Review of high current rating insulated cable solutions

• This review paper deals with cable special solutions having high ampacities.
• These solutions are examined theoretically and practical applications are shown.
• The paper shows that current rating up to 2500 A can be reached.
• The best solution must be a compromise between capex and installation constraints.

Current rating computations for HV- and EHV-insulated cables play a crucial role in the planning phase of a new line for both an entirely underground cable link and a mixed or hybrid (cascade connection of overhead and cable line) one. The paper gives a wide overview of the technical solutions which allow very high current ratings in undergrounded insulated cables. These solutions are examined from a theoretical standpoint and practical applications are shown and explained. The paper demonstrates that in underground insulated cables, current rating up to 2500 A can be reached.