Photovoltaic cable

Abstract

The utility model belongs to the technical field of cables, in particular to a photovoltaic cable, which comprises a cable core, the cable core is formed by twisting a plurality of aluminum alloy or copper conductors, a first insulating layer made of polyvinyl chloride is arranged on the outer layer of the cable core, a shielding layer made of aluminum foil or copper foil is arranged on the outer layer of the first insulating layer, and a second insulating layer made of aluminum foil or copper foil is arranged on the outer layer of the shielding layer. The outer layer of the shielding layer is provided with a second insulating layer made of irradiation cross-linked halogen-free low-smoke polyolefin. According to the utility model, the wire core conductors are silvered or tinned, the oxidation resistance and the conductivity are good, the high-efficiency transmission of electric energy is ensured, the double shielding layers effectively resist electromagnetic interference and maintain stable signals, and the high-temperature-resistant filling layer contains a flame retardant, a multi-layer heat-insulating flame-retardant structure and the pressure-resistant water guide layer, so that the cable can adapt to severe environments, and the potential safety hazard is reduced; and the anti-skid lines of the outer protective layer are convenient to install and use, the comprehensive performance is excellent, and the reliability and safety of a photovoltaic power generation system are greatly improved.

Description

Technical Field

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

[0002] With the rapid development of solar photovoltaic power generation technology, photovoltaic cables, as an important component connecting photovoltaic modules and inverters, directly affect the reliability and safety of photovoltaic power generation systems in terms of performance and quality.

[0003] Traditional cables often have some shortcomings. For example, the conductors of ordinary cables may not have good oxidation resistance and conductivity, and are prone to oxidation during long-term use, leading to increased resistance and affecting power transmission efficiency.

[0004] Regarding insulation, the insulation materials of ordinary cables may not simultaneously meet requirements such as high temperature resistance, low smoke, and halogen-free properties. In photovoltaic power generation systems, cables may be exposed to high-temperature environments. If the high-temperature resistance of the insulation material is insufficient, it is prone to aging and cracking, thereby reducing the insulation performance of the cable and increasing safety hazards. At the same time, the low smoke and halogen-free characteristics are also crucial for photovoltaic power generation systems, because in emergencies such as fires, low smoke and halogen-free cables can reduce the generation of harmful smoke, improving the safety of personnel evacuation and rescue.

[0005] In terms of shielding performance, traditional cables may not provide adequate shielding and cannot effectively prevent external electromagnetic interference from affecting the signal transmission of photovoltaic systems. Stable signal transmission is crucial in photovoltaic power generation systems; electromagnetic interference can lead to system malfunctions or performance degradation.

[0006] Furthermore, ordinary cables may not meet the specific requirements of photovoltaic systems in terms of high-temperature resistance, thermal insulation, flame retardancy, and pressure resistance. In photovoltaic power generation systems, cables may be exposed to sunlight, wind, rain, and other harsh environmental conditions, while also enduring certain pressures. If the cables' high-temperature resistance, thermal insulation, flame retardancy, and pressure resistance are insufficient, they are prone to damage, short circuits, and other problems, affecting the normal operation of the photovoltaic power generation system.

[0007] In summary, in order to meet the high-performance requirements of photovoltaic power generation systems for cables, it is necessary to develop a photovoltaic cable with good conductivity, insulation, shielding, high temperature resistance, thermal insulation, flame retardancy, compressive strength, and water conductivity. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this utility model provides a photovoltaic cable that solves the problems mentioned in the background section.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0012] A photovoltaic cable includes a core, which is formed by stranding several aluminum alloy or copper conductors. The core is covered by a first insulation layer of polyvinyl chloride. The first insulation layer is covered by a shielding layer of aluminum foil or copper foil. The shielding layer is covered by a second insulation layer of irradiated cross-linked halogen-free low-smoke polyolefin. A high-temperature resistant filling layer of ceramic fiber, mica tape, or high-temperature silicone is provided between the second insulation layer and the shielding layer. The second insulation layer is covered by a thermal insulation layer of aluminum silicate fiber felt. The thermal insulation layer is covered by a high-temperature barrier layer of ceramic tape. The high-temperature barrier layer is covered by a fireproof layer of flame-retardant aramid fiber. The fireproof layer is covered by a pressure-resistant layer of stainless steel sheet. The pressure-resistant layer is covered by a water-conducting layer of fluoroplastic. The water-conducting layer is covered by an outer sheath of low-smoke halogen-free polyolefin.

