Same-side double-T-joint structure for same-tower double-loop lines

Abstract

The invention discloses a same-side double-T-connection structure of a same-tower double-loop line, and relates to the technical field of power transmission lines. In urban roads, green belts or sidewalks are limited in space, only single-loop T connection can be achieved on the same tower, and two-base terminal towers need to be arranged for double-loop T connection. The system comprises a steel tube tower, a main loop line and a T-connection loop line, the steel tube tower comprises a steel tube pole, a first cross arm group and a second cross arm group are arranged on the steel tube tower, the two groups of cross arms are arranged in a 90-degree staggered mode, three layers below the first cross arm group and the second cross arm group are wire cross arms, the wire cross arms of the first cross arm group are connected with main loop wires in double loops in a hanging mode, and the wire cross arms of the second cross arm group are connected with T-connection loop lines in a hanging mode. The wire cross arm of the second cross arm group is connected with the T-connection loop wire in a hanging mode, and double-T connection between the main loop wire and the T-connection loop wire is achieved in the mode that a jumper wire and a drainage wire are connected for drainage. The same-side double-T connection of the same-tower double-loop line is realized, the problem of insufficient corridor space is solved, the number of towers is reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission lines, and in particular to a double-T connection structure on the same side of a double-circuit line on the same tower. Background Art

[0002] At present, urban roads are narrow and line corridors are tight. Lines usually adopt a double-circuit layout, and the conductor crossarm adopts a vertical arrangement of upper, middle and lower layers, with one circuit on each side of the crossarm. When the system adopts a double-circuit T-connection solution, it is necessary to solve the problem of double Ts on the same side of the double-circuit line on the same tower in a limited space.

[0003] The usual line T-connection method is to use a terminal tower, add a hanging plate at the cross arm hanging plate, and use the supporting insulator string to guide the main circuit conductor of one side of the cross arm to the other side of the cross arm to achieve T-connection. This method can only achieve single-circuit T-connection, but not double-circuit T-connection. If double-circuit T-connection is required, another terminal tower needs to be erected. However, in urban roads, there are green belts or limited sidewalk space, and T-connection between two terminal towers cannot be achieved. In this case, the double-circuit double-T requirement must be achieved on the same tower. Summary of the invention

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions, and provide a double-T connection structure on the same side of the double-circuit line on the same tower, so as to realize double-circuit double-T on the same base tower and solve the problem of insufficient corridor space. To this end, the present invention adopts the following technical solutions.

[0005] A double-T connection structure on the same side of a double-circuit line on the same tower comprises a steel tube tower, a main circuit line and a T-connected circuit line as a branch, wherein the main circuit line comprises a main circuit ground wire and a main circuit conductor, and the T-connected circuit line comprises a T-connected circuit ground wire and a T-connected circuit conductor. The steel tube tower comprises a steel tube pole, and two groups of cross arms are arranged on the steel tube tower, namely a first cross arm group and a second cross arm group. The first cross arm group and the second cross arm group are arranged in parallel in the vertical direction, the two groups of cross arms are arranged in an alternating manner, and the angle between the two groups of cross arms is 90 degrees. The first cross arm group and the second cross arm group are both four-layer cross arms, wherein the top layer is a ground wire cross arm, and the following three layers are conductor cross arms. The conductor cross arm of the first cross arm group is connected to the main circuit conductor in the double circuit, and the conductor cross arm of the second cross arm group is connected to the T-connected circuit conductor. The double T connection between the main circuit conductor and the T-connected circuit conductor is realized by connecting and draining in a manner of jumper wires and drainage wires. By setting two groups of crossarms in a staggered arrangement with an angle of 90 degrees on the same base steel pipe pole, double T-connections on the same side of the double-circuit lines on the same tower are achieved. This not only effectively solves the problem of insufficient corridor space, but also reduces the number of poles and towers and reduces construction costs.

[0006] As a preferred technical means: all cross arms of the two groups of cross arms are arranged at equal intervals in the vertical direction. The equal spacing design simplifies the construction difficulty, improves the installation efficiency, and ensures the safe distance between the wires, avoiding electrical and mechanical interference.

