Re: Fried Caps? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 26 Oct 2007 15:08:14 +1000
From: Chris P <darkness06660@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Fried Caps? (fwd)

On Fri, 26 Oct 2007 13:28:13 +1000, Tesla list <tesla@xxxxxxxxxx> wrote:

try having your MMC with the caps in little "packs" IE 7 caps all in  
parallel then put 11 of these parallel "packs" in series. You might have  
some caps that have different internal resistance, so they see a much  
higher voltage than the rest. The "pack arrangement" will help to even  
this effect out. as will a bleeding resistor across each "pack"


>
>
> ---------- Forwarded message ----------
> Date: Thu, 25 Oct 2007 23:11:59 -0400 (EDT)
> From: Victor Valencia <victor_valencia2@xxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Fried Caps?
>
>  Hi,
>
>   I have a pretty basic TC that I built
> a couple of years ago.  It worked great
> in the beginning but I am having issues
> with the Tank Cap.  Here are the
> design parameters:
>
> NST 12Kv, 30mA
> Spark Gap: copper tube-based, 9 gaps with @20 mils/gap
> Tank Capacitor: 77x GE 42L 3kv, (7 strings of 11 caps) (.0066 uF total)
> Secondary Coil - 3.25" diameter, 801 turns 24 awg wire
> Top Load: 4.5" diameter aluminum ducting. total dia = 15"
>
> The problem I am having is that random capacitors just seem
> to heat up, melt, and/or catch on fire (lovely show, pic
> attached)
>
> Should I reduce my gap?  I thought that a 12kv
> input with 33kv for each cap string would be enough of
> a safety factor.  Is there some minimum spacing
> I should keep between the adjacent capacitors and/or
> the caps in the next string?
>
> Victor
>
>
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