11kv 70mm2 Al/Sc/XLPE/Sc/Cut/PVC 3+1 Aerial Bundeled Conductor Cable

Electrical Efficiency: Every component, from the Conductor Material to the insulation layers, is optimized to minimize resistance and dielectric losses. The stranded Aluminum Conductors and XLPE insulation work in tandem to ensure maximum power transfer with minimal energy dissipation.

Mechanical Durability: The cable’s structure is engineered to withstand the rigors of overhead installation, including wind loads, temperature fluctuations, and mechanical stress during handling. The combination of Stranded Conductors and flexible sheathing ensures long-term structural integrity.

Operational Safety: Multiple protective layers, including semiconductor screens and flame-retardant sheathing, are integrated to prevent electrical hazards, reduce fire risks, and shield against environmental contaminants.

Flexibility: The stranded design allows the conductor to bend more easily than a solid conductor, reducing installation stress and enabling routing around obstacles.

Current Distribution: Stranding ensures uniform current distribution across the conductor cross-section, minimizing the skin effect at 50/60Hz frequencies.

Mechanical Strength: The twisted structure distributes mechanical stress evenly, increasing tensile strength (minimum 110MPa) and resistance to fatigue failure.

Inner Semiconductor Layer: Applied directly over the aluminum conductor, this layer is composed of carbon-loaded XLPE with a thickness of 0.5-0.8mm. Its primary function is to eliminate air gaps between the conductor and insulation, which could cause partial discharges. By maintaining a uniform potential gradient, it prevents localized electrical stress that could degrade the insulation over time.

Outer Semiconductor Layer: A 0.5mm thick carbon-loaded XLPE layer applied over the insulation, this component serves as a transition between the insulating XLPE and the metallic screen. It ensures a smooth distribution of electrical stress at the insulation’s outer surface, reducing the risk of breakdown and enhancing the cable’s dielectric performance.

Dielectric Strength: Exceeding 25kV/mm, ensuring reliable insulation at 11kv and providing a substantial safety margin.

Temperature Resistance: Rated for continuous operation at 90°C, with short-term overload capability up to 130°C for 5 seconds, making it suitable for fluctuating load conditions.

Chemical Resistance: Impervious to moisture, acids, alkalis, and most industrial solvents, ensuring performance in harsh environments.

Aging Resistance: Resistant to oxidation and UV degradation, with a projected service life exceeding 40 years under normal operating conditions.

Electromagnetic Shielding: It contains the electromagnetic field generated by the current-carrying conductors, preventing interference with nearby communication lines and sensitive equipment.

Fault Current Path: In the event of insulation failure, the screen provides a low-resistance path for fault currents to flow to ground, triggering protective devices (fuses or circuit breakers) and minimizing downtime.

Mechanical Protection: Resistant to abrasion, impact, and penetration by rodents or insects, safeguarding the inner components during installation and operation.

Weather Resistance: UV stabilizers prevent degradation from sunlight exposure, while the material’s low water absorption (less than 0.5% after 24 hours immersion) ensures performance in rainy or humid conditions.

Flame Retardancy: Complies with IEC 60332-1 for vertical flame spread, reducing fire risks in case of short circuits or external ignition sources.

Chemical Resistance: Resistant to oils, greases, and common industrial chemicals, making it suitable for industrial zones.

Power Frequency Withstand Test: 24kV applied for 5 minutes without breakdown, simulating overvoltage conditions.

Impulse Withstand Test: 75kV (1.2/50μs impulse) applied 10 times positive and 10 times negative, verifying protection against lightning strikes and switching transients.

Partial Discharge Test: Less than 10pC at 1.73 times the rated phase-to-ground voltage, confirming minimal internal discharges that could degrade insulation.

Free Air Installation (30°C ambient): 245A continuous current

Duct Installation (30°C ambient): 210A continuous current

Direct Burial (25°C soil): 195A continuous current

Overall Tensile Strength: Minimum 10kN, sufficient to withstand installation tension and wind loads in Overhead Applications.

Conductor Tensile Strength: 110-130MPa, ensuring the aluminum strands do not break under stress.

Minimum Bending Radius: 12 times the cable outer diameter (typically 120mm) during installation, and 20 times (200mm) during operation, preventing insulation damage from sharp bends.

Elongation at Break: >15% for conductors and >200% for XLPE insulation, indicating flexibility under stress.

