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Home , NorNed, Norway

Submarine Cable Link The NorNed HVDC Connection, –

Cable data ABB project content

Voltage +450 kV DC HVDC cable and accessories for 420 km Power 700 MW HVDC converter stations Route length 580 km Insulation MI Conductor 270 km 2 x 790 mm2 Cu (flat cable) 2 x 150 km 700 mm2 Cu (single core cable) Weight 84 kg/m flat cable 37 kg/m single core cable Customer , Norway and TenneT, Netherlands Completion year 2008

The 580 kilometer-long NorNed link is continuous lengths of up to 154 km of the longest high-voltage single-core and 75 km of twin-core flat cable in the . This HVDC MIND cable which minimizes the need link is connecting the for jointing operations over long cable power grids of Norway and the interconnections. Netherlands and will enable power trading between the two countries as Cable Route well as increasing the reliability of The cable route begins with a electricity supply. The NorNed project section of 1.5 km from Eemshaven was undertaken by the two state-owned Converter Station in the Netherlands to power grid companies, Statnett in the shore. A twin-core cable runs for a Norway and TenneT in the distance of 270 km out from the Dutch Netherlands. coast and then split into conventional

single core cables from thereon. 1. Stretching over 580 km, it is the longest submarine HVDC cables ever Installation constructed. 2. At 700 MW, the cable is one of the The submarine cable, produced at ABB, most powerful HVDC cables in weighs some 35,000 metric tons. Since commercial operation. no cable-laying ship can cope with such 3. With 450 kV DC this cable, together a weight, the cable was laid in sections, with other HVDC cables such as the joined with five field splices. All Baltic Cable between and sections of the cable were loaded and the SwePol Cable directly on board the laying ship at our between Sweden and (both factory’s port at Karlskrona. To be able produced by ABB), have the highest to handle the twin-core cable, specially voltage rating of all existing submarine A layer of semi-conducting carbon paper designed handling equipment was HVDC cables. on the surface of the conductor eliminates utilized on the cable laying vessel. any possible unevenness, which would After laying the cable was trenched into ABB’s role in the project was to supply otherwise increase the field-strength locally. the sea-bed to bury it for protection. 420 km cables as well as the converter Outside the paper insulation is a conductive Close to the Dutch coast it was buried stations at both ends. The wide range of layer of carbon and metallized paper. A to a depth of 3 m, and then to 1 m know-how within the ABB Group, was hermetically sealed lead sheath with a PE along the rest of the route. In parts of vital for the rapid and successful jacket protects the insulation from moisture the route where the nature of the sea- development and completion of the or water penetration. The mechanical bed prevents trenching, it was protected project. strength of the cable is provided by steel by rock dumping. tape and two layers of steel-wire armour. The Cable The steel wires are applied in opposite Commissioning directions to form a counter-helix, which The NorNed cable is a MI cable: mass- The NorNed HVDC link will be ready eliminates any torsional stress. An outer impregnated, non-draining, paper- to begin operation in the end of 2007 serving of bitumen-bonded polypropylene insulated HVDC cable. Two different yarn protects the cable from corrosion. designs are used for the shallow part of the route: a twin-core cable and a Production single-core cable. Both cable types have copper conductor/conductors The NorNed cable was manufactured in consisting of concentric layers of our Karlskrona factory, which is specially keystone-shaped strands, optimizing a designed to cater for the production of smooth surface with very compact long, powerful, submarine high voltage construction. cables. The cable was produced in six

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