Overwater photovoltaic cable

Abstract

The utility model discloses an overwater photovoltaic cable, which comprises a conductor, and is characterized in that the structure of the cable sequentially comprises the conductor, an insulating layer, a lining layer, a cooling channel, a wrapping tape and a sheath from inside to outside, and the insulating layer is an irradiation crosslinking polyolefin outer insulating layer. The cable is reasonable in structural design, and has the following beneficial effects: the insulating layer is the irradiation cross-linked polyolefin outer insulating layer, so that the combination of hydroxide and water molecules can be effectively prevented, the temperature resistance, wear resistance and flame retardance of the cable are improved, and more importantly, a water-blocking effect is achieved; and the cooling channel is arranged to cool the cable, so that the working state of the cable is good.

Description

Technical Field

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

[0002] At present, as one of the most important clean energy sources, the scale of photovoltaic power generation projects has been continuously expanding in recent years, the technology has been increasingly advanced, and the power generation cost has also been significantly reduced. A large number of cables in photovoltaic power stations need to be laid outdoors, and the environmental conditions are harsh. The cable materials should be determined according to the resistance to ultraviolet rays, ozone, drastic temperature changes and chemical erosion. The long-term use of ordinary cable materials in such an environment will cause the cable sheath to be fragile and even decompose the cable insulation layer. These situations will directly damage the cable system, and at the same time increase the risk of cable short circuit. In the medium and long term, the possibility of fire or personal injury is also higher, which greatly affects the service life of the system. Therefore, the cables used in photovoltaic systems are special cables developed for various complex situations.

[0003] With the continuous construction of ground photovoltaic projects, the problem of occupying land resources has become increasingly serious. Therefore, floating solar power projects have been vigorously developed at home and abroad, and China is currently the largest floating solar power market. Since the application environment of floating solar power projects has changed greatly compared with that of ground photovoltaic projects, if the cables of ground photovoltaic projects are still used, it will not only affect the normal power transmission and construction difficulty, but also pose potential safety hazards to the project. Therefore, there is an urgent need for a cable that can be applied to floating solar power projects to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a floating solar power cable to solve the technical problem that the cables of existing ground photovoltaic projects cannot be applied to floating solar power projects.

[0005] To achieve the above purpose, the technical solution of the utility model provides a floating solar power cable, including a conductor. The structure of the cable from the inside to the outside is successively a conductor, an insulating layer, a lining layer, a cooling channel, a tape, and a sheath. The insulating layer is an irradiated cross-linked polyolefin outer insulating layer.

[0006] Further, the conductor is a D-shaped conductor, and the conductor shape formed by splicing two D-shaped conductors is cylindrical.

[0007] Further, a layer of cast polypropylene film is overlapped and wound around the outer layer of the D-shaped conductor, and the overlapping rate range of the winding is 5% - 15%.

[0008] Further, the conductor is stranded by copper foil wire bundles, the stranding pitch is 16 - 18 mm, the fan height is 1.56 ± 0.05 mm, and the fan width is 2.42 ± 0.05 mm.

[0009] Further, the copper foil wire is made by rolling a copper round wire into a strip-shaped copper foil and then evenly winding it around the bulletproof wire. The conductor is a bunch-stranded wire composed of 62 copper foil wires with a diameter of 0.26 mm.

[0010] Further, the average thickness of the insulating layer is greater than or equal to 0.8 mm, and the thinnest point of the insulating layer is greater than 0.7 mm.

[0011] Further, the inner lining layer is a thermoplastic elastomer, and the thickness of the inner lining layer is 0.7 ± 0.15 mm.

[0012] Further, the cooling channel is a polyurethane channel, which is divided into 8 identical water channels. Water is arranged in the water channels. The thickness of the upper and lower layers of the water channels is controlled at 1.4 ± 0.10 mm, the width of each water channel is 1.2 ± 0.10 mm, and the height is 2.0 ± 0.10 mm.

[0013] Further, the tape is a double-sided aluminum-plastic composite tape, and the overlapping thickness of the tape is 10.0 ± 2.0 mm.

[0014] Further, the sheath is an irradiated cross-linked polyolefin outer sheath, and the thickness is 2.2 ± 0.15 mm.

[0015] In summary, the device structure of the present invention is reasonably designed. By using the technical solution of the present invention, the following beneficial effects are obtained: The cable of the present invention is provided with an insulating layer, which is an irradiated cross-linked polyolefin outer insulating layer, which can effectively prevent the combination of hydroxides and water molecules, not only improving the temperature resistance, abrasion resistance and flame retardant performance of the wire and cable, but more importantly, playing a water-blocking role; at the same time, a cooling channel is provided to cool the cable, so that the cable works in a good state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of the floating solar power cable of the present invention;

[0017] Description of the reference numerals: 1 - conductor; 2 - insulating layer; 3 - inner lining layer; 4 - cooling channel; 5 - tape; 6 - sheath. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0019] In the present invention, for a clearer description, the following is stated: The observer faces the attached Figure 1For observation, the front side on the left of the observer is set as the front, the rear side on the right of the observer is set as the rear, the left rear side of the observer is set as the left, the right front side of the observer is set as the right, the upper side of the observer is set as the upper, and the lower side of the observer is set as the lower. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle part", "upper side", "lower side", etc. in the text indicating the orientation or positional relationship are the orientation or positional relationship set based on the attached drawings, and are only for the convenience of clearly describing the present utility model, rather than indicating or implying that the indicated structure or component parts must have a specific orientation and be constructed in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", "fourth" are only used for the purpose of clear or simplified description, and cannot be construed as indicating or implying relative importance or quantity.

