On Mon, 28 Jul 2003, Stephen Cope wrote:
> By the way, search for "ethernet isolation" and you find some
> interesting products. There are transformers specifically to fix this
> sort of thing. Since lightning is DC a transformer will be unable to
> pass the voltage on. Am I right in this assumption?
NO!! Don't be deceived. As the current builds up in the primary coil a
voltage builds up in the secondary caused by the growing magnetic field.
When the current drops the magnetic field collapses causing a reverse
voltage in the secondary. A car ignition coil work this way. The points
open, the current stops, the magnetic field collapses and ~10,000v produced
in the secondary. With AC the voltage/current is always changing.
Now with a lightning strike ...
Phil.
--
Philip Charles; 39a Paterson Street, Abbotsford, Dunedin, New Zealand
+64 3 488 2818 Fax +64 3 488 2875 Mobile 025 267 9420
philipc@copyleft.co.nz - preferred. philipc@debian.org
I sell GNU/Linux & GNU/Hurd CDs. See http://www.copyleft.co.nz
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