What's the difference between 3-phase and V-phase system?Any help? I'm confused.

www.worldbank.org/html/fpd/esmap/pdfs/227_00-Grid%20Extension1.pdf

The latter is simply neutral plus two out of three phases.

Scott, you beat me to it...

Probably only by milliseconds, C-H.

;-) ;-) ;-)

Is V-Phase other name is "open Delta"?

Can anybody show me a diagram?

An open delta is two transformers used to supply three phases:

In an ordinary delta, you have three single phase transformers (or one 3-phase) connected phase - to -phase. Simply remove one of the single phase transformers to create an open delta.

This means you have a limited capacity over the phase which doesn't have a transformer, but it works.

See Scotts drawings in the Reference area:
https://www.electrical-contractor.net/ubb/Forum15/HTML/000054.html

You can create something similar to V-phase by grounding one phase conductor. This is called a corner grounded delta and is sometimes used.

Homework:

Would it be possible to distribute 3-phase with only two wires and two single phase transformers (at the receiving end)? If so, how?

[This message has been edited by C-H (edited 07-05-2004).]

Well sure.

Someone on earth just might have grounds for wanting to do that!

Another reference is Cooper Power Distribution Transformers Bulletin R201-90-2 Three Phase TRANSFORMER CONNECTIONS Compare Figure 21 – “Y-Delta With One Unit Missing “ {Also called open-wye primary} to Figure 15 – “Open Delta for Light and Power.”

See Cooperpower.com R201902.pdf