Anti-deflection insulator for power transmission line

Abstract

The utility model discloses an anti-deflection insulator for a power transmission line, which comprises a core rod, an umbrella rib structure is sleeved outside the core rod, an umbrella skirt sheath is sleeved outside the umbrella rib structure, and the umbrella rib structure and the umbrella skirt sheath are the same in structure and different in size. The umbrella skirts on the umbrella skirt sheath are distributed in a manner that large umbrella skirts, small umbrella skirts, middle umbrella skirts and small umbrella skirts are sequentially distributed at intervals in the axial direction of the core rod, the umbrella ribs on the umbrella rib structure are sequentially distributed at intervals in the axial direction of the core rod, and the angle range of the downward inclination angle beta 1 of each large umbrella skirt is larger than or equal to-2 degrees and smaller than or equal to beta 1lt; 0 DEG. According to the utility model, the downward inclination angle of the large umbrella skirt of the insulator is designed to be a negative angle, so that the anti-deflection capability of the insulator is greatly improved, and meanwhile, an umbrella rib structure is additionally arranged in the umbrella skirt sheath on the basis, so that the anti-deflection capability is further improved, the tearing problem caused by deformation of the umbrella skirt can be effectively solved, and the anti-deflection performance of the umbrella skirt is improved.

Description

Technical Field

[0001] This utility model relates to the field of insulator technology, specifically to an anti-deflection insulator for power transmission lines. Background Technology

[0002] Silicone rubber composite insulators are widely used in power transmission lines due to their light weight, small size, and excellent hydrophobicity. As a crucial component of high-voltage transmission systems, the performance stability and reliability of composite insulators are vital to the safe operation of the power grid. In recent years, strong winds have increasingly highlighted the deformation and cracking problems of composite insulator skirts. This not only leads to a shortened creepage distance and distorted electric field distribution, but also further affects their electrical performance. Under the combined effects of frost and dew, localized cracks are highly susceptible to arcing, which can cause wider equipment damage and even lead to transmission system failure.

[0003] In recent years, especially in the Hexi region of Gansu, the incidence of root cracks in composite insulators has been increasing year by year. This problem has seriously threatened the safe operation of transmission lines. Therefore, the anti-bending ability of composite insulators needs to be further optimized and improved in terms of structural design. Utility Model Content

[0004] In view of the existing technical problems, this utility model provides a transmission line anti-deflection insulator to solve the problems in the prior art.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0006] A transmission line anti-deflection insulator includes a core rod, an umbrella rib structure surrounding the core rod, and an umbrella skirt sheath surrounding the umbrella rib structure. The umbrella rib structure and the umbrella skirt sheath have the same structure but different sizes. The umbrella skirts on the umbrella skirt sheath are arranged in a manner where a large umbrella skirt, a small umbrella skirt, a medium umbrella skirt, and a small umbrella skirt are sequentially spaced along the axial direction of the core rod. The umbrella ribs on the umbrella rib structure are arranged in a manner where a large umbrella rib, a small umbrella rib, a medium umbrella rib, and a small umbrella rib are sequentially spaced along the axial direction of the core rod. The large umbrella skirt is fitted onto the large umbrella rib, the small umbrella skirt is fitted onto the small umbrella rib, and the medium umbrella skirt is fitted onto the medium umbrella rib. The downward tilt angle β1 of the large umbrella skirt is in the range of -2° ≤ β1 < 0°.

[0007] Preferably, the downward tilt angle β2 of the small umbrella skirt is in the range of -1°≤β2<0°; the downward tilt angle of the middle umbrella skirt is in the range of -1°≤β3<0°.

[0008] Preferably, the upward tilt angle α1 of the large umbrella skirt is in the range of 0° < α1 ≤ 10°.

[0009] Preferably, the upward tilt angle α2 of the small umbrella skirt is in the range of 0° < α2 ≤ 5°; and the upward tilt angle α3 of the medium umbrella skirt is in the range of 0° < α3 ≤ 8°.