Impact Resistance: Withstands 5J impact energy using a 2kg hammer without insulation penetration, tested per IEC 60811-1-2.

Abrasion Resistance: Survives 10,000 cycles of abrasion with a 5N load using a 0.5mm steel wire, ensuring durability during installation and in service.

Operating Temperature Range: -40°C to +90°C continuous; -50°C to +130°C short-term.

UV Resistance: Passes 1000-hour exposure to UVB-313 lamps at 60°C with less than 20% loss in tensile strength, ensuring outdoor longevity.

Ozone Resistance: Unaffected by ozone concentrations up to 100ppm, critical for industrial areas with high ozone levels.

Water Immersion: Insulation resistance remains >1000MΩ·km after 1000 hours immersion at 90°C, confirming moisture barrier effectiveness.

Acid Resistance: No visible damage after 1000 hours exposure to 5% sulfuric acid solution.

Alkali Resistance: Unaffected by 10% sodium hydroxide solution for 1000 hours.

Salt Spray Resistance: Copper screen shows less than 5% corrosion after 500 hours salt spray testing per ASTM B117, ensuring performance in coastal areas.

Residential Neighborhoods: Installed on low-profile poles or building facades, connecting distribution transformers to residential clusters. Its insulated design eliminates the risk of accidental contact, enhancing public safety.

Commercial Districts: Routes power to shopping centers, office buildings, and street lighting systems. The PVC Sheath’s flame retardancy minimizes fire risks in crowded areas.

Historical Areas: Its compact design and neutral color (typically black or gray) make it visually unobtrusive, preserving the aesthetic of heritage zones.

Village Electrification: Connects remote communities to the main grid, withstanding harsh conditions such as extreme temperatures and heavy rainfall.

Agricultural Applications: Powers irrigation systems, grain processing facilities, and farm machinery. Its chemical resistance protects against fertilizers and pesticides.

Mountainous Regions: Flexible design accommodates steep terrain and uneven pole spacing, reducing installation challenges.

Industrial Parks: Distributes power to factories, warehouses, and logistics centers, handling the high starting currents of industrial machinery.

Mining Areas: Resistant to dust and vibration, making it suitable for powering mining equipment and processing plants.

Renewable Energy Integration: Connects small-scale wind turbines or solar farms to the grid, withstanding the variable output characteristics of renewable sources.

Route Survey: Identify obstacles (trees, buildings, existing utilities) and calculate span lengths to determine sag requirements.

Cable Inspection: Check for shipping damage, verify markings, and measure insulation resistance (>1000MΩ·km at 500V DC).

Tool Preparation: Use cable cutters with sharp blades to avoid conductor deformation, and crimping tools calibrated for 70mm² conductors.

Megger Test: Verify insulation resistance between conductors and ground.

Phase Continuity Check: Ensure correct phase rotation using a phase sequence meter.

Tension Verification: Recheck sag after 24 hours to account for initial creep.

Visual Inspections: Quarterly checks for:

Physical damage (cuts, abrasions, rodent bites)

Loose clamps or excessive sag

Vegetation growth near the cable

Corrosion on terminations or screen connections

Cleaning: Annual removal of dirt and debris from terminations using a dry cloth; avoid water or chemical cleaners.

Thermal Imaging: Bi-annual scanning of terminations and joints to detect hot spots (>90°C), indicating high resistance connections.

Insulation Resistance Test: Every 5 years using a 2.5kV megohmmeter; values below 100MΩ·km indicate insulation degradation.

Partial Discharge Test: Every 10 years to detect insulation defects; levels exceeding 50pC require further investigation.

Dielectric Loss Factor (tan δ): Measured at 0.5, 1.0, and 1.5 times rated voltage to assess insulation aging; an increase >0.001 indicates potential issues.

Insulation Damage: Small cuts can be repaired with heat-shrink patches; extensive damage requires section replacement.

High Resistance Connections: Re-crimp terminations using proper dies and torque; replace corroded components.

Screen Breakage: Repair with copper splice sleeves and ensure proper grounding to maintain fault current path.

Sheath Degradation: Apply UV-resistant coating to minor cracks; replace sections with severe weathering.

Load Management: Avoid continuous operation above 80% of rated ampacity to minimize thermal aging.

Environmental Protection: Install rodent guards in high-risk areas; trim vegetation to prevent abrasion.

Retrofitting: Upgrade terminations every 20 years to maintain optimal performance.