On Sun, 29 Jul 2018 20:12:52 +0200
"R.Wieser"  wrote:

> Steve,
>
> >> > Now the 132KV lines make sense...
> >>
> >> If it would be DC, not really. :-)
> >
> > Very high power under water links are often DC viz:
>
> Yep.  Not because of it being a generic usable method, but because the
> need for DC - not influencing magnetic compasses - overruled the cost for
> it.

 Erm no that's not the reason for HVDC. For long distance cable runs
under water the main reason is lower losses to cable capacitance (about
30% lower losses), another use is connecting grids without needing to
synchronise them.

> But I must say I'm rather surprised to see that new ones are being laid
> even now, in 2018 ...   I though that magnetic compasses where all but
> obsoleted, especially in this day-and-age where even a $30 phone has a
> GPS reciever.

 It was never to do with magnetic compasses, they work just fine
with overhead AC cabling why would running the cable under water make a
difference ?

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Steve O'Hara-Smith                          |   Directable Mirror Arrays
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