High-bending-resistance refractive volt cable

Abstract

The utility model relates to a high-bending-resistance refractive volt cable. The problems that an existing photovoltaic cable is weak in anti-bending capability and a conductor is easy to break in a large wind power scene are solved. The cable comprises an insulating layer and a sheath layer, and further comprises a conductive layer, the insulating layer is coated outside the conductive layer, and the sheath layer is coated outside the insulating layer; the conductive layer comprises a first conductor and a second conductor, and the first conductor and the second conductor are formed by twisting; and the bending-resistant core is arranged in the conductive layer, the bending-resistant core comprises copper foil wires and bulletproof wires, and the copper foil wires and the bulletproof wires are arranged in a mutual twisting manner. According to the utility model, the first conductor and the second conductor are mutually twisted, and the bending-resistant core is arranged and supports the conductive layer in the conductive layer, so that the bending resistance of the product is improved, and the problem that the product is easy to break under various swing working conditions of strong wind power is solved; the device is suitable for outdoor permanent use scenes of free movement and free suspension, and meets the requirements of customers.

Description

Technical Field

[0001] This utility model relates to a new energy solar photovoltaic cable, specifically a high-bend-resistant photovoltaic cable. Background Technology

[0002] With the development of photovoltaics in my country, the installation scenarios are becoming increasingly complex. Some customers (such as Sungrow Power) have proposed that photovoltaic cables will be installed in mountainous areas, wilderness areas or at sea where the wind force reaches about level 15. They require that the photovoltaic cables have high bending resistance, can sway back and forth in the wind without breaking, and have a service life of no less than 25 years.

[0003] Existing standard photovoltaic cables conforming to 2Pfg 1169-2007, EN 50618-2014, IEC 62930-2017, and UL 4703 standards typically consist of a conductor, an insulation layer, and a sheath. The conductor is made of bare copper wires twisted together with a specific pitch, usually 25 times. When such cables are installed in windy conditions, the photovoltaic cables sway and bend in the wind, which can easily cause the conductor to break, resulting in a short circuit and no power transmission, posing a significant quality hazard. Utility Model Content

[0004] To address the problem of weak bending resistance and easy conductor breakage in existing photovoltaic cables in windy conditions, this invention provides a high-bending-resistance photovoltaic cable.

[0005] The technical solution of this utility model is: a high-bend-resistant photovoltaic cable, comprising an insulation layer and a sheath layer, and further comprising:

[0006] The conductive layer is covered by the insulating layer, and the sheath layer is covered by the insulating layer; the conductive layer includes a first conductor and a second conductor, which are twisted together.

[0007] A bend-resistant core is disposed within a conductive layer. The bend-resistant core comprises copper foil wires and bulletproof wires, which are twisted together.

[0008] As a further improvement of this utility model, the first conductor is composed of multiple tin-plated copper wires twisted together, and the pitch-to-diameter ratio of the first conductor is 14-16.

[0009] As a further improvement of this utility model, the second conductor is composed of multiple tin-plated copper wires twisted together, and the pitch-to-diameter ratio of the second conductor is 14-16.

[0010] As a further improvement of this utility model, a first conductor is formed by twisting together 9 tin-plated copper wires, and a second conductor is formed by twisting together 10 tin-plated copper wires. The first conductor and the second conductor are twisted together in the same direction to form the conductive layer.

[0011] As a further improvement of this utility model, the four strands of the first conductor and the two strands of the second conductor are twisted together in the same direction to form the conductive layer, and the pitch to diameter ratio of the conductive layer is 8-12.

[0012] As a further improvement of this utility model, there are multiple bulletproof wires, and different bulletproof wires are twisted together with copper foil wires.

[0013] As a further improvement of this utility model, the bulletproof wire has six strands, which are wrapped around the outside of the copper foil wire.

[0014] As a further improvement of this utility model, the bulletproof wire is made of 200D KEVLAR in one piece.

