[TCML] MMC for 4 mot SRGTC
bartb at classictesla.com
Sat Apr 5 21:29:19 MST 2008
The MOT stack is 1050 VA per xfmr x 4 xfmrs = 4200 VA's total, not 16800
(but 16800 would be the impedance in ohms). Were looking at about 35A
continuous line current that will surge beyond 35A frequently (I
recommend a 60A breaker). I also recommend ballasting, but at 7.5A per
MOT for a total of 3600VA across the stack (900VA per MOT).
DC Cox wrote:
> 8300 volts at 0.5 Amps is 4200 Watts per xmfr x 4 xmfrs = 16,800 Watts.
> First, your MOTs usually can not run wide open. Best to ballast each MOT at
> around 16 Amps each. This provides 120 x 16 Amps x 4 xmfrs = 7,680 Watts.
> I have cores for cheap MOT ballasting --- contact me off-list and I can
> advise on this.
> 7.68 kVA would only require approx 0.1 uF max but you could survive with a
> .07 to .09 uF range cap for good performance. 0.4177 is too much cap for
> the xmfr. I run my Big Bruiser at 26 kVA, pole xmfr powered, and it tunes
> fine with a 0.3 uF cap. This coil is 24 inch dia with a 10 ft dia. mesh
> toroid. 0.4 uF is way too much for your system.
> Dr. Resonance
> On Sat, Apr 5, 2008 at 8:49 AM, Kris Grillo <kristianisawesome at yahoo.com>
>> I am putting together a 6" coil with 4 MOT power supply and a 120 bps sync
>> rotary gap. I would like to run the mots wide open (no ballast). I
>> estimated 8400 V .5A for the transformer output. For the MMC, JavaTC is
>> saying I need .4117uf for LTR! That seems huge to me. I have 60 of the 942's
>> for 5 strings of 12 right now, and I planned on doubling that to get to
>> .1249uf before I get it up and running, but that is still less than
>> resonant. I could probably swing another 84 caps to get to 12 x 12 for a
>> just about resonant cap, but 336 more caps for the .4117uf value is a little
>> out of my price range right now. Is it so important to run larger than
>> resonant cap with a mot driven srg coil? The mots are under oil, if that
>> matters. Any suggestions?
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