A single circuit transposition terminal tower

Abstract

The utility model relates to a single-circuit transposition terminal tower, which is a single-circuit terminal tower structure that satisfies the mutual interchange of the middle phase and the side phase, and is suitable for the phase sequence interchange of the terminal tower near the substation frame of the AC transmission line. The tower type includes a tower body; a ground wire cross arm, located at the top of the tower body; a side phase conductor cross arm; a middle phase conductor jumper bracket, used for the jumpering of the middle phase conductor; an outer corner side jumper bracket, which is arranged on the outer corner side conductor cross arm to realize the jumpering of the side phase conductor. Compared with the conventional single-circuit transposition tower, the transposition tower avoids the repeated investment in transposition and terminal towers. At the same time, the increase in iron tower materials of the transposition tower is small, and the main increase is the jumper bracket part at the conductor cross arm, so the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of AC power transmission lines, in particular to a single-circuit transposition terminal tower. Background Art

[0002] In the transmission line, in addition to the regular triangle arrangement, the distances between the three conductors are not equal, and the three-phase impedance is unbalanced. The longer the line, the more serious this imbalance is, which will produce unbalanced voltage and current, thereby affecting the operation of the generator and wireless communication. Therefore, the "110kV~750kV Overhead Transmission Line Design Code" (GB50545-2010) stipulates that for power grids with direct neutral point grounding, transmission lines with a length of more than 100km should be transposed.

[0003] In previous projects, transposition towers often used separate transposition frames, which required large investments. Since the three-phase conductors of the substation frame are arranged horizontally, while the three-phase conductors of the general single-circuit terminal tower are arranged in a triangle, when the phase is adjusted from the general terminal tower to the substation frame, the neutral conductor and the side phase conductor will cross, resulting in insufficient electrical clearance and inability to transpose. Summary of the invention

[0004] The utility model aims to provide a single-circuit transposition terminal tower, which can solve the deficiencies in the prior art and solve the problem that the conventional transposition frame in the transmission line in the prior art has a large investment and the general single-circuit terminal tower cannot change phase.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A single-circuit transposition terminal tower, the terminal tower comprising:

[0007] The tower body is provided with conductor hanging point 2, conductor hanging point 3 and conductor hanging point 5;

[0008] A ground wire cross arm is arranged on the top of the tower body and extends to the left and right sides of the tower body with the tower body as the center;

[0009] The side phase conductor cross arm is arranged on the tower body below the ground wire cross arm, and includes an inner corner conductor cross arm and an outer corner conductor cross arm; the inner corner conductor cross arm is provided with a conductor hanging point 1 and a jumper hanging point 1; the outer corner conductor cross arm is provided with a conductor hanging point 4 and a jumper hanging point 3;

[0010] A middle-phase conductor jumper bracket is arranged at the end edge of the inner corner side of the ground wire cross arm;

[0011] And an outer corner side jumper bracket is arranged on the outer corner side conductor cross arm.

[0012] Preferably, according to the present invention, the tower body is a truss structure composed of steel.

[0013] Preferably, according to the utility model, a second jumper hanging point is provided on the middle-phase conductor jumper bracket.

[0014] Preferably, according to the utility model, the outer corner jumper bracket is perpendicular to the outer corner wire cross arm.

[0015] Preferably, according to the utility model, a jumper hanging point four is provided on the outer corner jumper bracket.

[0016] Preferably, according to the present utility model, there is a height difference between the wire hanging point two, the wire hanging point three and the wire hanging point five.

[0017] The utility model can realize the transposition function on the terminal tower by arranging a jumper bracket on the conductor cross arm and arranging conductor hanging points at different positions of the tower body, thereby eliminating the need to build a separate transposition tower frame and avoiding repeated investment in the transposition tower and the terminal tower. In addition, the increase in investment of the utility model compared with the general terminal tower is mainly in the jumper bracket part on the conductor cross arm, which has a small amount of material, so the increase in investment cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a single-circuit transposition terminal tower in the utility model.

