Short Circuit Calculator
Calculate short circuit current, fault levels, and protection requirements for electrical systems. Understand voltage, impedance, and transformer parameters.
Step 1: System Parameters
Understanding Transformer Impedance
Transformer impedance (typically 3-10%) limits short circuit current. Lower impedance means higher fault current. Standard values are 5-6% for distribution transformers.
Step 2: Circuit Parameters
About Cable Impedance
Cable impedance increases with length and decreases with cross-sectional area. Copper cables have lower impedance than aluminum. Longer cables reduce short circuit current at the load end.
Short Circuit Results
Prospective Short Circuit Current
Fault Current Comparison
| Transformer Size | Voltage | Impedance | Fault Current | Fault Level |
|---|
Impedance Breakdown Analysis
Short Circuit Formula
I_sc = V / (Z_transformer + Z_cable)
The short circuit current is calculated by dividing the system voltage by the total impedance (transformer impedance plus cable impedance). Impedance values are typically expressed as percentages or ohms.
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