Overhead transmission line duplex double-hanging-point strain insulator string without string length adjustment
By using a self-adjustator and a specially designed metal arm in the dual-hook-point tension string, the automatic length adjustment of the dual-hook-point tension string is achieved, solving the problems of load imbalance and complex series adjustment, and improving the reliability and safety of the transmission line.
Patent Information
- Application Number
- CN202422206892.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing double-connected double-hanging point tensioning strings have load imbalance problems in actual applications. The design stage length adjustment calculation is complicated and there are errors, resulting in a reduction in the safety factor of the entire string and even a possible fracture accident.
A double-connected double-hanging point tension string for overhead transmission lines without long adjustment is designed. It adopts a self-regulator and a specially designed metal arm. Through the combination of special-shaped hanging plates and parallel hanging plates, the automatic length adjustment of the double-connected double-hanging point tension string is achieved to ensure load balance.
Load balancing is achieved without theoretical calculation and tool adjustment, which improves the reliability of transmission lines, reduces the operating risks of power grids, and avoids the error and complexity caused by long adjustments.
Smart Images
Figure CN222928076U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transmission line fittings, in particular to a double-link double-hanging-point strain string for overhead transmission lines that does not require adjustment of the string length. Background Art
[0002] At present, double-link double-hanging-point strain strings are widely used in transmission lines of 500 kV and above due to their high reliability. Generally, there are two hanging points horizontally arranged on the cross arm of a strain tower of a transmission line for hanging the double-link double-hanging-point strain string. When designing a transmission line, a strain tower is usually used as a corner tower, with a certain angle of rotation. In addition, the two hanging points are spaced at a certain distance, which makes the inner-angle side string length and the outer-angle side string length of an ordinary double-link strain string different. To solve this problem, during the design stage, theoretical calculations are usually carried out, in cooperation with fittings with adjustable lengths, adding, reducing or replacing the fittings inside the strain string, and designing the inner-angle side string length and the outer-angle side string length of the double-link strain string to be of different lengths. However, the actual transmission line often has undulations, and in addition, the cross arms of some towers are not of equal width, making the calculation very cumbersome and having a certain error from the actual situation. This will lead to uneven loads on the two links of the double-link double-hanging-point strain string. In severe cases, it may occur that one link bears most of the load, reducing the safety factor of the whole string and endangering the safety of the whole string. Seriously, a safety accident such as the fracture of the strain string may occur.
[0003] In view of this, in order to improve the reliability of transmission lines and ensure the safe operation of the power grid, it is necessary to conduct further research on the double-link double-hanging-point strain string of transmission lines. Summary of the Utility Model
[0004] The utility model is to solve the technical problems of uneven loads of the existing double-link double-hanging-point strain string, complicated theoretical calculations for string length adjustment and errors during the design stage, and troublesome construction. The utility model provides a double-link double-hanging-point strain string for overhead transmission lines that does not require adjustment of the string length, realizing the function of balancing the loads of the double-link double-hanging-point strain string without theoretical calculations and without adding, reducing or changing fittings.
[0005] In order to achieve the above object, the utility model adopts the following technical scheme:
[0006] Design a double-link double-hanging-point strain string for overhead transmission lines that does not require adjustment of the string length, including a fitting arm (1), a self-regulator (2) and a double-link insulator string (3), characterized in that: one end of the fitting arm (1) is connected to the 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 fitting arm (1), and the other end is connected to the double-link insulator string (3); the double-link insulator string (3) is connected to the conductor.
[0007] Furthermore, the fitting arm (1) is formed by connecting a U-shaped hanging ring, a DB adjusting plate, a parallel hanging plate and a traction plate, and two fitting 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 pole.
[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 both the horizontal direction and the vertical direction, and the outside of the hanging holes is subjected to rounding treatment.
[0010] Furthermore, a stiffening plate is arranged inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from aluminum alloy.
[0011] Furthermore, the parallel hanging plate (22) is configured with an internal hexagonal bolt, and the internal hexagonal bolt is provided with a lock washer.
