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Engineering ToolBox > Three Phase Power Equations

Electrical 3-phase equations

Some common three phase power equations can be expressed as

Real Power

W_applied = 3^1/2 U I PF / 1000 (1)

where

W_applied = real power (Kilowatts)

U = voltage (volts)

I = current (Amps)

PF = power factor - 0.7 - 0.95

Total Power

W = 3^1/2 U I / 1000 (2)

Break Horsepower

W_BHP = 3^1/2 U I PF μ / 746 (3)

where

μ = device efficiency