Ten-bundle conductor strain insulator string suitable for ultrahigh altitude

Abstract

The utility model discloses a ten-bundle conductor tension string suitable for ultrahigh altitude, which belongs to the technical field of tension strings and comprises two groups of tension string units. The tension string unit comprises two insulator strings which are arranged in parallel at an interval; one end of the insulator string is connected with an iron tower cross arm through the hanging point side fitting, and the other end of the insulator string is connected with a lead through the lead side fitting; the wire side fitting is provided with a shielding ring assembly. The wire side fitting is also provided with a grading ring which is wound on the tension string unit. According to the ten-bundle conductor strain insulator string suitable for the ultrahigh altitude, the structure can ensure that the electromagnetic environment and the air gap of a power transmission line do not exceed the limit under the condition of the ultrahigh altitude, the ecological environment protection requirement is met, and the engineering construction, the economic development and the ecological environment protection are organically combined.

Description

Technical Field

[0001] This utility model belongs to the field of tension string technology. Specifically, it relates to a tension string for high-altitude, multi-cracked conductors. Background Technology

[0002] Overhead transmission lines are increasingly passing through ultra-high altitude areas of 2000m to 5000m, posing a severe challenge to the electromagnetic environment of these lines. Conventional combinations of 6-split and 8-split conductors can no longer meet the requirements of the electromagnetic environment.

[0003] The electromagnetic environment of AC transmission lines refers to the sum of all electromagnetic phenomena existing in a given location, mainly involving power frequency electric fields, power frequency magnetic fields, radio interference, and audible noise. In the design and construction of transmission lines, these electromagnetic environmental factors must meet environmental protection requirements, adhering to the "three simultaneous" system for environmental protection, integrating engineering construction, economic development, and ecological environmental protection, practicing the concept that "green mountains and clear waters are invaluable assets," promoting harmonious coexistence between power grid construction and the ecological environment, and comprehensively advancing the construction of a beautiful China.

[0004] Therefore, in order to ensure that the electromagnetic environment and air gap of the transmission line do not exceed the limits under ultra-high altitude conditions, it is urgent to design a new type of suspension insulator string. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings by providing a high-strength, split-type conductor tension string suitable for ultra-high altitudes. This structure ensures that the electromagnetic environment and air gap of the transmission line do not exceed limits under ultra-high altitude conditions, meeting ecological and environmental protection requirements and organically combining engineering construction, economic development, and ecological environmental protection. To achieve the above objective, this utility model provides the following technical solution:

[0006] A tension string for ultra-high altitude conductors includes two sets of tension string units; each tension string unit includes two insulator strings arranged in parallel at intervals; one end of each insulator string is connected to the crossarm of the tower via a hanging point side fitting, and the other end is connected to the conductor via a conductor side fitting; the conductor side fitting is provided with a shielding ring assembly; the conductor side fitting is also provided with an equalizing ring, which surrounds the tension string unit.

[0007] Furthermore, the conductor-side hardware includes a first U-shaped hanging ring, a first DB adjustment plate, a first right-angle hanging plate, an extension rod, a second right-angle hanging plate, a third right-angle hanging plate, a first connecting plate, a fourth right-angle hanging plate, a second connecting plate, a first parallel hanging plate, a third connecting plate, and a cup-shaped hanging plate connected in sequence; the first U-shaped hanging ring is connected to the conductor; and the cup-shaped hanging plate is connected to the insulator string.

[0008] Furthermore, the shielding ring assembly includes a high shielding ring; the high shielding ring is connected to the upper part of the second connecting plate via a connecting bracket, facing the hanging point side.

[0009] Furthermore, the shielding ring assembly also includes a low shielding ring; the low shielding ring is connected to the lower part of the second connecting plate via a connecting bracket and faces the conductor side.

[0010] Furthermore, two equalizing rings are provided, each connected to the third connecting plate via a connecting bracket; the two equalizing rings respectively surround the two insulator strings, facing the hanging point side.

[0011] Furthermore, the hanging point side hardware includes a ball head hanging ring, a fifth right-angle hanging plate, a fourth connecting plate, a second parallel hanging plate, a traction plate, a PT adjustment plate, a third parallel hanging plate, a second DB adjustment plate, a second U-shaped hanging ring, a third U-shaped hanging ring, and the hanging point hardware connected in sequence; the hanging point hardware is connected to the tower crossarm; the ball head hanging ring is connected to the insulator string.

[0012] Furthermore, the insulator string is a glass insulator or a porcelain insulator.

[0013] Furthermore, the insulator string is a composite insulator string or a disc insulator string.

[0014] Furthermore, the insulator strings are arranged along the direction of the line.

