A copper-core, cross-linked polyethylene insulated, steel wire armored power cable for use in the petrochemical industry

Abstract

This utility model relates to the field of power cables, and more particularly to a copper-core cross-linked polyethylene insulated steel wire armored power cable for use in the petrochemical industry. It features a conductor made of high-purity oxygen-free copper wire of specific specifications, twisted in the same right-hand direction. The purity of the copper wire, the diameter of each wire, the number of strands, and the twisting pitch all meet specific requirements to ensure good conductivity and flexibility. The cross-linked polyethylene insulation layer tightly covers the conductor, with insulation thickness depending on the voltage and a moderate degree of cross-linking, providing excellent insulation and heat resistance. The steel wire armor layer is woven or wound into a double-layer structure using high-strength galvanized steel wire conforming to Q195 standards, with a coverage rate of not less than 80%, effectively enhancing mechanical protection. The inner sheath is made of polyvinyl chloride or polyethylene, and the outer sheath is made of oil-resistant, corrosion-resistant, and weather-resistant chlorosulfonated polyethylene or chlorinated polyethylene. Both layers have appropriate thicknesses; the inner sheath buffers and protects the insulation layer, while the outer sheath resists harsh environmental corrosion.

Description

Technical Field

[0001] This utility model relates to the field of power cables, and more particularly to a copper core cross-linked polyethylene insulated steel wire armored power cable for use in the petrochemical industry. Background Technology

[0002] In the petrochemical industry, the production environment is highly complex and unique. Numerous chemical production units, large-scale oil refining equipment, and various automated control systems all require a stable and reliable power supply to maintain normal operation. On the one hand, petrochemical sites contain large quantities of flammable and explosive gases and liquids, such as crude oil, gasoline, natural gas, and various organic chemicals, which places extremely high demands on the fire and explosion-proof performance of power cables. If a cable fault causes a spark or fire, it could potentially lead to a serious explosion, causing incalculable casualties and property damage. On the other hand, chemical production processes are often accompanied by high-temperature and high-pressure environments, with temperatures in some areas potentially remaining at 50°C or even higher for extended periods. Various corrosive media are also present, such as strong acids and alkalis like sulfuric acid, hydrochloric acid, and sodium hydroxide, as well as various sulfur-containing compounds. In such environments, the insulation and sheathing materials of ordinary cables are prone to aging and degradation, leading to decreased insulation performance and subsequent electrical faults such as short circuits and leakage, severely affecting the stability and safety of power transmission and threatening the continuity and reliability of production.

[0003] Furthermore, the cable laying paths within petrochemical enterprises are typically complex, potentially requiring passage through densely packed pipeline areas, underground trenches, and exposure to frequent mechanical vibrations and external pulling forces. During equipment installation, maintenance, and daily production activities, cables are also susceptible to mechanical damage such as impacts and compression. If the cable's mechanical strength is insufficient, it can easily damage the internal conductors and insulation layers, affecting the normal operation of the power supply. Utility Model Content

[0004] To completely solve the problem that traditional power cables cannot meet the usage requirements of the harsh environments in the petrochemical industry, this invention proposes the following technical solution:

[0005] A copper-core cross-linked polyethylene insulated steel wire armored power cable for use in the petrochemical industry, characterized in that it includes a conductor, the conductor is covered with a cross-linked polyethylene insulation layer, the cross-linked polyethylene insulation layer is covered with a steel wire armor layer, the steel wire armor layer is covered with an inner sheath, and the inner sheath is covered with an outer sheath.

[0006] Preferably, the conductor is made of multiple strands of high-purity oxygen-free copper wire, the purity of the copper wire is not less than 99.95%, the diameter of a single wire is 0.5mm-2.5mm, the number of strands is 19 to 37, and the twisting pitch is not greater than 15 times the diameter of a single wire.

[0007] Preferably, the cross-linked polyethylene insulation layer is tightly wrapped around the conductor, and its insulation thickness depends on the voltage. For 0.6 / 1kV cables, the insulation thickness is 3.4mm-4.0mm, and for 10kV cables, the insulation thickness is 5.0mm-5.5mm, with a cross-linking degree of 70%-85%.

