Wouldn't you just have to phase the trannies like you do when your paralleling them?
From: undisclosed recipient via Tesla <tesla@xxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Friday, July 8, 2016 5:44 PM
Subject: Re: [TCML] rewiring for 220v
Each phase is 120* out of sync. so you’d need to get a single phase 120 - 240 step up to keep the phases in sync. which would give you the same current draw.
you could use two different breakers off the same phase (1/2 the current draw per breaker.)
Or just find a couple 240 -15kV NST’s
> On Jul 8, 2016, at 4:20 PM, Reverend Fuzzy <pastor@xxxxxxxxxxxxxxxxx> wrote:
>
> I'd do it... half the current draw on each phase, that way.
>
> ---
> Reverend Christopher "Fuzzy" Mayeux
> Pastor, MSB Ministries
> Hattiesburg, MS
>
>
>
>> -----Original Message-----
>> From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David Boyle
>> Sent: Friday, July 08, 2016 9:59 AM
>> To: tesla@xxxxxxxxxx
>> Subject: [TCML] rewiring for 220v
>>
>> Hi, I have a tesla coil powered by a pair of 15kv 60ma nsts. The
>> secondarys are in parallel to give 120ma. I have a terry filter, a
>> couple of overvoltage gaps and a line filter. The problem is that at
>> 120 volts it pulls over 30 amps. I doubled up my pfc caps from 200uf to
>> 400 and when my Kill-a-watt meter gets here I can see how well that
>> worked.
>>
>> I just lost a gig showing the coil off at the Toronto Maker Festival
>> because the venue was uneasy about supplying 120 volts at 30 amps. This
>> is a recurring problem. So I'm thinking maybe I should rewire my nsts
>> for 220 volts, and maybe these venues will be more comfortable
>> supplying power that way. This makes me think of a couple of questions:
>>
>> How do I connect the core grounds of my nsts when running at 220? Right
>> now they are connected together to supply ground which is kept separate
>> from the coil;s earth ground which is a metal spike or a water pipe
>> that goes underground. And what would be the most sensible male plug
>> style to put at the end of my power cord? Right now I have 12 feet of
>> 10/3 cab tire as a power cord. Thanks for this great list and all your
>> pooled expertise!
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