Re: Lightning strikes monitor (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 2 Sep 2007 09:49:37 +0800
From: Peter Terren <pterren@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Lightning strikes monitor

I am involved peripherally in a building that may be subject to lightning 
strikes.  It is the Leaning Tower of Gingin in Western Australia and has had 
the foundations laid. It is at the Gravity Discovery Center where I have 4 
running displays (lifter, ferrofluid, maglev and can crusher).
http://www.gdc.asn.au/futureprojects.php

I had in mind that if the lighning rod at the top was copper for part of the 
segment, that a rogowski coil could nicely measure lighning strikes 
current/time profile if attached to a datalogging computer.  I already have 
experience with measuring 100kA discharges with my coinshrinker and lighning 
is in this ballpark.
http://tesladownunder.com/CanCrushing.htm#Measurement%20of%20high%20current%20pulses

The copper (or aluminium) rod needs to be done in construction (I am not 
going to climb up there afterwards).  Any comments?

Peter




>
> ---------- Forwarded message ----------
> Date: Fri, 31 Aug 2007 23:40:28 -0700
> From: Jim Mora <jmora@xxxxxxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: Lightning strikes Sears Tower (fwd)
>
> Hello List,
>
> I have often wondered: what sort of grounding systems are used for these
> bolts - particular Positive Lightning? Has anyone had experience with high
> rise grounding systems? It's hard to imagine all the computers running in
> Sear's Tower without a twitch after such events. The instantaneous 
> magnetic
> field must be enormous.
>
> Regards,
> Jim Mora
>