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Re: MOT Power Supply Questions
Original poster: "Finn Hammer by way of Terry Fritz <teslalist-at-qwest-dot-net>" <f-h-at-c.dk>
Please view in a fixed-width font such as
Courier.
Please view in a fixed-width font such as Courier.
+--------------+-------------+----------------------
| | |
| |------+-------|-----+-------|---------------
|+ |o |+ |o |+ |o
| | | | | |
| | | | | |
uuuuuuuuu uuuuuuuuu uuuuuuuuu
uuuuuu uuuuuu uuuuuu
| | | | | |
| | | | |+ |o
| | | +--------+- |
| |
| <-measure here-> |
Hi Simonas.
Without a scope, you can still phase these transformers. The only thing
that you will miss, is the information about, wether the secondary`s are
in phase with the primary`s. Since that doesn`t matter in this case,
proceed like this:
On all 3 sets, mark the secondary`s with a neutral (o) on one wire.
On one of the sets, mark the primary`s with both neutral (o) and hot (+)
Now arrange the transformers like the schematic above, keping the
neutrals together on the secondary`s, and connect these to the mains.
You should now get about 20 volts on the primary`s.
Now connect one unknown secondary with the reference secondary. If you
get double voltage, the wire that goes to the (+) terminal of the
reference is a neutral (o). If you get about 0 volts, the wire that goes
to the + terminal on the reference is a + wire.
Repeat the procedure on the other unknown transformer, and you are ready
to go.
Hope this helps.
Cheers, Finn Hammer
Tesla list skriver:
>
> Original poster: "Simonas by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<rasim-at-takas.lt>
>
> Yes, I was trying to connect low voltage transformer (~25V) to the primary,
> and as I don't have scope, tried to find hot wire with standart voltage
> indicator (neon one), but it was failure, i don't know why, maybe because
> low voltage transofmer had ferite core, but indicator showed phases on both
> secondary outputs..(and somehow it looked so harmless with only 25V input,
> that I forgot carefullness and touched secondary wires with both hands..
> ouch! ;) ~250V is not very pleasant ;)
> anyway, thanx to all of you for the advices, hope I'll find scope and get
> this thing working in a month or so.. surely, I'll post my screams of joy
> informing all about success and spark length ;)
>
> Greetings from lonely coiler in Lithuania ;)
>
> > Original poster: "Finn Hammer by way of Terry Fritz
<teslalist-at-qwest-dot-net>"
> <f-h-at-c.dk>
> >
> > Simonas,
> >
> > I take it that you intend on running secondary"s in series, primary`s in
> > parallel.
> > To avoid having to measure at excessively high voltages:
> > With the secondary`s connected to the mains, or a low voltage
> > transformer, check with a scope that primary and secondary are in phase.
> > Chose one wire from each set of windings, and mark them as "0",
> > "neutral".
> >
> > Now, on the primary side, connect all neutrals to mains neutral, the
> > other 3 wires to each phase.
> >
> > On the secondary side, connect neutrals, and take the juice out from the
> > other 3 wires.
> >
> > It would be nice to have a 3-phase variac to ramp up voltage slowly,
> > would it not:
> >
> > http://www.helmut-singer.de/stock/936192399.html
> >
> > http://www.helmut-singer.de/
> >
> > Hope this helps, Finn Hammer
> >
>
> > > >
> > > >
> > > >
> > > >
> >
> >