CN216110007U - Branch tower for double-loop direct current transmission line - Google Patents

Abstract

The utility model provides a bifurcation tower for a double-loop direct-current transmission line, which comprises a tower body, wherein two pole lead cross arms are arranged on the tower body, pole leads are hung on the two sides of the tower body by the two pole lead cross arms, a first ground wire bracket is arranged on the tower body above the two pole lead cross arms, and a plurality of ground wires laid along the direction of the pole leads are arranged on the first ground wire bracket; the tower body below the two-pole wire cross arm is provided with the metal return wire cross arm, the metal return wire cross arm is provided with the metal return wires in a hanging mode on two sides of the tower body, the upper portion of the metal return wire cross arm is provided with the second ground wire support, the tower body on the same horizontal plane with the second ground wire support is provided with the ground wire hanging point, and the second ground wire support and the ground wire hanging point are provided with a plurality of ground wires laid along the direction of the metal return wires.

Description

Branch tower for double-loop direct current transmission line

Technical Field

The utility model relates to the field of power transmission, in particular to a branching tower for a double-loop direct-current transmission line.

Background

With the continuous development of power grids in China, the contradiction that overhead lines occupy land is increasingly prominent, and meanwhile, in order to solve the problem of sending out new energy such as wind, light and the like, the flexible direct-current transmission technology is rapidly developed. At present, most +/-500 kV and +/-800 kV high-voltage direct-current power transmission and transformation projects in China adopt single-circuit erection, obstacles near a path corridor in an economically developed area are numerous, the surrounding environment is complex, direct-current power transmission adopts a single circuit, a grounding electrode station site and a grounding electrode line are independently constructed, the occupied area of the station site and the line corridor is greatly increased, and the project investment is also greatly increased.

The double-loop direct-current high-voltage transmission line greatly saves a line corridor, and also can save a grounding electrode site and the occupation area of the line corridor to a certain extent, but the existing iron tower applicable to the double loops is not reasonable in structural design, and has disordered lines, thereby causing a series of problems of difficult station entry and the like.

SUMMERY OF THE UTILITY MODEL

The technical problem solved by the utility model is to provide a branching tower for a double-loop direct current transmission line, wherein a pole lead and a metal return line are erected on the same tower and can be divided into three paths to be respectively connected into a converter station, so that the problem of station entry of the double-loop direct current transmission line with the metal return line is solved.

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

a bifurcation tower for a double-loop direct current transmission line comprises a tower body, wherein two pole lead cross arms are arranged on the tower body, pole leads are hung on the two sides of the tower body by the two pole lead cross arms, a first ground wire support is arranged on the tower body above the two pole lead cross arms, and a plurality of ground wires are laid on the first ground wire support along the direction of the pole leads; the tower body below the two-pole wire cross arm is provided with a metal return wire cross arm, the metal return wire cross arm is provided with metal return wires in a hanging mode on two sides of the tower body, a second ground wire support is arranged on the upper portion of the metal return wire cross arm, a ground wire hanging point is arranged on the tower body on the same horizontal plane with the second ground wire support, and a plurality of ground wires laid along the direction of the metal return wires are arranged on the second ground wire support and the ground wire hanging point.

Preferably, the two pole wire cross arms include an upper pole wire cross arm and a lower pole wire cross arm, the upper pole wire cross arm is located above the lower pole wire cross arm, and the upper pole wire cross arm and the lower pole wire cross arm are provided with one pole wire in a hanging manner on two sides of the tower body. The pole wire on each side can be arranged into one pole wire, or can be correspondingly arranged into a plurality of pole wires according to actual needs.

Preferably, the two pole wires suspended on the upper pole wire cross arm are negative pole wires, and the two pole wires suspended on the lower pole wire cross arm are positive pole wires. Wherein, the upper and lower positions of the positive and negative leads can be set according to actual requirements.

Preferably, each pole wire is connected with the pole wire cross arm through a strain insulator, the pole wires are connected with the strain insulator through jumper wires on two sides of the strain insulator, and the jumper wires are connected with the pole wire cross arm through a V-shaped insulator string. Of course, the connection mode of the jumper wire and the pole lead cross arm is not limited to this, and the jumper wire and the pole lead cross arm can be connected through a connection structure such as an I-shaped insulator string.

