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Neptune's Technology
The Neptune Regional Transmission System is built using proven,
state-of-the-art, solid-state, High Voltage Direct Current (HVDC) undersea transmission technology.
It is constructed in an environmentally sound manner, avoiding major fishery and other
environmentally sensitive locations. The Neptune RTS sub-sea cable eliminates the need for new
transmission line corridors through urban and suburban neighborhoods and rural areas. Neither the
cable nor the converter stations generate air emissions and thus contribute to current efforts to
provide environmentally friendly electricity resources on Long Island.
Prysmian manufactured and installed the 65 miles-long submarine cable link, capable of
transmitting continuously 660 Megawatt and not less than 750 MW peak by means of a high-voltage
direct-current (HVDC) system operated at 500 kV (enough to supply electricity to 600,000 homes).
The link had to be installed in 2 campaigns using in one case a laying barge and in the other case
the cable ship Giulio Verne due to different environmental conditions on the two coasts.
As part of the project, Prysmian installed 14 miles of High Voltage
direct-current (HVDC) underground cable system in Long Island to connect the submarine link with
the nearest terminal stations and the extruded submarine and land medium voltage cables for the
return current of the whole system.
The Submarine transmission line consists of a bundle of three cables - a 500 kV HVDC cable,
a fiber optic cable and a medium voltage metallic return cable. They are installed in bundle
configuration, fastened together with ropes and straps applied before approaching the laying
sheave.
The project includes also a 0.5 miles-long 230kV alternate current (XLPE)
cable system at the Sayreville converter station and a 2 miles-long 345 kV AC (XLPE) cable system
to link the Duffy Avenue converter station to the Long Island Power Authority (LIPA) Newbridge Road
interconnection installations, to gain access to the power produced in Pennsylvania, New Jersey e
Maryland, thus increasing the potentially available electrical power in the New York area.
Both the submarine and the land cables of the HVDC system were manufactured by Prysmian at
its premises based in Arco Felice, near Naples in Italy, whereas the two AC cables were produced in
the plants of Gron (France) and Delft (The Netherlands). |
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