Re: MMC size and rotary gap (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 16 May 2007 18:39:34 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: MMC size and rotary gap (fwd)

Hi Andrew,

Ok, so going with a rotary (SRSG). Your MMC LTR values are correct for 
both cases. It's really up to you. When money is the deciding factor, 
weigh the $30 for the 3rd NST to the difference in caps for the two 
cases. Likely, you will be pretty much at a wash for costs. Labor may 
really be the deciding factor.

I personally would go with the 15/60 due to the cap labor and cost and 
due to a single NST (more compact and physically practical).

Take care,
Bart

Tesla list wrote:

>Original poster: List moderator <mod1@xxxxxxxxxx>
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>---------- Forwarded message ----------
>Date: Tue, 15 May 2007 20:40:20 -0500
>From: Andrew Nettles <anettles@xxxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: MMC size and rotary gap
>
>I'm trying to decide if I should use three 9kV 30 mA transformers or go 
>ahead and spend the money and buy a 15 kV 60 mA.  I know the latter would 
>provide a little more power, but I already have two Franceformers that are 
>matched and I can buy another one for $30.  I'm also not sure about removing 
>the GFI from the higher voltage Franceformers (I think it's easy, just not 
>sure).
>
>So thinking about building the MMC.....I'll be using a 120 bps SRSG.  
>According to some stuff I've read, I should use a LTR cap of 2.5 to 3 times 
>the Cres - right?  So for the 3-9kv, I would need 66nf (26.5 x 2.5) or if I 
>bought the bigger transformer I'd need 27nf.
>
>I'm trying to figure out which would be the cheaper/better way to go since I 
>might end up spending so much more on capacitors that I should have just 
>bought the bigger transformer.  Any input on this?
>
>Thanks,
>Andrew N
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