Kontek

The high- voltage direct current (HVDC ) Kontek is a 400 kV -powered, 170 -kilometer-long, monopolar DC cable for connecting the German electricity network and the power network of the Danish island of Zealand. The name " Kontek " comes from " continent" and the name of the Danish energy company Elkraft (now Energinet.dk ), which operates the power grid on the Danish islands of Lolland, Falster and Zealand and the abbreviation " ek " had.

What is remarkable about the HVDC Kontek that, in contrast to similar systems, such as the HVDC Baltic Cable and the HVDC Kontiskan, all the 119 km long sections of land on Falster, Zealand and Germany not as an overhead line, but as underground cables have been run.

This unusual measure, which has not become more expensive to build the line connecting the Kontek immaterial, has no technical reasons, but rather was carried out in the interest of timely completion, since approval procedures for overhead lines can be very long nowadays.

The cable of the HVDC Kontek starts lying south of Bentwisch converter station (54 ° 6 ' 2 " N, 12 ° 12' 53 " O54.10055555555612.214722222222 ). It runs along with the cable to the present in the Baltic Sea cathode, which is designed as copper ring, over a length of 13 kilometers over land and reaches Markgrafenheide the Baltic Sea. There, the 43 km long Seekabelabschnitt begins to the island of Falster. Just beyond the shoreline branches leading to the cathode cable Kontek in an easterly direction from the cathode to the east of the Seekabeltrasse located.

In the Baltic Sea between Germany and Falster the high voltage cable to the HVDC Kontek also crosses the cable of the HVDC Baltic Cable. For the realization of this intersection, an approximately 50 centimeters high ramp above the "Baltic Cable" in the Baltic Sea was built on the lies of the cable HVDC Kontek. In Gedser the submarine cable of Kontek reached the island of Falster, which it crosses over a length of 50 kilometers underground cables.

Then follows again a 7 km long Seekabelabschnitt to cross the sea between Falster and Zealand. At this section is a 53-kilometer stretch of land cable section on Zealand joins, which ends in the converter station Bjaeverskov.

In contrast to the cable section at Rostock runs here not the electrode cable in parallel. This runs contrary of Bjaeverskov in a southeasterly direction to right outside the south-eastern end of Zealand anode, which is designed as a misplaced off the coast of Zealand titanium mesh.

The Kontek can transfer a maximum of 600 MW and is in operation since 1996.

The high voltage cable of Kontek is designed as a paper- insulated oil-filled cables with two permanently connected in parallel copper wires of 800 mm ² cross-section. It is divided on the land portions of the Kontek for better monitoring of the in cable oil is around 8 km long sections that are separated by oil-impermeable barrier sleeves. Near this barrier sleeves are located - something remote from the cable route - unoccupied automatic stations for monitoring the oil pressure, oil temperature and other operating parameters of the cable.

In Germany there are three such cables monitoring stations namely north of Bentwisch (54 ° 7 ' 47 " N, 12 ° 12 ' 6" O54.12972222222212.201666666667 ), south of Stuthof (54 ° 9 ' 41 " N, 12 ° 10' 26" O54.16138888888912.173888888889 ) and in Markgrafenheide at the end of Seekabelabschnitts (54 ° 12 ' 13 " N, 12 ° 9' 7" O54.20361111111112.151944444444 ). In contrast to the land portions of the Kontek of the 45 -kilometer Seekabelabschnitt has been executed by the Baltic Sea between Germany and Denmark, for practical reasons without blocking sockets. As the electrode cable Kontek commercially available, plastic-insulated 17 kV cables, both on the German as well as on the Danish side, used.

The converter station in Bjaeverskov (55 ° 26 ' 57 " N, 12 ° 0' 4" O55.44916666666712.001111111111 ) was attached to an existing substation for 380/110 kV. In contrast, the converter station is in Bentwisch a building on " greenfield ", although only one kilometer north of the still derived from GDR times 220/110-kV-Umspannwerk Bentwisch located. However, the installation of the HVDC " Kontek " was expanded in 2002 to a 380/110-kV-Umspannwerk and connected via a designed as a transmission line 110 kV line with this. A further expansion took place in 2010 for the supply of the offshore wind farm Baltic 1, which is carried out via a 150 kV three-phase power cable.