Nexans tests SF6-free 525 kV cable connection system successfully

NEXANS has successfully completed an electrical type test for 525 kV DC SF6 gas-free cable terminations, marking a significant advancement in grid technology for the company. This achievement provides a safer and more sustainable solution for connecting High Voltage Direct Current (HVDC) cables, aligning with Nexans' goal to "electrify the future."

The growing demand for electricity, particularly for HVDC connections in offshore and onshore applications, necessitates the development of low-carbon grid solutions. In response, Nexans has developed a comprehensive 525 kV HVDC cable system incorporating SF6-free accessories. These include a dry-type Gas Insulated Switchgear (GIS) cable sealing end, a g3 gas-filled GIS cable sealing end, and an outdoor composite (Air-Insulated Switchgear – AIS) cable sealing end.

The tests were conducted according to international standards (CIGRE TB 852 and IEC 62895) at Nexans' High Voltage laboratory in Calais, France, under the certification of an independent third party. Nexans states that the successful completion proves the technical feasibility of SF6-free HVDC accessories, positioning the company at the forefront of developing advanced grid technologies.

Eliminating SF6 gas in high-voltage cable systems is expected to significantly reduce environmental impact. Nexans indicates these solutions can lower greenhouse gas emissions by over 99% and contribute to more sustainable power grids. Beyond environmental benefits, the SF6-free accessories are also anticipated to improve reliability and reduce maintenance requirements.