Based on the subject, I think he wants to use it as a ballast. I have one of these:
https://www.ebay.com/itm/Cutler-Hammer-H48M28T30A-30-KVA-3-Phase-480X120-208-Volt-Transformer-T1307-/272644862217
yet mine was free and even delivered to my garage. 480 delta to 208Y/120 30 kVA.
I've always wanted to use it for a saturable reactor, but it's pretty much collecting dust for now. I don't coil as much as I used to. Like David Rieben, my son's moved out, and last year we didn't have even one trick-or-treater.
On Monday, February 12, 2018, 8:52:58 PM EST, David Speck <Dave@xxxxxxxxxxxxxxxx> wrote:
Jay,
Aside from the three phase issue, I assume that you would be planning to
feed 120 or 240 VAC into the 36 volt windings in an attempt to get a
higher voltage (~2,300 VAC) out of the original 440 VAC terminals.
I would not expect the transformer to last very long in this mode of
operation, because the windings would not be insulated to handle such a
high voltage. Furthermore, 2,300 volts is not a particularly high
voltage to run a TC with. You can get nearly the same voltage out of an
ordinary microwave oven transformer that was designed to handle such a
voltage comfortably for extended periods.
Two such MOTs connected together in series at their usually grounded
cores would give you ~4,000 volts, but even that is rather low for TC
use, unless you are going for a DC resonant charging system.
Dave
On 2/12/2018 6:33 PM, jhowson4 wrote:
> So, I have this huge 3 phase transformer that was slated to step down 480 to 36V at 600 or so amps.
> My lack of 3 phase power has led me to wonder if I could use the transformer as a single phase input output via keeping/using only one set of the windings.
> Has anyone used a 3 phase transformer as a single phase unit via isolating the unused coils and simply running just the middle leg?
> Cheers, Jay
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