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Re: Variac arcing = kickback? (fwd)
---------- Forwarded message ----------
Date: Thu, 15 Jan 1998 04:51:15 EST
From: Mark S Graalman <wb8jkr-at-juno-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: Variac arcing = kickback? (fwd)
Do you have a GOOD grounded line filter
in the AC line between the variac and the
transformers?
Mark Graalman
On Wed, 14 Jan 1998 20:01:09 -0700 (MST) Tesla List <tesla-at-pupman-dot-com>
writes:
>
>
>---------- Forwarded message ----------
>Date: Wed, 14 Jan 98 21:46:42 -0500
>From: Adam <absmith-at-tiac-dot-net>
>To: tesla list <tesla-at-pupman-dot-com>
>Subject: Variac arcing = kickback?
>
>
>I decided to see what would happen if I added more transformer power
>to
>my project, and I got disturbing arcing in the variac. The variac is
>an
>18 general radio 120V variac, which was feeding the two 9kV 60mA
>transformers on my project without incident. There is 8 feet of 14-3
>cable between the variac and the project, and the ground wire in this
>bundle is unused.
>
>When I added transformer number three and fired up the coil, I got
>power
>arcs between the variac's moving brush assembly and variac housing
>above
>it. The arc is jumping about 3/16" so I'm pretty sure it's not just
>the
>normal 140V there! What ever is sparking across this gap is followed
>by
>a power arc from the mains, which melted a bit from both parts of the
>variac. Somethings seems to be kicking back from the neons. This
>only
>seems to happen when there is a breakout from the toroid. I am
>naturally
>concerned for all appliances in the house, and I would like to correct
>
>this problem ASAP.
>
>What's going on here?
>
>-Adam
>
>