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ABB 20-035, Sitesing, Konti-Skan, Aalborg, Danmark
Customer Success Story


The first interconnection between Sweden and the western grid in Denmark was established in 1965 with the
250 MW 250 kV KontiSkan HVDC link across the Kattegatt, a narrow bay in southern Scandinavia, stretching from Gothenburg in Sweden to Aalborg in Denmark. The owners of the link are Energinet.dk and Svenska Kraftnät.

The converter stations were based on mercury-arc valve technology and situated in Stenkullen in Sweden, and Vester Hassing in Denmark. A second Konti-Skan cable rated 300 MW was added in 1988 from Lindome on the Swedish side to Vester Hassing. In 2006, the mercury-arc converters were replaced by thyristor converters.

Both poles of the KontiSkan HVDC project have been a testing ground for new Hitachi Energy HVDC developments:

Pole 1:

1973: Second generation thyristor test valve, 135 kV, 1,050 A (air cooled) in Vester Hassing.

1988: Light triggered thyristor (LTT) test valve, 135 kV, 1,050 A in Vester Hassing.

1992: The world's first air insulated outdoor thyristor valve, 135 kV, 1,050 A, in Stenkullen.

Pole 2:

1991: The world's first active DC filter in Lindome.

1993: The world's first electronically controlled AC filter, ConTune, in Lindome.

2019: Hitachi Energy once again returned to this link to perform an upgrade of the control and protection system for the KontiSkan high-voltage direct current (HVDC) transmission link with its latest Hitachi Energy Modular Advanced Control for HVDC (MACH) technology.

Illustrated overview for KontiSkan
Illustrated overview for KontiSkan
Main Data
Comissioning year: Upgrade: 2019
Pole 2: 1988
Pole 1: 1965
Configuration: Bipole
Power transmitted: Pole 2: 300MW
Pole 1: 250 MW
DC voltage: Pole 2: 300 kV 
Pole 1: 250 kV
Application: Interconnecting grids