[0015] As a further improvement of this utility model, the insulating layer is integrally molded from cross-linked polyolefin, and the thickness of the insulating layer is 0.7-1.0 mm; the sheath layer is integrally molded from cross-linked polyolefin, and the thickness of the sheath layer is 0.8-1.1 mm.

[0016] As a further improvement of this utility model, the sheath layer and the insulating layer are continuously extruded and tightly bonded by a series extruder, and the outer surface of the sheath layer has a surface finish of grade 11.

[0017] The beneficial effects of this utility model are that it sets up a first conductor and a second conductor, which are twisted together, and also sets up a bend-resistant core, which supports the conductive layer within the conductive layer, thereby improving the product's bend resistance and solving the problem of easy breakage of the product under various swaying conditions in strong winds. It is suitable for outdoor permanent use scenarios where the product can be freely moved and suspended, thus meeting the needs of such customers. Attached Figure Description

[0018] Appendix Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] In the diagram, 1 is the insulating layer; 2 is the sheath layer; 3 is the conductive layer; 4 is the copper foil wire; and 5 is the bulletproof wire. Detailed Implementation

[0020] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0021] Depend on Figure 1 As shown, a high-bend-resistant photovoltaic cable includes an insulation layer 1 and a sheath layer 2, and further includes:

[0022] The conductive layer 3 is covered by the insulating layer 1, and the sheath layer 2 is covered by the insulating layer 1; the conductive layer 3 includes a first conductor and a second conductor, which are twisted together.

[0023] A bend-resistant core is disposed within the conductive layer 3. The bend-resistant core comprises copper foil wires 4 and bulletproof wires 5, which are twisted together. The beneficial effects of this invention are that by incorporating a first conductor and a second conductor, which are twisted together, and simultaneously providing a bend-resistant core that supports the conductive layer, the photovoltaic cable's bend resistance is increased from approximately 3000 swings to approximately 20000 swings before breakage. This significantly improves the product's bend resistance, and the bending radius can be reduced to 5 times the product diameter or less. It solves the problem of easy breakage under strong winds and various swinging conditions, making it suitable for permanent outdoor use in scenarios requiring free movement and suspension, thus meeting the needs of such customers.

[0024] The first conductor comprises multiple strands of tin-plated copper wire, with a pitch-to-diameter ratio of 14-16. Specifically, the second conductor comprises multiple strands of tin-plated copper wire, with a pitch-to-diameter ratio of 14-16. This allows the product to withstand a current carrying capacity of 55 amperes. The stranding pitch is a key parameter in the stranding process; the distance a single wire travels in one revolution along the strand axis is called the stranding pitch. The ratio of pitch to diameter is called the pitch-to-diameter ratio or pitch multiple. Typically, the pitch multiple of existing bundled strands is around 25; the pitch multiple of the bundled strands of this invention is around 15. A first conductor is formed by stranding 9 tin-plated copper wires, and a second conductor is formed by stranding 10 tin-plated copper wires. The first and second conductors are twisted in the same direction to form the conductive layer 3. Four strands of the first conductor and two strands of the second conductor are twisted in the same direction to form the conductive layer 3, with a pitch-to-diameter ratio of 8-12. The pitch ratio of the twisted strands in this invention is approximately 10. This reduces the product's volume and increases its resistance to bending.

[0025] The bulletproof wire 5 consists of multiple strands, each twisted together with the copper foil wire 4. Specifically, there are six bulletproof wires 5, which are wrapped around the outside of the copper foil wire 4. More specifically, the bulletproof wire 5 is integrally molded from 200D (D stands for Denier, a unit used to describe the fineness of fibers or yarns; 200D indicates that the weight of the thread is 200 grams per 9000 meters) KEVLAR (poly(p-phenylene terephthalamide)). KEVLAR is a high-performance aramid fiber material. Its chemical name is poly(p-phenylene terephthalamide) (PPTA), which has low density, high strength, good toughness, and high temperature resistance. It is widely used in various fields to increase the overall tensile strength of the wire and prevent breakage during use.

