Konti-Skan
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Kontiskan (also Konti-Skan) is the name of two high-voltage direct-current transmission lines between Denmark and Sweden. The 1965-built Kontiskan 1 can transmit a up to 250 megawatts of power with an operating voltage of 250kV, the 1988-built Kontiskan 2 can transmit 300 megawatts with a voltage of 285kV. While Kontiskan 1 uses mercury vapor rectifiers in the static inverter plants, Kontiskan 2 uses thyristors.
On the Danish side the static inverter plants of Kontiskan 1 and 2 are close to Vester Hassing near Aalborg. From Vester Hassing a 34 kilometers long, two-pole overhead line with the high voltage poles of Konti-Skan 1 and Konti-Skan 2 to the cable beginning at the Danish coast near Staesnaes, while two 27 kilometers long underground cables transfer the current of the other poles of Konti-Skan 1 and 2 to the grounding electrode at Soera. The 23 kilometer long submarine cable to the Danish island of Laeso begins at Stensnaes. This cable consists of 3 parallel cables, each of two partial conductors with a copper cross section of 310 square millimeters. One of these cables is used by Kontiskan 1 and one by Kontiskan 2. Of the third set of cables, one conductor is used for Kontiskan 1 and the other for Kontiskan 2. Laeso island is crossed by the Konti-Skan on a 17 kilometers long two-pole overhead line. Between Laeso and Sweden a monopolar copper cable was laid for Kontiskan 1 and 2 with a cross section of 1200 square millimetres.
From the Swedish coast a 38 kilometre long overhead power line runs to the converter station of Konti-Skan 1 near Stenkullen. On the first 9 kilometres of this line the pylons also carry the high-voltage conductor of Kontiskan 2 and the conductor to the common grounding of Kontiskan 1 and 2 near Risų on the Baltic Sea. In opposite to Kontiskan 1 the static inverter station of Kontiskan 2 is situated South of Gothemborg in near Lindome, and the route of the Kontiskan 1 line. The last 30 kilometers of Konti-Skan 1 are installed on guyed aluminum framework pylons with an unusually low weight of only 800 kilograms.