[0019] in:

[0020] 1. Tower body, 2. Ground wire crossarm, 3-1. Inner corner conductor crossarm, 3-2. Outer corner conductor crossarm, 4. Middle phase conductor jumper bracket, 5. Outer corner jumper bracket, 6-1. Conductor hanging point one (including front and rear sides), 6-2. Conductor hanging point two, 6-3. Conductor hanging point three, 6-4. Conductor hanging point four, 6-5. Conductor hanging point five, 7-1 Jumper hanging point one, 7-2 Jumper hanging point two, 7-3 Jumper hanging point three, 7-4 Jumper hanging point four, "Phase A", "Phase B", "Phase C" represent the conductors of each phase sequence. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings:

[0022] like Figure 1 A single-circuit transposition terminal tower is shown, and the terminal tower includes: a tower body 1, a ground wire cross arm 2, a side phase conductor cross arm, a middle phase conductor cross arm, a middle phase conductor jumper bracket 4 and an outer corner side jumper bracket 5. The middle phase conductor jumper bracket 4 is used for the middle phase conductor. The outer corner side jumper bracket 5 is used for the side phase conductor. The terminal tower described in the utility model meets the structural type of a single-circuit terminal tower in which the middle phase and the side phase are interchangeable, and is suitable for the phase sequence interchange of the terminal tower near the substation frame of the AC transmission line.

[0023] Specifically, the tower body 1 is a truss structure made of steel. The tower body 1 is provided with a conductor hanging point 2 6-2, a conductor hanging point 3 6-3 and a conductor hanging point 5 6-5; there is a height difference between the conductor hanging point 2 6-2, the conductor hanging point 3 6-3 and the conductor hanging point 5 6-5. On the tower body, the height is located between the conductor cross arm and the ground wire cross arm, and a conductor hanging point is arranged at the front and rear (the conductor hanging point 2 6-2 on the front side and the conductor hanging point 3 6-3 on the rear side), wherein the conductor hanging point on the frame side is higher than the conductor hanging point on the normal side; the height is located at the lower plane of the conductor cross arm, and a conductor hanging point is arranged on the tower body frame side: the conductor hanging point 5 6-5.

[0024] The ground wire cross arm 2 is arranged on the top of the tower body 1 and extends to the left and right sides of the tower body 1 with the tower body 1 as the center.

[0025] The side phase conductor cross arm is arranged on the tower body 1 below the ground wire cross arm 2, and includes an inner corner conductor cross arm 3-1 and an outer corner conductor cross arm 3-2; the inner corner conductor cross arm 3-1 is provided with a conductor hanging point 1 6-1 and a jumper hanging point 1 7-1; the outer corner conductor cross arm 3-2 is provided with a conductor hanging point 4 6-4 and a jumper hanging point 3 7-3.

[0026] The middle-phase conductor jumper bracket 4 is arranged at the inner corner end edge of the ground wire cross arm 2; the middle-phase conductor jumper bracket 4 is provided with a jumper hanging point 2 7-2.

[0027] The outer corner jumper bracket 5 is arranged on the outer corner conductor cross arm 3-2. The outer corner jumper bracket 5 is perpendicular to the outer corner conductor cross arm 3-2, and the bracket end faces the frame side. The outer corner jumper bracket 5 is provided with a jumper hanging point 7-4.

[0028] The working principle of the above-mentioned single-circuit transposition terminal tower is:

[0029] See attached Figure 1 Before the line enters the substation, the phase sequence from left to right is left phase conductor A, middle phase conductor C, right phase conductor B, and the phase sequence from left to right of the substation structure is left phase conductor A, middle phase conductor B, right phase conductor C. In order to make the phase sequence of the line consistent with that of the substation structure, it is necessary to complete the exchange of the middle phase conductor C and the right phase conductor B on the terminal tower.

[0030] The left-side A-phase conductor is connected to the conductor hanging point 6-1 on the front side of the inner corner side conductor crossarm 3-1 through a tension insulator string and hardware, and then connected to the jumper hanging point 7-1 through a jumper insulator string and hardware, and jumps to the conductor hanging point 6-1 on the frame side. Under the condition that the discharge gap requirements of working conditions such as power frequency voltage, operating overvoltage and lightning overvoltage are met, the left-side A-phase conductor transition is completed and connected to the A-phase position of the substation frame.

