Arc-Flash calculation

Arc Flash is a complex phenomenon and it gets more complicated and intense beccause the power source is DC. Your best bet is to use Software such as SKM Arc Flash Analysis, which should give very accurate results.

Charlie Kandallu

To do this type of calculation you will have to provide more information. What is the protective device upstream of the 54VDC bus? What are its TCC?

Without doing much in terms of work and calculations your bus can only produce 64kW which is not a lot in itself, however if the arcing fault was allowed to remain over expended periods the energies produced could be significant

Miniscule or not, don't take a chance. Take a look at these videos. They are unbelievable. they actually used a wrench or screwdrive to initiate these arc flashes.

http://www.westexinc.com/flash_video/westex.html

The internal impedance of the battery will predominantly determine the amount of fault current that flows. You can either get this from the battery manufacturer, or else you could get a handle on it by doing some tests of your own. You could measure the voltage drop (very small dV) as you increase the battery load (big change in current dI). The ratio of dV/dI will give you the battery's internal resistance. The fault current will then be your 54Volts / Rinternal, which you should then use for design of fuses (or other protection gear), and would be rated for that fault level in kVA.

To be a little more accurate, you could include the resistance of your busbars with the battery's internal resistance.