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#140952 - 05/24/04 03:42 AM What is V-phase system?
Text Offline
Junior Member
Registered: 05/07/04
Posts: 13
Loc: Lipa City, Philippines
What's the difference between 3-phase and V-phase system?Any help? I'm confused.
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#140953 - 05/24/04 09:20 AM Re: What is V-phase system?
Bjarney Offline
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Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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#140954 - 05/24/04 09:21 AM Re: What is V-phase system?
C-H Offline
Member
Registered: 09/17/02
Posts: 1508
Loc: Stockholm, Sweden
The latter is simply neutral plus two out of three phases.
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#140955 - 05/24/04 09:22 AM Re: What is V-phase system?
C-H Offline
Member
Registered: 09/17/02
Posts: 1508
Loc: Stockholm, Sweden
Scott, you beat me to it...
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#140956 - 05/24/04 09:38 AM Re: What is V-phase system?
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Probably only by milliseconds, C-H.

;-) ;-) ;-)
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#140957 - 07/05/04 06:02 AM Re: What is V-phase system?
Text Offline
Junior Member
Registered: 05/07/04
Posts: 13
Loc: Lipa City, Philippines
Is V-Phase other name is "open Delta"?

Can anybody show me a diagram?
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#140958 - 07/05/04 08:52 AM Re: What is V-phase system?
C-H Offline
Member
Registered: 09/17/02
Posts: 1508
Loc: Stockholm, Sweden
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:
http://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).]
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#140959 - 07/05/04 11:48 AM Re: What is V-phase system?
pauluk Offline
Member
Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Well sure.

Someone on earth just might have grounds for wanting to do that!
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#140960 - 07/05/04 04:14 PM Re: What is V-phase system?
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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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