[0031] The middle phase conductor C is connected to the conductor hanging point 2 6-2 on the front side of the tower body 1 through a tension insulator string and hardware, and then connected to the jumper hanging point 2 7-2 on the jumper bracket 4 through a jumper insulator string and hardware, and jumps to the conductor hanging point 3 6-3 on the rear side of the tower body 1. Under the condition that the discharge gap requirements of working conditions such as power frequency voltage, operating overvoltage and lightning overvoltage are met, the middle phase conductor C is connected to the C phase position of the substation frame after the transition is completed.

[0032] The right-side B-phase conductor is connected to the conductor hanging point four 6-4 on the front side of the outer corner side conductor crossarm 3-2 through a tension insulator string and hardware, and then connected to the jumper hanging point three 7-3 and the jumper hanging point four 7-4 on the jumper bracket 5 through a jumper insulator string and hardware, and jumps to the conductor hanging point five 6-5 on the tower body 1 frame side. Under the condition that the discharge gap requirements of working conditions such as power frequency voltage, operating overvoltage and lightning overvoltage are met, the right-side B-phase conductor transition is completed and connected to the B-phase position of the substation frame.

[0033] In summary, the phase sequence on the iron tower before phase adjustment is A, C, B from left to right, and the phase sequence connected to the substation frame is A, B, C from left to right. Due to the adjustment of the hanging point, the B phase on the conductor hanging point three 6-3 and the C phase on the conductor hanging point five 6-5 are arranged vertically, but because the height of the conductor hanging point three 6-3 is increased compared to the conductor hanging point two 6-2 (more than 1m), the distance from the conductor hanging point five 6-5 is relatively large, and the conductor clearance requirement is met after space verification. The utility model can realize the transposition function on the terminal tower by setting a jumper bracket on the conductor cross arm and setting conductor hanging points at different positions of the tower body, thereby eliminating the need to build a separate transposition tower frame and avoiding repeated investment in the transposition tower and the terminal tower. Moreover, the increase in investment of the utility model relative to the general terminal tower is mainly in the jumper bracket part on the conductor cross arm, which has a small amount of material, so the increased investment cost is low.

[0034] The above-described embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A single-circuit transposition terminal tower, characterized in that: The terminal tower includes: The tower body (1) is provided with a conductor hanging point 2 (6-2), a conductor hanging point 3 (6-3) and a conductor hanging point 5 (6-5); A ground wire cross arm (2) is arranged on the top of the tower body (1) and extends to the left and right sides of the tower body (1) with the tower body (1) as the center; A side phase conductor cross arm is arranged on the tower body (1) below the ground wire cross arm (2), and comprises an inner corner conductor cross arm (3-1) and an outer corner conductor cross arm (3-2); the inner corner conductor cross arm (3-1) is provided with a conductor hanging point 1 (6-1) and a jumper hanging point 1 (7-1); the outer corner conductor cross arm (3-2) is provided with a conductor hanging point 4 (6-4) and a jumper hanging point 3 (7-3); A middle-phase conductor jumper bracket (4) is arranged at the end edge of the inner corner side of the ground wire cross arm (2); And an outer corner side jumper bracket (5), which is arranged on the outer corner side conductor cross arm (3-2).

2. The single-circuit transposition terminal tower according to claim 1, characterized in that: The tower body (1) is a truss structure made of steel.

3. The single-circuit transposition terminal tower according to claim 1, characterized in that: The middle phase conductor jumper bracket (4) is provided with a second jumper hanging point (7-2).

4. The single-circuit transposition terminal tower according to claim 1, characterized in that: The outer corner side jumper bracket (5) is perpendicular to the outer corner side conductor cross arm (3-2).

5. The single-circuit transposition terminal tower according to claim 1, characterized in that: The outer corner jumper bracket (5) is provided with a jumper hanging point four (7-4).

6. The single-circuit transposition terminal tower according to claim 1, characterized in that: The wire hanging point two (6-2), the wire hanging point three (6-3) and the wire hanging point five (6-5) have a height difference with each other.

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