[0007] As a preferred technical means: compared with the first cross arm group and the second cross arm group, the same-phase cross arm of the first cross arm group is located above the same-phase cross arm of the second cross arm group. This arrangement of the main circuit conductor and the T-connection circuit conductor makes the main circuit conductor a two-way linear tension structure from the cross arm to both sides, and the T-connection circuit conductor is a single-side tension structure. The main circuit is located above the T-connection circuit, which makes the upper part of the steel pipe pole have a better tension effect, the main circuit conductor is higher from the ground, and the safety and reliability are higher.

[0008] As a preferred technical means: each phase cross arm of the first cross arm group is connected in series with the main circuit conductor through a tension insulator string, and the cross arm is provided with a downward jumper insulator string, and each phase cross arm is connected through a jumper, and the jumper is connected to the main circuit conductors on both sides of the same end of the cross arm by hanging at the lower end of the jumper insulator string, or the main circuit conductors are connected by a drainage line; each phase cross arm of the second cross arm group is connected in series with a T-connected circuit conductor through a tension insulator string. The first cross arm group and the second cross arm group are stably and reliably connected to each other.

[0009] As a preferred technical means: the end of each phase cross arm on one side of the second cross arm group is provided with a downward jumper insulator string and a horizontal support insulator string, the T-connected loop conductor is connected to the main loop conductor after being hung on the lower end of the jumper insulator string and the outer end of the support insulator string in sequence through the jumper, and the tension clamp gun handle of each phase cross arm on the other side of the second cross arm group is inverted, and is connected upward to the T-type clamp set on the main loop conductor of the corresponding phase end through the drain wire. According to the characteristics of the conductor loop, the connection method of the jumper and the drain wire is reasonably used to connect the main loop conductor and the T-connected loop conductor, the combined use of the jumper insulator string and the support insulator string, and the inverted tension clamp gun handle and the setting of the drain wire adapt to different line layout requirements, enhance the reliability and stability of the connection, can adapt to complex power transmission requirements, and improve the flexibility and adaptability of the system.

[0010] As the preferred technical means: the vertical spacing between two adjacent cross arms is in the range of 3.4-4m. Reasonable vertical spacing ensures that there is sufficient electrical safety distance between the wires on different cross arms, reducing the risk of short circuit, discharge and other faults in the line. At the same time, it also provides construction and maintenance personnel with sufficient safe operating space, improving the safety and convenience of work.

[0011] As a preferred technical means: the upper and lower width of the root where each phase cross arm connects to the steel pipe pole is 3.5-4.5 times the upper and lower width of the outer end of the cross arm. This makes the connection between the cross arm and the steel pipe pole more stable, able to withstand greater conductor tension and external forces, improves the overall strength and stability of the cross arm, and extends the service life of the cross arm.

[0012] As a preferred technical means: multiple layers of reinforcing ribs are arranged on both sides of the root where each cross arm is connected to the steel pipe pole. The connection between the cross arm and the steel pipe pole is further strengthened. The multiple layers of reinforcing ribs can absorb and disperse more stress, improve the wind and earthquake resistance of the structure, extend the service life, and better ensure the safe operation of the transmission line under severe weather conditions and external forces.

[0013] As a preferred technical means: in each set of crossarms, the four layers of crossarms from top to bottom are arranged alternately in a long and short pattern, which further lengthens the distance between the upper and lower layers of conductors, helps reduce electromagnetic interference and mechanical interference between the conductors, and improves the stability and reliability of the power system.

[0014] Beneficial effects: The double-T connection structure on the same side of the double-circuit line on the same tower realizes the efficient and safe layout of the double-circuit transmission line in a limited corridor space, reduces the number of poles and towers, effectively adapts to the complex and restricted corridor space environment, reduces construction costs, and effectively controls the electromagnetic interference and mechanical interference between the conductors, thereby improving the stability and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front view of the steel tube tower in the present invention, that is, the first cross arm group.

[0016] Figure 2 It is a schematic diagram of the side of the steel tube tower in the present invention, that is, the front view of the second cross arm group.

