HVDC Cross-Skagerrak
Map with all coordinates:  
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Location of the two converter stations (red) of the HVDC Cross-Skagerrak, and the Aggersund overhead line crossing (blue) |
The HVDC Cross-Skagerrak is a high voltage direct current transmission line (HVDC) between Denmark and Norway . It went into operation in 1977 and runs between the converter station in Tjele in Denmark ( 56 ° 28 ′ 43 ″ N , 9 ° 33 ′ 59 ″ E ) and the Norwegian converter station in Kristiansand ( 58 ° 15 ′ 36 ″ N , 7 ° 53 ′ 55 " O ). Cross-Skagerrak is owned by the transmission system operators Energinet.dk (Denmark) and Statnett (Norway).
Since this line has a long submarine cable section through the Skagerrak , no three-phase alternating current could be transmitted due to the high reactive power requirement of the submarine cable . In addition, the power grids of 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 either.
The HVDC Cross-Skagerrak is one of the first HVDC systems to use 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 system was expanded to include a monopolar HVDC system, the Cross-Skagerrak 3. This has a voltage of 350 kV to earth and a transmission capacity of 500 MW. In the course of this expansion, the two existing poles were converted into monopolar HVDC systems, which are connected in parallel and operated with opposite polarity to the Cross-Skagerrak 3.
The line length of the HVDC Cross-Skagerrak is 250 kilometers, 100 kilometers of which is accounted for by overhead line sections in Denmark and Norway and 130 kilometers for the submarine cable. The submarine cable of the Cross-Skagerrak, which partly runs in water depths of up to 500 meters, was for a long time the longest submarine cable in the world.
The overhead line of the HVDC Cross-Skagerrak also has some special features: Since the extension in 1993, it has had three conductor cables like a three-phase current line and in Denmark is laid on masts designed to accommodate four conductor cables in two levels.
Aggersund overhead line crossing
Near the village of Aggersund, the HVDC Cross-Skagerrak crosses the strait of the same name on 70 meter high masts with a span length of 470 meters ( 57 ° 0 ′ 7 ″ N , 9 ° 17 ′ 58 ″ E ).
Web links
- Description on the ABB website ( Memento of June 28, 2009 in the Internet Archive )