Oh wizards of polyphase power, please accept this virtual offering of three different but oddly related single-malt whiskys and prevent Fried Fred.
I (will shortly) have an engine-driven 3-phase 220V generator of roughly
20kW capacity. [On Topic: this is a half-ton of metal and it will be used to power metalworking Stuff!] For one of its several duties I would like to use it to power the household during outages. It is 3 phase, the household is single phase at the same voltage.Now for the half-baked part: If I were to take a suitably sized laminated iron donut, wrap a goodly number of turns of stout wire around it and connect the two ends of that wire to each other, install three taps to the winding spaced at 120 degrees (measures in turns) and label them 'Input', install two more taps at mutual 180 degrees and label them 'Output' ...
would I have a device to pull single phase from three phase (delta connected autotransformer) or merely a short-lived heater?
Also, I would like to think of the neutral for the 3-ph as the neutral for the single-phase but I can't prove to myself why it would be. A 'Y' connection would make that more explicit but then I can't figure out the
180 degree taps and phase load balancing.Neither my references or Google helped and I'm about ready to build a baby version to check my thinking; asking Those Who Know seemed more effective. Thanks.