[0012] A double-circuit double-hanging-point strain string for overhead transmission lines without string length adjustment proposed by the present utility model improves the reliability of the transmission line and reduces the operation risk of the power grid. The beneficial effects are as follows:
[0013] (1) The present utility model designs a self-regulator to transform the existing double-circuit double-hanging-point strain string, realizes the automatic adjustment of the string length of the double-circuit double-hanging-point strain string, and solves the problems of complicated calculation for adjusting the string length of the double-circuit double-hanging-point strain string and uneven stress even after the string length adjustment.
[0014] (2) The self-regulator in the present utility model is provided with hanging plates in both the horizontal direction and the vertical direction. The hanging plates in the horizontal direction, the cross arm and the two fitting arms will form a parallelogram. When the tower pole has a rotation angle, the parallelogram will rotate accordingly. According to the characteristics of the parallelogram, there is no need to adjust the lengths of the two fitting arms.
[0015] (3) The two special-shaped hanging plates of the present utility model are connected by parallel hanging plates, and the displacement of the special-shaped hanging plate on the tower pole side in the horizontal direction will not be transmitted to the special-shaped hanging plate on the conductor side. Therefore, the lengths of the two sets of strain strings do not need to be adjusted.
[0016] (4) The parallel hanging plate of the present utility model is configured with an internal hexagonal bolt, which is convenient for installation, and the whole string meets the requirements of double-circuit double-hanging, improving the reliability of the strain string.
[0017] In summary, the present utility model is a double-circuit double-hanging-point strain string for overhead transmission lines without string length adjustment proposed on the basis of the existing double-circuit double-hanging-point strain string. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] To more clearly illustrate the technical solution of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative work, other drawings can also be obtained based on these drawings. The drawings of the present utility model are shown as follows:
[0019] Figure 1 The top view and side view of a double - link double - suspension - point strain string for overhead transmission lines without string - length adjustment proposed by the present utility model;
[0020] Figure 2 The structural diagram of the self - adjuster in a double - link double - suspension - point strain string for overhead transmission lines without string - length adjustment proposed by the present utility model;
[0021] Figure 3 The top view of a double - link double - suspension - point strain string for overhead transmission lines without string - length adjustment proposed by the present utility model in Embodiment 1;
[0022] Figure 4 The top view of a double - link double - suspension - point strain string for overhead transmission lines without string - length adjustment proposed by the present utility model in Embodiment 2.
[0023] In the figure: 1 - fitting arm, 2 - self - adjuster, 3 - double - link insulator string, 21 - special - shaped hanger plate, 22 - parallel hanger plate. Detailed implementation manners
[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.
[0025] Embodiment 1: Refer to Figure 1 and Figure 2 , a double - link double - suspension - point strain string for overhead transmission lines without string - length adjustment, including a fitting arm (1), a self - adjuster (2) and a double - link insulator string (3); one end of the fitting arm (1) is connected to the tower suspension point, and the other end is connected to the self - adjuster (2); one end of the self - adjuster (2) is connected to the fitting arm (1), and the other end is connected to the double - link insulator string (3); the double - link insulator string (3) is connected to the conductor.
[0026] Furthermore, the fitting arm (1) is formed by connecting a U - shaped hanging ring, a DB adjusting plate, a parallel hanger plate and a traction plate, and two fitting arms (1) are provided, which are respectively connected to the inner - angle side suspension point and the outer - angle side suspension point of the tower.
[0027] Further, the self-regulator (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).
[0028] Further, two hanging holes are provided in both the horizontal and vertical directions of the special-shaped hanging plate (21), and the outer parts of the hanging holes are rounded.
[0029] Further, a stiffening plate is provided inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from aluminum alloy.
[0030] Further, the parallel hanging plate (22) is configured with an internal hexagonal bolt, and the internal hexagonal bolt is provided with a lock washer.
