OKay,,,,,the ONLY way you can get three phase low voltage secondary (like 240 3 phase) is if the HV Primary is also three phase and that means theres at least 3 (Delta) sometims 4 (Y) wires up on the HV utility primary.
A transformer can reduce voltage but it doesnt add or subtract phase i.e. single phase HV can be reduced to single phase LV, 3 phase HV = 3 phase LV or perhaps three legs of single phase.
If you see 3 or 4 wires up on the HV primary thats three phase but if you only see two thats single phase
You can still get three legs of single phase LV secondary from 3 phase HV primary which is why you may see 3 or 4 wires on the HV primary in a residential area. If its up there they can supply your home with single or 3 phase service but if only single phase is up there single phase is all you can get
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