Environment-friendly, high-conductivity, wear-resistant, anti-seismic, rat-proof and ant-proof low-voltage power cable for photovoltaic system

Abstract

The utility model discloses an environment-friendly, high-conductivity, wear-resistant, shock-resistant, rat-proof and ant-proof low-voltage power cable for a photovoltaic system, and the cable sequentially comprises a conductor which is made of oxygen-free copper and has the conductivity of not less than 101% IACS (International Annealed Copper Standard) from the inside to the outside; an insulating layer; an inner sheath; the protective layer is made of a polyhexamethylene terephthalamide material; and a galvanized steel wire is embedded in the outer protective layer, and convex ridge structures arranged along the central axis of the cable are uniformly distributed on the periphery of the outer protective layer. The cable is suitable for being used in complex occasions such as fields and buildings in special environments, the damage to the cable caused by environmental factors is reduced, the service life of the cable is prolonged, and the electricity utilization safety of electric equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, especially to the field of power cables for photovoltaic systems, and specifically to an environment-friendly, highly conductive, wear-resistant, earthquake-resistant, rat-and-termite-proof low-voltage power cable for photovoltaic systems. Background Art

[0002] With the continuous enhancement of people's awareness of safety, environmental protection, and energy conservation, environment-friendly and energy-saving cables have gradually been recognized by people and have begun to be applied in many fields such as buildings, hospitals, and subways. It can be seen from the gradually increasing annual usage of halogen-free and low-smoke cables that environment-friendly cables have a very large market demand. At present, in domestic photovoltaic systems, the low-voltage power cables used from the busbar trunking unit to the DC cabinet, from the DC cabinet to the inverter, and from the inverter to the transformer mostly contain halogens. When burned, they will produce smoke, toxic, and corrosive gases, causing "secondary disasters". Once a fire occurs, it will make the rescue work difficult to carry out. Environment-friendly cables do not produce harmful halogen gases, do not produce corrosive gases, generate less heat when burned, do not pollute the soil, can be recycled, do not harm the environment when discarded, and will not spread carcinogenic substances such as dioxins.

[0003] Cables for photovoltaic systems are mostly used in the wild, and the environment is relatively complex. They are easily scratched and rubbed by sharp stones or sand in the usage scenarios, so it is required that the cables have good wear-resistant mechanical properties. Moreover, when the cables are laid in pipelines or outdoor environments, they are more likely to attract animals such as rats and termites, and then be gnawed and damaged, seriously affecting the service life and electrical safety of the cables. Therefore, in areas with more rats and termites, certain protection measures need to be added to avoid damage to the cables. At present, the methods for preventing rats and termites adopted by cable products mainly include two types: chemical method and physical method. The chemical method is to add chemical drugs to the cable sheath material to poison rats and termites by the principle of toxicity; the physical method is to use materials with higher hardness such as nylon materials to prevent rats and termites from damaging due to hardness. With the strengthening of people's environmental protection awareness, chemical-method rat-and-termite-proof cables will be gradually phased out. Content of the Utility Model

[0004] The purpose of the utility model is to provide an environment-friendly, highly conductive, wear-resistant, earthquake-resistant, rat-and-termite-proof low-voltage power cable for photovoltaic systems, so that the cable can be used in harsh and complex environments and ensure the normal operation of the cable.

[0005] The technical solution adopted by the utility model to achieve the above purpose is: an environment-friendly, highly conductive, wear-resistant, earthquake-resistant, rat-and-termite-proof low-voltage power cable for photovoltaic systems, with a conductivity not less than 101% IACS, and the material is high-purity oxygen-free copper with a copper content of 99.999%; an insulating layer; an inner sheath; a protective layer, with the material being polyhexamethylene terephthalamide; an outer sheath, with galvanized steel wires embedded inside it, and ridge structures arranged along the central axis of the cable evenly distributed on its outer circumference.

[0006] Among them, the galvanized steel wires embedded inside the outer protective layer can play a role in preventing rats.

[0007] Ridge structures are evenly distributed on the outer periphery of the outer protective layer along the central axis of the cable. The design of the ridge support structure increases the stability of the cable, reduces the impact force of vibration on the cable, improves the friction and seismic resistance of the cable, plays a very good role in wear resistance and seismic resistance during construction, and the outer sheath in the form of a ridge support also further prevents rats from gnawing.

[0008] Furthermore, the gaps between the galvanized steel wires embedded inside the outer protective layer are arranged in a spiral pattern.

