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A submarine power cable is a transmission cable for carrying electric power below the surface of the water. [1] These are called "submarine" because they usually carry electric power beneath salt water (arms of the ocean , seas , straits , etc.) but it is also possible to use submarine power cables beneath fresh water (large lakes and rivers ).
The Cross-Sound Cable can transmit a maximum power of 330 MW at a voltage of +/- 150 kV DC. The maximum current for Cross-Sound Cable is 1175 amperes.The Cross-Sound Cable is not simply a pair of underwater HVDC cables; rather it is a bundle of cables that includes the HVDC transmission lines and fiber-optic cables for phone and Internet data transfer.
The submarine cable was laid in September 2006. [12] [13] [14] The Estlink cable was inaugurated on 4 December 2006 and it became fully operational on 5 January 2007. [15] [16] The Estlink 1 cable was operated by AS Nordic Energy Link company, founded by Baltic and Finnish power companies.
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The International Cable Protection Committee — at ISCPC.org, includes a register of submarine cables worldwide (though not always updated as often as one might hope) United Kingdom Cable Protection Committee — at UKCPC.org.uk; Kingfisher Information Service — at KISCA.org.uk, source of free maps of cable routes around the United Kingdom ...
Isle of Wight submarine cables (Langley, Hampshire – Cowes & East Wooton, Isle of Wight) 132 kV 50.80967°N 1.35447°W ; 50.711304°N 1.254048°W Kentish Flats offshore wind farm, Kent [31] 2005 33 kV 51°27′36″N 1°5′24″E ; 51.3548°N 1.08534°E Laleham, Surrey – Ealing – Willesden, West London [32] 275 kV
The first stage of this project went in service in the year 2000 with a bipolar voltage of 250 kilovolts (kV) and rated to carry 1400 megawatts (MW). A second-stage upgrade to 500kV has been planned from the outset and the HV cable, DC switchgear and DC reactor are already rated for the higher voltage, but as of 2012 the upgrade has not been put into effect.
The Celtic Interconnector is a 700 MW high-voltage direct current (HVDC) submarine power cable under construction between the southern coast of Ireland and the north-west coast of France. [1] It will be the first such interconnector between the two countries. Trial operation is planned to commence in 2026. [2]