Power Systems Fundamentals

Core power-systems calculations used daily in utility, industrial, and consulting engineering: three-phase power relationships, per-unit base conversions, symmetrical fault current, voltage drop on feeders, and power factor correction sizing. Each calculator shows a full worked solution referencing IEEE and CEC/NEC-style conventions.

Three-Phase Power Calculator

Solve for real, reactive, and apparent power and power factor from any two known values.

Per-Unit Conversion Calculator

Convert impedance between per-unit bases, or between ohms and per-unit.

Symmetrical Fault Current Calculator

Three-phase bolted fault current at a transformer secondary, from source and transformer impedance.

Voltage Drop Calculator

Percent voltage drop and receiving-end voltage for a feeder or branch circuit.

Power Factor Correction Capacitor Sizing

Required capacitor kVAR and per-phase capacitance to raise power factor to a target value.