At 22:41 7/22/2001 -0400, you wrote:
>Hi Ford,
>
> > Is it possible that the three lines were temporarily DC biased by the
> > lightning? How do you explain the > 1 second to discharge the lines?
>
>A large part of the problem is because once an arc is started, a
>very much lower voltage sustains the arc. Sometimes a breaker
>actually has to open and reset to stop the system from arcing.
>
>It's the same problem we have with power relays, and why antenna
>relays need to be overkill and not have materials that ionize or
>carbon track easily in the arc path.
>73, Tom W8JI
>W8JI@contesting.com
Hi,
This is exactly right Tom. We use contactors and relays here for the DC
rectifier
systems,and they have blowout coils or magnets to extinguish the arc. In
some of the
arc discharge systems you have to reduce the voltage to almost zero and
sometimes
even reverse (in cases of capacitor action above the zero point) before the arc
will extinguish.
This is a great group reflectees and glad to be subscribed. Keep up the great
discussions.
73 Phil
-----------------------------------------------
Philip Florig e-mail:pflorig@ieee.org
PO Box 44 (or):W9IXX@arrl.net
Worth, IL. 60482 amateur radio:W9IXX
USA also:J3X-T30,31,32,33P
team member:AH1A-J3A
-----------------------------------------------
Metro DX Club club call:W9TY
Oak Forest, IL. qsl via W9IXX
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