>> "I thought I²R heating was greater for DC. > NO, if the power factor is perfect, the losses due to current > squared times circuit resistance, are... the same for AC and DC,
I can see that my original statement was confusing. What I meant was that for the same conductor and same I^2R loss, DC can deliver nearly 40% more power because the DC line can operate at the PEAK voltage rating of the line, whereas the AC line only delivers that same current power at RMS voltage, not peak. 40% increase is worth doing for long point-to-point transmission (with no taps) > On Wed, Jun 25, 2014 at 3:11 PM, Robert Bruninga wrote: > > > > > > [the main] reason we have AC transmission > > > > is due the difficulties sending DC over long distances. > > > > > > But for very long distances, high voltage DC wins. At very long > > > distances AC is inefficient due to capacitance (and much > > > shorter when underground/underwater). AC also has additional > > Peak vs RMS IsquareR losses. > > > On Wed, Jun 25, 2014 at 12:02 PM, Robert Bruninga wrote: > > > > Somebody has to pay for road repairs. > > > > Pipelines are a different issue. > > > > > > Rather than spending $billons of dollars on a pipeline monument to the > > > past, it is better to make that same investment into electrical > > > transmission lines for now and the future instead. > > > > > > The only thing holding back a near infinite supply of FREE renewable > > > energy is the lack of the long haul transmission lines to get the solar > > > and wind energy from where it is abundant (the plains) to where it is > > > needed. Pipelines do the same thing for oil but are an ultimate > > dead-end. > > > > > > Anyone want to invest in finding a way to send copper conductors > through > > > old pipelines to convert obsolete pipelines to underground DC > > transmission > > > lines? > > > > > > Bob, Wb4aPR > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140625/bdd13d3f/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