[0009] Among them, the galvanized steel wires are of a single-layer structure, the average gap between adjacent galvanized steel wires is not greater than 4 mm, and any gap does not exceed 8 mm.

[0010] In this utility model, the distance between the bottoms of adjacent ridge structures is 5.0 mm.

[0011] Among them, the conductor is of a special-shaped single-wire circular compacted structure.

[0012] Among them, the materials of the insulating layer, the inner sheath and the outer protective layer are all 150°C halogen-free low-smoke flame-retardant irradiated cross-linked polyolefin materials.

[0013] Among them, the diameter of the galvanized steel wire of the second protective layer is 0.8 mm.

[0014] In this utility model, the conductor of the cable adopts oxygen-free copper with a conductivity reaching 101% IACS, which has a high conductivity and can reduce line losses.

[0015] The structural form of the cable meets the requirements for application in voltages of 0.6 / 1 kV and below.

[0016] In this utility model, the material of the protective layer has a melting point of up to 310°C and a temperature resistance grade of 150°C, meeting the functions of termite prevention and tear resistance, maintaining excellent rigidity in a wide temperature range, playing a very good physical termite prevention effect, and achieving the purpose of environmental protection.

[0017] The materials of the insulating layer, the inner sheath and the outer protective layer have the characteristics of oxidation resistance, acid and alkali resistance, water resistance, acid and alkali resistance, ozone resistance and ultraviolet resistance, avoiding the oxidation and blackening of the conductor caused by electron beam irradiation and long-term high-temperature working temperature of the cable, which affects the electrical conductivity.

[0018] The conductor of this utility model is a compacted conductor composed of high-purity oxygen-free copper special-shaped single wires with a conductivity reaching 101% IACS. The structure is tight, and the filling coefficient can reach more than 96%, ensuring that the conductor has good appearance and electrical conductivity. The outer diameter of the special-shaped single-wire conductor structure with the same cross-section is smaller than that of the non-special-shaped single wire, saving raw materials.

[0019] The utility model adopts a combined structure of an inner sheath and an outer sheath, has ozone resistance, ultraviolet resistance, anti-corrosion and waterproof properties, and meets different laying environments. It is especially suitable for use in complex occasions such as the wild and buildings under special environments, reduces the damage to the cable caused by environmental factors, improves the service life of the cable, and ensures the power safety of electrical equipment. Brief Description of the Drawings

[0020] Figure 1 It is a cross-sectional schematic diagram of the cable of the utility model;

[0021] Figure 2 is Figure 1 partial schematic diagram of.

[0022] Reference numerals in the drawings: 1, conductor; 2, insulating layer; 3, inner sheath; 4, protective layer; 5, galvanized steel wire; 6, outer sheath; 7, ridge structure. Specific Embodiments

[0023] The following further describes the utility model in detail with reference to the drawings and embodiments.

[0024] The embodiments of the utility model are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. For parts not described in the following embodiments of the utility model, they should all be understood as well-known technologies in the art, such as the structures of gearboxes and transmission boxes, the installation positions and installation methods of non-contact labyrinth seals, etc.

[0025] An environmentally friendly high-conductivity, wear-resistant, earthquake-resistant, rat and ant-proof low-voltage power cable for a photovoltaic system, as Figure 1 shown, the cable sequentially includes a conductor, an insulating layer, an inner sheath, a protective layer, and an outer sheath from the inside to the outside.

[0026] Among them, for the conductor, the conductivity is not less than 101% IACS, and the material is high-purity oxygen-free copper with a copper content of 99.999%; the conductor adopts a compacted conductor composed of shaped single wires, that is, a shaped single wire circular compacted structure, with a tight structure, and the filling coefficient can reach more than 96%, ensuring that the conductor has good appearance and electrical conductivity; the outer diameter of the shaped single wire conductor structure with the same cross-section is smaller than that of the non-shaped single wire, saving raw materials.

[0027] The materials of the insulating layer, the inner sheath, and the outer sheath are all 150 °C halogen-free, low-smoke, flame-retardant irradiated cross-linked polyolefin materials, and the insulating layer can resist copper oxidation and is resistant to acids and alkalis;

[0028] The protective layer is made of PA6T polyhexamethylene terephthalamide material, which is a copolymer of PA6T and PA66. It has excellent heat resistance and good high-temperature rigidity, with a melting point of 310°C and a heat-resistant grade reaching 150°C. PA6T can still maintain a relatively high modulus at high temperatures. The modulus at 120°C is 55% of the modulus at 23°C. It can maintain good rigidity in a wide temperature range and has a good termite-proof effect.

