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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.