[0017] Figure 3 It is a top view schematic diagram of the steel tube tower in the present invention.

[0018] Figure 4 It is a schematic diagram of the position of the reinforcing ribs in the present invention.

[0019] Figure 5 It is a 3D simulation schematic diagram of the T-junction structure in the present invention.

[0020] Figure 6 It is a schematic diagram of the T-connection structure circuit in the present invention.

[0021] Figure 7 It is a 3D simulation schematic diagram of the T-connected loop conductor being connected to the main loop conductor through a jumper in the present invention.

[0022] Figure 8It is a schematic diagram of the connection between the T-connected loop conductor and the drainage wire in the present invention.

[0023] Fig. 9 It is a schematic diagram of the connection between the jumper wire and the main circuit wire in the present invention.

[0024] In the figure: 1. Ground wire crossarm; 2. Conductor crossarm; 3. Steel pipe pole; 4. Reinforcing rib; 5. Strain insulator string; 6. Strain wire clamp; 7. T-type wire clamp; 8. Main circuit conductor; 9. T-connected circuit conductor; 10. Jumper wire; 11. Main circuit ground wire; 12. T-connected circuit ground wire; 13. Drain wire. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-3 As shown in 5-9, a double-T connection structure on the same side of a double-circuit line on the same tower includes a steel tube tower, a main circuit line and a T-connected circuit line as a branch, the main circuit line includes a main circuit ground wire 11 and a main circuit conductor 8, the T-connected circuit line includes a T-connected circuit ground wire 12 and a T-connected circuit conductor 9, the steel tube tower includes a steel tube pole 3, and two groups of cross arms are arranged on the steel tube pole 3, namely a first cross arm group and a second cross arm group, the first cross arm group and the second cross arm group are arranged in parallel in the vertical direction, the two groups of cross arms are staggered, and the angle between the two groups of cross arms is 90 degrees, the first cross arm group and the second cross arm group are both four-layer cross arms, the top layer is a ground wire cross arm 1, and the bottom three layers are conductor cross arms 2, the conductor cross arm 2 of the first cross arm group is connected to the main circuit conductor 8 in the double circuit, and the conductor cross arm 2 of the second cross arm group is connected to the T-connected circuit conductor 9, and the double T connection between the main circuit conductor 8 and the T-connected circuit conductor 9 is realized by connecting and draining the main circuit conductor 8 with the T-connected circuit conductor 9 using a jumper 10 and a drainage line 13.

[0027] In order to simplify the construction difficulty and improve the installation efficiency, all the cross arms of the two groups of cross arms are arranged at equal intervals in the vertical direction. The equal spacing design simplifies the construction difficulty and improves the installation efficiency, while ensuring the safe distance between the wires and avoiding electrical and mechanical interference.

[0028] In order to optimize the load-bearing structure of the steel tube pole 3, the same-phase crossarm of the first crossarm group is located above the same-phase crossarm of the second crossarm group compared with the second crossarm group. In this example, the ground wire crossarm 1 of the first crossarm group is located at the top of the steel tube pole 3. This arrangement of the main circuit conductor 8 and the T-connected circuit conductor makes the main circuit conductor 8 a bidirectional linear tensile structure from the crossarm to both sides, and the T-connected circuit conductor is a unilateral tensile structure. The main circuit is located above the T-connected circuit, which makes the tensile symmetry effect of the upper part of the steel tube pole 3 better, optimizes the load-bearing structure of the steel tube pole 3, improves stability, and makes the main circuit conductor 8 higher from the ground, and has higher safety and reliability.

[0029] In order to realize the connection of respective loop conductors, each phase cross arm of the first cross arm group is connected in series with the main loop conductor 8 through the tension insulator string 5, and the cross arm is provided with a downward jumper insulator string, and each phase cross arm is connected through a jumper 10, and the jumper 10 is connected to the main loop conductors 8 on both sides of the same end of the cross arm by being hung at the lower end of the jumper insulator string. In addition, in this example, the main loop conductor 8 can also be connected by a drain wire 13 instead of a wire, and when the drain wire 13 is connected, the jumper insulator string is not provided; each phase cross arm of the second cross arm group is connected in series with the T-connected loop conductor 9 through the tension insulator string 5. Stable and reliable connection of the respective conductors of the first cross arm group and the second cross arm group is realized.

