![]() Additional 95 Mvar reactive power is delivered by a capacitor bank. The filters deliver a reactive power of 95 Mvar. The filters for the 11th and 13th harmonics are adjustable. ![]() Each filter consists of a coil and a capacitor switched in row. Unlike other monopolar HVDC schemes, Swepol uses a metallic return consisting of 2 cables with 630 square millimetres (0.98 sq in) sections for the submarine portion of the line, and a single cable with 1,100 square millimetres (1.7 sq in) sections for the land portions.īoth stations use air-core inductance smoothing rectifiers of 225 mH and a weight of 27.5 tonnes (61,000 lb), with filters for the 11th, 13th, 24th, and 36th harmonics. The 239.28 kilometres (148.68 mi) long submarine cable comes ashore in Poland near Ustka at 54☃4′25″N 16☄6′57″E / 54.57361°N 16.78250☎ / 54.57361 16.78250 ( SwePol enters Poland) and runs underground for the remaining 12.55 kilometres (7.80 mi) to Bruskowo Wielkie HVDC Static Inverter Plant. It runs for 2.22 kilometres (1.38 mi) as an underground cable from the Stärno HVDC Station to the shore of the Baltic Sea. The cable has a cross section of 2,100 square millimetres (3.3 sq in). The link was inaugurated in 2000 and can transmit up to 600 MW power at a voltage of 450 kV. SwePol is a 254.05-kilometre (157.86 mi)-long monopolar high-voltage direct current (HVDC) submarine cable between the Stärnö peninsula near Karlshamn, Sweden, and Bruskowo Wielkie, near Słupsk, Poland. Click on one of the cables to learn more about its type, length, capacity, when it was installed and who maintains it. The map of the week features a schematic representation of the submarine communication cables that cross European waters. Submarine telecommunication cable networks cost billions to install 1 and need constant monitoring and repair, as they may be broken or damaged by trawl fishing, anchors, earthquakes, submarine landslides and even shark bites 2. ![]() However, this capacity comes at a significant price. ![]() These fibre-optic cables have the capacity to transmit data at a staggering 200 terabits per second 1, which vastly outpaces today’s satellite radio transmission (around 1 gigabits per second), making them the preferred means of communication. While these early cables consisted of insulated copper wires, which were simply dropped on the seabed, current generation submarine cables consist of optical fibres covered by many protective layers buried in the seafloor 2. Submarine cables have a long history starting with the first commercial submarine telegraph cable in the English Channel in 1850, closely followed by the first transatlantic cable in 1866 1. With over 99% of international internet and telephone traffic passing through submarine telecommunication cables 1, they are a vital though often forgotten part of today’s digital society. Whenever you access a website hosted on a foreign server, chances are high that the information you are receiving travelled through the depths of the ocean.
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