whycliffrussell
Electrical
- Jul 10, 2006
- 92
I'm doing an arc flash study, and according to ETAP if I delay the LSIG settings and increase the pickup time on a GE AK-50 (1600A frame) breaker the arc flash will increase - the converse is true if I turn down both of the settings...
Somehow this does not seem correct to me? ie: The CPT of the breaker is still the same regardless of it's setting therefore wouldn't the arc flash still be the same? ie: The charging spring that opens the breaker still exerts the same force on the contacts and therefore it still takes the same amount of time to open the breaker...energy is proportional to contact parting time!
Can someone point me in a direction to clarify this? Does IEEE 1584-2000/2002 say anything about this?
Somehow this does not seem correct to me? ie: The CPT of the breaker is still the same regardless of it's setting therefore wouldn't the arc flash still be the same? ie: The charging spring that opens the breaker still exerts the same force on the contacts and therefore it still takes the same amount of time to open the breaker...energy is proportional to contact parting time!
Can someone point me in a direction to clarify this? Does IEEE 1584-2000/2002 say anything about this?