For NKT, the repair project comprised fault location, civil works, repair of the power cable, Time Domain Reflectometry (TDR) measurements after the repair, and a cable dissection and analysis currently under development.
June 21, 2021
NKT has finalized the repair operation of the Kontiskan-1 interconnector between Denmark and Sweden.
The interconnection of power grids is central to the exchange of renewable energy across Europe, and for Denmark and Sweden the Kontiskan-1 power cable system is part of the infrastructure connecting the power grids of the two countries. When a fault was detected on the 285 kV HVDC power cable system, the Swedish grid operator Svenska Kraftnät reached to NKT for a quick repair of the power cable. NKT found the fault caused by external impact close to the Billdal transformer station in Gothenburg, Sweden, and the repair operation was successfully completed at the end of March.
In case of unpredicted cable faults close collaboration, time and operational efficiency are essential to power grid operators like Svenska Kraftnät to ensure minimum downtime.
Also Read: Prysmian Group Awarded USD 900 Million SOO Green HVDC Link Project.
The Kontiskan-1 power cable system was originally installed between Denmark and Sweden in 1969 to enable the exchange of energy between the Nordic countries and the rest of Europe. In 1988 a second interconnector, the Kontiskan-2, was inaugurated adding to the current power rating of 550 MW.
