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#140952 - 05/24/04 06:42 AM What is V-phase system?  
Text  Offline
Junior Member
Joined: May 2004
Posts: 16
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 12:20 PM Re: What is V-phase system?  
Bjarney  Offline
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Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...


#140954 - 05/24/04 12:21 PM Re: What is V-phase system?  
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
The latter is simply neutral plus two out of three phases.


#140955 - 05/24/04 12:22 PM Re: What is V-phase system?  
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
Scott, you beat me to it...


#140956 - 05/24/04 12:38 PM Re: What is V-phase system?  
Bjarney  Offline
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Probably only by milliseconds, C-H.

;-) ;-) ;-)


#140957 - 07/05/04 09:02 AM Re: What is V-phase system?  
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Junior Member
Joined: May 2004
Posts: 16
Lipa City, Philippines
Is V-Phase other name is "open Delta"?

Can anybody show me a diagram?


#140958 - 07/05/04 11:52 AM Re: What is V-phase system?  
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
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? [Linked Image]

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


#140959 - 07/05/04 02:48 PM Re: What is V-phase system?  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Well sure.

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


#140960 - 07/05/04 07:14 PM Re: What is V-phase system?  
Bjarney  Offline
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Posts: 2,527
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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