[0030] In order to realize the reliable connection between the main circuit conductor 8 and the T-connection circuit conductor 9, a downward jumper insulator string and a horizontal support insulator string are provided at the end of each phase cross arm on one side of the second cross arm group. The T-connection circuit conductor 9 is connected to the main circuit conductor 8 after being hung on the lower end of the jumper insulator string and the outer end of the support insulator string in sequence through the jumper 10. The tension clamp 6 of each phase cross arm on the other side of the second cross arm group is inverted and connected to the T-type clamp 7 set on the main circuit conductor 8 of the corresponding phase end through the drain wire 13. According to the characteristics of the conductor loop, the main circuit conductor 8 and the T-connection circuit conductor 9 are connected by the connection method of the jumper 10 and the drain wire 13 in a reasonable manner. The combined use of the jumper insulator string and the support insulator string, as well as the inverted tension clamp 6 and the drain wire 13 are adapted to different line layout requirements, enhance the reliability and stability of the connection, can adapt to complex power transmission requirements, and improve the safety and adaptability of the transmission line.

[0031] In order to ensure that there is sufficient electrical safety distance between the upper and lower adjacent conductors, in this example, the vertical spacing between the upper and lower adjacent crossarms is 3.5m. A reasonable vertical spacing range ensures that there is sufficient electrical safety distance between the conductors on different crossarms, reducing the risk of short circuit, discharge and other faults in the line. At the same time, it also provides construction and maintenance personnel with sufficient safe operating space, improving the safety and convenience of work.

[0032] In order to improve the overall strength and stability of the crossarm, in this example, the upper and lower widths of the roots of each phase crossarm connected to the steel pipe rod 3 are 4 times the upper and lower widths of the outer ends of the crossarm. This makes the connection between the crossarm and the steel pipe rod 3 more stable and able to withstand greater conductor tension and external forces, thereby improving the overall strength and stability of the crossarm and extending the service life of the crossarm.

[0033] In order to further enhance the connection firmness between the cross arm and the steel pipe rod 3, as Figure 4As shown, three layers of reinforcing ribs 4 are arranged on both sides of the root where each cross arm is connected to the steel pipe pole 3. The connection firmness between the cross arm and the steel pipe pole 3 is further enhanced, and the multi-layer reinforcing ribs 4 can absorb and disperse more stress, improve the wind and earthquake resistance of the structure, extend the service life, and better ensure the safe operation of the transmission line under severe weather conditions and external forces.

[0034] In order to further lengthen the distance between the upper and lower layers of conductors, the four layers of crossarms from top to bottom in each group of crossarms are arranged alternately as long and short. This further lengthens the distance between the upper and lower layers of conductors in the same circuit, helps reduce electromagnetic interference and mechanical interference between conductors, and improves the stability and reliability of the power system.

[0035] The following specifically describes the double T-connection process on the same side of the main loop conductor 8 and the T-connection loop conductor 9 on the same tower. The top layer of the first crossarm group is the ground crossarm 1, namely crossarms A and B, and the three layers below are conductor crossarms 2, which from top to bottom are upper phase crossarms C and D, middle phase crossarms E and F, and lower phase crossarms G and H.

[0036] The top layer of the second crossarm group is the ground crossarm 1, namely crossarms a and b, and the three layers below are conductor crossarms 2, which from top to bottom are upper phase crossarms c and d, middle phase crossarms e and f, and lower phase crossarms g and h.

[0037] When connecting the upper phase crossarm c with the conductor on the upper phase crossarm C, a jumper insulator string and a supporting insulator string are used to connect the T-connected loop conductor 9 to the main loop conductor 8 using a jumper 10. A T-shaped wire clamp 7 is installed on the main loop conductor 8 for drainage. The middle phase crossarms e and E and the lower phase crossarms g and G are all connected in the same way.

