RE: V11.1 for JAVATC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 30 Aug 2007 21:24:31 -0000 (GMT)
From: huil888@xxxxxxxxxxxx
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: V11.1 for JAVATC (fwd)

> Tony -

Remember that the "15kV" output of your NST is the RMS voltage, not the
actual peak-to-peak voltage. It's the peak voltage that puhches through
capacitor dielectrics, flashes across MMC capacitors that are mounted too
closely together, etc. The "peak" voltage for your 15kV NST (assuming
117-120 VAC input) will be 15,000 X 1.414, or over 21,000 volts. At the
very minimum, build your MMC to withstand this voltage. Much better design
practice is to build with additional safety margin, 1.5X or 2.0X would be
more conservative, depending on how much risk you feel comfortable with. I
have unwound "overvolted" C-D 942 capacitors and examined them under a
stereomicroscope, and I assure you that they suffer internal damage
(dielectric pinholes and vaporized electrodes)that will cause their
capacitance value to slowly decrease and eventually they will fail
completely. I'd rather build a MMC that costs more initially, but would
have a long life, and when I wanted to reconfigure the MMC or re-use the
capacitors for a different project have confidence that they were not
already damaged.

Regards,
Scott Hanson
> ---------- Forwarded message ----------
> Date: Wed, 29 Aug 2007 17:39:08 -0700
> From: Anthony R. Mollner <penny831@xxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: RE: V11.1 for JAVATC (fwd)
>
> Hi David,
>   Well, that seems to be what I've discovered as well. Now it's time to
> put
> a s@#t load of CDE caps together. What's the consensus on the voltage
> level
> for each string? I have heard of some guys running those 942C caps right
> at
> the transformer AC output, in my case 15kv but, that really doesn't sound
> wise to me. On the other hand, running strings of 21+ will cost an arm and
> a
> leg and various other body parts that I'd like to hang on to! So, what
> does
> everyone think would be nice and safe?
>
> Tony
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Wednesday, August 29, 2007 5:47 AM
> To: tesla@xxxxxxxxxx
> Subject: RE: V11.1 for JAVATC (fwd)
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 29 Aug 2007 12:44:50 +0000
> From: David Rieben <drieben@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Cc: drieben@xxxxxxxxxxx
> Subject: RE: V11.1 for JAVATC (fwd)
>
> Hi Tony,
>
> Well, let's see. 60 Hz mains resonance with a 15/120 transformer(s) is
> about .02 uFd and the general consensus on capacitor size with SRSGs
> in NST systems is about 2.8X resonant capacitance value, that would
> come out to .056 uFd. So .055 uFd sounds just about "right on the mo-
> ney" to me :^)
>
>
> David Rieben
>
> -------------- Original message --------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>
>>
>> ---------- Forwarded message ----------
>> Date: Tue, 28 Aug 2007 07:23:48 -0700
>> From: Anthony R. Mollner
>> To: Tesla list
>> Subject: RE: V11.1 for JAVATC (fwd)
>>
>> I like this program, it's a real time saver. I was surprised at the
>> capacitor value it figured for my set up. I'm running a 15/120 input
>> with
> a
>> SRSG and the value that JAVATC gave me of .055 for LTR. This was a lot
>> higher than I would have imagined, does that sound right?
>>
>> Tony
>>
>>
>>
>>
>
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>