Kirk Wallace wrote:
>
>
> But there is no getting around the fact L1 and L2 are 180 degrees apart.
>
Perfectly normal in any 3-phase situation. Any two points are 180
degrees apart on their own line.
__generated leg
|
/\
/ .\
/ . \
/ . \
/ . \
/ . \
/ | \
/ 207 V \
/ * \
/ | \
/ . \
/ . \
/ . \
/ . \
110V _____________________________ 110V
|
mains Neutral__|
If you measure angle from the star in the center to any two vertoces,
you get 120 degrees.
If you measure voltage from that point, you get 120 V. If you measure
from any line to
any line, you get 220 V. The generated leg comes from the vertical
dotted line, which is
clearly at 90 degrees from the mains, but because the center of the 3
Phase power is NOT
at that neutral point, you DO get the proper phase relationship. This
is the scheme that
makes a Scott-Tee network operate, that a 90 degree phase shift when
applied at the right point
and with the right voltage, does produce a real 3-phase output.
This all assumes a perfectly balanced converter, which may be a rare find.
Jon
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