Kontek
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The Kontek (the name comes from "continent" and the name of the Danish power supply firm "Elkraft", which operates the power grid on the Danish islands Lolland, Falster and Sealand and has the abbreviation "ek") is, a 170 kilometer long, monopolar 400kV DC-cable for the interconnection of the German power grid with the electricity grid of the Danish island Sealand. Remarkable at Kontek is that, in contrast to similar plants, as the Baltic-Cable and the Konti-Skan also all land sections of the line on Falster, Sealand and Germany with a total length of 119 are implemented as underground cable. This unusual measure, which did not raise the price of the construction of the line connection of the Kontek insignificantly, does not have technical reasons, but was rather done in order to complete the line in time, because getting permissions for building overhead can take much time nowadays. The cable of the Kontek begins in the static inverter plant Bentwisch, lain south of the community. It runs together with the cable to the cathode, which is implemented as copper ring, on a length of 13 kilometers over country, in the Baltic Sea, to Markgrafenheide at the Baltic Sea. There the 43 kilometers long submarine cable section begins to the island Falster. Shortly behind the coastal line the cable to the cathode electrode of the Kontek runs in eastern direction leading to the cathode. In the Baltic Sea between Germany and Falster the high-voltage cable of the Kontek crosses also the cable of the HVDC Baltic-Cable. For the realization of this crossing one approximately 50 centimeters high ramp over the "Baltic Cable" in the Baltic Sea was erected, on which the cable of the Kontek lies. Near Gedser the submarine cable of the Kontek reaches the island Falster, which it crosses on a length of 50 kilometers as underground cable. Subsequently, again a 7 kilometer long submarine cable section follows for the crossing of the sea between Falster and Sealand. After this section a 53 kilometer long land cable on Sealand follows, which ends in the static inverter station Bjaeverskov. In contrast to the cable section near Rostock the electrode cable does not run parallel here. This runs from Bjaeverskov in southeastern direction to the anode lain before the southeastern-most end of Sealand, which is implemented as a titanium net lain before the coast of sea-country.
The Kontek can transfer maximally 600 megawatts and has been in service since 1996.
The high-voltage cable of the Kontek is implemented as paper-isolated oil-filled cable with two copper conductors of 800 qmm cross section permanently joined in parallel. It is on the land sections of the Kontek for better monitoring of the oil in the cable divided in approx.. 8 kilometers long sections, which are separated by oil-impermeable check sleeves from each other. In the proximity of these check sleeves - a bit away from the cable route - there are automatic stations for the monitoring of the oil pressure, the oil temperature and other operating parameters of the cable. In contrast to the land sections of the Kontek, the 45 kilometers long submarine cable section through the Baltic Sea between Germany and Denmark was implemented for practical reasons as a single oil-filled section without check sleeves. As electrode cables of the Kontek, as well as on the German as on the Danish side, commercial, plastic-isolated 17kV-cables are used.
The static inverter station in Bjaeverskov was attached to an existing substation for 380kV/110kV. In opposite for the construction of the static inverter plant in Bentwisch a new construction site was chosen, although only one kilometers northly there is still the 220kV/110lV-substation Bentwisch, built to a time when the GDR existed. In 2002 the static inverter plant Bentwisch was extended to a 380kV/110kV-substation and connected by a 110kV-line with the old 220kV/110kV-substation.