[0038] When connecting the upper phase crossarm d with the conductor on the upper phase crossarm D, the handle of the tension clamp 6 of the upper phase crossarm d is turned upside down, and the T-type clamp 7 is installed on the main circuit conductor 8, and connected upward to the conductor on the crossarm D through the drainage line 13. The same applies to the middle phase crossarm f, F, and the lower phase crossarm h, H.

[0039] The present invention realizes the double T connection on the same side of the double-circuit line on the same tower, which not only effectively solves the problem of insufficient corridor space, but also reduces the number of poles and towers, reduces construction costs, and provides a strong guarantee for the safe and stable operation of the power system. It is suitable for various complex power transmission scenarios and has high application value and promotion prospects.

[0040] The double-T connection structure on the same side of a double-circuit line on the same tower shown above is a specific embodiment of the present invention, which has embodied the outstanding substantial features and significant progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the protection scope of this scheme.

Claims

1. A double-circuit line double-T connection structure on the same side of the same tower, comprising a steel pipe tower, a main circuit line and a T-connected circuit line as a branch, wherein the main circuit line comprises a main circuit ground wire and a main circuit conductor, and the T-connected circuit line comprises a T-connected circuit ground wire and a T-connected circuit conductor, characterized in that: The steel pipe tower includes a steel pipe pole, on which two groups of cross arms are arranged, namely a first cross arm group and a second cross arm group. The first cross arm group and the second cross arm group are arranged in parallel in the vertical direction, the two groups of cross arms are staggered, and the angle between the two groups of cross arms is 90 degrees. The first cross arm group and the second cross arm group are both four-layer cross arms, wherein the top layer is a ground wire cross arm, and the three layers below are conductor cross arms. The conductor cross arm of the first cross arm group is connected to the main circuit conductor in the double circuit, and the conductor cross arm of the second cross arm group is connected to the T-connected circuit conductor, and the double T connection between the main circuit conductor and the T-connected circuit conductor is realized by connecting and draining with a jumper wire and a drain wire.

2. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 1, characterized in that: All cross arms of the two groups of cross arms are arranged at equal intervals vertically.

3. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 2, characterized in that: Compared with the first cross-arm group and the second cross-arm group, the same-phase cross-arms of the first cross-arm group are located above the same-phase cross-arms of the second cross-arm group.

4. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 3, characterized in that: Each phase crossarm of the first crossarm group is connected in series with the main circuit conductor through a tension insulator string. The crossarm is provided with a downward jumper insulator string. Each phase crossarm is connected through a jumper. The jumper is connected to the main circuit conductors on both sides of the same end of the crossarm by hanging on the lower end of the jumper insulator string, or the main circuit conductors are connected by a drainage line; each phase crossarm of the second crossarm group is connected in series with a T-connected circuit conductor through a tension insulator string.

5. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 4, characterized in that: A downward jumper insulator string and a horizontal supporting insulator string are provided at the end of each phase cross arm on one side of the second cross arm group. The T-connected loop conductor is sequentially hung on the lower end of the jumper insulator string and the outer end of the supporting insulator string through a jumper and then connected to the main loop conductor. The handle of the tension clamp of each phase cross arm on the other side of the second cross arm group is inverted and connected upward to the T-type clamp arranged on the main loop conductor of the corresponding phase end through a drainage line.

6. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 5, characterized in that: The vertical spacing between two adjacent cross arms ranges from 3.4 to 4m.

7. A double-T connection structure on the same side of a double-circuit line on the same tower according to claim 6, characterized in that: The upper and lower widths of the roots of each phase cross arm connected to the steel pipe pole are 3.5-4.5 times the upper and lower widths of the outer ends of the cross arm.

8. The double-T connection structure on the same side of a double-circuit line on the same tower according to claim 7, characterized in that: Multiple layers of reinforcing ribs are arranged on both sides of the root where each cross arm is connected to the steel pipe rod.

9. The double-T connection structure on the same side of a double-circuit line on the same tower according to claim 1, characterized in that: In each set of crossarms, the four layers of crossarms from top to bottom are arranged alternately in long and short order.

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