[0020] See Figure 1 , the present utility model provides a floating photovoltaic cable, including a conductor 1. The structure of the cable of the present utility model from the inside to the outside is successively a conductor 1, an insulating layer 2, a lining layer 3, a cooling channel 4, a tape 5, and a sheath 6. The insulating layer 2 is an irradiated cross-linked polyolefin outer insulating layer.

[0021] The insulating material adopts an irradiated cross-linked polyolefin outer insulating layer. The irradiated cross-linked polyolefin outer insulating material is a low-smoke, halogen-free, flame-retardant and fire-resistant wire and cable insulating material. It is a new type of low-smoke, halogen-free material. The high-energy electron beam generated by an electron accelerator is used to irradiate and cross-link the cable, so that the insulating layer of the cable changes from a linear molecular structure to a three-dimensional network structure, forming a three-dimensional lattice smaller than water molecules, and forming a dense layer on the surface and inside of the polyethylene, thereby effectively preventing the combination of hydroxides and water molecules. This cross-linking method not only improves the temperature resistance, abrasion resistance and flame-retardant performance of the wire and cable, but more importantly, plays a water-blocking role.

[0022] As a preferred embodiment of the present utility model, the conductor 1 is a D-shaped conductor, and the shape of the conductor 1 formed by splicing two D-shaped conductors is cylindrical; a layer of cast polypropylene film is overlapped and wound around the outer layer of the D-shaped conductor, and the overlapping rate range of the winding is 5% - 15%; the conductor 1 is stranded with copper foil wire bundles, the stranding pitch is 16 - 18 mm, the fan height is 1.56 ± 0.05 mm, and the fan width is 2.42 ± 0.05 mm; after the copper foil wire is rolled from a copper round wire into a strip-shaped copper foil, it is then evenly wound around the bulletproof wire to be made, and the conductor adopts 62 copper foil wires with a diameter of 0.26 mm stranded.

[0023] The conductor is composed of 62 copper foil wires with a diameter of 0.26 mm, which are stranded in a bunch. The stranding pitch is 16 - 18 mm, the fan height is 1.56 ± 0.05 mm, and the fan width is 2.42 ± 0.05 mm. This setting enables the resistance of the cable in a 20°C direct current to be ≤ 2.04 Ω / km. To ensure the structural stability of the D-shaped conductor, a layer of cast polypropylene film (CPP tape) is overlapped and wound around its outer layer, and the winding overlap rate is controlled between 5% and 15%.

[0024] The copper foil wire is made by rolling copper round wire into strip-shaped copper foil and then evenly winding it around bulletproof wire. The bulletproof wire can make the whole cable have good tensile strength and flexibility. During stranding, the wire release tension of the copper foil wire is stably controlled by a tension regulator to avoid the bulletproof wire in the copper foil wire being stretched and stressed, which may cause the conductor to shrink after insulation extrusion and result in the bending of the wire core. The stranded conductor is pressed into a D shape by a special pressing wheel, which can greatly reduce the outer diameter of the insulated wire core after stranding and twisting into a cable, thereby reducing the overall weight.

[0025] Specifically, the average thickness of the insulating layer 2 is greater than or equal to 0.8 mm, and the thinnest point of the insulating layer 2 is greater than 0.7 mm.

[0026] Preferably, the thinnest point of the insulating layer 2 is greater than 0.72 mm.

[0027] Specifically, the inner lining layer 3 is a thermoplastic elastomer, and the thickness of the inner lining layer 3 is 0.7 ± 0.15 mm.

[0028] The inner lining layer 3 is a thermoplastic elastomer (TPE), and the extrusion method is extrusion type, and the extrusion thickness is controlled at 0.7 ± 0.15 mm. The function of the inner lining layer 3 can not only protect the insulated wire core from damage, but also further play the role of waterproof isolation. To ensure the overall flexibility of the wire, while taking into account both flexibility and water resistance, the inner lining layer 3 is extruded with a thermoplastic elastomer (TPE) to ensure the overall roundness of the cable.

[0029] As a preferred embodiment of the present utility model, the cooling channel 4 is a polyurethane channel. The cooling channel 4 is divided into 8 identical water channels. Water is arranged in the water channels. The thickness of the upper and lower layers of the water channels is controlled at 1.4 ± 0.10 mm, the width of each water channel is 1.2 ± 0.10 mm, and the height is 2.0 ± 0.10 mm.

