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 Post subject: IEEE 1584-2018 - Annex D
PostPosted: Fri Jan 18, 2019 12:04 pm 
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Joined: Fri Jan 18, 2019 11:47 am
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Hello all,

I have a specific question in context to the new IEEE 1584-2018 - IEEE Guide for Performing Arc-Flash Hazard Calculations’ standard.

There are a couple of equations in Appendix - D, equation numbers "(D.101)" and "(D.104)" in pdf page number 74.

In both these equations (D.101 and D.104), they specify a term 'k3*Iarc_600' in the numerator and calculated the final values with respect to it, whereas I believe that it should actually be calculated with respect to "k3*Iarc_600_min".

If someone, who has already looked into the standard or willing to look into it now, comment on my understanding, it will be very useful.

Regards,
Balaji Prabhakaran (MIET) | Senior Power Systems Engineer
British Power International


Last edited by wbd on Sat Jan 19, 2019 5:38 am, edited 1 time in total.
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 Post subject: Re: IEEE 1584-2018 - Annex D
PostPosted: Sun Jan 20, 2019 3:48 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
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Location: Scottsdale, Arizona
The 2018 Edition of IEEE 1584 has quite a bit there. Nothing like the 2002 Edition.

D.101 is equation 6 from 4.6 of the standard.
D.104 is equation 10 from 4.7 of the standard.

I hope that helps clarify a bit.

Best Regards,
Jim


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 Post subject: Re: IEEE 1584-2018 - Annex D
PostPosted: Tue Jan 22, 2019 3:37 am 
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Joined: Fri Jan 18, 2019 11:47 am
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Hello Jim,

Thanks very much for your response.

However, 4.6 mentions about a general equation '(6)' that must be used for both intermediate and minimum 'E' calculation. However, '(D.101)' is specific to calculating minimum 'E' and hence you will notice 'K13*log(Iarc_min)' used in '(D.101)' in the place of 'K13*lg*Iarc' in equation '(6)'. Therefore, I still believe that it should actually be calculated with respect to "k3*Iarc_600_min".

Please comment/clarify.

Regards,
Balaji Prabhakaran (MIET) | Senior Power Systems Engineer
British Power International

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Balaji


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