[0010] Preferably, the ratio of the diameter d1 of the large umbrella skirt to the diameter d2 of the small umbrella skirt is d1:d2≥1.25; the ratio of the diameter d3 of the medium umbrella skirt to the diameter d2 of the small umbrella skirt is d3:d2≥1.25; the ratio of the diameter d1 of the large umbrella skirt to the diameter d4 of the large umbrella rib is 1.4≤d1:d4≤2.0; the ratio of the diameter d2 of the small umbrella skirt to the diameter d5 of the small umbrella rib is 1.4≤d2:d5≤2.0; and the ratio of the diameter d3 of the medium umbrella skirt to the diameter d6 of the medium umbrella rib is 1.4≤d3:d6≤2.0.

[0011] Preferably, the distance between the umbrella bases of the large and small umbrella skirts, the small and medium umbrella skirts, the medium and small umbrella skirts, and the small and large umbrella skirts on the umbrella skirt cover is L1, 15mm≤L1≤25mm; the distance between the umbrella ribs of the large and small umbrella ribs, the small and medium umbrella ribs, the medium and small umbrella ribs, and the small and large umbrella ribs on the umbrella rib structure is L3, 25mm≤L3≤30mm; the diameter of the core rod is L4, 15mm≤L4≤35mm; the diameter of the umbrella skirt cover is L2, and 3mm≤L2-L4≤5mm; the diameter of the umbrella rib structure is L5, 1mm≤L5-L4≤3mm.

[0012] Preferably, the distance between two adjacent large umbrella skirts is C, 70mm≤C≤80mm, and satisfies the following condition. .

[0013] Preferably, the distance between the large umbrella skirt and the small umbrella skirt is S1, the distance between the small umbrella skirt and the medium umbrella skirt is S2, and the distance between the medium umbrella skirt and the small umbrella skirt is S3, and S2 = S3.

[0014]

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model designs the downward tilt angle of the insulator's large umbrella skirt to be a negative angle. This change can greatly improve the insulator's resistance to deflection. At the same time, on this basis, an umbrella rib structure is added inside the umbrella skirt sheath. This structure further improves the resistance to deflection and can effectively solve the tearing problem caused by umbrella skirt deformation and improve the umbrella skirt's resistance to deflection. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the umbrella rib structure;

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the umbrella skirt sheath in the middle;

[0019] Figure 4 This represents the deflection of the skirt of a typical insulator in the simulation model.

[0020] Figure 5 The deflection of the insulator skirt when the down-tilt angle of the skirt is designed to be negative in the simulation model;

[0021] Figure 6 The deflection of the insulator skirt after designing the umbrella skirt's downward tilt angle as a negative angle and adding the umbrella rib structure in the simulation model. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0024] As attached Figure 1 - Appendix Figure 3The diagram shows an anti-deflection insulator for transmission lines, comprising a core rod 1, an umbrella rib structure 2 surrounding the core rod 1, and an umbrella skirt sheath 3 surrounding the umbrella rib structure 2. The umbrella rib structure 2 and the umbrella skirt sheath 3 have the same structure but different sizes; that is, the umbrella rib structure 2 is installed inside the umbrella skirt sheath 3. The core rod 1 and the umbrella rib structure 2 are made of fiberglass, and the umbrella skirt sheath 3 is made of silicone rubber. The umbrella skirts on the umbrella skirt sheath 3 are distributed in a manner where large umbrella skirts, small umbrella skirts, medium umbrella skirts, and small umbrella skirts are sequentially spaced along the axial direction of the core rod 1, i.e., a combination of large umbrella skirts, small umbrella skirts, medium umbrella skirts, and small umbrella skirts forms a group. Multiple sets of these combinations are distributed on the umbrella skirt cover to form the umbrella skirt cover structure. The umbrella ribs on the rib structure 2 are distributed in the following order: large ribs, small ribs, medium ribs, and small ribs are distributed alternately along the axial direction of the core rod 1. That is, a combination of large ribs, small ribs, medium ribs, and small ribs is a group, and multiple sets of these combinations are distributed on the umbrella ribs to form the umbrella rib structure. The large umbrella skirt is fitted on the large umbrella rib, the small umbrella skirt is fitted on the small umbrella rib, and the medium umbrella skirt is fitted on the medium umbrella rib. The downward tilt angle β1 of the large umbrella skirt is in the range of -2° ≤ β1 < 0°, and the downward tilt angle β2 of the small umbrella skirt is in the range of -1° ≤ β2 < 0°. 0°; the downward angle of the medium umbrella skirt is -1°≤β3<0°; the upward angle α1 of the large umbrella skirt is 0°<α1≤10°; the upward angle α2 of the small umbrella skirt is 0°<α2≤5°; the upward angle α3 of the medium umbrella skirt is 0°<α3≤8°.

