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#140952 05/24/04 06:42 AM
Joined: May 2004
Posts: 16
T
Text Offline OP
Junior Member
What's the difference between 3-phase and V-phase system?Any help? I'm confused.

#140953 05/24/04 12:20 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator

#140954 05/24/04 12:21 PM
Joined: Sep 2002
Posts: 1,498
C
C-H Offline
Member
The latter is simply neutral plus two out of three phases.

#140955 05/24/04 12:22 PM
Joined: Sep 2002
Posts: 1,498
C
C-H Offline
Member
Scott, you beat me to it...

#140956 05/24/04 12:38 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Probably only by milliseconds, C-H.

;-) ;-) ;-)

#140957 07/05/04 09:02 AM
Joined: May 2004
Posts: 16
T
Text Offline OP
Junior Member
Is V-Phase other name is "open Delta"?

Can anybody show me a diagram?

#140958 07/05/04 11:52 AM
Joined: Sep 2002
Posts: 1,498
C
C-H Offline
Member
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? [Linked Image]

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

#140959 07/05/04 02:48 PM
Joined: Aug 2001
Posts: 7,520
P
Member
Well sure.

Someone on earth just might have grounds for wanting to do that! [Linked Image]

#140960 07/05/04 07:14 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
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


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