High Voltage Power Cable
State-of-the-art High Voltage (HV) and Extra-High Voltage (EHV) Power Cables designed for national grid transmission and mega-infrastructure projects. Ranging from 66kV to 220kV, featuring ultra-pure XLPE insulation, seamless radial water barriers (Corrugated Aluminum or Lead Sheath), and Milliken segmental conductors for maximized transmission efficiency.
Farwalk’s High Voltage Power Cables represent the pinnacle of electrical engineering. Manufactured in our Class 10,000 cleanroom VCV (Vertical Continuous Vulcanization) tower, we guarantee absolute purity in the XLPE insulation layer to eliminate micro-voids and prevent water treeing. These cables are the ultimate choice for bulk power transmission across vast distances, underground city ingress, and connecting major power generation plants to the grid.
• National Transmission Grids: Underground high-capacity links connecting regional substations.
• Mega Power Plants: Export cables for nuclear, thermal, and large-scale hydro generation facilities.
• Offshore/Onshore Wind Farms: High voltage export lines transmitting generated power to the main grid.
• Urban Ingress: Routing high power capacity safely beneath densely populated metropolitan areas where overhead lines are prohibited.
• International: IEC 60840 (for voltages above 30kV up to 150kV), IEC 62067 (for voltages above 150kV up to 500kV)
• Conductors: IEC 60228
• Water Penetration: IEC 60840 Annex E / IEC 62067 Annex D
• Chinese Standards: GB/T 11017 (110kV), GB/T 18890 (220kV)
*Note: IEEE and specific regional utility standards can be met upon request.*
1. Conductor: Stranded plain Copper (Cu) or Aluminum (Al). Milliken (segmental) design used for sizes ≥ 800mm² to reduce skin effect.
2. Conductor Screen: Super-smooth extruded semi-conductive layer.
3. Insulation: Super-clean, extra-thick XLPE (Cross-linked Polyethylene) applied via VCV process.
4. Insulation Screen: Extruded semi-conductive layer, firmly bonded.
5. Water Blocking (Longitudinal): Semi-conductive water swellable tapes over the insulation screen and within the conductor.
6. Metallic Sheath (Radial Water Barrier): Corrugated Aluminum Sheath (CAS), Extruded Lead Alloy, or Copper Wire Screen with Aluminum laminated tape.
7. Outer Sheath: Extruded PE (Polyethylene) or PVC with a conductive graphite coating for outer sheath testing.
• Absolute Moisture Defense: Fully water-blocked design (longitudinal and radial) ensures zero moisture ingress, critical for HV longevity.
• High Ampacity: Optimized conductor designs (including Milliken) drastically lower AC resistance and maximize current carrying capacity.
• Zero Partial Discharge: VCV tower extrusion and stringent cleanroom material handling eliminate electrical stress points.
• Extreme Durability: Corrugated aluminum sheathing provides exceptional mechanical protection against ground shifting and high lateral pressures.
• World-Class VCV Tower: Our vertical extrusion line utilizes gravity-assisted curing, ensuring perfect concentricity for ultra-thick HV insulation.
• Turnkey HV Solutions: Beyond manufacturing, we provide comprehensive routing design, link box configuration, and cross-bonding system engineering.
• Rigorous Factory Testing: Every cable length passes lightning impulse and 2.5U0 AC voltage withstand tests in our shielded high-voltage laboratory.
• Traceable Quality: From copper rod to final sheath, every centimeter is continuously monitored for X-ray thickness and dielectric integrity.
Comparison Logic: Metallic Sheath / Radial Water Barrier Selection
| Metallic Sheath Type | Weight & Flexibility | Short Circuit Capacity | Primary Application |
| Corrugated Aluminum Sheath (CAS) | Lightweight, relatively stiff | Excellent (Handles massive earth faults) | Standard for modern underground HV transmission |
| Extruded Lead Sheath (Pb) | Very heavy, good flexibility | Moderate | Areas with severe chemical pollution / petrochemical plants |
| Copper Wire + Al Laminated Poly | Lightest, highly flexible | Customizable by wire cross-section | Tunnel installations with limited space |
Global Engineering & Project Support
Our technical team is ready to discuss customized cable solutions, compliance documentation, and optimized supply chain strategies for your international projects.
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