[0015] The beneficial effects of this utility model are:

[0016] This utility model discloses a tension string for a split-type conductor suitable for ultra-high altitudes. It is applicable to split-type line conductors and tension towers in ultra-high altitude areas. Moreover, this structure can ensure that the electromagnetic environment and air gap of the transmission line do not exceed the limits under ultra-high altitude conditions, meet the requirements of ecological environmental protection, and promote the harmonious coexistence of power grid construction and ecological environment. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention;

[0018] Figure 2 This is a side view of the present invention;

[0019] In the attached diagram: 1-Hanging point hardware; 2-Second U-shaped hanging ring; 23-Third U-shaped hanging ring; 3-Second DB adjustment plate; 4-Third parallel hanging plate; 5-Traction plate; 6-Second parallel hanging plate; 7-Third connecting plate; 71-Fourth connecting plate; 8-Fifth right-angle hanging plate; 9-Ball head hanging ring; 10-Insulator string; 11-Equalizing ring; 12-Bowl head hanging plate; 13-First parallel hanging plate; 14-Second connecting plate; 15-Fourth right-angle hanging plate; 17-First connecting plate; 19-First right-angle hanging plate; 191-Second right-angle hanging plate; 192-Third right-angle hanging plate; 20-First DB adjustment plate; 21-First U-shaped hanging ring; 26-Extension tie rod; 28-Short shielding ring; 32-PT adjustment plate; 35-High shielding ring. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example:

[0023] See attached Figures 1-2 This embodiment provides a tension string for ultra-high altitude conductors, comprising two sets of tension string units arranged in parallel. Each set includes two insulator strings 10, also arranged parallel to the conductor direction. One end of the insulator string 10 is connected to the conductor via conductor-side hardware, which transmits conductor tension evenly to the insulator string 10. The conductor-side hardware also features a flexible connection design, allowing the conductor to swing at a suitable angle during wind deflection or galloping, thus avoiding stress concentration. The other end of the insulator string 10 is connected to the tower crossarm via hanging-point hardware, which also transmits conductor tension evenly to the tower crossarm. The hanging-point hardware is equipped with a ball joint or U-shaped hanging ring structure to compensate for geometric deviations caused by construction errors and tower deformation. The hanging-point hardware and conductor-side hardware work together, forming a closed-loop force transmission system: conductor tension → conductor-side hardware → insulator string 10 → hanging-point hardware → tower crossarm.

[0024] The conductor-side hardware includes, in sequence, a first U-shaped hanging ring 21, a first DB adjustment plate 20, a first right-angle hanging plate 19, an extension rod 26, a second right-angle hanging plate 191, a third right-angle hanging plate 192, a first connecting plate 17, a fourth right-angle hanging plate 15, a second connecting plate 14, a first parallel hanging plate 13, a third connecting plate 7, and a bowl-shaped hanging plate 12. The connection method is well-known to those skilled in the art and will not be described in detail here. The first U-shaped hanging ring 21 connects to the conductor and can compensate for geometric deviations caused by construction errors and tower deformation. The bowl-shaped hanging plate 12 connects to the insulator string 10, and the ball-and-socket structure of the bowl-shaped hanging plate 12 allows the insulator string 10 to rotate freely within a certain angle range. The first U-shaped hanging ring 21 is flexibly connected to the conductor and can be adjusted at multiple angles to alleviate dynamic stress concentration; the first DB adjustment plate 20 has the function of tension balancing and length fine adjustment, and balances the tension difference of the double insulator string 10 through multi-hole design; the extension rod 26 can dynamically compensate for displacement and adjust for construction errors; the right-angle hanging plate group has two functions: one is to change the direction of force transmission and distribute stress, and the other is that multiple right-angle hanging plates can correct the position and eliminate installation deviations; the multiple mounting holes on the first connecting plate 17 can be matched with the connection of multiple conductors; the fourth right-angle hanging plate 15 is used to connect the second connecting plate 14, so that the second connecting plate 14 and the first connecting plate 17 are arranged perpendicularly, which facilitates the installation of the shielding ring assembly; the first parallel hanging plate 13 can ensure that the load is transmitted in a straight line and reduce lateral bending moment; the multiple mounting holes of the third connecting plate 7 can be adapted to connect the first parallel hanging plate 13 and the cup-head hanging plate 12 on the double insulator string 10.

[0025] A high shielding ring 35 and a low shielding ring 28 are installed on the second connecting plate 14. The high shielding ring 35 is connected to the upper part of the second connecting plate 14 via a connecting bracket, facing the hanging point side. The low shielding ring 28 is connected to the lower part of the second connecting plate 14 via a connecting bracket, facing the conductor side. The high shielding ring 35 and the low shielding ring 28 form a potential gradient between the conductor and the tower: conductor (highest potential) → low shielding ring 28 (intermediate potential) → high shielding ring 35 (transition potential) → tower (zero potential). This achieves a smooth electric field transition from the conductor to the tower, which is especially suitable for harsh environments such as ultra-high altitude, low air pressure, and strong radiation. It can meet the requirements of ultra-high voltage lines for electromagnetic environment and air gap.

