From both ecological and economic aspects - territ® pays off

Kabeltrommel

territ®, the thermally stabilised lean concrete from bamat, has been developed specifically as backfill for underground high and extra-high voltage cables. Over time, moisture in the soil will cause it to harden and form a solid layer, which gives the soil long-term protection against irreversible desiccation.
Despite the most advanced cable technology, heat is still dissipated into the ground from high voltage lines. Taking the useful life of VPE insulation into account, the operating temperature may not exceed 90°C maximum. The cable surface temperature depends on various factors here. On the one hand it depends on the load on the cable, to be specific the amount of electricity transmitted through the cable. On the other hand, the depth at which the cable is laid, cable spacing, thermal conductivity of the insulation material, thermal conductivity of the soil and bedding material have a crucial effect on resistivity.
From the thermal aspect, a humid environment is more conducive than a dry one. This is influenced to a high degree by the choice of backfill used. The patented territ® sand and cement mix from bamat is effective in combating soil desiccation, resulting in lower operating temperatures. This way loss of energy is prevented over the long term while maintaining steady transmission capacity.
territ® backfill from bamat ensures short amortisation times and pays off in three respects:

  • Less capital outlay: you already save costs in the construction phase. Closer cable spacing makes narrower routes possible.
  • Lower operating costs: you avoid unnecessary loss of energy, resulting in increased current-carrying capacity.
  • Improvement in the environmental balance sheet: you combat the irreversible desiccation of the soil in the area surrounding the cable consistently and prevent heat-related loss of energy.

Improved current-carrying capacity and closer cable spacing - territ® maximises your cost efficiency

Kabeltrommel

110 KV
Load capacity of 110kV XLPE cables 2XS(FL)2Y 1x800RM/155 as a function of specific thermal resistance Rth with underground installation contiguous in triangle at depth of 1.5m and earthing on both sides and load factor of m=1 resp. m=0.7
Conductor temperature 90°C, ambient temperature 15°C. Additional sources of heat are not taken into consideration.

220 KV
Load capacity of 220kV XLPE cables 2XS(FL)2Y 1x1600RMS/255 as a function of specific thermal resistance Rth with flat underground installation at a depth of 1.5 m with 400mm axial phase spacing and earthing on one side and load factor of m=1 resp. m=0.7
Conductor temperature 90°C, ambient temperature 15°C. Additional sources of heat are not taken into consideration.

Optimum operating temperatures increase the transmission capacity

backfill
specific thermal resistivity
dry soil
2,5 Km/W
concrete
1,2 Km/W
backfill
specific thermal resistivity
damp soil
1,0 Km/W
territ®
<0,5 Km/W