Hi John,
A 15/60 by itself is 15000 x 0.06 = 900 Watts. A combination that is essentially 12/90 would be 12000 x .090 1080 Watts so there is a small gain, but you would have to reconsider that that peak voltage attainable is going to be lower and design on that.
Matt D
-----Original Message-----
From: John Cooper <wt5y@xxxxxxxxx>
To: mddeming <mddeming@xxxxxxx>; tesla <tesla@xxxxxxxxxx>
Sent: Wed, Dec 3, 2014 4:52 pm
Subject: Re: [TCML] Phasing NST ?
So would a 15kv 60ma be better by itself vs running the 15kv 60ma with a 12kv 30ma?
Sent from my Cricket smartphone
-------- Original message --------
From: mddeming--- via Tesla <tesla@xxxxxxxxxx>
Date: 12/03/2014 10:08 (GMT-06:00)
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Phasing NST ?
Actually, phasing has nothing to do with either the voltage or the current. Phasing is making sure
that the transformers are not fighting each other. (Think two batteries in parallel, but one put in
backwards). Jim is right that here is no problem of mixing 30 ma and 60 ma units.
Mixing 15kv with 12kv units works with negligible additional stress, but performance will be closer
to that of 2-12 kv units. I would not recommend mixing say, 15 kv NSTs with 7kv NSTs.
Matt D.
-----Original Message-----
From: Jim Lux <jimlux@xxxxxxxxxxxxx>
To: tesla <tesla@xxxxxxxxxx>
Sent: Wed, Dec 3, 2014 8:45 am
Subject: Re: [TCML] Phasing NST ?
On 12/3/14, 2:55 AM, John Cooper wrote:
> Phasing NST requires you matching the voltage. So two 12kv or 15kv together.
But no where have I found if you need to match the current rating? Can I run a
12kv 30ma with a 12 kv 60ma for a total of 90ma? I was thinking they would act
like batteries and the higher current one would try to charge the other.
>
Actually, no.. you can put a 30 and a 60 in parallel. A NST is like a
ideal transformer in series with a huge inductor to produce a sort of
constant current source. The impedance of the inductance is about 500k
for a 30mA/15kV unit.
If you want to compare to batteries, etc., think of a 15kV battery with
a series 500k resistor in parallel with a 15 kV battery with a 250k
resistor.
There's no current flow from battery to battery because they're the same
voltage.
Interestingly, you can also calculate what's going on when you have 2
different *voltages* in parallel. It turns out that it works. Yes, at
"no load" there's current flow from one to the other (although it will
be mostly reactive current, so not dissipating much power). But as soon
as you start to load the output, both transformers supply power.
Jim
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