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Engineering360: "UK and Morocco to connect with world’s longest subsea cable"

12/27/2021 6:00 AM

Read Engineering360 article: UK and Morocco to connect with world’s longest subsea cable.

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Guru

Join Date: May 2008
Location: Aggieland, Texas
Posts: 666
Good Answers: 8
#1

Re: UK and Morocco to connect with world’s longest subsea cable

12/28/2021 5:21 AM

Wouldn't it be better to make the generators DC and convert to AC at the receiving station? Then, there would be only one conversion loss. Now, there's loses from AC to DC and then, DC to AC.

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Guru

Join Date: Jul 2006
Location: Eastern Kansas USA
Posts: 1441
Good Answers: 122
#2
In reply to #1

Re: UK and Morocco to connect with world’s longest subsea cable

12/29/2021 10:36 AM

The insulation requirements on the windings inside the generators would be impossible to achieve if their output was to be at the very high voltage used in the undersea transmission line. The undersea link is long enough that transmission of AC would result in extremely high losses due to capacitive coupling and probable RF (60 or 50Hz) radiation from the cables. Therefore you generate in AC, transform it to very high voltage, rectify it, transport it to the distant users, then invert it back to AC, etc. This approach has been used for decades already, and has efficiencies over 90% (if I remember correctly).

--JMM

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