I'm running a 60Hz transformer @ 50Hz here in Germany. Works quite well :)
Regards,
Stefan
----- Original Message -----
From: <Jhowson4@xxxxxxxxxxx>
To: "TCML tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, January 06, 2016 5:17 PM
Subject: Re: [TCML] LTR Primary Cap on tesla coil
The transformer will probably be labled 50\60hz. Its fine to run a 50hz
transformer at 60hz but going the other way, might pose problems. You need
to look at your location to figure out what your wall frequency is. A
quick google search of line frequency in country X, will probably prove
enlightening.
Jim, is their more recent guidance with reguard to the mmc cap chart? I
was under the assumption that the chart was decently well vetted by the
community and sort of a go to standard. Is that still true?
Cheers, Jay
Sent from my Verizon 4G LTE Smartphone
------ Original message------From: p_novotny via Tesla Date: Wed, Jan 6,
2016 9:53 AMTo: Tesla Coil Mailing List;Cc: Subject:Re: [TCML] LTR Primary
Cap on tesla coil
Ok so according to the chart and to your calculations below I'd be
looking for .01uF or 10nF. I have a static spark gap. 15 of the 942C20P15k
in series would get me exactly .01uF. I'll have to check to make sure the
transformer is 60 hz when I get home. Thanks guys.Sent on the new Sprint
Network from my Samsung Galaxy S®4-------- Original message --------From:
jimlux Date: 01/06/2016 7:58 AM (GMT-06:00) To: tesla@xxxxxxxxxx
Subject: Re: [TCML] LTR Primary Cap on tesla coil On 1/5/16 9:48 PM,
Heather & Paul Novotny via Tesla wrote:> Hi, I have a 12,000 v 30ma NST
for my power supply.>> Currently I am using a 5gal bucket cap filled with
beer bottles and saltwater. It measures .01315uF on my multimeter. I am
getting about 12-15" streamers off my toroid with this setup.>> I would
like to try some Cornell Dubilier caps and am wondering what the LTR cap
size would be for my power supply?60 or 50 Hz?"Resonant" is where the
reactance of the capacitor is the same magnitude as the reactance of the
transformer.The transformer reactance is simply E/I or 12,000/0.030 = 400k
(technically, it's j400k, because it's an inductor)The reactance of a
capacitor is 1/(j*2*pi*frequency * C), where j is sqrt(-1). Typically,
you'd see the reactance as -1/(j*omega*C) where omega =2*pi*frequency.what
you want is to rearrange this a bit..400k = 1/(omega*C) --> C =
1/(omega*400k)for 60 Hz omega = 377, so C = 1/(377*400k) = 6.6 nFSo this
is the resonant size (one you actually want to avoid)...You want Larger
Than Resonant (LTR) ... typically 1.5-1.7 x the resonant size, which works
out to 10-12 nF.If you're using the usual 2kV, 0.15 uF caps, 12 of them in
series gets you there-> 12.5 nF @ 24kV or you could use 1600V caps..
that's 19.2 kV, or 13 in series gives you 20.8 kV and 11.5 nFwith a 15 kV
transformer, the peak voltage is 1.414*15= 21.21 kV.>> I saw a formula for
it but I don't know what all of the variable names mean in the formula.>>
Can someone please help me with this?>> Thanks - Paul>
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