Going through old posts related to arc flash, I came across thread238-161138 a statement that If fault arcs are assumed to be resistive then the maximum power occurs when the arc resistance matches the source resistance. How about purely inductive source? Here, arcing resistance would have to be...
I am trying to calculate pressures developed by electrical fault. I 've come across formula published in http://ecmweb.com/mag/electric_putting_arcflash_calculations/ from Ralph Lee's paper, "Pressures Developed by Arcs":
Pounds/ft^2=(11.5×kA arc)÷(distance from arc in feet)^0.9
There are also...
As a follow up to archived thread962-92738 "Following Errors in Computations", please check www.arcadvisor.com for error propagation analysis in action. Online short circuit calculator is offered in effort to satisfy the need for a convenient, comprehensive method of calculating 3-phase...
Would be interesting to know what transmission utilities are doing about legacy arc flash issues relating to old switchboards that have long fault clearance times due to grading with downstream protection and simple protection schemes such as no bus zone or differential protection.
