Isc=VLL3×Ztotalcap I sub s c end-sub equals the fraction with numerator cap V sub cap L cap L end-sub and denominator the square root of 3 end-root cross cap Z sub t o t a l end-sub end-fraction (Where VLLcap V sub cap L cap L end-sub is the line-to-line voltage) .
She collected the data:
“We are toast,” she said. “The breaker will explode before it even trips.” short ckt current calculation
The maximum possible current (Peak) is: $$I_{peak} = I_{sym} \times K$$ Isc=VLL3×Ztotalcap I sub s c end-sub equals the
The calculations above yield the . However, breakers must be rated for the Asymmetrical Current (the instantaneous peak). However, breakers must be rated for the Asymmetrical
If a circuit can produce 20,000A during a fault, but your breaker is only rated for 10,000A, the breaker could melt or arc over without actually stopping the current.
The further away a fault is from the transformer or generator, the lower the current (because the wire itself adds impedance).