On Friday, July 27, 2018 at 12:26:34 PM UTC-4, wrote:


I defined phase as in single, 2 or 3. You just chose to ignore it.

You gave a definition that is historical, not from an engineering
perspective and you didn't define anything more than 3. You would
think if it's so simple, someone could define it for N phases.
And then you refuse to answer the obvious questions
that even a student would ask a teacher. According to you, two
phase was 90 deg over four wires. OK, so, if it was over 3 wires, using
one shared neutral, would two phases still be present? Now I change
the phase to 179 degrees or 181 degrees, are there still two phases?
Yes? No?

Why then are there not two phases present when it;s 180? The answer
of course is that there still are two phases, it just becomes a less
interesting case.




You found one obscure white paper from a guy who lives in a place that
does not even use center tapped services and he said "split phase" so
you think that is the proper term.

Canada doesn't use center tapped? Maybe Clare can enlighten us, but I
thought they did. At any rate, the company sells power conversion products
into the USA and he did a lot more than just call it split phase, he
went through an analyis of it and how there are two 180 deg phases
present.


But more importantly, did you not see the presentation at a US power
industry conference that I provided? It's right here in the good old
USA and it's a detailed analysis of
exactly what we're talking about by an IEEE Fellow with 40 years
experience.

Here it is again:


Here, I found the presentation I referred to. It was made by a power
system engineeing professor with a career going back to the 60's.
He consults on power system, the presentation was made at a
power engineering conference and it's published by the IEEE,
he's a Life Member of the IEEE. He last worked for Milsoft
Utility Solutions, that does consulting for power utilities. He doesn't
sound like a stupid guy or a homeowner.

https://ieeexplore.ieee.org/document/4520128/

Abstract:
Distribution engineers have treated the standard "singlephase" distribution transformer connection as single phase because from the primary side of the transformer these connections are single phase and in the case of standard rural distribution single phase line to ground. However, with the advent of detailed circuit modeling we are beginning to see distribution modeling and analysis being accomplished past the transformer to the secondary. Which now brings into focus the reality that standard 120/240 secondary systems are not single phase line to ground systems, instead they are three wire systems with two phases and one ground wires. Further, the standard 120/240 secondary is different from the two phase primary system in that the secondary phases are separated by 180 degrees instead of three phases separated by 120 degrees. What all of this means is that analysis software and methods must now deal with an electrical system requiring a different set of algorithms than those used to model and analyze the primary system. This paper will describe the modeling and analysis of the single-phase center tap transformer serving 120 Volt and 240 Volt single-phase loads from a three-wire secondary.

W. H. Kersting
Milsoft Utility Solutions, USA
W. H. Kersting (SM'64, F'89, Life Fellow 2003) was born in Santa Fe, NM. He received the BSEE degree from New Mexico State University, Las Cruces, and the MSEE degree from Illinois Institute of Technology. He joined the faculty at New Mexico State University in 1962 and served as Professor of Electrical Engineering and Director of the Electric Utility Management Program until his retirement in 2002. He is currently a consultant for Milsoft Utility Solutions. He is also a partner in WH Power Consultants, Las Cruces, NM.



You can read it here as a Word document:

https://www.researchgate.net/profile...condary-Models


It's crystal clear that he agrees with my analysis, but go ahead feel
free to disparage him as a homeowner idiot.




In another thread we did talk about split phase motors but they are
still operating on single phase.

I agree with that.