Cross-Skagerrak

Cross-Skagerrak is the name of an high-voltage direct current (HVDC) transmission facility between Tjele (Denmark) and Kristiansand (Norway). It is owned and operated by Statnett in Norway, and Energinet.dk in Denmark.

Technical features

The Cross-Skagerrak 1–3 scheme consists of a overhead line and a underwater cable. The towers were originally constructed for four poles, but were rebuilt for three conductors (three poles) when Skagerrak 3 was established. Near Aggesund HVDC Cross-Skagerrak crosses Aggesund strait overhead on towers with a span.

For such a long submarine cable, an AC transmission scheme would not be feasible since too much of the cable's capacity would be consumed by the capacitance of the cable itself.

Skagerrak 1 and 2

Cross-Skagerrak went in service in 1977 as a bipolar HVDC scheme. This facility was built with thyristor valves. When installed this underwater cable was the world's longest and deepest underwater HVDC power cable. The cable, manufactured by Alcatel, is laid in a maximum water depth of .

Both cables have a capacity of 250 MW at 250 kV.

Skagerrak 3

In 1993 the scheme was extended by HVDC...
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