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Current profile of subsea export cables

Sig
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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    well, draw it as an L-C-L pi network, and you will see how in can be used to step the voltages up and currents down, or vice versa.


    In a much smaller scale the inductive ballast and its PF compensation cap of the old school florry tube did a similar double act to convert the voltage needed by the tube, say 100V 400mA for a 40W tube, to 230V  at a correspondingly lower current (though never as good as the  180ma or so one would like to see if the choke was lossless)


    Radio people talk about impedance matching and draw smith charts, and power people talk about reactive kVA or kVAr , but it is the same effect.

    L match - like in the florry. ,     image 2 of these back to back, sharing the cable capacitance.


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    well, draw it as an L-C-L pi network, and you will see how in can be used to step the voltages up and currents down, or vice versa.


    In a much smaller scale the inductive ballast and its PF compensation cap of the old school florry tube did a similar double act to convert the voltage needed by the tube, say 100V 400mA for a 40W tube, to 230V  at a correspondingly lower current (though never as good as the  180ma or so one would like to see if the choke was lossless)


    Radio people talk about impedance matching and draw smith charts, and power people talk about reactive kVA or kVAr , but it is the same effect.

    L match - like in the florry. ,     image 2 of these back to back, sharing the cable capacitance.


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