750KV single-loop full-cycle transposition tower

Abstract

The invention relates to the technical field of power transmission line transposition towers, in particular to a 750 kilovolt single-loop full-cycle transposition tower. The device comprises a tower body, the top of the tower body is fixedly provided with the wire cross arm, the top of the wire cross arm is fixedly provided with the ground wire support, the top end of the ground wire support is fixedly provided with the left jumper frame and the right jumper frame respectively, the left end of the wire cross arm is fixedly provided with the left jumper frame capable of changing positions, and the middle of the wire cross arm is fixedly provided with the right jumper frame capable of changing positions. According to the invention, the structure is reasonable and compact, the use is convenient, through the cooperative use of the tower body, the left jumper frame, the right jumper frame, the left jumper bracket and the right jumper bracket, the phase sequence of the three-phase lead at the front and rear sides of the tower body is changed, a full-cycle transposition is completed, the characteristics of safety, reliability and small occupied area are realized, the operation is convenient, and the manufacturing cost is greatly reduced; and meanwhile, the electrical gap and the three-phase load unbalance degree both meet the design specification and the power grid operation requirements.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line transposition towers, in particular to a 750 kV single-circuit full-circulation transposition tower. Background Art

[0002] The AC transmission line uses three-phase conductors A, B, and C to connect the substations at both ends. In the power grid with direct grounding at the neutral point, transmission lines with a length of more than 100 km must be transposed. The purpose of line transposition is to reduce unbalanced current and unbalanced voltage during normal operation of the power system.

[0003] At present, there are generally many ways to transpose a single circuit, mainly including: one is the transposition of a special-shaped "dry" tension tower combined with two independent sub-towers. This traditional transposition method of the main tower combined with two sub-towers has a large tower base area and high installation cost, which is suitable for use in areas with flat terrain. The second is the transposition method of adding branch crossarms to the special-shaped "dry" tension tower. This transposition method of adding branch crossarms to the "dry" tension tower consumes a large amount of tower material and has a high production cost, which is suitable for use in areas with restricted power corridors. Summary of the invention

[0004] The present invention provides a 750 kV single-circuit full-cycle transposition tower, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of the existing single-circuit transposition method, such as large tower base footprint, high installation cost and large tower material steel consumption.

[0005] The technical solution of the present invention is achieved through the following measures: a 750 kV single-circuit full-cycle transposition tower, comprising a tower body, a conductor crossarm and a ground wire bracket; a conductor crossarm is fixedly installed on the top of the tower body, a ground wire bracket is fixedly installed on the top of the conductor crossarm, a left jumper frame extending forward is fixedly installed on the top left of the ground wire bracket, a right jumper frame extending backward is fixedly installed on the top right of the ground wire bracket, a left jumper bracket extending backward and capable of transposition is fixedly installed on the left end of the conductor crossarm, and a right jumper bracket extending backward and capable of transposition is fixedly installed on the middle of the conductor crossarm.

[0006] The following are further optimizations and / or improvements to the above technical solutions: The left front tension string and the left rear tension string are fixedly installed on the left front and rear sides of the conductor crossarm respectively, the middle front tension string and the middle rear tension string are fixedly installed on the middle front and rear sides of the conductor crossarm respectively, and the right front tension string and the right rear tension string are fixedly installed on the right end front and rear sides of the conductor crossarm respectively; the right upper rear jumper string is fixedly installed at the rear end of the right jumper rack, and the C phase conductor is fixedly connected between the upper right rear jumper string and the left rear tension string, the left lower front jumper string is fixedly installed on the left end front side of the conductor crossarm, and the A phase conductor is fixedly connected between the left front tension string and the left lower front jumper string, and the left lower rear jumper string is fixedly installed at the rear end of the left jumper bracket. A squirrel-cage jumper is fixedly connected, and the A-phase conductor is fixedly connected between the lower left rear jumper string and the middle rear tension string; the upper left front jumper string is fixedly installed at the front end of the left jumper rack, a squirrel-cage jumper is fixedly connected between the upper left front jumper string and the upper right rear jumper string, and the C-phase conductor is fixedly connected between the upper left front jumper string and the right front tension string; the lower right rear jumper string is fixedly installed at the rear end of the right jumper bracket, and the B-phase conductor is fixedly connected between the right rear tension string and the lower right rear jumper string; the lower right front jumper string is fixedly installed on the middle front side of the conductor crossarm, a squirrel-cage jumper is fixedly connected between the lower right rear jumper string and the lower right front jumper string, and the B-phase conductor is fixedly connected between the lower right front jumper string and the middle front tension string.

