On Sat, 15 Jan 2011 14:25:54 -0600, dpb wrote:

wrote:
On Sat, 15 Jan 2011 14:03:45 -0600, dpb wrote:

zzzzzzzzzz wrote:
On Sat, 15 Jan 2011 12:45:26 -0600, dpb wrote:

zzzzzzzzzz wrote:
...

No they, in fact, aren't. One is the negative of the other.
Which is the same as a time phase shift of pi radians.

To see so (in Matlab)
Matlab is wrong.
...

Not unless

sin(pi–t) = sin t

cos(pi–t) = –cos t

are no longer identities...

Ok, your understanding of what Matlab is telling you is wrong.

How thinketh thou so?

Math engineering

That's what's happening in the transformer by the
location of the two taps -- taking the voltage at two differing points
along the (single) sinusoidal waveform at the same point in time is the
same thing as a phase shift of one relative to the other.

Nope. Define CT as zero. The signals at each end are the same but opposite
sign.

Again, as noted above it's the confusion between the two meanings of
"phase" -- the (single) electrical generation phase and the phase shift
along that sinusoidal waveform for the two individual voltages.

THen why are you using Matlab as your source?