Anti-torsion special 26 / 35kv aluminum alloy cable

Abstract

The utility model provides a kind of anti-torsion special 26 / 35kV aluminum alloy cable, including the outer wall of cable structure is equipped with drain hole, the two sides of cable structure are provided with side strip, the outer wall of side strip is equipped with torsion reset slot.The utility model design is reasonable, by the torsion reset slot of being set in the outer wall of cable structure, after cable structure is twisted, the power of torsion is extruded and stretched to the torsion reset slot of different direction, change the space inside torsion reset slot, then torsion reset slot exerts reverse force to cable structure, so that the degree of cable structure torsion can be reduced, avoid that torsion angle is too large and causes internal structure to scatter.

Description

Technical Field

[0001] This utility model mainly relates to the field of cables, specifically to a torsion-resistant special 26 / 35kV aluminum alloy cable. Background Technology

[0002] 26 / 35kV medium and high voltage cables are widely used in urban power grid trunk lines, new energy power plants (such as wind farms and photovoltaic power stations), large industrial facilities, and rail transit power supply systems. These scenarios often involve complex mechanical stress environments, especially in wind turbine generators, mobile heavy equipment, or earthquake-prone areas, where cables need to frequently withstand dynamic torsional loads. While traditional copper core cables have excellent conductivity, they suffer from problems such as heavy weight, high cost, and insufficient fatigue resistance, making it difficult to meet the demands of modern power systems for lightweight and economic efficiency.

[0003] Aluminum alloy conductors have become an ideal replacement material for medium and high voltage cables due to their light weight (more than 30% lighter than copper cables), low cost, and strong corrosion resistance. However, existing aluminum alloy cables have significant defects in torsional resistance:

[0004] Conventional stranded aluminum alloy conductors are prone to strand loosening and local deformation under repeated torsional stress, resulting in uneven conductor resistance or even breakage.

[0005] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0006] 1. The technical problem to be solved by the utility model:

[0007] This utility model provides a torsion-resistant special 26 / 35kV aluminum alloy cable to solve the technical problems existing in the background art.

[0008] 2. Technical Solution:

[0009] To achieve the above objectives, the technical solution provided by this utility model is as follows: a torsion-resistant special 26 / 35kV aluminum alloy cable, comprising a cable structure, wherein the outer wall of the cable structure is provided with drainage holes, and side strips are provided on both sides of the cable structure, wherein the outer wall of the side strips is provided with torsion reset grooves.

[0010] The torsion reset groove is spiral-shaped, and there are two sets of torsion reset grooves, with the two torsion reset grooves rotating in opposite directions.

[0011] Furthermore, the cable structure includes a conductor layer, an insulating buffer layer, and an armor layer, wherein the outer wall of the conductor layer is provided with an insulating buffer layer, and the outer wall of the insulating buffer layer is provided with an armor layer.

[0012] Furthermore, the armor layer includes an outer armor layer, and an inner armor layer is disposed inside the outer armor layer.

[0013] Furthermore, the insulating buffer layer includes an outer shielding layer, an anti-shear isolation layer disposed inside the outer shielding layer, a main insulating layer disposed inside the anti-shear isolation layer, and an inner shielding layer disposed inside the main insulating layer.

[0014] Furthermore, the conductor layer includes a core layer, an anti-torsion layer disposed inside the core layer, and a conductive layer disposed inside the anti-torsion layer.

[0015] 3. Beneficial effects:

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0017] This invention utilizes a torsion reset groove on the outer wall of the cable structure. When the cable structure is torsioned, the torsion force compresses and stretches the torsion reset groove in different directions, changing the internal space of the torsion reset groove. Then, the torsion reset groove applies a reverse force to the cable structure, thereby reducing the degree of torsion of the cable structure and preventing the internal structure from disintegrating due to excessive torsion angle. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the orthographic structure of this utility model.

[0021] Figure label:

[0022] 1. Cable structure; 101. Outer armor layer; 102. Inner armor layer; 103. Outer shielding layer; 104. Shear isolation layer; 105. Main insulation layer; 106. Inner shielding layer; 107. Core layer; 108. Torsion layer; 109. Conductive layer; 2. Drainage hole; 3. Side strip; 4. Torsion reset groove. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" 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 according to the specific circumstances. Example

[0027] See attached document Figure 1-3 A torsion-resistant special 26 / 35kV aluminum alloy cable includes a cable structure 1, a drainage hole 2 is provided on the outer wall of the cable structure 1, and side strips 3 are provided on both sides of the cable structure 1. The outer wall of the side strips 3 is provided with a torsion reset groove 4.

