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 Post subject: Unbalanced delta
PostPosted: Mon Dec 30, 2019 3:56 pm 
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 532
Customer is served with two 50s and a 100 kVA transformer. The 100 kVA is center tapped and grounded to serve the single phase loads. The customer asks for "actual" fault current at the secondary terminals. The only software on hand provides for balanced sources only. How would you go about calculating this by hand? Do you know of any good references? Thanks.


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 Post subject: Re: Unbalanced delta
PostPosted: Thu Jan 23, 2020 7:22 am 

Joined: Thu Jan 23, 2020 7:12 am
Posts: 1
stevenal wrote:
Customer is served with two 50s and a 100 kVA transformer. The 100 kVA is center tapped and grounded to serve the single phase loads. The customer asks for "actual" fault current at the secondary terminals. The only software on hand provides for balanced sources only. How would you go about calculating this by hand? Do you know of any good references? Thanks.


I'm in pretty much the same situation. Did you ever find a solution?


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 Post subject: Re: Unbalanced delta
PostPosted: Thu Jan 23, 2020 8:49 am 
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Joined: Tue Jan 13, 2009 5:00 pm
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Thanks for the bump. No, I have not found an answer.


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 Post subject: Re: Unbalanced delta
PostPosted: Sat Jan 25, 2020 5:12 am 
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Joined: Wed May 07, 2008 5:00 pm
Posts: 822
Location: Rutland, VT
What software are you using? Have you reached out to their tech support for suggestions?

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 Post subject: Re: Unbalanced delta
PostPosted: Mon Jan 27, 2020 9:54 am 
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I use Aspen Oneliner, which can model three phase transformers and systems only. I have not asked support, since it is clearly outside the software's scope. Perhaps Distriview might work, but its not in the budget. The inquiries are rare enough that hand calculations should suffice if I understood just how to perform them.


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