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#127554 - 08/23/01 10:51 PM crazy 3 phasy  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
Ok, We all know 2 X-formers and 3 hots can do an open delta, but.......
Can 3 X-formers and 2 hots be configured into some sort of 3 phase arrangement?

According to one source , this is called a 'scotch-something...'

[Linked Image]


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#127555 - 08/24/01 08:38 PM Re: crazy 3 phasy  
Redsy  Offline
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Joined: Mar 2001
Posts: 2,056
Bucks County PA
You are referring to a Scott connected configuration, in which a 3 phase primary is connected to two transformers in such a manner that 2 phase power is availableon the secondary. This information is available in McGraw-Hill's "American Electricians Handbook"


#127556 - 08/28/01 08:58 PM Re: crazy 3 phasy  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
hmm;
i see it in the index, but not in the book, go figure.... [Linked Image]


#127557 - 08/28/01 09:33 PM Re: crazy 3 phasy  
Redsy  Offline
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Joined: Mar 2001
Posts: 2,056
Bucks County PA
Quote
Originally posted by sparky:
hmm;
i see it in the index, but not in the book, go figure.... [Linked Image]


Sparky,
What edition do you have? I'm home and my 11th edition discusses this beginning on page 5-55. There is a diagram on page 5-57. When I go in tomorrow, I'll check my other(newer) edition.


#127558 - 08/28/01 09:54 PM Re: crazy 3 phasy  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
well I have a 13th, the index says it's at 5-92 to 5-94, which is just a lot of stuff about drying X-formers


#127559 - 08/29/01 07:21 AM Re: crazy 3 phasy  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Quote
Originally posted by sparky:
well I have a 13th, the index says it's at 5-92 to 5-94, which is just a lot of stuff about drying X-formers

I have the 13th, also.
The index is confusing. It refers to sections, not pages. Look at SECTION 5-92 on PAGE 5.67


#127560 - 08/29/01 12:58 PM Re: crazy 3 phasy  
George Corron  Offline
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Joined: May 2001
Posts: 717
Lorton, Va USA
Designed to replace the Edison 3 wire DC hook up when swapped over to AC. Unless you work around coal mines (DC equipment runs on AC or batteries) you'll never see one. coal mine info is old, don't know if they still do it that way.


#127561 - 08/30/01 06:34 AM Re: crazy 3 phasy  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
Look at SECTION 5-92 on PAGE 5.67
Dohh! Homer Simpson....
Ok, so I can't use my own book! [Linked Image]

anywho,
there it be, stange animal that it is. Could this be used in reverse? I.E.- get 3 phase 208V out of 2--4160V high legs?
that was the description I got from my 'source'


#127562 - 08/30/01 08:51 AM Re: crazy 3 phasy  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
According to my engineering books the Scott connection is normally used for 2-phase to 3-phase conversion. If used in a 3 to 2 conversion the transformer output needs to be reduced to 86.6% of the combined single-phase ratings.


#127563 - 08/30/01 08:57 PM Re: crazy 3 phasy  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
JBD,
can you elaborate?
the particular situation here was a linesman stating that 2 out of 3 phases were available at a job, and 3 ph was created via this 'Scott' configuration.


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