Tools · deterministic engine
Fault level — prospective short-circuit current
Enter the supply transformer and any added series impedance to get a preliminary three-phase fault current (Ik3) and peak. Deterministic from first-principles impedance; the full fault study and device breaking capacities are confirmed by the engineer.
Prospective Ik3
15.16 kA
symmetrical 3-phase rms
Peak (ip)
38.6 kA
κ = 1.8 assumed
Source impedance
16 mΩ
transformer 16 mΩ + added
Preliminary — IEC 60909 simplified. Transformer-source fault level only. It ignores motor contribution, the real network X/R ratio and upstream HV source impedance, and the peak factor κ is an assumption. A competent engineer confirms the fault study with the actual network data and checks device breaking/making capacities before issue.