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Re: Variac arcing = kickback? (fwd)
---------- Forwarded message ----------
Date: Thu, 15 Jan 1998 16:17:18 EST
From: Mark S Graalman <wb8jkr-at-juno-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: Variac arcing = kickback? (fwd)
I use a line filter between the transformer and
control unit and another between the control unit and
wall plug, the filters are tied to the RF ground.
I'm not sure if I understand your "second" safety
gap, there is no need for a safety gap on the primary
side of the transformers.
Mark Graalman
On Thu, 15 Jan 1998 12:31:42 -0700 (MST) Tesla List <tesla-at-pupman-dot-com>
writes:
>
>
>---------- Forwarded message ----------
>Date: Thu, 15 Jan 98 11:44:02 -0500
>From: Adam <absmith-at-tiac-dot-net>
>To: Tesla List <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?
>
>Nope. I have a 20A corcom filter between the wall socket and the
>variac,
>but nothing between the variac and the neons.
>
>Right now, I am designing a primary-side protection circuit to go
>between
>the neons and the variac. I am using the same schematic as the corcom
>
>filters, but with more robust components and a much lower cutoff freq.
> I
>am also putting a second safety gap and the few suitably rated oil
>caps I
>have (mostly from microwaves) across the primary of the neons to help
>absorb the impact before it hits the line filters. Then finally, a
>MOV
>across the mains input to the whole setup.
>
>Another question: Should the line filter's ground go to the RF
>ground?
>And what about my second safety gap- would this also benefit from a
>grounded center terminal?
>
>-Adam
>
>