No, the current does not follow "the shortest path". Yes, my mother always said
that but Ohms' law predict more accurately how the current divide. More current
will go through a lower resistant/ high conductive path but there will be
current going through any conductive path, high or low.
Keep in mind that due to ionization conductivity can change during a lightning
event. The current will even follow paths generated directly through air. I
guess you might also experience where grounding rods get insulated from ground
due to the glazing effect due to the very high current density and following
high temperature. I don't know if this ever happens but like to hear if anybody
knows.
All the above events will lead to the unpredictable path of lightning damages.
An other phenomena you might encounter is, if you are present at the lightning
event, that the lightning flashes seen, do not necessary occur at that point
the observer claim they saw them. This is something I experienced my self.
Best 73 de,
Hans - N2JFS
-----Original Message-----
From: Kelly Taylor <ve4xt@mymts.net>
To: Edward McCann <edwmccann@yahoo.com>
Cc: Bryan Swadener via TowerTalk <towertalk@contesting.com>; Hans Hammarquist
<hanslg@aol.com>
Sent: Thu, Jan 14, 2016 12:24 pm
Subject: Re: [TowerTalk] Fwd: The Need for Grounding
The important thing to remember is electricity doesn’t follow the shortest path
somewhere, it follows the path of least resistance. And it’s important to point
out that during a lightning event, that path is going to change, as the
lightning charge will easily overload a single rod, driving that rod’s
resistance sky high. Since the event is not yet over, the remaining charge will
follow the next-best path, which could be through your radio. Better it be
through the other rods in your network, no?Is it useful to envision ground rods
as resistors, and a chain of ground rods as resistors in parallel?Since we all
know parallel resistors divide current among them, and as a group present a
resistance that is some fraction of their individual values, is it a good meme
to remind us of the importance of multiple rods?73, kellyve4xt> On Jan 14,
2016, at 10:35 AM, Edward McCann via TowerTalk <towertalk@contesting.com>
wrote:> > On point.> It is unlikely Ohm's Law will ever be repealed,> by the
current crew in the beltway or that if the pretenders to the throne.> AG6CX> >
Sent from my iPhone> >> On Jan 14, 2016, at 8:22 AM, Hans Hammarquist via
TowerTalk <towertalk@contesting.com> wrote:>> >> It's simply Ohm's law that
still is valid. Yes, voltage across all the inductance adds in too.>> >> >> In
my case, my tower is grounded with a resistance to ground of about 3 ohms (when
it was tested some time ago). If the tower is hit, (I guess) the current is
about 3 kA with a resulting 9 kV between the tower and ground.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|