Optimized screen connection for 72 kV offshore wind farm connections with smooth welded aluminum sheath (SWAS) cables

Abstract

High-voltage cable accessories have the task to re-build the different layers of a high-voltage power cable while simultaneously providing the connection to other electrical components. The outer part of the power cable - the metallic sheath - is covered by a connection arrangement. This connection device has to be adopted on each screen design in order to allow an optimum screen current flow. This article shows the current status of this connector technology being used for high-voltage cables with smooth welded aluminium sheath (SWAS) for the use in offshore windfarms. The paper describes the physical characteristics of the screen connections and highlights the most important parameters to consider to ensure reliable operation. These include contact resistance, ampacity and installation. In addition, testing of the connection technology on SWAS cables was carried out and the results are compared with simulation results. Finally, future developments and challenges are summarized.