[0013] Furthermore, the surface of the conductor is plated with silver or tin to improve its oxidation resistance and conductivity.

[0014] Furthermore, the shielding layer adopts a double-layer structure to further enhance the shielding performance.

[0015] Furthermore, the high-temperature resistant filler layer contains a flame retardant coating to improve the flame retardant performance of the cable.

[0016] Furthermore, the outer surface of the outer sheath is provided with anti-slip texture to increase the friction of the cable during installation and use, and to prevent the cable from slipping.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a photovoltaic cable with the following advantages:

[0019] This invention features a silver- or tin-plated conductor core, providing excellent oxidation resistance and conductivity to ensure efficient power transmission. A double-layer shielding layer effectively resists electromagnetic interference and maintains signal stability. A high-temperature resistant filling layer contains flame retardants, a multi-layered heat-insulating and flame-retardant structure, and a pressure-resistant and water-conducting layer, enabling it to adapt to harsh environments and reduce safety hazards. The outer protective layer's anti-slip texture facilitates installation and use. Its superior overall performance greatly enhances the reliability and safety of the photovoltaic power generation system. Attached Figure Description

[0020] Figure 1 This is a side view of the present invention.

[0021] Figure 2This is a schematic diagram of the internal cross-sectional structure of this utility model.

[0022] In the diagram: 1. Conductor; 2. First insulation layer; 3. Shielding layer; 4. High-temperature resistant filling layer; 5. Second insulation layer; 6. Thermal insulation layer; 7. High-temperature barrier band; 8. Fireproof layer; 9. Pressure resistant layer; 10. Water-conducting layer; 11. Outer protective layer. Detailed Implementation

[0023] 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.

[0024] Example

[0025] like Figure 1-2 As shown, a photovoltaic cable according to one embodiment of the present invention includes a core, which is formed by stranding several aluminum alloy or copper conductors 1.

[0026] First insulation layer 2: Located on the outer layer of the wire core, made of polyvinyl chloride.

[0027] The second insulating layer 5 is located outside the shielding layer 3 and is made of irradiated cross-linked halogen-free low-smoke polyolefin.

[0028] Shielding layer 3: Located outside the first insulating layer 2, it is made of aluminum foil or copper foil. In some embodiments, a double-layer structure is used to enhance the shielding performance.

[0029] High-temperature resistant filling layer 4: disposed between the second insulation layer 5 and the shielding layer 3, and made of ceramic fiber, mica tape or high-temperature silicone. In some embodiments, it contains added flame retardant coating to improve the flame retardant performance of the cable.

[0030] Thermal insulation layer 6: outside the second insulation layer 5, the material is aluminum silicate fiber felt.

[0031] High-temperature barrier 7: Located on the outer layer of insulation layer 6, it is made of ceramic strip.

[0032] Fireproof layer 8: Located outside the high-temperature barrier 7, it is made of flame-retardant aramid fiber.

[0033] Compression layer 9: Outside the fireproof layer 8, the material is a thin stainless steel sheet.

[0034] Water-conducting layer 10: Located outside the pressure-resistant layer 9, it is made of fluoroplastic.

[0035] Outer sheath 11: Located outside the water-conducting layer 10, it is made of low-smoke halogen-free polyolefin. Its outer surface has anti-slip texture to increase the friction during cable installation and use and prevent slippage.

[0036] Photovoltaic cables play a crucial role in transmitting electrical energy within photovoltaic systems. The conductor core (1), made of stranded aluminum alloy or copper, conducts the energy generated by the photovoltaic modules thanks to its excellent conductivity. A first PVC insulation layer (2) ensures insulation between the conductor core and the external environment, preventing leakage. An aluminum or copper foil shielding layer (3) blocks external electromagnetic interference, ensuring stable power transmission. A double-layer shielding layer (3) further enhances shielding performance. A high-temperature resistant filling layer (4) maintains cable structural stability in high-temperature environments, and its flame retardant enhances the cable's flame retardancy. A thermal insulation layer (6), a high-temperature barrier layer (7), and a fire-resistant layer (8) sequentially block external high temperatures and fire sources, protecting the internal structure. A stainless steel sheet pressure-resistant layer (9) resists external pressure, a fluoroplastic water-conducting layer (10) prevents moisture from affecting cable performance, and a low-smoke, halogen-free polyolefin outer sheath (11) protects the entire cable. The anti-slip texture on the outer surface facilitates installation and use. Silver or tin plating on the conductor core improves oxidation resistance and conductivity. Through the synergistic effect of these structures, photovoltaic cables can safely and stably transmit electrical energy in various complex environments, ensuring the normal operation of photovoltaic systems.

