NKT has finalized the repair of the 285 kV HVDC power cable system Kontiskan 2 that connects the power grids of Sweden and Denmark.
A press release said that NKT was awarded the repair contract after the Kontiskan 2 interconnector—operated by Svenska Kraftnät and Energinet—suffered a fault due to external impact at the end of January 2022. Roughly eight weeks after the fault occurred, the 285 kV mass impregnated (MI) HVDC power cable system was back in full operation. The actual repair operation took only 12 days.
NKT performed the initial fault finding from shore identifying that the damage was located offshore. The damaged cable section was located 33 km from the converter station in Billdal, Sweden, after further pinpointing with a third-party vessel. NKT completed the repair operation within only 12 days after the mobilization of a third-party repair vessel. Following the operation, NKT buried the power cable at safe water depth to mitigate the risk of external impact.
The Kontiskan 2 was energized shortly after the repair bringing the power cable connection back in full operation. The interconnector was installed in 1988 as an addition to the Kontiskan 1 from 1969 to support the exchange of energy between the Nordic countries by connecting the national power grids in Denmark and Sweden.
“Once again, we demonstrated that we are among the fastest companies in the market when it comes to offshore repairs,” the release said.