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ekstra   ara
 Post subject: Duke Calculator
PostPosted: Thu Dec 10, 2009 6:55 pm 
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Joined: Mon Dec 07, 2009 9:01 am
Posts: 1
Location: Rochester
I just read that the Duke Calculator is only for single phase faults in open air. I have been using it on switchear with 3 phase bolted fault data; Is this a problem and does anybody have the new NESC table?


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PostPosted: Thu Dec 10, 2009 7:35 pm 
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Joined: Sun Dec 23, 2007 1:44 pm
Posts: 348
Location: Charlotte, NC
If you are talking about the Duke Flux free program then I would say yes that is a mistake.

If you need 3 phase calcs, at least use the 1584 calculator.

Would seem that given your question, you just might need some help with you analysis.


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PostPosted: Sat Dec 12, 2009 5:54 am 
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Joined: Sun Jan 04, 2009 5:00 pm
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Location: Louisville, KY
Duke Calculator for 3Phase Calcs.

Alan is right the IEEE 1584 data is more specific to the instance than Duke. Duke calc was developed in early nineties for use on utility medium voltage systems. It is based on about as much data as 1584 but only in medium voltage then extrapolated up and down in all directions. it is more accurate for a medium voltage arc but we prefer to use ArcPro for medium voltage since it has much more data and is based on an arc physics model for open air arcs.

The IEEE 1584 model is the best we have for 3 phase low voltage. You can use Duke with a 3 Phase multiplier and come out pretty close but 1584 is a little more straightforward. The fact that you can use Duke shows you are pretty sharp. We never do calcs by hand anymore. We prefer to use modeling software. Many companies have good software and IEEE 1584 is built in. We use SKM, EDSA, ETAP and EasyPower depending on the system.


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