[0030] The cooling channel 4 is made of PU material, namely polyurethane. The thickness of the upper and lower layers of the water channel is controlled at 1.4 ± 0.10 mm, the width of each channel is 1.2 ± 0.10 mm, and the height is 2.0 ± 0.10 mm, which can ensure the smooth flow of water. Polyurethane has the advantages of chemical corrosion resistance, light weight, good wear resistance, good low-temperature flexibility, good weather resistance and excellent water absorption resistance. The cooling channel 4 of the present utility model is synchronously extruded by eight support bodies and a tile-shaped cavity using a special mold. This structure can balance the pressure from all directions and has good compressive resistance, so that the cable will not easily bend the water channel during normal operation, resulting in poor water flow. Water flows in the cooling channel 4 to cool the cable and keep the cable in good working condition.

[0031] Specifically, the tape 5 is longitudinally wrapped with a double-sided aluminum-plastic composite tape, and the overlapping thickness of the tape 5 is 10.0 ± 2.0 mm; the sheath 6 is an irradiated cross-linked polyolefin outer sheath 6 with a thickness of 2.2 ± 0.15 mm.

[0032] The tape 5 is longitudinally wrapped with a double-sided aluminum-plastic composite tape with an overlap of 10.0 ± 2.0 mm, and has the following advantages: ① reliable moisture-proof property. The double-sided aluminum-plastic composite tape has a good barrier effect on the intrusion of moisture, thus protecting the cable core. ② extremely high corrosion resistance. Since the metal tube shielding tape is coated with a plastic layer on both sides, an anti-chemical corrosion isolation layer is set between the metal component layer and corrosive water and gas.

[0033] The sheath 6 uses an irradiated cross-linked polyolefin outer sheath 6. This cross-linking method has no high temperature and no water, which can not only cross-link polyethylene but also improve the flame retardant and electrical properties of the cable. The cable has the characteristics of low smoke, halogen-free, flame retardant, fire-resistant and high temperature resistance. The specific properties are as follows:

[0034] ① High temperature resistance grade: The long-term allowable working temperature of the conductor 1 is divided into 105 °C, 125 °C, 150 °C (the ordinary cable is 70 °C or 90 °C); good flame retardant performance: the bundle combustion test is Class A. (The ordinary cable is Class C); no smoke and poisonous gas, light transmittance ≥ 90%, pH value ≥ 6.0 (the light transmittance of the ordinary low-smoke halogen-free cable ≥ 60%, pH value ≥ 4.3); excellent mechanical properties. The wear resistance reaches 160,000 times, and the service life exceeds 70 years.

[0035] ② The irradiated cross-linked low-smoke halogen-free flame retardant and fire-resistant wire and cable is applicable to power transmission and distribution systems below 10 kV, control circuits and various important places requiring flame retardant, fire-resistant, smokeless, non-toxic and high temperature resistance, and can be widely used in nuclear power plants, power plants, steel mills, oil wells, computer rooms, schools, entertainment places, crowded places and high-rise buildings, etc.

[0036] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present utility model.

Claims

1. A water photovoltaic cable, comprising a conductor, characterized in that: The structure of the cable is, from inside to outside, a conductor, an insulating layer, an inner lining layer, a cooling channel, a wrapping tape, and a sheath. The insulating layer is an outer insulating layer of irradiated cross-linked polyolefin. The cooling channel is a polyurethane channel. The cooling channel is divided into 8 identical water channels. Water is provided in the water channels. The thickness of the upper and lower layers of the water channels is controlled at 1.4±0.10mm. The width of each water channel is 1.2±0.10mm and the height is 2.0±0.10mm.

2. The overwater photovoltaic cable according to claim 1, characterized in that: The conductor is a D-type conductor, and the conductor shape formed by combining two D-type conductors is cylindrical.

3. The overwater photovoltaic cable according to claim 2, characterized in that: The outer layer of the D-type conductor is wrapped with a layer of cast polypropylene film, and the wrapping overlap rate is in the range of 5% to 15%.

4. A water photovoltaic cable according to claim 1, 2 or 3, characterized in that: The conductor is made of copper foil strands, with a stranding pitch of 16-18 mm, a fan height of 1.56±0.05 mm, and a fan width of 2.42±0.05 mm.

5. The overwater photovoltaic cable according to claim 4, characterized in that: The copper foil wire is made by rolling a copper round wire into a strip copper foil and then evenly wrapping it around a bulletproof wire. The conductor is made of 62 copper foil wire bundles with a diameter of 0.26 mm.

6. The overwater photovoltaic cable according to claim 1 or 5, characterized in that: The average thickness of the insulating layer is greater than or equal to 0.8 mm, and the thinnest point of the insulating layer is greater than 0.7 mm.

7. The overwater photovoltaic cable according to claim 1 or 5, characterized in that: The inner lining layer is a thermoplastic elastomer, and the thickness of the inner lining layer is 0.7±0.15 mm.

8. The overwater photovoltaic cable according to claim 1 or 5, characterized in that: The wrapping tape is a double-sided aluminum-plastic composite tape, and the overlapping thickness of the wrapping tape is 10.0±2.0mm.

9. The overwater photovoltaic cable according to claim 1 or 5, characterized in that: The sheath is a radiation cross-linked polyolefin outer sheath with a thickness of 2.2±0.15 mm.

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