JKLGYJ is a steel-cored aluminum stranded XLPE insulated medium-voltage overhead cable, featuring a high-strength galvanized steel core, tightly stranded aluminum outer conductor, and high-performance cross-linked polyethylene insulation. It covers mainstream medium-voltage levels such as 6/10kV, 12/20kV, and 26/35kV, and is specifically designed for long-span overhead transmission, installation in complex terrain, and power grid construction in areas susceptible to wind and snow.

Unlike pure aluminum JKLYJ and pure copper JKYJ overhead cables, JKLGYJ employs a composite ACSR structural design. Its internal steel core provides superior mechanical tensile strength and sag resistance, while the outer aluminum conductor handles power transmission. Combined with UV-resistant and heat-resistant XLPE insulation, this cable integrates high tensile strength, low loss, excellent thermal stability, strong wind and ice adaptability, and outdoor weather resistance, fully meeting the evaluation standards of global power design engineers, power procurement departments, EPC contractors, and cross-border project investors. They are particularly interested in long-span laying capabilities, adaptability to complex climates, structural stability, and full-cycle operational reliability.

Extruded, monolithic cross-linked polyethylene (XLPE) insulation effectively isolates external environmental interference, reduces line exposure risks, optimizes overhead corridor layout, and alleviates daily grid operation load. JKLGYJ products are manufactured in strict accordance with international electrical standards and power industry specifications, possessing a complete range of specifications, stable composite structure formulations, and broad compatibility with global overhead line suspension, tensioning, and connection hardware.

It performs stably under various operating conditions, including valley crossings, long-span river crossings, high-altitude wind zones, northern snow and ice areas, strong wind environments along the coast, and power distribution networks in forest and mountainous areas. It has become the preferred standard solution for global medium-voltage trunk line construction, power supply in remote areas, power transmission lines for new energy power plants, power grid transformation in areas prone to wind and ice disasters, and large-scale rural electrification projects.

• IEC 60840, IEC 60287, IEC 60502-2
• CE Low Voltage Directive Certification
• RoHS Hazardous Substance Restriction
• 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 Power Distribution Lines

The project complies with international standards for calculating wind loads, ice loads, sag and tension for overhead power lines, design specifications for long-span laying in mountainous areas, and technical requirements for disaster-resistant power grid construction. All electrical, mechanical, and aging indicators are certified by third parties and are applicable to project bidding and acceptance in Asia, Africa, the Middle East, Latin America, and Southeast Asia.

Model Definition

JKLGYJ

J

Overhead

K

Insulation

L

Aluminum Core

G

Steel Core

YJ

XLPE Insulation

Rated Voltage

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

Conductor Structure

Inner galvanized steel core + outer concentric stranded aluminum core (ACSR composite structure)

Conductor Cross-section

Aluminum core cross-section 16mm²–400mm², steel core specifications can be customized

Insulation Material

High-density cross-linked polyethylene (XLPE), modified to have UV resistance, ozone resistance, tracking resistance, and low-temperature brittleness resistance

Continuous Allowable Operating Temperature

90℃

Short-circuit Heat Resistance Temperature

250℃, short-circuit duration 5 seconds

Minimum installation temperature

-20℃

Minimum permissible bending radius

≥15 times cable outer diameter

Mechanical properties

High overall tensile strength, low sag, strong resistance to wind and ice coating loads

Dielectric properties

Low partial discharge value, high insulation resistance, stable breakdown strength under long-term electrical stress

Structural stability

Tightly stranded composite, not easily loosened under long-term outdoor wind and ice conditions

Design service life

Over 30 years under standard installation and normal natural conditions

Customization options

Steel core ratio adjustment, increased insulation thickness, special anti-icing coating formula, coastal anti-corrosion version, and non-standard cross-sections can all be customized.

• Medium-voltage trunk and branch lines for power grid upgrades in areas prone to windstorms, ice storms, and mountainous disasters.
• Valley crossings, river crossings, and long-span overhead transmission projects where ordinary aluminum cables cannot meet tensile strength requirements.
• Medium-voltage outgoing and grid-connected lines for wind farms and photovoltaic power stations in remote and complex terrains.
• Long-distance overhead power supply projects in remote rural areas, plateau pastoral areas, and islands.
• Overhead distribution networks with high load-bearing requirements in cold northern regions and snow-covered areas.
• Medium-voltage overhead power supply lines for large industrial parks, mining areas, and remote resource development bases.
• Large-scale overhead lines in forested mountainous areas and suburban areas requiring large pole spacing and reduced tower count.

