Another thing that occurred to me is that with the coil and panel grounds
separated ,the panel ground is through a long extension cord to the breaker
panel or other line source. At RF, that’s a pretty high impedance. When
next I try this thing I’m going to drive an earth ground at the panel location.
> On Jun 21, 2017, at 5:45 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
>
> Hi Bill,
>
> I also toasted an EMI filter early on in my coiling career. I performed a
> thoughtful analysis of how I had it wired, and discovered that I had it
> hooked up incorrectly. It's not at all obvious what the right way is. I
> wrote up the wrong and right ways with an explanation of what makes each
> right or wrong. Please see http://www.laushaus.com/tesla/emifilter.htm.
> How did you have yours hooked up?
>
> Regards, Gary Lau
> MA, USA
>
> On Wed, Jun 21, 2017 at 1:04 PM, Gomez <gomez@xxxxxxxxxxxx> wrote:
>
>> As part of my effort to build an “ultimate” (to me at least) control panel
>> / primary supply
>> for “My Last Tesla Coil”, I included a corcom type EMI filter in the
>> supply side of the line
>> to try to make the coil as “friendly” a load as possible.
>>
>> During tune up during a recent demo, the primary took a strike, the
>> safety gaps didn’t
>> fire (that I noticed, it was all over in the blink of an eye) and somehow,
>> HV nastiness
>> got past the Terry filter, NST, and torched the filter.
>>
>> During the event _something_ made brief arcing flames inside the panel
>> visible through
>> the ventilation grill, but there’s no side of physical damage to anything.
>>
>> I’ve been scratching my head trying to find the path. All components, the
>> NST, the Terry
>> filter, appear fine. There’s a fine dusting of what looks like smoke
>> residue on some
>> cables, but I’m damned if I can find any arc or penetration marks
>> anywhere. The
>> ground of the coil was to earth and isolated from the supply/panel ground.
>>
>> It seems to me that the strike’s HV had to pass through the Terry filter
>> and the NST
>> to get to the corcom, but then I would expect damage to those parts.
>> Curious.
>>
>> I have some ideas to improve the situation for next time, but I’m now
>> wondering
>> whether anyone makes any EMI/RFI filters with rather high voltage peak
>> ratings.
>> My initial web searches from the usual suspects haven’t turned up any.
>>
>> I suppose I could put a monster industrial MOV unit at the filter, but
>> that seems like
>> a bandaid which will just wear out eventually, the way MOVs tend to do.
>>
>> Ideas?
>>
>> - Bill “Gomez” Lemieux
>> _______________________________________________
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>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
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