[0007] A curved arm is fixedly installed between the tower body and the conductor cross arm.

[0008] The above-mentioned curved arm includes an upper curved arm and a lower curved arm, the upper end of the upper curved arm and the bottom end of the conductor cross arm are fixedly installed together, the lower end of the upper curved arm and the upper end of the lower curved arm are fixedly connected together, and the lower end of the lower curved arm and the upper end of the tower body are fixedly installed together.

[0009] The upper curved arm is a curved arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part, and the lower curved arm is a curved arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part.

[0010] The present invention has a reasonable and compact structure and is easy to use. Through the coordinated use of the tower body, the left jumper rack, the right jumper rack, the left jumper bracket and the right jumper bracket, the phase sequence of the three-phase conductors on the front and rear sides of the tower body is changed, and a full-cycle transposition is completed. It has the characteristics of safety, reliability and small footprint, is convenient for operation, and greatly reduces the manufacturing cost. At the same time, the electrical gap and the three-phase load imbalance both meet the design specifications and power grid operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0012] The codes in the accompanying drawings are: 1 for the tower body, 2 for the conductor crossarm, 3 for the ground wire bracket, 4 for the left jumper rack, 5 for the right jumper rack, 6 for the left jumper bracket, 7 for the right jumper bracket, 8 for the left front tension string, 9 for the left rear tension string, 10 for the middle front tension string, 11 for the middle rear tension string, 12 for the right front tension string, 13 for the right rear tension string, 14 for the upper right rear jumper string, 15 for the C phase conductor, 16 for the lower left front jumper string, 17 for the A phase conductor, 18 for the lower left rear jumper string, 19 for the squirrel cage jumper, 20 for the upper left front jumper string, 21 for the lower right rear jumper string, 22 for the B phase conductor, 23 for the lower right front jumper string, 24 for the upper curved arm, and 25 for the lower curved arm. DETAILED DESCRIPTION

[0013] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0014] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0015] The present invention will be further described below in conjunction with embodiments and drawings: As attached Figure 1 As shown, the 750 kV single-circuit full-cycle transposition tower includes a tower body 1, a conductor crossarm 2 and a ground wire support 3; a conductor crossarm 2 is fixedly installed on the top of the tower body 1, a ground wire support 3 is fixedly installed on the top of the conductor crossarm 2, a left jumper frame 4 extending forward is fixedly installed on the left top of the ground wire support 3, a right jumper frame 5 extending backward is fixedly installed on the right top of the ground wire support 3, a left jumper frame 6 extending backward and capable of transposition is fixedly installed on the left end of the conductor crossarm 2, and a right jumper frame 7 extending backward and capable of transposition is fixedly installed in the middle of the conductor crossarm 2. The tower body 1, the conductor cross arm 2 and the ground wire bracket 3 are all well-known and commonly used; thus, by using the tower body 1, the left jumper frame 4, the right jumper frame 5, the left jumper bracket 6 and the right jumper bracket 7 in coordination, the phase sequence of the three-phase conductors on the front and rear sides of the tower body 1 is changed, and a full-cycle transposition is completed, which has the characteristics of safety, reliability and small footprint, facilitates operation and greatly reduces manufacturing costs; at the same time, the electrical clearance and the three-phase load imbalance meet the design specifications and grid operation requirements.

