Current profile of subsea export cables

Sig over 4 years ago

From the offshore substation, why would the current profile slope down towards the middle of the export cable then rise again at it's terminal end (onshore substation)? Is it because at both ends of the export cable, there is effectively a 'source'? One would have expected the current from one end to the other to have a linear drop off (heat and other losses).Wondering if charging current has a play into this also.

See attached graph.

Thanks

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0 Michael Wrigley over 4 years ago

I don't think I've seen any mention of the voltage of this arrangement. The cable lengths are also very important. For a subsea cable compensation can only be applied at the ends which probably, depending on cable length, limits the voltage to a max of 220kV. What is the total power generated by the windfarm? It sounds like there are going to be some pretty hefty cables. Finding the appropriate ship to lay them may need some attention at an early stage.
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0 Michael Wrigley over 4 years ago

I don't think I've seen any mention of the voltage of this arrangement. The cable lengths are also very important. For a subsea cable compensation can only be applied at the ends which probably, depending on cable length, limits the voltage to a max of 220kV. What is the total power generated by the windfarm? It sounds like there are going to be some pretty hefty cables. Finding the appropriate ship to lay them may need some attention at an early stage.
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Current profile of subsea export cables

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