Introduction
10kV cross-linked polyethylene (XLPE) insulated overhead cable is a medium-voltage power cable with a rated voltage of 10 kV, using XLPE as the main insulation material, and designed for overhead installation. It combines the cost-effectiveness of overhead lines with the safety of cable lines. Through its robust insulation layer, it effectively prevents phase-to-phase short circuits and electric shock hazards, making it suitable for urban and rural distribution network overhead lines where high power supply reliability is required.
Application
Mainly used for overhead main lines and branch lines in urban and rural 10kV distribution networks.
Typical application scenarios include: medium-voltage overhead lines in urban grid renovation projects and areas where underground installation is difficult; main distribution networks in suburban and rural areas; power supply lines within industrial and mining zones; and outdoor overhead installations in challenging environments such as forests, rainy regions, and polluted areas.
Production
Conductor: Made of aluminum or aluminum alloy, tightly compressed and stranded. The cross-section is typically large to reduce resistance and corona loss, with mechanical strength meeting overhead tension requirements.
Insulation: A core process. Ultraclean XLPE material is extruded and cross-linked in one step using a triple-layer co-extrusion process (conductor screen + insulation + insulation screen), forming a uniform, dense, and defect-free insulation layer. This is key to ensuring its resistance to high electric field strength.
Metallic Screen: A metallic screen layer (e.g., copper tape, aluminum alloy tape) is tightly wrapped or stranded over the insulation screen to evenly distribute the electric field, conduct fault currents, and provide necessary mechanical protection for the cable.
Outer Sheath (if applicable): Depending on design requirements, a layer of weather-resistant black high-density polyethylene (HDPE) or polyvinyl chloride (PVC) sheath may be extruded over the metallic screen to provide additional UV protection, corrosion resistance, and mechanical protection.
Key Process Control: Production must take place in a highly clean environment with strict control over XLPE material purity; precise control of the triple-layer co-extrusion process and cross-linking (typically using CCV catenary lines) to ensure the insulation layer is free of impurities and micro-voids; 100% partial discharge testing and power frequency withstand voltage testing; sampling for hot elongation tests to verify the cross-linking degree.
Services
Selection Consultation: Provides professional advice on conductor material (aluminum/aluminum alloy), cross-section, need for a sheath, and metallic screen structure (e.g., radial waterproof type) based on factors such as line design ampacity, short-circuit capacity, ambient temperature, altitude, span length, and lightning protection requirements (e.g., integration with OPGW or ground wires).
Fault Analysis and Maintenance Support: Assists in fault location and analysis for power lines and provides operation and maintenance recommendations.
Advantages
High Power Supply Reliability: The insulation layer effectively prevents phase-to-phase short circuits and single-phase grounding faults caused by trees, birds, foreign objects, etc., significantly reducing unplanned power outages. Especially suitable for areas prone to lightning, heavy rain, and pollution.
Enhanced Safety: Compared to bare conductors, it significantly reduces the risk of electric shock and accidents caused by external forces.
High Mechanical Strength and Environmental Durability: The conductor and design meet the mechanical tension requirements for overhead installation; XLPE insulation and optional sheathing offer excellent heat resistance (long-term permissible operating temperature 90°C), weather resistance (UV and ozone resistant), and anti-aging properties, ensuring a long service life (up to 30 years or more).
High Ampacity and Low Loss: XLPE insulation allows for higher operating temperatures, providing better current-carrying capacity than PVC insulation for the same cross-section; compacted conductors reduce skin effect, lowering line losses.
Cost-Effective Construction and Maintenance: Lower cost and shorter construction cycles compared to underground cable installation; reduced maintenance workload compared to bare conductor lines, offering advantages in lifecycle costs.
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