Aluminum JKLYJ Overhead Cable | XLPE Insulated Medium Voltage Line for Utility & EPC Projects

JKLYJ is a high-performance all-aluminum medium-voltage overhead insulated cable featuring a fully stranded, tightly packed aluminum conductor and high-quality cross-linked polyethylene (XLPE) insulation. Available in 6/10kV, 12/20kV, and 26/35kV standard medium-voltage ratings, it is designed for global utility distribution networks, municipal overhead transmission, energy infrastructure, and large-scale industrial power transmission.

Unlike steel-cored overhead cables and traditional PVC-insulated overhead cables, JKLYJ utilizes a steel-free, all-aluminum construction, resulting in lighter weight, superior flexibility, higher heat resistance, and lower dielectric loss. It perfectly meets the core evaluation criteria of international electrical engineers, utility procurement departments, EPC contractors, and global distributors, focusing on thermal stability, dielectric reliability, climate adaptability, ease of installation, and long-term operational stability.

Integrated extruded cross-linked polyethylene (XLPE) insulation eliminates the risks associated with exposed conductors, optimizes line corridor utilization, and simplifies daily network operation and management. JKLYJ is manufactured entirely in accordance with international electrical codes and national power industry standards, offering a complete range of sizes, consistent material formulations, and perfect compatibility with global standard overhead hardware. It operates stably in cold, high-altitude regions, hot, tropical regions, high-salt coastal environments, complex mountain terrain, and industrial pollution environments, making it an ideal standardized solution for medium-voltage power grid expansion, aging line renovation, renewable energy grid integration, and municipal power projects.

• IEC 60840, IEC 60287, IEC 60502-2
• CE Low Voltage Directive
• RoHS Restriction of Hazardous Substances Directive
• ISO 9001 Quality Management System
• ISO 14001 Environmental Management System
• ISO 45001 Occupational Health and Safety Management System

• GB/T 14049-2008, GB/T 1179-2017, GB/T 12706.2
• DL/T 5221 Technical Specification for Design of Overhead Distribution Lines

Complies with international design standards for wind and ice loads on overhead lines, technical specifications for high-altitude power supply, specifications for coastal atmospheric degradation resistance, and technical requirements for grid connection of renewable energy power plants. All electrical and mechanical specifications meet the mainstream power grid connection standards in Asian, African, Latin American, and Middle Eastern markets.

Model Definition

JKLYJ (Overhead Insulation, Aluminum Core, XLPE Insulation)

Rated Voltage Rating

6/10kV, 12/20kV, 26/35kV

Conductor Structure

Type 2 compact stranded pure aluminum conductor, concentric stranding design

Conductor Cross-sectional Area

16mm² to 400mm², full range coverage

Insulation Material

High-density chemically cross-linked XLPE, UV-inhibited and thermally stabilized

Continuous Permissible Operating Temperature

90°C

Short Circuit Heat Resistance Rating

Up to 250°C, short circuit duration 5 seconds

Minimum Field Installation Temperature

-20°C

Minimum Permissible Bending Radius

15 times the cable outer diameter

Partial Discharge Performance

Extremely low discharge amplitude at rated voltage

Insulation Volume Resistivity

Maintains high stability under long-term high-temperature aging

Design Service Life

Over 30 years under standard installation and normal operating conditions

Customization Options

Insulation thickness, special salt spray resistant formulation, high-altitude adaptability, and non-standard cross-sections can be customized according to project requirements.

Typical Application Scenarios

• Medium-voltage main and branch distribution lines for urban, suburban, and rural power grid expansion and renovation
• Medium-voltage outgoing lines and grid-connected overhead transmission lines for wind power plants and photovoltaic power stations
• Outdoor medium-voltage power supply layout for large industrial parks, chemical industrial parks, mining clusters, and logistics industrial parks
• Layout of long-span overhead transmission projects in mountainous, hilly areas and across rivers
• Construction of medium-voltage distribution networks for coastal cities, islands, and tropical high-humidity areas
• Medium-voltage overhead transmission lines supported by national highways, railways, and municipal infrastructure
• Upgrading of overhead lines in forested areas and densely populated areas, replacing exposed conductors to improve power grid safety levels

