Re: Combining dual secondaries of a toroidal transformer


"Michael A. Terrell" <mike.terrell@xxxxxxxxxxxxx> wrote in message
news:45D93E1A.4EB26B64@xxxxxxxxxxxxxxxx
Jon Slaughter wrote:

"Peter Bennett" <peterbb@xxxxxxxxxxxxxxxxx> wrote in message
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On Sun, 18 Feb 2007 07:11:37 -0600, "Jon Slaughter"
<Jon_Slaughter@xxxxxxxxxxx> wrote:


<furtherside@xxxxxxxxx> wrote in message
news:1171770731.461084.227630@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi, I have a fairly good sized toroidal transformer that has two
pairs
of primaries and two pairs of secondaries. The inputs are both 115V
and the outputs are both 33V, at 7A. I'd like to combine the outputs
in parallel, to give me 33V at 14A.

I have some questions.

1. The label on the tranny says PRI1 = blue/white PRI2 = black/grey
SEC1 = orange/yellow SEC2 = red/green

So...do I assume that to keep the secondaries in phase, that "orange"
should be tied to "red" and "yellow" should be tied to "green" --
since that's the way they are ordered, on the label? (i.e., do I
trust the label to indicate phasing?)


Nothing much should happen if you get them backwards. The MMF is just
going
to push the currents in such a way that they oppose each other and you
get
no current. It might heat up but if you don't push much through it then
you
should be able to test. What you can do is hook up a fairly large load
and
a
volt meter and then check both phases and see which one gives you the
larger
voltage.

NO!!!

If the secondaries are parallelled incorrectly, he will have a short
circuit, and huge currents will flow through the windings.


hmm, thats why I said to add a load. If the two secondaries are out of
phase
and have exactly the same reactance then there will be no current flow
with
or without a load.

If you take the two secondaries and put them in series the same effect
will
happen but you will need a load incase they are in phase. (or you could
just
measure the voltage, you will either get twice the voltage of one
secondary(assuming they are equal) or 0.)

If he doesn't think they are equal then its still easy to tell. You
either
get +-(V1 + V2) or +-(V1 - V2). He can tell quite easily if they are in
the
correct phase by using series or not. (because if they are in the same
phase
then they can only add there voltages together. Ofcourse this assumes
that
one of the secondaries are not to much greater than the other)

If he wants to use test using parallel then he should add a load to both
secondaries and then, say, use a current meter to measure the current.
The
same stuff applies above but with current. (or he could measure the
voltage
on the resistor).

The fact is that either they will work with each other or against each
other. As always you have to be careful about shorting things out.



A load across a short circuit? Its back to "Electricity 101" for
you.


ITS NOT A FUCKING SHORT IF THEY ARE OUT OF PHASE IN PARALLEL OR
SERIES(assuming no load).

Jesus christ. What happens when you hook up two identical batteries up in
series out of phase? in phase? (ABSOUTELY NOTHING BECAUSE THERE IS NO
CIRCUIT) What happens when you hook them up in parallel out of phase?
ABSOLUTELY FUCKING NOTHING! (but there is a circuit)

What happens when you hook them up in parallel in phase? THEN YOU GET A
SHORT!!! AND THIS IS WHY I SAID IN MY ORIGINAL POST YOU SHOULD ADD A LOAD.
Ofcourse you fucking neglect that part because you want to start some ***.
I guess your life is so boring that the only way you can have some excitment
is to get on sci.electronics.basics and start arguments by being
illogical(ignoring half the sentence so that the other have then becomes
wrong).

Did you guys actually ever goto school or just pretend? Cause I can't
imagine that your professors would pass you if you only did the parts of the
tests that you wanted.




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