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Nexans wins major contract for HVDC line in Brazil

EM NEWS BUREAU ,  Monday, June 27, 2011, 11:43 Hrs  [IST]

Untitled - 27.jpgNexans, a global leading expert in the cable industry, has been awarded a €20-million contract by the IE Madeira consortium to deliver overhead lines for the world's longest power transmission link, Brazil's Madeira River Power Interconnection.

This new HVDC (high voltage direct current) link, the first of two, will transmit 3,150 mw of power produced by the Rondônia hydroelectric plant in northwest Brazil to São Paulo, Brazil's main economic centre, over a distance of 2,375 km. The HVDC link will be between the new Rondônia hydroelectric plant and the city of São Paulo, across five Brazilian states and 86 towns and cities.

HVDC transmission at 600kV is being used to minimize transmission losses over the long distance and the link will eventually comprise two parallel overhead lines. Nexans has been selected to provide the conductors for the first circuit by IE Madeira, a consortium comprising the utilities Furnas, Chesf and CTEEP.

Advanced aluminium conductors: The Madeira River Power Interconnection is a bipole circuit, with each pole comprising four overhead conductors. Overall, Nexans is supplying some 6,700 km—equivalent to 21,120 tonnes—of its special all aluminium conductor (AAC) for the project. Each conductor features 91 bare wires, with a diameter of 44.4 mm.

AAC conductors are well established as part of the Nexans overhead line portfolio. However, a bespoke cross-section has been developed specifically for the Madeira River Interconnection project to provide the desired electrical and mechanical properties (breaking stress, elongation, linear thermal expansion coefficient for example) by taking into account the line's construction conditions, such as topography and climate. The typical span between the towers will be 500 metres.

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World's longest transmission links
The Madeira River Interconnection will set a new record as the world's longest power transmission link, with a route length of 2,375 km across five states, 86 towns and cities, in Brazil. The current record for an operational HVDC project is also in Brazilthe 900 km line from Itaipu Dam to Ibiuna in São Paulo State. The overall world record is for the 1,700 km AC line between Inga and Shaba in Zaire.
 
                 
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