Underground Transmission Lines

Underground Transmission Lines are more common in populated areas. They may be buried with no protection, or placed in conduit, trenches, or tunnels.

   Transmission lines are installed in a tunnel,
which enables many circuits in a limited area.

  Heat is generated when electricity flows through cables, limiting the power transmission capacity in tunnels. To increase the capacity, a tunnel cooling system can be installed. The system above circulates cold water through the tunnels.

  . Transmission line laid in a trench

   Cable snaking through underground transmission tunnel

   Cable installation of underground transmission line

   Underground transmission line tunnel

  Cross section of underground transmission line