Transformer Short-Circuit Current and Percentage Impedance Calculation
Transformer full-load current is determined by its rated kVA and operating voltage. The percentage impedance (%Z) is used to estimate the prospective short-circuit current at the transformer terminals.
Calculation Formulas
Three-Phase Full-Load Current: I_FL = (kVA × 1,000) / (√3 × V)
Transformer-Terminal Short-Circuit Current: I_SC = I_FL × (100 / %Z)