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balajisuguna

Post subject: IEEE 15842018  Annex D Posted: Fri Jan 18, 2019 12:04 pm 

Joined: Fri Jan 18, 2019 11:47 am Posts: 2

Hello all,
I have a specific question in context to the new IEEE 15842018  IEEE Guide for Performing ArcFlash Hazard Calculationsâ€™ 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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Jim Phillips (brainfiller)

Post subject: Re: IEEE 15842018  Annex D Posted: Sun Jan 20, 2019 3:48 pm 

Plasma Level 

Joined: Mon Sep 17, 2007 5:00 pm Posts: 1504 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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balajisuguna

Post subject: Re: IEEE 15842018  Annex D Posted: Tue Jan 22, 2019 3:37 am 

Joined: Fri Jan 18, 2019 11:47 am Posts: 2

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
_________________ Let Peace Be! Balaji


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