[0008] Preferably, the steel wire armor layer is woven or wound from high-strength galvanized steel wire, the steel wire material conforms to the Q195 standard, the steel wire diameter is 2.0mm-4.0mm, the armor layer adopts a double-layer steel wire winding or weaving structure, and the armor coverage is not less than 80%.

[0009] Preferably, the inner protective layer is made of polyvinyl chloride or polyethylene and has a thickness of 1.5mm-2.5mm.

[0010] Preferably, the outer protective layer is made of chlorosulfonated polyethylene or chlorinated polyethylene, which is oil-resistant, corrosion-resistant, and weather-resistant, and has a thickness of 2.0mm-3.5mm, and is oil-resistant.

[0011] Preferably, the multiple strands of high-purity oxygen-free copper wire are twisted in the same direction and all are right-handed.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. The high-purity oxygen-free copper of this invention ensures excellent conductivity, effectively reducing losses during power transmission. The multi-strand stranding method gives the conductor good flexibility, facilitating cable bending and laying. The limited stranding pitch ensures tightness, preventing loosening of individual strands and maintaining conductor structural stability. The consistent right-hand stranding direction allows each copper strand to work together under tensile forces, further enhancing the conductor's mechanical properties and ensuring uniform current distribution within the conductor, guaranteeing stable power transmission.

[0014] 2. In petrochemical environments, the outer sheath is in direct contact with various corrosive chemicals and complex climatic conditions. The oil resistance, corrosion resistance, and weather resistance of chlorosulfonated polyethylene or chlorinated polyethylene effectively resist the erosion of these harmful substances, preventing corrosion damage to the cable's outer surface. Appropriate thickness ensures that the outer sheath has sufficient strength to withstand wear and chemical erosion during long-term use, maintaining the overall protective performance of the cable, protecting the internal structures from external environmental damage, thereby extending the cable's service life and ensuring the long-term stable operation of the power cable in petrochemical environments.

[0015] 3. The cross-linked polyethylene molecules of this invention form a three-dimensional network structure through a cross-linking reaction. This structure gives the insulation layer excellent heat resistance, enabling it to withstand high operating temperatures for extended periods, including during short circuits. Appropriate insulation thickness can withstand the electric field strength under the corresponding rated voltage, preventing electrical breakdown. A high degree of cross-linking further enhances the mechanical properties and chemical stability of the insulation layer, effectively preventing current leakage and ensuring insulation performance. This, in turn, guarantees the safe transmission of electricity within the conductor, preventing electrical faults such as leakage and short circuits.

[0016] 4. This utility model provides robust mechanical protection with its high-strength galvanized steel wire. In petrochemical environments, cables may be subjected to various mechanical forces, such as impact, compression, and tension. The double-layer steel wire winding or braiding structure, along with the high armor coverage, effectively disperses and withstands these external forces, preventing damage to the internal insulation layer and conductor. The galvanized layer also provides some corrosion protection, extending the service life of the steel wire and thus ensuring the integrity of the overall cable structure, guaranteeing normal operation of the cable in harsh industrial environments.

[0017] 5. The inner protective layer of this utility model is located between the cross-linked polyethylene insulation layer and the steel wire armor layer, mainly serving a buffering and protective function. Polyvinyl chloride or polyethylene material possesses a certain degree of flexibility and mechanical strength, preventing the steel wire armor layer from directly damaging the insulation layer when subjected to external forces. Simultaneously, it also provides a certain degree of moisture and water resistance, preventing external moisture from entering the interior through the gaps in the steel wire armor layer, avoiding moisture absorption and reduced insulation performance, and ensuring that the electrical performance of the insulation layer is not affected by moisture. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a copper core cross-linked polyethylene insulated steel wire armored power cable for use in the petrochemical industry.

[0019] In the diagram: 1. Conductor; 2. Cross-linked polyethylene insulation layer; 3. Steel wire armor layer; 4. Inner sheath; 5. Outer sheath. Detailed Implementation

[0020] A copper-core cross-linked polyethylene insulated steel wire armored power cable for use in the petrochemical industry is characterized by comprising a conductor 1, the conductor 1 being covered with a cross-linked polyethylene insulation layer 2, the cross-linked polyethylene insulation layer 2 being covered with a steel wire armor layer 3, the steel wire armor layer 3 being covered with an inner sheath 4, and the inner sheath 4 being covered with an outer sheath 5.

