of the iron tower is slightly higher (the utility model discloses a transmission tower height is about 78.99m, and the total height of the tower of fig. 1-3 is about 78.3 m), but the tower weight is lighter (when the body slope of the tower is 0.12, the utility model discloses a total weight of transmission tower is about 48.3 tons, and the total weight of the tower of fig. 1-3 is about 60.5 tons), has obvious economic advantage on the whole.

As shown in fig. 4, the transmission tower is a symmetrical structure as a whole, and includes a tower body 1 and three layers of wire cross arms 2 symmetrically arranged on two sides of the tower body 1 from top to bottom. The wire cross arm 2 is sequentially provided with a lower wire cross arm 203, a middle wire cross arm 202 and an upper wire cross arm 201 along the tower height direction. The top parts of the two ends of the upper wire cross arm 201 extend upwards and outwards symmetrically to form a ground wire bracket 3 for hanging a ground wire (a lightning wire), and the upper wire cross arm 201 and the ground wire bracket 3 are integrally in a 'official cap' shape.

Tangent tower structure based on above-mentioned symmetry divides the tower to erect the problem that transmission line route corridor is crowded, column foot selection position difficulty in parallel for solving many circuit, the utility model discloses mainly adopt: hanging a +/-500 kV direct-current line on the end part of the upper lead cross arm 201 by adopting a V-shaped insulator string 4; and respectively hanging three-phase alternating-current leads of a three-phase 500kV alternating-current circuit on the middle lead cross arm 202 and the lower lead cross arm 203 by adopting an I-shaped insulator string 5. And calculating to obtain the length and the included angle of the V-shaped insulator string for hanging the direct current line, the length of the I-shaped insulator string for hanging the alternating current wire and the electric clearance which meet the wire requirements.

Example 1. A positive electrode line 41 and a negative electrode line 42 of the +/-500 kV direct current line are hung on the upper conducting wire cross arm 201 and are respectively arranged on two sides of the tower body 1; one-phase alternating current wires of the three-phase alternating current wires are suspended on the middle wire cross arm 202, the other two-phase alternating current wires are suspended on the lower wire cross arm 203, and each cross current wire is symmetrically distributed on two sides of the tower body 1.

Specifically, in a preferred embodiment of the present invention, the power transmission line is arranged in the following manner: hanging a positive line 41 of the +/-500 kV direct-current line at the left end of the upper wire cross arm 201 by adopting a V-shaped insulator string 4; the negative pole line 42 of the +/-500 kV direct current line is hung at the right end of the upper lead cross arm 201 by a V-shaped insulator string 4. Preferably, the positive electrode lines 41 and the negative electrode lines 42 are symmetrically arranged and further arranged on two sides of the tower body 1.

More importantly, the three-phase ac line includes an a-phase ac line 51, a B-phase ac line 52, and a C-phase ac line 53. Wherein, the A-phase alternating current lead 51 is symmetrically suspended on two ends of the middle lead cross arm 202 by adopting an I-type insulator string 5; the B-phase ac conductor 52 and the C-phase ac conductor 53 are suspended from the lower conductor cross arm 203 by using an I-type insulator string 5, the C-phase ac conductor 53 is suspended from an end of the lower conductor cross arm 203, and the B-phase ac conductor 52 is suspended between the tower body 1 and the C-phase ac conductor 53. And each alternating current lead is symmetrically distributed on two sides of the tower body 1.

Example 2. Compared with embodiment 1, the difference is only in the arrangement of the three-phase alternating current wires: in this embodiment, two phase ac wires of the three phase ac wires are suspended on the middle wire cross arm 202, the other phase ac wires are suspended on the lower wire cross arm 203, and each cross current wire is symmetrically arranged on two sides of the tower body 1. In practical application, on the basis of paying attention to appearance arrangement, rod piece size, stress analysis and the like, an arrangement scheme which enables the overall tower weight index to be lower is preferentially selected through comparison after modeling calculation.

The utility model discloses a transmission line tangent tower arranges the two poles of the earth circuit of direct current in the top of two times alternating current circuit, will occupy originally two transmission lines in two corridors and merge in a transmission of electricity passageway to great degree reduces circuit corridor width, reduces the column foot and takes up an area of, increases the possibility that the route passes through.

The description of the present invention is only for the purpose of illustrating the principles and preferred embodiments of the present invention, and it is to be understood that the present invention is not limited to the details of the foregoing description, as well as various changes and modifications which fall within the scope of the appended claims.

Claims

1. A power transmission iron tower with double loops of alternating current and direct current sharing a tower is triangularly arranged, three layers of lead cross arms (2) connected with two sides of a tower body (1) are sequentially and symmetrically arranged on the power transmission iron tower from top to bottom, and the power transmission iron tower is characterized in that the lead cross arms (2) are an upper lead cross arm (201), a middle lead cross arm (202) and a lower lead cross arm (203) from top to bottom in sequence; the transmission tower is further provided with:

+/-500 kV direct current line: an anode line (41) and a cathode line (42) are suspended on the upper lead cross arm (201) and are respectively arranged at two sides of the tower body (1);

three-phase 500kV alternating current circuit: comprises three-phase alternating current conductors, which are arranged on the middle conductor cross arm (202) and the lower conductor cross arm (203).

2. The pylon according to claim 1, wherein one phase of the three phase ac conductors is suspended from the middle conductor cross arm (202), the remaining two phase ac conductors are suspended from the lower conductor cross arm (203), and each phase ac conductor is symmetrically arranged on both sides of the pylon body (1).

3. The pylon according to claim 2 wherein the three-phase AC conductors comprise an A-phase AC conductor (51), a B-phase AC conductor (52) and a C-phase AC conductor (53);

wherein the A-phase alternating current conductor (51) is suspended at the end of the middle conductor cross arm (202); the B-phase alternating current lead (52) and the C-phase alternating current lead (53) are suspended from the lower lead cross arm (203), the C-phase alternating current lead (53) is suspended from an end portion of the lower lead cross arm (203), and the B-phase alternating current lead (52) is suspended between the tower body (1) and the C-phase alternating current lead (53).

4. The pylon according to claim 1, wherein two of the three-phase AC conductors are suspended from the middle conductor cross arm (202), the remaining one-phase AC conductors are suspended from the lower conductor cross arm (203), and each of the three-phase AC conductors are symmetrically arranged on both sides of the pylon body (1).

5. The delta-arranged double-circuit ac and dc common tower pylon according to any one of claims 1 to 4 wherein said ± 500kV dc link and said three-phase 500kV ac link are suspended from said pylon by means of V-insulator strings (4) and I-insulator strings (5), respectively.

6. The pylon according to any one of claims 1 to 4 wherein ground supports (3) extend obliquely upward at the top of the two ends of the upper conductor cross arm (201).