Re: Three phase transformer
The secondary winding voltage will depend on who designed the power supply, and what they allowed for mains supply regulation (eg. -5%), transformer regulation (eg. 90%), and diode voltage drop (eg. 2V). If it was a delta secondary, that would give about 22.5V per winding with my design tool, so likely about 13V for a wye configuration.
As far as I can see, with a single phase 230V supply energising two of the primary windings (connected in parallel across the mains supply), that would provide about 26V of unloaded 'secondary voltage' per transformer, so 104V unloaded from four transformers.
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