Preferably, a first ground wire support is arranged on the tower body above the upper-layer pole wire cross arm, four ground wires are arranged on the front side of the first ground wire support in the line direction in a hanging mode, and two ground wires are arranged on the rear side of the first ground wire support in the line direction in a hanging mode. The reason for this arrangement is that the branching tower is a transmission line side at the rear side of the branching tower and a framework side to be connected to the terminal tower at the front side of the branching tower according to the line transmission direction, wherein at the line side, the positive and negative leads on the upper and lower layer pole lead cross arms are laid in the same direction, that is, one positive lead and one negative lead are respectively arranged at two sides of the tower body, and the pole lead positioned at one side is laid in the same direction, so that only two ground wires need to be arranged at two sides of the tower body at the line side for respectively protecting the positive and negative leads at one side of the tower body; on the framework side of the branching tower, the positive wire needs to be connected into the positive terminal tower, the negative wire needs to be connected into the negative terminal tower, and the branching tower is divided into different directions, so that on the framework side, four ground wires need to be arranged on the first ground wire support, two of the four ground wires are connected into the positive terminal tower along the direction of the positive wire, and the other two ground wires are connected into the negative terminal tower along the direction of the negative wire.

Preferably, a metal return wire cross arm is arranged on the tower body below the lower-layer pole wire cross arm, two metal return wires are hung on the two sides of the tower body by the metal return wire cross arm, and the metal return wires are arranged at intervals according to the minimum distance. The number of the metal return lines can be adjusted according to actual needs.

Preferably, each metal return wire is connected with the metal return wire cross arm through a strain insulator, the metal return wires are connected with the two sides of the strain insulator through jumper wires, and the jumper wires are connected with the metal return wire cross arm through an I-type insulator string. The jumper wire can also be connected with the metal return wire cross arm through a V-shaped insulator string and the like.

Preferably, the second ground wire supports are arranged on two sides of the tower body on the upper portion of the metal return wire cross arm, one ground wire is hung on each second ground wire support, one ground wire hanging point is arranged on each of two sides of the tower body on the same horizontal plane with the two second ground wire supports, and one ground wire is hung on each ground wire hanging point. The ground wire can be suspended in other manners, wherein the ground wire and the metal return wire are the same in number.

Preferably, the second ground support and four ground wires suspended from the ground wire hanging point are provided on the front side of the tower body in the direction along the line.

Preferably, the ground wire is a common ground wire or an OPGW optical cable. The protective circuit can play a role in protecting the electrode lead and the metal return line and protecting the circuit from lightning stroke.

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

the utility model relates to a branching tower for a double-reflux direct-current circuit, which is a double-loop direct-current circuit, wherein positive and negative pole leads are respectively connected into a positive pole terminal tower and a negative pole terminal tower in two directions, and then are connected into a positive pole framework and a negative pole framework of a converter station, meanwhile, a metal return line is used as a ground return system, four groups of metal return lines are arranged, the metal return line independently forms one path, is positioned between the positive and negative pole leads, is connected into a metal return line cross arm, and then is connected into the metal return line framework of the converter station. By adopting the bifurcation tower structure, the problem that the anode and cathode poles of the bifurcation tower of the double-loop direct current transmission line and the metal return line are independently bifurcated is effectively solved, the problem of lightning protection of the metal return line is solved by independently arranging the ground wire on the metal return line, and the problem that the transmission lines with the metal return line of the double-loop direct current transmission line respectively enter the station is successfully solved.

Drawings

Fig. 1 is a schematic structural diagram of a bifurcation tower for a dual-loop dc power transmission line according to the present invention;

FIG. 2 is a schematic diagram of the incoming line direction of the branching tower of the present invention.

The tower body is 1, the upper-layer pole wire cross arm is 2, the lower-layer pole wire cross arm is 3, the metal return wire cross arm is 4, the first ground wire support is 5, the second ground wire support is 6, the ground wire hanging point is 7, the 8-V-shaped insulator string is 9-I-shaped insulator string;

10-positive wire, 11-negative wire, 12-metal return wire, 13-first ground wire, 14-positive terminal tower, 15-positive terminal tower pole wire cross arm, 16-positive terminal tower ground wire support, 17-negative terminal tower, 18-negative terminal tower pole wire cross arm, 19-negative terminal tower ground wire support, 20-metal return terminal tower, 21-metal return terminal tower cross arm, 22-metal return terminal tower ground wire support, 23-second ground wire.

Detailed Description

Referring to fig. 1-2, the following examples are provided:

the utility model protects a branching tower for a double-loop direct-current transmission line, which can be applied to various voltage grades, and is described by taking a tower type based on a +/-500 kV voltage grade as an example, the double-loop direct-current transmission line with other voltage grades can also use the arrangement mode, and the tower types with different voltage grades can be determined by a person skilled in the art according to actual requirements in the aspects of cross arm size and the like, and are not limited too much.

