Single Phase Arc Flash
Single Phase Arc Flash
(OP)
Hello,
I have been asked to do an arc flash study on a small single phase system, a 75 kVA transformer, 1 phase, 240VAC. ETAP uses three phase for arc flash. If I do the study using 3 phase, the fault currents will be smaller, because a single phase 75kVA will produce greater fault currents than a 3 phase. Any ideas on how to get this accurate?
EE
I have been asked to do an arc flash study on a small single phase system, a 75 kVA transformer, 1 phase, 240VAC. ETAP uses three phase for arc flash. If I do the study using 3 phase, the fault currents will be smaller, because a single phase 75kVA will produce greater fault currents than a 3 phase. Any ideas on how to get this accurate?
EE





RE: Single Phase Arc Flash
As there are no single phase empirical formulas provided in IEEE Std 1584, the three phase empirical formulas can (and are) used as a conservative estimate (using the single phase arcing fault current and clearing times)
RE: Single Phase Arc Flash
RE: Single Phase Arc Flash