I have acquired a big(4kva) three phase transformer. the primary is a star configuration and the secondary a single voltage delta. it is wound on three limbs of an iron core. I can separate each of the primary and secondary windings to give three pairs each wound on a limb of the core. I suspect this is perfectly normal - but I've never looked at one before. Playing (on paper) with the turns ratios, my application of voltage step up from 240 to 415 would be satisified by putting each primary in series across the mains and putting each secondary in series. each winding would get less voltage than originally designed thus not exceeding the original turns per volt.
Provided I connect each winding start to finish in the right order, is there anything to stop me using it in this way?
I've done a bit of a search on three phase transformers but not surprisingly, I've not found anything about using them for single phase applications.
I'd be grateful for any info.
"why is is that I always want to use things for purposes that they were not designed for??"