brainfiller wrote:
IF saturation was evaluated for the bolted case and it was OK i.e. not much error, then I believe it should also be OK for the lower arcing current which should cause less saturation. The only case I could think of that might be a problem is if the arcing current is close to the instantaneous setting and saturation IS a problem (error) at the bolted current level - it then might be a problem at the arcing current level if it is close the IP setting.
However, for voltages above 15 kV, the calculation procedure is to assume the arcing current is the same as the bolted current.
Maybe my question should have been: Should saturation always be evaluated to validate trip time used in energy calculations?
Said this way, I guess it's hard to answer no, but i'd like to know what you guys think.
Thanks again!