Irradiated photovoltaic cable

Abstract

This utility model discloses an irradiated photovoltaic cable, comprising: a cable core, which is wrapped with an insulation layer made of irradiated cross-linked polyethylene material; a shielding layer wrapped around the insulation layer; a filling layer wrapped around the shielding layer; a reinforcing layer wrapped around the filling layer; and a sheath layer wrapped around the reinforcing layer, wherein the sheath layer is made of irradiated cross-linked polyolefin material and contains flame retardants and weather-resistant agents. The cable core includes a conductor and a sheath for wrapping the conductor. This utility model improves the cable's radiation resistance by irradiating and cross-linking the insulation layer and sheath layer, and by adding ultraviolet absorbers and antioxidants to the insulation layer and flame retardants and weather-resistant agents to the sheath layer. This avoids problems such as reduced insulation resistance, decreased mechanical strength, and short-circuit faults caused by long-term exposure to strong radiation, thereby extending the cable's service life.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cable technology, specifically to irradiated photovoltaic cables. Background Technology

[0002] Photovoltaic cables are key components of photovoltaic systems, used to connect solar panels, inverters, and combiner boxes. They must withstand harsh outdoor environments such as strong ultraviolet radiation, high temperatures, and wind and rain for extended periods. Especially in high-altitude and high-radiation areas, the cable insulation and sheath layers are prone to cracking and performance degradation due to radiation aging, affecting service life and system safety.

[0003] Traditional photovoltaic cables mostly use ordinary cross-linked polyethylene or polyvinyl chloride materials. Although they have a certain degree of weather resistance, under long-term strong radiation conditions, the molecular chains of the materials are prone to breakage, which leads to a decrease in insulation resistance, a decrease in mechanical strength (such as a decrease in tensile strength of more than 30%), and even short circuit faults, reducing the service life of the cable. Therefore, we need to propose irradiated photovoltaic cables. Utility Model Content

[0004] The purpose of this invention is to provide irradiated photovoltaic cables, improve the cables' radiation resistance, avoid problems such as reduced insulation resistance, decreased mechanical strength, and short-circuit faults caused by long-term exposure to strong radiation, and extend the service life, thereby solving the problems mentioned in the background art.

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

[0006] Irradiated photovoltaic cables, including:

[0007] The cable core is wrapped with an insulation layer made of irradiated cross-linked polyethylene material.

[0008] A shielding layer, which wraps around the outside of the insulating layer;

[0009] A filler layer that wraps around the outside of the shielding layer;

[0010] A reinforcing layer, which wraps around the filler layer;

[0011] The sheath layer, which wraps around the reinforcing layer, is made of irradiated cross-linked polyolefin material and contains flame retardants and weather resistant agents.

[0012] Preferably, the cable core includes a conductor and a sheath for wrapping the conductor, wherein the conductor is made of multiple strands of tin-plated copper wire twisted together.

[0013] Preferably, the thickness of the insulating layer is 0.1 to 0.3 mm, and the insulating layer contains ultraviolet absorbers and antioxidants.

[0014] Preferably, the aluminum layer in the aluminum-plastic composite strip of the shielding layer has a thickness of 0.05 to 0.08 mm, and the plastic layer is made of polyethylene material with a thickness of 0.03 to 0.05 mm.

[0015] Preferably, the filling layer is made of flame-retardant fiberglass rope.

[0016] Preferably, the reinforcing layer is an aramid fiber braided layer with a braiding density of not less than 80%.

[0017] Preferably, the flame retardant is magnesium hydroxide, and the weathering agent is a hindered amine light stabilizer.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention improves the cable's radiation resistance by subjecting the insulation layer and sheath layer to radiation cross-linking treatment, and by adding ultraviolet absorbers and antioxidants to the insulation layer and flame retardants and weather resistant agents to the sheath layer. This avoids problems such as reduced insulation resistance, decreased mechanical strength, and short-circuit faults caused by long-term exposure to strong radiation, thereby extending the cable's service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the cross-section of the present invention;

[0022] Figure 3 This is a schematic diagram of the cable core removal structure of this utility model.

[0023] In the diagram: 1. Cable core; 11. Conductor; 12. Sheath; 2. Insulation layer; 3. Shielding layer; 4. Filling layer; 5. Reinforcing layer; 6. Sheath layer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3 This utility model provides a technical solution:

[0026] The irradiated photovoltaic cable includes: a cable core 1, which is wrapped with an insulation layer 2 made of irradiated cross-linked polyethylene material; a shielding layer 3 wrapped around the insulation layer 2; a filler layer 4 wrapped around the shielding layer 3; a reinforcing layer 5 wrapped around the filler layer 4; and a sheath layer 6 wrapped around the reinforcing layer 5, which is made of irradiated cross-linked polyolefin material and contains flame retardants and weather resistant agents.

[0027] In this embodiment, the insulation layer 2 is used to insulate the cable core 1 and improve the insulation capacity of the cable. The shielding layer 3 can effectively isolate electromagnetic interference. The flame retardant material enables the cable to achieve V-0 flame retardancy. The filler layer 4 can make the cable core 1 round and improve the flame retardant performance. The reinforcing layer 5 is used to enhance the cable's resistance to mechanical impact and ensure structural stability. The sheath layer 6 is made of irradiated cross-linked polyolefin material, which has excellent weather resistance after being irradiated by electron beam (absorbed dose 100-150kGy), thus improving the weather resistance effect.

[0028] The cable core 1 includes a conductor 11 and a sheath 12 for wrapping the conductor 11. The conductor 11 is made of multiple strands of tin-plated copper wire twisted together.

