Re: getting high voltage from the high voltage lines? (fwd)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

I think that really high power transmitters do actually get supplied at
primary or distribution voltages (i.e. 14 kV+), but there's still a
transformer between utility and load.  I'll check with the Deep Space
Network guys at work.. they have multiple 400 kW transmitters, etc..  The
losses in 480V switchgear and wiring would be fairly high..

Mining operations do a lot at 2400V, from what I understand.  Again, these
are multi MVA kinds of operations.  BIG Electric furnaces (like those used
for melting steel) probably also work at distribution voltages.

Finally, Bill Wysock (who's on the list on occasion) looked into building a
"really big coil" run off primary voltages somewhere near the CA/NV border,
as I recall...



> Date: Wed, 18 Sep 2002 22:40:17 -0400
> From: dhmccauley-at-spacecatlighting-dot-com
> Subject: Re: getting high voltage from the high voltage lines?
>
>
> Not to mention the liability.  Plus, even commercially, there really isn't
a
> need for direct high voltage lines.   Even the highest voltage power
> supplies (such as those used in giant lasers, linear accelerations, very
> large radar systems, etc....) derive their power from 3-phase low voltage
> transformers such a 440 or 480VAC.  Sure the kVA ratings might be up even
in
> the 1000's, but its still low voltage.
>
> Dan