• Superior Thermal and Dielectric Stability: XLPE insulation offers excellent heat resistance, allowing continuous operation at 90°C, far exceeding the temperature limits of traditional PVC insulated cables. The optimized, compact stranded aluminum structure minimizes DC resistance and maintains stable current-carrying capacity under long-term full load and temperature fluctuations. A low partial discharge design ensures excellent dielectric integrity throughout decades of grid operation.
• Comprehensive Climate Adaptability: The specially formulated XLPE compound provides strong resistance to UV radiation, ozone oxidation, thermal aging, salt spray corrosion, and industrial chemical vapor corrosion. Even in extremely cold, hot, humid, windy, and corrosive coastal environments, the cable maintains stable mechanical and electrical properties without insulation cracking, shrinkage, or performance degradation.
• Lightweight and Flexible Structure Facilitates Engineering Deployment: The all-aluminum structure significantly reduces the overall weight of the cable, thereby reducing the mechanical load on the tower structure. Good bending flexibility simplifies transportation, handling, and field laying, and allows for optimized large-span pole spacing. It helps reduce infrastructure investment and accelerates the overall project construction schedule.
• Enhanced Network Safety: The integrated, thickened cross-linked polyethylene (XLPE) insulation layer isolates the inner conductor from external contact with branches, birds, and floating debris, effectively reducing the incidence of short circuits, grounding faults, and surface leakage, thus improving the operational reliability of roadside lines, residential areas, and forest power distribution networks.
• Anti-aging and Long Service Life: Utilizing advanced cross-linking manufacturing processes and high-purity raw material formulations, the cable exhibits superior anti-aging and structural fatigue resistance. Long-term outdoor exposure does not lead to rapid insulation degradation, ensuring stable electrical and mechanical performance throughout its design life.
• High Versatility and Compatibility: A complete range of standard voltage and cross-sectional specifications covers most medium-voltage engineering needs worldwide. Outer diameter and structural parameters are compatible with mainstream international overhead suspension clamps, tensioning joints, and connection hardware, meeting project requirements without additional modification costs.

• Strict Raw Material Selection and Comprehensive Routine Testing: We use high-purity aluminum rods and top-grade XLPE compounds from qualified raw material suppliers. Each batch undergoes rigorous testing, including power frequency withstand voltage, insulation resistance, partial discharge detection, mechanical tensile properties, and thermal aging testing. We can provide complete certification documents and third-party inspection reports for project bidding, technical review, and final acceptance.
• Customized Engineering Solutions Support: Our professional technical team offers free current-carrying capacity testing, overhead line sag and tension parameter references, model selection optimization, and laying scheme consultation. We can customize cable formulations based on local climate and terrain conditions, including coastal corrosion resistance, high-altitude low-temperature performance, and tropical high-temperature aging characteristics.
• Global Export-Grade Packaging and Stable Supply: All cables are packaged in export-standard steel-wood reels, providing moisture, shock, and pressure protection, suitable for long-distance sea and land transport. We support bulk custom production, flexible international trade terms, and stable delivery cycles to meet the procurement pace of global power companies, EPC contractors, and regional distributors.
• Optimized Lifecycle Value: Direct factory supply ensures reasonable procurement costs. With low transmission loss, a stable service life of over 30 years, and low daily network maintenance investment, this cable reduces repeated replacements and daily operating expenses, bringing reliable long-term economic benefits to power engineering projects.

1. Engineers should select the appropriate voltage rating and conductor cross-sectional area based on the system's rated voltage, calculated load current, and laying span; verify current-carrying margin and temperature rise margin during the initial design phase.
2. For coastal areas, chemical industrial zones, and regions with consistently high humidity, enhanced salt spray and corrosion-resistant customized versions should be selected to adapt to harsh atmospheric conditions.
3. During installation, the specified minimum bending radius should be followed; avoid forced bending, dragging, and excessive compression to prevent hidden insulation damage and internal electrical defects.
4. Avoid on-site laying at ambient temperatures below -20°C; for areas with significant seasonal temperature differences, allowances for reasonable expansion and contraction should be made to control line sag and tension within standard ranges.
5. Use matching aluminum alloy overhead fittings, clamps, and connectors with consistent material properties to avoid contact potential differences and abnormal heating, ensuring the coordinated and safe operation of the entire line system.
6. For mountainous valley crossings and long-span laying scenarios, perform professional sag and tension calculations to match the cable's mechanical properties with the tower bearing design, thereby maintaining long-term network stability.