DC-GFP/2 protection [RE-wrenches]

[Soluciones Energeticas]

Why not try the old knife switches with calibrated aluminum or wire as the fuse, or put 
several in a row to keep the skips down.



> Agreeing with Nick, my collection of lightning damage also seems to indicate
> induction pick-up in buried cables, is most often associated with a damaging
> strike, and often the system is not properly grounded, through some surely
> are well grounded. Usually an AC or DC branch to an out-building, or between
> power system and any other distant source/load is judged the inlet point.
> 
> The owners often suggest turning off their breakers in electrical storms. Of
> course that opens a far too small gap to assure anything, but may help a
> little in the lower voltage range spikes. What was once done effectively for
> industrial equipment, ham-shack antennas,  etc. is flip a DPDT knife switch
> that takes the antenna or buried conductor OFF the equipment and then
> connects it directly to ground instead. An extension of this that works in
> the simplest owner participating systems has been to manually disconnect
> known lightning source wires by using a high current plug and socket, so the
> plug and cable can be tossed about 2 feet away from the socket and can even
> be plugged into a grounded socket. THAT stops the problem, if someone is
> home and makes the change at the appropriate times. But it also shuts down
> some functions of the system for the duration of the storm. So: if we could
> just automate that. Conventional lightning protection schemes so far (MOV,
> oxide granules etc ) add a ground path containing some voltage drop,but do
> not remove the vulnerable connections.
> Steve Willey       steve at backwoodssolar.com
> Backwoods Solar Electric Systems
> ----- Original Message -----
> From: "Nick Houser" <offgrid at prcn.org>
> To: <RE-wrenches at topica.com>
> Sent: Saturday, August 24, 2002 1:07 PM
> Subject: DC-GFP/2 protection [RE-wrenches]
> 
> 
> > Todd and Rob, et all-----------This is such a critical issue--is there any
> > way we can determine the bottom line and lay it to rest, or is it going to
> > be just another unanswerable grounding conundrum? Most of the electronics
> > damage around here (vicious lightning territory) seems to involve
> induction
> > in buried conductors.
> 
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