With full responsibility for every aspect of the project, NKT specialists were able to carry out a careful and thorough planning process in late 2019.
The project execution began in February 2020 with production of the new cable and accessories. These items were subjected to rigorous sample and FAT testing. Vattenfall – who participated fully in the testing process – were particularly impressed with the comprehensive documentation NKT made available to them.
In September 2020, the old cables were drained of oil, removed along with their terminations, and recycled. The major installation tasks could then begin. Between October and November 2020, NKT staff pulled in the new cable and clamped it, sealed the cable ends, installed outdoor terminations, and prepared for later installation work at the transformer.
By December 2020, the new transformer was in place and ready to receive the GIS terminations. This phase was completed in January 2021. To conclude the technical delivery, a sheath test was carried out at the beginning of February 2021 followed by a “walk-through” with Vattenfall on site. The new system was then approved, and connection to overhead lines was completed in April 2021.