System design

Underground cables have been designed to assist transmission projects to transmit power through sensitive areas. When the sensitive area has been crossed, cost minimization means that the power is usually fed back into an overhead line system. This transition happens through special cable to line jointing systems.

In some areas, the particular sensitivity is associated with the presence of magnetic fields around overhead lines and underground cables. In these areas, cables offer a particular advantage as they can be installed with shielding which keeps fields to a very low level. Consequently cables can cross areas where overhead lines would be quite unacceptable, such as busy city streets or housing areas.

Follow the links below for more information on how systems are designed:

Design flexibility from magnetic field shielding
The interface between underground cables and overhead lines