[0031] Specifically, the rotation angle of one of the towers of the 500 kV transmission line is 60 degrees, a 160 kN double-link double-hanging-point strain string is adopted, the distance between the two hanging points of the tower is 0.6 m, and when the cross arms of the tower are of equal width, through theoretical calculation, the adjustment values of the string lengths on the inner angle side and the outer angle side of the ordinary double-link double-hanging-point are 0.3 m. At this time, it is necessary to adjust the string length by adding, reducing or changing the fittings, but due to the limitation of the fitting specifications, precise and stepless adjustment cannot be achieved, which will lead to uneven loads on the two links of the double-link double-hanging-point strain string. In severe cases, one link may bear most of the load, reducing the safety factor of the whole string and endangering the safety of the whole string.
[0032] When the present utility model is adopted, the two fitting arms (1) can be directly hung on the two hanging points of the tower, without theoretical calculation and without adding or reducing fittings. The hanging plate in the horizontal direction of the special-shaped hanging plate (21), the cross arm and the two fitting arms form a parallelogram. When the tower has a rotation angle, the parallelogram will rotate accordingly, but the lengths of the two fitting arms will not change. The two special-shaped hanging plates are connected by the 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 lengths of the two strain strings are the same. The two special-shaped hanging plates (21) are connected by the parallel hanging plates (22), 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 lengths of the two strain strings are always the same, and the loads of the two strain strings are always kept balanced, as Figure 3 shown.
[0033] Embodiment 2: Refer to Figure 1 and Figure 2 , a double-link double-hanging-point strain string for an overhead transmission line that does not require string length adjustment, including fitting arms (1), a self-regulator (2) and a double-link insulator string (3); one end of the fitting arm (1) is connected to the 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 fitting arm (1), and the other end is connected to the double-link insulator string (3); the double-link insulator string (3) is connected to the conductor.
[0034] Further, the fitting arm (1) is formed by connecting a U-shaped hanging ring, a DB adjusting plate, a parallel hanging plate and a traction plate, and two fitting arms (1) are provided, which are respectively connected to the inner-angle side hanging point and the outer-angle side hanging point of the tower.
[0035] Further, the self-adjuster (2) is composed of two special-shaped hanging plates (21) and two sets of parallel hanging plates (22).
[0036] Further, two hanging holes are provided in both the horizontal direction and the vertical direction of the special-shaped hanging plate (21), and the outer parts of the hanging holes are all rounded.
[0037] Further, stiffening plates are arranged inside the special-shaped hanging plate (21), and the special-shaped hanging plate (21) is integrally cast from aluminum alloy.
[0038] Further, the parallel hanging plate (22) is configured with internal hexagonal bolts, and the internal hexagonal bolts are provided with anti-loosening buckles.
[0039] Specifically, the rotation angle of one of the towers of the 500 kV transmission line is 90 degrees, and a 160 kN double-circuit double-hanging-point strain string is adopted. The distance between the two hanging points of the tower is 0.6 meters. When the cross arms of the tower are of equal width, through theoretical calculation, the adjustment values of the string lengths on the inner-angle side and the outer-angle side of the ordinary double-circuit double-hanging-point are about 0.4243 meters. At this time, it is necessary to adjust the string length by adding or reducing or changing the fittings, but due to the limitation of the fitting specifications, precise and stepless adjustment cannot be achieved, which will lead to unbalanced loads on the two circuits of the double-circuit double-hanging-point strain string. In serious cases, most of the loads may be borne by one circuit, reducing the safety factor of the whole string and endangering the safety of the whole string.
[0040] When the present utility model is adopted, directly hang the two fitting arms (1) on the two hanging points of the tower, without the need for theoretical calculation or adding or reducing fittings. The hanging plate in the horizontal direction of the special-shaped hanging plate (21), the cross arm and the two fitting arms will form a parallelogram. When there is a rotation angle of the tower, the parallelogram will rotate accordingly, but the lengths of the two fitting arms will not change. The two special-shaped hanging plates 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 lengths of the two strain strings are the same. The two special-shaped hanging plates (21) are connected by parallel hanging plates (22), 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 lengths of the two strain strings are always the same, and the loads of the two strain strings are always kept balanced, as Figure 4 shown.
[0041] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.
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 string length adjustment 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.