[0025] The ratio of the diameter d1 of the large umbrella skirt to the diameter d2 of the small umbrella skirt is d1:d2≥1.25; the ratio of the diameter d3 of the medium umbrella skirt to the diameter d2 of the small umbrella skirt is d3:d2≥1.25; the ratio of the diameter d1 of the large umbrella skirt to the diameter d4 of the large umbrella rib is 1.4≤d1:d4≤2.0; the ratio of the diameter d2 of the small umbrella skirt to the diameter d5 of the small umbrella rib is 1.4≤d2:d5≤2.0; the ratio of the diameter d3 of the medium umbrella skirt to the diameter d6 of the medium umbrella rib is 1.4≤d3:d6≤2.0.

[0026] The distance between the umbrella root on the umbrella skirt cover 3, between the large umbrella skirt and the small umbrella skirt, between the small umbrella skirt and the medium umbrella skirt, between the medium umbrella skirt and the small umbrella skirt, and between the small umbrella skirt and the large umbrella skirt, is L1, 15mm≤L1≤25mm; the distance between the umbrella root on the umbrella rib structure 2, between the large umbrella rib and the small umbrella rib, between the small umbrella rib and the medium umbrella rib, between the medium umbrella rib and the small umbrella rib, and between the small umbrella rib and the large umbrella rib, is L3, 25mm≤L3≤30mm; the diameter of the core rod 1 is L4, 15mm≤L4≤35mm; the diameter of the umbrella skirt cover 3 is L2, and 3mm≤L2-L4≤5mm; the diameter of the umbrella rib structure 2 is L5, 1mm≤L5-L4≤3mm.

[0027] The distance between two adjacent large umbrella skirts is C, 70mm≤C≤80mm, and satisfies the following conditions: .

[0028] The distance between the large umbrella skirt and the small umbrella skirt is S1, the distance between the small umbrella skirt and the medium umbrella skirt is S2, and the distance between the medium umbrella skirt and the small umbrella skirt is S3, and S2 = S3. 3，

[0029]

[0030]

[0031] Compared with existing technologies, the downward tilt angle of the large umbrella skirt of this anti-bending insulator is different from that of ordinary insulators. The downward tilt angle of ordinary insulators varies between 1° and 6°, while the downward tilt angle of the large umbrella skirt of this insulator is a negative angle. This structural change can significantly improve the insulator's anti-bending ability. In addition, a glass fiber rib structure is added inside the umbrella skirt, which further enhances the anti-bending ability and can effectively solve the tearing problem caused by umbrella skirt deformation, thereby improving the anti-bending performance of the umbrella skirt.

[0032] This paper constructs a finite element model and conducts simulation comparisons of insulators with added umbrella ribs for deflection resistance, deflection-resistant insulators, and ordinary insulators. The results show that the ordinary insulator achieves a skirt deflection of 33.7 mm at a wind speed of 40 m / s (see appendix). Figure 4 The anti-deflection insulator with a negative downslope angle has a deflection of 6.2 mm under the same influencing factors (see Appendix). Figure 5 The deformation was reduced by 81.6%, and the anti-bending ability was significantly improved. The anti-bending insulator with a negative downslope angle and added ribs showed a skirt deflection of only 0.85mm under the same influencing factors (see Appendix). Figure 6 The deformation is reduced by 97.5% compared to ordinary insulators, and the resistance to deflection is further improved. This can solve the problems of decreased electrical performance and power transmission system failure caused by the deformation and tearing of the sheds of composite insulators.

