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The Baltic Cable is a HVDC power line running beneath the Baltic Sea that interconnects the electric power grids of Germany and Sweden. The Baltic Cable uses a transmission voltage of 450 kV – the highest operating voltage for energy transmission in Germany. The total project cost was 2 billion SEK (US$280 million), and the link was put into operation in December 1994. With length of , it was the second longest high voltage cable on earth, until Basslink came into service in 2006. It is a monopolar HVDC system with a maximum transmission power of 600 megawatts (MW). == Route == The course of the Baltic Cable starts in Germany at the converter station at Lübeck-Herrenwyk, which is on the site of a former coal-fired power station at . It crosses the river Trave in a channel below the bottom of the river and then follows its course as sea cable laid at the Eastern side of this river. After crossing the peninsula at Priwall the cable runs at first parallel to the coast of Mecklenburg-Vorpommern, in order to turn behind Rostock north-easterly toward Sweden. Approximately at , it crosses the submarine cable of HVDC Kontek. This is the only crossing of two submarine HVDC cables in the Baltic Sea and one of the only few worldwide. From the landing point at the southern coast of Sweden at , the Baltic-Cable runs a further as an underground cable until a point east of the road E6 at , where inside a fenced area the transition from underground cable to overhead powerline takes place. From there the powerline runs as overhead line over two suspension pylons in north-northwesterly direction until the first strainer at . There the line turns into north-northeasterly direction and runs over seven suspension pylons past Södra Häslov to the next strainer at . Its track goes now further on 8 suspension pylons in northeasterly direction to the third strainer at . The next section consists of 15 suspension pylons from which the third tower situated at , the ninth tower situated at and the 12th tower situated at are angle suspension pylons. It ends at a strainer east of Västra Ingelstad at . From this strainer the line runs on one suspension pylons, one angle suspension pylon situated at and the termination tower in northeasterly direction to Kruseberg converter station at . This facility, which is also known as Arrie converter station, is attached to a 400 kV/130 kV substation of the Swedish power grid. The total count of pylons of the long overhead line is 40. All these pylons have a single crossbar, on which two conductors are mounted on long insulators. Each conductor is a bundle of two ropes with 910 mm2 cross section. Both conductors are connected with each other at the ends of the overhead line, so this line is unipolar, although it looks bipolar. The anode, which is situated in the Baltic Sea at consists of 40 titanium nets each with a surface of 20 m2, which are laid on the sea bottom under plastic tubes and stones. It is connected to Kruseberg converter station with a 23-kilometre-long underground and submarine power line, which consists of two parallel-connected XLPE-insulated cables with 630 mm2 cross section, entering the Baltic Sea at and at . The cathode is situated in the Baltic Sea north of Elmenhorst at . It consists of a bare copper ring with a 2-kilometre diameter. It is connected to the static inverter plant in Lübeck-Herrenwyk with a 32-kilometre-long XLPE-insulated cable. The first 20 kilometres of this cable have a cross section of 1400 mm2 and the last of 800 mm2. This cable is laid in the tunnel under Trave River close to the high voltage cable and from then until a point situated at in a distance of 2.5 metres to the high voltage cable. By this the magnetic field, which may affect compasses of vessels in this highly frequented area is reduced. The remaining way to the cathode it runs on a separate way. As Baltic-Cable is a monopolar line it produces much higher magnetic fields than bipolar cables with the same ratings. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Baltic Cable」の詳細全文を読む スポンサード リンク
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