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Re: [TCML] Re: Tesla Digest, Vol 59, Issue 13

Hey---
They can be wired in parallel to get 120 mA, and that will work well. You just have to get the phase right. If it's wrong, there will be no output. If it's right, you will get a big flaming arc. Be careful measuring the output. Make sure both cases are grounded to the power safety ground (green wire), then use a piece of high voltage wire attached to this ground to draw an arc from the HV terminal. Be careful--120 mA is enough to hurt you real bad. Auto ignition wire with a copper conductor is a good HV wire, or you can get it from a neon sign shop. Good luck--you can make a FINE Tesla coil with these.
If they are wired in series, the center ground taps of the secondaries will short out half of the voltage. The fact that this doesn't work is one of the great injustices that the universe metes out to us poor mortals from time to time. 

Carl
-----Original Message----- From: Nathan Woodhull 
Sent: Sunday, September 16, 2012 9:56 PM
To: tesla@xxxxxxxxxx
Subject: [TCML] Re: Tesla Digest, Vol 59, Issue 13
Hi Tesla fans,I have two 15KV 60ma NST's.Can these be wired in series to get 30KV or wired in paralell to get 120ma?Newcomer Nathan 


________________________________
From: "tesla-request@xxxxxxxxxx" <tesla-request@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Sunday, September 16, 2012 2:00 PM
Subject: Tesla Digest, Vol 59, Issue 13

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Today's Topics:

  1. 3phase convert (jdonges@xxxxxxxxx)
  2. Re: 3 phase to 1 phase conversion (Mark X2)
  3. Current transformer with PLL-Overcoming the phase-shift
     problem (vatercox@xxxxxxx)
a curcuit breaker will trip faster than a hrc fuse, if your really worried a b curve breaker will trip even faster 
Hi all,

we use a . were you use a ,    (but you busted me anyway Brain, since I'm
not consistent if I read back the sentence after that)
I was writing in a reply, that your MG idea is indeed straight forward and
sound. But you already mentioned the IF's and BUT's.
IF I had a generator in my shed , I would've tried, BUT I haven't.  Maybe
search for a High Voltage generator might be even better, if it would
eliminate the need for the HV transformer.

Scotty, and you named it!

Ooh no! I can still taste the smell of burnt silicon, thanks ;)  A 6 or 12
pulse dc coil might be a nice project for a far away future though.

So, If I understand correctly, when connecting a transformer between 2
phases, the RMS voltage simply goes up then (with a factor √2, not? since 3
phase has the factor √3).  What about the current, since each phase is 16A
fused? (never mind, ofcourse, 2 fuses in series, stays 16A fused) Power
output would be 325V x 16A then.
I would say no grounding, use 2 pole transformer for a floating HV and
primary circuit.

It does ring a faint bell, what you mention about tapping in between and I
like this idea the most so far (sorry Brain), since I do have a 5kW 3ph
motor somewhere. Perhaps you would like to elaborate some Dave?

Thanks for your suggestions,

Mark


Dear List,
Re: that fact that the current flowing in the secondary is 90 degrees out of phase with the voltage -which apparently can cause problems with a PLL controller when a current transformer is used to obtain the necessary positive feedback (although I'm not to sure whether or not this applies to a "quadrature" PLL) could this problem not be solved by using a four-phase output divider eg. a couple of 4013 cmos bistable ic wired as a ring or "Johnson" counter to derive rock-solid 90 degree phase shift irrespective of frequency?
Then, with the VCO operating at twice the resonant frequency,the primary could be fed from "0 degree" output of ring counter with the PLL reference input being provided by the "90 degree" output. This would provide a matching signal to the phase-shifted feedback from the current transformer. 

What do you think?


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