[0037] like Figure 2 As shown, in some embodiments, the surface of conductor 1 is plated with silver or tin to improve its oxidation resistance and conductivity; both silver and tin are excellent conductive materials. Silver has the highest conductivity of all metals, and its atomic structure allows its outer electrons to move relatively easily under the influence of an electric field. When silver is plated on the surface of conductor 1, it is equivalent to adding a highly conductive silver layer to the outer layer of the original conductor 1. During current transmission, electrons can be conducted through the silver layer. Since the resistance of the silver layer is very small, it can effectively reduce the overall resistance and improve conductivity. Although the conductivity of tin is not as good as silver, it is still better than many metals. After tin plating, it can also provide a relatively smooth conduction path for electrons. Moreover, the tin plating layer can fill in any minor imperfections that may exist on the surface of conductor 1, making the surface of conductor 1 smoother and more even, which also facilitates electron movement and thus enhances the conductivity of conductor 1.

[0038] like Figure 2As shown, in some embodiments, the shielding layer 3 employs a double-layer structure to further enhance shielding performance. When electromagnetic radiation reaches the first shielding layer 3, a portion of the electromagnetic energy is reflected back, while the remainder is absorbed. The second shielding layer 3 can reflect and absorb the remaining electromagnetic energy that has passed through the first shielding layer 3 again. For example, assuming the first shielding layer 3 can reflect and absorb 50% of the electromagnetic interference, the remaining 50% will also be reflected and absorbed when it reaches the second shielding layer 3. After double shielding, only a very small portion of the electromagnetic interference can penetrate.

[0039] like Figure 2 As shown, in some embodiments, the high-temperature resistant filler layer 4 contains a flame retardant coating to improve the flame retardant performance of the cable; some flame retardants form a dense protective film during combustion. For example, some phosphorus-containing flame retardants generate phosphoric acid substances when heated. These substances can form a glassy protective film on the surface of the high-temperature filler layer, covering the material surface and preventing oxygen from contacting combustible gases, thereby interrupting the chain reaction of combustion.

[0040] like Figure 2 As shown, in some embodiments, the outer surface of the outer sheath 11 is provided with anti-slip textures to increase the friction of the cable during installation and use, preventing the cable from slipping; the anti-slip textures on the surface of the outer sheath 11 increase the roughness of the contact surface. When the cable is placed on a flat surface or in contact with other objects, compared with a smooth surface, the outer sheath 11 with anti-slip textures can increase the coefficient of friction, making it easier to lay.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A photovoltaic cable, comprising a conductor, characterized in that: The wire core is made of several aluminum alloy or copper conductors (1) twisted together. The outer layer of the wire core is a first insulation layer (2) of polyvinyl chloride. The outer layer of the first insulation layer (2) is a shielding layer (3) of aluminum foil or copper foil. The outer layer of the shielding layer (3) is a second insulation layer (5) of irradiated cross-linked halogen-free low-smoke polyolefin. Between the second insulation layer (5) and the shielding layer (3) is a high-temperature resistant filling layer (4) of ceramic fiber, mica tape or high-temperature silicone. The outer layer of the insulation layer (5) is provided with a thermal insulation layer (6) of aluminum silicate fiber felt, the outer layer of the thermal insulation layer (6) is provided with a high temperature barrier strip (7) of ceramic tape, the outer layer of the high temperature barrier strip (7) is provided with a fireproof layer (8) of flame-retardant aramid fiber, the outer layer of the fireproof layer (8) is provided with a pressure-resistant layer (9) of stainless steel sheet, the outer layer of the pressure-resistant layer (9) is provided with a water-conducting layer (10) of fluoroplastic, and the outer layer of the water-conducting layer (10) is provided with an outer protective layer (11) of low smoke halogen-free polyolefin.

2. A photovoltaic cable according to claim 1, characterized in that: The surface of the conductor (1) is plated with silver or tin to improve its oxidation resistance and conductivity.

3. A photovoltaic cable according to claim 1, characterized in that: The shielding layer (3) adopts a double-layer structure to further enhance the shielding performance.

4. A photovoltaic cable according to claim 1, characterized in that: The high-temperature resistant filler layer (4) contains a coating with added flame retardant to improve the flame retardant performance of the cable.

5. A photovoltaic cable according to claim 1, characterized in that: The outer surface of the outer sheath (11) is provided with anti-slip texture to increase the friction of the cable during installation and use and prevent the cable from sliding.

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