Date: Sun, 30 Nov 2014 21:42:09 +0800 From: Erich Dollansky <erichsfreebsdlist@alogt.com> To: Darren Pilgrim <list_freebsd@bluerosetech.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: OT: UPS for FreeBSD Message-ID: <20141130214209.78a99653@X220.alogt.com> In-Reply-To: <547A24F7.6070100@bluerosetech.com> References: <CAHieY7QGp2ELF-R91eu=vSrPsimVmVNJQ4kfucQ56PR7EEZmig@mail.gmail.com> <m57qdq$did$1@ger.gmane.org> <54777AB1.9010800@bluerosetech.com> <m581p1$65m$1@ger.gmane.org> <54779629.302@bluerosetech.com> <alpine.BSF.2.11.1411271433320.60866@wonkity.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com> <CABhTyc9m7fOoeV170dj=foAhmyYWphzc8KD8wBacu5gNRPhT%2BQ@mail.gmail.com> <54791d3a.w/pI0kak03d%2B3nKC%perryh@pluto.rain.com> <CAHu1Y71vVbdx6Yd1VbE7kb_8k9O5UG93RXEaORPU0tULCpMsCQ@mail.gmail.com> <547937AB.1030706@radel.com> <20141129121211.014cb856@X220.alogt.com> <547A24F7.6070100@bluerosetech.com>
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Hi, On Sat, 29 Nov 2014 11:56:39 -0800 Darren Pilgrim <list_freebsd@bluerosetech.com> wrote: > On 11/28/2014 8:12 PM, Erich Dollansky wrote: > > Real high voltage transmission > > lines using DC make sense. > > Someone already tried that. It doesn't work. The conductors have to > be impractically large to get a useful amount of current, and the > distance loss is so high you can't build even a metro grid with it, > let alone a regional grid or the long-distance transmission systems > we use now. it does not work? http://en.wikipedia.org/wiki/High-voltage_direct_current It is a pretty common thing meanwhile. It is used only inside the networks and consumers never get a direct contact to the DC part of it. Erich
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