If I remember correctly, as you increase AC voltage past about 450Kv on long
haul lines
the power loss due to radiation  becomes greater than the loss due to
resistance on a similar
length DC line. The last I heard there were at least a couple of these DC
transmission lines
in the west as well.

Mike Jones

----- Original Message -----
From: "Thomas C. Sefranek" <tcs@CMCORP.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, April 26, 2003 11:30 AM
Subject: Re: [OT] Saftey issues: AC vs DC


> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tal
> > Sent: Saturday, April 26, 2003 1:50 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [OT] Saftey issues: AC vs DC
> >
> > AC allows you
> > to transfer the same amount of electrical power with less loses on the
> > wires(high voltage, low current).
>
> Tell me pray, what special properties of AC allow for this belief?
> Are you saying ohms law applies differently to AC as opposed to DC?
> Think about it, if I have the SAME voltage (high) and current why is there
> any difference?
>
> > There are special cases when high power DC system are used (e.g.
> > conventional submarines with huge banks of batteries and voltages in the
> > range of hundreds of volts) but I don't think any country uses DC for
> > power transmission.
>
> Better look again!  Here in the North East, we import DC from Canada,
> and convert it to AC locally.  I'm talking Multi-megawatts.
>
> > As for danger, I think that if you compare DC and AC of the same voltage
> > rating, AC is more dangerous because the actual momentary voltage can go
> > higher than the DC. This is because the AC voltage rating is typically
> > done by RMS which is kind of a average and is lower than the max peak
> > voltage.
>
> Again, another pseudo-science...
> The peak voltage is not the deciding issue.
> The physiological effects of AC vs DC ARE!
> Muscle contractions (Heart beats) are arrested with enough AC applied.
> DC of the SAME value heats the same, (Hurts more) but is not as likely to
> arrest the heart.
> >
> > Hope this helps,
> >
> > Tal
>
>
>   *
>   |  __O    Thomas C. Sefranek   WA1RHP@ARRL.NET
>   |_-\<,_   Amateur Radio Operator: WA1RHP
>   (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz
>
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