Premium JKYJ Aerial Power Cable | High Purity Copper Core XLPE Overhead Line for Critical Grid Infrastructure

JKYJ products operate reliably in complex conditions, including urban core areas, heavy-load industrial areas, coastal salt spray environments, high-altitude cold regions, tropical high-temperature and high-humidity environments, and long-span mountain crossings. They are widely recognized as the preferred high-standard solution for core urban power grid upgrades, key industrial dedicated power lines, transportation hub power supply, important public facility power distribution, and high-reliability renewable energy grid connection projects.

• IEC 60840: Extruded insulated power cables with rated voltages of 3.6kV to 36kV
• IEC 60287: Standard for cable rating calculation and thermal performance
• IEC 60502: Extruded insulated power cables for medium-voltage systems
• CE Certification: Compliant with EU Low Voltage Directive and Electromagnetic Compatibility Requirements
• RoHS: Restriction of Hazardous Substances Directive
• ISO 9001: International Quality Management System Certification
• ISO 14001: Environmental Management System Certification
• ISO 45001: Occupational Health and Safety Management System Certification

National Standards and Power Industry Standards

• GB/T 14049-2008: Overhead insulated cables with rated voltages of 10kV and below
• GB/T 12706: Medium-voltage extruded insulated power cables and accessories
• GB/T 3956: Conductors of insulated power cables
• DL/T 5221: Technical specifications for the design of overhead distribution lines

Engineering Compliance

Complies with international design standards for wind load, ice load, temperature deformation, and sag tension of overhead power lines; meets urban high-standard power grid construction standards, industrial critical load power access requirements, coastal atmospheric corrosion protection design standards, and new energy power plant grid connection technical regulations. All electrical, mechanical, and aging indicators have been tested by authoritative third-party institutions, making it suitable for bidding and project acceptance in European, Southeast Asian, Middle Eastern, African, and Latin American markets.

• Model Definition: J = Overhead installation, K = Insulated type, YJ = XLPE insulation, copper conductor
• Rated Voltage Rating: 6/10kV, 12/20kV, 26/35kV
• Conductor Structure: Class 2 high-purity oxygen-free copper stranded conductor, concentric stranding
• Conductor Cross-sectional Area: 16mm²～400mm² full range of standard specifications, non-standard cross-sectional areas can be customized
• Insulation Material: High-density chemically cross-linked XLPE, modified to have UV resistance, ozone resistance, tracking resistance, and heat aging resistance
• Long-term Allowable Operating Temperature: 90℃
• Short-circuit Withstand Temperature: Maximum 250℃, short-circuit duration 5 seconds
• Minimum Installation Ambient Temperature: -20℃
• Minimum allowable bending radius: ≥15 times cable outer diameter
• Dielectric properties: High insulation class with low partial discharge, high insulation resistance, and stable breakdown strength under long-term electrical stress
• Conductor characteristics: Low resistivity, naturally oxidation-resistant, good structural compactness, and not easily loosened by long-term wind vibration
• Aging performance: The insulation layer maintains stable mechanical and electrical properties after long-term outdoor thermal oxidation aging
• Design service life: Over 30 years under standard installation, rated load, and normal environmental conditions
• Customization support: Insulation thickness upgrades, salt spray resistant enhancements, special leakage protection formulas, high-altitude and low-temperature adaptability, and color customization services are available.

• Urban Core Power Grid: Upgrading and new construction of medium-voltage trunk lines in urban centers, central business districts, high-end residential areas, and key municipal functional areas.
• Key Industrial and Heavy-Load Projects: Dedicated overhead power lines for heavy manufacturing plants, chemical industrial parks, metallurgical bases, large industrial zones, and high-load enterprises, requiring extremely high power stability.
• Major Municipal Transportation Infrastructure: Airport hubs, railway stations, port terminals, highway supporting power systems, and auxiliary medium-voltage overhead lines for urban rail transit.
• High-Reliability Renewable Energy Grid Connection: Medium-voltage outgoing main lines for wind farms and photovoltaic power stations, especially suitable for key grid connection nodes with stringent stability requirements.
• Large-Span Projects in Complex Terrain: Large-span overhead transmission lines crossing valleys and rivers in mountainous areas, relying on the stable mechanical and electrical properties of copper conductors to adapt to complex terrain layouts.
• Coastal and Highly Corrosive Environments: Medium-voltage distribution networks for key coastal cities, important island facilities, and offshore supporting projects, requiring resistance to salt spray, humidity, and atmospheric chemical corrosion.
• Public and high-security-requirement areas: Overhead line renovation in school areas, medical clusters, forest edge residential areas, and densely populated towns to improve line safety levels and reduce potential hazards.

