Short circuit asymmetrical factor
Short circuit asymmetrical factor
(OP)
Do I need to consider the calculated short circuit asymmetrical factor in case of arc fault in a MV system?
For bolted faults I already need to provide a zero crossing delay for safe breaker opening.
Thanks.
For bolted faults I already need to provide a zero crossing delay for safe breaker opening.
Thanks.





RE: Short circuit asymmetrical factor
Arcing fault have a lot of resistance (the arc), so the X/R ratio is generally low. This results in low dc offset current.
But no one can really answer your question without more information.
RE: Short circuit asymmetrical factor
match the correct interrupting capacity of the breaker in case of bolted fault. The confirmation of lower X/R ratio (that implies low asymetrical factor) in case of arc fault by IEEE would permit a fast detection and a faster breaker actuation.
Am I correct?
RE: Short circuit asymmetrical factor