Overhead transmission line duplex double-hanging-point strain insulator string without string length adjustment

Abstract

The invention relates to the technical field of power transmission line fittings, and discloses an overhead power transmission line duplex double-hanging-point tension string without string length adjustment, which comprises a fitting arm (1), a self-regulator (2) and a duplex insulator string (3), one end of the fitting arm (1) is connected with a tower hanging point, the other end of the fitting arm (1) is connected with the self-regulator (2), one end of the self-regulator (2) is connected with the fitting arm (1), and the other end of the self-regulator (2) is connected with the duplex insulator string (3). The other end is connected with a duplex insulator string (3) which is connected with a lead. Through the arrangement of the self-regulator, automatic regulation of the string length of the duplex double-hanging-point strain string is realized, the problems that the string length regulation calculation of the duplex double-hanging-point strain string is complicated and the stress is not uniform even if the string length regulation is carried out are solved, the design process is simplified, the construction difficulty is reduced, and the construction efficiency is improved. And meanwhile, the stress condition of the duplex double-hanging-point strain insulator string is improved, the reliability of a power transmission line is improved, and the double-hanging-point strain insulator string has a wide application prospect in overhead power transmission line engineering.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line hardware, in particular to a double-connected double-hanging-point tension string for overhead power transmission lines which does not require string length adjustment. Background Art

[0002] At present, double-joint double-hanging-point tension strings are widely used in 500kV and above transmission lines due to their high reliability. Generally, the horizontal crossbar of the transmission line tension tower is equipped with two hanging points for hanging double-joint double-hanging-point tension strings. When designing transmission lines, tension towers are usually used as corner towers, and there is a certain degree of rotation. In addition, the two hanging points are separated by a certain distance, which makes the inner corner string length and the outer corner string length of ordinary double-joint tension strings different. In order to solve this problem, theoretical calculations are usually used in the design stage, with adjustable length hardware, increase or decrease or replacement of hardware in the tension string, to design the inner corner string length and the outer corner string length of the double-joint tension string to different lengths. However, actual transmission lines often have ups and downs, and the cross arms of some towers are not of equal width, which makes the calculation very cumbersome and there is a certain error from the actual situation. This will cause unbalanced loads on the two links of the double-link double-hanging-point tension string. In severe cases, one link may bear most of the load, reducing the safety factor of the entire string and endangering the safety of the entire string. In severe cases, a safety accident of the tension string breaking may occur.

[0003] In view of this, in order to improve the reliability of transmission lines and ensure the safe operation of power grids, it is necessary to conduct further research on double-connected and double-hanging-point tension strings for transmission lines. Summary of the invention

[0004] The present invention aims to solve the technical problems of unbalanced load of existing double-connected double-hanging-point tension strings, complicated theoretical calculation and error of string length adjustment in the design stage, and troublesome construction. The present invention provides a double-connected double-hanging-point tension string for overhead transmission lines that does not require string length adjustment, and realizes the function of load balancing of the double-connected double-hanging-point tension string without theoretical calculation and without adding, reducing or changing hardware.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-connected double-hanging-point tension string for an overhead power transmission line that does not require string length adjustment is designed, comprising a hardware arm (1), a self-adjuster (2) and a double-connected insulator string (3), characterized in that: one end of the hardware arm (1) is connected to the pole tower hanging point, and the other end is connected to the self-adjuster (2); one end of the self-adjuster (2) is connected to the hardware arm (1), and the other end is connected to the double-connected insulator string (3); the double-connected insulator string (3) is connected to a conductor.

[0007] Furthermore, the hardware arm (1) is formed by connecting a U-shaped hanging ring, a DB adjustment plate, a parallel hanging plate and a traction plate, and two hardware arms (1) are provided, which are respectively connected to the inner corner side hanging point and the outer corner side hanging point of the tower.

[0008] Furthermore, the self-regulator (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).

[0009] Furthermore, the special-shaped hanging plate (21) is provided with two hanging holes in the horizontal direction and the vertical direction, and the outsides of the hanging holes are rounded.

[0010] Furthermore, a stiffening plate is provided inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from an aluminum alloy.

[0011] Furthermore, the parallel hanging plate (22) is equipped with a hexagon socket bolt, and the hexagon socket bolt is provided with an anti-loosening buckle.

