Re: first post (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 15 Aug 2007 22:41:26 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: first post (fwd)



You need 2.5 x Erms if you want them to last.   7 won't cut it --- the 
corona inside the cap will eat it up.

9 kV x 22.5 kV     22.5 kV / 2 kV / cap  =   12 per string.


Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, August 15, 2007 12:59 PM
Subject: Re: first post (fwd)


>
> ---------- Forwarded message ----------
> Date: Wed, 15 Aug 2007 13:00:10 -0500
> From: Crispy <crispy@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: first post (fwd)
>
> Hmm, by my calculations, you'd only need 7 per string.  The caps are
> rated at 150nF, 2kV each, if I recall.  9000Vrms is about 12730V peak.
> Divided by 2000V per cap and rounded up comes to 7 caps per string.
> This alone is more than the 15nF you want.  If you want exactly 15nF,
> you can use one string of 10, and have a healthy voltage margin as well.
> On ebay, the ebay store TeslaStuff sells lots of 12 of these caps for
> under $50.
>
> Hope this helps,
> Chris
>
> On Wed, 2007-08-15 at 11:05 -0600, Tesla list wrote:
>> ---------- Forwarded message ----------
>> Date: Wed, 15 Aug 2007 12:07:09 -0500
>> From: Terri Neeley <neeley_111@xxxxxxx>
>> To: tesla@xxxxxxxxxx
>> Subject: Re: first post (fwd)
>>
>>
>> Exactly what Mr. Lux said.  Many people have used these transformers with
>> success and I thought it could be a cheaper alternative than stacking
>> nst's.  The transformers I have are 4500v 450ma btw.  So if you use Jim
>> Lux's config you essentially split the current between the two and double
>> the voltage.  I will be using a synchronous rotary gap.  My question is
>> are there really any alternatives to CD942's?  What about wima fkp1's?
>> They seem to be much cheaper considering the cd's are over 3 bucks a
>> piece and I would need 6 strings of 18 of the .015mF for this coil.  I'm
>> just very new to this and I really just want a cap or mmc that will be as
>> reliable as reasonably expected to be.  Any really good alternatives
>> besides the CD's?  There gonna set me back at least 350$ for them.
>>
>> Garry Neeley
>>
>> ________________________________________________________________________________
>>
>>       From:  "Tesla list" <tesla@xxxxxxxxxx>
>>       To:  tesla@xxxxxxxxxx
>>       Subject:  Re: first post (fwd)
>>       Date:  Wed, 15 Aug 2007 10:23:54 -0600 (MDT)
>>       >
>>       >---------- Forwarded message ----------
>>       >Date: Wed, 15 Aug 2007 09:16:18 -0700
>>       >From: Jim Lux <jimlux@xxxxxxxxxxxxx>
>>       >To: Tesla list <tesla@xxxxxxxxxx>, tesla@xxxxxxxxxx
>>       >Subject: Re: first post (fwd)
>>       >
>>       >At 08:38 AM 8/15/2007, Tesla list wrote:
>>       >
>>       > >---------- Forwarded message ----------
>>       > >Date: Wed, 15 Aug 2007 08:29:08 -0700
>>       > >From: huil888 <huil888@xxxxxxxxxxxx>
>>       > >To: Tesla list <tesla@xxxxxxxxxx>
>>       > >Subject: Re: first post (fwd)
>>       > >
>>       > >Terri -
>>       > >
>>       > >First question is about your HV power supply transformers.
>>       These are
>>       > >nominally rated at 4500 volts RMS, 400ma. I assume that
>>       you intend to
>>       > >connect them in series to obtain 9KV RMS AC output?
>>       Peak-to-peak voltage
>>       > >will be about 12.7KV.  Are you sure that the transformer
>>       insulation will
>>       > >withstand this? One good flashover at this much current
>>       may destroy the
>>       > >transformers.
>>       > >
>>       > >How will you limit secondary the current to 225ma?
>>       >
>>       >I think that the plan is to cascade the two transformers in
>>       series,
>>       >using the 600V tertiary winding, so the "high" transformer's
>>       core is
>>       >floated at 4500V.
>>       >
>>       >These things have a fair amount of leakage inductance, so
>>       the output
>>       >current is limited.
>>       >
>>       >
>>       >
>>       >I built a similar cascade, using 4 transformers: two
>>       cascades, with a
>>       >center ground, and it's in many respects like a giant NST.
>>       >
>>       >
>>       >
>>       >
>>
>>
>> ________________________________________________________________________________
>>
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