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A pilot using water pressure to install 2 150 kV cable circuits in a horizontal directional drilling

The space required and available to install cables in a cable trench using open excavation is becoming less and less available. TenneT will therefore increasingly want to install cables using long-length directional drilling. The desired longer lengths of directional drilling will exceed 2000 metres. Traditionally, the cables are then pulled in with a winch wire. When pulling in the cables, the maximum tensile forces and the so-called side-wall pressure on the cables must not be exceeded, this influence the maximum cable length. Another possible installation method could be water pressure to float in cables. To build up experience a pilot was started.

Jacco Smit, Roy Zuijderduin, Willem Griffioen