[0012] The invention proposes a double-connected double-hanging-point tension string for overhead power transmission lines that does not require string length adjustment, which improves the reliability of the transmission line and reduces the operation risk of the power grid. The beneficial effects are: (1) The present invention designs a self-adjusting device, which transforms the existing double-connected double-hanging-point tension string, realizes the automatic adjustment of the length of the double-connected double-hanging-point tension string, and solves the problem that the length adjustment calculation of the double-connected double-hanging-point tension string is complicated and the problem that the force is uneven even after the length adjustment; (2) The self-adjuster in the present invention is provided with hanging plates in both the horizontal and vertical directions. The hanging plates in the horizontal direction, the crossarms and the two hardware arms form a parallelogram. When the tower rotates at an angle, the parallelogram rotates accordingly. According to the characteristics of the parallelogram, there is no need to adjust the lengths of the two hardware arms. (3) The two special-shaped hanging plates of the present invention are connected by parallel hanging plates, and the horizontal displacement of the special-shaped hanging plate on the tower side will not be transmitted to the special-shaped hanging plate on the conductor side. Therefore, the length of the two-link tension string does not need to be adjusted; (4) The parallel hanging plates of the present invention are equipped with hexagon socket bolts, which are easy to install, and the entire string meets the requirements of double-linked and double-hanged, thereby improving the reliability of the tension string.

[0013] In summary, the present invention is based on the existing double-connected double-hanging-point tension strings and proposes a double-connected double-hanging-point tension string for overhead transmission lines that does not require string length adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. The drawings of the present invention are as follows: Figure 1 The top view and side view of a double-connected double-hanging-point tension string for an overhead power transmission line without string length adjustment proposed by the present invention; Figure 2 This is a structural diagram of a self-regulator in a double-connected double-hanging-point tension string of an overhead power transmission line that does not require string length adjustment, as proposed by the present invention; Figure 3 A top view of a double-connected double-hanging-point tension string for an overhead power transmission line without string length adjustment proposed by the present invention in Example 1; Figure 4 This is a top view of a double-connected double-hanging-point tension string for an overhead transmission line that does not require string length adjustment, as proposed by the present invention in Example 2.

[0015] In the figure: 1- hardware arm, 2- self-adjuster, 3- double insulator string, 21- special-shaped hanging plate, 22- parallel hanging plate. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1: See Figure 1 and Figure 2 A double-connected double-hanging-point tension string for an overhead power transmission line that does not require string length adjustment comprises a hardware arm (1), a self-regulator (2) and a double-connected insulator string (3); one end of the hardware arm (1) is connected to a pole tower hanging point, and the other end is connected to the self-regulator (2); one end of the self-regulator (2) is connected to the hardware arm (1), and the other end is connected to the double-connected insulator string (3); the double-connected insulator string (3) is connected to a conductor.

[0018] Furthermore, the hardware arm (1) is formed by connecting a U-shaped hanging ring, a DB adjustment plate, a parallel hanging plate and a traction plate, and two hardware arms (1) are provided, which are respectively connected to the inner corner side hanging point and the outer corner side hanging point of the tower.

[0019] Furthermore, the self-regulator (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).

[0020] Furthermore, the special-shaped hanging plate (21) is provided with two hanging holes in the horizontal direction and the vertical direction, and the outsides of the hanging holes are rounded.

[0021] Furthermore, a stiffening plate is arranged inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from an aluminum alloy.

[0022] Furthermore, the parallel hanging plate (22) is equipped with a hexagon socket bolt, and the hexagon socket bolt is provided with an anti-loosening buckle.

[0023] Specifically, the rotation angle of one of the pole towers of the 500kV transmission line is 60 degrees. A 160kN double-jointed double-hanging-point tension string is used. The spacing between the two hanging points of the pole tower is 0.6 meters. When the pole tower crossarms are of equal width, according to theoretical calculations, the adjustment value of the string length on the inner and outer corners of the ordinary double-jointed double-hanging-point string is 0.3 meters. At this time, it is necessary to adjust the string length by adding, reducing or changing the hardware. However, due to the limitations of the hardware specifications, accurate and stepless adjustment cannot be achieved, which will lead to unbalanced loads on the two pairs of the double-jointed double-hanging-point tension string. In severe cases, one pair may bear most of the load, reducing the safety factor of the entire string and endangering the safety of the entire string.

[0024] When the present invention is used, the two hardware arms (1) can be directly hung on the two hanging points of the pole tower. There is no need to perform theoretical calculations or increase or decrease hardware. The horizontal hanging plate, cross arm and two hardware arms of the special-shaped hanging plate (21) form a parallelogram. When the pole tower rotates, the parallelogram will rotate accordingly, but the lengths of the two hardware arms will not change. The two special-shaped hanging plates are connected by parallel hanging plates. The horizontal displacement of the special-shaped hanging plate on the pole tower side will not be transmitted to the special-shaped hanging plate on the conductor side. Therefore, the lengths of the two tension strings are always the same. The loads of the two tension strings are always kept balanced, such as Figure 3 shown.

