Re: [TCML] My terry filter capacitors blew up!!

[resonance@xxxxxxxxxxxx]

You never want to run a MMC cap bank with a resonant match value for the
NST --- as you discovered, it will definitely blow up.  When resonance
between the power supply and cap bank occurs, the potentials can
definitely rise to high levels which can blow cap banks and even push
Terry filters to their limit.

You should use approx 1.3 to 1.5 x resonant value for the capacitance.

Also, you have way to few MMC caps in the series string.

You need to run 2.5 x Erms value, ie, with your 15 kV xmfr, then 15 x 2.5
= 37.5 kV DC rating on the MMC for each series string.

37.5 kV DC / 1.6 kV = 23.4, ie, use 25 caps per series string.

Dr. Resonance




> Hello all,
>
> Recently I built an MMC for my medium sized 4.5 inch diameter Tesla coil,
> and the total value for it is .0053uf at around 35,000 volts. This is
> resonant
> for my Magnetek 15kv 30ma NST.
>
> I had a Terry filter on the NST, (i bought the kit off ebay) and when  I
> ran
> the coil, the capacitors on the Terry filter blew up and caught fire. I
> was
> wondering why this is, and also I need to know how I can replace the
> caps.
>
> Do they need to be the exact same kind of capacitors? The  ones that blew
> were .0033uf at 1600v each. There were 12 capacitors in series.
>
> I was wondering if I could use these other caps I had which are  0.015uf
> each
> at 1600v. I have around 20 of those.
>
> Would the extra capacitance make a difference? How does the capacitance
> affect the Filter and in general the whole Tesla Coil?
>
> Sorry if I seem naive to this, but I'm only 14 years old.
>
> I really appreciate this a lot!!!!
>
> Thanks,
> Amir M.
>
>
>
> **************Biggest Grammy Award surprises of all time on AOL Music.
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Dr. Resonance

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