Calculadora de Potencia Trifásica

Ingresa voltaje, corriente o potencia para calcular todos los parámetros trifásicos. Soporta conexiones estrella y delta con diagrama fasorial SVG interactivo.

Configuration

Line Voltage (V_LL)

Line Current (I_L)

Power Factor (cos φ)

Motor Presets

Results

Active Power (P)

45.93 kW

61.60 HP

Apparent Power (S)

54.04 kVA

Reactive Power (Q)

28.47 kVAR

Phase Voltage (V_ph)

277.1 V

Phase Current (I_ph)

65.00 A

Phase Angle (φ)

31.8°

Power Factor (cos φ)

0.85

Phasor Diagram

Power Triangle

Wiring Diagram

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What is a Three-Phase Power Calculator?

A three-phase power calculator determines the electrical power relationships in three-phase AC systems used in industrial and commercial applications. Three-phase power delivers constant power using three alternating currents offset by 120°, making it more efficient than single-phase for motors, large HVAC systems, and industrial equipment. This calculator handles both Star (Y) and Delta (Δ) configurations, computing active power (kW), apparent power (kVA), reactive power (kVAR), and per-phase voltage and current values.

How to Use the Three-Phase Power Calculator

Select the wiring configuration: Star (Y) or Delta (Δ)
Choose the calculation mode: Calculate Power (forward) or Calculate Current (reverse)
Enter line voltage, line current, and power factor — or use a motor preset
View the results: kW, kVA, kVAR, phase voltage/current, and the power triangle diagram
Use the wiring diagram to verify your Star or Delta connection

Frequently Asked Questions

What is the difference between Star (Y) and Delta (Δ) connections?

In a Star (Y) connection, one end of each winding connects to a common neutral point. Line voltage = √3 × phase voltage, and line current = phase current. In a Delta (Δ) connection, windings form a closed loop. Line voltage = phase voltage, and line current = √3 × phase current. Star connections are common for distribution; Delta for motors.

What is the three-phase power formula?

Active power P = √3 × V_LL × I_L × cos(φ) watts, where V_LL is line-to-line voltage, I_L is line current, and cos(φ) is the power factor. This formula works for both Star and Delta configurations when using line values.

What is power factor and why does it matter?

Power factor (cos φ) is the ratio of active power (kW) to apparent power (kVA). A power factor of 1.0 means all power does useful work. Motors typically have a power factor of 0.8-0.9 lagging. Low power factor means higher current draw for the same useful power, increasing losses and electricity costs.

How do I convert HP to kW?

1 mechanical horsepower = 0.7457 kW. A 10 HP motor outputs 7.457 kW of shaft power. To find the input electrical power, divide by motor efficiency: Input kW = HP × 0.7457 / efficiency.

What is the difference between kW, kVA, and kVAR?

kW (kilowatts) is active/real power that does useful work. kVA (kilovolt-amperes) is apparent power — the total power drawn from the supply. kVAR (kilovolt-amperes reactive) is reactive power stored and released by inductors/capacitors. They form a right triangle: kVA² = kW² + kVAR².