Three power calculations from single phase and three phase loads
Three-phase power — single-phase + three-phase loads explained (clean, compact & worked examples) Key rules Power adds. Whether a load is single-phase or three-phase, its real power (kW) adds algebraically. A statement like “three-phase load = 90 kW” means total three-phase real power = 90 kW (i.e., 30 kW per phase in a balanced system), not 90 kW per phase. For balanced three-phase loads, you can convert total ↔ per-phase by dividing or multiplying by 3: P phase = P total / 3 P_{\text{phase}} = P_{\text{total}}/3 P total = 3 × P phase P_{\text{total}} = 3 \times P_{\text{phase}} Important formulas Total three-phase real power (line-to-line voltage) P 3φ ( kW ) = 3 V L − L I P F 1000 P_{\text{3φ}}\;(\text{kW})=\dfrac{\sqrt{3}\;V_{L-L}\;I\;PF}{1000} where V L − L V_{L-L} is line-to-line RMS voltage, I I is line current (A), and P F PF is power factor. Total three-phase real power (line-to-neutral / per-phase voltage) P 3φ ( kW...