[0016] The above 750 kV single-circuit full-cycle transposition tower can be further optimized and / or improved according to actual needs: As attached Figure 1As shown, a left front tension string 8 and a left rear tension string 9 are fixedly installed on the left front and rear sides of the conductor crossarm 2, a middle front tension string 10 and a middle rear tension string 11 are fixedly installed on the middle front and rear sides of the conductor crossarm 2, and a right front tension string 12 and a right rear tension string 13 are fixedly installed on the right front and rear sides of the conductor crossarm 2; a right upper rear jumper string 14 is fixedly installed at the rear end of the right jumper rack 5, a C phase conductor 15 is fixedly connected between the upper right rear jumper string 14 and the left rear tension string 9, a left lower front jumper string 16 is fixedly installed on the left front end of the conductor crossarm 2, an A phase conductor 17 is fixedly connected between the left front tension string 8 and the left lower front jumper string 16, a left lower rear jumper string 18 is fixedly installed at the rear end of the left jumper bracket 6, and a A squirrel cage jumper 19 is fixedly connected with an A-phase conductor 17 between the lower left rear jumper string 18 and the middle rear tension string 11; an upper left front jumper string 20 is fixedly installed at the front end of the left jumper rack 4, a squirrel cage jumper 19 is fixedly connected between the upper left front jumper string 20 and the upper right rear jumper string 14, a C-phase conductor 15 is fixedly connected between the upper left front jumper string 20 and the right front tension string 12, a lower right rear jumper string 21 is fixedly installed at the rear end of the right jumper bracket 7, a B-phase conductor 22 is fixedly connected between the right rear tension string 13 and the lower right rear jumper string 21, a lower right front jumper string 23 is fixedly installed on the middle front side of the conductor crossarm 2, a squirrel cage jumper 19 is fixedly connected between the lower right rear jumper string 21 and the lower right front jumper string 23, and a B-phase conductor 22 is fixedly connected between the lower right front jumper string 23 and the middle front tension string 10. A left front tension string 8 is fixedly installed on the left front side of the conductor cross arm 2, and a left rear tension string 9 is fixedly installed on the left rear side of the conductor cross arm 2; a middle front tension string 10 is fixedly installed on the middle front side of the conductor cross arm 2, and a middle rear tension string 11 is fixedly installed on the middle rear side of the conductor cross arm 2; a right front tension string 12 is fixedly installed on the right end front side of the conductor cross arm 2, and a right rear tension string 13 is fixedly installed on the right end rear side of the conductor cross arm 2. The left front tension string 8, the left rear tension string 9, the middle front tension string 10, the middle rear tension string 11, the right front tension string 12 and the right rear tension string 13 are all tension strings with the same structure, which are already known and used; the upper left front jumper string 20, the upper right rear jumper string 14, the lower left front jumper string 16 and the lower right rear jumper string 21 are all jumper strings with the same structure, which are already known and used; the squirrel cage jumper 19 is already known and used, and can be formed by integrating a squirrel cage support tube and a connecting wire.

[0017] As attached Figure 1 As shown, a curved arm is fixedly installed between the tower body 1 and the conductor cross arm 2.

[0018] As attached Figure 1As shown, the curved arm includes an upper curved arm 24 and a lower curved arm 25, the upper end of the upper curved arm 24 and the bottom end of the conductor cross arm 2 are fixedly mounted together, the lower end of the upper curved arm 24 and the upper end of the lower curved arm 25 are fixedly connected together, and the lower end of the lower curved arm 25 and the upper end of the tower body 1 are fixedly mounted together.

[0019] As attached Figure 1 As shown, the upper crank arm 24 is a crank arm with a larger outer diameter at the upper portion and a smaller outer diameter at the lower portion, and the lower crank arm 25 is a crank arm with a larger outer diameter at the upper portion and a smaller outer diameter at the lower portion.