[0029] The outer protective layer has galvanized steel wires embedded inside it, and there are ridge structures arranged evenly along the central axis of the cable on its outer periphery. The outer sheath has waterproof, acid and alkali resistant, ozone resistant and ultraviolet resistant properties, meeting different laying environments. The tensile strength of the galvanized steel wire is 700 MPa, and the single wire diameter is 0.8 mm.

[0030] Among them, the height L1 of the ridge structure is 1.0 mm, the width L2 of the bottom of the ridge structure is 1.5 mm, and the spacing L3 between adjacent two ridges is 5.0 mm.

[0031] Among them, the galvanized steel wires embedded inside the outer protective layer are arranged in an intermittent spiral pattern, which is a non-tightly stranded structure, and there are gaps between the single wires of each layer; the galvanized steel wires are of a single-layer structure, and the average gap between adjacent galvanized steel wires is not more than 4 mm, and any gap does not exceed 8 mm.

[0032] The power cable of the present utility model has the characteristics of environmental protection, high conductivity, wear resistance, earthquake resistance and anti-rat and anti-termite properties. It is not only applicable to the places from the busbar trunking unit to the DC cabinet, from the DC cabinet to the inverter, and from the inverter to the transformer in the photovoltaic system, but also applicable to crowded places such as high-rise buildings, hospitals, hotels, and subway stations.

[0033] The power cable for photovoltaic systems uses oxygen-free copper with a conductivity reaching 101% IACS, the insulation uses 150°C halogen-free low-smoke flame-retardant irradiated cross-linked polyolefin insulation material, the inner sheath uses 150°C halogen-free low-smoke flame-retardant irradiated cross-linked polyolefin sheath material, the termite-proof layer uses PA6T polyhexamethylene terephthalamide sheath material, the rat-proof layer uses galvanized low-carbon steel wires embedded inside the outer sheath, and the outer sheath uses 150°C halogen-free low-smoke flame-retardant irradiated cross-linked polyolefin sheath material. In addition to better environmental protection performance, the product also has high conductivity, anti-rat and anti-termite properties and wear resistance and earthquake resistance. The line loss is only 99% or even lower than that of ordinary cables. The electron beam irradiation process raises the operating temperature of the cable from 90°C to 150°C, increasing the current-carrying capacity by 30 - 40% compared with ordinary halogen-free low-smoke cables, with strong overload capacity and more secure and reliable electrical performance. It has excellent weather resistance and excellent mechanical properties, especially wear resistance and earthquake resistance. It is especially suitable for use in complex occasions such as the wild and buildings in special environments, reducing the damage to the cable caused by environmental factors, increasing the service life of the cable, and ensuring the power safety of electrical equipment.

[0034] The power cable of the present utility model can achieve the following characteristics:

[0035] Ozone resistance: at 40 ± 2°C, humidity 55 ± 5%, for 72 h, ozone concentration (200 ± 50) x 10-6, the cable does not crack;

[0036] UV resistance: at 63°C for 720 h, humidity 65%, wavelength 300 - 400 nm, minimum power 60 W / m, the cable does not crack.

Claims

1. An environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems, characterized by: The cable includes from inside to outside Conductor: oxygen-free copper with conductivity not less than 101% IACS; Insulation layer; Inner sheath; Protective layer, made of polyhexamethylene terephthalamide material; The outer sheath has galvanized steel wire embedded inside and a ridge structure evenly distributed on its periphery along the central axis of the cable. The height L1 of the ridge structure is 1.0 mm, the width L2 of the bottom of the ridge structure is 1.5 mm, and the spacing L3 between two adjacent ridges is 5.0 mm.

2. The environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems as claimed in claim 1, characterized in that: The galvanized steel wires embedded inside the outer sheath are arranged in a spiral with gaps.

3. The environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems as claimed in claim 2, characterized in that: The galvanized steel wire has a single-layer structure, and the average gap between adjacent galvanized steel wires is no more than 4mm.

4. The environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems as claimed in claim 1, characterized in that: The conductor is a special-shaped single-wire circular compressed structure.

5. The environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems as claimed in claim 1, characterized in that: The materials of the insulation layer, inner sheath and outer sheath are all 150℃ halogen-free, low-smoke, flame-retardant, radiation-cross-linked polyolefin materials.

6. The environmentally friendly, high-conductivity, wear-resistant, earthquake-resistant, rat-ant-proof low-voltage power cable for photovoltaic systems as claimed in claim 1, characterized in that: The diameter of the galvanized steel wire of the second protective layer is 0.8mm.

Images