As shown in fig. 1, a bifurcation tower for a dual-loop direct current transmission line comprises a tower body 1, wherein two polar lead cross arms are arranged on the tower body 1, polar leads are hung on two sides of the tower body 1 by the two polar lead cross arms, a first ground wire bracket 5 is arranged on the tower body 1 above the two polar lead cross arms, and a plurality of ground wires are laid along the polar lead direction on the first ground wire bracket 5; set up metal return wire cross arm 4 on the body of tower 1 of two poles of the earth wire cross arm below, metal return wire cross arm 4 all hangs in the both sides of body of tower 1 and is provided with the metal return wire, and metal return wire cross arm 4 upper portion sets up second ground wire support 6 to set up ground wire hanging point 7 on the body of tower 1 with second ground wire support 6 same horizontal plane, have several ground wires of laying along the metal return wire direction on second ground wire support 6 and the ground wire hanging point 7. Wherein, two utmost point wire cross arms include upper strata utmost point wire cross arm 2 and lower floor's utmost point wire cross arm 3, and upper strata utmost point wire cross arm 2 is located lower floor's utmost point wire cross arm 3's top, and upper strata utmost point wire cross arm 2 and lower floor's utmost point wire cross arm 3 all hang in the both sides of body of the tower 1 and are provided with a utmost point wire. Two polar wires suspended on the upper polar wire cross arm 2 are negative polar wires, and two polar wires suspended on the lower polar wire cross arm 3 are positive polar wires. Each pole wire is connected with the pole wire cross arm through a strain insulator, the pole wires are connected with the strain insulator through jumper wires on two sides of the strain insulator, and the jumper wires are connected with the pole wire cross arm through a V-shaped insulator string 8. In one embodiment, a first ground wire support 5 is provided on the tower body 1 above the upper pole wire cross arm 2, and four ground wires are suspended from the first ground wire support 5 at the front side in the forward direction and two ground wires are suspended at the rear side in the forward direction. In one embodiment, a metal return wire cross arm 4 is arranged on the tower body 1 below the lower-pole wire cross arm 3, two metal return wires are hung on the metal return wire cross arm 4 on two sides of the tower body 1, and the metal return wires are arranged at intervals of a minimum distance. Each metal return wire is connected with the metal return wire cross arm 4 through a strain insulator, the metal return wires are connected with the two sides of the strain insulator through jumper wires, and the jumper wires are connected with the metal return wire cross arm 4 through an I-shaped insulator string 9. Wherein, the tension insulator, the pole wire and the jumper wire are not marked in figure 1, and are all in a conventional arrangement mode. Wherein, the tower body 1 both sides on metal return wire cross arm 4 upper portion all set up a second ground wire support 6, all hang on every second ground wire support 6 and set up a ground wire, and all be provided with a ground wire on the tower body 1 both sides with two second ground wire supports 6 same horizontal plane and hang some 7, all hang on every ground wire and set up a ground wire on hanging some 7. Four ground wires hung on the second ground wire bracket 6 and the ground wire hanging points 7 are arranged on the front side of the tower body 1 along the direction of the circuit. In one embodiment, the ground line is a common ground line or an OPGW optical cable.

In one embodiment, as shown in fig. 2, comprising a branching tower, the branching tower is provided with an upper pole wire cross arm 2, a lower pole wire cross arm 3, a metal return wire cross arm 4, a first ground wire support 5 and a second ground wire support 6, of course the branching tower in fig. 2 is a simplification of fig. 1, the second ground wire support 6 and the ground wire hanging point 7 in fig. 1 are simplified to a second ground wire support 6 in fig. 2, four ground wires are also hung thereon, and as shown in fig. 2, a first ground wire 13 is hung on the first ground wire support 5 and a second ground wire 23 is hung on the second ground wire support 6. An anode terminal tower 14, a cathode terminal tower 17 and a metal return line terminal tower 20 are arranged on the opposite side of the branching tower, wherein the metal return line terminal tower 20 is positioned between the anode terminal tower 14 and the cathode terminal tower 17; an anode terminal tower anode lead cross arm 15 and an anode terminal tower earth wire bracket 16 are arranged on an anode terminal tower 14, an anode lead 10 on a lower layer anode lead cross arm 3 is respectively connected to the anode terminal tower anode lead cross arm 15, two first earth wires 13 on a first earth wire bracket 5 are connected to the anode terminal tower earth wire bracket 16 along the connection direction of the anode lead 10, a cathode terminal tower anode lead cross arm 18 and a cathode terminal tower earth wire bracket 19 are arranged on a cathode terminal tower 17, a cathode lead 11 on an upper layer anode lead cross arm 2 is respectively connected to the cathode terminal tower anode lead cross arm 18, the other two first earth wires 13 on the first earth wire bracket 5 are connected to the cathode terminal tower earth wire bracket 19 along the connection direction of the cathode lead 11, wherein a metal return line terminal tower anode cross arm 21 and a metal return line tower earth wire bracket 22 are arranged on the metal return line terminal tower 20, the four metal return wires 12 on the metal return wire cross arm 4 are respectively connected to the metal return wire terminal tower cross arm 21, and the four second ground wires 23 on the second ground wire support 6 are connected to the metal return wire terminal tower ground wire support 22 along the connection direction of the metal return wires 12. This places the metal return line just in the middle of the positive and negative lines into the converter station.

