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 Post subject: Gap between conductors and distance, X factor for 15kV - 132kV
PostPosted: Sat Aug 29, 2009 11:46 pm 
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i found that IEEE 1583 provides the gap and distance information for 15kV below.May i know how to find the gap between conductors (mm) and distance, x factor for 33kV and 132kV?

Thank you....


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PostPosted: Sun Aug 30, 2009 7:24 pm 
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Above 15kV, you can't use the IEEE equations based on the stuff they blew up and the associated statistical analysis.
You must use the theoretical IEEE equations which is simpler and doesn't have the X factor and gap.


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PostPosted: Mon Aug 31, 2009 6:20 pm 
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Dear Vincent,

Sorry that i didn't get your point. Do you mind to mention the theoretical IEEE equations which are used to calculate the incident energy for the 33kV and 132kV? Thousand thanks.

Yuna


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PostPosted: Mon Aug 31, 2009 6:29 pm 
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See Equations D.7.4 and D.7.5(b) in Annex D of NFPA 70E-2009.


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PostPosted: Mon Aug 31, 2009 7:10 pm 
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Dear Vincent,

i only manage to download the IEEE 1584 from my university. I fail to get the NFPA 70E-2009. can you write up the equaption? where can i manage to get the NFPA 70E? Thanks a lot...


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PostPosted: Tue Sep 01, 2009 2:16 am 
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There's supposedly a view-only version available from the NFPA (http://www.nfpa.org). Else you can buy it (pdf or paper) at the same location.

I never had access to the full IEEE 1584, only what is quoted in NFPA 70E. So I can't tell you what are the equations number in it.


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PostPosted: Mon Sep 14, 2009 10:55 am 
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check Help file for Arc Flash Analytic v5.0 for 15kV+ system equations.

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Michael Furtak, C.E.T.
http://arcadvisor.com


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