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 Post subject: Scott Connected Tranfomer Model
PostPosted: Mon May 21, 2012 10:00 am 

Joined: Mon May 21, 2012 9:51 am
Posts: 1
Location: Philadelphia, PA
We have several two-phase transformers in our plant and I need to model them for our arc flash study. I found some old drawings that provide the following data:

2-167KVA TRANSFORMERS SCOTT CONNECTED
13.2 KV 3PHASE TO 240/480V 2PHASE

I am using ESA Easypower but any general guidence would be very helpful.

Thank you!


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PostPosted: Sat May 26, 2012 2:53 pm 
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
Available arc flash models generally consider 3 phase only. Considering that the fault energy is identical for single or two phase cases with L-L faults, the 3 phase model results are still valid.


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PostPosted: Mon May 28, 2012 2:58 pm 

Joined: Thu Feb 04, 2010 5:00 pm
Posts: 36
Location: Camp hill Pa
PaulEngr wrote:
Available arc flash models generally consider 3 phase only. Considering that the fault energy is identical for single or two phase cases with L-L faults, the 3 phase model results are still valid.

PaulEngr wrote:
Available arc flash models generally consider 3 phase only. Considering that the fault energy is identical for single or two phase cases with L-L faults, the 3 phase model results are still valid.

Soud Laskar wrote:
We have several two-phase transformers in our plant and I need to model them for our arc flash study. I found some old drawings that provide the following data:

2-167KVA TRANSFORMERS SCOTT CONNECTED
13.2 KV 3PHASE TO 240/480V 2PHASE

I am using ESA Easypower but any general guidence would be very helpful.

Thank you!


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PostPosted: Mon Jun 04, 2012 10:06 am 

Joined: Wed Aug 31, 2011 5:26 am
Posts: 11
My initial thougth was "open Delta". However, admittedly I've never heard the term, "Scott Connected". Since I'm always eager to learn, I can't wait to fine out what that refers to! Thanks.


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PostPosted: Mon Jun 04, 2012 3:57 pm 
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Joined: Mon Jan 18, 2010 11:35 am
Posts: 523
Location: Wisconsin
A Scott Connection involves the use of two transformers connected in a Tee arrangement which acts as if it was a delta-wye. The Scott connection was designed for going between 3-phase and 2-phase systems, although it has become synonymous with any "T" connection.

The T arrangement is very popular in small kVA ratings (i.e. <30kVA).
A 208Y120 output effectively requires one 240V winding tapped at 50% and 86.7% and the other tapped at 86.7% and 25%.


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