trójfazowy • Watts • Moc

Oblicz moc dla trójfazowego

Oblicz power from voltage, current and power factor cos φ.

trójfazowy • Watts • Moc

Oblicz power from voltage, current and power factor cos φ.

Wartości obliczeń

Uwaga: To obliczenie jest technicznie poprawnym uproszczeniem typowym dla kalkulatorów online. Przy doborze praktycznym trzeba również sprawdzić normy, sposób ułożenia, temperaturę, grupowanie, zabezpieczenia, typ kabla i dane producenta.

Zastosowany wzór

P = √3 × U × I × cos φ

P is the real power in watts, U the line-to-line voltage in volts, I the current in amps and cos φ the power factor.

Practical guidance

Understand three-phase power from current and voltage

This calculator finds the active power of a balanced three-phase load from line voltage, line current and power factor.

Input values explained

Prąd: Enter the expected operating current, not a fuse rating. Motors and electronic power supplies may draw much higher starting or peak currents.
Napięcie: Enter the line-to-line voltage between two phases. This is commonly 400 V in low-voltage systems; 230 V is not the correct input here.
Moc factor cos φ: cos φ is the ratio of active to apparent power. It is close to 1 for resistive heating loads; use the data-sheet value for motors and transformers.

Example: 16 A at 400 V

A three-phase motor draws 16 A per line at 400 V and has a power factor of 0.90.

P = √3 × 400 V × 16 A × 0.90 = 9,976 W

The active input power is about 9.98 kW. Without the power factor, the apparent power would be about 11.09 kVA.

Interpret active power correctly

The result is electrical active power for a balanced load. It does not give mechanical output, efficiency or starting current.

Calculation limits

Measure and assess each phase separately when the load is unbalanced.
Cable and protective-device design also requires starting behaviour and installation conditions.