ECKABEL WINDFLEX XS 20KV: Medium Voltage Wind Turbine Cables Engineering Specifications and Installation Best Practices

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The ECKABEL WINDFLEX XS 20KV series is specifically designed for wind turbines, ensuring reliable medium-voltage power transmission under medium mechanical stress.

These halogen-free cables are suitable for installation in fixed, free-hanging, or free-movable configurations, capable of handling operational temperatures ranging from -40°C to +90°C.

Key features include:

• Halogen-free construction, reducing environmental impact.

• Exceptional flexibility, enabling twistable installation for free-hanging operations.

• Compatibility with global standards such as DIN VDE 0250 and IEC 60840.

This cable addresses the challenges of energy transmission in harsh environments, offering durability, safety, and efficiency for wind energy applications.

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Technical Construction and Design

Core Construction

The WINDFLEX XS 20KV cable employs a robust construction:

• Copper conductor: Class 5 fine-wire strands per IEC 60228 for enhanced flexibility and conductivity.

• Three-phase configuration with PE cores in the outer interstices.

​Advanced semi-conductive layers to ensure stability:

Inner layer: Semi-conductive EPR for consistent electrical performance.

Outer layer: Semi-conductive EPR for added insulation integrity.

• High-grade HEPR rubber insulation to withstand thermal and mechanical stresses.

Cable Architecture

• Core arrangement available in configurations from 3x70mm² to 3x240mm².

• EPR inner and outer sheaths for environmental resistance.

• Compact dimensions and lightweight design for easier handling and installation.

Specification	Value Range
Conductor Diameter (mm)	10.7 - 21.5
Nominal Outer Sheath (mm)	3.2 - 4.0
Max Cable Diameter (mm)	54 - 77.5
Cable Weight (kg/km)	4835 - 12830

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Performance Specifications

Electrical Parameters

• Voltage rating: 12/20 (24) kV.

• Test voltage: 42 kV, meeting high safety standards.

• Superior current-carrying capacity per IEC 60364-5-52.

• Optimized for short-circuit conditions, ensuring safety and durability.

Thermal Characteristics

• Operating range: -40°C to +90°C, making it ideal for extreme weather.

• Max conductor temperature: 90°C during operation and 250°C under short-circuit conditions.

• Minimal thermal degradation over time, ensuring long service life.

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Mechanical Properties and Installation

Mechanical Specifications

The cable is engineered for durability and flexibility:

• Tensile strength:
  • During installation: 70 N/mm².
  • Permanent operation: 15 N/mm².

• Torsional stress: ±100°/m, supporting movement in wind turbines.

• Bending radius:
  • Fixed: 6 × cable diameter.
  • Flexible: 10 × cable diameter.

 

Installation Guidelines

Proper installation ensures peak performance:

• Use appropriate handling tools to avoid conductor damage.

• Secure cables with adequate supports in free-hanging setups.

• Observe recommended temperature ranges during laying and operation.

• Ensure proper termination and jointing techniques for reliability.

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Environmental and Safety Features

Environmental Protection

• Halogen-free and low-smoke design reduces toxic emissions during fire.

• Resistant to UV, ozone, chemicals, and oil, making it suitable for outdoor installations.

Safety Compliance

Certified to meet stringent safety standards, including:

• Fire resistance: DIN EN 60332-1-2.

• Minimal smoke emission and environmental impact.

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Application-Specific Considerations

Wind Turbine Integration

• Ideal for nacelle installations, offering flexibility and durability.

• Accommodates twisting and movement within wind towers.

• Supports vibration management for extended lifespan.

System Design

• Enables efficient power transmission with minimal voltage drop.

• Ensures compliance with EMC and grounding requirements.

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Common Challenges and Solutions

Installation Challenges

• Vertical weight management for tall wind turbines.

• Termination in confined nacelle spaces.

• Addressing thermal expansion during installation.

Operational Challenges

• Resistance to thermal cycling and mechanical stress.

• Maintenance access in harsh weather conditions.

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Testing and Quality Assurance

• Factory testing: High-voltage tests, partial discharge checks, and dimensional verification.

• Post-installation testing: Phase identification and voltage withstand checks.

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Maintenance and Monitoring

• Regular inspections and testing ensure longevity.

• Troubleshooting guides for emergency repairs and diagnostics.

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Conclusion

The ECKABEL WINDFLEX XS 20KV cable combines cutting-edge design with compliance to international standards, ensuring reliable power transmission for wind turbines.

Its flexibility, environmental safety, and superior performance make it a top choice for wind energy professionals worldwide.

Contact us for more information or to request a quote!

Note: This is just part of the standard parameters of our products. Please contact our Engineer if you need more. And the information contained within this webpage is for guidance only and is subject to change without notice or liability. All dimensions and specifications are nominal and are subject to normal manufacturing tolerances. All pictures shown are for illustration purposes only. The actual product may vary. All the information is provided in good faith and is believed to be correct at the time of publication.

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