"DJ Delorie" wrote in message
...
"Martin H. Eastburn" writes:
Your one high voltage (really medium or somewhat low for service) is
SNIP ..........
There are unique transformers that can generate twisted star
voltages and phases

No, they can *convert* voltages that are already three phase to other
three phase voltages. They come in delta and wye configurations. An
isolation transformer can extract one of the phases and yield a single
phase service, but no simple transformer can turn N phases into N
phases.

but the are not at homes.

Maybe not *your* home.
==============================
Technically true, but in practice, a wye primary can be used with a delta
secondary allowing, when rectified, a 12 pulse output rather than the 6
pulse of either the dellta/delta or wye/wye. This feature is used in X-ray
generators to achieve near DC levels at the X-ray tube.

Ken Moon
Webberville, TX.