[0033] The preferred embodiments of this utility model have been described above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A transmission line anti-deflection insulator, comprising a core rod (1), characterized in that: The core rod (1) is covered with an umbrella rib structure (2), and the umbrella rib structure (2) is covered with an umbrella skirt cover (3). The umbrella rib structure (2) and the umbrella skirt cover (3) have the same structure but different sizes. The umbrella skirts on the umbrella skirt cover (3) are arranged in a way that the large umbrella skirt, small umbrella skirt, medium umbrella skirt and small umbrella skirt are arranged alternately along the axis of the core rod (1). The umbrella ribs on the umbrella rib structure (2) are arranged in a way that the large umbrella rib, small umbrella rib, medium umbrella rib and small umbrella rib are arranged alternately along the axis of the core rod (1). The large umbrella skirt is fitted on the large umbrella rib, the small umbrella skirt is fitted on the small umbrella rib, and the medium umbrella skirt is fitted on the medium umbrella rib. The downward tilt angle β1 of the large umbrella skirt is in the range of -2°≤β1<0°.

2. The anti-deflection insulator for transmission lines according to claim 1, characterized in that: The downward tilt angle β2 of the small umbrella skirt is in the range of -1°≤β2<0°; the downward tilt angle of the medium umbrella skirt is in the range of -1°≤β3<0°.

3. The anti-deflection insulator for transmission lines according to claim 1, characterized in that: The angle range of the upward tilt angle α1 of the large umbrella skirt is 0° < α1 ≤ 10°.

4. The anti-deflection insulator for transmission lines according to claim 2, characterized in that: The upward tilt angle α2 of the small umbrella skirt is in the range of 0° < α2 ≤ 5°; the upward tilt angle α3 of the medium umbrella skirt is in the range of 0° < α3 ≤ 8°.

5. The anti-deflection insulator for transmission lines according to claim 4, characterized in that: The ratio of the diameter d1 of the large umbrella skirt to the diameter d2 of the small umbrella skirt is d1:d2≥1.25; the ratio of the diameter d3 of the medium umbrella skirt to the diameter d2 of the small umbrella skirt is d3:d2≥1.25; the ratio of the diameter d1 of the large umbrella skirt to the diameter d4 of the large umbrella rib is 1.4≤d1:d4≤2.0; the ratio of the diameter d2 of the small umbrella skirt to the diameter d5 of the small umbrella rib is 1.4≤d2:d5≤2.0; the ratio of the diameter d3 of the medium umbrella skirt to the diameter d6 of the medium umbrella rib is 1.4≤d3:d6≤2.

0.

6. The anti-deflection insulator for transmission lines according to claim 5, characterized in that: The distance between the large and small umbrella skirts, the small and medium umbrella skirts, the medium and small umbrella skirts, and the small and large umbrella skirts on the umbrella skirt cover (3) is L1, 15mm≤L1≤25mm; the distance between the large and small umbrella ribs, the small and medium umbrella ribs, the medium and small umbrella ribs, and the small and large umbrella ribs on the umbrella rib structure (2) is L3, 25mm≤L3≤30mm; the diameter of the core rod (1) is L4, 15mm≤L4≤35mm; the diameter of the umbrella skirt cover (3) is L2, and 3mm≤L2-L4≤5mm; the diameter of the umbrella rib structure (2) is L5, 1mm≤L5-L4≤3mm.

7. The anti-deflection insulator for transmission lines according to claim 6, characterized in that: The distance between two adjacent large umbrella skirts is C, where 70mm ≤ C ≤ 80mm, and satisfies... .

8. The anti-deflection insulator for transmission lines according to claim 7, characterized in that: The distance between the large umbrella skirt and the small umbrella skirt is S1, the distance between the small umbrella skirt and the medium umbrella skirt is S2, and the distance between the medium umbrella skirt and the small umbrella skirt is S3, and S2 = S3.

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