Waterproof 35KV power cable

Abstract

The utility model relates to the technical field of power cables, in particular to a waterproof 35KV power cable, which comprises a conductor, and further comprises a waterproof sealing layer which is coated outside the conductor and consists of a modified polyurethane matrix and hydrophobic modified silicon dioxide nanoparticles; the waterproof sealing layer is coated with the high-voltage insulating layer, and the high-voltage insulating layer is made of a high-performance cross-linked polyethylene material; the shielding layer is coated outside the high-voltage insulating layer, and the shielding layer comprises a metal braid layer and a metal belt layer; and the outer sheath is coated outside the shielding layer and is made of a high-density polyethylene material. Through innovative waterproof structure design and material optimization, the waterproof performance and the electrical stability of the cable in an extreme environment are remarkably improved, the defect of a traditional cable in the waterproof aspect is effectively overcome, the service life of the cable is prolonged, the maintenance cost is reduced, and the service life of the cable is prolonged. And powerful support is provided for safe operation of a power transmission system.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a waterproof 35KV power cable. Background Art

[0002] Traditional 35KV power cables have limitations in waterproof design and cannot effectively cope with dynamically changing environmental conditions. They also have limitations in waterproof performance, especially in harsh environments such as high humidity and flooding. Water easily accumulates in the inner layer of the cable, causing the insulation performance of the cable to gradually decrease, affecting the safety and efficiency of power transmission and even causing short-circuit failures. Currently, although polymer materials such as polyurethane (PU) and silicone rubber are used as the inner waterproof sealing layer, it is still difficult to completely prevent water penetration during long-term use, especially at cable joints or when the cable is damaged. Therefore, the development of a new type of waterproof cable has become an urgent need in the industry. Utility Model Content

[0003] To address the above technical issues, this utility model proposes a waterproof 35KV power cable. Through innovative composite materials and structural design, the cable's waterproof performance and overall reliability are significantly improved, maintaining stable electrical performance even in extreme environments.

[0004] The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0005] Waterproof 35KV power cable, including conductor, also includes:

[0006] A waterproof sealing layer, coated on the outside of the conductor, the waterproof sealing layer is composed of a modified polyurethane matrix and hydrophobically modified silica nanoparticles;

[0007] A high-voltage insulation layer is coated on the outside of the waterproof sealing layer, and the high-voltage insulation layer is made of a high-performance cross-linked polyethylene material;

[0008] A shielding layer, wrapped around the high-voltage insulation layer, the shielding layer comprising a metal braided layer and a metal tape layer;

[0009] The outer sheath is covered on the outside of the shielding layer and is made of high-density polyethylene material.

[0010] As a further improvement of the present invention, the waterproof sealing layer contains microcapsules, and the microcapsules encapsulate a fast-curing waterproofing agent.

[0011] As a further improvement of the present invention, mica flakes are uniformly dispersed in the high-voltage insulation layer.

[0012] As a further improvement of the present invention, the metal braided layer is woven with copper tape.

[0013] As a further improvement of the present invention, the metal strip layer is formed by spirally winding an aluminum strip.

[0014] As a further improvement of the present invention, a hygroscopic material is filled between the metal braided layer and the metal belt layer.

[0015] As a further improvement of the present invention, the hygroscopic material is silica gel particles.

[0016] As a further improvement of the present invention, UV stabilizer and antioxidant are added into the outer sheath.

[0017] As a further improvement of the present invention, the waterproof sealing layer, the high-voltage insulating layer and the outer sheath are all formed by an extrusion process.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a waterproof 35KV power cable. Through innovative waterproof structure design and material optimization, the waterproof performance and electrical stability of the cable in extreme environments are significantly improved, which effectively solves the shortcomings of traditional cables in waterproofing, extends the service life of the cable, reduces maintenance costs, and provides strong support for the safe operation of the power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 Schematic diagram of the structure of the microcapsule in the utility model;

[0023] Figure 3 It is a structural schematic diagram of the shielding layer in the utility model.

[0024] In the figure: 1. Conductor; 2. Waterproof sealing layer; 3. Microcapsule; 4. High-voltage insulation layer; 5. Mica sheet; 6. Shielding layer; 61. Metal braided layer; 62. Metal tape layer; 7. Outer sheath. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 3 As shown, the waterproof 35KV power cable includes a conductor 1, and also includes a waterproof sealing layer 2, a high-voltage insulation layer 4, a shielding layer 6 and an outer sheath 7 sequentially wrapped around the outside of the conductor 1.