The utility model is provided with a double-loop direct current circuit, positive and negative pole leads and a common four-pole lead, which are divided into two directions and respectively connected into a positive terminal tower and a negative terminal tower, and then connected into a converter station positive and negative electrode framework, and simultaneously, four groups of metal return lines are provided by adopting the metal return lines as a ground return system, wherein the metal return lines independently form one path, are positioned between the positive and negative leads, are connected into a metal return line cross arm, and then are connected into the converter station metal return line framework. By adopting the bifurcation tower structure, the problem of independent bifurcation of the anode and cathode poles of the bifurcation tower and the metal return line of the double-loop direct current transmission line is effectively solved, the metal return line is independently provided with the ground wire, the lightning protection problem of the metal return line is solved, the problem that the double-loop direct current transmission line with the metal return line enters the station respectively is successfully solved, the iron tower has simple structure and clear and good stress, and is convenient to design, construct, operate and maintain, and the double-loop direct current transmission line with the metal return line and the tower are adopted to jointly support the power transmission technology, so that the iron tower has high economic benefits and social benefits for reducing the occupied area of an overhead transmission corridor and removing houses.

Claims (10)

1. A bifurcation tower for a double-loop direct current transmission line is characterized by comprising a tower body (1), wherein two pole wire cross arms are arranged on the tower body (1), pole wires are hung on the two sides of the tower body (1) by the two pole wire cross arms, a first ground wire support (5) is arranged on the tower body (1) above the two pole wire cross arms, and a plurality of ground wires are laid along the pole wires on the first ground wire support (5); two below the pole wire cross arm set up metal reflux cross arm (4) on tower body (1), metal reflux cross arm (4) are in the both sides of tower body (1) all hang and are provided with the metal reflux, just metal reflux cross arm (4) upper portion sets up second ground wire support (6), and with the same horizontal plane of second ground wire support (6) set up ground wire hanging point (7) on tower body (1), second ground wire support (6) with there is the edge on ground wire hanging point (7) several ground wires that the metal reflux direction was laid.

2. The bifurcation tower of claim 1, wherein the two pole wire cross arms comprise an upper pole wire cross arm (2) and a lower pole wire cross arm (3), the upper pole wire cross arm (2) is located above the lower pole wire cross arm (3), and the upper pole wire cross arm (2) and the lower pole wire cross arm (3) are provided with one pole wire hanging on both sides of the tower body (1).

3. The bifurcation tower of claim 2, wherein the two pole wires suspended by the upper pole wire cross arm (2) are negative pole wires, and the two pole wires suspended by the lower pole wire cross arm (3) are positive pole wires.

4. The bifurcation tower for a dual-circuit DC power transmission line according to claim 2, wherein each of said pole conductors is connected to said pole conductor cross-arm by a tension insulator and said pole conductors are connected on either side of said tension insulator by jumpers connected to said pole conductor cross-arm by a V-string insulator (8).

5. The branching tower for a double-circuit direct-current transmission line according to claim 2, wherein the first ground wire bracket (5) is provided on the tower body (1) above the upper pole wire cross arm (2), and four ground wires are suspended from the first ground wire bracket (5) on the front side in the direction of the line, and two ground wires are suspended from the rear side in the direction of the line.

6. The bifurcation tower for a dual-loop DC power transmission line according to claim 1, wherein said metal return wire cross arm (4) is provided on said tower body (1) below said lower pole wire cross arm (3), two metal return wires are suspended from said metal return wire cross arm (4) on both sides of said tower body (1), and said metal return wires are spaced apart from each other by a minimum phase distance.

7. The bifurcation tower for a dual-circuit DC power transmission line according to claim 6, characterized in that each of said metallic return wires is connected to said metallic return wire cross arm (4) by a strain insulator and said metallic return wires are connected on both sides of the strain insulator by jumpers connected to said metallic return wire cross arm (4) by means of an I-insulator string (9).

8. The branching tower for the double-circuit direct current transmission line according to claim 6, wherein one second ground bracket (6) is arranged on each side of the tower body (1) on the upper part of the metal return cross arm (4), one ground wire is hung on each second ground bracket (6), one ground wire hanging point (7) is arranged on each side of the tower body (1) on the same horizontal plane with the two second ground brackets (6), and one ground wire is hung on each ground wire hanging point (7).

9. The branching tower for a two-circuit dc power transmission line according to claim 8, wherein four ground wires suspended from the second ground bracket (6) and the ground wire hanging point (7) are provided on the front side of the tower body (1) in the direction of the line.

10. A branching tower for a dual-loop dc transmission line according to claims 1-9, wherein the ground line is a common ground line or an OPGW optical cable.

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