Hi Guys! How are you?
My name is Wagner, I'm Electrical Engineering student in Brazil.
It's posible use the Asymmetrical short-circuit current for arc flash calculations? Can I use the asymmetrical current like a safety factor?
Thanks,
Wagner.
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| Author: | wagnerverissimo [ Sat Nov 26, 2011 2:26 pm ] |
| Post subject: | Asymmetrical short-circuit current |
Hi Guys! How are you? My name is Wagner, I'm Electrical Engineering student in Brazil. It's posible use the Asymmetrical short-circuit current for arc flash calculations? Can I use the asymmetrical current like a safety factor? Thanks, Wagner.
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| Author: | Jim Phillips (brainfiller) [ Sun Nov 27, 2011 5:13 pm ] |
| Post subject: | |
Using the asymmetrical short circuit current would be like introducing a very large multiplying factor. If the protective device / arc flash clearing time remained the same as the symmetrical case, then yes this would be conservative and worst case (although I have not heard of anyone doing this). However, using the higher value could lead to a faster protective device operation and lower the overall incident energy. |
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