[0025] Example 2: See Figure 1 and Figure 2 A double-connected double-hanging-point tension string for an overhead power transmission line that does not require string length adjustment comprises a hardware arm (1), a self-regulator (2) and a double-connected insulator string (3); one end of the hardware arm (1) is connected to a pole tower hanging point, and the other end is connected to the self-regulator (2); one end of the self-regulator (2) is connected to the hardware arm (1), and the other end is connected to the double-connected insulator string (3); the double-connected insulator string (3) is connected to a conductor.

[0026] Furthermore, the hardware arm (1) is formed by connecting a U-shaped hanging ring, a DB adjustment plate, a parallel hanging plate and a traction plate, and two hardware arms (1) are provided, which are respectively connected to the inner corner side hanging point and the outer corner side hanging point of the tower.

[0027] Furthermore, the self-regulator (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).

[0028] Furthermore, the special-shaped hanging plate (21) is provided with two hanging holes in the horizontal direction and the vertical direction, and the outsides of the hanging holes are rounded.

[0029] Furthermore, a stiffening plate is arranged inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from an aluminum alloy.

[0030] Furthermore, the parallel hanging plate (22) is equipped with a hexagon socket bolt, and the hexagon socket bolt is provided with an anti-loosening buckle.

[0031] Specifically, the rotation angle of one of the pole towers of the 500kV transmission line is 90 degrees. A 160kN double-jointed double-hanging-point tension string is used. The spacing between the two hanging points of the pole tower is 0.6 meters. When the pole tower crossarms are of equal width, according to theoretical calculations, the adjustment value of the string length on the inner and outer corners of the ordinary double-jointed double-hanging-point string is about 0.4243 meters. At this time, it is necessary to adjust the string length by adding, reducing or changing the hardware. However, due to the limitations of the hardware specifications, accurate and stepless adjustment cannot be achieved, which will lead to unbalanced loads on the two pairs of the double-jointed double-hanging-point tension string. In severe cases, one pair may bear most of the load, reducing the safety factor of the entire string and endangering the safety of the entire string.

[0032] When the present invention is used, the two hardware arms (1) can be directly hung on the two hanging points of the pole tower. There is no need to perform theoretical calculations or increase or decrease hardware. The horizontal hanging plate, cross arm and two hardware arms of the special-shaped hanging plate (21) will form a parallelogram. When the pole tower rotates, the parallelogram will rotate accordingly, but the lengths of the two hardware arms will not change. The two special-shaped hanging plates are connected by parallel hanging plates. The horizontal displacement of the special-shaped hanging plate on the pole tower side will not be transmitted to the special-shaped hanging plate on the conductor side. Therefore, the lengths of the two tension strings are always the same. The loads of the two tension strings are always kept balanced, such as Figure 4 shown.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-connected double-hanging-point tension string for overhead power transmission lines that does not require string length adjustment, comprising a hardware arm (1), a self-adjuster (2) and a double-connected insulator string (3), characterized in that: One end of the hardware arm (1) is connected to the pole tower hanging point, and the other end is connected to the self-regulator (2); one end of the self-regulator (2) is connected to the hardware arm (1), and the other end is connected to the double insulator string (3); the double insulator string (3) is connected to the conductor.

2. The double-connected double-hanging-point tension string for overhead power transmission lines without string length adjustment according to claim 1, characterized in that: The hardware arm (1) is formed by connecting a U-shaped hanging ring, a DB adjustment plate, a parallel hanging plate and a traction plate, and two hardware arms (1) are provided, which are respectively connected to the inner corner side hanging point and the outer corner side hanging point of the tower.

3. The double-connected double-hanging-point tension string for overhead power transmission lines without string length adjustment according to claim 1, characterized in that: The self-regulator (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).

4. The double-connected double-hanging-point tension string for overhead power transmission lines without adjusting string length according to claim 3, characterized in that: The special-shaped hanging plate (21) is provided with two hanging holes in the horizontal direction and the vertical direction, and the outsides of the hanging holes are rounded.

5. The double-connected double-hanging-point tension string for overhead power transmission lines without string length adjustment according to claim 3, characterized in that: A stiffening plate is arranged inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from an aluminum alloy.

6. The double-connected double-hanging-point tension string for overhead power transmission lines without string length adjustment according to claim 3, characterized in that: The parallel hanging plate (22) is equipped with a hexagon socket bolt, and the hexagon socket bolt is provided with an anti-loosening buckle.

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