35-CHVU 20/35kV Open-Pit Mining Trailing Cable

35-CHVU 20/35 kV Open-Pit Mining Trailing Cable

35-CHVU is a 20/35 kV trailing cable manufactured to DS 074-2004 for feeding large coal extraction machines in open-pit mines. It sits a full voltage step above the usual mine distribution range: where a 3.6/6 kV to 12/20 kV feeder ends, this is the cable that carries the supply to a dragline, shovel or large excavator at the working face.

The construction is a screened medium-voltage design with a semiconducting layer either side of the rubber insulation, a semiconducting inner sheath, and a 25 mm² concentric copper conductor before the textile tape and the outer chloroprene sheath. That concentric conductor is the earth and screen return path for the whole cable, and its rating has to be checked against the system earth-fault current, not assumed from the phase size.

• Rated voltage: 20/35 kV; test voltage 53 kV.
• Cross-sections: 3 × 50, 3 × 70 and 3 × 95 mm², each with 3 × 16 mm² earth and a 25 mm² concentric conductor.
• Short-circuit temperature: +250 °C; conductor operating temperature +90 °C.
• Duty: trailing movement, resistant to shock, pressure, abrasion and weather.

For medium-voltage mine distribution below this range see (N)TSCGEWÖU mine distribution cable, and for continuous reel duty see R-(N)TSCGEWÖU reeling cable.

35-CHVU Cable Construction

Nine-layer screened medium-voltage construction to DS 074-2004. The concentric copper conductor in position 7 is a fixed 25 mm² across all three sizes.

Conductor shape is RF. In the size table the abbreviation konc. denotes the concentric conductor, so 3 × 50 + 3 × 16 + 25 konc. means three 50 mm² phase cores, three 16 mm² earth cores and the 25 mm² concentric conductor.

35-CHVU Applications

35-CHVU is a trailing flexible cable for feeding large coal extraction machines used in open-pit mines. The cable is sufficiently resistant to shock, pressure, abrasion and weather for surface working conditions.

• 20/35 kV supply to draglines, shovels and large excavators at the working face.
• Trailing routes along benches where the cable is dragged and repositioned as the machine advances.
• Surface installations exposed to weather, abrasion, pressure and impact.
• Feeds where supply distance and voltage drop make 20/35 kV the correct system voltage rather than a lower mine distribution level.

Application boundaries

This is a trailing construction rather than a high-speed continuous reeling cable. Where the machine uses a reel, the drum geometry, winding layers, speed and pull govern the selection. The tabulated bending radius is the minimum for the installed route.

Related mining feeder references

Compare (N)TSCGEWÖU mine distribution cable for 3.6/6 kV to 12/20 kV semi-fixed distribution, R-(N)TSCGEWÖU for reel duty and (N)TSCGEWOEU for continuous crane reeling.

35-CHVU Specifications

35-CHVU size and electrical table

All three sizes are available to order. Current capacity is the free-in-air value and must be derated for the installed condition. Dimensions and weights are nominal values.

35-CHVU Standards, Approvals and Order Documentation

Approvals

Order package

State the machine and its rating, system voltage and earthing arrangement, supply distance and required voltage drop, route profile, whether the cable is trailed or reeled, drum data if applicable, termination type, required drum lengths and any project inspection or documentation scope.