[0021] The conductor is composed of multiple strands of high-purity oxygen-free copper wire, with a purity of not less than 99.95%, a single wire diameter of 0.5mm-2.5mm, and 19 to 37 strands, with a stranding pitch not exceeding 15 times the single wire diameter. The multiple strands of high-purity oxygen-free copper wire are stranded in the same direction, all to the right. The DC resistance at 20℃ meets the national standard requirements, and annealing treatment is performed during the stranding process to eliminate internal stress, ensuring that the AC resistance at 50Hz does not exceed 0.017241Ω・mm² / m.

[0022] The cross-linked polyethylene insulation layer 2 tightly wraps around the conductor. Its insulation thickness depends on the voltage; for 0.6 / 1kV cables, the insulation thickness is 3.4mm-4.0mm, and for 10kV cables, it is 5.0mm-5.5mm, with a cross-linking degree of 70%-85%. This allows it to withstand a maximum operating temperature of 90℃ for extended periods, a short-circuit withstand temperature of up to 250℃, and an insulation resistance of not less than 5000MΩ·km at 20℃.

[0023] The steel wire armor layer 3 is woven or wound from high-strength galvanized steel wire. The wire material conforms to the Q195 standard, and the wire diameter is 2.0mm-4.0mm. The steel wire armor layer 3 adopts a double-layer steel wire winding or braiding structure, with an armor coverage rate of not less than 80%. This armor coverage rate ensures that the cable can withstand a tensile force of not less than 20kN during laying and a pressure of at least 1000N / 100mm without damaging the internal structure.

[0024] The inner sheath 4 is made of polyvinyl chloride or polyethylene, with a thickness of 1.5mm-2.5mm. It protects the insulation layer from mechanical damage by the armor layer and provides moisture and water resistance.

[0025] The outer sheath 5 is made of chlorosulfonated polyethylene or chlorinated polyethylene, which is oil-resistant, corrosion-resistant, and weather-resistant, with a thickness of 2.0mm-3.5mm. It is oil-resistant and can withstand an ambient temperature range of -40℃ to +80℃. Its smooth surface facilitates cable laying and installation, and it also has flame-retardant properties with an oxygen index of not less than 30.

Claims

1. A copper core crosslinked polyethylene insulated steel wire armored power cable for use in the field of petrochemical industry, characterized by, The device includes a conductor (1), which is covered with a cross-linked polyethylene insulation layer (2), which is covered with a steel wire armor layer (3), which is covered with an inner sheath layer (4), and which is covered with an outer sheath layer (5); the conductor (1) is made of multiple strands of high-purity oxygen-free copper wire, the purity of which is not less than 99.95%, the diameter of a single wire is 0.5mm-2.5mm, the number of strands is 19 to 37, and the twisting pitch is not greater than 15 times the diameter of a single wire; The cross-linked polyethylene insulation layer (2) is tightly wrapped around the conductor. Its insulation thickness depends on the voltage. For 0.6 / 1kV cables, the insulation thickness is 3.4mm-4.0mm, and for 10kV cables, the insulation thickness is 5.0mm-5.5mm. The cross-linking degree is 70%-85%. The steel wire armor layer (3) is woven or wound from high-strength galvanized steel wire. The steel wire material conforms to the Q195 standard. The steel wire diameter is 2.0mm-4.0mm. The armor layer adopts a double-layer steel wire winding or braiding structure. The armor coverage is not less than 80%.

2. A copper conductor crosslinked polyethylene insulated steel wire armoured power cable for use in the field of petrochemical industry as claimed in claim 1, characterized in that, The inner protective layer (4) is made of polyvinyl chloride or polyethylene and has a thickness of 1.5mm-2.5mm.

3. A copper conductor crosslinked polyethylene insulated steel wire armoured power cable for use in the field of petrochemical industry as claimed in claim 1, wherein, The outer protective layer (5) is made of chlorosulfonated polyethylene or chlorinated polyethylene with good oil resistance, corrosion resistance and weather resistance, and has a thickness of 2.0mm-3.5mm. It is oil resistant.

4. A copper conductor crosslinked polyethylene insulated steel wire armoured power cable for use in the field of petrochemical industry as claimed in claim 1, wherein, The multiple strands of high-purity oxygen-free copper wire are twisted in the same direction and all to the right.

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