Cross-Skagerrak

The HVDC Cross - Skagerrak is a high-voltage direct current transmission line ( HVDC) between Denmark and Norway. She went into operation in 1977 and runs between the converter station in Tjele in Denmark ( 56 ° 28 ' 42.6 "N, 9 ° 33' 58.7 " O56.4784972222229.5663 ) and the Norwegian converter station in Kristiansand (58 ° 15 ' 36, 1 "N, 7 ° 53 ' 55" O58.2600138888897.8986111111111 ). Cross - Skagerrak part of the transmission system operators Energinet.dk (Denmark) and Statnett (Norway).

Since this line has a long Seekabelabschnitt by the Skagerrak, no transmission of three-phase alternating current could be realized due to the high reactive power demand of the submarine cable. In addition, the power grids continental Denmark (part of UCPTE ) and Norway are operated asynchronously, so that a direct coupling of the two systems is not possible for this reason.

The HVDC Cross - Skagerrak is one of the first HVDC transmission systems that uses thyristors. In its original configuration, it was a bipolar HVDC line with an operating voltage of ± 250 kV and a transmission capacity of 1000 MW.

In 1993 the plant by a monopolar HVDC transmission system, the Cross - Skagerrak 3 has been expanded. This has a voltage of 350 kV with respect to ground, and a transmission capacity of 500 MW. As part of this expansion, the two existing poles were converted to monopolar HVDC systems, the parallel run with opposite polarity to the conti- Skan 3.

The line length of the HVDC Cross - Skagerrak is 250 km, of which 100 km on overhead line sections in Denmark and Norway and 130 kilometers on the submarine cable. The submarine cable of cross- Skagerrak, which partly runs up to 500 meters in water depths, has long been the longest submarine cable in the world.

The transmission line of the HVDC Cross - Skagerrak has some special features: it has since enlargement in 1993 as a three-phase line three conductors and is in Denmark on poles that are designed to accommodate four conductor cables in two planes laid.

Aggersund overhead line crossing

Near the village Aggersund the HVDC Cross - Skagerrak crosses the homonymous strait on 70 meter high masts with a span length of 470 meters (57 ° 0 ' 7.3 "N, 9 ° 17' 58.2 " O57.0020333333339.2994972222222 ).

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