Type YHKGXFoyn Mining Cable 0.6/1 kV

Power cable, mining, with copper working conductors, in an individual radial field screen, with cross-linked polyethylene insulation, in a PVC sheath, armoured with round steel wires, in a flame retardant PVC sheath

The Type YHKGXFoyn Mining Cable 0.6/1 kV is a robust power cable designed specifically for underground mining applications.

It is intended for use in mining installations where the rated voltage does not exceed 1 kV, and it is suitable for both non-methane and methane environments (with appropriate explosion hazard classifications).

Key Construction Features

• Conductors:

  • Made of copper, these are multi-stranded, round conductors that are compressed (Class 2 per EN 60228).

  • The working conductors are twisted around a central core (which can be a copper wire or strand).

• Insulation:

  • Uses cross-linked polyethylene (XLPE, type DIX 5) that offers excellent thermal and electrical properties.

  • The insulation color is natural.

• Screening:

  • Each conductor has an individual radial (around the conductor) semi-conductive screen.

  • This screen can be applied either as an extruded tape or as a combined layer that includes copper wire and copper tape.

• Inner Sheath (Filler):

  • A non-vulcanized rubber or “tyre-type” PVC (polwinit) layer fills the cable, providing shape and additional protection.

• Inner Protective Layer:

  • A PVC sheath (type DMV 6) covers the insulated conductor and its screen.

• Armour:

  • The cable is mechanically protected by an armour made of round, galvanized steel (FeZn) wires.

• Outer Sheath:

  • A flame-retardant PVC outer sheath (also type DMV 6) provides further mechanical and environmental protection.

  • The outer sheath is yellow.

• Standards:

  • The cable is built to comply with the Polish standard ZN-TF 205:2006 and related specifications.

Performance Characteristics

• Temperature Ratings:

  • Operating Temperature: Up to +90 °C for the conductors.

  • Short-Circuit Temperature: Can reach up to +250 °C during fault conditions.

  • Ambient Installation Temperature:

    • Down to -30 °C for permanently laid cables.

    • Down to -50 °C when laying without pre-heating.

• Mechanical Flexibility:

  • The minimum bending radius is 12 times the cable’s outer diameter (12 × D).

• Electrical Testing:

  • The cable is tested at 4 kV AC (50 Hz) for 5 minutes to ensure its insulation integrity.

• Flame Retardancy:

  • It meets international flame propagation standards (IEC 60332-1-2 and IEC 60332-3-24C).

• Tensile Strength:

  • The maximum tensile strength is calculated as 50 times the sum of the cross-sectional areas of the conductors (50 × S).

Available Sizes and Properties

The cable is available in various sizes (for example, 3×16, 3×25, 3×35, etc.), with each size specifying:

• Insulation Thickness (Nominal)

• Inner Sheath (Powłoka) Thickness

• Armour (Osłona) Thickness

• Approximate Overall Diameter

• Approximate Weight (kg per km)

• Maximum Conductor Resistance at 20 °C

In addition, tables provide details on:

• The current-carrying capacity (ampacity) of the cable for different conductor sizes.

• Electrical properties such as unit inductance and unit inductive reactance.

Installation Considerations

• Applications:

  • These cables are engineered for underground mining power networks and are designed to perform in harsh conditions, including in areas with potential methane or coal dust explosion hazards.

  • The robust armouring makes them suitable for installation in vertical shafts and inclined workings (over 45°).

• Current Capacity Adjustments:

  • When several cables are installed together (for example, stacked on support structures), their current-carrying capacity must be derated using specified correction factors.

  • Stacking Factor (Kg):

    • 1 cable: 1.00

    • 2 cables: 0.93

    • 3 cables: 0.90

    • 6 cables: 0.87

    • 9 cables: 0.86

  • Ambient Temperature Factor (Kt):

    • For ambient temperatures above 25 °C, the cable’s capacity is reduced. For example:

      • 30 °C → 0.96

      • 35 °C → 0.92

      • 40 °C → 0.88

      • 45 °C → 0.83

      • 50 °C → 0.78

      • 55 °C → 0.73

• Packaging:

  • Standard packaging is typically 500 or 1000 meters per drum, with options available for other lengths or packaging types.

Summary

The Type YHKGXFoyn Mining Cable 0.6/1 kV is a specially engineered, flame-retardant, and mechanically robust power cable. Its design—with copper conductors, XLPE insulation, individual screens, and steel wire armour—ensures it meets the demanding conditions found in underground mining.

With certifications according to current standards and a range of available sizes, it provides a reliable solution for mining power installations, even in explosive or high-risk environments.