GENERAL
 Assumptions & references:
1. Fault MVA corresponding to 40kA is approximately 450 MVA. Hence 450 MVA is
considered as base MVA for calculation purpose.
2. Transformer impedance is considered with 10% negative tolerance
 Result:
1. Manual Calculation
Fault at 6.6kV Bus: 19.01 kA
Fault at 415V Bus: 42.07 kA
2. ETAP
Fault at 6.6kV Bus: 18.50 kA
Fault at 415V Bus: 43.10kA
 Conclusion:
Both Manual & ETAP results are within the design fault level of 40kA for 1 sec at 6.6kV &
50 kA for 1 sec at 415 (433V)