• Composite ACSR Structure, Ultra-High Tensile Strength: The built-in galvanized steel core significantly enhances overall tensile strength, far exceeding that of pure aluminum overhead cables. This effectively controls line sag in long-span installations, allowing for greater tower spacing, reducing the total number of support poles, and lowering infrastructure layout investment for projects.
• Superior Wind and Ice Load Resistance: The steel-aluminum composite structure possesses extremely strong resistance to wind pressure vibration, ice loads, and external mechanical impacts. Even in strong winds, blizzards, and severe cold weather, it maintains a stable structural shape, avoiding line swaying, deformation, and open-circuit faults common in ordinary cables.
• Low Transmission Loss and Stable Current-Carrying Performance: The outer high-purity stranded aluminum conductor maintains low resistivity and stable current-carrying efficiency. Combined with high-quality XLPE insulation, it maintains low dielectric loss and stable temperature rise under long-term full load and seasonal temperature changes, ensuring efficient and economical operation of power lines.
• Superior Low-Temperature and Weathering Resistance: The improved XLPE insulation formula enhances low-temperature toughness, making it less prone to cracking and embrittlement even in frigid environments. It also boasts excellent resistance to UV radiation, ozone, and heat aging, enabling it to withstand year-round outdoor environments without performance degradation.
• Optimized Layout Flexibility for Complex Terrain: With its high tensile strength, JKLGYJ is perfectly suited for long-span installations in mountainous areas, valleys, rivers, and vast wilderness regions. It simplifies line design constraints and increases the flexibility of overhead line selection in complex terrains.
• Safe Insulation and Low Failure Rate: The enclosed XLPE insulation prevents short circuits and leaks caused by tree branch contact, wildlife interference, and floating debris. It improves the safety of lines in mountainous forests and densely populated suburban areas and reduces daily operational inspection workload.
• Universal Accessory Compatibility and Easy Installation: Standard outer diameter and structural parameters are compatible with mainstream global overhead suspension clamps, tensioning fittings, insulation joints, and connecting accessories. No special custom parts are required, accelerating project procurement and improving on-site construction efficiency.

Why Choose Our JKLGYJ Medium Voltage Cables

• Strict Raw Material Selection and End-to-End Quality Control: We use hot-dip galvanized high-strength steel wire and high-purity aluminum rods, combined with premium weather-resistant XLPE raw materials. Each batch undergoes withstand voltage testing, insulation resistance testing, tensile strength testing, sag simulation testing, and thermal aging testing. Complete factory reports and third-party certification documents are available for bidding and project acceptance.
• Professional Engineering Customization and Technical Support: Our technical team provides free current-carrying capacity calculations, wind and ice load parameter consultation, large-span sag tension design guidance, and model selection advice. We can adjust the steel core ratio, insulation formula, and structural dimensions according to local wind speed, ice thickness, span, and climate conditions to meet personalized engineering design needs.
• Export Standard Packaging and Stable Global Supply: Packed in internationally standard steel and wooden drums, providing moisture-proof, shockproof, and pressure-resistant protection, suitable for long-distance sea and land transportation. We support large-volume order production, flexible trade terms, and stable delivery cycles, serving global utilities, EPC contractors, engineering distributors, and remote infrastructure projects.
• Excellent life-cycle economic benefits: Direct sales from the manufacturer control reasonable procurement costs; high tensile strength reduces investment in tower infrastructure; a service life of over 30 years reduces replacement frequency; stable operation reduces daily maintenance costs. For projects with long spans and in disaster-prone areas, its comprehensive life-cycle value is superior to that of ordinary aluminum overhead cables.

Key Project and Procurement Guidelines

• For long-span crossings, complex mountainous terrain, areas with strong winds and thick ice, JKLGYJ type steel stranded wire should be prioritized; select an appropriate core ratio and conductor cross-sectional area based on the span, local wind and ice levels, and design load current.
• In coastal areas with salt spray and industrial corrosion, select a hot-dip galvanized reinforced steel core version with customized anti-corrosion cross-linked polyethylene (XLPE) to delay metal oxidation and insulation aging.
• During handling and installation, minimum bending radius requirements should be followed; avoid severe bending, dragging, and squeezing to prevent insulation damage and potential electrical risks.
• Laying work must not be carried out when the ambient temperature is below -20℃; allow sufficient expansion margin to cope with temperature differences in cold seasons and prevent excessive line tension.
• Overhead hardware matching the steel-cored aluminum stranded wire (ACSR) should be used for support accessories to avoid poor contact and localized overheating, ensuring long-term stable operation of the entire line.
• For ultra-long span laying, professional sag and tension calculations are required to coordinate the tensile properties of the cable with the tower bearing design, thereby maintaining the safety and stability of the line under extreme weather conditions.