05/05/2021 – Cable manufacturing

Nexans achieves electrical Type Test for 525kV DC GIS cable sealing end

Nexans, in cooperation with Siemens Energy, carried out the electrical type testing of a 525kV DC gas-insulated switchgear (GIS) according to CIGRE TB 496.


GIS type ends constitute an interesting component in the HVDC links. © Nexans


In the high-voltage direct current (HVDC) market, cables with cross-linked polyethylene (XLPE) insulation have gained acceptance over the last decade, enabling the deployment of innovative power grids in Europe and worldwide. The Nexans ecosystem includes world-class partners who share our values and work together to continuously deepen our ability to stay ahead of market demands. GIS type ends constitute an interesting component in the HVDC links due to the flexibility and compaction they allow in the connection of cables of different structures, especially in congested spaces such as an offshore platform. It is also suitable for use in back-to-back mode, thus constituting a mixed joint (e.g. between cables of different technologies).

 Nexans developed a dedicated GIS cable sealing end for a 525kV DC XLPE cable system. The studies on electro-thermal aspects of the interface resulted in an optimized accessory design. The solution consists in a Nexans GIS termination plugged in a Siemens Energy DC GIS enclosure both compliant with IEC 62271-209 standards dimensions.

 The validation of the solution has been successfully completed through an electrical 525kV DC VSC Type Test according to CIGRE TB 496. The test was accomplished in Nexans Calais high voltage laboratory under the certification of an independent third-party. This technologic breakthrough allows the company to offer competitive products for the deployment of HVDC links with direct connection to DC GIS.

Nexans is working towards a new world of electrification: safer, more sustainable, renewable, decarbonised and accessible to everyone - creating new opportunities, technologies and behaviours for a better future for all.