[TCML] Pig SISG: Destroying the Indestructible
FIFTYGUY at aol.com
FIFTYGUY at aol.com
Tue Apr 1 14:19:16 MST 2008
In a message dated 4/1/08 7:14:46 A.M. Eastern Standard Time,
teslamark at sbcglobal.net writes:
>Based on your data/observations I have the following theory as to the
Your theory sounds good to me. But I think any story that starts with
"Step 1: Secondary streamer hits electronics on the primary side" is gonna have
an unhappy ending!
>This explains how (1) SISG circuit could be destroyed. Not sure how this
>leads to all circuits on one board being knocked out unless the initial
>strike took out all (4) TVS on the board associated with the (4) SISG
The other 3 SISG circuits on the blasted board are just fine.
>Recently, I was surprised to see much discussion on TCML about a strike rail
>not being necessary or even a hindrance. I did not post on that subject,
>but I think you have demonstrated the importance of having a strike rail to
>prevent damage to the primary circuit.
A strike rail wouldn't have done much good - I'm getting a lot of
strikes that curve *under* the primary to hit components. I put steel sheets along
the sides of the area under the primary, and this has worked quite well. If I
was doing a more permanent setup, I'd use aluminum-foil coated plastic
sheets, with slots to reduce any "circulating current". The steel pieces aren't
getting warm, so there can't be too much power lost through them anyhow.
FWIW, the SISG-pig coil seems to tolerate primary strikes just fine. The
arc will trigger a breakover from the primary turn it strikes to the inner
turns, and the triggered arc is of course quite loud and bright! This of
course causes the coil to stumble a little, until it "gets back in the game" with
a steady rhythm.
I'd really like to know what happened when the strikes that curled under
the primary managed to blow up my rectifier legs. But since I prevented
that, and substituted bar rectifiers for the blown legs, the bridge has been fine.
Center for the Advanced Study of Ballistic Improbabilities
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