[0020] Advantages of the present invention: The present invention provides a 750 kV single-circuit full-cycle transposition tower. Since the single-circuit full-cycle transposition tower completes the full-cycle transposition on one tower, it occupies a smaller area than the transposition of the main tower combined with two sub-towers in the prior art, consumes less steel than the transposition tower with a branch cross-arm "dry" tension tower. It only needs to install a jumper rack on the horizontally arranged wine glass-shaped tension tower, which has little effect on the size and load of the original iron tower. It has a simple structure, low manufacturing cost, and is conducive to construction and operation and maintenance.

[0021] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A 750 kV single-circuit full-cycle transposition tower, characterized in that It includes a tower body, a conductor crossarm and a ground wire bracket; a conductor crossarm is fixedly installed on the top of the tower body, a ground wire bracket is fixedly installed on the top of the conductor crossarm, a left jumper bracket extending forward is fixedly installed on the top left of the ground wire bracket, a right jumper bracket extending backward is fixedly installed on the top right of the ground wire bracket, a left jumper bracket extending backward and capable of being switched is fixedly installed on the left end of the conductor crossarm, and a right jumper bracket extending backward and capable of being switched is fixedly installed on the middle of the conductor crossarm.

2. The 750 kV single-circuit full-cycle transposition tower according to claim 1 is characterized in that The left front tension string and the left rear tension string are fixedly installed on the front and rear sides of the left part of the conductor crossarm respectively, the middle front tension string and the middle rear tension string are fixedly installed on the front and rear sides of the middle part of the conductor crossarm respectively, and the right front tension string and the right rear tension string are fixedly installed on the front and rear sides of the right end of the conductor crossarm respectively; the right upper rear jumper string is fixedly installed at the rear end of the right jumper rack, and the C phase conductor is fixedly connected between the upper right rear jumper string and the left rear tension string, the left lower front jumper string is fixedly installed on the front side of the left end of the conductor crossarm, and the A phase conductor is fixedly connected between the left front tension string and the left lower front jumper string, and the left lower rear jumper string is fixedly installed at the rear end of the left jumper bracket, and the left lower front jumper string is fixedly connected between the left lower front jumper string and the left lower rear jumper string. A squirrel-cage jumper is connected, and the A-phase conductor is fixedly connected between the lower left rear jumper string and the middle rear tension string; the upper left front jumper string is fixedly installed at the front end of the left jumper rack, a squirrel-cage jumper is fixedly connected between the upper left front jumper string and the upper right rear jumper string, and the C-phase conductor is fixedly connected between the upper left front jumper string and the right front tension string; the lower right rear jumper string is fixedly installed at the rear end of the right jumper bracket, and the B-phase conductor is fixedly connected between the right rear tension string and the lower right rear jumper string; the lower right front jumper string is fixedly installed on the middle front side of the conductor crossarm, a squirrel-cage jumper is fixedly connected between the lower right rear jumper string and the lower right front jumper string, and the B-phase conductor is fixedly connected between the lower right front jumper string and the middle front tension string.

3. The 750 kV single-circuit full-cycle transposition tower according to claim 1 or 2, characterized in that A curved arm is fixedly installed between the tower body and the conductor cross arm.

4. The 750 kV single-circuit full-cycle transposition tower according to claim 3 is characterized in that The curved arm comprises an upper curved arm and a lower curved arm, the upper end of the upper curved arm is fixedly mounted with the bottom end of the conductor cross arm, the lower end of the upper curved arm is fixedly connected with the upper end of the lower curved arm, and the lower end of the lower curved arm is fixedly mounted with the upper end of the tower body.

5. The 750 kV single-circuit full-cycle transposition tower according to claim 3 is characterized in that The upper crank arm is a crank arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part, and the lower crank arm is a crank arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part.

6. The 750 kV single-circuit full-cycle transposition tower according to claim 4 is characterized in that The upper crank arm is a crank arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part, and the lower crank arm is a crank arm with a larger outer diameter at the upper part and a smaller outer diameter at the lower part.

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