[0029] In this embodiment, conductor 11 is made of multiple strands of tin-plated copper wire. The tin plating layer can prevent the copper wire in conductor 11 from oxidizing. The stranding design improves the overall flexibility of conductor 11, making it easy to construct. The diameter of a single copper wire can be 0.1 to 0.3 mm, and the stranding pitch can be 10 to 15 times the outer diameter of conductor 11, ensuring that the conductivity of conductor 11 is stable (DC resistance ≤ 5.09 Ω / km). The outer skin 12 is used to wrap conductor 11.

[0030] The thickness of the insulation layer 2 is 0.1 to 0.3 mm, and ultraviolet absorbers and antioxidants are added to the insulation layer 2;

[0031] In this embodiment, the insulating layer is made of irradiated cross-linked polyethylene material, which forms a three-dimensional network structure after being irradiated with an electron beam (absorbed dose of 80-120 kGy), thereby improving heat resistance and mechanical strength. The ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone, which can absorb ultraviolet light of 280-340 nm. The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid], which can inhibit material oxidation and extend aging life.

[0032] In the aluminum-plastic composite strip of shielding layer 3, the aluminum layer has a thickness of 0.05 to 0.08 mm, and the plastic layer is made of polyethylene material with a thickness of 0.03 to 0.05 mm.

[0033] In this embodiment, the shielding layer 3 is an aluminum-plastic composite strip longitudinally wrapped structure. The aluminum layer can be used to shield electromagnetic interference, while the plastic layer is used to enhance the adhesion with the insulating layer 2. The overlap rate is ≥20% to ensure the continuity of shielding.

[0034] Filler layer 4 is made of flame-retardant fiberglass rope;

[0035] In this embodiment, the filling layer 4 is made of flame-retardant glass fiber rope, which can make the cable core 1 round and improve the flame-retardant performance.

[0036] Reinforcing layer 5 is an aramid fiber braided layer with a braiding density of not less than 80%;

[0037] In this embodiment, the reinforcing layer 5 is an aramid fiber braided layer. The high tensile strength of aramid (≥28cN / dtex) enhances the cable's resistance to mechanical impact. The braiding density is ≥80%, ensuring structural stability. It also enables the cable to have a breaking strength ≥15kN and a tensile strength ≥12MPa, meeting the installation and use requirements of complex outdoor environments.

[0038] The flame retardant is magnesium hydroxide, and the weather resistant agent is a hindered amine light stabilizer;

[0039] In this embodiment, the sheath layer 6 is made of irradiated cross-linked polyolefin material, which has excellent weather resistance after being irradiated by electron beam (absorbed dose 100-150kGy). The added magnesium hydroxide flame retardant (1.0-2.0wt%) can improve the flame retardant rating to UL94V-0, and the hindered amine light stabilizer (0.8-1.2wt%) can capture free radicals and further enhance the radiation resistance.

[0040] Working Principle: In this invention, the insulation layer 2 is used to insulate the cable core 1, improving the cable's insulation capacity. The shielding layer 3 effectively isolates electromagnetic interference. The flame-retardant material enables the cable to achieve V-0 flame retardancy. The filler layer 4 makes the cable core 1 round and improves its flame-retardant performance. The reinforcing layer 5 enhances the cable's resistance to mechanical impact and ensures structural stability. The sheath layer 6 uses irradiated cross-linked polyolefin material, which exhibits excellent weather resistance after electron beam irradiation (absorbed dose 100-150 kGy), improving its weather resistance. Furthermore, by irradiating and cross-linking the insulation layer 2 and sheath layer 6, and by adding ultraviolet absorbers and antioxidants to the insulation layer 2 and flame retardants and weather-resistant agents to the sheath layer 6, the cable's radiation resistance is improved, avoiding problems such as reduced insulation resistance, decreased mechanical strength, and short-circuit faults caused by long-term strong radiation, thus extending its service life.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An irradiated photovoltaic cable, characterized in that, include: The cable core (1) is wrapped with an insulation layer (2) made of irradiated cross-linked polyethylene material; The shielding layer (3) is wrapped around the outside of the insulating layer (2); A filling layer (4) is wrapped around the outside of the shielding layer (3); A reinforcing layer (5) is wrapped around the outside of the filling layer (4); The sheath layer (6) is wrapped around the outside of the reinforcing layer (5). The sheath layer (6) is made of irradiated cross-linked polyolefin material and contains flame retardants and weather resistant agents.

2. The irradiated photovoltaic cable according to claim 1, characterized in that: The cable core (1) includes a conductor (11) and a sheath (12) for wrapping the conductor (11), wherein the conductor (11) is made of multiple strands of tin-plated copper wire twisted together.

3. The irradiated photovoltaic cable according to claim 1, characterized in that: The insulation layer (2) has a thickness of 0.1 to 0.3 mm, and ultraviolet absorbers and antioxidants are added to the insulation layer (2).

4. The irradiated photovoltaic cable according to claim 1, characterized in that: The aluminum layer in the aluminum-plastic composite strip of the shielding layer (3) has a thickness of 0.05 to 0.08 mm, and the plastic layer is made of polyethylene material with a thickness of 0.03 to 0.05 mm.

5. The irradiated photovoltaic cable according to claim 1, characterized in that: The filling layer (4) is made of flame-retardant glass fiber rope.

6. The irradiated photovoltaic cable according to claim 1, characterized in that: The reinforcing layer (5) is an aramid fiber braided layer with a braiding density of not less than 80%.

7. The irradiated photovoltaic cable according to claim 1, characterized in that: The flame retardant is magnesium hydroxide, and the weather resistant agent is a hindered amine light stabilizer.

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