On Sun, 13 Feb 2005 13:47:19 GMT, Lancer wrote in
:

On Sun, 13 Feb 2005 03:47:46 GMT, "U Know Who"
wrote:


"Frank Gilliland" wrote in message
. ..
On Sat, 12 Feb 2005 07:18:49 -0800, Jay in the Mojave
wrote in :

Hello All:

Looking for a good sized power transformer.

Needs a 220 or 440 3phase input, any where from 5200 to 5500 Volts out
at 4 to 5 amps. Will be using a input choke power supply so that will
keep the Plate Voltage at the manufacture spec's of around 5 grand on
the plates.


You might have better luck running single-phase, then all you would
need is a small pole-pig that you can get for a couple bills in just
about any well-stocked junkyard. Otherwise you will probably have to
roll your own, which can get quite expensive (iron, copper, oil, can,
vacuum pump, etc). So how much are you planning to spend on this
transformer?


Good call, Frank. A single phase, 15-25KVA pole pig, standard residential
has 240 volt input, and should work nicely. Incidentally, all three phase is
240, 277, or 480. There is no more 220 or 440, unless you change the taps or
rewind one. Much like the mis-stated 110, which is actually 120.


I don't think thats totally true Randy. I installed a BGA solder
station that required 240. The only circuit I had open was a 3 phase
circuit. Only 208 volts betwwen legs, I had to put a buck/boost
transformer on it to get the voltage up to 240 to get it to run
correctly.

Most local transmission voltages are 44 kV, 27.6 kV, 13.8 kV and 6.9
kV. A little higher than what Jay was looking for.


The voltage isn't as important as the ratio; i.e, you can run a 480
volt transformer at 240 to get a lower output. And since older pigs
came in all kinds of sizes and ratios, you never know what's available
until you look.






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