Nexans HV Submarine Power Link

Date
09/01/2010

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Submarine cables

Nexans, the worldwide leader in the cable industry, offers an extensive range of cables and cabling systems compromising low and medium voltage cables, high and extra-high voltage cables up to 400kV. The company is a global player in the infrastructure, industry, building and Local Area Network markets. Nexans addresses a series of market segments: from energy, transport and telecom networks to shipbuilding, oil and gas, nuclear power, automotives, electronics, aeronautics, material handling and automation.

Nexans has now been awarded a € 64million turnkey contract by Greece's PPC (Public Power Corporation) - the country's largest electrical power utility - to design, manufacture and install the new high-voltage alternating current power link between Evia and the region of Attika on the mainland. The project will facilitate the development of wind power projects totaling around 400MW on Evia, the second largest of the Greek islands, by enabling the power they produce to be exported directly into PPC's national power transmission grid. The 150kV link will interconnect the Nea Makri substation on the coast of Attika with the Polypotamos substation on Evia. Nexans will manufacture, supply and install three sub-sea cable circuits that will take a 21km route across the Gulf of Evia in waters reaching a maximum depth of 85 metres. Nexans is also supplying the underground power cables (27km) to provide the land connections at each end of the submarine cables together with associated accessories such as transition joints and outdoor terminations. "The Nea Makri- Polypotamos contract further reinforces Nexans' position as a trusted partner for utility customers in the construction of the high-voltage sub-sea interconnection projects that are vital to the continued penetration of wind power as part of the global energy mix", says Yvon Raak, Nexans Senior Corporate Executive Vice President. "The key factors in winning this contract were our wealth of experience in many similar projects, combined with our capability to provide a complete in-house service from design and manufacture of the sub-sea and underground cables to installation and commissioning."

The 150 kV submarine cables will be manufactured in Nexans' specialized submarine cable facility in Halden, Norway. They will feature XLPE insulation and comprise three power cores with a copper cross-section of 630mm2. Three cable circuits will be installed across the Gulf of Evia to provide two circuits in normal use with one spare to ensure continuity of operation. Each circuit will have a nominal capacity of 200MVA. Installation is planned to be carried out by Nexans' own cable ship, the C/S Nexans Skagerrak. The cables will be buried approximately 1 metre below the seabed. The project is scheduled for completion within 36 months.

The 150kV underground cables will be a single core design for installation in three circuits, each circuit comprising three individual cables, over a 2.75km route on the Attika side and a 330 metre route on the Evia side. They will be manufactured by Nexans in France. www.nexans.com

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