[0026] The insulating layer 1 is integrally molded from cross-linked polyolefin, and its thickness is 0.7-1.0 mm. The sheath layer 2 is integrally molded from cross-linked polyolefin, and its thickness is 0.8-1.1 mm. The cross-linked polyolefin insulating material is extruded and wrapped around the outside of the stranded conductive layer, with an average thickness greater than 0.7 mm. The insulation resistance at 20℃ is 2.6 × 10⁻⁶. 14 The insulation strength (Ω·cm) is significantly higher than conventional standards, providing stable and high-quality insulation performance. The sheath layer protects the insulation layer. Specifically, the sheath layer 2 and the insulation layer 1 are continuously extruded and tightly bonded together using a series extruder, and the outer surface of the sheath layer 2 has a surface finish of grade 11. The insulation layer and the sheath layer are tightly bonded and cannot be peeled off, avoiding the problem of easy bending and breakage of ordinary photovoltaic cables where the insulation and sheath are peelable, greatly improving bending resistance; the smooth and bright outer surface of the sheath layer reduces friction with nearby objects, also contributing to bending resistance and increasing product lifespan.

[0027] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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. They do not 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 on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A high-bend-resistant photovoltaic cable comprising an insulating layer (1) and a sheath layer (2), characterized in that: Also include: The conductive layer (3), the insulating layer (1) is covered outside the conductive layer (3), the sheath layer (2) is covered outside the insulating layer (1);The conductive layer (3) includes a first conductor and a second conductor, and the first conductor and the second conductor are twisted; The bending-resistant core is arranged in the conductive layer (3), and the bending-resistant core includes copper foil wire (4) and bulletproof wire (5), and the copper foil wire (4) and the bulletproof wire (5) are twisted with each other.

2. A highly bend resistant photovoltaic cable according to claim 1, characterized in that The first conductor includes a plurality of tinned copper wires twisted together, and the pitch-to-diameter ratio of the first conductor is 14-16.

3. A highly bend resistant photovoltaic cable according to claim 2, characterized in that The second conductor includes a plurality of tinned copper wires twisted together, and the pitch-to-diameter ratio of the second conductor is 14-16.

4. A highly bend resistant photovoltaic cable according to claim 3, characterized in that Nine tinned copper wires are twisted to form a first conductor, and ten tinned copper wires are twisted to form a second conductor, and the first conductor and the second conductor are twisted in the same direction to form the conductive layer (3).

5. A highly bend resistant photovoltaic cable according to claim 4, characterized in that Four first conductors and two second conductors are twisted in the same direction to form the conductive layer (3), and the pitch-to-diameter ratio of the conductive layer (3) is 8-12.

6. The highly bend resistant photovoltaic cable of claim 1, wherein The bulletproof wire (5) has a plurality of different bulletproof wires (5) and copper foil wires (4) twisted with each other.

7. The highly bend resistant photovoltaic cable of claim 1, wherein The bulletproof wire (5) has six bulletproof wires (5), and the bulletproof wire (5) is covered outside the copper foil wire (4).

8. The highly bend resistant photovoltaic cable of claim 1, wherein The bulletproof wire (5) is integrally formed by 200D KEVLAR.

9. The highly bend resistant photovoltaic cable of claim 1, wherein The insulating layer (1) is integrally formed by crosslinked polyolefin, the thickness of the insulating layer (1) is 0.7-1.0mm, the sheath layer (2) is integrally formed by crosslinked polyolefin, and the thickness of the sheath layer (2) is 0.8-1.1mm.

10. The highly bend resistant photovoltaic cable of claim 1, wherein The sheath layer (2) and the insulating layer (1) are continuously extruded and closely combined by a series extruder, and the outer surface of the sheath layer (2) has a smoothness of 11 levels.

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