[0027] The waterproof sealing layer 2 is composed of a modified polyurethane matrix and hydrophobically modified silica nanoparticles, enhancing waterproofness and mechanical strength. Furthermore, the waterproof sealing layer 2 contains microcapsules 3 encapsulating a fast-curing waterproofing agent. These microcapsules automatically release the agent when the inner layer of the cable is damaged, forming an instant waterproof barrier.

[0028] The high-voltage insulation layer 4 is made of high-performance cross-linked polyethylene (XLPE). By optimizing the cross-linking process, the cross-linking degree of the XLPE is increased, enhancing its heat resistance and mechanical strength. Micron-sized mica flakes 5 are evenly dispersed within the XLPE, leveraging their flaky structure and excellent insulation properties to further enhance the cable's insulation and arc resistance.

[0029] The shielding layer 6 comprises a metal braided layer 61 and a metal tape layer 62. The metal braided layer 61 is woven from copper tape, while the metal tape layer 62 is spirally wound from aluminum tape. This double-layer shielding design effectively improves the cable's shielding performance. A hygroscopic material, in this embodiment, silica gel particles, is filled between the double-layer shielding structure to effectively absorb and isolate moisture generated within the cable.

[0030] The outer sheath 7 is made of high-density polyethylene material, and UV stabilizers and antioxidants are added during the manufacturing process to improve the weather resistance and anti-aging performance of the outer sheath, ensuring the long-term stability of the cable in harsh environments.

[0031] The working principle and use process of this utility model:

[0032] Preparation of the inner waterproof sealing layer 2: The modified PU matrix is uniformly mixed with the hydrophobically modified SiO2 nanoparticles and microcapsules, and the inner waterproof sealing layer is formed by an extrusion process.

[0033] Coating of the high-voltage insulation layer 4: On the basis of the inner waterproof sealing layer, the optimized cross-linked polyethylene material is coated through an extrusion process to form a high-voltage insulation layer.

[0034] Manufacturing of the shielding layer 6 and the outer sheath 7: A double-layer shielding structure is formed by a metal braided layer and a metal tape layer. After being filled with a hygroscopic material, HDPE material with UV stabilizers and antioxidants added is coated on the outside of the shielding layer through an extrusion process to form an outer sheath.

[0035] Subsequent processing and testing: After the cable is cooled and shaped, it needs to undergo a series of strict quality tests, including waterproof performance test, electrical performance test, etc., to ensure that the cable meets the design standards.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A 35KV power cable for waterproofing, comprising a conductor (1), characterized in that: Also includes: A waterproof sealing layer (2) covering the outside of the conductor (1); A high-voltage insulation layer (4) is coated on the outside of the waterproof sealing layer (2), and the high-voltage insulation layer (4) is made of a high-performance cross-linked polyethylene material; A shielding layer (6) is coated on the outside of the high-voltage insulation layer (4), and the shielding layer (6) includes a metal braided layer (61) and a metal tape layer (62); The outer sheath (7) is covered on the outside of the shielding layer (6) and is made of high-density polyethylene material.

2. The waterproof 35KV power cable according to claim 1, characterized in that: The waterproof sealing layer (2) contains microcapsules (3), and the microcapsules (3) encapsulate a fast-curing waterproofing agent.

3. The waterproof 35KV power cable according to claim 1, characterized in that: Mica flakes (5) are uniformly dispersed in the high-voltage insulation layer (4).

4. The waterproof 35KV power cable according to claim 1, characterized in that: The metal braided layer (61) is braided with copper tape.

5. The waterproof 35KV power cable according to claim 1, characterized in that: The metal strip layer (62) is formed by spirally winding an aluminum strip.

6. The waterproof 35KV power cable according to claim 1, characterized in that: The space between the metal braided layer (61) and the metal belt layer (62) is filled with a hygroscopic material.

7. The waterproof 35KV power cable according to claim 6, characterized in that: The hygroscopic material is silica gel particles.

8. The waterproof 35KV power cable according to claim 1, characterized in that: The waterproof sealing layer (2), the high-voltage insulating layer (4) and the outer sheath (7) are all formed by an extrusion process.

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