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The Swepol Link HVDC Connection Sweden / Poland

The Swepol Link HVDC Connection Sweden / Poland

Submarine Cable Link The SwePol Link HVDC Connection /

Sweden

Poland

Cable data Project content

Voltage 450 kV DC HVDC cable and accessories Power 600 MW HVDC converter stations Length 250 km Cable system design Conductor 2100 mm2 Cu Project management Insulation MIND Installation (on land and at sea) Weight 67 kg/m Customer SwePol Link Year 2000 The record from 1994, for the Production longest HVDC cable with the highest The complete SwePol Link Cable was capacity, was equalled in 2000 with manufactured in our the successful completion of the factory, which is specially designed to Swedish-Polish HVDC cater for the production of long, link between Sweden and Poland: powerful, high voltage cables. The cable was produced in 1. Stretching over 250 km, it is one of four continuous lengths of about the two longest submarine HVDC 60,000 metres and the entire cable cables ever laid. was completed in less than 15 2. At 600 MW, the cable is one of the months. most powerful HVDC cables in commercial operation. Cable Route 3. At 450 kV DC, this cable together with the cable between Sweden and The cable route begins at Stärnö , has the highest voltage Converter Station, with a rating of all existing submarine land section of 2,3 km. From there HVDC cables. the MIND cable and the two return cables run parallel across the bottom ABB was the turnkey contractor for of the to Poland. The route the project and was responsible for was chosen to minimise the impact supplying the cables as well as the on fishing areas and where a bottom converter stations at both ends. The suitable for burying the cable was wide range of know-how within the found. The land section of the cable ABB Group, proved to be vital for in Poland is about 13 km long and it the rapid and successful development sealed lead sheath with a PE jacket ends in the Slupsk Converter Station. and completion of the project. protects the insulation from moisture or water penetration. The mechanical Installation The Cable strength of the cable is provided by tape and two layers of steel-wire armour. The submarine cable laid across the The SwePol Link is a MIND cable: The steel wires are applied in opposite Baltic Sea has a length of 239 km and mass-impregnated, non-draining, directions to form a counter-helix, which weighs some 20,000 metric tons. paper-insulated HVDC cable. It has a eliminates any torsional stress. An outer Since no cable-laying ship currently in 2100 mm2 conductor serving of bitumen-bonded existence can cope with such a consisting of concentric layers of polypropylene yarn protects the cable weight, the cable had to be laid in keystone-shaped strands, optimising a from corrosion. four sections, joined by field splices. smooth surface with very compact All sections of the cable were loaded . MCRC System (Metallic Current directly on board the laying ship at Return Cables) our factory’s deep-sea port at A layer of semi-conducting carbon Karlskrona. For the landing of the The MCR cables consist of two standard paper on the surface of the conductor cable in Poland, the very sensitive XLPE insulated 20 kV cables which eliminates any possible unevenness, shore environment consisting of high together gives a sufficient conductor which would otherwise increase the sand , was passed by means of for the return current. The two MCR field-strength locally. The paper 500 metres directional drilling under cables together with the single HVDC insulation is 20 mm thick and consists the sand dunes and out in the sea in cable gives a completely closed HVDC of over 250 thin layers of sulphate order not to disturb the natural dunes. cable system. The design and the cellulose paper, which is first vacuum- installation of the cable have throughout dried and then impregnated with a Commissioning the project been guided by environmental high-viscosity insulating oil. concerns. As the design includes MCR The SwePol HVDC Cable System Outside the paper insulation is a cables, all possible risks of corrosion or was taken over by the customer April conductive layer of carbon and chlorite have been avoided. 19, 2000, launching a new era of metallized paper. A hermetically power transmission and power exchange in .

BU Cables Telephone Telefax E-mail ABB Power Technologies AB +46 455 556 00 +46 455 556 55 sehvc@se..com www.abb.com/cables

SEHVC M-039E

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