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From: khai@amara.uunet (Sao Khai Mong)
Newsgroups: sci.electronics
Subject: Re: Free power from 'whispering wires' ??
Message-ID: 
Date: 7 Jul 88 06:59:29 GMT
References: <3170@tekgen.BV.TEK.COM>
Sender: khai@amara.UUCP
Organization: Applied Dynamics International, Inc.
Lines: 42
In-reply-to: steves@tekgen.BV.TEK.COM's message of 1 Jul 88 20:09:51 GMT


In article <3170@tekgen.BV.TEK.COM> steves@tekgen.BV.TEK.COM (Steve Shellans) writes:

>   If it's a DC transmission line, you would have to rotate the inductor
>   thru the field.  Couldn't this be accomplished by a motor that ran
>   off (some) of the power that you were extracting?  Of course, it
>   would have to be started by hand.

No, you can't from a DC line.  The juice you get out of the inductor
will be your mechanical energy input.  You are talking about
perpertual motion here.  Before you get to a DC xmission line, might
try your theory by using a permanent magnet first!

>     1. Are the transmission wires far enough apart that you could get the
>	magnetic field from one of them without being cancelled out by
>	the other(s)?  Alternatively, how could the device be shielded
>	so that it 'saw' only one wire?

You could use some iron or steel plates in some configuration, in
theory.

>
>     2. Does anyone know how to do the calculations to see how much power
>	you could get as a function of voltage and current thru the
>	transmission line, distance from the line(s), and size of the
>	inductor?

Very little energy can be obtained for practical purposes.  Cost/kw will
be enormous.  I have heard that you can light up flourescent lights
under HT AC wires, but they light up due to the electric field, not
the magnetic field.

>     4. What percentage of the high-voltage lines that one sees in the
>	countryside are AC and what percentage are DC?

Almost all are AC.  I think that there are probably fewer than ten
DC links in the US, and probably not more than twenty in the world.
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