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 Post subject: Asymmetrical short-circuit current
PostPosted: Sat Nov 26, 2011 2:26 pm 
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Joined: Thu Oct 06, 2011 4:27 pm
Posts: 3
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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PostPosted: Sun Nov 27, 2011 5:13 pm 
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Location: Scottsdale, Arizona
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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