Arc Flash Calculator

[OCPD]

Hello all,

Does anyone has a good reference recommendation for DC arc flash calculations using the Stokes/Oppenlander calculation. If anyone has a calculator or spreadsheet based on the same method if they can share ?

 

[steve66]

Hello all,

Does anyone has a good reference recommendation for DC arc flash calculations using the Stokes/Oppenlander calculation. If anyone has a calculator or spreadsheet based on the same method if they can share ?

Both ETAP and Eaton have software for calculating DC arc flashes, but I'm sure its fairly expensive.

I don't have a spreadsheet or calculator, but it looks like all the necessary information to create one is listed here:

http://www.ecmag.com/section/safety/know-your-arc-dc-arc-flash-calculations

I'm not sure how you would get Excel to do an iterative solution, but it should be possible.

 

[GoldDigger]

Both ETAP and Eaton have software for calculating DC arc flashes, but I'm sure its fairly expensive.

I don't have a spreadsheet or calculator, but it looks like all the necessary information to create one is listed here:

http://www.ecmag.com/section/safety/know-your-arc-dc-arc-flash-calculations

I'm not sure how you would get Excel to do an iterative solution, but it should be possible.

Excel has an advanced feature (solver?) which allows you to set a goal (a measure of good fit of a solution) and then iterate through specified variables to find the best solution.

 

[steve66]

Excel has an advanced feature (solver?) which allows you to set a goal (a measure of good fit of a solution) and then iterate through specified variables to find the best solution.

I don't know how to do that offhand, but here is a spreadsheet that is a start. It does 12 iterations and figures the arc current and resistance. And if given the time for the OCP to trip, it also gives the energy.

I didn't bother entering the "in the box" calculations.