[0028] The torsion reset groove 4 is set as a spiral shape, and the number of torsion reset grooves 4 is set as two sets. The two torsion reset grooves 4 rotate in opposite directions. The drainage hole 2 is mainly used to allow rainwater to be discharged through the drainage hole 2. The outermost part of the side strip 3 is set as an arc. When the cable structure 1 is twisted, the cable structure 1 drives the side strip 3 to twist. The side strip 3 drives the torsion reset grooves 4 in different directions on the outer wall to twist, so that the torsion reset grooves 4 in different positions appear.

[0029] Furthermore, the cable structure 1 includes a conductor layer, an insulating buffer layer, and an armor layer. The outer wall of the conductor layer is provided with an insulating buffer layer, and the outer wall of the insulating buffer layer is provided with an armor layer.

[0030] Furthermore, the armor layer includes an outer armor layer 101, and an inner armor layer 102 is disposed inside the outer armor layer 101.

[0031] Inner armor layer 102: 0.2mm thick 316L stainless steel strip wrapped with a 45° right-hand twist angle (overlap rate 15%), with the strip edge pre-pressed with wavy teeth.

[0032] Outer armor layer 101: 0.3mm thick 5052 aluminum alloy strip tightly wrapped with a 45° left-hand twist angle (overlap rate 50%), and stress relief microgrooves are laser-etched on the surface.

[0033] Furthermore, the insulating buffer layer includes an outer shielding layer 103, an anti-shear isolation layer 104 is provided inside the outer shielding layer 103, a main insulating layer 105 is provided inside the anti-shear isolation layer 104, and an inner shielding layer 106 is provided inside the main insulating layer 105.

[0034] The outer shielding layer 103 is mainly made of semi-conductive ethylene-vinyl acetate;

[0035] The shear isolation layer 104 is mainly made of aramid fiber woven mesh. The shear isolation layer 104 is embedded between the inner and outer shielding layers 103 in a 30° oblique weave to form a three-dimensional shear skeleton, which converts the shear stress caused by torsion into fiber tensile stress.

[0036] The main insulation layer 105 is primarily made of ultra-clean cross-linked polyethylene;

[0037] The inner shielding layer 106 is mainly made of conductive thermoplastic polyurethane.

[0038] Furthermore, the conductor layer includes a core layer 107, an anti-torsion layer 108 is disposed inside the core layer 107, and a conductive layer 109 is disposed inside the anti-torsion layer 108.

[0039] Core layer 107: 7 strands of high-strength aluminum alloy wire (tensile strength ≥230MPa) are tightly twisted together at a low pitch angle of 15° to provide axial stiffness;

[0040] Torsion-resistant layer 108: 12 strands of austenitic stainless steel wire (0.8 mm in diameter) are wound around the core layer 107 at a 35° reverse twisting angle to form a torque self-balancing system;

[0041] Conductive layer 109: Trapezoidal cross-section 6101 aluminum alloy profile is filled and covered with 25° unidirectional pitch to maximize the conductive cross-section.

[0042] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A torsion-resistant special 26 / 35kV aluminum alloy cable, characterized in that: include The cable structure has drainage holes on its outer wall and side strips on both sides, with torsion reset grooves on the outer wall of the side strips. The torsion reset groove is spiral-shaped, and there are two sets of torsion reset grooves, with the two torsion reset grooves rotating in opposite directions.

2. The torsion-resistant special 26 / 35kV aluminum alloy cable according to claim 1, characterized in that: The cable structure includes a conductor layer, an insulating buffer layer, and an armor layer. The outer wall of the conductor layer is provided with an insulating buffer layer, and the outer wall of the insulating buffer layer is provided with an armor layer.

3. The torsion-resistant special 26 / 35kV aluminum alloy cable according to claim 2, characterized in that: The armor layer includes an outer armor layer, and an inner armor layer is disposed inside the outer armor layer.

4. The torsion-resistant special 26 / 35kV aluminum alloy cable according to claim 2, characterized in that: The insulating buffer layer includes an outer shielding layer, an anti-shear isolation layer disposed inside the outer shielding layer, a main insulating layer disposed inside the anti-shear isolation layer, and an inner shielding layer disposed inside the main insulating layer.

5. A torsion-resistant special 26 / 35kV aluminum alloy cable according to claim 2, characterized in that: The conductor layer includes a core layer, an anti-torsion layer disposed inside the core layer, and a conductive layer disposed inside the anti-torsion layer.

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