[0026] Two equalizing rings 11 are provided, which are connected to the third connecting plate 7 through connecting brackets respectively. The two equalizing rings 11 are respectively wrapped around the two sets of tension string units. Each equalizing ring 11 is wrapped around the periphery of the two insulator strings 10 to balance the electric field distribution between the high voltage conductor and the hardware and suppress partial discharge.

[0027] The mounting hardware includes a ball-head hanging ring 9, a fifth right-angle hanging plate 8, a fourth connecting plate 71, a second parallel hanging plate 6, a traction plate 5, a PT adjusting plate 32, a third parallel hanging plate 4, a second DB adjusting plate 3, a second U-shaped hanging ring 2, a third U-shaped hanging ring 23, and a mounting hardware 1 connected in sequence. The connection method is well known to those skilled in the art and will not be described in detail here. The ball-head hanging ring 9 is connected to the insulator string 10, allowing it to rotate freely within a certain angle range. The traction plate 5, the PT adjusting plate 32, and the second DB adjusting plate 3 work together to adjust the overall length of the tension string unit. The multi-degree-of-freedom adjustment of the U-shaped hanging ring can alleviate dynamic stress concentration.

[0028] Insulator string 10 can be made of glass or porcelain, depending on the specific application. It can also be a composite insulator string or a disc insulator string. In high-altitude, low-temperature regions, composite insulator string 10 exhibits excellent low-temperature resistance (remaining elastic even at -60℃), while disc insulator string 10 uses glass insulators to avoid the risk of low-temperature brittleness. Actual selection should be based on specific engineering parameters (such as tension, pollution level, and wind speed) and economic analysis. If necessary, a hybrid configuration (such as a redundant design of composite insulators + disc insulators) should be used to maximize the effectiveness of each insulator string 10 to meet design requirements. Insulator string 10 can rotate perpendicular to the line direction but cannot rotate towards the tower in the direction of the line.

[0029] Spacers are also installed on each split conductor to fix the spacing between them, so as to prevent the conductors from whipping each other and to suppress wind vibration and secondary span oscillation.

[0030] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A tension string for use in a very high altitude double circuit conductor, characterized by: The application relates to a double-string unit for a transmission line, which comprises two sets of double-string units; the double-string unit comprises two sets of insulator strings (10) arranged in parallel at intervals; one end of the insulator string (10) is connected with a tower cross arm through a hanging point side fitting, and the other end is connected with a wire through a wire side fitting; a shielding ring assembly is arranged on the wire side fitting; a voltage equalizing ring (11) is further arranged on the wire side fitting and surrounds the double-string unit.

2. A strain conductor for extra high altitude tension insulator strings according to claim 1, characterized in that: The wire side fitting comprises a first U-shaped hanging ring (21), a first DB adjusting plate (20), a first right-angle hanging plate (19), an extended pull rod (26), a second right-angle hanging plate (191), a third right-angle hanging plate (192), a first connecting plate (17), a fourth right-angle hanging plate (15), a second connecting plate (14), a first parallel hanging plate (13), a third connecting plate (7) and a bowl head hanging plate (12) which are sequentially connected; the first U-shaped hanging ring (21) is connected with a wire; the bowl head hanging plate (12) is connected with the insulator string (10).

3. A strain conductor for extra high altitude tension insulator strings according to claim 2, characterized in that: The shielding ring assembly comprises a high shielding ring (35); the high shielding ring (35) is connected with the upper portion of the second connecting plate (14) through a connecting support and faces the hanging point side.

4. A strain conductor for extra high altitude tension insulator strings according to claim 3, characterized in that: The shielding ring assembly further comprises a low shielding ring (28); the low shielding ring (28) is connected with the lower portion of the second connecting plate (14) through a connecting support and faces the wire side.

5. A strain conductor for extra high altitude double circuit lines as claimed in claim 4, wherein: The voltage equalizing ring (11) is provided with two, which are connected with the third connecting plate (7) through connecting supports respectively; the two voltage equalizing rings (11) respectively surround the two sets of insulator strings (10) and face the hanging point side.

6. A strain conductor for extra high altitude tension insulator strings according to claim 5, characterized in that: The hanging point side fitting comprises a ball head hanging ring (9), a fifth right-angle hanging plate (8), a fourth connecting plate (71), a second parallel hanging plate (6), a traction plate (5), a PT adjusting plate (32), a third parallel hanging plate (4), a second DB adjusting plate (3), a second U-shaped hanging ring (2), a third U-shaped hanging ring (23) and a hanging point fitting (1) which are sequentially connected; the hanging point fitting (1) is connected with a tower cross arm; the ball head hanging ring (9) is connected with the insulator string (10).

7. A strain conductor for extra high altitude double circuit lines as claimed in claim 6, wherein: The insulator string (10) is a glass insulator or a porcelain insulator.

8. A strain conductor for extra high altitude double circuit lines as claimed in claim 7, wherein: The insulator string (10) is a composite insulator string (10) or a disc-shaped insulator string (10).

9. A strain conductor for extra high altitude double circuit lines as claimed in claim 8, wherein: The insulator string (10) is arranged in the line direction.

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