• Ultra-low resistivity and higher transmission efficiency: The resistivity of high-purity compacted copper conductors is far lower than that of aluminum conductors, resulting in greater current-carrying capacity and lower energy loss during long-distance transmission. Even under frequent load fluctuations and long-term local overloads, it maintains stable output, perfectly meeting the high-standard power quality requirements of key projects.
• Natural oxidation resistance and stable contact performance: Copper conductors possess natural oxidation resistance and electrochemical corrosion resistance. Long-term outdoor exposure will not form a high-resistance oxide layer, ensuring stable connection performance of joints and accessories, preventing localized overheating, and reducing potential circuit hazards.
• Excellent thermal cycling stability and dielectric stability: The modified cross-linked polyethylene (XLPE) insulation layer can support long-term continuous operation at 90℃, exhibiting strong thermal cycling stability and excellent leakage resistance. It effectively suppresses partial discharge expansion under long-term electrical stress, delays insulation layer aging, and ensures long-term reliable operation.
• Higher safety redundancy and lower failure rate: The integrated thickened cross-linked polyethylene (XLPE) insulation layer forms reliable isolation protection, preventing short circuits and leaks caused by branch contacts, bird collisions, and interference from floating foreign objects. The overall failure probability of the system is significantly lower than that of ordinary aluminum overhead cables, providing a solid safety guarantee for core areas and important facilities.
• Strong environmental adaptability: The customized XLPE formula effectively resists UV radiation, ozone corrosion, thermal aging, salt spray corrosion, and industrial chemical gas corrosion. Even in extreme high-temperature, low-temperature, high-humidity, strong-wind, and corrosive industrial environments, it maintains stable structural and electrical performance without insulation cracking, deformation, or performance degradation.
• Compact structure and excellent vibration resistance: The tightly and uniformly stranded conductor structure resists long-term wind vibration and mechanical compression, and is not easily loosened or deformed. Suitable for long-term overhead installation in windy coastal areas and mountainous regions.
• Globally compatible accessories: Standard outer diameter and structural dimensions are compatible with mainstream international overhead lifting clamps, tensioning joints, wire connectors, and insulation accessories. No special customized accessories are required, simplifying engineering design, material procurement, and on-site construction coordination.

Why Choose JKYJ Medium Voltage Cables?

• Superior Raw Material Control and Rigorous Testing Throughout the Process: We use high-purity oxygen-free copper rods and imported top-grade XLPE insulation materials with a stable formula. Each batch of products undergoes comprehensive testing: power frequency withstand voltage, insulation resistance, partial discharge detection, mechanical tensile testing, structural dimensional inspection, and thermal aging testing. We provide complete certification documents, factory test reports, and third-party inspection certificates for project bidding, technical review, and final project acceptance.
• Professional One-Stop Engineering Support: Our experienced electrical engineering team provides free technical services, including current-carrying capacity calculation, sag-tension design parameter consultation, wind and ice load adaptability advice, model selection optimization, and overhead line layout design. We can develop customized products to fully comply with local project design standards, based on conditions such as coastal corrosion resistance, high-altitude low-temperature conditions, tropical high-temperature aging, and heavy-load conditions.
• Export-grade packaging and a stable global supply chain: All finished cables are packaged in international export-grade steel-wood reels, providing moisture-proof, shock-proof, pressure-proof, and sun-proof protection, suitable for long-distance sea freight and cross-border land logistics. We support large-volume order production, offering flexible FOB/CIF/CFR trade terms and controllable delivery cycles, serving global power companies, international EPC contractors, engineering distributors, and industrial end-users.
• Superior total lifecycle value: Direct sales from the manufacturer eliminate intermediaries, effectively controlling reasonable initial procurement costs. With the high transmission efficiency, ultra-low failure rate, and over 30-year design life of copper conductors, energy consumption, daily inspection workload, and subsequent line upgrade investment are effectively reduced, significantly lowering total lifecycle costs and creating long-term stable economic and operational value for medium-voltage power engineering projects.

• For urban core power grids, key industrial loads, critical public facilities, and high-reliability grid-connected projects, JKYJ copper core cable solutions are preferred. Select the appropriate voltage rating and conductor cross-sectional area based on system voltage, design load, and laying distance, ensuring sufficient current carrying capacity and temperature rise margin.
• For coastal areas, chemical industrial zones, and high-humidity and corrosive atmospheric environments, select customized XLPE versions with enhanced salt spray resistance, corrosion resistance, and leakage resistance to extend service life and ensure stable operation.
• Strictly adhere to the specified minimum bending radius during transportation and installation; avoid severe bending, dragging, squeezing, and heavy impacts to prevent internal insulation damage and potential electrical hazards.
• On-site laying is prohibited when the ambient temperature is below -20℃; for areas with significant seasonal temperature differences, allow for appropriate expansion and contraction margins to control line sag and tension within design limits.
• Use uniform copper or transitional type clamps and connectors to prevent galvanic corrosion, increased contact resistance, and localized overheating, ensuring synchronous and reliable operation of the entire line system. For long-span overhead lines crossing rivers, valleys, and areas susceptible to wind, professional calculations of sag tension and wind-induced vibration loads are used to optimize tower spacing and installation processes, fully leveraging the mechanical stability and electrical reliability advantages of JKYJ towers.